臺灣博碩士論文加值系統

在存貨管理領域中許多的研究都是以經濟訂購量(EOQ)模式為基礎，考慮現實環境的改變而修改部分假設，使建構的模型更能符合實際的應用。長久以來，單位持有成本經常被視為一固定的常數；直至最近，學者Billington (2003)才提出單位持有成本可透過增加投資支出而加以縮減的概念，而該研究仍以需求為已知的傳統EOQ模型為基礎。在現實的環境中，未來的需求充滿著不確定性，本論文的主要目的即是拓展Billington的研究至需求不確定的環境。
本研究是以一般常見的隨機性存貨模型為基礎 (即連續盤查及週期盤查存貨模型)，但放寬單位持有成本為常數的假設，進而建構單位持有成本可投資縮減的隨機性存貨模型。文中針對產品流動速度的快慢，分別考慮前置時間內之需求量(連續盤查)及保護期間內之需求量(週期盤查)為常態分配及Laplace分配兩種情形。在總成本最小化的目標下，透過計量方法分析模型之特性，並建立求解演算法，探討企業的最適投資及存貨策略。

In most of the early literature dealing with inventory problems, holding cost is viewed as a prescribed constant and is not subject to control. In practices, holding cost could be reduced by extra expenditure; in other words, it is controllable. Recently, Billington (2003) presented this idea and modified the classic EOQ model to include a reduction in the per-unit holding cost. One of the basic assumptions of EOQ model is that the demand is deterministic, while it is often with uncertainty. The aim of this research is to extend Billington’s work to the uncertain environments.
In this thesis, we propose two stochastic inventory models with holding cost reduction, based on the well-known continuous review and periodic review inventory systems. The demand during lead time (continuous review) is formulated by the Normal and Laplace distributions, concerning the fast- and slow-moving items, so does the demand during protection interval (periodic review). The objective is to minimizing the expected total annual cost by simultaneously optimizing the order quantity/review period, reorder point/target level and per-unit holding cost. For each model, a solution procedure is developed to find the optimal solution. Numerical examples along with sensitivity analysis are provided to illustrate the results of proposed models.

目錄
表目錄 iii
圖目錄 iv
第一章 緒論 1
1.1 研究動機與目的 1
1.2 相關文獻探討 3
1.2.1 改變給定之相關文獻 3
1.2.2 連續盤查存貨模型中改變給定的研究 4
1.2.3週期盤查存貨模型中改變給定的研究 5
1.2.4持有成本縮減的研究 5
1.3 本文研究結構 6
第二章 單位持有成本可縮減的連續盤查存貨模型 9
2.1 符號說明與假設 10
2.2 模型建立 11
2.3 模型求解過程 13
2.3.1 前置時間內需求量為Laplace分配 13
2.3.2 前置時間內需求量為常態分配 17
2.4 數值範例及敏感度分析 18
第三章 單位持有成本可縮減的週期盤查存貨模型 24
3.1 符號說明與假設 24
3.2 模型建立 26
3.3 模型求解過程 28
3.3.1 保護期間內需求量為Laplace分配 28
3.3.2 保護期間內需求量為常態分配 31
3.4 數值範例及敏感度分析 33
第四章 結論 40
4.1 主要研究結果 40
4.2 未來研究方向 43
參考文獻 44
附錄A 49
附錄B 52
附錄C 53

表目錄
表2-1 演算法一的求解結果 19
表2-2 模型與 模型之最佳解比較表-Laplace分配 19
表2-3 模型與 模型之最佳解比較表-常態分配 20
表2-4 連續盤查模型之敏感度分析表-Laplace分配 22
表3-1 演算法二的部份求解結果 34
表3-2 模型與 模型之最佳解比較表-Laplace分配 35
表3-3 模型與 模型之最佳解比較表-常態分配 36
表3-4 週期盤查模型之敏感度分析表-Laplace分配 38

圖目錄
圖1-1 本文結構之流程圖 8

參考文獻
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中文部份
林清河(民84)。物料管理。臺北市：華泰。
楊文鐸(民89)。流動速度於不同產品壽命週期之存貨政策研究。國立台灣科技大學工業管理系博士論文，未出版，台北市。