Selecting T for a periodic review inventory model with staggered deliveries
โ Scribed by James Flynn
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 486 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0894-069X
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โฆ Synopsis
Consider a single-item, periodic review, infinite-horizon, undiscounted, inventory model with stochastic demands, proportional holding and shortage costs, and full backlogging. Orders can arrive in every period, and the cost of receiving them is negligible (as in a JIT setting). Every T periods, one audits the current stock level and decides on deliveries for the next T periods, thus incurring a fixed audit cost and-when one schedules deliveries-a fixed order cost. The problem is to find a review period T and an ordering policy that satisfy the average cost criterion. The current article extends an earlier treatment of this problem, which assumed that the fixed order cost is automatically incurred once every T periods. We characterize an optimal ordering policy when T is fixed, prove that an optimal review period T * * exists, and develop a global search algorithm for its computation. We also study the behavior of four approximations to T * * based on the assumption that the fixed order cost is incurred during every cycle. Analytic results from a companion article (where ยต/ฯ is large) and extensive computational experiments with normal and gamma demand test problems suggest these approximations and associated heuristic policies perform well when ยต/ฯ โฅ 2.
๐ SIMILAR VOLUMES
We describe a periodic review inventory system where emergency orders, which have a shorter supply lead time but are subject to higher ordering cost compared to regular orders, can be placed on a continuous basis. We consider the periodic review system in which the order cycles are relatively long s