何境峰952221E164003

何境峰952221E164003

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1 行政院國家科學委員會專題研究計畫成果報告 不同工廠下整合型 TDD/IDD 績效最大化之排程演算法 Optimizing mixed TDD/IDD performance with scheduling algorithm for various factories 計畫編號: NSC 95 2221 E 164 003 執行期限: 95 1 1 日至 95 7 31 主持人:何境峰 執行單位:修平技術學院工業工程與管理系 一、摘要 關於工廠之訂單排程派工問題上,文獻上提出看法很多。大部份都強調以時間績效最 佳化為主的排程方法。如 SPT EDD 派工法則分別達成生產線上訂單們的「平均流程時間」 及「最大延遲時間」兩項指標最小化的績效。雖然這些派工法則可以產生時間方面最大效 益,但卻忽略了以整個工廠為核心考量的整體經濟效益。過去績效評量主要著重在週期時 間和交期,但是限制理論 (TOC) 認為這兩個指標還不夠,因為一但有訂單延遲產生,對工廠 而言訂單金額大小所影響的程度就會不同,所以訂單價值應該區分出他的重要性。而為了 預防訂單遲交導致經常性的提前下料,反而提高了在製品的數量,拉長了整個生產週期時 間。對此不同物料價值的訂單,其加工時間長短也應該予以評量。 TOC 針對此現象提出了 兩個新的評量指標 TDD IDD 的觀念。 TDD 代表延遲交貨之個別訂單金額乘上其相對遲 交時間之加總, IDD 代表物料成本乘上流程時間之加總。因兩項指標都是以「天‧元」為 單位。在此本文提出一個以 TDD/IDD 為基礎的混合型加權績效評量指標 (Z value ) 。此 Z value 在經濟上所代表意義為工廠的延遲和持有兩項成本和,建立的目的在發展出適用於不同類 型工廠整體績效的單一評量值。此外並探討傳統派工法則下對於此 Z value 指標表現如何。並 針對 Z value 指標嘗試發展出啟發式的瓶頸派工法則。 關鍵字:排程、派工、限制理論、績效、瓶頸 Abstract Most researches consider the problems of scheduling rules with the aspect of time improvement such as minimum mean flow time and reduction-maximizing tardiness etc. The SPT and EDD dispatching rules can effectively perform well in terms of time-based indexes individually; but those rules neglect the economic efficiency of dollar-basis for the whole factory. In the past academic research, cycle time and due date are two main measurement indexes; however the theory of constraint (TOC) consider not only the time-basis indexes but also dollar-basis indexes. The impact of delaying to delivery depends on the value of order. Moreover, for preventing the order from being tardiness, the policy of early releasing raw material in advance will cause higher WIP level and increase flow time of throughput. Therefore, TOC addresses the concepts of TDD and IDD, the TDD represents the punishment of tardy deliveries
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2 and the IDD refers material holding cost. This paper creates a novel single mixed TDD/IDD
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This note was uploaded on 11/27/2009 for the course IM MA420 taught by Professor Mar,lee during the Spring '09 term at National Taiwan University.

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何境峰952221E164003

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