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題 名 | 以限制理論為基礎的晶圓製造系統派工法則的研究=A TOC-Based Job Dispatching Method for Semiconductor Manufacturing |
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作 者 | 謝淑華; 侯凱中; | 書刊名 | 國立臺灣大學工程學刊 |
卷 期 | 87 2003.02[民92.02] |
頁 次 | 頁97-108 |
專 輯 | 「機械工程」專輯 |
分類號 | 494.542 |
關鍵詞 | 派工法則; 限制理論; 系統資源; 獲利; Dispatching rules; Theory of constraints; System resources; Profit; |
語 文 | 中文(Chinese) |
中文摘要 | 生產事業都需要依賴營利以維持生存,大多數的傳統製造業基本上採用生產線的方式,在製品鮮有回流加工的現象,因此大部分在製品在某一製程的獲利基礎相似,於是大多數的派工法則即使以限制理論為基礎,所期望加強的為物流,而不討論金流。但對晶圓製造系統而言,回流現象嚴重,某一製程的在製品獲利基礎可能相去甚遠。但目前晶圓製造系統仍以物流的觀點建立派工法則,以致於機台的派工決策,常常不能直接引領系統至最佳獲利。 本研究擬提出以產品獲利能力為判準的派工法則。所提出的法則仍以限制理論(Theory of Constraints)的觀點出發,藉著在製品的系統產能資源消耗量,提出晶圓在製品成本、現階段價值和獲利強度的估算法,並發展出一系統化的限制理論基礎派工法則(Dispatching by theory of Constraints, DTC),以期使得高獲利能力產品的生產反應速率加快、囤積成本下降,而達到系統整體獲利能力提昇的目標。本研究以模擬模型,進行DTC、MCR和MBS法則生產獲利的績效評估。模擬實驗結果發現,MCR、MBS派工法則不具備檢視產品獲利的能力,而DTC法則可提高獲利能力高的產品的生產反應速率,且將囤積成本有效降低,並改變在製品加工時間的分佈,不良率降低。 |
英文摘要 | Most of the traditional manufacturing systems apply flow-line layout, and there is very few phenomenon of reentrance. The values of all WIP in a station are similar. Therefore, the maximum throughput always leads the maximum profit. This results throughput is used as an indicator in determining optimal dispatching rules. In a wafer fabrication system, products have to re-visit machines many times. The value of a lot of WIP in a station is very different from that of another lot. The number of layer processes increases the value of wafer. The dispatching rules based on maximum throughput no longer leads maximum profit. The main purpose of this study is to develop a profit-based dispatching rule by the theory of constraints (TOC) for wafer fabrication. In this study the present costs and values of WIP wafers based on the consumption of system resources are estimated. The profitability of each WIP wafers is thus derived. By comparing their associated profitability of a time unit among all WIP wafer lots, the one with highest profitability is selected to be processed next. A profit-based dispatching rule named DTC (Dispatching by theory of Constraints) is therefore developed. For the purpose of evaluation of the proposed DTC, a wafer fabrication simulation model is built in this study. Besides using DTC to dispatch jobs, MCR and MBS dispatching rules are adopted, respectively. Simulation results reveal that MCR and MBS do not respond to profit, while DTC does. Simulation results show that DTC does lead high-profit-wafers to short cycle times, and thus reduces the WIP inventory effectively. |
本系統中英文摘要資訊取自各篇刊載內容。