Kenneth Joseph, Peter M. Landwehr, & Kathleen M. Carley. (2014). An approach to selecting keywords to track on twitter during a disaster. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 672–676). University Park, PA: The Pennsylvania State University.
Abstract: Several studies on Twitter usage during disasters analyze tweets collected using ad-hoc keywords pre-defined by researchers. While recent efforts have worked to improve this methodology, open questions remain about which keywords can be used to uncover tweets contributing to situational awareness (SA) and the quality of tweets returned using different terms. Herein we consider a novel methodology for uncovering relevant keywords one can use to search for tweets containing situational awareness. We provide a description of the methodology and initial results which suggest our approach may lead to better keywords to use for keyword searching during disasters.
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Keri K. Stephens, & Jessica L. Ford. (2014). Banning mobile devices: Workplace policies that selectively exclude can shape crisis communication. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 279–283). University Park, PA: The Pennsylvania State University.
Abstract: There is a growing need to understand how mobile devices are used to reach people in a crisis. This study focuses on how work organizations play a gatekeeping role in how their employees receive crisis information. Relying on research in the digital divide and organizational justice, this study compares two different types of organizations and their policies banning or allowing mobile devices at work. Three major themes emerged: having omnipotent supervisors, being powerless workers, and experiencing information holes. These themes highlight the burden placed on organizations to create more inclusive digital policies to ensure that employees do not fall through the net of crisis management systems. Additionally, these findings necessitate new discussions among crisis and emergency management scholars that include the current understanding of the digital divide, specifically as it relates to digital inequality in the workplace.
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Keri K. Stephens, Jessica L. Ford, Ashley Barrett, & Michael J. Mahometa. (2014). Alert networks of ICTs and sources in campus emergencies. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 652–661). University Park, PA: The Pennsylvania State University.
Abstract: This study contributes an understanding of how ICTs and varying information sources work together during emergency alerts. It builds on the prior work on campus active shooter events by examining an organization that used a range of ICTs including mobile devices, social media, organizational tools, and news media, to notify their stakeholders about an emergency. The study design used a survey to capture the responses from a random sample of over 1000 stakeholders-students, faculty, and staff-who were notified of an active shooter emergency. The findings from the first three notifications suggest that messages reaching the most stakeholders were (a) sent by official sources through ICTs like mobile phones; (b) official email communication, and (c) messages that included face-to-face communication. While 11 different ICTs were included in the study, mass media (i.e., television and radio), and social media (Twitter and Facebook) did not function substantially in the emergency alert process.
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Kpotissan Adjetey-Bahun, Babiga Birregah, Eric Châtelet, Jean-Luc Planchet, & Edgar Laurens-Fonseca. (2014). A simulation-based approach to quantifying resilience indicators in a mass transportation system. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 75–79). University Park, PA: The Pennsylvania State University.
Abstract: A simulation-based model used to measure resilience indicators of the railway transportation system is presented. This model is tested through a perturbation scenario: the inoperability of a track which links two stations in the system. The performance of the system is modelled through two indicators: (a) the number of passengers that reach their destination and (b) the total delay of passengers after a serious perturbation. The number of passengers within a given station at a given time is considered as early warning in the model. Furthermore, a crisis management plan has been simulated for this perturbation scenario in order to help the system to recover quickly from this perturbation. This crisis management plan emphasizes the role and the importance of the proposed indicators when managing crises.
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Krispijn Scholte, & Leon J.M. Rothkrantz. (2014). Personal warning system for vessels under bad weather conditions. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 359–368). University Park, PA: The Pennsylvania State University.
Abstract: Many services provide weather forecasts, including severe weather alerts for the marine. It proves that many ships neglect the warnings because they expect to be able to handle the bad weather conditions. In order to identify possible unsafe situations the Coast Guard needs to observe marine vessel traffic 24 hours, 7 days a week. In this paper we propose a system that is able to support the Coast Guard. Ships can be localized and tracked individually using the Automatic Identification System (AIS). We present a system which is able to send a personal alert to ships expected to be in danger now or the near future. Ships will be monitored in the dangerous hours and routed to safe areas in the shortest time. The system is based on AIS data, probabilistic reasoning and expertise from the Coast Guard. A first prototype will be presented for open waters around the Netherlands.
