bi-objective model for ambulance routing for disaster response by considering priority of patients

Disaster situation could suddenly apply large number of injured people and disarrange the emergency medical service simultaneously (ems). using all facilities, ambulance, rescue helicopter and medical drone as integrated part and making decision for assigning to patient’s efficiency are concerns of ems. therefore, in this study we introduce a new bi-objective model for ems in order to reduce the rate of mobility and mortality with aim of reducing latest service completion time and total cost of system simultaneously. by recognition level of injury, we consider two types of patients: i. red code patients who have been injured seriously and have to be taken to a hospital. and ii. green code patients who are injured slightly and are treated at the same place. since making decision and responding to disaster situation should be with high quality within seconds, for this purpose after validating and solving that by augmented ε-constraint method by gams, we applied two nsga-ii and customized bees algorithm for multi objective solution that called multi objective bees algorithm (moba) in dynamics and uncertain situation for coping high frequency within very short response time and near the optimum solution result. the quality of the result is considered for choosing the metaheuristic solution. at the end, sensitive analysis is implemented on the model and the effect of reducing and increasing some of parameters on the model is investigated.