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博碩士論文 etd-0621102-150926 詳細資訊
Title page for etd-0621102-150926
論文名稱
Title
以同步化流徑搭配方式發展系統動力學模式高槓桿解設計方法之研究
A Dynamic Alignment Approach to the Leverage Design in System Dynamics Models
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
119
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2002-06-10
繳交日期
Date of Submission
2002-06-21
關鍵字
Keywords
高槓桿解、系統動力學、搭配設計、同步、流徑
alignment, leverage design, system dynamics
統計
Statistics
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中文摘要
在缺少適當理論與方法的輔助下,管理者與設計者對動態問題系統的分析與解釋經常基於蒙昧與錯誤的假設,無法以系統整體觀點進行各政策行動間的動態搭配設計。系統動力學是專門處理動態複雜系統問題的理論、方法、與工具,可建構動態複雜系統背後的問題結構。如何在建構複雜的系統結構後,發展與設計最具槓桿作用的改善政策為系統動力學的重要議題。然而,回顧現有系統動力學高槓桿解設計方法相關研究,可發現絕大多數的高槓桿解設計方法所得出的政策建議往往欠缺實質的管理意義,同時也與系統動力學拆解與建構問題結構的基本觀點有所出入。

針對系統動力學方法所建構出來的問題系統結構,本研究以影響系統狀態變化的流徑為分析單位。在達成系統整體目標的前提下,設計各流徑之間的搭配運作關係,決定系統內所有可控決策的決策規則。這套以流徑搭配設計為基礎的高槓桿解設計方法之核心,在使控制流徑運作的率量決策存取共同的資訊,並設定各流徑在同一時間點產出相同比率或數量的決策規則,使各流徑在運作量與運作時間上達到同步運作搭配的設計方法,故稱為同步化的流徑搭配方法。同步化流徑搭配方法包含四個部份,首先設定系統運作的基調。其次找出並決定與該運作步調同步運作的流徑,設計對應率量的決策函數。接著透過所發展的時間延遲處理機制,補足率量決策函數和實際流徑產出之間因時間延遲所造成的差距。在系統整體目標下設計流徑間的同步搭配關係後,再調整個別積量的期望狀態值。

經過與其他高槓桿解設計方法比較與各類的情境測試之後,本研究證明所發展的同步化流徑搭配方法可應用在成長導向或是穩定導向系統,並兼顧系統績效的改善的有效性與穩健性。這套高槓桿解設計方法除了提供更具改善效果與更具實質意義的政策建議外,也考量時間因素而建立動態高槓桿解設計方法之先驅。


Abstract
This paper attempts to develop a dynamic alignment approach to leverage design of system dynamics models. The approach developed in this research is a flow-based design, different from traditional macro designs of aggregated system structures or loop analysis. It is grounded on some major concepts in Synchronous management at plants and uses the Drum-Buffer-Rope (DBR) system to align the various operations of rate decisions. This paper takes two famous system dynamics models as examples to examine the performance of the proposed leverage design method. One is the customer-producer-employment model, and the other is the market growth model. Both of the models are developed by Forrester(1961; 1968). By applying the dynamic alignment approach, the redesigned customer-producer-employment system shows that the original oscillation behavior can be fully eliminated, and the redesigned market growth model can sustain its growth pattern instead of stagnation or collapse. By comparison with previous high leverage design methods, the dynamic alignment approach developed in this paper is proved to be more efficient and robust for system redesign in different scenario.

目次 Table of Contents
目錄


1.緒論…………………………………………………………………..……….1
1.1. 研究背景與動機…………….……..………………..…………...……1
1.2. 研究目的………………….……..…………………..…………...……4
1.3. 論文架構………………….………………………....…………...……6

2.文獻探討……………..……………………………………………………. 9
2.1.系統動力學高槓桿解設計方法相關文獻………..…………………. 9
2.2. 多決策或多行動間搭配關係設計之相關文獻……….………….. 16
2.2.1. 工作站間搭配關係的設計….….……...……..…………….. 17
2.2.2. 同步化的流徑搭配方式..………..…...…………………..… 21
2.3. 同步化調整控制的重要特性…………….…….………..…………. 27
3. 同步化流程搭配方法的開發…...………………………..…………… 36
3.1. 同步化流徑搭配方法的設計原則………………………..………... 36
3.1.1. 由系統特性建立設計原則…………………………………. 36
3.1.2. 由流程特性建立設計原則……………………….…...……. 39
3.1.3. 由流徑間交互關係之特性建立設計原則……..…………... 43
3.2. 同步化流徑搭配關係的設計步驟…………………………………. 45
3.3. 時間滯延處理機制…………………………………..…….…...…... 51
3.4. 緩衝大小與穩定水平調整機制…….………..………….…………. 56
3.5. 小結…………………………………………………………………. 58
4. 方法的實作與評估…….……...……………………………….………. 59
4.1. 案例模式的選取………………………………..……...…..…….… 59
4.2. 穩定導向系統實作-生產商、雇員、與存貨模式……………… 60
4.2.1. 案例介紹…………..………………………..………………. 60
4.2.2. 方法實作…………………………………..………………... 63
4.2.3. 模擬與評估………………………………..………………... 72
4.3. 成長系統範例-成長與投資不足模式…………………………… 88
4.3.1. 案例介紹……………………………………………………. 88
4.3.2. 方法實作……………………………………………………. 89
4.3.3. 模擬與評估…………………………………………………. 92
4.4. 小結…………………………………………………………….…… 95
5. 結論與後續研究建議……………………………………..…………... 96
5.1. 研究的總結與貢獻…………………....………………..…………... 96
5.2. 研究限制………………………………………………..…………... 98
5.3. 後續研究建議…………………………………………...………….. 99



