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Members

QuantOM is open to every researchers working in the field of quantitative methods for management, logistics and operations management.
See the core members page for more details.

Scientific Production

A subset of recent works published by QuantOM members is available through the institutional depository ORBi:
Starting date:
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Papers - Books - Working Papers - Conferences

Papers in Journals


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See detailStochastic Inventory Routing for Perishable Products
Crama, Yves; Rezaei Sadrabadi, Mahmood; Savelsbergh, Martin; Van Woensel, Tom

in Transportation Science (in press)

Different solution methods are developed to solve an inventory routing problem for a perishable product with stochastic demands. The solution methods are compared empirically in terms of average profi...

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See detailA multifractal formalism for non-concave and non-increasing spectra: the leaders profile method
Esser, Céline; Kleyntssens, Thomas; Nicolay, Samuel

in Applied & Computational Harmonic Analysis (in press)

We present an implementation of a multifractal formalism based on the types of histogram of wavelet leaders. This method yields non-concave spectra and is not limited to their increasing part. We show...

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See detailAnalysis of definitions of General Practice/Family Medicine and Primary Health Care
Jamoulle, Marc; Resnick, Melissa; Ittoo, Ashwin; Cardillo, Elena; Vander Stichele, Robert; Vanmeerbeek, Marc

in British Journal of General Practice (2017), 0050

Abstract Background There are numerous definitions of General Practice and Family Medicine (GP/FM) and Primary Health Care (PHC), but the distinction between the two concepts is unclear. Aim To conduc...

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See detailEarly Detection of University Students with Potential Difficulties
Hoffait, Anne-Sophie; Schyns, Michael

in Decision Support Systems (2017), 101

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. Academic failure is a relevant is...

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See detailMIP-based constructive heuristics for the three-dimensional Bin Packing Problem with transportation constraints
Paquay, Célia; Limbourg, Sabine; Schyns, Michael; Oliveira, José Fernando

in International Journal of Production Research (2017)

This article is about seeking a good feasible solution in a reasonable amount of computation time to the three-dimensional Multiple Bin Size Bin Packing Problem (MBSBPP). The MBSBPP studied considers ...

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See detailAccounting for Price Endogeneity in Airline Itinerary Choice Models: An Application to Continental U.S. Markets
Lurkin, Virginie; Garrow, Laurie; Higgins, Matthew; Newman, Jeffrey; Schyns, Michael

in Transportation Research. Part A : Policy & Practice (2017), 100

Network planning models, which forecast the profitability of airline schedules, support many critical decisions, including equipment purchase decisions. Network planning models include an itinerary ch...

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See detailA Machine Learning-Based Approximation of Strong Branching
Marcos Alvarez, Alejandro; Louveaux, Quentin; Wehenkel, Louis

in INFORMS Journal on Computing (2017), 29(1), 185-195

We present in this paper a new generic approach to variable branching in branch-and-bound for mixed- integer linear problems. Our approach consists in imitating the decisions taken by a good branching...

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See detailA class of valid inequalities for multilinear 0-1 optimization problems
Crama, Yves; Rodriguez Heck, Elisabeth

in Discrete Optimization (2017), 25

This paper investigates the polytope associated with the classical standard linearization technique for the unconstrained optimization of multilinear polynomials in 0-1 variables. A new class of valid...

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See detailA robust statistical approach to select adequate error distributions for financial returns
Hambuckers, julien; Heuchenne, Cédric

in Journal of Applied Statistics (2017), 44(1), 137-161

In this article, we propose a robust statistical approach to select an appropriate error distribution, in a classical multiplicative heteroscedastic model. In a first step, unlike to the traditional a...

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See detailIntermodal network design: a three-mode bi-objective model applied to the case of Belgium
Mostert, Martine; Caris, An; Limbourg, Sabine

in Flexible Services and Manufacturing Journal (2017)

Freight transport planning is nowadays encouraged to align with environmental objectives. Among those, climate change is of particular interest for many countries. In its White Paper on Transport, the...

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See detailRoad and intermodal transport performance: the impact of operational costs and air pollution external costs
Mostert, Martine; Caris, An; Limbourg, Sabine

in Research in Transportation Business & Management (2017)

The transportation of goods is essential for the economy, but it also contributes to air pollution which, in turn, affects human health. These negative impacts generate additional costs for society th...

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See detailThe three-dimensional rectangular Multiple Bin Size Bin Packing Problem with transportation constraints: A case study in the field of air transportation
Paquay, Célia

in 4OR : Quarterly Journal of the Belgian, French and Italian Operations Research Societies (2017)

Ph. D Thesis summary see other reference on ORBI...

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See detailRobust asymptotic tests for the equality of multivariate coefficients of variation
Aerts, Stéphanie; Haesbroeck, Gentiane

in TEST (2017), 26(1), 163-187

In order to easily compare several populations on the basis of more than one feature, multivariate coefficients of variation (MCV) may be used as they allow to summarize relative dispersion in a singl...

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See detailMars Topography Investigated Through the Wavelet Leaders Method: a Multidimensional Study of its Fractal Structure
Deliège, Adrien; Kleyntssens, Thomas; Nicolay, Samuel

in Planetary and Space Science (2017), 136C

This work examines the scaling properties of Mars topography through a wavelet-based formalism. We conduct exhaustive one-dimensional (both longitudinal and latitudinal) and two-dimensional studies ba...

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See detailGuided Dive for the Spatial Branch-and-Bound
Gerard, Damien; Koeppe, Matthias; Louveaux, Quentin

in Journal of Global Optimization (2017)

We study the spatial Brand-and-Bound algorithm for the global opti- mization of nonlinear problems. In particular we are interested in a method to find quickly good feasible solutions. Most spatial Br...

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See detailExact algorithms for the Equitable Traveling Salesman Problem
Kinable, Joris; Smeulders, Bart; Delcour, Eline; Spieksma, Frits C.R.

in European Journal of Operational Research (2017)

Given a weighted graph G = (V,E), the Equitable Traveling Salesman Problem (ETSP) asks for two perfect matchings in G such that (1) the two matchings together form a Hamiltonian cycle in G and (2) the...

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See detailHow can seed removal rates of zoochoric tree species be assessed quickly and accurately?
Hambuckers, julien; Dauvrin, Alice; Trolliet, Franck; Evrard, Quentin; Forget, Pierre-Michel; Hambuckers, Alain

in Forest Ecology and Management (2017), 403

The quantification of seed dispersal and predation processes has been gaining increased importance in the assessment of forest responses to anthropogenic disturbance, but also in developing an underst...

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See detailThe inventory-routing problem of returnable transport items with time windows and simultaneous pickup and delivery in closed-loop supply chains
Iassinovskaia, Galina; Limbourg, Sabine; RIANE, Fouad

in International Journal of Production Economics (2017), (183), 570-582

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners ...

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See detailIntegrating production scheduling and vehicle routing decisions at the operational decision level: A review and discussion
Moons, Stef; Ramaekers, Katrien; Caris, An; Arda, Yasemin

in Computers & Industrial Engineering (2017), 104

Production scheduling and vehicle routing are two well-studied problems in literature. Although these supply chain functions are interrelated, they are often solved sequentially. This uncoordinated ap...

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See detailIntegration of order picking and vehicle routing in a B2C e-commerce context
Moons, Stef; Ramaekers, Katrien; Caris, An; Arda, Yasemin

in Flexible Services and Manufacturing Journal (2017)

E-commerce sales are increasing every year and customers who buy goods on the Internet have high service level expectations. In order to meet these expectations, a company’s logistics operations nee...

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See detailA Quantitative Doignon-Bell-Scarf theorem
Aliev, Iskander; Bassett, Robert; De Loera, Jesus; Louveaux, Quentin

in Combinatorica (2017)

The famous Doignon-Bell-Scarf theorem is a Helly-type result about the existence of integer solutions to systems of linear inequalities. The purpose of this paper is to present the following quantitat...

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See detailQuadratic reformulations of nonlinear binary optimization problems
Anthony, Martin; Boros, Endre; Crama, Yves; Gruber, Aritanan

in Mathematical Programming (2017), 162

Very large nonlinear unconstrained binary optimization problems arise in a broad array of applications. Several exact or heuristic techniques have proved quite successful for solving many of these pro...

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See detailIterated local search for the capacitated vehicle routing problem with sequence-based pallet loading and axle weight constraints
Pollaris, Hanne; Braekers, Kris; Caris, An; Janssens, Gerrit, K.; Limbourg, Sabine

in Networks (2017)

In this article an Iterated Local Search algorithm for the capacitated vehicle routing problem with sequence-based pallet loading and axle weight constraints is presented. Axle weight limits impose a ...

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See detailLarge neighborhood search for multi-trip vehicle routing
François, Véronique; Arda, Yasemin; Crama, Yves; Laporte, Gilbert

in European Journal of Operational Research (2016), 255(2), 422-441

We consider the multi-trip vehicle routing problem, in which each vehicle can perform several routes during the same working shift to serve a set of customers. The problem arises when customers are cl...

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See detailRevealed preference tests of collectively rational consumption behavior: formulations and algorithms
Talla Nobibon, Fabrice; Cherchye, Laurens; Crama, Yves; Demuynck, Thomas; De Rock, Bram; Spieksma, Frits C.R.

in Operations Research (2016), 64(6), 11971216

This paper focuses on revealed preference tests of the collective model of household consumption. We start by showing that the decision problems corresponding to testing collective rationality are {\s...

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See detailStatistically Bundled Shewhart Control Charts for Monitoring Delivery Chains Systems
Foster, Earnest; Faraz, Alireza; Heuchenne, Cédric

in European Journal of Industrial Engineering (2016)

Continuous monitoring of Delivery Time variables by means of control charts in a delivery chain is a very recent application of Statistical Process Control (SPC) to the service sector. The aim of the ...

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See detailEstimating the out-of-sample predictive ability of trading rules: a robust bootstrap approach
Hambuckers, julien; Heuchenne, Cédric

in Journal of Forecasting (2016), 35(4), 347-372

In this paper, we provide a novel way to estimate the out-of-sample predictive ability of a trading rule. Usually, this ability is estimated using a sample splitting scheme, true out-of-sample data be...

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See detailText analytics in industry: Challenges, desiderata and trends
Ittoo, Ashwin; Nguyen, Le Minh; van den Bosch, Antal

in Computers in Industry (2016), (78),

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See detailEditorial: Special issue on natural language processing and text analytics in industry
Ittoo, Ashwin; Nguyen, Le Min; van den Bosch, Antal

in Computers in Industry (2016)

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See detailSpecial issue on natural language processing and text analytics in industry
Ittoo, Ashwin; Nguyen, Le Minh; van den Bosch, Antal

in Computers in Industry (2016), 78

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See detailA Mixed Integer Programming formulation for the three dimensional bin packing problem deriving from an air cargo application
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

in International Transactions in Operational Research (2016), 23(1-2), 187-213

The present paper looks into the problem of optimising the loading of boxes into containers. The goal is to minimise the unused volume. This type of problem belongs to the family of Multiple Bin Size ...

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See detailExternal Costs as Competitiveness Factors for Freight Transport — A State of the Art
Mostert, Martine; Limbourg, Sabine

in Transport Reviews (2016), 36(6), 692-712

External costs have been a key issue in the last years of transport research. In Europe, this trend is in line with the political willingness to internalize externalities in transport pricing policies...

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See detailBi-objective Road and Pipe Network Design for Crude Oil Transport in the Sfax Region in Tunisia
Belaid, Emna; Limbourg, Sabine; Mostert, Martine; Rigo, Philippe; Cools, Mario

in Procedia Engineering (2016), 142

In this paper, we examine a bi-objective road and pipe network design for crude oil transport in the Sfax region in Tunisia. In particular, we search for the minimum spanning trees (MST) that connect ...

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See detailA Statistically adaptive sampling policy to the Hotelling's T2 Control Chart: Markov Chain Approach
Seif, A.; Faraz, Alireza; Heuchenne, Cédric; Saniga, E.

in Communications in Statistics : Theory and Methods (2016)

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See detailThe Robust Economic Statistical Design of the Hotelling’s T^2 Chart
Faraz, Alireza; Chalaki, Kamyar; Saniga, Erwin; Heuchenne, Cédric

in Communications in Statistics : Theory and Methods (2016)

Economic statistical designs aim at minimizing the cost of process monitoring when a specific scenario or a set of estimated process and cost parameters is given. However, in practical situations the ...

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See detailModeling in Air Transportation: Cargo Loading and Itinerary Choice
Lurkin, Virginie

in 4OR : Quarterly Journal of the Belgian, French and Italian Operations Research Societies (2016)

This is a summary of the author's PhD thesis supervised by Michael Schyns and defended on April 29, 2016 at the University of Li\`ege, Belgium. We examine two problems as part of this dissertation. Th...

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See detailDistribution under elliptical symmetry of a distance-based multivariate coefficient of variation
Aerts, Stéphanie; Haesbroeck, Gentiane; Ruwet, Christel

in Statistical Papers (2016)

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See detailDSIMA: A testbed for the quantitative analysis of interaction models within distribution networks
Mathieu, Sébastien; Louveaux, Quentin; Ernst, Damien; Cornélusse, Bertrand

in Sustainable Energy, Grids and Networks (2016), 5

This article proposes an open-source testbed to simulate interaction models governing the exchange of flexibility services located within a distribution network. The testbed is an agent-based system i...

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See detailBox search for the data mining of the key parameters of an industrial process
Louveaux, Quentin; Mathei, Axel; Mathieu, Sébastien

in Intelligent Data Analysis (2016), 20(6),

To increase their competitiveness, many industrial companies monitor their production process, collecting large amount of measurements. This paper describes a technique using this data to improve the ...

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See detailConditional portfolio allocation: Does aggregate market liquidity matter?
Bazgour, Tarik; Heuchenne, Cédric; Sougné, Danielle

in Journal of Empirical Finance (2016), 35

This paper investigates how aggregate liquidity influences optimal portfolio allocations across various US characteristic portfolios. We consider short-term allocation problems, with single and multip...

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See detailLogistics Service Quality: The Case of Da Nang City
Limbourg, Sabine; Giang, Ho Thi Quynh; Cools, Mario

in Procedia Engineering (2016), 142

Cost minimization is a key objective in managing logistics services. In this context, a growing interest in quality improvement can be observed. However, service quality is hard to quantify as it is a...

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See detailQuadratization of symmetric pseudo-Boolean functions
Anthony, Martin; Boros, Endre; Crama, Yves; Gruber, Aritanan

in Discrete Applied Mathematics (2016), 203

A pseudo-Boolean function is a real-valued function $f(x)=f(x_1,x_2,\ldots,x_n)$ of $n$ binary variables; that is, a mapping from $\{0,1\}^n$ to ${\bbr}$. For a pseudo-Boolean function $f(x)$ on $\{0,...

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See detailCapacitated vehicle routing problem with sequence- based pallet loading and axle weight constraints
Pollaris, Hanne; Braekers, Kris; Caris, An; Janssens, Gerrit K.; Limbourg, Sabine

in EURO Journal on Transportation and Logistics (2016)

In this paper, we introduce and study the capacitated vehicle routing problem with sequence-based pallet loading and axle weight constraints. To the best of our knowledge, it is the first time that ax...

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See detailMultivariate coefficients of variation: Comparison and influence functions
Aerts, Stéphanie; Haesbroeck, Gentiane; Ruwet, Christel

in Journal of Multivariate Analysis (2015), 142

In the univariate setting, coefficients of variation are well-known and used to compare the variability of populations characterized by variables expressed in different units or having really differ...

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See detailAn Ant Colony System for Responsive Dynamic Vehicle Routing
Schyns, Michael

in European Journal of Operational Research (2015), 245(3), 704-718

We present an algorithm based on an Ant Colony System to deal with a broad range of Dynamic Capacitated Vehicle Routing Problems with Time Windows, (partial) Split Delivery and Heterogeneous fleets (D...

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See detailThe Airline Container Loading Problem with Pickup and Delivery
Lurkin, Virginie; Schyns, Michael

in European Journal of Operational Research (2015), 244(3), 955-965

This paper considers the loading optimization problem for a set of containers and pallets transported into a cargo aircraft that serves multiple airports. Because of pickup and delivery operations tha...

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See detailEvaluation of the Economic Statistical Design of the Multivariate T2 Control Chart with Multiple Variable Sampling Intervals Scheme: NSGA-II Approach
Faraz, Alireza; Seif, Asghar; Sadeghifar

in Journal of Statistical Computation & Simulation (2015), 85(12), 2442-2455

The economic and statistical merits of a multiple variable sampling intervals (MVSI) scheme are studied. The problem is formulated as a double-objective optimization problem with the adjusted average ...

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See detailThe strength of multi-row models
Louveaux, Quentin; Poirrier, Laurent; Salvagnin, Domenico

in Mathematical Programming Computation (2015), 7(2), 113-148

We develop a method for computing facet-defining valid inequalities for any mixed-integer set PJ. Our practical implementation does not return only facet- defining inequalities, but it is able to find...

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See detailValid inequalities for the single arc design problem with set-ups
Agra, Agostinho; Doostmohammadi, Mahdi; Louveaux, Quentin

in Discrete Optimization (2015), 16

We consider a mixed integer set which generalizes two well-known sets: the single node fixed- charge network set and the single arc design set. Such set arises as a relaxation of feasible sets of gene...

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See detailMulti-period stochastic optimization problems in transportation management (Ph. D. Thesis Summary)
Pironet, Thierry

in 4OR : Quarterly Journal of the Belgian, French and Italian Operations Research Societies (2015), 13(1), 113-114

Ph. D Thesis summary see other reference on ORBI...

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See detailGuaranteed Conditional Performance of the S2 Control Chart with Estimated Parameters
Faraz, Alireza; Heuchenne, Cédric; Woodall, William

in International Journal of Production Research (2015)

We evaluate the in-control performance of the S2 control chart with estimated parameters conditional on the Phase I sample. Simulation results indicate no realistic amount of Phase I data is enough to...

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See detailThe impact of transport policies on railroad intermodal freight competitiveness – The case of Belgium
Santos, Bruno F.; Limbourg, Sabine; Carreira, Joana Silva

in Transportation Research. Part D : Transport and Environment (2015), 34

This paper discusses the impact of three freight transport policies aiming to promote railroad intermodal transport in Europe, and examines the case of Belgium as a testing ground. These policies cons...

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See detailShewhart Control Charts for Monitoring Reliability with Weibull Lifetimes
Faraz, Alireza; Saniga, Erwin; Heuchenne, Cédric

in Quality and Reliability Engineering International (2015), 31

In this paper, we present Shewhart type Z ̅ and S2 control charts for monitoring individual or joint shifts in the scale and shape parameters of a Weibull distributed process. The advantage of this m...

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See detailA note on testing axioms of revealed preference
Nobibon, F. Talla; Smeulders, Bart; Spieksma, F. C. R.

in Journal of Optimization Theory & Applications (2015), 166(3), 1063-1070

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See detailTransitive preferences in multi-member households
Smeulders, Bart; Cherchye, Laurens; De Rock, B.; Spieksma, F. C. R.; Talla Nobibon, F.

in Economic Theory Bulletin (2015), 3

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See detailComplexity results for the Weak Axiom of Revealed Preference for collective consumption models
Smeulders, Bart; Cherchye, L.; De Rock, B.; Spieksma, F. C. R.; Talla Nobibon, F.

in Journal of Mathematical Economics (2015), 58

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See detailEstimation of the error distribution in a semiparametric transformation model.
Heuchenne, Cédric; Samb, Rawane; Van Keilegom, Ingrid

in Electronic Journal of Statistics (2015), 9

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See detailEstimation of the error density in a semiparametric transformation model
Colling, Benjamin; Heuchenne, Cédric; Samb, Rawane; Van Keilegom, Ingrid

in Annals of the Institute of Statistical Mathematics (2015), 67

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See detailVehicle routing problems with loading constraints: State-of-the-art and future directions
Pollaris, Hanne; Braekers, Kris; Caris, An; Janssens, Gerrit K.; Limbourg, Sabine

in OR Spectrum (2015), 37(Issue 2), 297-330

Distributors are faced with loading constraints in their route planning, e.g.,multi-dimensional packing constraints, unloading sequence constraints, stability constraints and axle weight limits. Ignor...

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See detailControl Charts monitoring product’s loss to society
Celano, Giovanni; Faraz, Alireza; Saniga, Erwin

in Quality and Reliability Engineering International (2014), 30(8), 1393-1407

Taguchi introduced a new philosophy in quality control that accounts for the economic loss associated to process variation measured by deviations from the target value of a product quality characteris...

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See detailStatistical performance of a control chart monitoring the ratio of two normal variables
Celano, Giovanni; CASTAGLIOLA, Philippe; Faraz, Alireza; Fichera, S.

in Quality and Reliability Engineering International (2014), 30(8), 1361-1377

On-line Statistical Process Control (SPC) monitoring the ratio Z of two normal variables X and Y has surprisingly received too little attention in the quality control literature. Several potential app...

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See detailEconomic Statistical Design of the VP( X) ̅ Control Charts for Monitoring a Process under Non-normality
Seif, Asghar; Faraz, Alireza; Saniga, Erwin

in International Journal of Production Research (2014), 53(14), 4218-4230

Recent studies proved that variable parameters (VP) X ̅ control charts not only detects process mean shifts quicker than the classical X ̅ control chart but also has better economic properties. Furt...

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See detailMulti-period vehicle loading with stochastic release dates
Arda, Yasemin; Crama, Yves; Kronus, David; Pironet, Thierry; Van Hentenryck, Pascal

in EURO Journal on Transportation and Logistics (2014), 3(2), 93-119

This paper investigates a multi-period vehicle loading problem with stochastic information regarding the release dates of items to be transported. The deterministic version of the problem can be formu...

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See detailThe variable parameters T2 chart with run rules
Faraz, Alireza; Celano, Giovanni; Heuchenne, Cédric; Saniga, Erwin; Fichera, S.

in Statistical Papers (2014), 55(4), 933-950

The Hotelling’s T2 control chart with variable parameters (VP T2) has been shown to have better statistical performance than other adaptive control schemes in detecting small to moderate process mea...

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See detailInteger Programs with Prescribed Number of Solutions and a Weighted Version of Doignon-Bell-Scarf’s Theorem
Aliev, Iskander; De Loera, Jesus; Louveaux, Quentin

in Lecture Notes in Computer Science (2014)

In this paper we study a generalization of the classical fesibility problem in integer linear programming, where an ILP needs to have a prescribed number of solutions to be considered solved. We first...

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See detailSpecial Issue on Natural Language Processing and Information Systems
Bouma, Gosse; Ittoo, Ashwin; Basile, Valerio; Metais, Elisabeth; Wortmann, Hans

in Data & Knowledge Engineering (2014), 90

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See detailA learning procedure for sampling semantically different valid expressions
St-Pierre, David Lupien; Maes, Francis; Ernst, Damien; Louveaux, Quentin

in International Journal of Artificial Intelligence (2014), 12(1), 18-35

A large number of problems can be formalized as finding the best symbolic expression to maximize a given numerical objective. Most approaches to approximately solve such problems rely on random explor...

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See detailAn algorithm for the separation of two-row cuts
Louveaux, Quentin; Poirrier, Laurent

in Mathematical Programming (2014), 143(1-2), 111-146

We consider the question of finding deep cuts from a model with two rows of the type PI = {(x,s) ∈ Z2 ×Rn+ : x = f +Rs}. To do that, we show how to reduce the complexity of setting up the polar of ...

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See detailLikelihood based inference for semi-competing risks
Heuchenne, Cédric; Laurent, Stéphane; Legrand, Catherine; Van Keilegom, Ingrid

in Communications in Statistics : Simulation and Computation (2014), 43(5), 1112-1132

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See detailDouble Objective Economic Statistical Design of the VPT2 Control Chart: Wald’s identity approach
Faraz, Alireza; Heuchenne, Cédric; Saniga, Erwin; Costa, Antonio F.B.

in Journal of Statistical Computation & Simulation (2014), 84

Recent studies have shown that applying the control chart by using a variable parameters (VP) scheme yields more rapid detection of assignable causes than the classical method of taking fixed sample s...

