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   Detailed program
Conference dinner



Thursday, 30 January
09:10-09:30Opening sessionAmphi Cuccaroni
09:30-10:30Plenary session - Adam Letchford (Chair: Martine Labbé)Amphi Cuccaroni
10:30-11:20Coffee breakB14-B15-B16
11:20-12:40Parallel sessions
  Multi-objective Optimization
Chair: Sara Tari
Room: E501
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
12:40-14:10Lunch/ORBEL Board meetingB14-B15-B16/E501
14:10-15:10Parallel sessions
  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
15:10-15:50Coffee breakB14-B15-B16
15:50-16:40Parallel sessions
  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
Chair: Yuan Yuan
Room: E601
Analytics 3
Chair: Jari Peeperkorn
Room: E602
16:50-17:30ORBEL general assemblyAmphi Cuccaroni
19:00-20:00CocktailBar Zango
20:30-23:00DinnerLa Terrasse des Ramparts

Friday, 31 January
09:30-10:30Plenary session - Miguel F. Anjos (Chair: Luce Brotcorne)Amphi Cuccaroni
10:30-11:20Coffee breakB14-B15-B16
11:20-12:40Parallel sessions
  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
14:10-15:10Parallel sessions
  Orbel Award
Chair: Jeroen Belien
Room: E501
Chair: Julien Dewez
Room: E502
Trucking Optimization
Chair: Hatice Çalik
Room: E601
Analytics 5
Chair: Diego Olaya
Room: E602
15:10-15:50Coffee breakB14-B15-B16
15:50-16:50Parallel sessions
  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
17:00-17:15ORBEL award and closing sessionAmphi Cuccaroni
17:15-18:30Closing cocktailB14-B15-B16

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
  • An Exact Model for the order picking problem
    Farzaneh Rajabighamchi (Maastricht)
    Co-authors: Christof Defryn, Stan Van Hoesel
    order picking activity has become increasingly significant to manage due to the introduction of operating programs such as Just-In-Time (JIT) principle, cycle time reduction and quick response to orders and new marketing strategies such as micro marketing. With so many new technological advancements, the world of e-Commerce is transforming rapidly. This significant growth in digital marketing and daily increase in the number of customers who do online shopping, impose challenges and pressure for warehouses to operate more efficient and fast to satisfy customer demands. Any under-performance in order picking can result in high operational cost and unsatisfactory service for the warehouse and the whole supply chain. As a consequence, to increase the operate efficiency, the order-picking process needs to be optimally controlled. The order picking process, defined as the retrieval of products from their storage locations based on customer orders, is the most time-consuming warehouse process, especially in the case of manual order picking. Therefore, it contributes largely to the operational cost of the warehouse (Tompkins et al. 1996). By reducing the picking time which consists of travel time and time for picking the products, order picking productivity can be improved. one of the best ways of reducing travel times is by finding a sequence in which items have to be picked from storage such that travel distances are as short as possible. This paper is dealing with the sequencing and routing of order pickers within a multi-block warehouse layout with parallel aisles. In the literature, exact algorithms only exist for small warehouses with few number of cross aisles, while for other larger warehouse types some heuristics methods are provided. Most of the existing models rely on the definition of a (Steiner) Travelling Salesman problem over the set of product locations. This paper will focus on presenting an exact routing method for warehouses with parallel aisles, a depot, and possibilities for changing aisles by using cross aisles. These cross aisles are usually located at the front and back of the warehouse, but there can also be one or more cross aisles between them. to the best of our knowledge, this problem can not be solved in a polynomial-time except when there are a bounded number of cross-aisles. we propose an exact algorithm for any number of cross-aisles to use it for problem implementation. We show in this paper that the problem can be efficiently solved optimally with integer programming using an exact formulation as well as adequate pre-processing. We present a new efficient exact mixed integer linear programming formulation that considers the picker routing based on the active aisle corner nodes. in order to increase the calculation speed and reduce the running time, first we propose some pre-processig algorithms which are based on network(graph) reduction methods. then, an exact mixed integer model is implemented and evaluated experimentally. the presented method allows solving bigger (more realistic) instances in a minimum amount of time. Moreover, some problem instances from the literature are implemented and detailed numerical experiments are carried out to evaluate the performances of the proposed model and compare the results with the existing methods in literature. In conclusion, for the majority of the instances, a newly developed model appears to perform better than the existing models and it comes out to be an efficient methods in terms of solution quality and computational efficiency. The results illustrate that the proposed model outperforms existing formulations in simillar articles in terms of simplicity, size and calculation time.
  • Integrating Classification, Labelling and Packaging Regulations in Manual Order Picking
    Sarah Vanheusden (Hasselt University, research group logistics)
    Co-authors: Teun van Gils, Katrien Ramaekers and An Caris
  • Integration of multiple order picking planning problems and vehicle routing: state of the art
    Ruben D'haen (UHasselt)
    Co-authors: Kris Braekers, Katrien Ramaekers
  • The Scattered Storage Assignment Problem
    Harol Mauricio Gamez Alban (University of Antwerpen)
    Co-authors: Trijntje Cornelissens and Kenneth Sörensen

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

    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

      ORBEL - Conference chairs: Diego Cattaruzza and Maxime Ogier