Establishing a Bottleneck Management Model for Wafer Fabrication Factories Using Northwest-corner Method

• Main Authors: Wang, Li-Feng, 王麗芬
• Other Authors: Tong, Lee-Ing
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/48016409725317125347

碩士 === 國立交通大學 === 管理學院工業工程與管理學程 === 100 === Generally speaking, cost of equipments could claim 70%~90% of capital expenses of a new plant. The fixed overhead of equipments for different wafer size foundry accounts for the largest proportion of the cost. The depreciation of equipment will be assigned to the fixed overhead. The percentage of fixed overhead that accounts for wafer unit cost varies from equipment to equipment due to depreciation. Thus, it is very essential for all wafer foundries to increase the utility of equipments. The most important responsibility of an industrial engineer (IE) is to design the most effective capacity planning for a plant. Static capacity planning (SCP) is the most common method for doing long-term capacity plan. The equipment loading can be evaluated very quickly through SCP under some kind of product combinations. However, equipment limitations are usually not included in SCP simulation model. Therefore, to resolve this problem, one better approach is to dissolve equipment limitations. Objective of this study is to develop a new management model to improve the main drawback of SCP using northwest-corner method. Finally, a real case from a Taiwan wafer foundry is utilized to demonstrate the effectiveness of the proposed method.