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Leire Labaka, Josune Hernantes, Tina Comes, & Jose Mari Sarriegi. (2014). Defining policies to improve critical infrastructure resilience. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 429–438). University Park, PA: The Pennsylvania State University.
Abstract: Industrial accidents increasingly threaten society and economy; the increasing exposure and vulnerability of our modern interlaced societies contributes to intensifying their impact. Critical Infrastructures (CIs) have a prominent role, since they are vital for the welfare of the population and essential for the economic growth. As hazards are hard to predict, decision-makers need to implement adequate adaptation and mitigation strategies to improve CI resilience. Although CI resilience has attracted increasing attention, empirical studies are rare. Research on the implementation of policies aiming at identifying a clear sequence of measures to improve CI resilience is lacking. Therefore, we present a framework to identify resilience policies across four dimensions (technical, organizational, economic and social) and to define the temporal order in which the policies should be implemented. This research provides a framework grounded in our empirical work. Future work will aim at developing quantitative approaches to complement our results.
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Li Heng, & Chen Tao. (2014). Multiple attributes decision making method on social stability in nuclear accident scenario. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 409–413). University Park, PA: The Pennsylvania State University.
Abstract: The Chernobyl nuclear accident made Europe and even the whole world clearly aware of the threats posed by nuclear accidents. When the Fukushima nuclear accident happened in Japan, the “Rush for Salt Affair” took place in some Chinese cities. Meanwhile, large numbers of anti-nuclear parades were held in many Western countries, such as Germany and the United States. Nuclear accidents have a much more serious impact on society than does an ordinary disaster, due both to the nature and characteristics of nuclear accidents, as well as asymmetric in the general public's access to reliable information. By analyzing the mechanisms and characteristics of the impacts on social stability of a nuclear accident, this paper develops a multi-attributes decision making method based on index system of social stability factors in nuclear accident scenarios.
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Linda Katrine Andresen, & Erik G. Nilsson. (2014). Finding the best devices for emergency responders in Norway – an empirical study. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 110–119). University Park, PA: The Pennsylvania State University.
Abstract: In this paper we present the results from four empirical studies where we investigate the most appropriate devices for high-ranking emergency leaders – termed commanders in this paper – working close to the scene of incident, usually outside. The studies apply different methods including interviews, questionnaires and usability tests to investigate the technology used by commanders in the agencies today, their motivation for using new technology, as well as their needs for new devices. Three of the studies involve commanders from the police, the ambulance service and the fire and rescue agency in Norway. Devices with different screen sizes ranging from 4,3“ to 40” were used or discussed in the studies. The main conclusion from all the studies is a very clear preference for tablets. We did however identify difference between the agencies regarding the preferred size of an “ideal” tablet, as well as wishes for using more than one device.
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Lise Ann St. Denis, Leysia Palen, & Kenneth M. Anderson. (2014). Mastering social media: An analysis of Jefferson County's communications during the 2013 Colorado floods. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 737–746). University Park, PA: The Pennsylvania State University.
Abstract: We report on the social media communications and work practices of the Jefferson County Type III Incident Management Team during the September 2013 Colorado Floods. In this case study, we examine flood-related communications across three platforms: Facebook, Twitter, and the team's blog for insight into how this innovative team coordinated their communications to meet the information needs of a community outside of the media spotlight. Using a mixed method approach of interviews and social media content analysis, we describe their online behaviors in relation to the needs of the emergency response as a whole. We report on adaptations to their work practice that allowed them to extend traditional communications with social media to create an integrated communication plan. Finally, we look to the team's experiences for direction in how to use social media in emergencies generally.
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Loïc Bidoux, Jean-Paul Pignon, & Frédérick Bénaben. (2014). A model driven system to support optimal collaborative processes design in crisis management. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 245–249). University Park, PA: The Pennsylvania State University.