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See detailA combinatorial branch-and-bound algorithm for box search
Mathieu, Sébastien; Louveaux, Quentin

in Discrete Optimization (2014), 13

Considering a set of points in a multi-dimensional space with an associated real value for each point, we want to find the box with the maximum sum of the values of the included points. This problem h...

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See detailGoodness of fit measures for revealed preference tests: complexity results and algorithms
Smeulders, Bart; Spieksma, F. C. R.; Cherchye, L.; De Rock, B.

in ACM Transactions on Economics and Computation (2014), 2(1), 3

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See detailNatural Language Processing and Information Systems
Bouma, Gosse; Ittoo, Ashwin; Basile, Valerio; Metais, Elisabeth; Wortmann, Hans

in Data & Knowledge Engineering (2014)

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See detailMulti-Dimensional Vector Assignment Problems
Dokka, Trivikram; Crama, Yves; Spieksma, Frits C.R.

in Discrete Optimization (2014), 14

We consider a special class of axial multi-dimensional assignment problems called multi- dimensional vector assignment (MVA) problems. An instance of the MVA problem is defined by m disjoint sets, eac...

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See detailIntegration of inland waterway transport in the intermodal supply chain: a taxonomy of research challenges
Caris, An; Limbourg, Sabine; Macharis, Cathy; van Lier, Tom; Cools, Mario

in Journal of Transport Geography (2014), 41

This paper identifies research opportunities which will enable the further integration of inland waterway transport in the intermodal supply chain. Intermodal transport may be interpreted as a chain o...

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See detailCrisis management: Lessons learnt from BP Deepwater Horizon Spill Oil
de Wolf, Daniel

in Business Management and Strategy (2013), 4(1), 69-90

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See detailDesign and dimensioning of hydrogen transmission pipeline networks
de Wolf, Daniel

in European Journal of Operational Research (2013), 229(1), 239-251

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See detailMonitoring delivery chains using multivariate control charts
Faraz, Alireza; Heuchenne, Cédric; Saniga, Erwin; Foster, Earnest

in European Journal of Operational Research (2013), 228(1), 282289

Delivery chains are concerned with the delivery of goods and services to customers within a specific time interval; this time constraint is added to the usual consumer demand for product or service qu...

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See detailTerm extraction from sparse, ungrammatical domain-specific documents
Ittoo, Ashwin; Bouma, Gosse

in Expert Systems with Applications (2013), 40(7), 2530-2540

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See detailMultiobjective Genetic Algorithm Approach to the Economic Statistical Design of Control Charts with an application to Xbar and S2 charts
Faraz, Alireza; Saniga, Erwin

in Quality and Reliability Engineering International (2013), 29(3), 407-415

Control charts are the primary tools of statistical process control. These charts may be designed by using a simple rule suggested by Shewhart, by a statistical criterion, an economic criterion or a j...

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See detailCrisis communication failures: The BP Case Study
de Wolf, Daniel

in International Journal of Advances in Management and Economics (2013), 2(2), 48-56

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See detailVershik’s intermediate level standardness criterion and the scale of an automorphism
Laurent, Stéphane

in Lecture Notes in Mathematics (2013)

Vershik’s standardness criterion takes a particular form of combinatorial nature in the case of $r_n$-adic filtrations, which we call Vershik’s intermediate level criterion in this paper. This cri...

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See detailRobust optimization for resource-constrained project scheduling with uncertain activity durations
Artigues, Christian; Leus, Roel; Talla Nobibon, Fabrice

in Flexible Services and Manufacturing Journal (2013), 25(1-2),

The purpose of this paper is to propose models for project scheduling when there is considerable uncertainty in the activity durations, to the extent that the decision maker cannot with confidence ass...

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See detailPower indices and the measurement of control in corporate structures
Crama, Yves; Leruth, Luc

in International Game Theory Review (2013), 15

This paper proposes a brief review of the use of power indices in the corporate governance literature. Without losing sight of the field of application, it places the emphasis on the game-theoretic as...

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See detailMin max generalization for deterministic batch mode reinforcement learning: relaxation schemes
Fonteneau, Raphaël; Ernst, Damien; Boigelot, Bernard; Louveaux, Quentin

in SIAM Journal on Control & Optimization (2013), 51(5), 33553385

We study the min max optimization problem introduced in Fonteneau et al. [Towards min max reinforcement learning, ICAART 2010, Springer, Heidelberg, 2011, pp. 61–77] for computing policies for batch...

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See detailThe Money Pump as a Measure of Revealed Preference Violations: A Comment
Smeulders, Bart; Cherchye, Laurens; De Rock, B.; Spieksma, F. C. R.

in Journal of Political Economy (2013), 121(6), 1248-1258

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See detailInvestigation of advanced materials for fusion alpha particle diagnostics
Bonheure, G.; Van Wassenhove, G.; Hult, M.; González de Orduña, R.; Strivay, David; Vermaercke, P.; Delvigne, T.; Chene, Grégoire; Delhalle, René; Huber, A.; Schweer, B.; Esser, G.; Biel, W.; Neubauer, O.

in Fusion Engineering & Design (2013)

Fusion alpha particle diagnostics for ITER remain a challenging task. Standard escaping alpha particle detectors in present tokamaks are not applicable to ITER and techniques suitable for fusion react...

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See detailPenalized Pro led Semiparametric Estimating Functions
Wang, Lan; Kai, Bo; Heuchenne, Cédric; Tsai, Chih-Ling

in Electronic Journal of Statistics (2013), 7

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See detailOptimal T2 control chart with double sampling scheme - an alternative to the MEWMA chart
Faraz, Alireza; Heuchenne, Cédric; Saniga, Erwin

in Quality and Reliability Engineering International (2012), 28(7), 751-760

Recent studies have shown that the double sampling (DS) scheme yields rapid detection of out of control situations, but the economic consequences of applying the proposed method are not discussed in t...

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See detailA leader-follower game in competitive facility location
Kucukaydin, Hande; Aras, Necati; Altinel, I. Kuban

in Computers & Operations Research (2012), 39(2), 437-448

We address the problem of locating new facilities of a firm or franchise that enters a market where a competitor operates existing facilities. The goal of the new entrant firm is to decide the locatio...

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See detailOn the advantages of economically designed the Hotelling’s T2 control chart with variable sample sizes and sampling intervals
Faraz, Alireza; kazemzadeh, R. B.; Parsian, Ahmad; Moghadam, M. B.

in Quality & Quantity (2012), 46(1), 39-53

Faraz and Parsian (Statistical Paper, 47: 569–593, 2006) have shown that the double warning lines (DWL) scheme detects process shifts more quickly than the other variable ratio sampling schemes such...

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See detailAutomatic Aircraft Load Planning
Limbourg, Sabine; Schyns, Michael; Laporte, Gilbert

in Journal of the Operational Research Society (2012), 63

The goal of this paper is the development of a new mixed integer linear program designed for optimally loading a set of containers and pallets into a compartmentalised cargo aircraft. It is based on r...

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See detailA Meta Model to Optimally Design the VSI T2 Control Chart
Faraz, Alireza; Seif, A.

in international Journal of Applied Operational Research (2012), 1(3), 53-69

Recent studies have shown that the variable sampling interval (VSI) scheme helps practitioners to detect process shifts more quickly than the classical scheme (FRS). In this paper, the economically an...

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See detailCiftduzeyli Bir Rekabetci Tesis Yer Secimi Problemi Icin Tabu Arama Sezgiseli
Kucukaydin, Hande; Aras, Necati; Altinel, I. Kuban

in Endustri Muhendisligi Dergisi (2012), 23(1), 28-39

In this study, the problem of a firm is considered where the firm tries to open new facilities in a market where there are already existing facilities belonging to a competitor. The new entrant firm w...

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See detailA heuristic method to schedule training programs for Small and Medium Enterprises
Rezaei Sadrabadi, Mahmood; Shamsaei, Fahimeh; Mohammadian, Iman; van Vyve, Mathieu

in European Journal of Operational Research (2012), 217

During the life period of Small and Medium Enterprises (SMEs) in incubators they need some training programs to acquire the required knowledge in order to survive and succeed in the business environme...

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See detailScale checks in censored regression
Heuchenne, Cédric; Dette, Holger

in Scandinavian Journal of Statistics (2012), 39

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See detailTesting for one-sided alternatives in nonparametric censored regression
Heuchenne, Cédric; Pardo Fernandez, Juan-Carlos

in TEST (2012), 21(3), 498-518

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See detailThe interval ordering problem
Durr, Christophe; Queyranne, Maurice; Spieksma, Frits C.R.; Talla Nobibon, Fabrice; Woeginger, Gerhard J.

in Discrete Applied Mathematics (2012)

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See detailStatistical Merits and Economic Evaluation of T2 Control Charts with the VSSC Scheme
Seif, Asghar; Moghadam, M.B.; Faraz, Alireza; Heuchenne, Cédric

in Arabian Journal for Science and Engineering (2011), 36(7), 1461-1470

T2 control charts are used to monitor a process when more than one quality variable associated with the process is being observed. Recent studies have shown that using variable sampling size (VSS) sch...

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See detailA modified economic-statistical design of the T2 control chart with variable sample sizes and control limits
Seif, A.; Faraz, Alireza; Heuchenne, Cédric; Saniga, E.; Moghadam, M. B.

in Journal of Applied Statistics (2011), 38(11), 2459-2469

Recent studies have shown that using variable sampling size and control limits (VSSC) schemes result in charts with more statistical power than variable sampling size (VSS) when detecting small to mod...

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See detailA unification and some corrections to Markov chain approaches to develop variable ratio sampling scheme control charts
Faraz, Alireza; Saniga, Erwin

in Statistical Papers (2011), 52(4), 799-811

We provide some unifying definitions, make some corrections to articles by Faraz and Parsian (J Stat Pap 47:569–593, 2006) and Costa (JQual Technol 26:155– 163, 1994; 29:197–204, 1997), and usin...

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See detailSplit rank of triangle and quadrilateral inequalities
Dey, Santanu; Louveaux, Quentin

in Mathematics of Operations Research (2011), 36(3), 432-461

A simple relaxation of two rows of a simplex tableau is a mixed integer set consisting of two equations with two free integer variables and non-negative continuous variables. Recently Andersen et al. ...

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See detailOn the properties of the hotelling’s T2 control chart with variable sampling intervals
Faraz, Alireza; Chalaki, Kamyar; Moghadam, M. B.

in Quality & Quantity (2011), 45(3), 579-586

When T 2 control chart is used to monitor a process, it is usually assumed that the samples of size n0 is taken at constant intervals t0 . In this paper, we investigate the T 2 control chart for monit...

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See detailEconomic Statistical Design of a T2 Control Chart with Double Warning Lines
Faraz, Alireza; Saniga, Erwin

in Quality and Reliability Engineering International (2011), 27(2), 125-139

Recent studies have shown that enhancing the common T2 control chart by using variable sample sizes (VSS) and variable sample intervals (VSI) sampling policies with a double warning line scheme (DWL) ...

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See detailIdentification of the linear parts of nonlinear systems for fuzzy modeling
Rezaei Sadrabadi, Mahmood

in Applied Soft Computing (2011), 11

In direct approach to fuzzy modeling, structure identification is one of the most critical tasks. In modeling the nonlinear system, this fact is more crucial. In this paper, a new hybrid method is pro...

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See detailA Bayesian framework for the ratio of two Poisson rates in the context of vaccine efficacy trials
Laurent, Stéphane; Legrand, Catherine

in ESAIM: Probability and Statistics = Probabilité et statistique : P & S (2011)

In many applications, we assume that two random observations x and y are generated according to independent Poisson distributions and we are interested in performing statistical inference on the ratio...

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See detailFacility location via fuzzy modeling and simulation
Rezaei Sadrabadi, Mahmood; Fazel Zarandi, M. H.

in Applied Soft Computing (2011), 11(8), 5330-5340

This paper presents a continuous facility location model with fuzzy methodology. The developments concern mainly to some drawbacks in the initial model which takes it far from being used in practice. ...

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See detailA discrete competitive facility location model with variable attractiveness
Kucukaydin, Hande; Aras, Necati; Altinel, I. Kuban

in Journal of the Operational Research Society (2011), 62(9), 1726-1741

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant firm to compete against already existing facilities tha...

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See detailCompetitive facility location problem with attractiveness adjustment of the follower: A bilevel programming model and its solution
Kucukaydin, Hande; Aras, Necati; Altinel, I. Kuban

in European Journal of Operational Research (2011), 208(3), 206-220

We are concerned with a problem in which a firm or franchise enters a market by locating new facilities where there are existing facilities belonging to a competitor. The firm aims at finding the loca...

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See detailColoring Graphs Using Two Colors while Avoiding Monochromatic Cycles
Talla Nobibon, Fabrice; Hurkens, Cor A. J.; Leus, Roel; Spieksma, Frits

in INFORMS Journal on Computing (2011)

We consider the problem of deciding whether a given directed graph can be vertex partitioned into two acyclic subgraphs. Applications of this problem include testing rationality of collective consumpt...

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See detailImproving Product Quality and Reliability with Customer Experience Data
Brombacher, Aarnout; Hopma, Eva; Ittoo, Ashwin; Lu, Yuan; Luyk, Ilse; Maruster, Laura; Ribeiro, Joel; Weijters, Ton; Wortmann, Hans

in Quality and Reliability Engineering International (2011), 28(8), 873886

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See detailThe Mathematics of Peter L. Hammer (1936-2006): Graphs, Optimization, and Boolean Models
Boros, Endre; Crama, Yves; de Werra, Dominique; Hansen, Pierre; Maffray, Frédéric; Simeone, Bruno

in Annals of Operations Research (2011), 188

This volume contains a collection of papers published in memory of Peter L. Hammer (1936-2006). Peter Hammer made substantial contributions to several areas of operations research and discrete mathema...

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See detailLogical Analysis of Data: Classification with justification
Boros, Endre; Crama, Yves; Hammer, Peter L.; Ibaraki, Toshihide; Kogan, Alexander; Makino, Kazuhisa

in Annals of Operations Research (2011), 188

Learning from examples is a frequently arising challenge, with a large number of algorithms proposed in the classification, data mining and machine learning literature. The evaluation of the quality o...

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See detailEconomic and Economical Statistical Design of Hotelling’s T2 Control Chart with Two-State Adaptive Sample Size
Faraz, Alireza; Saniga, Erwin; kazemzadeh, R. B.

in Journal of Statistical Computation & Simulation (2010), 80(12), 12991316

The Hotelling’s T 2 control chart, a direct analogue of the univariate Shewhart ¯X chart, is perhaps the most commonly used tool in industry for simultaneous monitoring of several quality character...

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See detailECONOMICALLY DESIGNED HOTELLING’S T2 CONTROL CHART USING VSICL SCHEME
torabian, Mohsen; Moghadam, M. B.; Faraz, Alireza

in Arabian Journal for Science & Engineering (2010), 35(2), 251263

The Hotelling’s T2 control chart, is the most widely used multivariate procedure for two or more related quality characteristics, but it’s power lacks the desired performance in detecting small to...

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See detailAn application of fuzzy random variables to control charts
Faraz, Alireza; Shapirob, Arnold

in Fuzzy Sets & Systems (2010), 161(20), 26842694

The two most significant sources of uncertainty are randomness and incomplete information. In real systems, we wish to monitor processes in the presence of these two kinds of uncertainty. This paper a...

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See detailSpace and time allocation in a shipyard assembly hall
Bay, Maud; Crama, Yves; Langer, Yves; Rigo, Philippe

in Annals of Operations Research (2010), 179(1), 57-76

We present a space and time allocation problem that arises in assembly halls producing large building blocks (namely, a shipyard which assembles prefabricated keel elements). The building blocks are v...

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See detailConstructing a fuzzy Shewhart control chart for variables when uncertainty and randomness are combined
Faraz, Alireza; Kazemzadeh, R. B.; Moghadam, M. B.; BAZDAR, A.

in Quality & Quantity (2010), 44(5), 905-914

In this paper we introduce a fuzzy chart for variables which is used in situations when uncertainty and randomness are combined. It is showed that the Shewhart chart’s control limits must be adjuste...

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See detailMixed-integer sets from two rows of two adjacent simplex bases
Andersen, Kent; Louveaux, Quentin; Weismantel, Robert

in Mathematical Programming (2010), 124(1-2), 455-480

In 2007 we studied a mixed-integer set arising from two rows of a simplex tableau. We showed that facets of such a set can be obtained from lattice point free triangles and quadrilaterals associated w...

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See detailThroughput optimization in two-machine flowshops with flexible operations
Crama, Yves; Gultekin, Hakan

in Journal of Scheduling (2010), 13(3), 227-243

In this study, a two-machine flowshop producing identical parts is considered. Each of the identical parts is assumed to require a number of manufacturing operations, and the machines are assumed to b...

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See detailRelaxMCD: smooth optimisation for the Minimum Covariance Determinant estimator
Schyns, Michael; Haesbroeck, Gentiane; Critchley, Frank

in Computational Statistics & Data Analysis (2010), 54(4), 843-857

The Minimum Covariance Determinant (MCD) estimator is a highly robust procedure for estimating the center and shape of a high dimensional data set. It consists of determining a subsample of h points o...

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See detail« Market area of intermodal rail-road container terminals embedded in a hub-and–spoke network
Limbourg, Sabine; Jourquin, Bart

in Papers in Regional Science (2010), 89(1), 135154

This paper presents a methodology able to compare road and rail-road intermodal market areas that takes the network structures, the operation costs and the location of the rail-road terminals into acc...

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See detailAn analysis of mixed integer linear sets based on lattice point free convex sets
Andersen, Kent; Louveaux, Quentin; Weismantel, Robert

in Mathematics of Operations Research (2010), 35(1), 233-256

The set obtained by adding all cuts whose validity follows from a maximal lattice free polyhedron with max-facet-width at most w is called the w th split closure. We show the w th split closure is a p...

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See detailA relaxed approach to combinatorial problems in robustness and diagnostics
Critchley, Frank; Schyns, Michael; Haesbroeck, Gentiane; Fauconnier, Cécile; Lu, Guobing; Atkinson, Richard A; Wang, Dong Quian

in Statistics and Computing (2010), 20(1), 99-115

A range of procedures in both robustness and diagnostics require optimisation of a target functional over all subsamples of given size. Whereas such combinatorial problems are extremely difficult to s...

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See detailOptimal selection of a portfolio of options under Value-at-Risk constraints: a scenario approach
Schyns, Michael; Crama, Yves; Hübner, Georges

in Annals of Operations Research (2010), 181

This paper introduces a multiperiod model for the optimal selection of a financial portfolio of options linked to a single index. The objective of the model is to maximize the expected return of the p...

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See detailOn Vershikian and I-cosy random variables and filtrations
Laurent, Stéphane

in Teoriya Veroyatnostei i ee Primeneniya (2010), 55

We prove that the equivalence between Vershik’s standardness criterion and the I-cosiness criterion for a filtration in discrete, negative time, holds separately for each random variable. This gives...

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See detailOn standardness and I-cosiness
Laurent, Stéphane

in Séminaire de Probabilités (2010), XLIII

The object of study of this work is the invariant characteristics of filtrations in discrete, negative time, pioneered by Vershik. We prove the equivalence between I-cosiness and standardness without ...

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See detailFurther comments on the representation problem for stationary processes
Laurent, Stéphane

in Statistics & Probability Letters (2010), 80

We comment on some points about the coding of stochastic processes by sequences of independent random variables. The most interesting question has to do with the standardness property of the filtratio...

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See detailThe Optimal Design of the VSI T2 Control Chart
Faraz, Alireza; Kazemzadeh, R. B.; Heuchenne, Cédric; Saniga, Erwin

in Journal of Iranian Statistical Society (2010), 9(1), 1-19

Recent studies have shown that the variable sampling interval (VSI) scheme helps practitioners detect process shifts more quickly than the classical scheme (FRS). In this paper, the economically and s...

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See detailA robust heuristic for the optimal selection of a portfolio of stocks
Schyns, Michael

in International Journal of Operational Research (2010), 9(3), 258-271

This paper introduces a new optimization heuristic for the robustification of critical inputs under consideration in many problems. It is shown that it allows to improve significantly the quality and ...

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See detailStatistical process control and delivery chains
Faraz, Alireza; Kazemzadeh, R.B.

in International Journal of Industrial Engineering & Production Research (2010), 21(3), 55-66

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See detailAntibubble lifetime: influence of the bulk viscosity and of the surface modulus of the mixture
Dorbolo, Stéphane; Delhalle, René; Dujardin, Julien; Vandewalle, Nicolas; Denkov, Nikola; Terwagne, Denis; Huet, Nicolas

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2010)

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See detailGoodness-of-fit tests for the error distribution in nonparametric regression
Heuchenne, Cédric; Van Keilegom, Ingrid

in Computational Statistics & Data Analysis (2010), 54

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See detailEstimation in nonparametric location-scale regression models with censored data
Heuchenne, Cédric; Van Keilegom, Ingrid

in Annals of the Institute of Statistical Mathematics (2010), 62

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See detailHotelling’s T 2 control chart with two adaptive sample sizes
Faraz, Alireza; Moghadam, M. B.

in Quality & Quantity (2009), 43

Some quality control schemes have been developed when several related quality characteristics are to be monitored. The familiar multivariate process monitoring and control procedure is the Hotelling...

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See detailImproving the power of out of control states detection in multivariate processes using variable sampling intervals policy
Seif, A.; Faraz, Alireza; Torabian, M.

in Journal of Applied Mathematics (2009), 23

The familiar multivariate process monitoring and control procedure is the Hotelling’s T2 control chart, a direct analog of the univariate shewhart chart. But, its efficiency for detecting small to m...

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See detailStatistical design of the Hotelling’s T2 control chart with variable ratio sampling scheme using genetic algorithms
Torabian, M.; Faraz, Alireza; Seif, A.

in Journal of Applied Mathematics (2009), 6(22), 77-89

The familiar multivariate process monitoring and control procedure is the Hotelling’s T2 control chart, a direct analog of the univariate shewhart chart. But, its efficiency for detecting small to m...

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See detailHotelling’s T2 control chart with two adaptive sample sizes
Faraz, Alireza; Moghadam, M. B.

in Quality & Quantity (2009), 43(6), 903-913

Some quality control schemes have been developed when several related quality characteristics are to be monitored. The familiar multivariate process monitoring and control procedure is the Hotelling...

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See detailOptimal rail-road container terminal locations on the European network
Limbourg, Sabine; Jourquin, Bart

in Transportation Research. Part E: Logistics and Transportation Review (2009), 45(4), 551-563

The European transport policy has focused on sustainable transport solutions, among which intermodal transport is a key player. However, its efficiency is strongly dependent on the location of the con...

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See detailCertificates of linear mixed integer infeasibility
Andersen, Kent; Louveaux, Quentin; Weismantel, Robert

in Operations Research Letters (2008), 36(6), 734-738

We derive a certificate of integral infeasibility for linear systems with equations and inequalities by generating algebraically an outer description of a lattice point free polyhedron that contains t...

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See detailInventory control in a decentralised two-stage make-to-stock queueing system
Arda, Yasemin; Hennet, Jean-Claude

in International Journal of Systems Science (2008), 39(7),

In an Enterprise network, several companies interact to produce families of goods. Each member company seeks to optimise his own production and inventory policy to maximise his profit. These objective...

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See detailPolyhedral properties for the intersection of two knapsacks
Louveaux, Quentin; Weismantel, Robert

in Mathematical Programming (2008), 113(1), 15-37

We address the question to what extent polyhedral knowledge about individual knapsack constraints suffices or lacks to describe the convex hull of the binary solutions to their intersection. It turns ...

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See detailIntermediate integer programming representations using value disjunctions
Köppe, Matthias; Louveaux, Quentin; Weismantel, Robert

in Discrete Optimization (2008), 5(2), 293-313

We introduce a general technique to create an extended formulation of a mixed-integer program. We classify the integer variables into blocks, each of which generates a finite set of vector values. The...

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See detailA new method to fuzzy modeling and its application in performance evaluation of tenants in incubators
Rezaei Sadrabadi, Mahmood

in International Journal of Advanced Manufacturing Technology (2008), 37

As we know fuzzy modeling is one of the most powerful techniques to extract experts’ knowledge in the form of fuzzy if-then rules. In this research work, a new method to fuzzy modeling is proposed i...

