Yedek parça envanter sistemlerinde konşimento kontratları

We study a Vendor Managed Inventory (VMI) partnership between a manufacturerand a retailer. More specifically, we consider a consignment contract, under whichthe manufacturer assumes the ownership of the inventory in retailer?s premises untilthe goods are sold, the retailer pays an annual fee to the manufacturer and themanufacturer pays the retailer backorder penalties. The main motivation of thisresearch is our experience with a capital equipment manufacturer that manages thespare parts (for its systems) inventory of its customers in their stock rooms. Weconsider three factors that may potentially improve the supply chain efficiency un-der such a partnership: i-) reduction in inventory ownership costs (per unit holdingcost) ii-) reduction in replenishment lead time and iii-) joint replenishment of multi-ple retailer installations. We consider two cases. In the first case, there are no setupcosts; the retailer (before the contract) and the manufacturer (after the contract)both manage the stock following an (S − 1, S) policy. In the second case, there aresetup costs; the retailer manages its inventories independently following an (r, Q)policy before the contract, and the manufacturer manages inventories of multipleretailer installations jointly following a (Q, S) policy. Through an extensive numer-ical study, we investigate the impact of the physical improvements above and thebackorder penalties charged by the retailer on the total cost and the efficiency ofthe supply chain.Keywords: Inventory Models, Vendor Managed Inventory, Joint ReplenishmentProblem, Supply Chain Contracts, Consignment Contracts.iii