1B3 ADVANCED WIP CONTROL METHOD FOR SEMICONDUCTOR MANUFACTURING(Technical session 1B : Meta Heuristics) :

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We develop a hierarchical distributed production planning and control methodology, called DISCS, for a large and unstable semiconductor manufacturing process. The upper layer of DISCS periodically decides adequate work-in-process inventories (WIP) levels to meet demands. And, in the lower layer, dispatching decisions are made at each workstation to keep the fixed WIP level. Computational experiments with wafer fabrication process data show that DISCS, when compared with a traditional control method, succeeds in making less gaps between outputs and demands while keeping lower WIP level. Therefore, we conclude that DISCS is a promising methodology for production planning and control in semiconductor manufacturing.

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