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See detailStrong uniform consistency results of the weighted average of conditional artificial data points
Heuchenne, Cédric

in Journal of Statistical Planning & Inference (2008), 138(5), 1496-1515

In this paper, we study strong uniform consistency of a weighted average of artificial data points. This is especially useful when information is incomplete (censored data, missing data ...). In this ...

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See detailSupply chain coordination: A game-theory approach
Hennet, Jean-Claude; Arda, Yasemin

in Engineering Applications of Artificial Intelligence (2008), 21

In a supply chain organized as a network of autonomous enterprises, the main objective of each partner is to optimize his production and supply policy with respect to his own economic criterion. Confl...

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See detailPractical methods for measuring and managing operational risk in the financial sector: A clinical study
Chapelle, Ariane; Crama, Yves; Hübner, Georges; Peters, Jean-Philippe

in Journal of Banking and Finance (2008), 32

This paper analyzes the implications of the Advanced Measurement Approach (AMA) for the assessment of operational risk. Through a clinical case study on a matrix of two selected business lines and two...

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See detailGeršgorin variations III: On a theme of Brualdi and Varga
Boros, Endre; Brualdi, Richard; Crama, Yves; Hoffman, Alan

in Journal of Linear Algebra and its Applications (2008), 428

Brualdi brought to Geršgorin Theory the concept that the digraph G(A) of a matrix A is important in studying whether A is singular. He proved, for example, that if, for every directed cycle of G(A), ...

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See detailCounting and enumerating aggregate classifiers
Adem, Jan; Crama, Yves; Gochet, Willy; Spieksma, Frits C.R.

in Discrete Applied Mathematics (2008), 156(3), 2459-2468

We propose a generic model for the "weighted voting" aggregation step performed by several methods in supervised classification. Further, we construct an algorithm to count the number of dis...

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See detailThe tool switching problem revisited
Crama, Yves; Moonen, Linda S; Spieksma, Frits CR; Talloen, Ellen

in European Journal of Operational Research (2007), 182(2), 952-957

In this note we study the tool switching problem with non-uniform tool sizes. More specifically, we consider the problem where the job sequence is given as part of the input. We show that the resultin...

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See detailInequalities from two rows of the simplex tableau
Andersen, Kent; Louveaux, Quentin; Weismantel, Robert; Wolsey, Laurence A.

in Lecture Notes in Computer Science (2007)

In this paper we explore the geometry of the integer points in a cone rooted at a rational point. This basic geometric object allows us to establish some links between lattice point free bodies and th...

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See detailControl and voting power in corporate networks: Concepts and computational aspects
Crama, Yves; Leruth, Luc

in European Journal of Operational Research (2007), 178(3), 879-893

This paper proposes to rely on power indices to measure the amount of control held by individual shareholders in corporate networks. The value of the indices is determined by a complex voting game vie...

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See detailPeter Ladislaw Hammer (1936-2006)
Boros, Endre; Crama, Yves; Simeone, Bruno

in 4OR : Quarterly Journal of the Belgian, French and Italian Operations Research Societies (2007), 5(1), 1-4

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See detailMultiplicity and complexity issues in contemporary production scheduling
Brauner, Nadia; Crama, Yves; Grigoriev, Alexander; van de Klundert, Joris

in Statistica Neerlandica (2007), 61(1), 75-91

High multiplicity scheduling problems arise naturally in contemporary production settings where manufacturers combine economies of scale with high product variety. Despite their frequent occurrence in...

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See detailFuzzy Control Chart A Better Alternative for Shewhart Average Chart
Faraz, Alireza; MOGHADAM, M. B.

in Quality & Quantity (2007), 41(3), 375-385

This paper through a real illustrative example and a power test shows that designing a fuzzy control chart for process average of a continuous (variable) quality characteristic with a warning line is ...

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See detailLifting, Superadditivity, Mixed Integer Rounding and Single Node Flow Sets Revisited
Louveaux, Quentin; Wolsey, Laurence A.

in Annals of Operations Research (2007), 153(1), 47-77

In this survey we attempt to give a unified presentation of a variety of results on the lifting of valid inequalities, as well as a standard procedure com- bining mixed integer rounding with lifting f...

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See detailNonlinear regression with censored data
Heuchenne, Cédric; Van Keilegom, Ingrid

in Technometrics (2007), 49(1), 34-44

Suppose that the random vector (X, Y) satisfies the regression model Y = m(X) + sigma(X)epsilon, where m(.) = E(Y vertical bar.) belongs to some parametric class (m(theta)(.):theta is an element of Th...

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See detailPolynomial regression with censored data based on preliminary nonparametric estimation.
Heuchenne, Cédric; Van Keilegom, Ingrid

in Annals of the Institute of Statistical Mathematics (2007), 59

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See detailLocation estimation in nonparametric regression with censored data
Heuchenne, Cédric; Van Keilegom, Ingrid

in Journal Of Multivariate Analysis (2007), 98(8), 1558-1582

Consider the heteroscedastic model Y =m (X) +sigma(X)epsilon, where epsilon and X are independent, Y is subject to right censoring, m (center dot) is an unknown but smooth location function (like e.g....

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See detailPolynomial regression with censored data based on preliminary nonparametric estimation
Heuchenne, Cédric; Van Keilegom, Ingrid

in Annals of the Institute of Statistical Mathematics (2007), 59(2), 273-297

Consider the polynomial regression model Y = (beta)0 + beta(1) X + center dot center dot center dot beta X-p(p) + sigma (X)epsilon, where sigma(2)(X) = Var(Y vertical bar X) is unknown, and epsilon is...

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See detailUne procédure d’affectation multi-flux et multimodale appliquée aux réseaux transeuropéens de transport de fret
Jourquin, Bart; Limbourg, Sabine

in Les Cahiers Scientifiques du Transports (2007), 52

Les modèles multimodaux de fret so ellement basés sur le modèle à quatre étapes dans lequel la génération, la distribution, la répartition modale et l’affectation sont autant de modules sép...

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See detailRail-Road terminal locations: aggregation errors and best potential locations on large networks
Limbourg, Sabine; Jourquin, Bart

in European Journal of Transport and Infrastructure Research (2007), 7(4), 317-334

In network location problems, the number of potential locations is often too large in order to find a solution in a reasonable computing time. That is why aggregation techniques are often used to redu...

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See detailEquilibrium traffic assignment on large Virtual Networks: Implementation issues and limits for multi-modal freight transport
Jourquin; Limbourg, Sabine

in European Journal of Transport and Infrastructure Research (2006), 6(3), 205-228

Multi-Modal freight models are traditionally built following the well known “four steps model” in which generation, distribution, modal-split and assignment are seen as separated modules. An alter...

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See detailHotelling's T 2 control chart with double warning lines
Faraz, Alireza; Parsian, Ahmad

in Statistical Papers (2006), 47(4), 569-593

Recent studies have shown that the T 2 control chart with variable sampling intervals (VSI) and/or variable sample sizes (VSS) detects process shitis faster than the traditional T 2 chart. This articl...

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See detailInventory control in a multi-supplier system
Arda, Yasemin; Hennet, Jean-Claude

in International Journal of Production Economics (2006), 104

An enterprise network is analyzed from the viewpoint of an end-product manufacturer who receives customer orders and organises his production and supply policy so as to minimize the sum of his average...

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See detailOptimization of Surface Utilization Using Heuristic Approaches
Langer, Yves; Bay, Maud; Crama, Yves; Bair, Frédéric; Caprace, Jean-David; Rigo, Philippe

in Ship Technology Research = Schiffstechnik (2005), 52(3), 141-147

We present a scheduling problem that arises in factories producing large building blocks. This is a three dimensional bin-packing problem with two spatial dimensions and a time dimension. We propose a...

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See detailA framework for the complexity of high-multiplicity scheduling problems
Brauner, Nadia; Crama, Yves; Grigoriev, Alexander; van de Klundert, Joris

in Journal of Combinatorial Optimization (2005), 9(3), 313-323

The purpose of this note is to propose a complexity framework for the analysis of high multiplicity scheduling problems. Part of this framework relies on earlier work aiming at the definition of outpu...

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See detailConsensus algorithms for the generation of all maximal bicliques
Alexe, Gabriela; Alexe, Sorin; Crama, Yves; Foldes, Stephan; Hammer, Peter L.; Simeone, Bruno

in Discrete Applied Mathematics (2004), 145(1 Sp. Iss. SI), 11-21

We describe a new algorithm for generating all maximal bicliques (i.e. complete bipartite. not necessarily induced subgraphs) of a graph. The algorithm is inspired by, and is quite similar to. the con...

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See detailOptimal procurement decisions in the presence of total quantity discounts and alternative product recipes
Crama, Yves; Pascual, R.; Torres, A.

in European Journal of Operational Research (2004), 159(2), 364-378

We describe the purchasing decisions faced by a multi-plant company. The suppliers of this company offer complex discount schedules based on the total quantity (rather than cost) of ingredients purcha...

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See detailThe maximum deviation just-in-time scheduling problem
Brauner, Nadia; Crama, Yves

in Discrete Applied Mathematics (2004), 134(1-3), 25-50

This note revisits the maximum deviation just-in-time (MDJIT) scheduling problem previously investigated by Steiner and Yeomans. Its main result is a set of algebraic necessary and sufficient conditio...

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See detailA two-stage stochastic programming framework for transportation planning in disaster response
Barbarosoglu, Gulay; Arda, Yasemin

in Journal of the Operational Research Society (2004), 55

This study proposes a two-stage stochastic programming model to plan the transportation of vital first-aid commodities to disaster-affected areas during emergency response. A multi-commodity, multi-mo...

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See detailExtended formulations for Gomory Corner polyhedra
Köppe, Matthias; Louveaux, Quentin; Weismantel, Robert; Wolsey, Laurence A.

in Discrete Optimization (2004), 1(2), 141-165

We present several types of extended formulations for integer programs, based on irreducible integer solutions to Gomory’s group relaxations. We present algorithmic schemes based on an iterative ref...

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See detailSimulated annealing for complex portfolio selection problems
Crama, Yves; Schyns, Michael

in European Journal of Operational Research (2003), 150(3), 546-571

This paper describes the application of a simulated annealing approach to the solution of a complex portfolio selection model. The model is a mixed integer quadratic programming problem which arises w...

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See detailLifting, Superadditivity, Mixed Integer Rounding and Single Node Flow Sets Revisited
Louveaux, Quentin; Wolsey, Laurence A.

in 4OR : Quarterly Journal of the Belgian, French and Italian Operations Research Societies (2003), 1

In this survey we attempt to give a unified presentation of a variety of results on the lifting of valid inequalities, as well as a standard procedure combining mixed integer rounding with lifting for...

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See detailInvestigation of the range and effective factors on protein energy malnutrition based on nutritional classification of rural zone of Arak in children less than five years
Jafarinia; Faraz, Alireza; Akhoundzadeh, Sh.; Gahgaei, Z.

in Arak Medical University Journal (2003), 6(2(23)), 7-13

Introduction: The protein-energy malnutrition is the most prevalent cause of malnutrition and always occures in infants and children under 5 years old. According to the harmful effects of malnutrition...

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See detailApproximation algorithms for the design of SDH/SONET networks
Brauner, Nadia; Crama, Yves; Finke, Gerd; Lemaire, Pierre; Wynants, Christelle

in RAIRO : Operations Research = Recherche Opérationnelle (2003), 37(4, OCT-DEC), 235-247

In this paper, a graph partitioning problem that arises in the design of SONET/SDH networks is defined and formalized. Approximation algorithms with performance guarantees are presented. To solve this...

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See detailProduction planning problems in printed circuit board assembly
Crama, Yves; van de Klundert, Joris; Spieksma, Frits CR

in Discrete Applied Mathematics (2002), 123(1-3), 339-361

This survey describes some of the main optimization problems arising in the context of production planning for the assembly of printed circuit boards. The discussion is structured around a hierarchica...

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See detailCombining problem structure and basis reduction to solve a class of hard integer programs
Louveaux, Quentin; Wolsey, Laurence A.

in Mathematics of Operations Research (2002), 27(3), 470-484

We consider a hard integer programming problem that is difficult for the standard branch-and-bound approach even for small instances. A reformulation based on lattice basis reduction is known to be mo...

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See detailCyclic scheduling in robotic flowshops
Crama, Yves; Kats, Vladimir; Van de Klundert, Joris; Levner, Eugene

in Annals of Operations Research (2000), 96

Fully automated production cells consisting of flexible machines and a material handling robot have become commonplace in contemporary manufacturing systems. Much research on scheduling problems arisi...

See detailBoolean normal forms, shellability and reliability computations
Boros, Endre; Crama, Yves; Ekin, Oya; Hammer, Peter L.; Ibaraki, Toshihide; Kogan, Alex

in SIAM Journal on Discrete Mathematics (2000), 13

Orthogonal forms of positive Boolean functions play an important role in reliability theory, since the probability that they take value 1 can be easily computed. However, few classes of disjunctive no...

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See detailWorst-case performance of approximation algorithms for tool management problems
Crama, Yves; Van de Klundert, Joris

in Naval Research Logistics (1999), 46

Since the introduction of flexible manufacturing systems, researchers have investigated various planning and scheduling problems faced by the users of such systems. Several of these problems are not e...

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See detailCyclic scheduling in 3-machine robotic flow shops
Crama, Yves; Van de Klundert, Joris

in Journal of Scheduling (1999), 2

We consider a robotic flow shop model in which a single robot is responsible for the transportation of parts between machines. For reasons of simplicity, when the shop is to produce a large number of ...

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See detailCombinatorial optimization models for production scheduling in automated manufacturing systems
Crama, Yves

in European Journal of Operational Research (1997), 99

Production planning and scheduling models arising in automated manufacturing environments exhibit several features not encountered in models developed for traditional production systems. For instance,...

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See detailHitting or avoiding balls in Euclidean space
Crama, Yves; Ibaraki, Toshihide

in Annals of Operations Research (1997), 69

We investigate the algorithmic complexity of several geometric problems of the following type: given a "feasible" box and a collection of balls in Euclidean space, find a feasible point whic...

See detailThe polytope of block diagonal matrices and complete bipartite partitionings
Crama, Yves; Oosten, Maarten

in Networks (1997), 30

Motivated by a fundamental clustering problem arising in several areas (production management, marketing, numerical analysis, etc.), we investigate the facial structure of the polytope whose extreme p...

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See detailCyclic scheduling of identical parts in a robotic cell
Crama, Yves; Van de Klundert, Joris

in Operations Research (1997), 45

We consider a robotic flowshop in which one type of product is to be repeatedly produced and where transportation of the parts between the machines is performed by the robot. The identical parts cycli...

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See detailVariable and term removal from Boolean formulae
Crama, Yves; Ekin, Oya; Hammer, Peter L.

in Discrete Applied Mathematics (1997), 75

Given a Boolean formula in disjunctive normal form, the variable deletion control set problem consists in finding a minimum cardinality set of variables whose deletion from the formula results in a DN...

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See detailThe assembly of printed circuit boards: A case with multiple machines and multiple board types
Crama, Yves; Flippo, Olaf E.; Van de Klundert, Joris; Spieksma, Frits C.R.

in European Journal of Operational Research (1997), 98

In this paper a typical situation arising in the assembly of printed circuit boards is investigated. The planning problem we face is how to assemble boards of different types using a single line of pl...

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See detailModels for machine-part grouping in cellular manufacturing
Crama, Yves; Oosten, Maarten

in International Journal of Production Research (1996), 34

For cellular manufacturing strategies to succeed, the productive system first has to be divided into highly independent cells. This means that a partition of the machines into machine groups, a partit...

See detailScheduling jobs of equal length: complexity, facets and computational results
Crama, Yves; Spieksma, Frits C.R.

in Mathematical Programming (1996), 72

The following problem was originally motivated by a question arising in the automated assembly of printed circuit boards. Given aren jobs, which have to be performed on a single machine within a fixed...

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See detailThe component retrieval problem in printed circuit board assembly
Crama, Yves; Flippo, Olaf E.; Van de Klundert, Joris; Spieksma, Frits C.R.

in International Journal of Flexible Manufacturing Systems (1996), 8

The minimization of the makespan of a printed circuit board assembly process is a complex problem. Decisions involved in this problem concern the specification of the order in which components are to ...

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See detailValid inequalities and facets for a hypergraph model of the nonlinear knapsack and FMS part-selection problems
Crama, Yves; Mazzola, Joseph B.

in Annals of Operations Research (1995), 58

This paper defines the dense subhypergraph problem (DSP), which provides a modelling framework for the nonlinear knapsack problem and other well-known problems arising in areas such as capital budgeti...

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See detailComplexity of product positioning and ball intersection problems
Crama, Yves; Hansen, Pierre; Jaumard, Brigitte

in Mathematics of Operations Research (1995), 20

The product positioning problem consists in choosing the attributes of a new product in such a way as to maximize its market share, i.e., to attract a maximum number of customers. Mathematically, the ...

See detailA column generation approach to job grouping for flexible manufacturing systems
Crama, Yves; Oerlemans, Alwin G.

in European Journal of Operational Research (1994), 78

A flexible manufacturing system consists of a number of NC-machines, linked by automated material handling devices, that perform the various operations required to manufacture parts. Each operation re...

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See detailOn the strength of relaxations of multidimensional knapsack problems
Crama, Yves; Mazzola, Joseph B.

in INFOR (1994), 32

Branch-and-bound algorithms for integer programming problems typically employ bounds derived from well-known relaxations, such as the Lagrangian, surrogate, or composite relaxations. Although the boun...

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See detailApproximation algorithms for integer covering problems via greedy column generation
Crama, Yves; Van de Klundert, Joris

in RAIRO : Operations Research = Recherche Opérationnelle (1994), 28

Many combinatorial optimization problems can be formulated as covering problems. In some cases, this covering formulation is not polynomial in the input size of the original problem. In order to solve...

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See detailSurface pressure in SOS models
De Coninck, Joël; Limbourg, Sabine; Newman, Charles

in Thin Solid Films (1994), 244

Microscopic models of the solid-on-solid type were considered to describe the surface pressure of monolayers and bilayers on top of another layer in two and three dimensions. The two interfaces, above...

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See detailCause-effect relationships and partially defined Boolean functions
Crama, Yves; Ibaraki, Toshihide

in Annals of Operations Research (1988), 16

This paper investigates the use of Boolean techniques in a systematic study of cause-effect relationships. The model uses partially defined Boolean functions. Procedures are provided to extrapolate fr...




Papers - Books - Working Papers - Conferences

Books and chapters of books


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See detailNatural Language Processing and Information Systems
Frasincar, Flavius; Ittoo, Ashwin; Nguyen, Le Minh; Metais, Elisabeth

Book published by Springer (2017)

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See detailRail-road terminals location with interconnected rail network of West African countries
LIHOUSSOU, Messan; Limbourg, Sabine

in Cools, Mario; Limbourg, Sabine (Eds.) Proceedings of the BIVEC-GIBET Transport Research Days 2017: Towards an Autonomous and Interconnected Transport Future (2017)

From 2006 to 2012, the port of Cotonou improves its performance thanks to the Millennium Challenge Account program, through modernization of port facilities and management systems. But the project not...

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See detailInventory routings problems for the management of Returnable Transportation Items with durability constraints
Pirotte, Myriem; Limbourg, Sabine

in Cools, Mario; Limbourg, Sabine (Eds.) Proceedings of the BIVEC-GIBET Transport Research Days 2017: Towards an Autonomous and Interconnected Transport Future (2017)

RTIs managements are quite diverse. Research efforts are thus needed in the areas of RTI acquisition; warehouse layout, inventory routing problem; production planning and control; tracking and schedul...

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See detailBuilding an Effective Strategy To Supply High Frequency Stores in Emerging Cities
Sabiri, Asmaa; Riane, Fouad; Limbourg, Sabine

in Cools, Mario; Limbourg, Sabine (Eds.) Proceedings of the BIVEC-GIBET Transport Research Days 2017: Towards an Autonomous and Interconnected Transport Future (2017)

Traditional distribution channels that cover nanostores still abound in merging megacities. These traditional retail formats need to be visited and supplied very frequently (High Frequency Stores) whi...

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See detailThe Fleet Size and Mix Vehicle Routing Problem with sequence-based pallet loading and axle weight constraints
Pollaris, Hanne; Braekers, Kris; caris, An; Janssens, Gerrit, K.; Limbourg, Sabine

in Cools, Mario; Limbourg, Sabine (Eds.) Proceedings of the BIVEC-GIBET Transport Research Days 2017: Towards an Autonomous and Interconnected Transport Future (2017)

In this paper, the Fleet Size and Mix Vehicle Routing Problem (FSM) with sequence-based pallet loading and axle weight constraints is introduced. The effect of the integration of axle weight constrain...

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See detailDe nouveaux terminaux à conteneurs en Belgique : hasard ou nécessité ?
Jourquin, Bart; Limbourg, Sabine

in Reflets et perspectives de la vie économique (2017)

En parodiant le titre d’un célèbre essai de Jacques Monod (1971), cet article tente de synthétiser un certain nombre de travaux de recherche qui, ces dernières années, ont examiné la pertinenc...

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See detailInteger Programming and Combinatorial Optimization
Louveaux, Quentin; Skutella, Martin

Book published by Springer (2016)

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See detailPDIRPTW Instances
Limbourg, Sabine

in Iassinovskaia, Galina; Limbourg, Sabine; Riane, Fouad (Eds.) The inventory-routing problem of returnable transport items with time windows and simultaneous pickup and delivery in closed-loop supply chains (2016)

Instances...

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See detailParametric Polyhedra with at least k Lattice Points: Their Semigroup Structure and the k-Frobenius Problem
Aliev, Iskander; De Loera, Jesus; Louveaux, Quentin

in Beveridge, Andrew; Griggs, Jerold; Hogben, Leslie; Musiker, Gregg; Tetali, Prasad (Eds.) Recent trends in Combinatorics (2016)

The well-studied semigroup Sg(A) = {b : b = Ax; x in Z^n; x >= 0} can be stratified by the sizes of the polyhedral fibers IPA(b) = {x : Ax = b; x >= 0; x in Z^n}. The key theme of this paper is ...

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See detailProceedings of the 12th Workshop on Models and Algorithms for Planning and Scheduling Problems
Marchetti-Spaccamela, Alberto; Crama, Yves; Goossens, Dries; Leus, Roel; Schyns, Michael; Spieksma, Frits

Book published by KU Leuven (2015)

This volume contains abstracts of talks presented at the 12th Workshop on Models and Algorithms for Planning and Scheduling Problems (MAPSP 2015), held from June 8 to June 12, 2015, in La Roche-en-Ard...

See detailCharacteristics of Economically Designed CUSUM and \bar{X} Control Charts
Saniga, Erwin; Davis, Darwin; Faraz, Alireza; McWilliams, Thomas; Lucas, James

in Knoth, Sven; Schmid, Wolfgang (Eds.) Frontiers in Statistical Quality Control 11 (2015)

In this paper we investigate the characteristics of economic control chart designs for both Shewhart (¯X ) and CUSUM control charts. Authors in the past have made some suggestions regarding the desig...

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See detailSpecial Issue on Natural Language Processing and Text Analytics in Industry
Bouma, Gosse; Ittoo, Ashwin; Basile, Valerio; Wortmann, Hans; Metais, Elisabeth

Book published by Elsevier Science (2014)

See detailOptimally Locating Facilities with Variable Characteristics
Kucukaydin, Hande; Altinel, I. Kuban; Aras, Necati

Book published by LAP Lambert Academic Publishing (2012)

The main focus of this study is on competitive facility location problems which constitute a special family of facility location problems. In such a problem, a firm or franchise is concerned with inst...

See detailNatural Language Processing and Information Systems
Bouma, Gosse; Ittoo, Ashwin; Metais, Elisabeth; Wortmann, Hans

Book published by Springer (2012)

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See detailEstimation of a general parametric location in censored regression
Heuchenne, Cédric; Van Keilegom, Ingrid

in Exploring research frontiers in contemporary statistics and econometrics - A Festschrift for Léopold Simar (2012)

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See detailAutomatic Cargo Load Planning: Special shipments
Limbourg, Sabine; Schyns, Michael

in Cornelis, Eric (Ed.) Proceedings of the BIVEC-GIBET Transport Research Day 2011 (2011)

The aircraft loading problem is a real-world combinatorial optimisation problem highly constrained. Indeed, loading the aircraft so the gross weight is less than the maximum allowable is not enough. T...

