The maximal covering location problem with capacities on total workload
Management Science
A reliability model applied to emergency service vehicle location
Operations Research
A simulation model of a helicopter ambulance service
WSC '05 Proceedings of the 37th conference on Winter simulation
Emergency medical systems analysis by simulation and optimization
Proceedings of the Winter Simulation Conference
Survey: A review on simulation models applied to emergency medical service operations
Computers and Industrial Engineering
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Timely transport of a patient to a capable medical facility is a key factor in providing quality care for trauma patients. This paper presents a mathematical model and a related solution method to search for optimal locations of trauma centers and air ambulances. The complicatedness of this problem stems from the characteristic that optimal locations for the two resources are coupled with each other. Specifically, this coupling makes it difficult to develop a priori estimates for the air ambulance's busy fraction, which are required to construct a probabilistic location model. We propose a method that uses integer programming and simulation to iteratively update busy fraction parameters in the model. Experimental results show that the proposed method is valid and improves the solution quality compared to alternative methods. We use real data on Korean trauma cases, and apply the method to the design of a trauma care system in Korea.