AN (S − 1, S) Inventory System with Fixed Shelf Life and Constant Lead Times
研究了一种(S-1, S)易逝品库存系统，其中每个物品有固定保质期，需求为泊松过程，提前期恒定。通过水平穿越理论求解了系统的平稳分布，并分析了多种模型变体。
We consider an (S − 1, S) type perishable inventory system in which the maximum shelf life of each item is fixed. An order for an item is placed at each demand time as well as at each time that the maximum shelf life of an item is reached. The order lead times are constant, and the demand process for items is Poisson. Although the resulting process is ostensibly nonregenerative, we adapt level-crossing theory for the case of an S-dimensional Markov process to obtain its stationary law. Within this framework a number of model variants are solved.