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See detailBoolean Functions: Theory, Algorithms, and Applications
Crama, Yves; Hammer, Peter L.

Book published by Cambridge University Press (2011)

This monograph provides the first comprehensive presentation of the theoretical, algorithmic and applied aspects of Boolean functions, i.e., {0,1}-valued functions of a finite number of {0,1}-valued v...

See detailModèles mathématiques en gestion
Bair, Jacques; Crama, Yves; Henry, Valérie; Justens, Daniel

Book published by Cassini et POLE (2011)

Mis au point notamment pour la gestion de très grands projets industriels, les modèles mathématiques se sont imposés à tous les niveaux de l’activité économique : production, distribution et ...

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See detailLift-and-project inequalities
Louveaux, Quentin

in Wiley Encylopedia of Operations Research and Management Science (2011)

The lift-and-project technique is a systematic way to generate valid inequalities for a mixed binary program. The technique is interesting both on the theoretical and on the practical point of view. O...

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See detailModèles de localisations optimales de hubs de conteneurs sur un réseau multimodal européen
Limbourg, Sabine

in Lebacque, Jean-Patrick; Aron, Maurice; Farhi, Nadir (Eds.) Modélisation des réseaux de transport (2011)

Le monde des transports et de la mobilité requiert une restructuration vu la croissance des échanges. Transférer une partie du trafic de marchandises de la route vers des modes de transports plus r...

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See detailThe Mathematics of Peter L. Hammer (1936-2006): Graphs, Optimization, and Boolean Models
Boros, Endre; Crama, Yves; De Werra, Dominique; Hansen, Pierre; Maffray, Frédéric

in Boros, Endre; Crama, Yves; De Werra, Dominique; Hansen, Pierre; Maffray, Frédéric; Simeone, Bruno (Eds.) The Mathematics of Peter L. Hammer (1936-2006): Graphs, Optimization, and Boolean Models (2011)

This volume of the Annals of Operations Research, contains a collection of papers published in memory of Peter L. Hammer. As we recall further down, Peter made substantial contributions to several are...

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See detailBoolean Models and Methods in Mathematics, Computer Science, and Engineering
Crama, Yves; Hammer, Peter L.

Book published by Cambridge University Press (2010)

This collection of papers proposes in-depth presentations of a variety of advanced topics related to Boolean functions and expressions. The chapters are written by some of the most prominent experts i...

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See detailAlternative to the Mean-Variance Asset Allocation Analysis: A Scenario Methodology for Portfolio Selection
Schyns, Michael; Hübner, Georges; Crama, Yves

in Gregoriou, Greg N. (Ed.) Stock Market Volatility (2009)

This paper introduces a new methodology to optimize the allocation of financial assets. The objective of the model is to maximize the expected return of the portfolio under constraints limiting its Va...

See detailNonparametric Mean Preservation in Censored Regression
Heuchenne, Cédric

Book published by VDM Verlag (2009)

The aim of this book is to estimate the conditional mean of some functions depending on the response variable Y (moments, distributions...) in regression models where this response is possibly censore...

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See detailModèles et données dans l’univers économique
Bair, Jacques; Crama, Yves

in Justens, Daniel (Ed.) Attentes d'un modèle (2008)

Dans cette note, nous émettons quelques réflexions relatives à la modélisation scientifique, en insistant sur la spécificité de l'exploitation de modèles dans les sciences humaines, en particul...

See detailThe determinants of CDS prices: an industry-based investigation
Sougné, Danielle; Heuchenne, Cédric; Hübner, Georges

in Wagner, Niklas (Ed.) Credit Risk: Models, Derivatives and Management. Empirical Studies and Analysis. Financial Mathematics Series. (2008)

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See detailInter-modal freight terminal location in Europe : a strategic model
Jourquin, Bart; Limbourg, Sabine

in Proceedings of the BIVEC-GIBET, Transport Research Day 2007 (2007)

The political pressure in favour of multi- and inter-modal transport has oriented the focus on sustainable transport solutions. Inter-modal transport is one of the possible solutions, but its efficien...

See detailParametric conditional mean and variance testing with censored data
Heuchenne, Cédric; González Manteiga, Wenceslao; Sánchez Sellero, Cesar

in H. Skiadas, Christos (Ed.) Recent Advances in Applied Stochastic Models and Data Analysis. (2007)

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See detailCorporate control concentration measurement and firm performance
Crama, Yves; Leruth, Luc; Renneboog, Luc; Urbain, Jean-Pierre

in Batten, J.A.; Fetherston, T.A. (Eds.) Social Responsibility: Corporate Governance Issues (2003)

Traditionally share price returns and their variance have been explained by factors linked to the operations of the company such as systematic risk, corporate size and P/E ratios or by factors related...

See detailVisualizing Statistical Models and Concepts
Farebrother, Robert W.; Schyns, Michael

Book published by Marcel Dekker, Inc (2002)

This text/reference examines classic algorithms, geometric diagrams, and mechanical principles for enhanced visualization of statistical estimation procedurs and mathematical concepts in physics, engi...

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See detailPseudo-Boolean optimization
Crama, Yves; Hammer, Peter L.

in Resende, M.G.C.; Pardalos, P.M. (Eds.) Handbook of Applied Optimization (2002)

This article briefly surveys some fundamental results regarding pseudo-Boolean functions....

See detailThéorie stochastique de la décision d'investissement
Justens, Daniel; Schyns, Michael

Book published by De Boeck & Larcier (1997)

La complexité, l'imprévisibilité croissantes de l'environnement et de la structure interne des entreprises contraignent le gestionnaire à tendre vers une description probabiliste de l'univers. Le ...

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See detailRobotic flowshop scheduling is strongly NP-complete
Crama, Yves; Van de Klundert, Joris

in Klein Haneveld, W.K.; Vrieze, O.J.; Kallenberg, L.C.M. (Eds.) Ten Years LNMB (1997)

We consider a robotic flowshop model in which a single robot is responsible for the transportation of parts between machines and the amount of time that a part spends on a machine must be comprised in...

See detailProduction Planning in Automated Manufacturing
Crama, Yves; Oerlemans, Alwin G.; Spieksma, Frits C.R.

Book published by Springer Science & Business Media B.V. - Second, revised and enlarged edition. (First edition: 1994) (1996)

See detailProduction Planning in Automated Manufacturing
Crama, Yves; Oerlemans, Alwin G.; Spieksma, Frits C.R.

Book published by Springer-Verlag - First edition. (Second, revised and enlarged edition: 1996) (1994)




Papers - Books - Working Papers - Conferences

Working papers, reports, thesis


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See detailTesting revealed preference: An algorithmic outlook
Smeulders, Bart; Crama, Yves; Spieksma, Frits C.R.

E-print/Working paper (2017)

Revealed preference theory is a domain within economics that studies rationalizability of behavior by (certain types of) utility functions. Given observed behavior in the form of choice data, testing ...

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See detailDesign and Management of Freight Transport Networks: Intermodal Transport and Externalities
Mostert, Martine

Doctoral thesis (2017)

Transportation of goods contributes to the economic development of societies but it generates negative impacts on its environment called negative externalities. In its White Paper on Transport, the Eu...

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See detailRésultats des enquêtes "Attrait des Sciences" (années académiques 2015–2016 et 2016–2017)
Aerts, Stéphanie; Ernst, Marie

Report (2017)

Lors des rentrées académiques 2015-2016 et 2016-2017, une enquête a été envoyée aux étudiants primants inscrits en Faculté des Sciences. Cette enquête interroge les étudiants sur leur parcou...

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See detailMulti-period vehicle allocation with uncertain transportation requests
Crama, Yves; Pironet, Thierry

E-print/Working paper (2017)

This work investigates optimization techniques for a multi-period vehicle allocation problem with uncertain requests. A company owning a limited fleet of trucks attempts to maximize its operational pr...

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See detailA tailored two-phase constructive heuristic for the three-dimensional Multiple Bin Size Bin Packing Problem with transportation constraints
Paquay, Célia; Limbourg, Sabine; Schyns, Michael

E-print/Working paper (2017)

This paper considers the three-dimensional Multiple Bin Size Bin Packing Problem which consists in packing a set of cuboid boxes into containers of various shapes with minimising unused space. The pro...

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See detailThe three-dimensional rectangular Multiple Bin Size Bin Packing Problem with transportation constraints: A case study in the eld of air transportation
Paquay, Célia

Doctoral thesis (2017)

According to the International Air Transport Association and Air Transport Action Group, 51.3 million metric tons of goods were transported by airlines in 2014. To transport luggage, freight and mail,...

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See detailBerge-acyclic multilinear 0-1 optimization problems
Buchheim, Christoph; Crama, Yves; Rodriguez Heck, Elisabeth

E-print/Working paper (2016)

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See detailCellwise Robust regularized discriminant analysis
Aerts, Stéphanie; Wilms, Ines

E-print/Working paper (2016)

Quadratic and Linear Discriminant Analysis (QDA/LDA) are the most often applied classification rules under normality. In QDA, a separate covariance matrix is estimated for each group. If there are mor...

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See detailInventory routing for perishable products
Rezaei Sadrabadi, Mahmood

Doctoral thesis (2016)

We explore three problems in this thesis and develop solution methods for each problem. First, an inventory routing problem for a perishable product with stochastic demands is considered and different...

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See detailLARCH: A package for estimating multinomial, nested, and cross-nested logit models that account for semi-aggregate data
Newman, Jeffrey; Lurkin, Virginie; Garrow, Laurie

E-print/Working paper (2016)

We present a summary of important computational issues and opportunities that arise from the use of semi-aggregate data (where the explanatory data for choice scenarios are not necessarily unique for ...

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See detailThe np- Control Charts with the Guaranteed In-Control Performance
Faraz, Alireza; Heuchenne, Cédric

E-print/Working paper (2016)

In this paper, we evaluate the in-control performance of np-control charts with estimated parameters. We then apply the bootstrap method to adjust the control charts’ limits to guarantee the desired...

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See detailEarly Detection of University Students in Potential Difficulty
Hoffait, Anne-Sophie; Schyns, Michael

E-print/Working paper (2016)

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. Academic failure is a relevant is...

See detailModeling in Air Transportation: Cargo Loading and Itinerary Choice
Lurkin, Virginie

Doctoral thesis (2016)

We examine two problems as part of this dissertation. The first is a cargo loading problem. The aim is to load a set of containers and pallets into a cargo aircraft that serves multiple airports. Our ...

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See detailA Comparison of Departure Time of Day Formulations
Lurkin, Virginie; Garrow, Laurie; Higgins, Matthew; Newman, Jeffrey; Schyns, Michael

E-print/Working paper (2016)

Airline passengers’ itinerary choices are influenced by many factors including carriers, prices, the number of connections, and departure times. This paper compares three different methods that have...

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See detailContinuous Departure Time of Day Preferences for Continental U.S. Airline Markets Segmented by Distance, Direction of Travel, Number of Time Zones, Day of Week and Itinerary Type
Lurkin, Virginie; Garrow, Laurie; Higgins, Matthew; Newman, Jeffrey; Schyns, Michael

E-print/Working paper (2016)

Airlines use itinerary choice models to allocate the total number of passengers in a city pair to specific itineraries. In a related paper, we estimated a multinomial logit (MNL) itinerary choice mode...

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See detailNonparametric control charts: economic statistical design
Marcos Alvarez, Alejandro; Heuchenne, Cédric; Faraz, Alireza

E-print/Working paper (2016)

This paper studies economic statistical designs (ESD) for nonparametric control charts based on the sign and Wilcoxon tests. The main advantage of the procedures is that, except for the tested locatio...

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See detailOnline Learning for Strong Branching Approximation in Branch-and-Bound
Marcos Alvarez, Alejandro; Wehenkel, Louis; Louveaux, Quentin

E-print/Working paper (2016)

We present an online learning approach to variable branching in branch-and-bound for mixed-integer linear problems. Our approach consists in learning strong branching scores in an online fashion and i...

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See detailFeasibility-oriented Branching Strategies for Global Optimization
Gerard, Damien; Köppe, Matthias; Louveaux, Quentin

E-print/Working paper (2016)

We study the spatial Brand-and-Bound algorithm for the global optimization of nonlinear problems. In particular we are interested in a method to find quickly good feasible solutions. Most spatial Bran...

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See detailLarge neighborhood search for multi-trip vehicle routing
François, Véronique; Arda, Yasemin; Crama, Yves; Laporte, Gilbert

E-print/Working paper (2015)

We consider two large neighborhood search approaches for the multi-trip vehicle routing problem, where each vehicle can perform several routes during the working shift to serve a set of customers. The...

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See detailNonparametric and bootstrap techniques applied to financial risk modeling
Hambuckers, julien

Doctoral thesis (2015)

For the purpose of quantifying financial risks, risk managers need to model the behavior of financial variables. However, the construction of such mathematical models is a difficult task that requires...

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See detailTesting Theories of Choice Behaviour
Smeulders, Bart

Doctoral thesis (2015)

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See detailDoc'Data: mesure de la persévérance au doctorat à l'Université de Liège
Aerts, Stéphanie; Haesbroeck, Gentiane; Schyns, Michael

Report (2015)

Le Conseil du Doctorat a parmi ses missions celle d’accompagner les doctorants dans leur parcours et de mettre en place des actions en vue de favoriser la réussite. Cependant, pour réellement mesu...

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See detailA semiparametric model for Generalized Pareto regression based on a dimension reduction assumption
Hambuckers, julien; Heuchenne, Cédric; Lopez, Olivier

E-print/Working paper (2015)

In this paper, we consider a regression model in which the tail of the conditional distribution of the response can be approximated by a Generalized Pareto distribution. Our model is based on a semipa...

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See detailA branch-and-price algorithm for 2-period vehicle routing problems
Crama, Yves; Rezaei Sadrabadi, Mahmood; Van Woensel, Tom

E-print/Working paper (2015)

We consider a Vehicle Routing Problem (VRP) with deterministic orders in two periods from a set of stores. Orders in period 1 (2) can be postponed (advanced) to the other period but any diversion from...

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See detailMachine Learning to Balance the Load in Parallel Branch-and-Bound
Marcos Alvarez, Alejandro; Wehenkel, Louis; Louveaux, Quentin

E-print/Working paper (2015)

We describe in this paper a new approach to parallelize branch-and-bound on a certain number of processors. We propose to split the optimization of the original problem into the optimization of severa...

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See detailA NLP-MILP iterating algorithm for operational planning in electrical distribution systems
Gerard, Damien; Louveaux, Quentin; Cornélusse, Bertrand

E-print/Working paper (2015)

We consider a class of optimal power flow (OPF) applications where some loads offer a modulation service in exchange for an activation fee. These applications can be modeled as multi-period formulatio...

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See detailMulti-period Stochastic Optimization Problems in Transportation Management
Pironet, Thierry

Doctoral thesis (2014)

The topic of this thesis in management science is to propose a methodology to tackle multi-period decision problems including stochastic forecasts and to apply it to the field of transportation manage...

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See detailEstimating the out-of-sample predictive ability of trading rules: a robust bootstrap approach
Hambuckers, julien; Heuchenne, Cédric

E-print/Working paper (2014)

In this paper, we estimate the out-of-sample predictive ability of a set of trading rules. Usually, this ability is estimated using a rolling-window sample-splitting scheme, true out-of-sample data be...

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See detailShort Prime Quadratizations of Cubic Negative Monomials
Crama, Yves; Rodriguez Heck, Elisabeth

E-print/Working paper (2014)

Pseudo-Boolean functions naturally model problems in a number of different areas such as computer science, statistics, economics, operations research or computer vision, among others. Pseudo-Boolean o...

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See detailOptimization of the service start time for an elementary shortest path problem with time windows
Arda, Yasemin; Crama, Yves; Kucukaydin, Hande

E-print/Working paper (2014)

We investigate an elementary shortest path problem with resource constraints where a single capacitated vehicle, initially located at a depot, must serve a set of customers while respecting their indi...

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See detailA new methodological approach for error distributions selection in Finance
Hambuckers, julien; Heuchenne, Cédric

E-print/Working paper (2014)

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the tradit...

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See detailEstimation of the error distribution in nonparametric regression with cross-sectional data
Heuchenne, Cédric; Laurent, Géraldine

E-print/Working paper (2014)

In this article, we study the nonparametric regression model Y=m(X)+varepsilon where m(x)=E[Y|X=x] and sigma²(x)=Var[varepsilon|X=x] are unknown smooth functions, and the error varepsilon has zero me...

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See detailParametric conditional variance estimation in location-scale models with censored data
Heuchenne, Cédric; Laurent, Géraldine

E-print/Working paper (2014)

Suppose the random vector (X,Y) satisfies the regression model Y=m(X)+sigma(X)*varepsilon, where m(.)=E(Y|.), sigma²(.)=Var(Y|.) belongs to some parametric class {sigma _theta(.): theta in Theta} and...

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See detailNonparametric regression with cross-sectional data: an alternative to conditional product-limit estimators
Heuchenne, Cédric; Laurent, Géraldine

E-print/Working paper (2014)

Suppose the random vector (X,Y) satisfies the nonparametric regression model Y=m(X)+varepsilon, where m(x)=E[Y|X=x] and sigma²(x)=Var[varepsilon|X=x] are unknown smooth functions and the error vareps...

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See detailA multifractal formalism based on the Sν spaces: From theory to practice
Esser, Céline; Kleyntssens, Thomas; Nicolay, Samuel

E-print/Working paper (2014)

We present an implementation of a multifractal formalism based on the Sν spaces and show that it effectively gives the right Hölder spectrum in numerous cases. In particular, it allows to recover no...

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See detailA Supervised Machine Learning Approach to Variable Branching in Branch-And-Bound
Marcos Alvarez, Alejandro; Louveaux, Quentin; Wehenkel, Louis

E-print/Working paper (2014)

We present in this paper a new approach that uses supervised machine learning techniques to improve the performances of optimization algorithms in the context of mixed-integer programming (MIP). We fo...

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See detailOn the importance of Quality, Liquidity Level and Liquidity Risk: A Markov-Switching Regime Approach
Bazgour, Tarik; Sougné, Danielle; Heuchenne, Cédric

E-print/Working paper (2014)

See detailFrom censored to cross-sectional data: non and semiparametric new developments
Laurent, Géraldine

Doctoral thesis (2014)

In many statistical studies, an observation is evident: the available data are regularly right-censored. A censorship arises when, for different reasons, the data time of interest can not be observed....

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See detailApproximation Algorithms for Multi-Dimensional Vector Assignment Problems
Dokka, Trivikram; Crama, Yves; Spieksma, Frits C.R.

E-print/Working paper (2013)

We consider a special class of axial multi-dimensional assignment problems called multi-dimensional vector assignment (MVA) problems. An instance of the MVA problem is defined by $m$ disjoint sets, ea...

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See detailDynamic accelerated failure time model with endogeneity and heterogeneity: a control function appoach
Tiwari, Amaresh Kumar; Heuchenne, Cédric

E-print/Working paper (2013)

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See detailEstimation from cross-sectional data under a semiparametric truncation model
de Uña-Álvarez, Jacobo; Heuchenne, Cédric; Laurent, Géraldine

E-print/Working paper (2013)

Cross-sectional sampling is often used when investigating inter-event times, resulting in left-truncated and right-censored data. In this paper we consider a semiparametric truncation model in which t...

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See detailR&D, Capital Structure, and Agency Conflict: A Contingent Claim Analysis
Tiwari, Amaresh Kumar

E-print/Working paper (2013)

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See detailConditional asset allocation: Does Market-Wide Liquidity Matter?
Bazgour, Tarik; Sougné, Danielle; Heuchenne, Cédric

E-print/Working paper (2012)

This paper investigates the effect of market-wide liquidity on optimal portfolio allocations across US equity portfolios sorted by size and book-to-market characteristics. In particular, we consider a...

See detailLa vie boursière du premier fond de placement en Europe : Robeco, 1933-2010.
Lurkin, Virginie

Master's dissertation (2012)

Si les fonds communs de placement sont devenus au fil des ans un choix populaire chez les investisseurs qui sont désormais prêts à investir dans des actifs différents avec un seul véhicule d'inve...

See detailHow to optimally load a set of containers into an aircraft
Schyns, Michael; Limbourg, Sabine; Laporte, Gilbert

E-print/Working paper (2012)

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See detailA capacity game in transportation management
Amand, Guillaume; Arda, Yasemin

E-print/Working paper (2012)

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See detailMin max generalization for two-stage deterministic batch mode reinforcement learning: relaxation schemes
Fonteneau, Raphaël; Ernst, Damien; Boigelot, Bernard; Louveaux, Quentin

Report (2012)

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See detailOptimization Methods for the design and production of Naval Structures
Bay, Maud

Doctoral thesis (2011)

In the past decades the marine industry has undergone significant evolution and the production of large passenger ships faced dramatic changes. The size, the complexity and the security standards of t...

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See detailModélisation d'évènements rares à l'aide de distributions non normales : application en finance avec la fonction sinh-arcsinh
Hambuckers, julien

Master's dissertation (2011)

In 2008, the financial crisis put forward the relative inaccuracy of the market risk forecasting models in the financial industry. In particular, extreme events were shown to be regularly underestimat...

See detailSur les ensembles paradoxaux : de Banach-Tarski à Dougherty-Foreman
Kleyntssens, Thomas

Master's dissertation (2011)

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See detailOptimally Locating Facilities with Variable Characteristics
Kucukaydin, Hande

Doctoral thesis (2011)

Facility location problems aim at optimally locating facilities like plants, warehouses, convenience stores, shopping malls etc. They can have different objectives such as maximizing the profit gained...

See detailLikelihood based inference for semi-competing risks
Heuchenne, Cédric; Legrand, Catherine; Laurent, Stéphane; Van Keilegom, Ingrid

E-print/Working paper (2011)

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See detailEstimating the residual distribution in a semiparametric transformation model.
Heuchenne, Cédric; Samb, Rawane; Van Keilegom, Ingrid

E-print/Working paper (2011)

See detailEstimation of the error density in a semi-parametric transformation model.
Samb, Rawane; Heuchenne, Cédric; Van Keilegom, Ingrid

E-print/Working paper (2011)

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See detailRobust maximum weighted independent-set problems on interval graphs
Talla Nobibon, Fabrice; Leus, Roel

Report (2011)

We study the maximum weighted independent-set problem on interval graphs with uncertainty on the vertex weights. We use the absolute robustness criterion and the min-max regret criterion to evaluate s...

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See detailPROJECT SCHEDULING WITH MODULAR PROJECT COMPLETION ON A BOTTLENECK RESOURCE
Coolen, Kris; Wenchao, Wei; Talla Nobibon, Fabrice; Leus, Roel

Report (2011)

In this paper, we model a research-and-development project as consisting of several modules, with each module containing one or more activities. We examine how to schedule the activities of such a pro...

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See detailCritical analysis of the WORLDNET freight flow matrices
Chevalier, Simon; Limbourg, Sabine

E-print/Working paper (2010)

The growing trade between Europe and the rest of the world and the enlargement of the European Union has led the European Commission’s Directorate-General for Energy and Transport to fund Worldnet ...

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See detailA Meta Model to Optimal Design the VSI T2 Chart
Faraz, Alireza; Heuchenne, Cédric; Saniga, E.

Report (2010)

See detailRAPPORT DE RECHERCHE SUR UNE APPLICATION DE GESTION DE LA COLLABORATION DU SERVICE EXPÉDITION DU CHARGEUR AVEC LE TRANSPORTEUR
Pironet, Thierry; Crama, Yves; Arda, Yasemin; Schyns, Michael; Rosso, Vanessa; Kronus, David; Wauthelet, Yves; Lange, Jean-Charles; Tran, Vi

Report (2009)

Dans ce rapport, les échanges d'information d'un donneur d'ordre, d'un transporteur et d'un fournisseur au sein d'une chaîne de distribution sont analysés. Les possibilités de tracking et de traci...

