随机提前期下考虑动态紧急订货的库存模型

针对库存管理中面临的随机提前期和需求不确定的情况，探讨了企业利用紧急订货方法进行库存的决策管理.以经典(Q,R)模型为基础，利用常规订单执行过程中的实际信息建立库存模型.通过比较不同选择下的周期期望成本，给出了最优紧急订货点和订货量的计算公式.数值算例结果表明，该模型能够节省大量成本，并验证了最优解的合理性以及紧急订货成本的影响.

An Inventory Model with Dynamic Emergency Ordering under Stochastic Lead Time

Under the stochastic lead time and uncertain demand in the inventory system, an emergency ordering policy to optimize inventory replenishment was studied. Based on the classic (Q,R) policy, the inventory model with real time information in the process of regular ordering was set up. By comparing different cycle expected cost with different choices, this paper gave the expressions to calculate the optimal emergency ordering point and order amount. The numerical analysis shows that the model proposed can save much cost and it also proves the rationality of the optimal solution and the influence of the cost of emergency order.