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Title: Maritime Empty Container Repositioning with Inventory-based Control
Authors: LUO YI
Keywords: Empty Container Repositioning, Inventory Control, Simulation, Optimization
Issue Date: 14-Aug-2012
Source: LUO YI (2012-08-14). Maritime Empty Container Repositioning with Inventory-based Control. ScholarBank@NUS Repository.
Abstract: One of the challenges that shipping companies face today is to effectively manage empty container in order to meet customer demand and to reduce operation cost. In this study, we focus on the empty container repositioning (ECR) problem with inventory-based control policies in maritime shipping systems. We first address the joint ECR and container fleet sizing problem in a general multi-port system with considering a single-level threshold policy. Two approaches, a non-linear programming and a gradient search approach with Infinitesimal Perturbing Analysis (IPA) estimator are proposed to solve the problem. Then, extending the previous multi-port system to a complex liner shipping system with multi-service, multi-port and multi-vessel, we formulate the problem in a time-driven way and apply convergent optimization via most-promising-area stochastic search (COMPASS) method to solve the problem. To improve the efficiency of sampling scheme in COMAPASS, a hybrid coordinate and gradient sampling scheme with simultaneous perturbation stochastic approximation (SPSA) is proposed.
Appears in Collections:Ph.D Theses (Open)

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