1、 2009 年第六屆台灣作業研究學會理論與實務學術研討會以價值流圖與多準則決策方法進行需求不確定下之精實拉式系統設計The use of value stream mapping and multiple criteria decision-making method to implement lean pull system design under demand uncertainty1 楊大和 Ta- ho Yang國立成功大學 製造資訊與系統研究所e-mail: tyangmail.ncku.edu.tw 2 王正誼 Cheng-Yi Wang國立成功大學 製造資訊與系統研究所e-ma
2、il: p9696409mail.ncku.edu.tw3 盧俊臣 Jiunn-Chenn Lu國立成功大學 製造資訊與系統研究所e-mail: .tw4 沈育安 Yu-An Shen國立成功大學 製造資訊與系統研究所e-mail: P9894101mail.ncku.edu.tw摘要：本研究針對TFT-LCD廠後段製程，在需求不確定的情況下，提出結合精實拉式概念與價值流圖（Value Stream Map，VSM）之指導程序，此程序從定義產品價值開始，經由現況價值流圖的繪製找出浪費所在，以此為改善的契機並繪製未來理想狀態價值流圖作為改善方案的依據。本研究提出結合超級市場（Supermarke
3、t）與兩段CONWIP（Constant Work-in-process）之精實拉式生產策略，並藉由田口方法結合理想解類似度順序偏好法（Technique for Order Preference by Similarity to Ideal Solution，TOPSIS）的多準則決策方法求解最佳控制策略方案，用以改善製程中WIP過多導致的浪費，並且以生產週期時間（Cycle Time）與WIP來顯示出浪費的改善。關鍵詞：田口方法、拉式策略、理想解類似度順序偏好法、需求不確定、價值流圖Abstract: This paper proposes a lean pull strategy, co
4、mbining supermarket with constant work-in-process (CONWIP), which is applying value stream mapping methodology in a TFT-LCD manufacturing case study under demand uncertainty. The proposed multiple criteria decision-making (MCDM) method by using hybrid Taguchi and technique for order preference by si
5、milarity to ideal solution (TOPSIS) method to find the best scenario of production control policy to remove the waste of WIP and improve cycle time, simultaneously. Finally, a real-world TFT-LCD case study is used to demonstrate and test findings. After comparing current-state map and future-state map of the case study, the simulation results indicated that the average cycle time reduced from 8.80 days to 4.82 days as well as the WIP could be reduced from 50,342 panels to 25,795 panels without any loss of throughput.Keywords: Demand uncertainty, Lean production, Pull strategy, Taguchi, TOPSIS
