| Name | Co-authors | Talk | Session |
Guillaume Amand
Université de Liège | | Stackleberg game in transportation | Friday 09:25:00 | |
Francis Bach
INRIA - Ecole Normale Superieure
France | | Discriminative Clustering for Image Co-segmentation | Thursday 14:00:00 | |
Justyna Bakowska
Hasselt University
| An Caris, Katrien Ramaekers,Gerrit Janssens, Tom Bellemans | Developments in Freight Modeling | Thursday 16:10:00 | |
Jeroen Beliën
hogeschool universiteit brussel | Dries Goossens, Daam Van Reeth, Liesje De Boeck | Using mixed integer programming to win a cycling game | Thursday 14:00:00 | |
Lotte Berghman
Katholieke Universiteit Leuven | Roel Leus | Using Lagrangian relaxation to solve a dock assignment problem | Thursday 16:10:00 | |
Burak Bilgin
Kaho Sint-Lieven | Patrick De Causmaecker, Greet Vanden Berghe | Modelling questions in nurse rostering | Friday 11:00:00 | |
Raymond Bisdorff
University of Luxembourg
Luxembourg | | On detecting and enumerating chordless circuits in a digraph | Friday 15:10:00 | |
Pierre Borckmans
UCL (INMA) | Pierre-Antoine Absil | Fast Oriented Bounding Box Computation Using Particle Swarm Optimization | Thursday 14:00:00 | |
Kris Braekers
Universiteit Hasselt | Gerrit K. Janssens and An Caris | Integrating empty container allocation with vehicle routing decisions | Thursday 14:00:00 | |
Willem K. Brauers
University of Antwerp | R. Ginevicius, R. Bisdorff | Regional Development in a Well-Being Economy: The Case of Lithuania | Friday 09:00:00 | |
Jasmine Buré
KULeuven | Pieter Vansteenwegen, Dirk Cattrysse | The mobile repairman problem: classification of existing models | Friday 15:10:00 | |
Sylvie Busschaert
University of Antwerp | | Evaluation of multi-criteria techniques for project portfolio management | Friday 09:00:00 | |
Dario Campagna
University of Perugia
Italy | | A CLP engine for product configuration | Friday 11:00:00 | |
Wouter Charle
K.U.Leuven
| Francesco Viti, Chris M.J. Tampère | A clustering approach to estimate route travel time distributions | Friday 09:25:00 | |
Herman Crauwels
campus De Nayer, Hogeschool voor Wetenschap & Kunst | | Educational course timetabling: a case study | Thursday 11:00:00 | |
Stefan Creemers
K.U.Leuven
| Roel Leus | R&D project planning with multiple trials in uncertain environments | Thursday 16:10:00 | |
Frans De Rooij
AIMMS
The Netherlands | | Fast optimization modeling with AIMMS | Friday 15:10:00 | |
Stijn De Vuyst
Ghent University | Dieter Fiems (first author), Stijn De Vuyst, Herwig Bruneel. | Queueing analysis of outpatient scheduling in health care | Friday 11:00:00 | |
Boris Defourny
University of Liege | Damien Ernst and Louis Wehenkel | Extra-Small Scenario Trees for Multistage Stochastic Programming | Friday 09:25:00 | |
Peter Demeester
KaHo Sint-Lieven | | A hyper-heuristics approach to solve a real-world and a benchmark examination timetabling problem | Thursday 11:00:00 | |
Peter Demeester
KaHo Sint-Lieven | G. Vanden Berghe, P. De Causmaecker | Educational timetabling, an overview of a mature research domain | Thursday 11:00:00 | |
Thomas Demoor
Ghent University | Dieter Fiems and Herwig Bruneel | Simulation study of outpatient scheduling with unpunctual patients | Friday 11:00:00 | |
Reginald Dewil
Katholieke Universiteit Leuven | Pieter Vansteenwegen, Dirk Cattrysse | The generalized sequential ordering problem for laser cutting toolpath generation | Thursday 14:00:00 | |
Jérémie Dubois-lacoste
IRIDIA, CoDE, Université Libre de Bruxelles | Manuel López-Ibáñez and Thomas Stützle | A Hybrid Algorithm for Bi-objective Flowshop Scheduling | Thursday 16:10:00 | |
Wout Dullaert
University of Antwerp | B. Raa | Aggregate production-distribution planning with shared production resources | Friday 09:25:00 | |
Julien Dupuis
UCLouvain | Pierre Schaus, Yves Deville | Failure Detection for the Bin-Packing Constraint | Thursday 16:10:00 | |
Céline Engelbeen
Université Libre de Bruxelles | Antje Kiesel | Binary matrix decompositions without tongue-and-groove underdosage for radiation therapy planning | Friday 11:00:00 | |
Mahsa Faizrahnemoon
Islamic Azad University, Tehran Science and Research Branch
| A. Davoodi | Sensitivity analysis of the additive model in data envelopment analysis while inputs and outputs are fuzzy data | Friday 09:00:00 | |
