Models and Algorithms of Hub & spoke Location for Emergency Service Facilities in Response to Serious Emergency Incident

This paper presents the setup of the single allocation set covering location-allocation model for Emergency Service Facilities under strong time constraints and also presents extension to SASCP model and the single allocation set covering location-allocation model with bypass constraints (gamma - SASCP) for Emergency Service Facilities under large-scale emergent requirements. Improved Genetic Algorithm is designed and the effectiveness of the algorithm is verified by the specific example. The impacts of change of parameters such as time discount rate, maximum time constraint and bypass ratio on model results are compared and analyzed.