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See detailLocal search heuristics for large-scale discrete structural optimization with expensive black-box evaluations
Bay, Maud; Crama, Yves; Rigo, Philippe

Report (2009)

This paper considers large-scale structural optimization problems featuring discrete variables, as well as nonlinear implicit constraints which can only be evaluated through time-expensive computation...

See detailRAPPORT INTERNE : REVUE DE LITTERATURE SUR LA GESTION DES RESSOURCES RÉUTILISABLES ET DES MÉTHODES D’OPTIMISATION
Pironet, Thierry; Crama, Yves; Arda, Yasemin; Schyns, Michael; Rosso, Vanessa; Kronus, David

Report (2009)

Dans cette revue de la littérature scientifique, on peut trouver une synthèse des thématiques liées aux modèles et aux techniques d'optimisation utilés pour la gestion de ressources réutilisabl...

See detailRAPPORT DE RECHERCHE SUR L’OPTIMISATION DU ROUTAGE ET DU CHARGEMENT DE VEHICULES.
Pironet, Thierry; Crama, Yves; Arda, Yasemin; Schyns, Michael; Rosso, Vanessa; Kronus, David

Report (2009)

Dans ce rapport confidentiel, un algorithme d'optimisation du chargement de véhicules a été mis au point dans le cadre d'une application avec un partenaire industriel....

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See detailA Markov chain model of power indices in corporate structures
Crama, Yves; Leruth, Luc; Wang, Su

E-print/Working paper (2009)

This paper proposes to use a game-theoretic framework in analyzing complex corporate networks, notably in measuring the ``amount of control'' of both direct and indirect shareholders. The values of th...

See detailEcoTransHy, Rapport final de conclusions
Andre, Jean; Brac, Jean; de Wolf, Daniel; Maisonnier, Guy; Ould Sidi, Mohammed; Simonnet, Antoine

Report (2008)

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See detailPolitiques d’approvisionnement dans les systèmes à plusieurs fournisseurs et Optimisation des décisions dans les chaînes logistiques décentralisées
Arda, Yasemin

Doctoral thesis (2008)

Coordinating product flows between the partners of a supply chain is a difficult task because of random variations in demand and supply processes and the antagonistic nature of the individual economic...

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See detailGoodness-of-fit tests for censored regression based on artificial data points
González Manteiga, Wenceslao; Heuchenne, Cédric; Sánchez Sellero, Cesar

Report (2008)

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See detailPlanification stratégique de Systèmes de transport de marchandises en Europe : Modèles de localisations optimales de hubs de conteneurs sur un réseau multimodal
Limbourg, Sabine

Doctoral thesis (2007)

There is a growing imbalance between modes of transport in the European Union. The increasing success of road results in an ever worsening congestion, more environmental nuisances and accidents. That...

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See detailCutting planes from two rows of the simplex tableau (extended version)
Andersen, Kent; Louveaux, Quentin; Weismantel, Robert; Wolsey, Laurence

E-print/Working paper (2006)

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See detailA branch and bound framework applied to naval structure optimization problems
Bay, Maud

Master of advanced studies dissertation (2005)

Naval structure optimization consists of defining the optimum scantling of the constitutive elements of a structure with given general dimensions and form of the hull. Amathematical formulation leads ...

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See detailGrafting Information in Scenario Trees: Application to Option Prices
Schyns, Michael; Crama, Yves; Hübner, Georges

E-print/Working paper (2005)

The high level of sophistication in portfolio management modeling techniques often goes along with very large output sensitivity to parameter choices. As a potential solution to this problem, this pap...

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See detailExploring Structure and Reformulations in Different Integer Programming Algorithms
Louveaux, Quentin

Doctoral thesis (2004)

In this thesis we consider four topics all related to using problem reformulations in order to solve integer programs, i.e. optimization problems in which the decision variables must be integer. We fi...

See detailAnalyse de politiques de gestion de stocks au sein d'une chaîne logistique
Arda, Yasemin

Master's dissertation (2003)

Cette étude s'intéresse au problème de gestion de stock d’une entreprise dont le stock est approvisionné par des fournisseurs extérieurs. Les demandes arrivent en suivant un processus de Poisso...

See detailIntegration of fuzzy optimization and stochastic programming in multi-commodity network flow problems
Arda, Yasemin

Master's dissertation (2001)

This study analyzes the problem of transporting vital commodities and emergency personnel during the response stage of a disaster relief operation by integrating fuzzy linear optimization and stochast...

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See detailModelling Financial Data and Portfolio Optimization Problems
Schyns, Michael

Doctoral thesis (2001)

This doctoral dissertation in management science, entitled “Modelling Financial Data and Portfolio Optimization Problems”, consists of two independent parts, whose unifying theme is the constructi...

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See detailPrétraitement de données en reconnaissance de formes par RNA
Schyns, Michael

Master's dissertation (1993)

Les réseaux de neurones n'ont malheureusement pas que des avantages. Leur taille croît avec la quantité et la complexité des données à traiter. Or le principal inconvénient du RNA est lié à s...

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See detailThe complexity of scheduling short tasks with few starting times
Crama, Yves; Spieksma, Frits C.R.

Report (1992)

The following problem is proved to be NP-complete: given n tasks, such that each task has processing time \tau=2, and has no more than k=3 possible starting times, does there exist a feasible schedule...




Papers - Books - Working Papers - Conferences

Conferences


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See detailIndexing grey multilingual literature in General Practice in the era of Semantic Web
Jamoulle, Marc; Resnick, Melissa; Ittoo, Ashwin; Vander Stichele, Robert; Cardillo, Elena; Grosjean, Julien; Darmoni, Stefan; Vanmeerbeek, Marc

in The Grey Journal (2017, October 23)

voir abstract ci-dessous...

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See detailRegularized Discriminant Analysis in Presence of Cellwise Contamination
Aerts, Stéphanie; Wilms, Ines

Conference (2017, August 01)

Quadratic and Linear Discriminant Analysis (QDA/LDA) are the most often applied classification rules under normality. In QDA, a separate covariance matrix is estimated for each group. If there are mor...

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See detailA bilevel modelling approach to service network design and pricing: Application to intermodal transportation
Tawfik, Christine Maher Fouad; Limbourg, Sabine

Conference (2017, July 18)

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See detailLinearization and quadratization techniques for 0-1 optimization problems
Rodriguez Heck, Elisabeth; Crama, Yves

Conference (2017, July 17)

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See detailA bilevel modelling approach to service network design and pricing: Application to intermodal transportation
Tawfik, Christine Maher Fouad; Limbourg, Sabine

Conference (2017, July 14)

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See detailA class of valid inequalities for multilinear 0-1 optimization problems
Rodriguez Heck, Elisabeth; Crama, Yves

Conference (2017, July 13)

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See detailEarly detection of university students with potential difficulties
Hoffait, Anne-Sophie; Schyns, Michael

Conference (2017, July)

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. We aim at early detection of pote...

See detailIs a new definition of intermodal transport interesting for transferring flows from road to more environmentally friendly modes?
Mostert, Martine; Limbourg, Sabine; Caris, An

Conference (2017, July)

Road remains the most used mode in Europe. Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment l...

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See detailOptimising workforce and energy costs by exploiting production flexibility
Cuvelier, Thibaut; Louveaux, Quentin

Conference (2017, July)

In a world where the electricity prices become more and more volatile, notably due to renewable energies, the industry is suffering from cost variations never seen before, especially when electro-inte...

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See detailAn integrated logistics decision support model for city logistics
Limbourg, Sabine

Scientific conference (2017, June 28)

Today, more than 50% of the world's population lives in cities; the urban population is projected to reach 85% by 2100. Mainly due to urbanization and e-commerce, the demand for urban freight transpor...

See detailCellwise robust regularized discriminant analysis
Aerts, Stéphanie; Wilms, Ines

Conference (2017, June 02)

Quadratic and Linear Discriminant Analysis (QDA/LDA) are the most often applied classification rules under normality. In QDA, a separate covariance matrix is estimated for each group. If there are mo...

See detailVariable selection in proportional hazards cure model with time-varying covariates, application to bank failures
Beretta, Alessandro; Heuchenne, Cédric

Conference (2017, June)

In the last three decades, as a consequence of failures and corporate actions, the number of commercial banks in the United States has shrunk by two thirds. Empirical evidence in the analysis of bank ...

See detailIntermodal transport: does a wider definition improve its competitiveness?
Mostert, Martine; Limbourg, Sabine; Caris, An

Conference (2017, June)

With the opening of borders and always greater decentralization of production, freight transport increased a lot in the last decades. Road remains the most used mode in Europe (Eurostat, 2016). Even i...

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See detailOperational assessment of intermodality future in Belgium: Best-case scenario
Tawfik, Christine Maher Fouad; Limbourg, Sabine

in Proceedings of the BIVEC/GIBET Transport Research Days 2017 (2017, May)

From the perspective of stimulating intermodal transport as an ecological and economically promising freight transport scheme in the EU, this paper is devoted to assess its future position with respec...

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See detailCan any possible combination of modes improve intermodal attractiveness?
Mostert, Martine; Caris, An; Limbourg, Sabine

in Proceedings of the BIVEC-GIBET Transport Research Days 2017 (2017, May)

In its White Paper on Transport, the European Commission recognizes intermodal transport as an alternative solution to road transport. In practice, intermodal transport can be constituted by any combi...

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See detailA terminology in General Practice / Family Medicine to represent non-clinical aspects for various usages
Jamoulle, Marc; Grosjean, Julien; Ittoo, Ashwin; Resnick, Melissa; Treuherz, Arthur; Vander Stichele, Robert H; Cardillo, Elena; SHAMENEK, Frank; Vanmeerbeek, Marc

in R. Randell et al. (Ed.) Informatics for Health: Connected Citizen-Led Wellness and Population Health (2017, April 24)

Abstract. The hereby proposed terminology called “Q-Codes” can be defined as an extension of the International Classification of Primary Care (ICPC-2). It deals with non-clinical concepts that are...

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See detailModelling the industrial flexibility from the electricity consumption and HR points of view
Cuvelier, Thibaut; Louveaux, Quentin

Conference (2017, April 21)

See detailA class of valid inequalities for multilinear 0-1 optimization problems
Rodriguez Heck, Elisabeth; Crama, Yves

Poster (2017, March 21)

See detailA class of valid inequalities for multilinear 0-1 optimization problems
Rodriguez Heck, Elisabeth; Crama, Yves

Conference (2017, March 13)

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See detailA best fit heuristic for the three-dimensional Bin Packing Problem with practical constraints from an air transportation application
Paquay, Célia; Limbourg, Sabine; Schyns, Michael

in Proceedings of the BIVEC-GIBET Transport Research Days 2017 (2017)

This work considers the three-dimensional Multiple Bin Size Bin Packing Problem which consists in packing a set of cuboid boxes into containers of various shapes, while minimising unused space. The ai...

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See detailCan Autonomous Vehicles Reduce Car Mobility? Evidence from a Stated Adaptation Experiment in Belgium
Cools, Mario; Rongy, Caroline; Limbourg, Sabine

in Transportation Research Board Annual Meeting. Compendium of Papers (2017)

From literature, it is clear that the discussion about the potential benefits and drawbacks of autonomous vehicles is not finished. In order to provide insight into this discussion, this paper investi...

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See detailA class of valid inequalities for multilinear 0-1 optimization problems
Rodriguez Heck, Elisabeth; Crama, Yves

Conference (2016, December 14)

See detailLes problèmes “riches” de tournées de véhicules
Limbourg, Sabine

Conference (2016, November 03)

See detailLa compétitivité du transport intermodal
Limbourg, Sabine

Conference (2016, November 02)

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See detailA full inference toolbox to measure multivariate relative dispersion
Aerts, Stéphanie; Haesbroeck, Gentiane

Conference (2016, October 14)

In the univariate context, coefficients of variation (CV) are widely used to compare the dispersion of a variable in several populations. When the comparison is based on p characteristics however, sid...

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See detailRobust discriminant analysis based on the joint graphcial lasso estimator
Aerts, Stéphanie; Croux, Christophe; Wilms, Ines

Poster (2016, October)

Linear and Quadratic Discriminant Analysis (LDA/QDA) are the most often applied classification rules under the normality assumption. When there is not enough data, the quadratic rule, which requires t...

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See detailRaffinement de l'estimation asymptotique de l'exposant de Hölder
Kleyntssens, Thomas; Nicolay, Samuel

Conference (2016, September 19)

Dans cet exposé, nous proposons une nouvelle approche basée sur les ondelettes (via les espaces Snu) permettant d'étudier plus finement la régularité Höldérienne d'une fonction...

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See detailA Bilevel Design and Pricing Model for an Intermodal Service Network
Tawfik, Christine Maher Fouad; Limbourg, Sabine

Scientific conference (2016, September 09)

This work addresses the problem of jointly designing and pricing intermodal freight services during a medium-term planning horizon. Given the innate hierarchy in the problem, a bilevel program is cons...

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See detailBalanced words and related concepts: applications and complexity issues
Crama, Yves

Conference (2016, September 05)

In this talk, I present a few results and several questions about "regular" sequences of integers and related concepts, such as balanced words, partitions and covers of the integers by arith...

See detailReformulations of nonlinear binary optimization problems
Crama, Yves

Scientific conference (2016, August 17)

See detailOperational costs and externalities in optimal intermodal network design
Mostert, Martine; Limbourg, Sabine; Caris, An

Conference (2016, July 13)

Transportation of goods is essential for the economy but also leads to harmful impacts related to human health aspects. Intermodal transport is promoted by Europe to reduce these negative externalitie...

See detailOptimal returnable transport items management
Limbourg, Sabine; Martin, Adeline; Paquay, Célia

Conference (2016, July 11)

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners ...

See detailNeighborhood search approaches for multi-trip vehicle routing problems
François, Véronique; Arda, Yasemin; Crama, Yves

Conference (2016, July 06)

We introduce two large neighborhood search approaches for solving the multi-trip vehicle routing problem (MTVRP), where each vehicle can perform several routes to serve a set of customers. The problem...

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See detailColumn Generation Based Algorithms for a VRP with Time Windows and Variable Departure Times
Michelini, Stefano; Arda, Yasemin; Küçükaydin, Hande

Conference (2016, July 05)

We investigate a solution methodology for a variant of the VRP with time windows. In the examined variant, the departure time of each vehicle from the depot can be determined by the decision-maker, wh...

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See detailEarly detection of university students in potential difficulty
Hoffait, Anne-Sophie; Schyns, Michael

Conference (2016, July)

See detailBRAIN-TRAINS: Scenario development to explore intermodal rail transport expansion in, from and towards Belgium
Troch, Frank; Vanelslander, Thierry; Sys, Christa; Stevens, Vidar; Verhoest, Koen; Tawfik, Christine Maher Fouad; Mostert, Martine; Limbourg, Sabine; Merchan Arribas, Angel; Belboom, Sandra

Conference (2016, July)

See detailQuadratic reformulations of nonlinear binary optimization problems
Crama, Yves

Conference (2016, July)

A {\em pseudo-Boolean function} is a real-valued function $f(x)=f(x_1,x_2,\ldots,x_n)$ of $n$ binary variables, that is, a mapping from $\{0,1\}^n$ to $\mathbf R$. \emph{Nonlinear binary optimization ...

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See detailMonitoring partnership networks- A graph theory approach
Faraz, Alireza; Treiblmaier, Horst; Gerschberger, Markus

Conference (2016, June 17)

Recently, companies are forming strong relationships with their strategic suppliers and customers in order to maximize their profit in the global market. Such a partnership or strategic alliance is ba...

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See detailA class of valid inequalities for multilinear 0-1 optimization problems
Rodriguez Heck, Elisabeth; Crama, Yves

Poster (2016, June 02)

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See detailDirect control service from residential heat pump aggregation with specified payback
Georges, Emeline; Cornélusse, Bertrand; Ernst, Damien; Louveaux, Quentin; Lemort, Vincent; Mathieu, Sébastien

in Proceedings of the 19th Power Systems Computation Conference (PSCC) (2016, June)

This paper addresses the problem of an aggregator controlling residential heat pumps to offer a direct control flexibility service. The service is defined by a 15 minute power modulation, upward or do...

See detailAccounting for price endogeneity in airline itinerary choice models
Lurkin, Virginie

Scientific conference (2016, May 26)

This study formulates an itinerary choice model that is consistent with those used by industry and corrects for price endogeneity using a control function that uses several types of instrumental varia...

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See detailLa distribution par des véhicules électriques
Bay, Maud; Limbourg, Sabine

Scientific conference (2016, May 25)

The objective of vehicle routing problems is to design a set of efficient vehicle routes to provide goods from a depot to a set of customers satisfying specific constraints. Classical variants of thes...

See detailAccounting for price endogeneity in airline itinerary choice models
Lurkin, Virginie; Garrow, Laurie; Higgins, Matthew; Newman, Jeffrey; Schyns, Michael

Conference (2016, May 20)

This study formulates an itinerary choice model that is consistent with those used by industry and corrects for price endogeneity using a control function that uses several types of instrumental varia...

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See detailA Refined Method for Estimating the Global Hölder Exponent
Kleyntssens, Thomas; Kreit, Damien; Nicolay, Samuel

Conference (2016, April 12)

We give a wavelet characterization of the generalized Hölder spaces and show how this result can be applied to detect logarithmic corrections appearing in Brownian processes....

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See detailPoster EGU 2016: Mars Topography Investigated Through the Wavelet Leaders Method
Deliège, Adrien; Kleyntssens, Thomas; Nicolay, Samuel

Poster (2016, April)

This work examines the scaling properties of Mars topography through a wavelet-based formalism. We conduct exhaustive one-dimensional (both longitudinal and latitudinal) and two-dimensional studies ba...

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See detailThe Fractal Nature of Mars Topography Analyzed via the Wavelet Leaders Method
Kleyntssens, Thomas; Deliège, Adrien; Nicolay, Samuel

in Information Technology: New Generations (2016, April)

This paper studies the scaling properties of Mars topography based on Mars Orbiter Laser Altimeter (MOLA) data through the wavelet leaders method (WLM). This approach shows a scale break at 15 km. At ...

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See detailWavelet-based Methods to Study the Regularity of a Signal: from Theory to Practice
Kleyntssens, Thomas; Nicolay, Samuel

Conference (2016, March 23)

In this talk, I use the notion of wavelet to design multifractal formalisms. I present the theoritical results obtained on the generalized Snu spaces and I show the utility of these generalization. Be...

See detailModeling operational losses: a conditional Generalized Pareto regression based on a single-index assumption
Hambuckers, julien; Heuchenne, Cédric; Lopez, Olivier

Scientific conference (2016, March 09)

In this paper, we consider a regression model in which the tail of the conditional distribution of the response can be approximated by a Generalized Pareto distribution. Our model is based on a semipa...

See detailModeling operational losses: a conditional Generalized Pareto regression based on a single-index assumption
Hambuckers, julien; Heuchenne, Cédric; Lopez, Olivier

Scientific conference (2016, February 24)

In this paper, we consider a regression model in which the tail of the conditional distribution of the response can be approximated by a Generalized Pareto distribution. Our model is based on a semipa...

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See detailRecherche à voisinage large pour le problème de tournées de véhicules à voyages multiples
François, Véronique; Arda, Yasemin; Crama, Yves; Laporte, Gilbert

Conference (2016, February 10)

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See detailPredicting Review Helpfulness
Ittoo, Ashwin

in Proceedings (2016, February)

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See detailTightening linearizations of non-linear binary optimization problems
Rodriguez Heck, Elisabeth; Crama, Yves

Conference (2016, January 28)

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See detailCombining acceleration techniques for pricing in a VRP with time windows
Michelini, Stefano; Arda, Yasemin; Küçükaydin, Hande

Conference (2016, January 28)

In this study, we investigate a solution methodology for a variant of the VRP with time windows. The cost of each route depends on its overall duration (including waiting times), while the departure t...

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See detailService network design and pricing for intermodal freight transport
Tawfik, Christine Maher Fouad; Limbourg, Sabine

Scientific conference (2016)

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See detailThe Fractal Nature of Mars Topography Analyzed via the Wavelet Leaders Method
Kleyntssens, Thomas; Deliège, Adrien; Nicolay, Samuel

Poster (2016)

This work studies the scaling properties of Mars topography based on Mars Orbiter Laser Altimeter (MOLA) data through the wavelet leaders method (WLM). This approach shows a scale break at 15 km. At s...

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See detailMultivariate coefficients of variation: a full inference toolbox
Aerts, Stéphanie; Haesbroeck, Gentiane

Conference (2015, December 13)

The univariate coefficient of variation (CV) is a widely used measure to compare the relative dispersion of a variable in several populations. When the comparison is based on $p$ characteristics howev...

See detailModeling the dependence between extreme operational losses and economic factors: a conditional semi-parametric Generalized Pareto approach
Hambuckers, julien; Heuchenne, Cédric; Lopez, Olivier

Conference (2015, December)

In this paper, we model the severity distribution of operational losses data, condi- tional on some covariates. Indeed, previous studies [Chernobai et al., 2011, Cope et al., 2012, Chavez-Demoulin et ...

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See detailMonitoring The quality Loss Performance of Products
Faraz, Alireza; Treiblmaier, Horst

Conference (2015, November 03)

This paper presents a control chart based on the Taguchi (1986)’s loss function for monitoring the performance of a process and its capability in monetary form. The proposed chart monitors the loss ...

See detailRevealed preference tests of collectively rational consumption behavior
Crama, Yves

Scientific conference (2015, October 29)

To verify the empirical adequacy of a particular household consumption model, it is important to develop efficient tests did can be applied to real-world data. These tests check whether the observed h...

See detailQuadratizations of pseudo-Boolean functions
Crama, Yves

Conference (2015, October 23)

A pseudo-Boolean function is a real-valued function of 0-1 variables. Every pseudo-Boolean function can be represented by various analytical expressions, e.g., as a polynomial in its variables, or as ...

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See detailUse of the wavelet theory as a tool to investigate the l-abelian complexity of a sequence
Kleyntssens, Thomas; Nicolay, Samuel; Vandomme, Elise; Rigo, Michel

Poster (2015, September 23)

The concept of k-automatic sequences is at the intersection of number theory and formal language theory. It has been generalized by the notion of k-regularity that allows to study sequences with value...

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See detailThe leaders profile method: detection of distinct processes in a signal
Kleyntssens, Thomas; Nicolay, Samuel

Poster (2015, September 08)

The leaders profile method is a multifractal formalism that allows to compute non-concave and non-increasing spectra. Our implementation can detect the presence of distinct processes in a signal. We p...

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See detailBrain trains: scenario development to explore intermodal rail transport expansion in, from and towards Belgium
Troch, Frank; Vanelslander, Thierry; Belboom, Sandra; Léonard, Angélique; Limbourg, Sabine; Merchan Arribas, Angel; Mostert, Martine; Tawfik, Christine Maher Fouad; Stevens, Vidar; Sys, Christa; Verhoest, Koen

Conference (2015, September)

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See detailModelling Agents’ Behavior in the Context of River Floods: An Ant Colony based Approach
Saadi, Ismaïl; El Saeid Mustafa, Ahmed Mohamed; Teller, Jacques; Limbourg, Sabine; Cools, Mario

Conference (2015, September)

This paper presents a model for understanding short-term travelers’ behavior in the context of river floods. In several cities, river floods are considerably affecting urban transportation systems. ...

See detailEstimation of Airline Itinerary Choice Models Using Disaggregate Ticket Data
Lurkin, Virginie; Garrow, Laurie A.; Higgins, Matthew J.; Schyns, Michael

in 55th AGIFORS Annual Proceedings 2015 (2015, August 29)

Airline itinerary choice models support many multi-million dollar decisions, i.e., they are used to evaluate potential route schedules. Classic models suffer from major limitations, most notably they ...

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See detailBrain Trains: Intermodal Rail Freight Transport and Hinterland Connections - A Swot Analysis to Assess the Belgian Rail Practice
Troch, Frank; Vanelslander, Thierry; Sys, Christa; Belboom, Sandra; Léonard, Angélique; Limbourg, Sabine; Merchan Arribas, Angel; Mostert, Martine; Stevens, Vidar; Tawfik, Christine Maher Fouad; Verhoest, Koen

in Proceedings of the IAME Annual Conference 2015 (2015, August)

This paper focuses on transversal research of the role and influences of rail freight transport, as a part of intermodal transport in Belgium. The scope of the research concentrates on port hinterland...