Bart Feyaerts
Ghent University
| Stijn De Vuyst, Sabine Wittevrongel, Herwig Bruneel | Modelling data traffic performance in file servers: session-based arrivals | Friday 11:00:00 | |
Kevin Ghislain
ULB
Limal | B. Fortz, S. Zampelli, P. Schaus, A. Zanarini | DynaUniversity2009 | Thursday 14:00:00 | |
Dries Goossens
Katholieke Universiteit Leuven | F.C.R. Spieksma | The carry-over effect does not exist in football | Thursday 11:00:00 | |
Maria Govorun
ULB, Belgium | | Financial flow modeling for non-state pension funds | Thursday 16:10:00 | |
Marie-anne Guerry
Vrije Universiteit Brussel
Brussel | | Multicriteria decision making in a multi-level manpower system | Friday 09:00:00 | |
Sophie Hautphenne
Université Libre de Bruxelles | Guy Latouche | Extinction Probability of a Branching Process in a Markovian Random Environment | Friday 09:25:00 | |
Trong Viet Ho
UCL, Belgium | Yves Deville, Olivier Bonaventure | Implementation in COMET of a Traffic Engineering technique that Preserves IP Fast Reroute | Thursday 14:00:00 | |
Olivier Hudry
Ecole nationale supérieure des télécommunications
France | Lucile Belgacem, Irène Charon | Independent sets and the routing and wavelength assignment problem | Thursday 11:00:00 | |
Mariya Ishteva
Université catholique de Louvain, Department of Mathematical Engineering | PA. Absil, S. Van Huffel, L. De Lathauwer | On the best low multilinear rank approximation of higher-order tensors | Thursday 11:00:00 | |
Imed Kacem
UNIVERSITY PAUL VERLAINE METZ
France | Hans Kellerer | No-Wait Scheduling of a Single-Machine to Minimize the Maximum Lateness | Friday 09:00:00 | |
Sandeep Karmarkar
India Institute of Management, Ahmedabad
India | G. Dutta, T. Bandyopadhyay | Impact of Demand Unconstraining and Dependency on Airlines Revenue Performance | Thursday 16:10:00 | |
Ben Lauwens
Royal Military Academy
| | Stochastic Hybrid Simulation | Friday 11:00:00 | |
Vianney Le Clément
UCLouvain | Yves Deville, Christine Solnon | Constraint-Based Graph Matching | Thursday 14:00:00 | |
Sabine Limbourg
HEC-ULg
Liège | B. Jourquin | Location and market area of rail-road terminals | Thursday 11:00:00 | |
Thibaut Lust
Faculté Polytechnique de Mons | Jacques Teghem | Combining metaheuristics and exact methods to solve the multiobjective multidimensional knapsack problem | Friday 09:00:00 | |
Guoxuan Ma
K.U. Leuven | Erik Demeulemeester | Evaluating the impact of case mix decisions on capacity utilizations through discrete-event simulation | Friday 11:00:00 | |
Tabitha Maes
Hasselt University
Beligië | Katrien Ramaekers, An Caris, Tom Bellemans, Gerrit Janssens | Incorporating logistics decisions in activity-based freight modeling | Thursday 11:00:00 | |
Thierry Marchant
Ghent University | | Score-based bibliometric rankings of authors | Friday 11:00:00 | |
Jean-luc Marichal
University of Luxembourg
Luxembourg | P. Mathonet | Measuring the interactions among variables of functions over the unit hypercube | Friday 11:00:00 | |
Pierre Mathonet
University of Luxemboug,
Luxembourg | JL. Marichal | Weighted Banzhaf interaction indexes and weighted least squares | Friday 11:00:00 | |
Pablo Andres Maya Duque
University of Antwerp | K. Sorensen, P. Goos | A GRASP metaheuristic for allocating resources to improve the accessibility in a road network after a natural disaster | Thursday 11:00:00 | |
Tommy Messelis
KULeuven Campus Kortrijk | Stefaan Haspeslagh, Patrick De Causmaecker | On expressing nurse rostering constraints as propositional satisfiability problems | Thursday 16:10:00 | |
Stephane Aimé Metchebon Takougang
UMONS, Faculté Polytechnique de Mons | M. Pirlot | Assessing the evolution of a situation based on GIS | Friday 11:00:00 | |
Gilles Meyer
University of Liège | Gilles Meyer, Silvère Bonnabel and Rodolphe Sepulchre | Regression on fixed-rank positive semidefinite matrices: a geometric approach | Thursday 11:00:00 | |
Mustafa Misir
KaHo Sint-Lieven - Katholieke Universiteit Leuven | Katja Verbeeck, Greet Vanden Berghe, Patrick De Causmaecker | Hyper-heuristics learning a varying set of low-level heuristics | Friday 09:00:00 | |
Jean-noël Monette
Université catholique de Louvain | Yves Deville, Pascal Van Hentenryck | Just-In-Time Scheduling with Constraint Programming | Friday 11:00:00 | |
