Abstract
This paper presents an integrated release and dispatch policy for semiconductor wafer fabrication. In this policy, the concept of virtual production lines (VPLs) is first introduced to allocate production time for each process step, and the average queuing time information is derived from the target WIP distribution which is obtained by simulations. Then, a pull VPLs-based effective-workload control (EWL-n-Ctrl) policy is proposed to control the release process, and a queuing time ratio (QTR) rule is put forward to control the dispatch process. The behaviour of EWL-n-Ctrl is analysed using the Mini-Fab model. Results of the numerical experiments show that the integrated release and dispatch policy (EWL-n-Ctrl+QTR) outperforms common rule-based scheduling policies in terms of the average cycle time, the standard deviation of the cycle time and the work in process under a prescribed throughput level. A simulation study into the effect of capacity utilisation levels and product mix ratios is also carried out.
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