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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)
In this article, we address the problem of allocating an additional cell tower (or a set of towers) to an existing cellular network, maximizing the call completion probability. Our approach is derived from the adaptive spatial sampling problem using kriging, capitalizing on spatial correlation between cell phone signal strength data points and accounting(More)
The location of base stations (BS) and the allocation of channels are of paramount importance for the performance of cellular radio networks. Also cellular service providers are now being driven by the goal to enhance performance, particularly as it relates to the receipt and transmission of emergency crash notification messages generated by automobile(More)
In this paper, a tour-based multi-objective logistics model for optimized scheduling of the delivery of critical items in a disaster relief operation is proposed. Our model considers multi-items, multi-vehicles, multi-periods, and a split delivery scenario in a disaster. Two heuristic approaches are introduced to solve the logistics problem. In the first(More)
Aeromedical and ground ambulance services often team up in responding to trauma crashes, especially when the emergency helicopter is unable to land at the crash scene. We propose location coverage models and a greedy heuristic for their solution to simultaneously locate ground and air ambulances, and landing zones (transfer points). We provide a coverage(More)
Humanitarian relief is a key operation after a disaster for people who are isolated in disaster-affected areas and cannot get basic supplies for daily living. Because the demand can be large and unexpected, an efficient humanitarian relief logistics planning becomes extremely important. In a recent paper, Lin et al. (2009) proposed a logistics model for(More)
Foraging, either solitarily or collectively, is a necessary behavior for survival that is demonstrated by many organisms. Foraging can be collectively optimized by utilizing communication between the organisms. Examples of such communication range from high level strategic foraging by animal groups to rudimentary signaling among unicellular organisms. Here(More)
OBJECTIVE To determine the predictive value of the mechanism-of-injury step of the American College of Surgeons Field Triage Decision Scheme for determining trauma center need. METHODS Emergency medical services (EMS) providers caring for injured adult patients transported to the regional trauma center in three midsized communities over two years were(More)