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Optimization of Stacking Strategies Considering Yard Occupancy Rate in an Automated Container Terminal  

Sohn, Min-Je (부산대학교 컴퓨터공학과)
Park, Tae-Jin (부산대학교 컴퓨터공학과)
Ryu, Kwang-Ryel (부산대학교 컴퓨터공학과)
Abstract
This paper proposes a method of optimizing a stacking strategy for an automated container terminal using multi-objective evolutionary algorithms (MOEAs). Since the yard productivities of seaside and landside are conflicting objectives to be optimized, it is impossible to maximize them simultaneously. Therefore, we derive a Pareto optimal set instead of a single best solution using an MOEA. Preliminary experiments showed that the population is frequently stuck in local optima because of the difficulty of the given problem depending on the yard occupancy rate. To cope with this problem, we propose another method of simultaneously optimizing two problems with different difficulties so that diverse solutions can be preserved in the population. Experimental results showed the proposed method can derive better stacking policies than the compared method solving a single problem given the same computational costs.
Keywords
Automated Container Terminal; Stacking Yard; Stacking Strategy; Optimization; Multi-Objective Evolutionary Algorithm;
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