Malzeme ihtiyaç planlaması sisteminde sipariş miktarının belirlenmesi üzerine bir uygulama

Bu çalışma, malzeme ihtiyaç planlaması (MİP) sistemlerinde uygun sipariş miktarının belirlenmesi üzerinedir.Genellikle MİP uygulamalarında, verilen siparişler net ihtiyaçlara eşit olarak alınmaktadır. Ancak bu tür uygulamalar her zaman iyi sonuç vermeyebilmektedir. Literatürde uygun sipariş miktarını belirlemeye yarayan birçok yöntem vardır. Bu yöntemlerden ekonomik sipariş miktarı (EOQ), peryodik sipariş miktarı (POQ) ve en az toplam maliyet (LTC) yöntemleri seçilerek Yiğit Akü A.Ş.'ne ait verilere uygulanmış, yöntemlerin performansları envanter ve sipariş maliyetleri açısından değerlendirilmiştir.

An application for defining lot size on the material requirements planning system

In this study, the lot sizing rules in material requirements planning (MRP) systems are considered and compared in terms of the inventory and set up costs. Most of the applications on MRP take the offset net requirements to constitute the planned order schedule. However, there are many situations where constraints on the order lot size make this an unsuitable procedure. In literature, there are several procedures to help determine the appropriate lot size. Among these procedures, the economic order quantity (EOQ), the periodic order quantity (POQ) and the least total cost ( LTC) are choosen and applied for determing the suitable lot sizes on Yiğit Batery Company's data.

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1.Browne, J., Harhen, J., Shıvnan, J., Production Management Systems, Addison-Wesley Publishing Company, (1988)
2.Buffa. E.S., Sarin, R.K., Modern Production Operations Management, John Willey Sons, (1989)
3.Narasimhan, S,L., Me Leavey, D.W., Billington, P.J., Production Planning and Inventory Control, Prentice-Hall Inc. New Jersey, (1995)
4.Orlicky, J., Material requirements planning, New York: Me Graw-Hill, (1975)
5.Russell, R.S., Taylor, B.W., Production and Operations Management, Prentice Hall,Inc.,1995.
6.Berry, W., Lot sizing techniques for requirments planning systems: a framework for analysis, Production and Inventory Management, 13,2, (1972)
7.Debodt, M., Van Wassenhove, L., Lot sizes and safety stocks in MRP, Production and Inventory Management, 24,1, (1983)
8.Haddock, J., and Hubicki, " Which lot-sizing techniques are used in material requirements planning?", Prodution and Inventory management, 30, 3, 53-56(1989)
9.Robert, L., Nydick, Jr., and Howard J. Weiss, " An evaluation of variable-demand lot-sizing techniques," Production and Inventory Management, 30,4, 41-48, (1989)
10.Stevenson, J.W., Production Operations Management, Irwin Inc. Boston, (1993)
11.Wemmerlov, U., Design factors in MRP systems: a limited survey, Production and Inventory Management, 20 ,4,15-34, (1979)
12.Benson, P., Hill, A. And Hoffman, T., " Manufacturing systems of the future: a Delphi study", Production and Inventory Management, 23,3, 87-106, (1982)
13.Silver, E., and Meal, H., A heuristic for selecting lot size quantities for the case of a deterministic time varying demand rate and discrete opportunities for replenishment, Production and Inventory Management, 14,2,(1973)