Two-step simulation method for automatic material handling system of semiconductor fab
Robotics and Computer-Integrated Manufacturing
Improved Empty Vehicle Balancing in Automated Material Handling Systems
UKSIM '08 Proceedings of the Tenth International Conference on Computer Modeling and Simulation
Multiple-objective scheduling and real-time dispatching for the semiconductor manufacturing system
Computers and Operations Research
Preemptive scheduling in the presence of transportation times
Computers and Operations Research
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The production lot of higher priority should enjoy the privilege of transportation on the shop floor because of either tough market competition or customer's urgent requirements in 300 mm semiconductor manufacturing. However, based on the long term observation of wafer diffusion factories, the traffic jams happen frequently, when the overhead hoist transport is loading or unloading. This kind of traffic jams will definitely hamper the performance of the delivery of the products, specifically for those high priority lots. Therefore, this paper develops an effective dispatching rule, named heuristic preemptive dispatching rule to resolve this critical subject. This study uses a simulation method for a 300 mm wafer manufacturing factory to analyze the issue and verify the results. Compare with the recent differentiated preemptive dispatching, the results demonstrate that the proposed method by this study can expedite the movement of lots and reduce lot transport time significantly with no additional investment of resources. This is a very big advantage for the capital intensive wafer manufacturing companies.