半導體廠因其設備昂貴生產流程複雜，派工是否有效率對提高機台之使用效率、整體生產效率及機台使用率有相當程度的影響。派工法則雖然眾多，但其主要的目的有優化產量、週期時間、機台使用率、瓶頸機台使用率或最低成本考量，然而從企業整體的角度觀之，影響最終結果的主要因素有達交率、利潤、和顧客關係之考量。本研究以『達交率』的改善作研究，製造過程中有許多影響達交率的原因，但是最直接的原因是在工作站前等候加工的時間過長，因此希望藉由過去歷史的『等候時間分配』的方式，將加工批次達交前做有效率的將等候時間分配於各個工作站，使產品的生產週期時間更加穩定，以提昇達交率。
此外，派工法則的重要性是取決於客戶的需求，藉由處理產品在工作站前的等候時間，使等候時間可以合理的分配，準確的控制達交情況，以滿足客戶各種不同交期的挑戰；在研究過程中以eM-Plant 模擬軟體建立兩個模擬系統，一是MiniFab 半導體廠雛形系統(prototype system)，一是ASU 公開的一般半導體工廠系統，用這兩個模擬系統與常用之派工方式比較其績效優劣。實驗結果顯示本研究之派工法則在達交率上均優於FIFO、GFIFO、CR、EDD 及時間加權過站值方法。

Because of the manufacturing process complexity in semiconductor manufacturing, dispatching has been an important factor to the overall fab productivity and equipment effectiveness. Although there are numerous dispatching methodologies, Most almost all of them are designed from the production perspective. A great majority of them are based on the optimization of production, cycle time, equipment utilization, bottleneck machines, etc. This study used target hit rate as the major performance good for dispatching with additional reference of production and cycle time per layer.
The process time and transport time for a lot are more or less predictable. It is time waiting time that not only contribute majority of time a lot spent in a fab but
also is the main target of influence by order releasing and dispatching method. This research proposed a waiting time allocation scheme to allocate available waiting time to each process based on historical data. The allocated waiting times for the lotsin the same process buffer are used for priority comparison as far as dispatching isconcerned.
Simulation tests using data from Minifab and Arizona State University indicated that the proposed WTA method is better than some commonly used dispatching rules such as First In First Out (FIFO)、Global First In First Out (GFIFO) 、EDD (Earliest Due Date) 、CR (Critical Ratio) and Weight Turn
Ratio(WTR) .

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