Study Inventory Control Models Of Deteriorating Goods

The fundamental purpose to study of inventory control methods is to reduce the waste of resources and use of limited resources in a reasonable way and reduce total cost of logistics,so that enterprises in the course of business can get more profits.At present,the loss of deteriorating goods is in a very large proportion of total sales in China.Therefore,the study of perishable inventory control theory and method of operation of the business has important practical significance.In recent decades,although the expansion research of the traditional inventory control theory has made great progress, there are a considerable gap between the results of theoretical studies shortcoming and the needs of the practical applications.In this paper,the existing inventory of deteriorating goods were further expanded research from the many aspects of the theory of these stocks because of the inventory control theory during the practical shortcomings in decision-making.Specific studies are as follows:1.Classical EOQ formula.At first,the classic EOQ formula is extended to a finite planning period with price-dependent and stock-dependent demand and the backlogging impact factor is a decreasing function of the actual waiting time.We release the replenishment interval is constant and present a inventory model to find the right order strategies and pricing strategies. A sensitivity analysis of the optimal solution with respect to parameters of the system is carried out. The evidence is provided for the enterprises.2.Substitution for inventory control model extended to the inventory control of deteriorating goods.There are a variety of deteriorating goods in the same market,where one may be to some extent substitutes for one another.At first,We present a inventory model for deteriorating goods under demand with substitution and the storage-time-dependent demand. The strategies of the best order quantity and the optimal price of the two perishabe goods with priced-driven substitutable demand under the cooperative and competitive situations are drived.The effects of system parameters on the optimal strategy and the optimal profit with substitutable demand are also discussed.3.The expansion of production inventory model studies as partial backlogging phenomenon. When a stock out situation occurs, only a fraction of demand occurring at a given time is backordered. The fraction, moreover, is a decreasing function of the waiting time.In this paper,we present the production-inventory model with time-dependent partial backlogging.The expansion of research was studied as follow:First,the factor of time-dependent partial backlogging introduced into the production-inventory model for finding the optimal production strategies.Second,the factor of stock-dependent demand introduced into the production inventory model for finding the optimal production strategies.Third,we think the real income of consumers will be changed if the product prices changes.So it will affect demand of the products.We present the production-inventory model with price-dependent and stock-dependent.Last, the ramp type demand rate is very commonly seen when some new brand of consumer goods comes to the market. In the case of ramp type demand rate, the demand increases linearly at the beginning and then the market grows into a stable stage such that the demand becomes a constant until the end of the inventory cycle.The production inventory strategy of the new brand of consumer goods we studied make up the inventory control deficiencies of the existing inventory model with deteriorating goods.4.Integrated Production-Inventory Model for Deteriorating Goods under a Multi-Echelon Supply Chain Environment.We have studied the supply chain coordination under a Two-Echelon Supply Chain Environment.In this paper,we develop a multi-lot-size production and inventory model of deteriorating goods with constant production and stock-dependent demand rate.This inventory system consisted of a manufacturer and multi-retailers.Single continuous production at a given production rate and multiple batch ordering were considered.Inventory models for the manufacturer and the retailers were developed when deteriorating rate were constant,and demand rate of customer depended on retailer's current inventory level.An algorithm to calculate the manufacturer's optimal production time and the ordering time was derived.The distribution of cooperation profits based on Shapely-value was put forward.Finally,a numerical example was given to illustrate the results of the model.Results showed that the revenue of integrated supply chain is higher than that of non-integrated supply chain.The distribution of cooperation profits is feasible and efficient.The study enriches the content of the theory of inventory and extends the scope of practical applications.The evidence shows that we provided a more adequate scientific theory for the enterprises to carry out the actual inventory decision-making.