砷化鎵代工廠磊晶之最適存貨管理-以W公司為例

The best epi inventory management in GaAs foundry service

敖國玉(Kuo-Yu Ao)

指導教授 ： 陳振明

國立中央大學/管理學院/工業管理研究所碩士在職專班/碩士(2007年)

摘要

高科技產業，其產品生命週期的特徵短且快速，產品價值越到生命週期尾聲越低，因此，產品生命週期的探討和管理也越重要。為了在競爭激烈的市場中具有優勢地位，企業必須隨市場和產品變化做出因應策略。要如何滿足客戶需求：訂定最適之存貨管理、縮短前置期、準時達交提高顧客服務水準，而又能有效降低存貨成本，以增加企業競爭力，讓企業對公司內部以及整個產銷鏈做出更有效的存貨管理，如何在不同有效期限的多產品中決定各種產品的最適訂購量與最適訂購週期使總存貨成本最低，提升顧客服務水準、降低大量資金積壓等問題，提升個案公司的競爭力，讓個案公司同樣有機會能提供無線通訊產業關鍵元件之成本、品質與交期彈性優勢，讓台灣砷化鎵代工產業亦能擠身於世界排名，遂使得因應市場需求的存貨管理成為一項重要的課題，亦是本研究欲探討之動機。 過去都是針對產品生命週期做行銷和組織方面的研究居多，雖然也有針對產品生命週期做需求預測的探討，但並未深入研究當企業面臨多項產品有不同的產品生命週期時，該如何做存貨管理，使得能夠最適化各項產品的存貨管理成本和效率。 本研究利用存貨管理上的單一時期（The Single-Period Model）模式，有時稱為報童問題，來探討有限產品生命週期的影響下，產品該如何做最佳存貨管理以達到客戶期望的服務水準。結合易腐性產品特性與兩階存貨性質：為製造商向供應商訂購單一產品且自行加工成為兩種產品的二階模式。在產品有各自需求假設下，以期望達到顧客服務水準下為目標，訂定製造商的最佳存貨訂購策略。本文共討論兩個模式：第一階段為生命週期為一期的庫存水準、第二階段為生命週期為一期且剩餘存貨可加工的近似模式。並對兩個不同模式下的服務水準與個案公司實際資料作分析，最後比較兩個模式最佳庫存水準與服務水準的最適成本模式。

關鍵字

存貨管理 ； 報童理論

並列摘要

The character of high tech product is that short life cycle and fast turn over rate, more over, the value of product decease dramatically at the end of life near the end of product life cycle. As a result, how to manage product life cycle really play a big role in the highly competitive market. In order to be in the leading position in the market, company need to set the strategy to reflect market trend and product development. The motivation of this research paper is to evaluate how an example company could satisfy customer need in below four prospects, the best inventory management, shorten lead time, on time delivery and lowest inventory cost. Only by meeting above needs could distinguish the company in the industry. Since the inventory management is so important so that his paper is initiated by how the example company could make the best inventory management base on company existing logistic, make the purchase order strategy and best turn over rate for each variable product so that the total inventory cost would be minimum, to improve the customer service level and alleviate the capital intensity pressure. All these measures would help the case company to be in the world rank in its GaAs industry.
In fact, all previous research only dedicate to how marketing and organize product life cycle, but only few papers dedicate to forecast of product life cycle. None of previous paper look into problem of company manage inventory when facing different life cycle and make efficient inventory management.
This research would use the single-period model as known as newsvendor model issue to discuss under scenario of limited product life cycle, how company to do inventory management to meet customer service level. Due to character of easily perishable and two-stage inventory, manufacturer would like to have one single finished product or have to processing product mode. Under itsown demand probability, company would make the best purchase and inventory strategy to achieve lowest cost. This paper would discuss two mode：scenario one is the product life cycle is one term and remaining inventory could not be processed again. The other one is product life cycle is one term and remaining inventory could be processed. The paper would analyze and compare the real data with single-period model of the same service level.
In the last part of paper, I would compare correlation of each service level,inventory level and total cost in the each mode.

並列關鍵字

newsboy model

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