Abstract: This paper presents a system dedicated to support crises managers that is focused on the collaboration issues of the actors involved in the response. Based on context knowledge, decision makers' objectives and responders' capabilities, the system designs in a semi-automatic way a set of collaborative process alternatives that can optimize coordination activities during an ongoing crisis resolution. The technical design of the system mixes optimization algorithms with inference of logical rules on an ontology. Candidate processes are evaluated through multi-criteria decision analysis and proposed to the decision-makers with associated key performance indicators to help them with their choice. The overall approach is model driven through a crisis meta-model and an axiomatic theory of crisis management.
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Louise K. Comfort, Brian A. Chalfant, Jee Eun Song, Mengyao Chen, & Brian Colella. (2014). Managing information processes in disaster events: The impact of superstorm sandy on business organizations. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 230–239). University Park, PA: The Pennsylvania State University.
Abstract: Building community resilience to natural disasters represents a major policy priority for the United States as hazards impact vulnerable urban regions with increasing frequency and severity. Applying network analysis techniques, we examine the dynamics of emergency response to Superstorm Sandy, which struck the United States east coast in late October 2012 and caused over $72 billion in damages. Drawing on a variety of data sources and analytical techniques, we document the storm's impact on a system of interacting private, public, and nonprofit organizations. We find that the storm's response network exhibited clear patterns of information gaps and flows among different types of organizations. Our findings suggest a general lack of communication between government agencies and businesses, an area of potential improvement in future regional-scale emergency response systems.
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Ma Ma, H. Zhang, & Yi Liu. (2014). Development of a joint official microblog platform to improve interactive communication with the public under a centralized system. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 782–786). University Park, PA: The Pennsylvania State University.
Abstract: Social media bring both challenges and opportunities to crisis management. This paper summarizes the difficulties in crisis communication under a centralized jurisdiction system by looking into online collective behaviors in mainland China. The paper then introduces the development of an official microblog and proposes a joint official microblog platform to improve interactive communication in a centralized system. The functional design of this platform is introduced in detail and the future improvement of the platform is discussed.
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Magiswary Dorasamy, Murali Raman, & Maniam Kaliannan. (2014). Evaluating CEMAS in simulated environment to support disaster management challenges. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 444–453). University Park, PA: The Pennsylvania State University.
Abstract: Researchers and emergency management system designers constantly find ways to produce suitable systems that have best fit between technology, and tasks. However, there is significant gap in the literature on designing information system that places greater emphasis on situational qualities. We posit that situational qualities are as important as information system success qualities such as system quality, information/knowledge quality and service quality. This research work aimed to fill this theoretical gap in designing IS for disaster management and to contribute towards guiding design decisions for future emergency management information systems development. A prototype system called CEMAS was designed and developed to support current challenges in disaster management. The underlying guiding theory for CEMAS was situational qualities interweaved within information system success factors in the form of knowledge management system. This paper presents the evaluation results of CEMAS in a simulated environment for flood.
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Marco Romano, Teresa Onorati, Paloma Díaz, & Ignacio Aedo. (2014). Improving emergency response: Citizens performing actions. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 170–174). University Park, PA: The Pennsylvania State University.
Abstract: The role of common citizens within the emergency management (EM) process is crucial in order to support efficiently the operators' activities during the response phase. Moreover, their participation is strictly related to their profile and their experience in previous events. In a previous contribution we identified the different roles that the citizens can play for an effective cooperation with the EM workers. In this paper, we introduce an emergency tool based on a mobile application designed to support the activities of the citizens acting as Agent. The Agents have specific capabilities recognized by the EM Operation Center (OC) to execute actions under the remote supervision of the EM operators. The proposed tool allows the Agents to receive information from the OC and to visualize it through an advanced visualization modality. In particular, available information is previously collected by the center from the witnesses and the affected people that have alerted about it.
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Marian Zulean, & Gabriela Prelipcean. (2014). Emergency preparedness in the European union. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 513–517). University Park, PA: The Pennsylvania State University.
