4 research outputs found

    Configuraci贸n de una red de distribuci贸n f铆sica para un operador log铆stico en Bogot谩

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    Trabajo de Investigaci贸nSe presenta un estado del arte acerca de la configuraci贸n de redes con especial enfacis en las opciones que se encuentran en la literatura para la estructura de la red y la localizaci贸n de instalaciones en los distintos nodos de la red para llevar a cabo la distribuci贸n de mercancias por parte de un operador log铆stico de la ciudad de Bogot谩. Adem谩s, la documentacion de un modelo realizado en el semillero de investigaci贸n SILOS de la Universidad Cat贸lica de Colombia, tomando como referente autores de la literatura. Finalmente se propone un m茅todo para contribuir a la toma de decisi贸n en al apertura de instalaciones log铆sticas en la red de distribuci贸n y se anexa preguntas planteadas como apoyo en la puntuaci贸n de los criterios y alternativas que se evaluen con apoyo del m茅todoINTRODUCCI脫N 1. GENERALIDADES 2. CONFIGURACI脫N DE REDES 3. DOCUMENTACI脫N DEL MODELO MATEM脕TICO 4. PROPUESTA USO DE M脡TODO AHP PARA LOCALIZACI脫N CONCLUSIONES RECOMENDACIONES BIBLIOGRAF脥A ANEXOSPregradoIngeniero Industria

    Constraint Programming and Local Search Heuristic: A Matheuristic Approach for Routing and Scheduling Feeder Vessels in Multi-Terminal Ports

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    International audienceIn the liner shipping business, shipping ports represent the main nodes in the maritime transportation network. These ports have a collection of terminals where container vessels can load and discharge containers. However, the logistics and planning of operations differ depending on the vessel size. Large container vessels visit a single terminal, whereas smaller container vessels, or feeder vessels, visit several terminals to transport all containers within the multiple terminals of the port. In this paper, we study the Port Scheduling Problem, the problem of scheduling the operations of feeder vessels in multi-terminal ports. The resulting problem can be identified as a version of the General Shop Scheduling Problem. We consider a Constraint Programming formulation of the problem, and we propose a math-heuristic solution approach for solving large instances. The proposed math-heuristic is a hybrid solution method that combines Constraint Programming with a local search heuristic. The solution approach benefits from the fast search capabilities of local search heuristics to explore the solution space using an Adaptive Large Neighbourhood Search heuristic. During the search, we further use the Constraint Programming model as an intensification technique, every time a new best-known solution is found. We conduct detailed computational experiments on the PortLib instances, showing that the incorporation of Constraint Programming within the heuristic search can result in significant benefits. The high instability in solution quality obtained by local search heuristics can be lowered by a simple combination of both methods
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