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This paper evaluates the performance of a VMI hub which supplies bare glasses to LCD manufacturers. We construct a simulation model to describe the operations of a third-party logistics provider that imports, stores, and delivers glass panels on behalf of an international supplier. Ordering and inventory decisions will affect service level and operating cost of the 3PL. Under the new VMI proposal,...
This study analyzes automated storage and retrieval systems (AS/RSs) under multi-aisle storage environment. The focus is on the choice of S/R machines, single shuttle or twin shuttle. Since a twin shuttle system is about 40% more expensive, its throughput capacity should outperform a single shuttle system by at least 40% to justify its cost. Simulation experiments suggest that twin shuttle systems...
An automated storage and retrieval system (AS/RS) can be equipped with the traditional single shuttle or the newly developed twin shuttle. There has been a significant literature on the comparison of single shuttle versus twin shuttle systems. Researchers agree that the twin shuttle system has better operating performance. However, constructing a twin shuttle system costs 40% more than constructing...
This paper describes a multi-objective evolutionary algorithm which targets primarily on "expensive" simulation-based optimization problems. The idea is to approximate the Pareto optimal front using response surface methodology and screen out less promising offspring solutions before they are evaluated via simulation runs. Numerical examples suggest that the algorithm can save computational...
Simulation output analysis has received little attention comparing to modeling and programming in real-world simulation applications. This is further evidenced by our observation that students and beginners acquire neither adequate details of knowledge nor relevant experience of simulation output analysis in traditional classroom learning. With the advances in the Internet learning environment, web-based...
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