Abstract: Emergency materials reserve is one of the effective means to deal with unexpected disasters. In order to satisfy the reserve principle of people-oriented, maintaining stability and overall coordination, this paper uses cloud service mode to redeploy materials uniformly under the shortage of reserves. According to population coverage rate and expected materials demand of each reserve point in the emergency system, an emergency material reserve model considering expected redeployment based on cloud services is built with the goal of the fair utility of material reserve and the expected redeployment cost. Non-dominated Sorting Genetic Algorithm with elitist strategy (NSGA-II) is designed to solve the model. Based on the research results of regional division of emergency materials reserve in China, the proposed model is used to optimize the deployment of emergency materials in the divided regions. Through the analysis of the statistical data of natural disasters in China from 2000 to 2011, the probability of disasters occurrence in different regions and the occurrence probability of different disaster degrees during the planning period are estimated. The developed NSGA-II is programmed by using MATLAB 2011b software to obtain the material allocation quantity of each reserve point under different preferences. Furthermore, a sensitivity analysis is made for the total amount of materials reserves. The results show that the expected redeployment cost is reducing with the increase of the total reserves. When the increase of the purchase cost is less than the reduction of expected redeployment cost, the total expenditure will decrease with the increase of total reserves. The optimal value of total reserves is obtained until the reduction of total expenditure reaches the maximum. The purchase cost and unit weight of materials are the decisive factors of the impact of the total reserves on the total expenditure and the expected redeployment cost. For the unit material with larger weight and smaller purchase cost, the total reserves should be more; on the contrary, the total reserves should be less. Therefore, this research is helpful for emergency command system to realize the unified allocation and sharing of materials, to avoid duplicate investment and to save money.

Key words: safety management, reserve principle of emergency materials, fair utility, excepted demand, NSGA-II