Production Control in Multi-stage Tandems Systems under Sequential Process Queue Time Constraints

• Main Authors: Chun-Hsiang Tseng, 曾俊翔
• Other Authors: 吳政鴻
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/54678291343959728704

碩士 === 國立臺灣大學 === 工業工程學研究所 === 100 === Sequential process queue time constraints are important properties in semiconductor and TFT-LCD manufacturing. In these factories, any time violation will result in significant scrap or rework costs. Besides, most process in those industries are stochastic. Without accurate production control in such systems, production yield rate will decrease and production cost will increase. This research considers sequential process queue time constraints in multi-stage tandems production systems. The objective is to minimize production costs which are include inventory holding cost and scrap cost. We use dynamic programming and uniformization method to model these systems. However, the model is too complex to solve in feasible time. Therefore, we use decomposition and pairing heuristic control (PHC) policy to fix complexity problem. To verify the robustness and effectiveness of the proposed model, we use discrete event simulation (DES) to compare the performance of PHC with other policies’ in literatures.