Inventory Models with Fixed Costs, Forecast Updates, and Two Delivery Modes
研究了一个定期盘点库存系统，包含快速和慢速两种交付模式、固定订货成本以及定期需求预测更新，证明了最优策略是依赖于预测更新的(s, S)型策略，并分析了策略参数的单调性。
This paper is concerned with a periodic review inventory system with fast and slow delivery modes, fixed ordering cost, and regular demand forecast updates. At the beginning of each period, on-hand inventory and demand information are updated. At the same time, decisions on how much to order using fast and slow delivery modes are made. Fast and slow orders are delivered at the end of the current period and at the end of the next period, respectively. A forecast-update-dependent (s, S)-type policy is shown to be optimal. Also shown are some monotonicity properties of the policy parameters with respect to the costs and information updates.