Job Shop 환경에서의 주문 투입 방법 경제성 비교

Abstract

This paper develops a new method for flow time prediction in a job shop, and proposes a new order review/release(ORR) method based on the predicted flow time. A new method estimates flow time by using exponentially smoothed feedback of waiting time updated at each job completion. The proposed ORR method utilizes both due date and estimated flow time. A series of tests is conducted with computer simulation experiments to evaluate performance of proposed methods. The experimental results show that the proposed flow time prediction method is superior with respect to the mean absolute percent error measures. The experimental results also show that the proposed new ORR method based on the predicted flow time is more economical than commonly used immediate release method(IMR) with respect to earliness/tardiness cost structures.