Sébastien Mouthuy
Université Catholique de Louvain | Y.Deville and P.Van Hentenryck | Constraint-based Very Large-Scale Neighborhoods | Thursday 14:00:00 | |
Giang Nguyen
Universite Libre de Bruxelles
| | Markov Chains to solve the Hamiltonian Cycle Problem | Thursday 11:00:00 | |
Sergio Perelman
Université de Liège | Tomas Serebrisky | Measuring the Technical Efficiency of Airports in Latin America and the Caribbean | Thursday 16:10:00 | |
Quang Dung Pham
UCLouvain | Yves DEVILLE, Pascal van HENTENRYCK | Constrained Optimum Paths Problems with LS(Graph) | Thursday 16:10:00 | |
Thierry Pironet
Université de Liège | Amand, Arda, Crama, Kronus, Pironet | Vehicle loading optimization with stochastic supply | Thursday 11:00:00 | |
Michael Poss
Université Libre de Bruxelles | L.S. Moulin, C. Sagastizabal | Transmission Expansion Planning with Re-design | Thursday 11:00:00 | |
Birger Raa
Ghent University | W. Dullaert | An integrated solution method for order batching and picking | Friday 15:10:00 | |
Patrick Schittekat
University of Antwerp
| Frederik Michieks | Searching for reliable routes in case of customer demand dependence | Thursday 14:00:00 | |
Frederic Semet
Ecole Centrale de Lille
France | B. Gendron, P.-V. Khuong | Variable Neighborhood Approaches For a Multi-Echelon Capacitated Location-Distribution Problem | Friday 09:25:00 | |
Rodolphe Sepulchre
Université de Liège
| Michel Journée, Peter Richtarik, Yurii Nesterov | Generalized Power Method for Sparse Principal Component Analysis | Thursday 11:00:00 | |
Megha Sharma
Indian Institute of Management Ahmedabad
India | D. Gosh | Design of Reliable Networks | Thursday 11:00:00 | |
Thomas Stützle
Université Libre de Bruxelles (ULB)
Brussels | Prasanna Balaprakash, Mauro Birattari, Marco Dorigo | Effective Estimation-based Stochastic Local Search Algorithms for Stochastic Routing Problems | Friday 11:00:00 | |
Kenneth SÖrensen
Universiteit Antwerpen | Dirk Cattrysse | A Variable Neighbourhood Search metaheuristic for scheduling the hot rolling operations at a steel mill | Thursday 16:10:00 | |
Fabrice Talla Nobibon
Katholieke Universiteit Leuven | C. Hurkens, R. Leus, FCR. Spieksma | Coloring Graphs to Avoid Monochromatic Cycles | Friday 15:10:00 | |
Philippe Toint
Fac. Universitaires Notre-Dame de la Paix | | BFO: a simple "brute-force" optimizer | Thursday 14:00:00 | |
Konstantinos Triantis
Virginia Tech/Northern Virginia Center
Usa | Warren Vaneman, Kalyan Pasupathy | Dynamic Performance Measurement and Evaluation: Will Bridging Paradigms Lead to Improved System Design? | Thursday 16:10:00 | |
Natalya Usotskaya
Maastricht University
Netherlands | A.Berger, A.Grigoriev | The time-optimal helicopter trajectory is a circle segment | Thursday 14:00:00 | |
Joos Van Den Bergh
University of Antwerp | Kenneth Sorensen | Effective routing for couriers: a divide and conquer strategy | Thursday 14:00:00 | |
Rowan Van Schaeren
Antwerp Maritime Academy | | Tank allocation for liquid bulk vessels using a hybrid constraint programming approach | Friday 11:00:00 | |
| | Abstract:
The chemical industry is characterized by a very strong competitive environment. This leads to an increased pressure on providing consistent quality, fast delivery and cost-cuttings. Chemicals are transported all over the world in special, dedicated vessels. These chemical tankers form an important aspect of this liquid bulk chemicals trade and the number of chemical tankers available on the market increases steadily. Chemical tankers distinguish themselves from other tankers in the large number of separate cargo tanks available to load cargo. Some chemical tankers have over 30 individual tanks. This allows for many different cargoes to be transported simultaneously, but requires that each cargo tank has its own pump and piping system to connect with the shore in order to prevent mixing or contaminating individual cargoes. This also has an important impact on the planning of cargoes on board of these chemical tankers as cargo interactions can result in dangerous situations. Almost all chemical products can be considered dangerous one way or the other (being labeled as e.g. corrosive, marine pollutant, toxic ...). These products must therefore be stored in accordance with stringent regulations.
