Sabit raf ömürlü ve pozitif tedarik süreli ürünler için ortak fiyatlandirma ve tedarik politikası

Most of the existing inventory models in the literature are based on the assumptionthat the items have infinite shelf life and do not deteriorate no matterhow long they stay on the shelf. However this assumption may not be applicablein many situations since there are also many types of products with limitedshelf lives. In the inventory literature stored items with fixed finite lifetimes areusually referred to as perishable items. Examples of perishable products includefresh foods, medical products, whole-blood units, packaged chemical productsand photographic films.In this study, we consider the joint pricing and ordering policy, (Q, r, P1, P2),for an inventory model with perishable items, with constant shelf lives and positivelead times. The demand process is assumed to be Poisson. If there is asingle batch on hand, the items in a batch are sold at price P1. If there aretwo batches in stock, the items in the older batch are sold at price P2, whereP1 > P2. The younger batch is not sold until the older one is totally depleted.Although the shelf lives are constant, the sequence of remaining shelf lives ofthe items at the instances where stock level hits Q, is a random sequence. Thelimiting distribution of this sequence is obtained and the analytical derivations ofthe operating characteristics of the model is based on this limiting distribution.Numerical results are also presented.