A Combined Inventory and Delivery Model for Repairable Items
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Traditionally, logistics analysts have treated the delivery problem separate from the inventory and repair problems. In other words, each of these three problems--delivery, inventory, and repair--are treated individually. We combine the vehicle routing problems and inventory allocation problems in a single formulation. Furthermore, lateral re-supply is considered, in that supplies are not only available from the main depot, but also from other bases. After we get the lateral re-supply information, we set a delivery allocation plan out of the main depot. Such allocations are then delivered via ...
Traditionally, logistics analysts have treated the delivery problem separate from the inventory and repair problems. In other words, each of these three problems--delivery, inventory, and repair--are treated individually. We combine the vehicle routing problems and inventory allocation problems in a single formulation. Furthermore, lateral re-supply is considered, in that supplies are not only available from the main depot, but also from other bases. After we get the lateral re-supply information, we set a delivery allocation plan out of the main depot. Such allocations are then delivered via vehicles stationed at the main depot. There is a repair capability for each base other than the main depot as well. There is a newsboy inventory-cost function associated with each base to the every other base. We set up a model for repairable items only. Each base has two options: accept the repairable items, or deliver the repairable items, but not both. If the base chooses the "accept" option, we make sure that that base has used all its available resources, initial inventoried items and repair capabilities, before it receives re-supplies. In the transportation delivery submodel, we place limitation on the crew duty hours available.
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