The Retailer's Ordering Policy For Substitution With Lead Time Unreliable

On the bases of the coordination and cooperation of the supply chain management, this thesis researches the single-cycle, two-stage supply chain problems with two suppliers and one retailer. On the assumption that there are two suppliers, the one retailer orders the commodities from them separately, or orders the commodities which are substitutable from them together. In order to gain the maximum expect profit, the thesis optimizes the retailer's total expect profit model with the idea of the lead time is controlled and the characteristic of the commodities are substituted. And then analyses and compares the models with each other, the thesis gains some meaningful conclusions: When there are two suppliers who can supply the substitute commodities in the face of the one retailer, the retailer's the optimal order quantity and the optimal expect profit are existent and only when order from them together, further more, the optimal ordering policy when order the commodities from the two suppliers together can get more expect profit than order the commodities from the supplier which lead time reliable in some conditions.The thesis' research frame as following: In Chapter 1, on the basis of introducing the research background and meaning, the thesis summarizes the research status of supply chain management involved, and then points out the main research contents and methods. In Chapter 2, the retailer's optimal ordering policy from one supplier without substitution is researched. The two ordering models are given when the commodities from one supplier, whose lead time is reliable or unreliable, which compared with each other then. In Chapter 3, it researches the retailer's optimal ordering policy from two suppliers with substitution. Firstly, the ordering model for complete substitute commodities and the other model for one-way substitute commodities from two suppliers are given when one supplier lead time reliable and the other one unreliable. And then it analyzes each model and compares one another with the models from the Chapter 2. That's the emphasis content of the whole thesis. In Chapter 4, it simulates and analyzes the models from the Chapter 3 with MATLAB. With the help of the simulation soft, we may find out each parameter how to influence the retailer's ordering policy directly and draw the conclusions and some management enlightenments. In the end, it summarizes the conclusions of the whole thesis comprehensively, and indicates the further research in the future.