# 臺灣博碩士論文加值系統

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 本論文主旨是利用METRIC模式以探討多階存貨系統的存貨整合問題。文中將原先的二階存貨系統擴展到三階存貨系統，使將原本求得的區域最佳解能夠轉換成為系統最佳解，且藉由實驗的分析可以驗證出METRIC的適用範圍，並且定義METRIC當中所需參數的設定適合範圍，以使METRIC模式求出的近似解和正確解的差距可在一定合理範圍之內。 本研究首先定義一包含單一倉儲和多個零售商的二階存貨系統，該系統採行逐一補貨策略處理訂單，我們利用METRIC模式求解缺貨數目的期望值，以達系統中缺貨成本最小化，並發展出一套正確解法以便驗證METRIC模式求出的近似解。本研究進一步定義一包含單一供應商、多個倉儲以及各倉儲底下多個零售商的三階存貨系統，該系統各項假設同於二階存貨系統，同樣利用METRIC模式求解缺貨數目的期望值，並且發展出正確解法與METRIC模式求出的近似解進行比較。 由本論文可以發現：METRIC模式適用範圍為低需求的高價值產品，故一般經常運用於航空業和軍事產業零件補充上。透過正確的參數設定，我們可以將METRIC所求出的近似值逼近正確解，以便求出一合理數值。
 The purpose of this thesis is to investigate the inventory integration problem in the multi-echelon inventory system. We expand the two-echelon inventory system to the three-echelon inventory system to achieve the global optimization. We will verify the application range of the METRIC model and decide the reasonable range of parameter setting by running the numerical results, in order to reduce the difference between the METRIC approximation and the exact solution. We consider a two-echelon inventory system consists of one warehouse and multiple retailers, which follows the one-for-one inventory policy, and formulate the METRIC model to find the expected number of backorders by minimizing the backorder cost. We then develop the exact solution method corresponds to the METRIC approximation solution method. Furthermore, we consider a three-echelon inventory system consists of one supplier, multiple warehouses and multiple retailers, which has the same assumptions as described in the two-echelon inventory system. Again, we develop the exact solution method corresponds to the METRIC approximation solution method. In this study, we found that the METRIC model is appropriate when the demand is low, which can be applied such as in the Air Force and the military industry. By the accurate parameter setting, we can show that the solution found by the METRIC model is close to the exact solution.
 Abstract iTable of Contents iiiList of Figures vList of Tables viChapter 1 Introduction 11.1 Preface 11.2 Motivation of the Study and its Objectives 21.3 Scope and Process of the Study 41.4 Framework of the thesis 4Chapter 2 Literature Review 72.1 Inventory Policy 72.2 Inventory system 92.2.1 Multi-level-inventory system 102.2.2 Two-Echelon Inventory System 112.3 Multi-echelon Technique for Recoverable Item Control (METRIC) 122.3.1 Introduction 122.3.2 Mathematical Assumption 132.3.3 Recoverable Item versus Consumable Item 152.4 Conclusion 16Chapter 3 Problem Formulation 173.1 System Characteristic 173.2 Model Framework 183.2.1 Basic Assumption 183.2.2 Notation 183.3 METRIC Approach 203.3.1 Two-echelon Inventory System 203.3.2 Three-echelon Inventory System 213.4 Exact Solution 243.4.1 Two-echelon Inventory System 243.4.2 Three-echelon Inventory System 25Chapter 4 Computational Experiments 294.1 Parameter Setting 294.2 Computational Experiments of Two-echelon Inventory System 294.2.1 Computational Experiments for Demand Intensity 294.2.2 Computational Experiments for Order-up-to Inventory Position 324.2.3 Computational Experiments for Lead Time 344.3 Computational Experiments of Three-echelon Inventory System 354.3.1 Computational Experiments for Demand Intensity 354.3.2 Computational Experiments for Order-up-to Inventory Position 414.3.3 Computational Experiments for Lead Time 424.4 Comparison 44Chapter 5 Conclusions 45Reference 47Appendix 50
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 1 存貨協調及資訊共享對供應鏈整合之影響 2 CPFR流程下的補貨模型 3 演化策略於三階後勤架構之可修護備份件最佳化應用

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