運用TOC 動態緩衝管理改善封測製造廠存貨績效之實證研究

Improving the Performance of Inventory Management by TOC Dynamic Buffer Management– A Case Study on an Assembly House in Taiwan

徐嘉徽(Chia-Hui Hsu)

指導教授 ： 張永佳 ； 陳勝一

國立交通大學/管理學院/管理學院工業工程與管理學程/碩士(2018年)

摘要

目前中下游的封裝模組業者中多以取得晶圓IC與零件後組裝加工，貼上客戶的商標後送返客戶銷售。此產業的競爭關鍵在於營運週轉快速。維持低成本優勢、最大效率產出，並與上游供應商、經銷商維持策略合作關係。因市塲需求快速變化，原物料庫存多的代工廠即面臨高存貨損失。可以說除了決策與執行力、財務運作、價格判斷，維持最低的庫存量，但又同時滿足客戶需求比技術門檻更重要。本研究運用限制理論中的聚集點概念降低需求變異的波動，以具代表性的共用料作為研究對象進行模擬驗證，比較現行方法以客戶提供的需求預測加上安全庫存與TOC 以過去日用量動態緩衝管理補貨，提出可靠的備料模型應用於封裝模組廠，確認TOC動態緩衝管理作為原材料供應的管理工具，以制約點簡單卻顯著改善整體倉庫物料的投資，另外因為新產品導入仍屬實驗階段，本研究不否定以預估方式執行NPI備料計畫。

關鍵字

存貨管理 ； 限制理論 ； 動態緩衝管理

並列摘要

Most of the modern assembly factories acquire wafer ICs and parts, and then assemble and send back to customers after affixing product trademarks. The key advantages in a packaging company are the rapid turnover of operations, low cost, efficiency, and maintaining a strategic partnership with upstream suppliers and distributors. The electronics manufacturing services (EMS) is facing high inventory losses due to lumpy demand. In addition to decision-making and execution, financial operations, and price judgments, it is more important to minimize inventory level to meet customer needs at the right time rather than techniques. This study is applying aggregation of TOC to reduce the cumulative representation of uncertainty. The analysis is conducted by considering the common components. The current practice is a forecast-based and relying on safety stock which ensures a given level of service, dynamic buffer management tool dynamically adjusts the size of each material buffer and provides replenishment priorities by monitoring the status of the buffer. We propose a reliable inventory model applied to IC assembly industry. The model has been confirmed that uses the dynamic buffer management as a management tool for raw material can significantly improve the efficiency in warehouses. This study does not negate the demand forecasting for NPI stage as the introduction of new products is still in the experimental stage.

並列關鍵字

Inventory management ； theory of constraint ； dynamic buffer management

參考文獻

1. 公開資訊觀測站,http://mops.twse.com.tw/mops/web/t56sb01n_1.(last visited Apr. 30,2018).

2. 李榮貴,TOC制約管理方法,eWant育網 ,http://www.ewant.org.(last visited Sep. 15,2016).

3. 吳碧娥,北美智權報193期,北美智權報 ,http://www.naipo.com/Portals.(last visited Nov. 5,2017)

4. 資策會MIC,https://mic.iii.org.tw.(last visited Oct. 20,2017).

5. Blackburn, J. D., Kropp, D. H. and Millen, R. A.(1985). MRP system nervousness: Causes and cures. Engineering and Process Economics,9(1-3), 141-146.