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研究生:呂雅婷
研究生(外文):Ya-Ting Lu
論文名稱:不良品可立即退貨之產品於價格預期上漲與不完美檢驗下的EOQ模式
論文名稱(外文):An EOQ Model with Immediate Return for Defective Items under an Announced Price Increase and Imperfect Inspection
指導教授:胡伯潛胡伯潛引用關係
學位類別:碩士
校院名稱:國立虎尾科技大學
系所名稱:工業工程與管理研究所
學門:工程學門
學類:工業工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:47
中文關鍵詞:EOQ不良品立即退貨價格上漲檢驗誤差
外文關鍵詞:EOQdefectivesimmediate returnprices increaseinspection errors
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由於生產技術的進步,同類型產品間的生產成本、功能和品質的差異已逐漸縮小,所以售價、性能、乃到品質已不再是產品於市場上競爭的關鍵因素,代之而起的是能否及時滿足消費者的需求。因此,為了因應市場需求的不確定性,廠商或多或少都必須備有存貨。所以,企業為了滿足消費者對產品的需求,都會準備存貨來因應各種可能的狀況。

傳統的EOQ模型最基本的假設是:產品皆為良品且其價格不變。然因原物料品質之不良、製程的不穩定或操作上的不當,常會有不良品的產生;惟因零售通路商的日趨強勢和消費者對品質之要求日趨嚴格,所以不良品常會被立即退回給供應商。然而,為因應原物料的上漲,產品供應商可能會於某一時間宣佈調漲產品的價格。另外,在百分之百檢驗時亦可能會發生檢驗誤差(型I和型II)。所以如何在價格預期上漲與檢驗誤差下來設定適當的存貨量是值得探討的問題。

本研究之目的分為兩部份,第一即是針對進貨中檢驗出之不良品可立即退貨之產品,探討在價格預期上漲下之最佳訂購批量;第二是針對進貨中之不良品於百分百篩選檢驗中會有檢驗誤差,且判定為不良品會立即退貨之條件下之最佳訂購批量。其結果顯示為:(1)價格預期上漲下是價格預期上漲在某個週期之檢驗完畢時點前後或在某個週期之起點上三種情形,其結果為不管在那個時點漲價,良率對特殊採購量會有最大值;(2)產品以百分之百篩選檢驗會有檢驗誤差之條件下有型I誤差和型II誤差二種情形,其結果為型I誤差對最佳經濟訂購量有明顯之影響,而型II誤差對最佳訂購量之影響並不明顯。
As the progression of production technology, the difference in production cost, the function and the quality between the same type products has been shorten. Thus, the price, the function and the quality has no longer been the critical factor for the products to compete with others in the market, instead, how to fulfill the requirement of customers instantly is more important. Therefore, the manufacturers must maintain proper inventory for the uncertainty of marker demand. Consequently, the business always keeps enough inventories in order to fulfill the demand of customers in any possible cases.

The traditional EOQ model has two basic assumptions: the products are perfect and their prices are constant. However, in practice, because of the variance in raw material and/or in manufacturing process, the production of defectives is usually inevitable. Besides, due to fluctuation on the prices of raw materials, suppliers of product may announce a price increase that is effective after a pre-specified time. Thus, the buyer may generally reduce his/her total purchasing cost by placing a larger quantity of order before the price increase takes effect. Else, because the inspection testing fails to be perfect, two types (Type I and Type II) of errors can occur. Therefore, how to set a proper inventory under an announced price increase and inspection errors will be a considerable issue.

There are two goals in this article. The first one is to investigate an EOQ model with immediate return for imperfective items under an increase of price. Another purpose of this paper is to investigate and EOQ model with immediate return for imperfective items under imperfect inspection. The results show that: (1) an increase of prices are the three situations for in screening of some cyclic finished around the point in time or to start in some cyclic results of, good items will have the maximizing value to the special quantity purchasing whether in that point in time increase of price; (2) the products in 100% screening have the inspection errors to occur are Type I and Type II errors results of, Type I error of the best economical order quantity has obvious effect, Type II error of the best economical order quantity has not obvious effect.
中文摘要……………………………………………………… i
英文摘要……………………………………………………… ii
誌謝 ……………………………………………………… iv
表目錄 ……………………………………………………… vi
圖目錄 ……………………………………………………… vii
第一章 緒論………………………………………………… 1
1.1 研究背景與動機…………………………………… 1
1.2 研究目的…………………………………………… 3
1.3 研究架構…………………………………………… 3
第二章 價格預期上漲下不良品可立即退貨之EOQ模型… 5
2.1 符號與假說………………………………………… 5
2.2 模型建立…………………………………………… 6
2.2.1 傳統EOQ模型……………………………………… 6
2.2.2 不良品可立即退貨之EOQ模型…………………… 7
2.2.3 考慮價格預期上漲………………………………… 9
第三章 不完美檢驗下最佳訂購量………………………… 29
第四章 數值範例…………………………………………… 37
4.1 價格預期上漲……………………………………… 37
4.2 不完美檢驗………………………………………… 39
第五章 結論與未來研究方向……………………………… 44
5.1 結論………………………………………………… 44
5.2 未來研究方向……………………………………… 45
參考文獻……………………………………………………… 46
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