en تحقیق در عملیات Operations Research پژوهشي Research The number of natural disasters and people affected by them has been increasing in recent years. The field of optimization is a significant element of a relief operation and has been extensively studied so far, especially during the last two decades. The design of a relief logistic network as a strategic decision and the relief distribution as an operational decision are the most important activities for disaster operation management before and after a disaster occurs. In the proposed mathematical model, pre-disaster decisions are determined according to the post-disaster decisions in a multi-stage stochastic problem. Then a well-known approach called branch and fixed coordination are applied to optimize the proposed model. The computational results confirm that the proposed approach has proper performance for disaster management in a multi-stage stochastic problem. ,Multi-stage stochastic,Branch and Fixed,Exact solution,Relief operation,Disaster management. 243 257 http://ijiepr.iust.ac.ir/browse.php?a_code=A-10-1561-2&slc_lang=en&sid=1 Hasan Hosseini-Nasab hhn@yazd.ac.ir 180031947532846005859 180031947532846005859 Yes Professor of Industrial Engineering, Yazd University, Yazd, Iran, Hamid Hasanzadeh hasanzadeh.ie@gmail.com 180031947532846005860 180031947532846005860 No Department of Industrial Engineering, Yazd University, Yazd, Iran