See detailBranch-and-Price Based Matheuristics for a Vehicle Routing Problem with Time Windows and Variable Service Start Time
Küçükaydın, Hande; Arda, Yasemin; Crama, Yves; Michelini, Stefano

Conference (2015, July 15)

We investigate a vehicle routing problem with time windows (VRPTW), where the drivers are paid per time unit worked and the starting times of their shifts are to be determined by the decision maker. I...

See detailA general lotsizing problem with uncertain product returns
Amand, Guillaume; Arda, Yasemin

Conference (2015, July 15)

We consider a single-stage system that produces a range of final products. The demands of the final products are supposed deterministic over a finite planning horizon. Each unit of demand has to be fu...

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See detailIntermodal network design: a mixed-integer nonlinear model for costs and emissions minimization
Mostert, Martine; Limbourg, Sabine; Caris, An

Conference (2015, July 15)

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See detailStrengthening linear reformulations of pseudo-Boolean optimization problems
Rodriguez Heck, Elisabeth; Crama, Yves

Conference (2015, July 13)

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See detailFeasibility-oriented Branching Strategies for Global Optimization
Gerard, Damien; Köppe, Matthias; Louveaux, Quentin

Conference (2015, July 13)

We study the spatial Brand-and-Bound algorithm for the global optimization of nonlinear problems. In particular we are interested in a method to find quickly good feasible solutions. Most spatial Bran...

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See detailShewhart Control Charts with Guaranteed In-Control Performance
Faraz, Alireza; Heuchenne, Cédric; Woodall, W.H.

Conference (2015, July 08)

The in-control performance of the Shewhart X ̅ and S2 control charts with estimated in-control parameters has been evaluated by a number of authors. Results indicate an unrealistically large amount o...

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See detailA best fit decreasing algorithm for the three dimensional bin packing problem
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

Conference (2015, July)

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See detailBilevel optimization in the context of intermodal pricing: state of art
Tawfik, Christine Maher Fouad; Limbourg, Sabine

in Proceedings of the 18th Euro Working Group on Transportation, EWGT 2015 (2015, July)

With the rising interest to stimulate intermodal transport, determining pricing strategies can be intrinsically challenging. We provide a review on the current state of research in intermodal pricing,...

See detailQuadratization of pseudo-Boolean functions
Crama, Yves; Anthony, Martin; Boros, Endre; Gruber, Aritanan

Conference (2015, July)

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See detailOn the importance of Quality, Liquidity Level and Liquidity Risk: A Markov Switching Approach
Bazgour, Tarik; Heuchenne, Cédric; Sougné, Danielle

Conference (2015, June 27)

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See detailLinearization and quadratization approaches for non-linear 0-1 optimization
Rodriguez Heck, Elisabeth; Crama, Yves

Scientific conference (2015, June 23)

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See detailA generalization of the Snu spaces: getting rid of dyadic scales
Kleyntssens, Thomas; Nicolay, Samuel

Conference (2015, June 16)

The Snu spaces have been introduced by S. Jaffard to develop a new multifractal formalism that allows to improve the study of irregular functions. This type of formalism is connected to Besov spaces. ...

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See detailA three-mode bi-objective location model under economies of scale for intermodal transport
Mostert, Martine; Caris, An; Limbourg, Sabine

Conference (2015, June 14)

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See detailExact and Heuristic Solution Methods for a VRP with Time Windows and Variable Service Start Time
Michelini, Stefano; Arda, Yasemin; Crama, Yves; Küçükaydin, Hande

Conference (2015, June 10)

We consider a VRP with time windows in which the total cost of a solu- tion depends on the total duration of the vehicle routes, and the starting time for each vehicle is a decision variable. We first...

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See detailTSP model for electric vehicle deliveries, considering speed, loading and road grades
Bay, Maud; Limbourg, Sabine

Conference (2015, June 05)

The objective usually considered in sustainable transportation is to minimize pollution due to emissions, and equivalently energy consumption. Turning to electric mobility, pollution is related to ele...

See detailMonitoring supply chains with multivariate control charts: an economic-statistical design approach
Heuchenne, Cédric; Faraz, Alireza; Saniga, Erwin

Scientific conference (2015, June 02)

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See detailMulti-period vehicle assignment problem with stochastic transportation order availability
Pironet, Thierry; Crama, Yves

Conference (2015, June 01)

This work investigates optimization techniques for a vehicle-load assignment problem. A company owning a limited fleet of vehicles wants to maximize its operational profit over an infinite horizon div...

See detailWhat are the determinants of the operational losses severity distribution ? A multivariate analysis based on a semiparametric approach.
Hambuckers, julien; Heuchenne, Cédric; Lopez, Olivier

Poster (2015, June)

In this paper, we analyse a database of around 41,000 operational losses from the European bank UniCredit. We investigate three kinds of covariates: firm-specific, fi- nancial and macroeconomic covari...

See detailWhat the heck is Revenue Management
Lurkin, Virginie; Schyns, Michael; Garrow, Laurie

Scientific conference (2015, May 08)

The airline industry changed dramatically in 1978 when it became deregulated. Operations research analysts played a critical role after deregulation by developing algorithms and decision-support syste...

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See detailBRAIN TRAINS: Intermodal rail freight transport and hinterland connections A SWOT analysis to assess the Belgian rail practice
Troch, Frank; Vanelslander, Thierry; Belboom, Sandra; Léonard, Angélique; Limbourg, Sabine; Merchan Arribas, Angel; Mostert, Martine; Pauwels, Tom; Vidar, Stevens; Sys, Christa; Tawfik, Christine Maher Fouad; Verhoest, Koen

Scientific conference (2015, May)

This paper focuses on transversal research of the role and influences of rail freight transport, as a part of intermodal transport in Belgium. A SWOT analysis of the current situation is conducted, st...

See detailFunctions of binary variables
Crama, Yves

Conference (2015, April 29)

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See detailTSP model for electric vehicle deliveries, considering speed, loading and path slope.
Bay, Maud; Limbourg, Sabine

Conference (2015, April 17)

In the current Transport White Paper, the European Union presents a roadmap for a more competitive and sustainable European transport system. Concerning Urban Freight Transport, responsible for about ...

See detailWhat is the impact of ticket-level fare information on classic itinerary choice models ?
Lurkin, Virginie; Garrow, Laurie; Schyns, Michael

Scientific conference (2015, March 25)

I have been invited by Prof. Dr. Catherine Cleophas as an external guest to the "Revenue Management Colloquium" in Aix-la-Chapelle from March 25 to March 26. The aim is to present my own doc...

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See detailSeveral constructive heuristics for the three dimensional Multiple Bin Size Bin Packing Problem with air transportation constraints
Paquay, Célia; Limbourg, Sabine; Oliveira, José Fernando; Schyns, Michael

Conference (2015, March)

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See detailExact and Heuristic Solution Methods for a VRP with Time Windows and Variable Service Start Time
Michelini, Stefano; Arda, Yasemin; Crama, Yves; Küçükaydin, Hande

Conference (2015, February 05)

We consider a VRP with time windows in which the total cost of a solution depends on the duration of the vehicle routes, and the starting time for each vehicle is a decision variable. We first develop...

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See detailA mixed integer nonlinear programming bi-objective model for intermodal network design
Mostert, Martine; Caris, An; Limbourg, Sabine

Conference (2015, February 05)

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See detailEarly detection of university students in potential difficulty
Hoffait, Anne-Sophie; Schyns, Michael

Conference (2015, February)

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. Bu...

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See detailOptimal Assignment of Off-Peak Hours to Lower Curtailments in the Distribution Network
Merciadri, Luca; Mathieu, Sébastien; Ernst, Damien; Louveaux, Quentin

in Proceedings of the 5th European Innovative Smart Grid Technologies (ISGT) (2015)

We consider a price signal with two settings: off-peak tariff and on-peak tariff. Some loads are connected to specific electricity meters which allow the consumption of power only in off-peak periods....

See detailEstimating the error distribution function of a heteroskedastic nonparametric regression of cure model data
Chown, Justin; Heuchenne, Cédric; Van Keilegom, Ingrid

Conference (2015)

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See detailOn the Importance of Quality, Liquidity Level and Liquidity Risk: A Markov-Switching Regime Approach
Bazgour, Tarik; Heuchenne, Cédric; Sougné, Danielle

Conference (2014, December 16)

See detailIdentifying the best technical trading rule: a .632 bootstrap approach.
Hambuckers, julien; Heuchenne, Cédric

Conference (2014, December 07)

In this paper, we estimate the out-of-sample predictive ability of a set of trading rules. Usually, this ability is estimated using a rolling-window sample-splitting scheme, true out-of-sample data be...

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See detailQuadratizations of pseudo-Boolean functions
Rodriguez Heck, Elisabeth; Crama, Yves

Scientific conference (2014, December 04)

See detailThe Airline Container Loading Problem with Pickup and Delivery
Lurkin, Virginie; Schyns, Michael

Conference (2014, November 09)

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints. The originality of our approac...

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See detailEarly detection of university students in potential difficulty : a case study
Hoffait, Anne-Sophie; Schyns, Michael

Conference (2014, November)

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. Bu...

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See detailDistribution and robustness of a distance-based multivariate coefficient of variation
Aerts, Stéphanie

Poster (2014, November)

When one wants to compare the homogeneity of a characteristic in several popula- tions that have di erent means, the advocated statistic is the univariate coe cient of variation. However, in the multi...

See detailRevealed preference tests of collectively rational consumption behavior
Crama, Yves

Conference (2014, October 28)

To verify the empirical adequacy of a particular household consumption model, it is important to develop efficient tests that can be applied to real-world data. These tests check whether the observed ...

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See detailThe Airline Container Loading Problem with Pickup and Delivery
Lurkin, Virginie; Schyns, Michael

in Airline Group of the Intl Federation of Operational Research Soc ( AGIFORS ) (Ed.) 54th AGIFORS Annual Proceedings 2014 (2014, October 19)

The present paper looks into the problem of optimizing the loading of a set of containers and pallets into cargo aircraft serving multiple airports. Due to the pickup and delivery operations occurring...

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See detailDe l’importance des échelles dyadiques dans les espaces Snu
Kleyntssens, Thomas; Nicolay, Samuel

Conference (2014, September 23)

Le but de l’analyse multifractale est de fournir une méthode permettant d’approximer le spectre de singularités d’une fonction. En 1985, Frisch et Parisi ont proposé un premier formalisme. D'...

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See detailRobustness and efficiency of multivariate coefficients of variation
Aerts, Stéphanie; Haesbroeck, Gentiane; Ruwet, Christel

Conference (2014, August 12)

The coefficient of variation is a well-known measure used in many fields to compare the variability of a variable in several populations. However, when the dimension is greater than one, comparing the...

See detailA bi-objective model for intermodal transport
Mostert, Martine; Limbourg, Sabine

in ILS 2014 Proceedings (2014, August)

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See detailRelaxations for multi-period optimal power flow problems with discrete decision variables
Gemine, Quentin; Ernst, Damien; Louveaux, Quentin; Cornélusse, Bertrand

in Proceedings of the 18th Power Systems Computation Conference (PSCC'14) (2014, August)

We consider a class of optimal power flow (OPF) applications where some loads offer a modulation service in exchange for an activation fee. These applications can be modeled as multi-period formulatio...

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See detailA quantitative analysis of the effect of flexible loads on reserve markets
Mathieu, Sébastien; Louveaux, Quentin; Ernst, Damien; Cornélusse, Bertrand

in Proceedings of the 18th Power Systems Computation Conference (PSCC) (2014, August)

We propose and analyze a day-ahead reserve market model that handles bids from flexible loads. This pool market model takes into account the fact that a load modulation in one direction must usually b...

See detailA Bi-Objective Location-Allocation Model for Intermodal Terminals
Mostert, Martine; Caris, An; Limbourg, Sabine

Conference (2014, July 18)

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See detailSpecific Multi-trip Operators for Vehicle Routing Problems
Arda, Yasemin; Crama, Yves; François, Véronique; Laporte, Gilbert

Conference (2014, July 17)

In vehicle routing problems with multiple trips (VRPM), each vehicle is allowed to perform more than one trip during its working period. Classical solution techniques for this problem use existing VRP...

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See detailInventory-routing problem with pickups and deliveries of RTI in closed-loop supply chain
Iassinovskaia, Galina; Limbourg, Sabine; Riane, Fouad

Conference (2014, July 17)

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their Returnable Transport Items (RTIs) among different partners of a...

See detailA General Lotsizing and Scheduling Problem with Stochastic Product Returns
Amand, Guillaume; Arda, Yasemin

Conference (2014, July 15)

We consider a multi-product capacitated lotsizing and scheduling problem with sequence-dependent setups and stochastic product returns. The returned products accumulate in an input inventory and can b...

See detailVehicle routing problems with multiple trips: using specific local search operators
Arda, Yasemin; Crama, Yves; François, Véronique; Laporte, Gilbert

Conference (2014, June 25)

In vehicle routing problems with multiple trips (VRPM), each vehicle is allowed to perform more than one trip during its working period. Classical solution techniques for this problem make use of exis...

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See detailMulti-period vehicle assignment with stochastic load availability
Pironet, Thierry

Conference (2014, June 23)

This work investigates optimization techniques for a vehicle-load assignment problem. A company owning a limited fleet of vehicles wants to maximize its operational profit over an infinite horizon div...

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See detailService Start Time Optimization in Elementary Shortest Path Problems with Resource Constraints
Arda, Yasemin; Kucukaydin, Hande; Crama, Yves

Scientific conference (2014, June 12)

Besides their real-life applications, elementary shortest path problems with resource constraints are faced as the pricing sub-problem when more complex problems are solved through column generation a...

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See detailThe application of the NSGA-II optimization method in designing control charts
Faraz, Alireza; Heuchenne, Cédric; Seif, Asghar

Conference (2014, June 04)

The problem of designing control chart is formulated as a multi-objective optimization problem with the adjusted average time to signal as the statistical objective and the expected cost per hour as t...

See detailIntegrating axle weight restrictions in a two-dimensional vehicle routing problem with sequence based loading
Pollaris, Hanne; Braekers, Kris; Caris, An; Janssens, Gerrit; Limbourg, Sabine

Scientific conference (2014, June)

A mixed integer linear programming model for a two-dimensional capacitated vehicle routing problem (2L-CVRP) with sequence based loading and axle weight restrictions is provided. To the authors’ kno...

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See detailOn the importance of Quality, Liquidity Level and Liquidity Risk: A Markov-Switching Regime Approach
Bazgour, Tarik; Sougné, Danielle; Heuchenne, Cédric

Conference (2014, May 23)

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See detailDetection of non concave and non increasing multifractal spectra using wavelet leaders (Part II)
Kleyntssens, Thomas; Esser, Céline; Nicolay, Samuel

Conference (2014, May 22)

This talk follows "Detection of non concave and non increasing multifractal spectra using wavelet leaders (Part I)" given by Céline Esser. A multifractal formalism is a numerically computab...

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See detailDetection of non concave and non increasing multifractal spectra using wavelet leaders (Part I)
Esser, Céline; Kleyntssens, Thomas; Bastin, Françoise; Nicolay, Samuel

Conference (2014, May 22)

Multifractal analysis is concerned with the study of very irregular signals. For such functions, the pointwise regularity may change widely from a point to another. Therefore, it is more interesting t...

See detailA 'price balance statistic' for optimizing pricing strategies: a better estimation of elasticities and cross-elasticities
Lurkin, Virginie; Schyns, Michael; Garrow, Laurie A.; Jacobs, Timothy L.

Conference (2014, May 16)

Demand forecasting, price optimization and capacity controls form three major tools of revenue management. Over the past few decades, each discipline has generated a great deal of research but has typ...

See detailA 'price balance statistic' for optimizing pricing strategies: a better estimation of elasticities and cross-elasticities
Lurkin, Virginie; Schyns, Michael; Garrow, Laurie A.; Jacobs, Timothy L.

Conference (2014, May 15)

Demand forecasting, price optimization and capacity controls form three major tools of revenue management. Over the past few decades, each discipline has generated a great deal of research but has typ...

See detailAbout almost periodic sequences of integers and related concepts
Crama, Yves

Scientific conference (2014, May 07)

See detailHow to locate intermodal terminals for achieving economic and environmental competitiveness?
Mostert, Martine; Limbourg, Sabine

Conference (2014, April 25)

Europe has a strong commitment to the development of competitive and sustainable transportation. An intermediate objective cited in the “White Paper” is to shift 30% of 300 km and above road freig...

See detailLogistics hub: the case of Liège
Limbourg, Sabine; Mostert, Martine; Paquay, Célia

Conference (2014, April 24)

A logistics hub can be defined as a specific area where all the activities relating to transport, logistics and goods distribution are carried out. With its central location in Europe, highly develope...

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See detailA new methodological approach for error distributions selection in Finance
Hambuckers, julien; Heuchenne, Cédric

Conference (2014, April)

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the tradit...

See detailCompact quadratizations of nonlinear binary optimization problems
Crama, Yves; Rodriguez Heck, Elisabeth

Conference (2014, March 25)

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See detailA new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part II)
Kleyntssens, Thomas; Esser, Céline; Nicolay, Samuel

Conference (2014, March 25)

This talk follows "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part I)" given by Céline Esser. For real-life signals, it is i...

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See detailA new multifractal formalism based on wavelet leaders : detection of non concave and non increasing spectra (Part I)
Esser, Céline; Kleyntssens, Thomas; Nicolay, Samuel; Bastin, Françoise

Conference (2014, March 25)

Multifractal analysis is concerned with the study of very irregular signals. For such functions, the pointwise regularity may change widely from a point to another. Therefore, it is more interesting t...

See detailMonitoring Delivery Networks in supply chains
Faraz, Alireza

Conference (2014, March 14)

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See detailMulti-period vehicle assignment with stochastic load availability
Pironet, Thierry

Conference (2014, February 27)

This work investigates optimization techniques for a vehicle-load assignment problem. A company owning a limited fleet of vehicles wants to maximize its operational profit over an infinite horizon div...

See detailAn exact bi-directional dynamic programming algorithm for an elementary shortest path problem with variable service start time
Arda, Yasemin; Crama, Yves; Kucukaydin, Hande

Conference (2014, January 31)

We consider an elementary shortest path problem with resource constraints (ESPPRC), where a capacitated single vehicle serves customers by respecting their associated time windows. The vehicle can sta...

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See detailMulti-period vehicle assignment with stochastic load availability
Pironet, Thierry

Conference (2014, January 31)

We investigate the following problem, which is faced by major forwarding companies active in road transportation (see [2]). A company owning a limited fl eet of vehicles wants to maximize its operatio...

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See detailA relax-and- fix heuristic for the three-dimensional bin-packing model with transportation constraints
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

Conference (2014, January 30)

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See detailEarly detection of university students in potential difficulty
Hoffait, Anne-Sophie; Schyns, Michael

Conference (2014, January)

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. Bu...

See detailA constructive heuristic for the three dimensional Bin Packing Problem with transportation constraints
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

Conference (2014)

The aim of this work is to propose a Relax-And-Fix heuristic to build a good initial solution to the 3D BPP. First, a mathematical formulation has been developed taking into account several types of c...

See detailA relax-and- fix heuristic for the three-dimensional bin-packing model with transportation constraints
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

in 11th ESICUP Meeting proceedings (2014)

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See detailClimatological influences on inland waterway transport capacity
Cools, Mario; Limbourg, Sabine

Conference (2014)

Climate change may affect inland waterway transport through disturbances in waterway hydrology: longer periods with strong water swells and drops. To allow fully loaded barges, the water level must be...

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See detailLipschitz robust control from off-policy trajectories
Fonteneau, Raphaël; Ernst, Damien; Boigelot, Bernard; Louveaux, Quentin

in Proceedings of the 53rd IEEE Conference on Decision and Control (IEEE CDC 2014) (2014)

We study the minmax optimization problem introduced in [Fonteneau et al. (2011), ``Towards min max reinforcement learning'', Springer CCIS, vol. 129, pp. 61-77] for computing control policies for batc...

See detailA new methodological approach for error distributions selection
Hambuckers, julien; Heuchenne, Cédric

Conference (2013, December 15)

Since 2008 and its financial crisis, an increasing attention has been devoted to the selection of an adequate error distribution in risk models, in particular for Value-at-Risk (VaR) predictions. We ...

See detailA new methodological approach for error distributions selection
Hambuckers, julien; Heuchenne, Cédric

Scientific conference (2013, November)

Since 2008 and its financial crisis, an increasing attention has been devoted to the selection of an adequate error distribution in risk models, in particular for Value-at-Risk (VaR) predictions. We ...

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See detailSnu Spaces, from Theory to Practice
Kleyntssens, Thomas; Nicolay, Samuel

Poster (2013, October 29)

Computing the spectrum of singularities of a real-life signal by using the definition is impossible. One rather uses an indirect way to compute it: the multifractal formalism. The first multifractal f...

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See detailAn efficient algorithm for the provision of a day-ahead modulation service by a load aggregator
Mathieu, Sébastien; Ernst, Damien; Louveaux, Quentin

in Proceedings of the 4th European Innovative Smart Grid Technologies (ISGT) (2013, October)

This article studies a decision making problem faced by an aggregator willing to offer a load modulation service to a Transmission System Operator. This service is contracted one day ahead and consist...

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See detailEmpty Container Management in the Benelux Waterways
Salmon, Frédéric; Limbourg, Sabine

in Pianic Smart Rivers 213 (2013, September 25)

The scientific contribution of this paper is the development of a model for empty container management in the hinterlands of the ports of Antwerp and Rotterdam. The objective of the proposed model is ...

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See detailMise en oeuvre du formalisme multifractal sur les espaces Snu
Kleyntssens, Thomas; Nicolay, Samuel

Conference (2013, September 24)

When considering very irregular functions, it does not make sense to try to characterize the pointwise irregularity because it can change from one point to another. It is more interesting to compute t...

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See detailImplementation of the Multifractal Formalism on Snu Spaces
Kleyntssens, Thomas; Nicolay, Samuel

Conference (2013, September 09)

A multifractal formalism is a formula, numerically computable, which approximate the spectrum of singularities of a function. The first multifractal formalism (Frisch and Parisi, 1985) has the main de...

See detailCharacteristics of Economically Designed CUSUM and \bar{X} Control Charts
Saniga, Erwin; Davis, Darwin; Faraz, Alireza; McWilliams, Thomas; Lucas, James

Conference (2013, August 22)

In this paper we investigate the characteristics of economic control chart designs for both Shewhart (¯X ) and CUSUM control charts. Authors in the past have made some suggestions regarding the desig...

See detailDynamic Accelerated Failure Time Model with Endogeneity and Heterogeneity: a Control Function approach
Tiwari, Amaresh Kumar; Heuchenne, Cédric

Conference (2013, August)

We develop a control function method to estimate an Accelerated Failure Time (AFT) model with multiple states, where we account for state dependence, heterogeneity, and endogeneity of covariates. In a...

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See detailThe Airline Container Loading Problem with Pickup & Delivery and Multi Doors
Schyns, Michael; Lurkin, Virginie

in 53rd AGIFORS Annual Proceedings 2013: Annual Symposium and Study Group Meeting (2013, August)

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints, including the management of se...

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See detailOptimization of Stochastic Multi-Period Problems in Transportation
Pironet, Thierry

Scientific conference (2013, July 09)

Présentation générale de la méthodologie et des travaux réalisés dans le domaine de l'optimisation de problèmes multi-périodes en transport dans le cadre de la thèse de Th. Pironet...

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See detailDouble-objective Economic Statistical Design of the Adaptive T2 Control Charts
Faraz, Alireza; Heuchenne, Cédric; Saniga, Erwin; Costa, Antonio F.B.

