Manufacturing system includes multiple business organizations having different decision criteria such as factories, salespersons and customers. It is important to maximize the overall profit while considering the objectives of each organization by appropriate adjustment. In this study, we propose the order planning method using the credibility about salespersons. This proposed method adjusts the due date between the salesperson and the customer by considering the margin time, and then derives effective production schedule by solving the optimization problem that minimizes the weighted sum of the tardiness from due date and makespan. Several computational experiments are conducted so as to evaluate the effectiveness of the proposed method.
It is difficult to calculate the amount of inventory of intermediate products in a material processing factory which has complex multiple processes. If the amount is too great, inventory assets accumulate. On the other hand, if it is too small, tardiness in due-date is caused and the lead time from accepting order to shipping is extended because demand variation and equipment failure cannot be absorbed. In this report we explain a simulation model is explained and results are shown for comparing complementary amount of intermediate products by computing the flow from allocat-ing intermediate products to orders to shipping.
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