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Schedule
Thursday, 30 January |
08:30-09:10 | Welcome-registration-coffee | B14-B15-B16 |
09:10-09:30 | Opening session | Amphi Cuccaroni |
09:30-10:30 | Plenary session - Adam Letchford (Chair: Martine Labbé) | Amphi Cuccaroni |
10:30-11:20 | Coffee break | B14-B15-B16 |
11:20-12:40 | Parallel sessions |
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Multi-objective Optimization Chair: Sara Tari Room: E501 |
Health-care Chair: Véronique François Room: E502 |
Public Transportation Chair: Javier Duran Micco Room: E503 |
Global Optimization Chair: Olivier Rigal Room: E601 |
Analytics 1 Chair: Rafael Van Belle Room: E602 |
12:40-14:10 | Lunch/ORBEL Board meeting | B14-B15-B16/E501 |
14:10-15:10 | Parallel sessions |
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Air, Rail and Multimodal Transportation Chair: Paola Paregrini Room: E501 |
Game Theory Chair: Lotte Verdnock Room: E502 |
Transportation of People Chair: Yves Molenbruch Room: E503 |
Multi-level Optimization Chair: Concepcion Dominguez Room: E601 |
Analytics 2 Chair: Vedavyas Etikala Room: E602 |
15:10-15:50 | Coffee break | B14-B15-B16 |
15:50-16:40 | Parallel sessions |
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Sport Timetabling Chair: Dries Goossens Room: E501 |
Project Management and Scheduling Chair: Fan Yang Room: E502 |
Rich Routing and Graphs Chair: Alexandre Bontems Room: E503 |
Logistics Chair: Yuan Yuan Room: E601 |
Analytics 3 Chair: Jari Peeperkorn Room: E602 |
16:50-17:30 | ORBEL general assembly | Amphi Cuccaroni |
19:00-20:00 | Cocktail | Bar Zango |
20:30-23:00 | Dinner | La Terrasse des Ramparts |
Friday, 31 January |
09:30-10:30 | Plenary session - Miguel F. Anjos (Chair: Luce Brotcorne) | Amphi Cuccaroni |
10:30-11:20 | Coffee break | B14-B15-B16 |
11:20-12:40 | Parallel sessions |
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Automatic Configuration and Metaheuristics Analysis Chair: Kenneth Sorensen Room: E501 |
Real Life and Integrated Problems Chair: Jeroen Belien Room: E502 |
Warehouse Management Chair: Harol Mauricio Gamez Room: E601 |
Analytics 4 Chair: Noureddine Kouaissah Room: E602 |
12:40-14:10 | Lunch | B14-B15-B16 |
14:10-15:10 | Parallel sessions |
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Orbel Award Chair: Jeroen Belien Room: E501 |
Optimization Chair: Julien Dewez Room: E502 |
Trucking Optimization Chair: Hatice Çalik Room: E601 |
Analytics 5 Chair: Diego Olaya Room: E602 |
15:10-15:50 | Coffee break | B14-B15-B16 |
15:50-16:50 | Parallel sessions |
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Learning and Optimization Chair: Johan Van Kerckhoven Room: E501 |
Lot-sizing and Inventory Chair: Philippe Chevalier Room: E502 |
Rich Routing Chair: Cristian Aguayo Room: E601 |
17:00-17:15 | ORBEL award and closing session | Amphi Cuccaroni |
17:15-18:30 | Closing cocktail | B14-B15-B16 |
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Thursday 11:20 - 12:40 Multi-objective Optimization Room E501 - Chair: Sara Tari
Thursday 11:20 - 12:40 Health-care Room E502 - Chair: Véronique François
Thursday 11:20 - 12:40 Public Transportation Room E503 - Chair: Javier Duran Micco
Thursday 11:20 - 12:40 Global Optimization Room E601 - Chair: Olivier Rigal
Thursday 11:20 - 12:40 Analytics 1 Room E602 - Chair: Rafael Van Belle
Thursday 14:10 - 15:10 Air, Rail and Multimodal Transportation Room E501 - Chair: Paola Pellegrini
Thursday 14:10 - 15:10 Game Theory Room E502 - Chair: Lotte Verdnock
Thursday 14:10 - 15:10 Transportation of People Room E503 - Chair: Yves Molenbruch
Thursday 14:10 - 15:10 Multi-level Optimization Room E601 - Chair: Concepcion Dominguez
Thursday 14:10 - 15:10 Analytics 2 Room E602 - Chair: Vedavyas Etikala
Thursday 15:50 - 16:50 Sport Timetabling Room E501 - Chair: Dries Goossens
Thursday 15:50 - 16:50 Project Management and Scheduling Room E502 - Chair: Fan Yang
Thursday 15:50 - 16:50 Rich Routing and Graphs Room E503 - Chair: Alexandre Bontems
Thursday 15:50 - 16:50 Logistics Room E601 - Chair: Silia Mertens
