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Materials, manufacturing and marketing departments are the three major operating subsystems of any organization whether it is a production house or a service center, i.e. neither the goods producing organization nor the service providing organizations works without inventory, they have to maintain some inventory for smooth running of their businesses.
In recent years, the study of deteriorating items has gained great importance. Research in this direction began with the work of Whitin (1957), who considered fashion goods deteriorating at the prescribed storage period. Ghare and Schrader (1963) were the first to use the concept of deterioration, they developed an inventory model with a constant rate of deterioration, followed by Covert and Philip (1973) who formulated a model with a variable rate of deterioration with two parameter Weibull distribution, which was further extended by Shah and Jaiswal(1977).
Dave and Patel (1981) studied an inventory model with deterministic but linearly changing demand rate and constant deterioration over a finite planning horizon. Hollier and Mak (1983) had developed two mathematical models for an inventory system in which the units are deteriorating at a constant rate and the demand rate which follows negative exponential decrease. Sachan (1984) extended Dave and Patel’s model to allow shortages. Datta and Pal(1988) developed an EOQ model by introducing a variable deterioration rate and power demand pattern. T.C.E. Chang (1989) had considered infinite-horizon inventory problem in which items are decaying at a constant rate and the demand rate follows an exponentially decreasing function.
Chung and Ting (1994) determined the replenishment schedules for deteriorating items with time proportional demand. Hariga and Benkherouf (1994) developed an inventory replenishment model for deteriorating items with exponentially varying demand. This work was extended by Hargia (1995) to allow shortages. Hariga(1995) developed models for deteriorating items with time dependent demand. Su Chao ton, Tong Lee-Ing and Liao Hung-Chiang (1996) also developed a model under inflation for stock dependent consumption rate and exponential decay. Chakrabarti and Chaudhuri (1997) studied an inventory model with linearly changing demand rate, constant deterioration rate and shortages in all cycles over a finite-planning horizon. A.K. Bhunia and M. Maiti (1998) had formulated and solved two models for deteriorating items with linearly time dependent demand where replenishment rate changes linearly with the change in demand and on-hand inventory amount.