关键词: 物流工程, 公平, 超立方模型, 排队选址问题, 城乡配送

Abstract:

To solve the location problem of urban- rural distribution centers under the random demand condition, queuing location models are built combined with queuing theory under a demand transfer rule. And the models focus on both equity goals and efficiency goals. The time satisfaction functions as the measure of service level reflects the differences between urban and rural demands. The system of customers and distribution centers is considered to be an M/M/p queuing system. The queuing discipline allows demands transfer when the distribution center is busy. The hypercube model is provided to calculate the probability of centers being available. The objective functions include equity objectives such as minimizing envy, minimizing Gini coefficient and maximizing lexicographical order, and efficiency objectives such as maximizing demands covered and satisfaction. The models are solved by a tabu search algorithm and tested on a real world data set from the distribution system. It is proved that the P- median model is efficiency optimization; the minimize envy model is equity optimization; the maximize lexicographical order model can achieve the equity-efficiency tradeoff.

Key words: logistics engineering, equality, hypercube model, queuing location problem, urban- rural distribution