This article addresses the problems, difficulties, pitfalls, and drawbacks in inventory management, from teaching and research in academia to applying, installing, and successfully using inventory systems in practice. Some guidelines and suggestions are offered to students, teachers, analysts, users and managers of inventory systems. Several of these guidelines are not uniquely associated with inventory management but apply equally well to the entire OR/MS area. This article is to some extent based on the discussions of a symposium with the same title that the authors organized and participated in during the 11th National Meeting of the American Institute for Decision Sciences, New Orleans, November 1979.
The paper describes the logic structure and techniques used in a Simscript program for simulating the movement of ships through a network of locks, reaches, lakes, and ports. The program also provides for endogenous route selection between "micro-route" alternatives, i.e., parallel locks or canals, and for the endogenous scheduling of ship movements, given port-toport commodity movement demand and fleet mix. The model is basically a general network simulation tool based on the concept of a "route map" which describes the sequence of facilities to be traversed between given points in the network. The cardinal mechanism in the model is a Movement Control Module Rea, John C., and Nowading, David C. Waterway Systems Simulation: Volume V--Simulation of Multiple Channel Deep Draft Navigation Systems.
The system provides support for the typical activities in the materials cycle: identifying materials needed for construction and maintenance projects, procurement and receipt of those materials, management of inventories at storerooms and plant sites, and materials-related accounting functions. It also provides for uniform numbering of TVA materials, and for the collection, computer storage, and use of consistent descriptive and technical information about those materials.The functions of the system depend heavily on daily computer processing and on on-line access to computer files. Several of the computer-stored files are used by multiple subsystems and by multiple TVA organizations. Sharing the data in this way was a major objective of the design and is one of the strengths of the system.
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