Conference (2013, July 09)

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See detailNeighborhood Search Approaches for a Vehicle Routing Problem with Multiple Trips and Driver Shifts
Arda, Yasemin; Crama, Yves; François, Véronique

Conference (2013, July 08)

See detailOptimization of Service Start Time for an Elementary Shortest Path Problem
Kucukaydin, Hande; Arda, Yasemin; Crama, Yves

Conference (2013, July 08)

We are concerned with an elementary shortest path problem with resource constraints (ESPPRC), where there is a capacitated single vehicle at the depot for serving a set of delivery and backhaul custom...

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See detailGeneral lotsizing in a closed-loop supply chain with uncertain returns
Amand, Guillaume; Arda, Yasemin

Conference (2013, July 03)

We consider a multi-product capacitated lotsizing and scheduling prob- lem with sequence-dependent setups and stochastic product returns. The returned products accumulate in an input inventory and can...

See detailA two-stage stochastic programming model for a comprehensive disaster management problem
Döyen, Alper; Arda, Yasemin

Conference (2013, July 03)

A periodic disaster preparedness model that incorporates mitigation, response, and recovery related decisions is proposed. The objective is to minimize the total cost of relief item transportation and...

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See detailThe Airline Container Loading Problem with Pickup and Delivery
Lurkin, Virginie; Schyns, Michael

Conference (2013, July 02)

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints. The originality of our approac...

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See detailA global optimization method for naval structure op- timization
Bay, Maud; Crama, Yves; Rigo, Philippe

Conference (2013, July 01)

The paper proposes a global optimization method for the preliminary structural design of large vessels in shipbuilding industry. We face a combinatorial problem of large size, with constraints modeled...

See detailQuadratic reformulations of nonlinear binary optimization problems
Crama, Yves

Conference (2013, July 01)

We consider the problem of minimizing a pseudo-Boolean function f(x), i.e., a real-valued function of 0-1 variables. Several authors have recently proposed to reduce this problem to the quadratic case...

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See detailAn exact formulation for the three-dimensional bin-packing with transportation constraints
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

Conference (2013, July)

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See detailA branch and price approach for an airport vehicle routing problem
Schyns, Michael

Conference (2013, July)

This project has been initiated by a main European freight airport. The goal is to optimize the aircraft refueling process which relies on a given set of trucks. The underlying process can be defined ...

See detailQuadratization of pseudo-Boolean functions
Crama, Yves

Scientific conference (2013, June 20)

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See detailStochastic Optimization in Multi-periods problems in Transportation
Pironet, Thierry

Scientific conference (2013, June 13)

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See detailConditional Asset Allocation: Does Market Wide liquidity Matter?
Bazgour, Tarik; Sougné, Danielle; Heuchenne, Cédric

Scientific conference (2013, June)

See detailDetermination of activation yields for fusion plasma escaping charged particles diagnostics
Chene, Grégoire; Bonheure, George; Delvigne, Thierry; Delhalle, René; Strivay, David

Conference (2013, June)

See detailDetermination of activation yield curves for fusion escaping particle diagnostics
Strivay, David; Bonheure, George; Delvigne, Thierry; Delhalle, René; Chene, Grégoire

Conference (2013, June)

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See detailThe economic and environmental feasibility of biogas buses in Liege
Mostert, Martine; Limbourg, Sabine

in 2013 BIVEC-GIBET Transport Research Days - Proceedings (2013, May 30)

Everyday, many students at the University of Liège have to drive to the Sart-Tilman village to attend their courses. These journeys are responsible for the emission of harmful particles which have ne...

See detailMonitoring distribution networks in supply chains
Faraz, Alireza

Conference (2013, May 17)

This paper presents a new control chart for monitoring the post optimality of a designed distribution network in a supply chain. The proposed control chart alarms as soon as neither the location nor t...

See detailAn elementary shortest path problem with variable service start time
Kucukaydin, Hande; Arda, Yasemin; Crama, Yves

Conference (2013, May 02)

We consider an elementary shortest path problem with resource constraints (ESPPRC), where a capacitated single vehicle serves a set of delivery and backhaul customers with a revenue and a time window....

See detailNew issues for the Goodness-of-fit test of the error distribution : a comparison between Sinh-arscinh and Generalized Hyperbolic distribution
Hambuckers, julien; Heuchenne, Cédric

Conference (2013, April 30)

In this article, we consider a multiplicative heteroskedastic structure of financial returns and propose a methodology to study the goodness-of-fit of the error distribution. We use non-conventional e...

See detailNew issues for the Goodness-of-fit test of the error distribution : a comparison between Sinh-arcsinh and Generalized Hyperbolic distributions
Hambuckers, julien; Heuchenne, Cédric

Conference (2013, April 19)

In this article, we consider a multiplicative heteroskedastic structure of financial returns and propose a methodology to study the goodness-of-fit of the error distribution. We use non-conventional e...

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See detailConditional Asset Allocation: Does Market Wide liquidity Matter?
Bazgour, Tarik; Sougné, Danielle; Heuchenne, Cédric

Scientific conference (2013, April 17)

See detailBranch-and-price: principles and its application to a 2-period vehicle routing problem
Rezaei Sadrabadi, Mahmood

Scientific conference (2013, April 05)

We review branch-and-price as an efficient algorithm to solve integer programming problems with huge number of variables. In particular, we discuss column generation algorithm as the main engine in br...

See detailBranch-and-price: principles and its application to a 2-period vehicle routing problem
Rezaei Sadrabadi, Mahmood

Scientific conference (2013, April 05)

We review branch-and-price as an efficient algorithm to solve integer programming problems with huge number of variables. In particular, we discuss column generation algorithm as the main engine in br...

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See detailQuadratization of symmetric pseudo-Boolean functions
Crama, Yves

Conference (2013, April)

We consider the problem of minimizing an arbitrary pseudo-Boolean function f(x), that is, a real-valued function of 0-1 variables. In recent years, several authors have proposed to reduce this problem...

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See detailAutomatic Aircraft Cargo Load Planning with Pick-up and Delivery
Lurkin, Virginie; Schyns, Michael

Conference (2013, March 15)

This research aims to develop a new mixed integer linear program to solve the containers assignment problem when pickup and deliveries are considered. Given a pool of ULDs and an aircraft with multipl...

See detailBranch-and-price: principles and its application to a 2-period vehicle routing problem
Rezaei Sadrabadi, Mahmood

Scientific conference (2013, March 07)

We review branch-and-price as an efficient algorithm to solve integer programming problems with huge number of variables. In particular, we discuss column generation algorithm as the main engine in br...

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See detailConditional Asset Allocation: Does Market Wide liquidity Matter?
Bazgour, Tarik; Sougné, Danielle; Heuchenne, Cédric

Scientific conference (2013, March 07)

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See detailElective Course Allocation with numerical preferences
Bay, Maud; Homburg, David

Conference (2013, February 14)

In Universities, students have to select a specified number of elective courses to be included in their curriculum. Elective courses are a good way to increase students motivation and improve their ac...

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See detailAn adaptive large neighborhood search for a vehicle routing problem with multiple trips and driver shifts
Arda, Yasemin; Crama, Yves; François, Véronique

Conference (2013, February 13)

This study analyzes a rich vehicle routing problem with multiple trips and driver shifts. The considered problem features are inspired from the practical case of a Belgian distribution company. Along ...

See detailElementary shortest path problems for a multiple-trip vehicle routing problem
Arda, Yasemin; Crama, Yves; Kucukaydin, Hande

Conference (2013, February 08)

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See detailA general lot-sizing problem in a closed-loop supply chain with returns
Amand, Guillaume; Arda, Yasemin

Conference (2013, February 08)

We consider a stochastic version of the multi-product multi-level capacitated lotsizing and scheduling problem with sequence-dependent setups. A bottler needs to determine its production schedule over...

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See detailMultiperiod vehicle loading with stochastic release dates
Pironet, Thierry

Conference (2013, February 08)

See detailTwo-stage stochastic integer programming models for strategic disaster preparedness
Döyen, Alper; Aras, Necati; Arda, Yasemin

Conference (2013, February 08)

We are interested in two distinct disaster management models which are modeled by two-stage stochastic integer programming. While the first model solution provides optimal post-disaster response relat...

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See detailAn adaptive large neighborhood search for a vehicle routing problem with multiple trips and driver shifts
Arda, Yasemin; Crama, Yves; François, Véronique

Conference (2013, February 07)

See detailOptimization model for empty container repositioning
Salmon, Frédéric; Limbourg, Sabine

Scientific conference (2013, February 07)

Empty container management is a transportation issue relating to the imbalance of container demand and supply. This project aims at minimizing the overall cost of empty container management. It takes ...

See detailAutomatic Aircraft Cargo Load Planning with Pick-up and Delivery
Lurkin, Virginie; Schyns, Michael

Conference (2013, February 07)

This research aims to develop a new mixed integer linear program to solve the containers assignment problem when pickup and deliveries are considered. Given a pool of ULDs and an aircraft with multipl...

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See detailIntermodal network design for freight transportation in Belgium - location of rail/road and road/inland waterway terminals
Mostert, Martine; Limbourg, Sabine

Conference (2013, February 07)

In the recent years, growing concerns about environmental, societal and economic issues have emerged in the society. The improvement and the expansion of the multimodal network is one way of solving t...

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See detailOptimization model for empty container repositioning
Salmon, Frédéric; Limbourg, Sabine

Conference (2013, February 07)

Empty container management is a transportation issue relating to the imbalance of container demand and supply in various parts of the world. Hence the necessity for shippers to move empty containers t...

See detailMéthodes Booléennes en recherche opérationnelle
Crama, Yves

Conference (2013, February)

Le titre de cette conférence est celui d'une monographie cosignée par Peter L. Hammer et Sergiu Rudeanu, et dont la publication en 1968 a inspiré un nombre important de travaux de recherche. Très ...

See detailAlgorithmes d'approximation pour les problèmes d'affectation multidimensionnels
Crama, Yves

Scientific conference (2013, January)

Le problème d'affectation multidimensionnel (PAM) consiste à partitionner les sommets d'un graphe m-parti en m-cliques disjointes de façon à minimiser la somme des coûts des cliques utilisées, o...

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See detailGénéralisation Min Max pour l'Apprentissage par Renforcement Batch et Déterministe : Relaxations pour le Cas Général T Etapes
Fonteneau, Raphaël; Ernst, Damien; Boigelot, Bernard; Louveaux, Quentin

in 8èmes Journées Francophones de Planification, Décision et Apprentissage pour la conduite de systèmes (JFPDA'13) (2013)

Cet article aborde le problème de généralisation minmax dans le cadre de l'apprentissage par renforcement batch et déterministe. Le problème a été originellement introduit par [Fonteneau, 2011]...

See detailSimulation Gaming and Natural Language Processing for Modelling Stakeholder Behavior in Energy Investments
Ittoo, Ashwin; Szirbik, Nick; Huitema, Georges; Wortmann, Hans

in ICS'2013 Proceedings (2013)

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See detailIntegration of Inland Waterway Transport in the Intermodal Supply Chain: a Joint Research Agenda
Caris, An; Limbourg, Sabine; Macharis, Cathy; Van Lier, Tom; Cools, Mario

in Rigo, Philippe; Wolters, Milou (Eds.) Proceedings of the PIANC SMART Rivers Conference 2013 (2013)

This paper identifies research opportunities which will enable the further integration of inland waterway transport in the intermodal supply chain. Intermodal transport may be interpreted as a chain o...

See detailNonparametric regression with right-censored and generalized selection biased data
Heuchenne, Cédric; Laurent, Géraldine

Conference (2012, December 02)

See detailAlgorithms for testing the collective consumption model
Talla Nobibon, Fabrice; Cherchye, Laurens; Crama, Yves; Demuynck, Thomas; De Rock, Bram; Spieksma, Frits

Conference (2012, November 09)

In this talk, we discuss an extension of the strong axiom of revealed preferences to collective households. The question that we address is whether a set of observed consumption baskets can be decompo...

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See detailError distribution estimation in nonparametric regression with right censored selection biased data
Laurent, Géraldine; Heuchenne, Cédric

Conference (2012, October 25)

In this presentation, we study the nonparametric regression model Y = m(X) +sigma(X) * epsilon where the error epsilon, with unknown distribution, is independent of the covariate X, and m(X) = E[Y|X] ...

See detailComments to 'The time inconsistency factor: how banks adapt to their savers mix' (C. Laureti and A. Szafarz, working paper, 2012)
Hambuckers, julien

Scientific conference (2012, October 23)

Comments about 'The time-Inconsistency Factor: How banks adapt to their savers Mix' by C. Laureti and A. Szafarz (working paper, 2012)....

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See detailInland intermodal freight transport modelling
Carreira, Joana; Santos, Bruno; Limbourg, Sabine

in ETC Proceedings (2012, October 10)

The demand for goods has grown in the past decades, in such a way that today freight transport has become essential for the support of modern economies. The search for a competitive freight transport ...

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See detailA computationally efficient algorithm for the provision of a day-ahead modulation service by a load aggregator
Mathieu, Sébastien; Karangelos, Efthymios; Louveaux, Quentin; Ernst, Damien

Poster (2012, October 08)

We study a decision making problem faced by an aggregator willing to offer a load modulation service to a Transmission System Operator (TSO). In particular, we concentrate on a day-ahead service consi...

See detailConditional Asset Allocation: Does Market-Wide Liquidity Matter?
Sougné, Danielle; Heuchenne, Cédric; Bazgour, Tarik

Conference (2012, September 19)

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See detailError distribution function for parametrically truncated and censored data
Laurent, Géraldine; Heuchenne, Cédric

Conference (2012, September 14)

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See detailThe sensitivity of optimal rail‐road terminal locations to intermodal freight costs variations
Carreira, Joana; Santos, Bruno; Limbourg, Sabine

Conference (2012, September 05)

In the last decades, the market of goods became globalized, increasing international trade relations and the demand for long distance transportation. As a consequence of the larger distances traveled ...

See detailFusion alpha and proton diagnostics by thin layer activation
Chene, Grégoire; Bonheure, George; Delhalle, René; Strivay, David

Conference (2012, September)

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See detailAutomatic Cargo Load Planning: Special shipments
Kleyntssens, Thomas; Limbourg, Sabine; Schyns, Michael

in ILS 2012 Proceedings (2012, August 28)

The aircraft loading problem is a real-world combinatorial optimisation problem highly constrained. Indeed, loading the aircraft so the gross weight is less than the maximum allowable is not enough. T...

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See detailNetwork design model for intermodal transport: the case of the hinterland of the Port of Cotonou
Lihoussou, Messan; Limbourg, Sabine

in ILS 2012 Proceeding (2012, August 27)

Since 2006, the Millennium Challenge Account program subsidizes a project to improve the performance of the Port of Cotonou, through modernization of infrastructure and management systems, and strengt...

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See detailThree dimensional Bin Packing Problem applied to air cargo
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

in ILS 2012 Proceedings (2012, August 26)

Deciding whether a set of three dimensional boxes can be packed into a container is a NP-hard problem. Mathematical models have been developed, however, only few studies take into account constraints ...

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See detailAsymptotic properties of the error distribution estimation in right censored and selection biased regression models
Laurent, Géraldine; Heuchenne, Cédric

Conference (2012, June 16)

Suppose the random vector (X,Y) satisfies the nonparametric regression model Y=m(X)+sigma(X)*epsilon where m(X) =E [Y|X] and sigma^2(X) = Var [Y|X] are unknown smooth functions and the error epsilon, ...

See detailBoolean Methods and Logical Analysis of Data
Crama, Yves

Conference (2012, June 09)

About 20 years ago, we proposed an innovative approach to data mining based on a blend of Boolean techniques and combinatorial optimization. The basic tenets of this approach were presented in a joint...

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See detailMultiperiod vehicle loading with stochastic release dates
Arda, Yasemin; Crama, Yves; Kronus, David; Pironet, Thierry; Van Hentenryck, Pascal

Conference (2012, May 24)

Production scheduling and vehicle routing problems are well-known topics in operations management. Although these tasks are consecutive in the supply chain, few optimization models tackle the associat...

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See detailIntermodal transportation network design under uncertainty: case of the hinterland of the Port of Cotonou
Lihoussou, Messan; Limbourg, Sabine

Scientific conference (2012, May 21)

Since 2006, the Millennium Challenge Account program subsidizes a project to improve the performance of the Port of Cotonou, through modernization of infrastructure and management systems, and strengt...

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See detailGénéralisation min max pour l'apprentissage par renforcement batch et déterministe : schémas de relaxation
Fonteneau, Raphaël; Ernst, Damien; Boigelot, Bernard; Louveaux, Quentin

in Septièmes Journées Francophones de Planification, Décision et Apprentissage pour la conduite de systèmes (JFPDA 2012) (2012, May)

On s’intéresse au problème de généralisation min max dans le cadre de l’apprentissage par renforcement batch et déterministe. Le problème a été originellement introduit par Fonteneau et al...

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See detailOptimisation 3D du chargement de conteneurs pour le transport aérien
Paquay, Célia; Limbourg, Sabine; Schyns, Michael

in LigéRO (Ed.) Proceedings ROADEF 2013 (2012, April 11)

De nos jours, décider comment remplir des conteneurs avec des colis est une activité courante aussi bien dans le domaine du transport routier qu’aérien. Ce type de question est apparentée aux pr...

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See detailChargement de marchandises dans un avion cargo: le cas des marchandises nécessitant des précautions particulières
Schyns, Michael; Limbourg, Sabine; Kleyntssens, Thomas

Conference (2012, April)

D'une part, les entreprises de transport aérien ont acheminé en 2010 plus d’un tiers de la valeur des exportations mondiales. D'autre part, le chargement des avions est une opération complexe sou...

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See detailSome Applications of Mathematical Statistics in Management
Heuchenne, Cédric

Scientific conference (2012, March)

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See detailThree dimensional Bin Packing Problem applied to air transport
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

Conference (2012, February 02)

Packing boxes into containers is a daily process in many di erent elds and especially in transport. However, the particular case of air transport brings some new constraints such as the stability or t...

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See detailAn Integer Programming model for air transport of hazardous and special shipments
Kleyntssens, Thomas; Limbourg, Sabine; Schyns, Michael

Conference (2012, February 02)

The aircraft loading problem is a real-world combinatorial optimisation problem highly constrained. This weight must be distributed to keep the centre of gravity within speci ed limits. Moreover, an a...

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See detailHybrid Tabu Search Heuristics for a Bilevel Competitive Facility Location Model
Kucukaydin, Hande; Aras, Necati; Altinel, I. Kuban

Conference (2012, February 02)

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See detailA modified economic-statistical design of the VP multivariate control charts
SEIF, Asghar; Faraz, Alireza

Conference (2012, January 15)

Hotelling’s T2 control chart is one of the most popular multivariate control charts for monitoring multiple variables simultaneously. Recent studies have shown that applying the T2 control chart by ...

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See detailA Rich Vehicle Routing Problem with Multiple Trips and Driver Shifts
Arda, Yasemin; Crama, Yves; Kucukaydin, Hande; Talla Nobibon, Fabrice

Conference (2012)

This study is concerned with a rich vehicle routing problem (RVRP) encountered at a Belgian transportation company in charge of servicing supermarkets and hypermarkets belonging to a franchise. The st...

See detailEstimation under left parametric truncation and right censoring
Heuchenne, Cédric; Laurent, Géraldine

Scientific conference (2012)

See detailEstimation under left parametric truncation and right censoring
Heuchenne, Cédric; Laurent, Géraldine

Scientific conference (2012)

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See detailThree Dimensional Bin Packing Problem applied to air cargo
Paquay, Célia; Schyns, Michael; Limbourg, Sabine

Scientific conference (2011, December 15)

Deciding whether a set of three dimensional boxes can be packed into a container is a NP-hard problem. Mathematical models have been developed, however, only few studies take into account constraints ...

Full Text
See detailChargement d’un avion cargo : le cas des marchandises nécessitant des précautions particulières
Kleyntssens, Thomas; Limbourg, Sabine; Schyns, Michael

Conference (2011, December 15)

Le problème du chargement de marchandises dans un avion cargo est soumis à des contraintes strictes de sécurité. C’est un problème d’optimisation combinatoire d’une importance cruciale pour...

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See detailThe Economic and Statistical Designs of Control charts for Censored and Non-Normal Data
Faraz, Alireza; Heuchenne, Cédric; Davis, Darwin, Edward; Saniga, Erwin

Scientific conference (2011, December)

In this research, we are dealing with constructing the statistical design (SD) and economic statistical design (ESD) of Shewhart and CUSUM control charts for reliability data which are right censored....

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See detailRelaxation schemes for min max generalization in deterministic batch mode reinforcement learning
Fonteneau, Raphaël; Ernst, Damien; Boigelot, Bernard; Louveaux, Quentin

in 4th International NIPS Workshop on Optimization for Machine Learning (OPT 2011) (2011, December)

We study the min max optimization problem introduced in [Fonteneau, 2011] for computing policies for batch mode reinforcement learning in a deterministic setting. This problem is NP-hard. We focus on ...

See detailQuantile regression in nonparametric location-scale models with censored data
Heuchenne, Cédric; Van Keilegom, Ingrid

Conference (2011, December)

See detailTesting for one-sided alternatives in nonparametric censored regression
Heuchenne, Cédric; Pardo Fernandez, Juan Carlos

Conference (2011, December)

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See detailEstimation of the Error Distribution in a Semiparametric Transformation Model
Heuchenne, Cédric; Samb, Rawane; Van Keilegom, Ingrid

Scientific conference (2011, November 15)

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See detailTesting for one-sided alternatives in nonparametric censored regression
Heuchenne, Cédric; Pardo Fernandez, Juan Carlos

Scientific conference (2011, November 09)

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See detailBoolean methods in operations research and related areas
Crama, Yves

Conference (2011, November)

These are the slides of the "IFORS Distinguished Lecture" that I delivered at the INFORMS Annual meeting in November 2011. The title of the lecture is the title of a monograph co-authored by...

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See detailMULTIOBJECTIVE DESIGN OF CONTROL CHARTS
Faraz, Alireza; Heuchenne, Cédric

Conference (2011, September 24)

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See detailMonitoring delivery chains in a supply chain using multivariate control charts
Faraz, Alireza; Heuchenne, Cédric; Saniga, Erwin; Foster, Earnest

Conference (2011, July 13)

The theory of the delivery chain considers the delivery of goods and services to customers within a specific time interval. Nowadays, organizations are focusing to satisfy their customers’ demands n...

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See detailA capacity game in transportation management
Amand, Guillaume; Arda, Yasemin

Conference (2011, July 10)

This study analyzes the contractual relation between a retailer and a carrier with the aim of determining possible deviations from the optimal system performance. In order to face a random demand, the...

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See detailError distribution estimation in right censored and selection biased location-scale models
Laurent, Géraldine; Heuchenne, Cédric

Poster (2011, June 23)

Suppose the random vector (X;Y) satis es the regression model Y = m(X)+sigma(X)*epsilon where m(X) = E[Y|X] and sigma²(X) = Var[Y|X] are unknown smooth functions and the error epsilon, with unknown d...

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See detailNonparametric regression with parametric selection bias
Heuchenne, Cédric; Laurent, Géraldine

in Proceedings of the 14th Conference of the ASMDA International Society (ASMDA2011) (2011, June)

See detailControl and Voting Power in Complex Shareholding Networks
Crama, Yves; Leruth, Luc; Su Wang

Conference (2011, June)

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See detailAutomatic Cargo Load Planning: Special shipments
Limbourg, Sabine; Schyns, Michael

Scientific conference (2011, May 25)

The aircraft loading problem is a real-world combinatorial optimisation problem highly constrained. Indeed, loading the aircraft so the gross weight is less than the maximum allowable is not enough. T...

See detailIntermodal transportation network design for the hinterland of the hinterland of the Port of Cotonou
Lihoussou, Messan; Limbourg, Sabine

in Cornelis, Eric (Ed.) Proceedings of the BIVEC-GIBET Transport Research Day 2011 (2011, May 25)

Since 2006, the Millennium Challenge Account program subsidizes a project to improve the performance of the Port of Cotonou, through modernization of infrastructure and management systems, and strengt...