Thursday 15:50 - 16:50 Analytics 3 Room E602 - Chair: Jari Peeperkorn
Friday 11:20 - 12:40 Automatic Configuration and Metaheuristics Analysis Room E501 - Chair: Kenneth Sorensen
Friday 11:20 - 12:40 Real Life and Integrated Problems Room E502 - Chair: Jeroen Belien
Friday 11:20 - 12:40 Warehouse Management Room E601 - Chair: Harol Mauricio Gamez
Friday 11:20 - 12:40 Analytics 4 Room E602 - Chair: Noureddine Kouaissah
Friday 14:10 - 15:10 Orbel Award Room E501 - Chair: Jeroen Belien
Friday 14:10 - 15:10 Optimization Room E502 - Chair: Julien Dewez
- New Multi-Step Conjugate Gradient Method for Optimization
Issam Moghrabi (Gulf University for Science and Technology) Co-authors: Issam A.R. Moghrabi Abstract: Conjugate Gradient methods (CG) are a class of methods for solving large unconstrained optimization problems. Their storage requirements are rather minimal compared to other methods as they do not store any matrices. Such methods have been used in a variety of domains to solve nonlinear optimization problems as well as systems nonlinear equations. The methods have proven their effectiveness in applications such as Image restoration using a conjugate gradient-based adaptive filtering and Brain Magnetic Resonance Images Segmentation. While such methods converge in at most n iterations on quadratic functions for exact line searches, they are also used to minimize non-quadratic functions and inexact line searches. In the context of minimizing non-quadratic functions, the methods need to be restarted when certain criteria is met On the other hand, multi-step methods are secant-like techniques of the quasi-Newton type that, unlike the classical methods, construct nonlinear alternatives to the quantities in the so-called Secant equation. Multi-step methods instead utilize data available from the m most recent iterations and thus create an alternative to the Secant equation with the intention of creating better Hessian approximation that induce faster convergence to the minimizer of the objective function f. The methods, based on reported numerical results published in several research papers related to the subject, have introduced substantial savings in both iteration and function evaluation counts. Encouraged by the successful performance of the methods, we explore in this paper using them in developing a new Conjugate Gradient (CG) algorithm. CG methods gain popularity on big problems and in situations when memory resources are scarce. The numerical experimentations on the new method are encouraging and open venue for further investigation of such techniques to explore their merits in a multitude of applications. The method requires less storage to implement than other known methods. This saving in resources is especially appreciated on large problems. Other choices for the parameters used in the construction of the search directions are under consideration to determine whether the numerical performance of the method can be improved further. There also remains the issue of developing automatic restart criteria that provides appropriate switching among several options. The global convergence properties of such methods are also under study.
- Constrained Binary Quadratic PRoblems? No.... There is EXPEDIS
Nicolo Gusmeroli (TU Dortmund) Co-authors: Angelika Wiegele
- Computing lower bounds on the nonngative rank using a nested polytopes formulation
Julien Dewez (Université catholique de Louvain) Co-authors: François Glineur
Friday 14:10 - 15:10 Trucking Optimization Room E601 - Chair: Hatiz Çalik
Friday 14:10 - 15:10 Analytics 5 Room E602 - Chair: Diego Olaya
Friday 15:50 - 16:50 Learning and Optimization Room E501 - Chair: Jorik Jooken
Friday 15:50 - 16:50 Lot-sizing and Inventory Room E502 - Chair: Philippe Chevalier
Friday 15:50 - 16:50 Rich Routing Room E601 - Chair: Cristian Aguayo
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ORBEL - Conference chairs: Diego Cattaruzza and Maxime Ogier
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