| Summary: | 碩士 === 國立交通大學 === 管理學院工業工程與管理學程 === 100 === Non-productive wafer expenditure plays an important role for material cost in semi-conductor plant . It is composed of 2 sources - brand new dummy wafer and reclaim wafer . brand new dummy wafer is raw wafer which is not used ever by production line . When brand new dummy wafer is used in production line for several times , the condition for it will become worse and can not conform with criterion for re-use . Then , it will be sent to reclaiming process for wafer surface treatment ,called reclaim process .Most of semi-conductor plants outsource this process to third party called reclaim house .After reclaiming of non-productive wafer , it will be able to reuse in production line with the same quality as brand new dummy wafer . More non-productive wafers successfully reclaimed from reclaim house will reduce usage cost of brand new dummy wafer . Hence,performance for reclaim house will be key factor to influence the expenditure of whole non-productive wafer expenditure ,because good performance reclaim house will create cost benefit to whole non-productive wafer cost and reduce cost of non-productive wafer .
In light of lack of an effective cost estimation model for a specific reclaim house of the surveyed semi-conductor plant to determine whether this reclaim house provides a lower cost reclaim operation than others, this study intends to develop a simple and effective method to estimate the whole cost incurred by operations of a reclaim house instead of only using purchase cost to judge a reclaim house's cost performance .This model includes purchase cost , shortage cost ,inventory-holding cost and transportation cost to estimate how much a reclaim house costs for its reclaim procedure. The basis for this model is historical data collected from ERP system, Enterprise resource planning system .The result of this study shows this cost estimation model effective to reduce the whole non-productive cost. Thus ,it can serve a method for a purchaser or material supply planner to estimate a reclaim house with a real lower cost for its reclaiming operations.
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