Séance TB3 - Transport multi-modes et chemins de fer / Intermodal and rail transportation
Jour mardi, le 8 mai 2007 Salle Gérard Parizeau Président Teodor Gabriel Crainic
Présentations
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13h30- 13h55 |
Improving Performance of Rail Yards Through Dynamic Reassignments of Empty Cars |
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Tolga Bektas, Université de Montréal, CRT, C.P. 6128, Succ. Centre-ville, Montréal, Québec, Canada, H3C 3J7 Teodor Gabriel Crainic, Université du Québec à Montréal et CRT, C.P. 6128, Succ. Centre-ville, Montréal, Québec, Canada, H3C 3J7 Vincent Morency, CN This talk will describe a dynamic reassignment procedure to reduce the time that empty cars spend in rail yards. Computational results based on real-life data gathered from one of the major railroad companies in North America will be presented. |
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13h55- 14h20 |
An Optimization Model for the Inland Allocation of Empty Containers |
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Massimo Di Francesco, University of Cagliari, Land Engineering, Piazza d’Armi 16, Cagliari, Sardegna, Italy, 09123 Alessandro Olivo, University of Cagliari, Land Engineering, Piazza d’Armi 16, Cagliari, Sardegna, Italy, 09123 Paola Zuddas, University of Cagliari, Land Engineering, Piazza d’Armi 16, Cagliari, Sardegna, Italy, 09123 Shipping companies must maintain a sufficient number of empty containers in inland depots in anticipation of future loaded movements. They can dispatch empty containers among depots, build stocks, perform substitutions among container types and rent containers, according to rental contracts clauses. We formulate an optimization model to solve this issue. |
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14h20- 14h45 |
Time-Dependent Service Network Design in Freight Rail Transportation |
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Endong Zhu, Université de Montréal, CIRRELT, C.P. 6128, Succ. Centre-ville, Montréal, Québec, Canada, H3C 3J7 Teodor Gabriel Crainic, Université du Québec à Montréal et CRT, C.P. 6128, Succ. Centre-ville, Montréal, Québec, Canada, H3C 3J7 Michel Gendreau, Université de Montréal, Centre de recherche sur les transports, C.P. 6128, Succ. Centre-ville, Montréal, Québec, Canada, H3C 3J7 We are addressing the service network design problem in freight rail transportation. The problem simultaneously considers the service selection (with scheduling), traffic distribution, blocking policy, and train make-up policy. To explicitly describe the flows of services, blocks, and cars/commodities, a cyclic time-space network structure with three layers is constructed. Based on the network structure, we present a linear mixed-integer formulation. Solution method ideas are also discussed. |
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14h45- 15h10 |
An Optimization Model for the Maritime Reposition of Empty Containers under Data Shortage |
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Massimo Di Francesco, University of Cagliari, Land Engineering, Piazza d’Armi 16, Cagliari, Sardegna, Italy, 09123 Teodor Gabriel Crainic, Université du Québec à Montréal et CRT, C.P. 6128, Succ. Centre-ville, Montréal, Québec, Canada, H3C 3J7 Paola Zuddas, University of Cagliari, Land Engineering, Piazza d’Armi 16, Cagliari, Sardegna, Italy, 09123 Empty containers must be repositioned among ports to correct trade imbalances. Several sources of uncertainty affect this issue, like supplies and demands at ports, storage and transportation capacities. Although low-quality statistics are available, we present and solve an optimization model considering several realizations of uncertain parameters through expert-based scenarios. |