关键词: 库存策略, 缺陷率, 零售商中断, 订货模型, 更新报酬, 建模, 仿真

Abstract: Under the assumption that the durations of the supply or disruption periods at the retailer were mutually independent exponential distributions, firstly the expected cycle time and cost of both the qualified items and the defective ones were determined due to each order containing a random fraction of defective items. Secondly the long-run average cost model was established based on renewal reward theorems, so that the optimal order quantity at the retailer and the optimal number of batches for processing defective items were obtained. Finally computational results showed that the disruption intensity had no influence on the optimal number of batches and had reverse effect with the defective rate on the optimal order quantity; the average cost for the optimal order quantity only considering the defective rate was greater than that for economic order quantity when the disruption intensity was much higher.

Key words: inventory policy, defective rate, retailer disruption, order model, renewal reward, modeling, simulation