ABSTRACT
Many widely used analytic inventory models include the assumption that item lead times are randomly and independently distributed about a stationary mean value. The models use a generalized form of Palm's Theorem to compute expected item back-orders as a measure of system performance. In actual practice, most large scale inventory systems do not conform to this assumption; demands which create backorders lead to expedited item delivery times. This research investigates the significance of the errors which are generated when the analytic model is used to represent such an inventory system. The methodology involved simulating the inventory system with Pritsker's Q-GERT.
- Brooks, R. B. S., Gillen, C. A., and Lu, J. Y., Alternative Measures of Supply Performance: Fills, Backorders. Operational Rate. and NORS, The Rand Corporation, RM-6094-PR, 1969.Google Scholar
- Crawford, G. B., Palm's Theorem for Nonstationary Processes. The Rand Corporation, R-2750-RC, 1981.Google Scholar
- Dunke, J. A. and Elmore, K. W., "An Empirical Investigation of the Effects of Inventory Stockage Models for Recoverable Items on Weapon System Availability," Unpublished Masters Thesis, LSSR 14--81, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio, June, 1981.Google Scholar
- Feeny, G. J. and Sherbrooke, C. C., "The (S, S-1) Inventory Policy Under Compound Poisson Demand," Management Science, 1966.Google Scholar
- Muckstadt, J. A., "A Model for a Multi-Item, Multi-Echelon, Multi-Indenture Inventory System," Management Science, 1973.Google Scholar
- Pritsker, A. A. B., Modeling and Analysis Using Q-GERT Networks, John Wiley & Sons, New York, 1979.Google Scholar
- Sherbrooke, C. C., "METRIC: A Multi-Echelon Technique for Recoverable Item Control," Operations Research, 1968.Google Scholar
- Simulating low demand asset availability in base supply with Q-GERT
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