參考文獻………………………………………………………………….. 101
附錄一「客戶、生產、與雇員系統模式」之方程式……………… 107
附錄二「市場成長模式」之方程式…………………………..……… 117
附錄三、重要專有名詞對照表………………………………………119



圖、表目錄


圖1-1 論文架構 ……………………………………………………………. 7
圖2-1 集中與分散的資訊連接形式 ……………………………………… 22
表2-1 各生產系統的網線連接結構 ……………………………………… 23
圖2-2 系統動力學模式表徵下的比例控制結構………………………….. 28
圖2-3 比例控制中偏誤與操作量的比例關係……………………………. 29
圖2-4 比例控制中控制量的行為..….………….…..….……...…….…….. 30
圖2-5 以系統動力學表徵的積分控制結構 ….………………………… 31
圖2-6 積分控制與PI控制中控制量的變化行為.……..………..………... 31
圖2-7 以系統動力學表徵的微分控制結構……...….…………………….. 32
圖2-8 不同微分控制狀況的控制量變化..…………..….……………….… 33
圖3-1庫存調整系統…..….………..….….………………..……….…….… 37
圖3-2 庫存調整系統的庫存量變化…………………….….....……….…... 37
圖3-3 同步化流徑搭配下之庫存調整系統…….....…….…….…….….…. 38
圖3-4 同步化流徑搭配的庫存量變化……….……………...….……….… 38
圖3-5 具三階時間滯延的庫存調整系統……......…………...……....……. 42
圖3-6 具三階時間滯延的負回饋環行為………..…....……..…......……… 43
圖3-7 控制點的設定(一)…………………….…………………………….. 48
圖3-8 控制點的設定(二)………………….……….…………………….… 48
圖3-9 控制點的設定(三)….…………………….……………………….… 49
圖3-10 流徑間同步化搭配關係設計的進行步驟.………………………... 51
圖3-11 應用同步化流徑搭配方法的三階延遲庫存調整模式…………… 53
圖3-12 應用同步化流徑搭配方法之庫存量變化.………………………... 53
圖3-13 同步化設計之時間滯延處理機制……….………………………... 55
表3-1 時間滯延處理機制之計算程序.…………………………….……… 55
圖3-14 經處理時間滯延後之三階滯延庫存調整變化…………...………. 56
圖3-15 緩衝調整機制……….………...……….………....…………...…… 57
圖3-16 加上緩衝調整機制的庫存量變化……....……..………………….. 58
表4-1 Forrester之系統動力學經典模式…………………………………... 59
圖4-1 客戶、生產商、與雇員系統模式的模擬行為(一)…….………….. 62
圖4-2 客戶、生產商、與雇員系統模式的模擬行為(二)…….…….……. 62
圖4-3 客戶、生產商、與雇員系統模式中各廠商訂單間的關係……….. 63
圖4-4 客戶、生產商、與雇員系統模式中各廠商訂單間的關係……….. 64
圖4-5 送貨率與存貨流之間的關係………………………...…………..…. 66
圖4-6 生產製造與原料採購間關係……………………..…………….…... 67
圖4-7 存貨製造時間滯延的處理方式…………………….………..……... 68
圖4-8 原料採購時間滯延的處理方式…………………………..….…...… 69
圖4-9 存貨平衡水準調整的實作………………………….………..……... 70
圖4-10 原料平衡水準調整的實作………………………….……..………. 71
表4-2 二年性波動下的有效性衡量指標變化…………………………….. 75
圖4-11 下游顧客需求為二年週期變化之現金總量………...……..……... 77
圖4-12 下游顧客需求為二年週期變化之存貨數…………….…..………. 77
圖4-13 下游顧客需求為二年週期變化之投入生產人數…….…………... 78
圖4-14 下游顧客需求為二年週期變化之累積訂單數……….…..………. 79
表4-3 下游顧客需求呈現STEP變化時的主要變數穩定度衡量值……... 80
圖4-15 下游顧客需求呈現STEP變化時的現金總數……..……………... 80
圖4-16 下游顧客需求呈現STEP變化時的存貨數…………….………… 81
圖4-17 下游顧客需求呈現STEP變化時的投入生產人數………………. 81
圖4-18 下游顧客需求呈現STEP變化時的累積訂單數…………………. 82
表4-4 下游顧客需求呈現二年週期變化的主要變數穩定度衡量值…….. 83
圖4-19 下游顧客需求呈現週期性變化時的現金總量…………..……….. 83
圖4-20 下游顧客需求呈現週期性變化時的存貨數……………..….……. 84
圖4-21 下游顧客需求呈現週期性變化時的投入生產人數……...………. 84
表4-5 下游顧客需求呈現持續成長變化的主要變數穩定度衡量值…….. 85
圖4-22 下游顧客需求呈現週期性變化時的累積訂單量………...………. 85
圖4-23 下游顧客需求持續成長時的累積訂單量……………...…………. 86
圖4-24 下游顧客需求持續成長時的投入生產之人數………...…………. 86
圖4-25 下游顧客需求持續成長時的現金總量………………...…………. 87
圖4-26 下游顧客需求持續成長時的存貨數………………..…….………. 87
圖4-27 市場成長與投資不足模式之因果回饋圖………………………… 88
圖4-28 銷售員人數變化…………………………………………………… 92
圖4-29 產能變化…………………………………………………………… 93
圖4-30 累積訂單變化……………………………………………………… 93
圖4-31 市場察覺之交期變化……………………………………………… 94
圖4-32 產能利用率變化…………………………………………………… 95
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