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博碩士論文 etd-0122110-152641 詳細資訊
Title page for etd-0122110-152641
論文名稱
Title
化工業客製化產品最適原料存貨決策模式之研究-以EVA乳膠產品為例
Optimal Stock Management of Customized Products in Chemical Industry
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
83
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
2010-01-07
繳交日期
Date of Submission
2010-01-22
關鍵字
Keywords
EVA乳膠、再訂購點、安全存量
safety stock, ROP, EVA emulsion
統計
Statistics
本論文已被瀏覽 5749 次,被下載 2662
The thesis/dissertation has been browsed 5749 times, has been downloaded 2662 times.
中文摘要
EVA乳膠係醋酸乙烯與乙烯共聚合物,是一種強力水性接著劑,原廠乳液經過配方廠加工後,大量被應用於木材、家具及紡織等行業,做為各類塑膠膜與多孔性基材之接著劑。在應用上,由於下游產業所使用之材質與製程不同,配方廠需針對不同客戶提供客製化產品,因此多以原料形式保有EVA乳膠,並在接單後始生產客製化產品;同時,EVA乳膠原料的訂購受限於運輸及訂購條件,單位訂購量大並需事先決定配送時點,在EVA乳膠季節性需求明顯、價格隨原料大幅波動的情況下,原料訂購遂成為配方廠營運上的重要議題。
傳統多期存貨的經濟訂購量(EOQ)與再訂購點(ROP)模式多以永續期間為前提,探討最佳之訂購量與再訂購點,應用在EVA乳膠等原料訂購時有其侷限存在。因此本研究以多期存貨之再訂購點模式為基礎,探討有限期間、季節需求變動、給定訂購量、預先決定配送點的條件下,服務水準與配送點的選擇方式,並以個案公司2006~2008年原料需求量之歷史資料為基礎進行分析,探討服務水準及配送點決策對於安全存量、短缺機率及存貨成本之影響;同時,本研究也進一步建構在價格變動而配送量固定情況下的化工業液態原料存貨決策模式,並進行最佳配送點決策之推導。
本研究之主要結論如下:
1.有限期間下服務水準並不直接對短缺機率與存貨成本造成影響。
2.配送點組合直接影響短缺機率與存貨水準,因此是主要決策因素。
3.本研究之存貨模式可有效決定最佳的配送點組合,並求得最低總存貨成本。
Abstract
Ethylene-vinyl acetate emulsion is the copolymer of vinyl acetate and ethylene, which has been developed as a powerful adhesive base. It effectively bonds substrates such as wood, cotton cloth, hardboard and paperboard. After modifying by adhesives producers, EVA emulsion can bond a great variety of surfaces, particularly effective in bonding polyvinyl chloride films and narrow-pore materials. Adhesives producers provides customized products according to different end users’ needs and consequently have to keep raw materials in stock until orders are placed. The ordering of EVA emulsion is an important issue for adhesives producers because of the seasonal demand pattern and price fluctuation of raw materials. Furthermore, under certain transporting and order restrictions, the ordering quantity is fixed and delivery time has to be made in advance.
The multi-period inventory models, including EOQ and ROP, are not suitable for analyzing the ordering of EVA emulsion due to the presupposition of unlimited period. This research is based on the case study for NP chemical, using modified ROP model to explore how the selection of service level and delivery time can effect safety stock, probability of shortage, and inventory cost under the conditions of limited period, seasonal demand, given order quantity, and pre-selecting delivery points. The study also constructs a liquid raw material inventory model with fluctuating price and given order quantity in order to determine the optimal combination of delivery points.
The conclusion of this study are presented as follows:
1.Service level doesn’t directly effects the probability of shortage and inventory cost in limited period.
2.The combination of delivery points is the key decision factor because of its causal relationship with the probability of shortage and inventory cost.
3.The optimal combination which leads to the lowest inventory cost can be determined by using the inventory model introduced in this study.
目次 Table of Contents
第一章 緒論 1
第一節 研究背景與動機 1
第二節 研究目的 2
第三節 研究流程 3
第四節 研究範圍與限制 4
第二章 文獻探討 5
第一節 存貨管理 5
第二節 存貨系統 9
第三節 影響需求的因素 15
第三章 EVA客製化產品產銷型態 19
第一節 合成樹脂與接著劑產業概況 19
第二節 EVA客製化產品產業鏈 25
第三節 個案公司:NP Chemical 31
第四章 研究設計 35
第一節 研究架構 35
第二節 ROP模式於化工業之應用 37
第三節 化工業液態原料存貨決策模式推導 39
第五章 化工業液態原料存貨之案例實證分析 45
第一節 案例分析與參數設定 45
第二節 化工業液態原料存貨決策模式分析 47
第三節 原料價格變動對存貨決策之影響 67
第六章 結論與建議 70
第一節 結論 70
第二節 管理意涵 71
第三節 建議 72
參考文獻 73
參考文獻 References
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