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The mathematical science of facility siting has attracted much research in discrete and continuous optimization over nearly four decades. Investigators have focused on both algorithms and formulations in diverse settings in the private formulation has differences and similarities relative to the others, but the peculiarities of each problem provide the fuel(More)
CONTEXT Previous studies have reported that the number and distribution of trauma centers are uneven across states, suggesting large differences in access to trauma center care. OBJECTIVE To estimate the proportion of US residents having access to trauma centers within 45 and 60 minutes. DESIGN AND SETTING Cross-sectional study using data from 2(More)
Heuristic concentration (HC) is a two-stage metaheuristic that can be applied to a wide variety of combinatorial problems. It is particularly suited to location problems in which the number of facilities is given in advance. In such settings, the ®rst stage of HC repeatedly applies some random-start interchange (or other) heuristic to produce a number of(More)
The Trauma Resource Allocation Model for Ambulances and Hospitals (TRAMAH) was created to guide health planners in locating important and expensive resources. The model’s solution algorithm combines a mixed-integer linear program and a new ‘‘iterative switching’’ heuristic. The TRAMAH has the computational flexibility to optimally locate various numbers of(More)