A Note on Stock Replenishment and Shipment Scheduling for Vendor-Managed Inventory Systems
针对Cetinkaya和Lee（2000）的供应商管理库存模型，提出精确优化方法，并指出原近似方法在某些情况下误差很大，同时给出改进的近似方法。
In a recent paper, Cetinkaya and Lee (2000) model integrated inventory control and shipment scheduling in connection with vendor-managed inventory (VMI). The model is optimized by an approximate technique. This note provides a simple procedure for exact optimization, and illustrates that the errors when using the suggested approximate technique may be very large for certain types of problems. We also suggest a new approximation and an adjustment that can be used to improve both the original and new heuristic.