備用件存貨箕理政策之研究－以卉導體設備業為例

Abstract

本篇論文主要研究台灣半導體設備業備用件供應的存貨管理政策。由 於設備業者的備用件供應服務品質，對於其未來相關設備的銷售有決定性 的影響，因此備用件的存貨管理，對設備業者而言是相當重要的課題。在 備用件的供應方面，制定一套有效的存貨政策實有其必要性。 本研究 的目的在發展一套適合備用件供應的存貨政策。有鑑於此，本研究根據 VMI的觀念，提出一（ti, s, S）存貨政策，同時考量需求和供應的層面 ，並結合連續盤檢的（s, S）型存貨政策。此一存貨政策具有提昇顧客服 務水準、降低總存貨成本，以及提高存貨週轉率等潛在優點。 根據本 研究所得的結果，有充分的證據指出，在相同的存貨水準之下，以VMI為 基本理念所發展出的（ti, s, S）存貨政策較傳統的（s, S）存貨政策能 獲致較佳的顧客服務水準和較低的總存貨成本。換言之，採用（ti, s, S ）存貨政策對於提昇顧客服務水準和降低總存貨成本有正面的影響。 從Duncan複平均數距檢定法的結果顯示，當s在高水準、S在低水準，而ti 在低至中水準的組合下，將會獲致高顧客服務水準和低存貨成本。同樣地 ，只要s和S訂在中水準，不論ti在何水準下，也都能得到高顧客服務水準 和低存貨成本。一般而言，只要s和S能適當地設在正確的水準下，三種ti 水準都能獲得高服務水準和低存貨成本。 This research explores the inventory policy of a spare part supplier in semiconductor equipment industry in Taiwan. Efficient customer service is essential to the supplier as it affects the sales directly. Inventory management of the spare parts, therefore, is one of the most important activities for the supplier. In such a service system, an efficient inventory policy is essential. The objective of this research is to develop an appropriate inventory policy for the spare part supplier. A VMI-based inventory policy, (ti, s, S), which can be properly referred to as a stocking policy for customer i, for joint consideration of demand and supply by incorporating a continuous review (s, S) type inventory policy. The potential advantage of the developed inventory policy is to improve customer service level, to reduce total inventory cost, and to increase inventory turns. The result of this research presents sufficient evidence to indicate that the VMI-based (ti, s, S) policy results in higher customer service level and lower total inventory cost than (s, S) policy does under same stock levels. In other words, when adopting the (ti, s, S) policy, positive effects in the increase of customer service level and decrease of total inventory cost can be obtained. From the result of Duncan's test, it reveals that combinations of high s, low S, and low to medium ti will result in high customer service level and low inventory cost. Similarly, as long as s and S are both at medium levels, high customer service level and low inventory cost will be obtained no matter what levels of ti value are. In general, all three levels of ti will give higher customer service level and lower inventory cost if s and S are properly set at the corresponding correct levels.