Concerning stowage the most important criterion is segregation. Segregation is not only important between the different products themselves (certain products like e.g. caustic soda and sulfuric acid cannot be stowed in adjacent tanks) but also with respect to the tank coatings that protect the tanks from products stored in them. In addition to this, the vessel's stability constraints complicate the capacity planning even further. Because of the computational complexity of mathematically optimizing the problem, loading plans are generally generated manually by the vessel planners and checked by a stability program afterward. Because of the multitude of constraints, regulations and ``good practices'', it is very difficult to generate high quality loading plans manually. Optimization methods capable of handling these side constraints and generating high quality solutions can therefore greatly support vessel planners and free up time for handling non-standard scheduling issues.
Academic literature on the tank allocation problem (TAP) or operational planning is limited. Most of the conducted research considers both the load planning and vessel routing of chemical tankers. However, only a few deal with segregation and stability constraints simultaneously in their load planning, which are essential in real-life applications. The literature review illustrates the difficulties of simultaneously addressing both planning and routing aspects for loading chemical vessels even if no or only simplified ship stability constraints are taken into account. As this research aims at modeling the stability of chemical tankers in full detail, we start by focusing on the load planning part of the problem. Although the loading aspect of chemical vessels can be addressed successfully by mixed integer programming, constraint programming (CP) looks more promising for developing an integrated model in the future, in which both the scheduling of several ports aspect and the load planning of cargo aspect are combined.
In the proposed model, CP is used for making the allocations of cargo to the tanks and LP is dynamically used as a final constraint checker for the ship stability at the potential solution nodes of the search tree. More precisely, at a potential solution node of the CP search tree, every tank is empty or is allocated to a cargo ensuring that there is enough volume for each cargo while satisfying segregation constraints. The LP is then called as a subroutine to check and optimize the stability constraints deciding how many tons of the cargo will be allocated to each tank by considering the cargo allocation as given. If the stability requirements cannot be satisfied by the LP the node is simply discarded. This simple hybridization between CP (Master) and LP (slave) is used in a Branch and Bound scheme to maximize the unused free space of the tanks.
Computational results with Comet show that this hybrid CP-LP approach is an interesting path for solving the operational planning problem of chemical tankers (load planning and scheduling). Computational times prove to be operationally acceptable with the proposed model.
Our current research focuses on finding a good CP search algorithm, as this is critical concerning computation times. Integrating the ship routing and scheduling into the operational planning will be the topic of future research.
|
Sofie Van Volsem
Ghent University
Zwijnaarde | S. Neirynck | Using the PlayStation3 for speeding up metaheuristic optimization | Friday 09:00:00 | |
Wim Vancroonenburg
KaHo Sint-Lieven | T. Wauters, G. Vanden Berghe | A real world 1D stock cutting problem: exact and heuristic algorithms | Thursday 14:00:00 | |
Pablo Vanegas
Katholieke Universiteit Leuven | Dirk Cattrysse, Jos Van Orshoven | Budget Constraint in Reforestation for Sediment Flow Minimization | Thursday 14:00:00 | |
Jannes Verstichel
KaHo Sint-Lieven | G. Vanden Berghe, H. Callens | A pooling approach for the feed mixing problem | Thursday 11:00:00 | |
Joris Walraevens
Ghent University - UGent
| Tom Maertens. Herwig Bruneel | Generalization of preemptive and non-preemptive priority queues | Friday 11:00:00 | |
Tony Wauters
KaHo Sint-Lieven | Jannes Verstichel, Katja Verbeeck, Greet Vanden Berghe | A hybrid learning and combinatorial optimization approach for automotive maintenance scheduling | Thursday 16:10:00 | |
Pieter Wuille
KULeuven | Tom Schrijvers | Finite Domain Modeling and Solving in the Monadic Constraint Programming Framework | Thursday 16:10:00 | |
80 talks