See detailAircraft Cargo AutoLoad
Schyns, Michael; Limbourg, Sabine

Conference (2011, May)

See detailPlanification automatique de chargements d'avions cargo
Limbourg, Sabine; Schyns, Michael

Scientific conference (2011, April 18)

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See detailMultiperiod vehicle loading optimization with stochastic supply
Amand, Guillaume; Arda, Yasemin; Crama, Yves; Kronus, David; Pironet, Thierry

Scientific conference (2011, April 07)

See detailIdentification du profil du consommateur par datamining
Schyns, Michael

Scientific conference (2011, April)

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See detailComplexity results and exact algorithms for robust knapsack problems
Talla Nobibon, Fabrice; Leus, Roel

Scientific conference (2011, March 04)

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See detailA capacity game in transportation management
Amand, Guillaume; Arda, Yasemin

Conference (2011, March 03)

Emerging concerns about competitiveness induce a growing number of firms to outsource their outbound transportation operations to third-party logistics providers. The resulting increase in the number ...

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See detailAutomatic Cargo Load Planning
Limbourg, Sabine; Schyns, Michael; Laporte, Gilbert

in Proceedings (2011, March 02)

The goal of this paper is the development of a new mixed integer linear pro- gram designed for optimally loading a set of containers and pallets into a compartmentalised cargo aircraft. It is based on...

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See detailTesting for one-sided alternatives in nonparametric censored regression
Heuchenne, Cédric; Pardo Fernandez, J. C.

Scientific conference (2011, February 08)

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See detailExtracting explicit and implicit causal relations from sparse, domain-specific texts
Ittoo, Ashwin; Bouma, Gosse

in Lecture Notes in Computer Science (2011)

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See detailOnline Sparse Bandit for Card Games
Lupien St-Pierre, David; Louveaux, Quentin; Teytaud, Olivier

in Advance in Computer Games (2011)

Finding an approximation of a Nash equilibria in matrix games is an important topic that reaches beyond the strict application to matrix games. A bandit algorithm commonly used to approximate a Nash e...

See detailAUTOMATIC CARGO LOAD PLANNING
Limbourg, Sabine

Conference (2010, December 14)

The aircraft loading problem is a real-world combinatorial optimisation problem highly constrained. Indeed, loading the aircraft so the gross weight is less than the maximum allowable is not enough. T...

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See detailIntroduction of the asymptotic study of the estimation of the error distribution in right censored and selection biased regression models
Laurent, Géraldine; Heuchenne, Cédric

Poster (2010, October)

Consider the regression model Y = m(X) + σ(X) Ɛ where m(X) = E[Y|X] and σ²(X)=Var[Y|X] are unknown smooth functions and the error Ɛ , with unknown distribution, is independent of the covariate X....

See detailOperations Research for the steel industry : the art of combining science and knowledge
Crama, Yves; Chevalier, Philippe

Conference (2010, October)

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See detailComputational treatment of the error distribution in nonparametric regression with right-censored and selection-biased data
Laurent, Géraldine; Heuchenne, Cédric

Conference (2010, August 24)

Consider the regression model Y = m(X) + σ(X) Ɛ , where m(X) = E[Y|X] and σ²(X) = Var[Y|X] are unknown smooth functions and the error Ɛ (with unknown distribution) is independent of X. The pair (...

See detailWear study on polymers and bio-materials by ultra thin layer activation
Delhalle, René; Marchal, André; Lucas, S.; Breuer, E.; Delvigne, T.; Van Dievoot, F.; Strivay, David

Poster (2010, August)

See detailA Bilevel Competitive Facility Location Model with Competitor’s Response
Kucukaydin, Hande; Aras, Necati; Altinel, I. Kuban

Conference (2010, July 11)

We are concerned with a problem in which a new entrant leader firm aims at finding the location and attractiveness of each new facility to maximize its profit where there are existing facilities belon...

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See detailSparse Two-Row Cuts and an Algorithm for the Separation Problem
Louveaux, Quentin

Conference (2010, July)

We propose a systematic way to generate sparse cuts from multiple rows of the simplex tableau. We also discuss the question of separation for a multi-row model. To this end, we consideer the polar sys...

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See detailComputational study of the error distribution in right-censored and selection-biased regression models
Laurent, Géraldine; Heuchenne, Cédric

Conference (2010, May 18)

Consider the regression model Y = m(X) + σ(X) Ɛ where m(X) =E [Y|X] and σ²(X) = Var [Y|X] are unknown smooth functions and the error Ɛ, with unknown distribution, is independent of X. The pair (X...

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See detailChallenging Combinatorial Problems
Crama, Yves

Conference (2010, May 06)

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See detailLogical Analysis of Data and Classification
Crama, Yves

Conference (2010, March 25)

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See detailControl and Voting Power in Shareholding Networks
Crama, Yves

Conference (2010, March 18)

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See detailModels for Decision Making: From Applications to Mathematics... and Back
Crama, Yves

Conference (2010, March 15)

In this inaugural lecture, I describe some facets of the interplay between mathematics and management science, economics, or engineering, as they come together in operations research models. I intend ...

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See detailVehicle loading optimization with stochastic supply
Amand, Guillaume; Arda, Yasemin; Crama, Yves; Kronus, David; Pironet, Thierry

Conference (2010, January 29)

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See detailLocation and market area of rail-road terminals
Limbourg, Sabine; Jourquin, Bart

Scientific conference (2010, January 28)

The European transport policy has focused on sustainable transport solutions. One of its objectives for freight transport is to restore the balance between modes and to develop intermodality. Among th...

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See detailA capacity game in transportation planning
Amand, Guillaume; Arda, Yasemin

Conference (2010, January 28)

Emerging concerns about competitiveness induce a growing number of firms to outsource their outbound transportation operations to third-party logistics providers. The resulting increase in the number ...

Full Text
See detailComputational treatment of the error distribution in nonparametric regression with right-censored and selection-biased data
Heuchenne, Cédric; Laurent, Géraldine

in Proceedings of the 19th International Conference on Computational Statistics (2010)

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See detailOn Learning Subtypes of the Part-Whole Relation: Do Not Mix Your Seeds
Ittoo, Ashwin; Bouma, Gosse

in Proceedings of the Association for Computational Linguistics (2010)

See detailA hybrid tabu search heuristic for a bilevel competitive facility location model
Kucukaydin, Hande; Aras, Necati; Altinel, I. Kuban

in Blesa, Maria J.; Blum, Christian; Raidl, Günther; Roli, Andrea; Sampels, Michael (Eds.) Hybrid metaheuristics: 7th International Workshop, HM 2010, Vienna, Austria, October 2010, Proceedings (2010)

We consider a problem in which a firm or franchise enters a market by locating new facilities where there are existing facilities belonging to a competitor. The firm aims at finding the location and a...

See detailAnalysis of thin layers for photovoltaic application: Comparison between RBS and ellipsometry on the determination of roughness and porosity
Mathis, François; Dewalque, Jennifer; Dubreuil, Olivier; Toussaint, Catherine; Delhalle, René; Spronck, Gilles; Colson, Pierre; Cloots, Rudi; Strivay, David

Poster (2010)

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See detailExtracting Meronymy Relationships from Domain-Specific, Textual Corporate Databases
Ittoo, Ashwin; Bouma, Gosse; Maruster, Laura; Wortmann, Hans

in Lecture Notes in Computer Science (2010)

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See detailTextractor: A Framework for Extracting Relevant Domain Concepts from Irregular Corporate Textual Datasets
Ittoo, Ashwin; Maruster, Laura; Wortmann, Hans; Bouma, Gosse

in Lecture Notes in Business Information Processing (2010)

See detailTesting for one-sided alternatives in nonparametric censored curve comparison
Heuchenne, Cédric; Pardo Fernandez, Juan-Carlos

in Proceedings of the 28th European Meeting of Statisticians. (2010)

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See detailSplit rank of two-row cuts
Louveaux, Quentin

Conference (2009, December)

A simple relaxation consisting of two rows of a simplex tableau is a mixed-integer set with two equations, two free integer variables, and nonnegative continuous variables. Recently, Andersen et al. a...

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See detailVehicle loading optimization with stochastic supply
Pironet, Thierry

Scientific conference (2009, November 13)

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See detailEstimation of the error distribution in right censored and selection biased regression models
Laurent, Géraldine; Heuchenne, Cédric

Conference (2009, October 15)

Consider the location-scale regression model Y=m(X) + σ(X) Ɛ where the error Ɛ is independent of the covariate X and where m and σ are unknown smooth functions. The pair (X; Y ) is subject to gene...

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See detailGeometric Study of Mixed-integer Sets from Two Rows of Two Adjacent Simplex Bases
Louveaux, Quentin

Conference (2009, August)

We generalize the study of sets arising from two rows of a simplex tableau by considering bounds on the nonbasic variables. We show that new classes of facets arise that cannot be obtained from triang...

See detailA discrete competitive facility location model with variable attractiveness
Kucukaydin, Hande; Aras, Necati; Altinel, I. Kuban

Conference (2009, July 08)

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant to compete against already existing ones that may belon...

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See detailVehicle loading optimization with stochastic supply
Amand, Guillaume; Arda, Yasemin; Crama, Yves; Kronus, David; Pironet, Thierry

Conference (2009, July 07)

The increased availability of information makes it possible to coordinate processes which are usually functionnally separated in large companies, such as production and transportation. This work inves...

See detailSemiparametric inference in general heteroscedastic regression models.
Heuchenne, Cédric

Scientific conference (2009, June 09)

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See detailAlimentation durable : De la promotion des filières courtes à la promotion d’emplois durables
Ozer, Pierre; Bay, Maud

Scientific conference (2009, March)

Consommation durable ? Le thème de la consommation durable est relativement neuf. Il trouve ses origines au Sommet de la Terre qui s’est tenu en 1992 à Rio de Janeiro. Ce thème part du constat qu...

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See detailEvaluation de projets d’investissement en utilisant la simulation de Monte Carlo
BELAID, Fateh; de Wolf, Daniel

Conference (2009, February 10)

L’exploration et le développement d’un champ pétrolier font face à de nom- breuses incertitudes liées aux rendements et aux coûts tout au long du cycle de vie du pro jet. A titre d’exe...

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See detailSélection du portefeuille de projets d'exploration production en utilisant la méthode de Markowitz
BELAID, Fateh; de Wolf, Daniel

Conference (2009, February 10)

Deux caractéristiques importantes de l’investissement en exploration ou production pétrolière sont les montants financiers très importants en jeu et les incertitudes élevées. Pour ces raisons,...

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See detailUsing OR techniques for projets selection in the petrol industy
BELAID, Fateh; de Wolf, Daniel

Conference (2009, February 05)

Two important characteristics of petroleum exploration and production investment are the high nancial amounts and uncertainties. For these rea- sons, the risk analysis should be implemented in the pro...

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See detailOptimal Design and Dimensioning of Hydrogen Transmission Distribution Pipeline Networks
Andre, Jean; BRAC, Jean; de Wolf, Daniel; Maisonnier, Guy; Ould Sidi, Mohammed; Simonnet, Antoine

Conference (2009, February 05)

This work considers the problem of the optimal design of an hydrogen transmission network. This design problem includes the topology determi- nation and the dimensioning problem. We define a solution ...

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See detailSplit rank of triange and quadrilateral inequalities
Louveaux, Quentin

Conference (2009, January)

A simple relaxation consisting of two rows of a simplex tableau is a mixed-integer set with two equations, two free integer variables, and nonnegative continuous variables. Recently, Andersen et al. a...

See detailMarket area of intermodal rail-road container terminals embedded in a hub-and-spoke network
Limbourg, Sabine

Conference (2009)

This paper presents a methodology able to compare road and rail-road intermodal market areas that takes the network structures, the operation costs and the location of the rail-road terminals into acc...

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See detailDevelopment of an RMS model based on colored object-oriented Petri nets with changeable structures
Zhang, Linda; Ittoo, Ashwin

in IEEE Proceedings of the 16th International Conference on Industrial Engineering and Engineering Management (2009)

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See detailSemiparametric inference in general heteroscedastic regression models
Heuchenne, Cédric; Van Keilegom, Ingrid

in Proceedings of the Sixth Petersburg Workshop on Simulations (2009)

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See detailThe Didam framework Disaggregated demand and assignment models for combined passengers and freight transport
Barthélemy, Johan; Cornelis, Eric; Jourquin, Bart; Limbourg, Sabine; Piotte, Jérémy

Conference (2009)

The objective of this paper is to present the methodological developments in the DIDAM (Disaggregated demand and assignment models for combined passengers and freight transport) research project, whic...

See detailSystèmes d'information de gestion modernes
Schyns, Michael

Scientific conference (2008, December)

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See detailRobust Portfolio Selection
Schyns, Michael

in JSM Proceedings, Statistical Computing Section (2008, November)

In many financial problems, small variations in some inputs may result in big changes in the outputs. In this talk, we consider the problem of portfolio selection as suggested by Markowitz. This model...

See detailLeast-Cost Development of Hydrogen Transmission-Distribution Pipeline Networks
Andre, Jean; Brac, Jean; de Wolf, Daniel; Maisonnier, Guy; Ould Sidi, Mohammed; Simonnet, Antoine

Conference (2008, June)

See detailOptimisation couplée topologie/dimensionnement de réseaux de canalisations
Andre, Jean; Brac, Jean; de Wolf, Daniel; Maisonnier, Guy; Ould Sidi, Mohammed; Simonnet, Antoine

Conference (2008, May)

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See detailVehicle loading from a practical case to a bin-packing approach
Pironet, Thierry

Scientific conference (2008, April 24)

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See detailUn problème de chargement/déchargement profitable d'une flotte de véhicules soumise à des fenêtres de temps
Arda, Yasemin; Crama, Yves; Pironet, Thierry

Conference (2008, February 26)

In most pickup and delivery problems, usually the aim is to minimize either the trip length or duration or the fleet size. Transportation orders or customers are finite sets which should be performed ...

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See detailSolving the gas transmission problem with consideration of the compressors
Bakhouya, Bouchra; de Wolf, Daniel

Conference (2008, February 25)

In [7], De Wolf and Smeers consider the problem of the gas distribution through a network of pipelines. The problem was formulated as a cost minimization subject to nonlinear flow-pressure relations, ...

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See detailA profitable pickup and delivery problem with time windows
Arda, Yasemin; Crama, Yves; Pironet, Thierry

Conference (2008, January 18)

In most pickup and delivery problems, usually the aim is to minimize either the trip length or duration or the fleet size. Transportation orders or customers are finite sets which should be performed ...

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See detailOptimal dimensioning of pipe networks: the new situation when the distribution and the transportation functions are disconnected
Bakhouya, Bouchra; de Wolf, Daniel

Conference (2008, January)

In [9], De Wolf and Smeers consider the problem of the optimal dimensioning of a gas transmission network when the topology of the network is known. The pipe diameters must been chosen to minimize the...

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See detailEvaluation of traffic polluting gases emissions using OR techniques: the case of the city of Tunis
Guirat, Noomen; de Wolf, Daniel

Conference (2008, January)

The purpose of this paper is to show how the operations research techniques can help to evaluate the emissions of polluting gases from road traffic in urban area. Our practical study case is the cente...

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See detailMulticriterion Scantling Optimization of the Midship Section of a Passenger Vessel considering IACS Requirements
Richir, Thomas; Caprace, Jean-David; Losseau, Nicolas; Bay, Maud; Parsons, Michael G.; Patay, Samuel; Rigo, Philippe

in The 10th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS) (2007, October)

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were ma...

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See detailCutting planes and infeasibility certificates from lattice-point-free polyhedra
Louveaux, Quentin

Conference (2007, July)

A central result in the theory of integer optimization states that a system of linear diophantine equations Ax = b has no integral solution if and only if there exists a vector in the dual lattice, yT...

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See detailA mixed-integer heuristic for the structural optimization of a cruise ship
Bay, Maud; Crama, Yves; Richir, Thomas; Rigo, Philippe

in COMPIT 2007 , Cortona, Italy (2007, April 23)

A heuristic approach is proposed to solve the structural optimization problem of a cruise ship. The challenge of optimization is to define the scantling of the structure of a ship in order to minimize...

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See detailCutting planes from lattice-point-free polyhedra
Louveaux, Quentin

Conference (2007, January)

In this talk, we generalize the concept of a split (that leads to split cuts) to any lattice-point-free polyhedron. We show how we can generate cutting planes for a polyhedron from these objects. Asso...

See detailParametric conditional mean and variance testing with censored data
Heuchenne, Cédric; González Manteiga, Wenceslao; Sanchez Sellero, Cesar

in ASMDA2007 Proceedings (2007)

See detailInventory control in a decentralized two-stage make-to-stock queuing system
Arda, Yasemin; HENNET, Jean-Claude

in INCOM 06, 12th IFAC Symposium on Information Control Problems in Manufacturing, Saint-Etienne, France, 17-19 May 2006 (2006, May 17)

In an Enterprise network, several companies interact to produce families of goods. Each member company seeks to optimize his own production and inventory policy to maximize his profit. These objective...

See detailContracting in manufacturing networks with inventories
Arda, Yasemin; Hennet, Jean-Claude

Conference (2006, April 18)

An important issue in the management of supply chains and manufacturing systems is to achieve the desired customer service level while respecting the individual economic objectives of the partners. Th...

See detailCoordination de chaînes logistiques, une approache par la théorie des jeux
Arda, Yasemin; Hennet, Jean-Claude

in MOSIM 06, 6e Conférence Francophone de MOdélisation et SIMulation, Rabat, Maroc, 3-5 Avril 2006 (2006, April 03)

Les chaînes logistiques étudiées sont constituées de différentes entreprises qui interviennent dans le processus de fabrication d’une famille de produits. Pour chaque entreprise, il s’agit pr...

See detailOptimisation d'un contrat de coordination entre producteur et fournissuer
Arda, Yasemin; Hennet, Jean-Claude

Conference (2006, February 06)

Cet article analyse comme un jeu de Stackelberg la négociation d’un contrat au sein d’une chaîne logistique à deux niveaux, qui est constituée de deux étages de production/stockage gérés pa...

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See detailIntermediate integer programming representations using value disjunctions
Louveaux, Quentin

Conference (2006, January)

We introduce a general technique for creating an extended formulation of a mixed-integer program. We classify the integer variables into blocks, each of which generates a finite set of vector values. ...

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See detailInter-modal freight terminal location in Europe: a strategic model
Limbourg, Sabine

Conference (2006)

The political pressure in favour of multi- and inter-modal transport has oriented the focus on sustainable transport solutions. Inter-modal transport is one of the (partial) possible solutions, but it...

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See detailA Text Mining-based Recommendation System for Customer Decision Making in Online Product Customization
Ittoo, Ashwin; Zhang, Yi Yang; Jiao, Roger

in IEEE Proceedigns of International Conference on Management of Innovation and Technology (2006)

See detailSupply chain coordination through contract negotiation
Arda, Yasemin; Hennet, Jean-Claude

in DC-ECC 06, 44th IEEE Conference on Decision and Control and the European Control Conference, Seville, Spain, 12-15 December 2005 (2005, December 12)

The purpose of the paper is to evaluate the efficiency of different types of contracts between the industrial partners of a supply chain. Such an evaluation is made on the basis of the relationship be...

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See detailDiscrete optimization
Louveaux, Quentin

Poster (2005, September)

Have you ever wondered what is the shortest route to join the office? What is the best way to plan a trip through several cities? You have maybe already played with magical squares? Then you have met ...

See detailImpact des délais d'approvisionnement sur les performances de chaînes logistiques
Arda, Yasemin

Conference (2005, May 19)

Les chaînes logistiques sont souvent constituées de différentes entreprises qui interviennent dans le processus de fabrication d’une famille de produits. Pour chaque entreprise particulière, il ...

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See detailOptimization of Surface Allocation using Heuristic Approaches
Langer, Yves; Bay, Maud; Crama, Yves; Bair, Frédéric; Caprace, Jean-David; Rigo, Philippe

in COMPIT 2005 , Hambourg, Germany (2005, May)

In this paper, we present a scheduling problem that arises in factories producing large building blocks (in our case, a shipyard workshop producing prefabricated keel elements). The factory is divided...

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See detailValid inequalities for the intersection of two knapsacks
Louveaux, Quentin

Conference (2005, March)

We address the question to what extent polyhedral knowledge about individual knapsack constraints suffices or lacks to describe the convex hull of the binary solutions to their intersection. It turns ...

See detailInter-modal freight terminals location: Discover the best potential locations on large networks
Limbourg, Sabine; Jourquin, Bart

Conference (2005)

The optimal location of a facility is a rather complex task that was already studied many times. Several optimal location problems and solution exists, but only a few can be applied to the location of...

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See detailOptimal location of inter-modal terminals
Jourquin, Bart; Limbourg, Sabine

Conference (2005)

The optimal location of a facility is a rather complex task that was already studied many times. Several optimal location problems and solution exists, but only a few can be applied to the location of...

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See detailInter-Modal Terminals for Freight
Limbourg, Sabine; Jourquin, Bart

Conference (2005)

The optimal location of terminals and logistic centres is an up-to-date research topic. The first goal of this paper is to outline a method that helps to isolate the best potential locations. The basi...

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See detailSolving the m-TSP Problem with Stochastic or Time Dependent Demands
Louveaux, François; Schyns, Michael

in Opasanon, S.; Miller-Hooks, E. (Eds.) Proceedings of TRISTAN V (Triennial Symposium on Transportation Analysis) (2004, June)

There are many examples of problems in transportation where some elements are uncertain. In the distribution of goods as well as systems responding to calls for emergency, demands typically occur in a...

See detailOptimizing the ordering policy in a supply chain
Arda, Yasemin; Hennet, Jean-Claude

in INCOM 04, 11th IFAC Symposium on Information Control Problems in Manufacturing, Salvador, Brazil, 5-7 April 2004 (2004, May 05)

This study analyzes an inventory management problem within a supply chain. An enterprise whose stock is replenished by outside suppliers faces random demands for one of its products. The objective is ...

See detailInventory control in a multi-supplier system
Arda, Yasemin; Hennet, Jean-Claude

in IGLS 04, 13th International Working Seminar on Production Economics, Igls/Innsbruck, Austria, 16-20 February 2004 (2004, February 16)

An enterprise network is analyzed from the viewpoint of an end-product manufacturer who receives customer orders and organises his production and supply policy so as to minimize the sum of his average...

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See detailFour extended formulations of the corner polyhedron
Louveaux, Quentin

Conference (2004, January)

See detailNonparametric censored regression using preliminary kernel smoothing
Heuchenne, Cédric; Van Keilegom, Ingrid

in Proceedings of the 6th World Congress of the Bernoulli Society for Mathematical Statistics and Probability and the 67th Annual Meeting of the IMS (2004)

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See detailOptimal location of inter-modal terminals
Jourquin, Bart; Limbourg, Sabine

Conference (2004)

The known methods to solve the problem of the optimal location of inter-modal terminals are “node” based, in the sense that they use the locations of the demands and the supplies as main input. Th...

See detailThe case sensitivity function approach to diagnostic and robust computation: a relaxation strategy
Critchley, Frank; Schyns, Michael; Haesbroeck, Gentiane; Kinns, D.; Atkinson, R. A.; Lu, G.

in Antoch, Jaromir (Ed.) COMPSTAT 2004: Proceedings in Computational Statistics (2004)

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See detailLifting of valid inequalities revisited
Louveaux, Quentin

Conference (2003, August)

See detailEstimation in censored linear regression via preliminary smoothing
Heuchenne, Cédric; Van Keilegom, Ingrid

in Bulletin of the International Statistical Institute, 54th Session (2003)

See detailA two-stage stochastic programming framework for transportation planning in disaster response
Barbarosoglu, Gulay; Arda, Yasemin

Conference (2002, July 08)

This study proposes a two-stage stochastic programming model to plan the transportation of vital first-aid commodities to disaster-affected areas during emergency response. A multi-commodity multi-mod...

See detailIntegration of fuzzy linear optimization and scenario analysis in network flow problems: disaster response perspective
Barbarosoglu, Gulay; Arda, Yasemin

in IEPM 01, International Conference in Industrial Engineering and Production Management, Québec, Canada, 20-23 August 2001 (2001, August 20)

In this paper, we address the problem of transporting vital commodities and emergency personnel during the response stage of a disaster relief operation by integrating fuzzy linear optimization and th...



 
 
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