Procurement Decision-Making Study Based On The Demand Of Manufactering Enterprises

Procurement is an important part of supply chain management, and it connects enterprise's suppliers on one side, connects the customers on the other side. As the link of external enterprise and outside, it takes value in our enterprises and then transfer value to our customers, which is produced by enterprises. However the percentage of the cost of purchasing takes the proportion of the sales profits, as well as percentage of the wait time for delivery takes the entire production cycle, would be almost close to 50%. As a result, strengthen the management of procurement has extremely important economic significance.Concerning the importance of procurement and those uncertainties, this thesis will do the following jobs:1. First, it presents background and significance of this thesis. It gives the Study of foreign and domestic literatures from four aspects: the stability of demand, time-varying demand, random demand and volume discounts to collect information. On this basis, it puts forward the issue to be examined, then gives out the main ideas and contents of this research.2. Second, it contrasts the traditional and supply chain mode of procurement, sums up the development direction and challenges of supply chain procurement; then it analysis the relationship between the production plans and procurement plans, presents the problems and solutions of them in the supply chain; it classifies the policy of material procurement by different considering perspectives, with pointing out the importance of procurement for inventory control and cost of business.3. Analysis of the calculation principle of MRP in materials demands, and it makes a brief introduction to seven lot rules of replacement. Then it focuses on economic order quantity, introduces four common demands-based replenishment strategies: classical EOQ model, the stock out allowed added for a longer time, no stock out allowed added for a longer time, the stock out allowed added a very short time. Through the expressions and the same set of data, it gives the analysis of the cost trend of the four assumptions.4. Studies under non-stability demand. First, studies on exponential time-varying demand from the two aspects: single-cycle time-varying demand, multi-cycle time-varying demand to research decision-making of procurement, then it calculated optimum value of the variable under given conditions. In random demand conditions, discrete random variables and continuous random variables would be carried out to modeling and solving, and then it reaches an analysis formula to determine the optimal lot of replenishment.5. Description about bulk discounts for encouraging manufacturers to ordering with high-volume bulk, introduction of two discounting methods: all units quantity discount and incremental quantity discount. According to the requirements, replenishment with integer lot in reality, it introduces an algorithm to determine whole batch.As the conclusion of this article, it points out the main contents of the thesis, and looks forward to further research prospects.