title: Integrated locating of helicopter stations and helipads for wounded transfer under demand location uncertainty.
abstract: Health emergency medical service (HEMS) plays an important role in reducing injuries by providing advanced medical care in the shortest time and reducing the transfer time to advanced treatment centers. In the regions without ground relief coverage, it would be faster to transfer emergency patients to the hospital by a helicopter. In this paper, an integer nonlinear programming model is presented for the integrated locating of helicopter stations and helipads by considering uncertainty in demand points. We assume three transfer modes: (1) direct transfer by an ambulance, (2) transfer by an ambulance to a helicopter station and then to the hospital by a helicopter, (3) transfer by an ambulance to a predetermined point and then to the hospital by a helicopter. We also assume that demands occur in a square-shaped area, in which each side follows a uniform distribution. It is also assumed that demands in an area decrease errors in the distances between each two cities. The purpose of this model is to minimize the transfer time from demand points to the hospital by considering different modes. The proposed model is examined in terms of validity and applicability in Lorestan Province and a sensitivity analysis is also conducted on the total allocated budget.
authors.affiliation: School of Industrial Engineering, College of Engineering, University of Tehran, Tehran, Iran. Electronic address: alibozorgi@ut.ac.ir.
authors.forename: Ali
authors.initials: A
authors.lastname: Bozorgi-Amiri
authors.affiliation: School of Industrial Engineering, College of Engineering, University of Tehran, Tehran, Iran. Electronic address: sh.tavakoli@ut.ac.ir.
authors.forename: Shayan
authors.initials: S
authors.lastname: Tavakoli
authors.affiliation: School of Industrial Engineering, College of Engineering, University of Tehran, Tehran, Iran. Electronic address: hossein.mirzaei@ut.ac.ir.
authors.forename: Hossein
authors.initials: H
authors.lastname: Mirzaeipour
authors.affiliation: School of Industrial Engineering, College of Engineering, University of Tehran, Tehran, Iran. Electronic address: Mrabani@ut.ac.ir.
authors.forename: Masoud
authors.initials: M
authors.lastname: Rabbani
mesh_terms: D017732:Air Ambulances / Q000458:organization & administration / Q000600:supply & distribution*; D000401:Aircraft; D004632:Emergency Medical Services / Q000379:methods / Q000458:organization & administration / Q000600:supply & distribution; D006301:Health Services Needs and Demand; D006801:Humans; D007492:Iran; D017146:Models, Organizational; D008962:Models, Theoretical; D020380:Needs Assessment / Q000458:organization & administration; D019982:Organizational Case Studies; D013997:Time Factors; D014187:Transportation of Patients / Q000379:methods* / Q000458:organization & administration / Q000706:statistics & numerical data
keywords: Emergency medical service; Helicopter emergency medical service; Transfer point location problem; Uncertainty