Using TOC Demand Pull to Improve the Inventory Management of Dummy & Control Wafers - A Case Study on Foundry M

• Main Author: 高一正
• Other Authors: 張永佳
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/07274065890024132606

碩士 === 國立交通大學 === 管理學院工業工程與管理學程 === 100 === Semiconductor industry has been developed over 40 years. It has been known as a capital and technical intensive industry. The yield of wafer manufacturing process is a key factor to decide the manufacturing cost and a stable equipment condition is a must to sustain the wafer manufacturing yield. Wafer foundry has been using dummy & control wafers to stabilize and monitor its manufacturing condition of the semiconductor equipment for a long time, once there is a shortage of the dummy & control wafers, the manufacturing equipment would be stopped. To avoid manufacturing lost, production line needs to keep large amount of stock for dummy & control wafers. At the mean time, the large amount of stock on dummy & control wafers have created a lot of cost waste and capital burden. This study is using the Inventory Level of M Semiconductor Foundry as an example. Based on the Theory of Constraints (TOC) and via actual data simulation and verification, this study is applying both the Demand-Pull Replenishment Inventory Control and Dynamic Buffer Management to prove that Demand-Pull Replenishment Inventory Control method is more effective than current Forecast Demand Inventory Control method. Furthermore, under the wafer shortage free condition, management team is able to keep a lower inventory level and enhance the competition of a wafer foundry.