A Problem of the Use Rate and Inventory Management of Coking Coal

In an enterprise a large amount of coking coal is needed every year.Since the receipt rate of each month is not even,a certain inventory is necessary for regulation.The monthly inventory level fluctuates abruptly in a year,therefore the average inventory is high which is about 250 thousands tons.This leads to the overstock of agreat deal of coal and thereby a considerable amount of circulating fund lies idle.Inaddition,some storage cost is spent and inventory loss is caused.In this paper,inaccordance with specific conditions in production,we present a management programme of the coal.We treat the use rate and inventory management problem as an optimal control of a discrete system for the purpose to guarantee the service,reduce the stockIevel,save energy resources and improve the economic benefit.