70,434 research outputs found
A taxonomy for emergency service station location problem
The emergency service station (ESS) location problem has been widely
studied in the literature since 1970s. There has been a growing interest in the subject especially after 1990s. Various models with different objective functions and constraints have been proposed in the academic literature and efficient solution techniques have been developed to provide good solutions in reasonable times. However, there is not any study that systematically classifies different problem types and methodologies to address them. This paper presents a taxonomic framework for the ESS location problem using an operations research perspective. In this framework, we basically
consider the type of the emergency, the objective function, constraints, model
assumptions, modeling, and solution techniques. We also analyze a variety of papers related to the literature in order to demonstrate the effectiveness of the taxonomy and to get insights for possible research directions
CMD: A Multi-Channel Coordination Scheme for Emergency Message Dissemination in IEEE 1609.4
In the IEEE 1609.4 legacy standard for multi-channel communications in
vehicular ad hoc networks(VANETs), the control channel (CCH) is dedicated to
broadcast safety messages while the service channels (SCH's) are dedicated to
transmit infotainment service content. However, the SCH can be used as an
alternative to transmit high priority safety messages in the event that they
are invoked during the service channel interval (SCHI). This implies that there
is a need to transmit safety messages across multiple available utilized
channels to ensure that all vehicles receive the safety message. Transmission
across multiple SCH's using the legacy IEEE 1609.4 requires multiple channel
switching and therefore introduces further end-to-end delays. Given that safety
messaging is a life critical application, it is important that optimal
end-to-end delay performance is derived in multi-channel VANET scenarios to
ensure reliable safety message dissemination. To tackle this challenge, three
primary contributions are in this article: first, a channel coordinator
selection approach based on the least average separation distance (LAD) to the
vehicles that expect to tune to other SCH's and operates during the control
channel interval (CCHI) is proposed. Second, a model to determine the optimal
time intervals in which CMD operates during the CCHI is proposed. Third, a
contention back-off mechanism for safety message transmission during the SCHI
is proposed. Computer simulations and mathematical analysis show that CMD
performs better than the legacy IEEE 1609.4 and a selected state-of-the-art
multi-channel message dissemination schemes in terms of end-to-end delay and
packet reception ratio.Comment: 15 pages, 10 figures, 7 table
Research Directions in Information Systems for Humanitarian Logistics
This article systematically reviews the literature on using IT (Information Technology) in humanitarian logistics focusing on disaster relief operations. We first discuss problems in humanitarian relief logistics. We then identify the stage and disaster type for each article as well as the article’s research methodology and research contribution. Finally, we identify potential future research directions
An Integer Programming Model for the Dynamic Location and Relocation of Emergency Vehicles: A Case Study
In this paper, we address the dynamic Emergency Medical Service (EMS)
systems. A dynamic location model is presented that tries to locate and
relocate the ambulances. The proposed model controls the movements and
locations of ambulances in order to provide a better coverage of the demand
points under different fluctuation patterns that may happen during a given
period of time. Some numerical experiments have been carried out by using some
real-world data sets that have been collected through the French EMS system.Comment: Proceedings of the 12th International Symposium on Operational
Research (SOR'2013), Slovenia, September 2013, pp. 343-350, (2013
Performance Measures to Assess Resiliency and Efficiency of Transit Systems
Transit agencies are interested in assessing the short-, mid-, and long-term performance of infrastructure with the objective of enhancing resiliency and efficiency. This report addresses three distinct aspects of New Jersey’s Transit System: 1) resiliency of bridge infrastructure, 2) resiliency of public transit systems, and 3) efficiency of transit systems with an emphasis on paratransit service.
This project proposed a conceptual framework to assess the performance and resiliency for bridge structures in a transit network before and after disasters utilizing structural health monitoring (SHM), finite element (FE) modeling and remote sensing using Interferometric Synthetic Aperture Radar (InSAR). The public transit systems in NY/NJ were analyzed based on their vulnerability, resiliency, and efficiency in recovery following a major natural disaster
Location models in the public sector
The past four decades have witnessed an explosive growth in the field of networkbased facility location modeling. This is not at all surprising since location policy is one of the most profitable areas of applied systems analysis in regional science and ample theoretical and applied challenges are offered. Location-allocation models seek the location of facilities and/or services (e.g., schools, hospitals, and warehouses) so as to optimize one or several objectives generally related to the efficiency of the system or to the allocation of resources. This paper concerns the location of facilities or services in discrete space or networks, that are related to the public sector, such as emergency services (ambulances, fire stations, and police units), school systems and postal facilities. The paper is structured as follows: first, we will focus on public facility location models that use some type of coverage criterion, with special emphasis in emergency services. The second section will examine models based on the P-Median problem and some of the issues faced by planners when implementing this formulation in real world locational decisions. Finally, the last section will examine new trends in public sector facility location modeling.Location analysis, public facilities, covering models
Ambulance service operational improvement
This document is the accepted manuscript version of a Published Work that appeared in final form in International Paramedic Practice copyright © MA Healthcare, after peer review and technical editing by the Publisher. To access the final edited version see http://www.internationaljpp.com/cgi-bin/go.pl/library/article.cgi?uid=100396;article=IPP_3_3_61_63Since the start of industrialisation in the beginning of the previous century, processes, and technology have evolved drastically. Technology that had been developed for a specific application was found to open new horizons in other domains. A good example is the use of sonar technology on military submarines which eventually found medical applications in medical imaging (Oakley, 1986). The paramedic profession is still considered to be a relatively young profession, and although the clinical scope of practice of ambulance staff has widened there have been few noticeable and significant changes in the way Ambulance Services operate as public service providers. There is, however, great variation in the way pre-hospital emergency care provision is delivered and organised from country to country due for example to historical, cultural, financial, and geographical factors. Other industries are significantly more driven by profit, hence efficiency and reliability are aspects that have a direct and measurable financial impact and it acts as a driver for further developments.Peer reviewedSubmitted Versio
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