Abstract: European Union is an important global actor – in terms of economy, welfare and soft security – but its institutional development and ambitions has to consider both the issues of grand challenges, resilience, disaster management, in accordance with its citizens' will and skills. The Lisbon Treaty as well as the recent legislation on civil protection produced incremental change and improved the Emergency Management. However, there are not studies to check how the new institutions, the knowledge flows or decisions work. The final goal of this short paper is to structure an inquiring system and design a research project on assessing the civil protection policy in the EU through a Delphi study with experts and practitioners. While the first part frames the issues the second part will design the methodology and sampling strategy for a Delphi technique.
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Marie Bartels. (2014). Communicating probability: A challenge for decision support systems. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 260–264). University Park, PA: The Pennsylvania State University.
Abstract: This paper presents observations made in the course of two interorganizational crisis management exercises that were conducted in order to identify requirements for a decision support system for critical infrastructure operators. It brings into focus how different actors deal with the uncertainty of information that is relevant for other stakeholders and therefore is to be shared with them. It was analyzed how the participants articulated und comprehended assessments on how probable the reliability of a given data or prognosis was. The recipients of the information had to consider it when making decisions concerning their own network. Therefore they had to evaluate its reliability. Different strategies emerged.
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Marius J. Paulikas, Andrew Curtis, & Thomas Veldman. (2014). Spatial video street-scale damage assessment of the Washington, Illinois Tornado of 2013. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 329–333). University Park, PA: The Pennsylvania State University.
Abstract: This paper advances a growing body of mobile mapping work which captures building scale tornado damage in order to reveal vulnerabilities, or protections, within an otherwise apparently homogenous damage path. The hope is to find how micro geography, or built environment structure patterning might lead to policy advances with regards to rebuilding of critical infrastructure in tornado prone areas. This paper will use spatially encoded video to record damage patterns for the Washington, Illinois tornado of November 17, 2013. What makes this event notable is the location and time of year which can be considered outside the norm. Individual building damage data are coded using the Tornado Injury Scale (TIS) and then analyzed using two forms of local area spatial analysis – a Getis-Ord (Gi) z-score analysis to identify hotspots of damage, and a Local Moran's I to identify building outliers within hotspots.
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Matthias Max, Sigmund Kluckner, & Susann Jentzsch. (2014). Trainings for crisis information systems in civil protection: A German perspective. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 518–527). University Park, PA: The Pennsylvania State University.
Abstract: Much research and technical development has been conducted to make crisis management more efficient, especially regarding crisis information systems used to streamline operations of authorities during a crisis. Experts from the German Red Cross mention that there is a need for the development and improvement of specific training methods and structures for such new crisis information systems in command and control centers. They also say that computer simulations could be a practical possibility to train crisis management and response staff. To substantiate this information, interviews were conducted with key officials in the field of German civil protection: command and control center staff, command and control center software trainers and crisis information system managers. This paper presents a qualitative study in the field of training German response personnel in crisis management information systems. The results are presented in three sections: suitable training strategies and structures, challenges and best practices for the implementation of trainings and using simulation as a training method for crisis information systems. The results contain personal experiences, opinions and known best-practices of the interview partners.
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Michael R. Bartolacci, Christoph Aubrecht, & Dilek Ozceylan Aubrecht. (2014). A portable base station optimization model for wireless infrastructure deployment in disaster planning and management. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 50–54). University Park, PA: The Pennsylvania State University.
Abstract: Disaster response requires communications among all affected parties including emergency responders and the affected populace. Wireless telecommunications, if available through a fixed structure cellular mobile network, satellites, portable station mobile networks and ad hoc mobile networks, can provide this means for such communications. While the deployment of temporary mobile networks and other wireless equipment following disasters has been successfully accomplished by governmental agencies and mobile network providers following previous disasters, there appears to be little optimization effort involved with respect to maximizing key performance measures of the deployment or minimizing overall 'cost' (including time aspects) to deploy. This work-in-progress does not focus on the question of what entity will operate the portable base during a disaster, but on optimizing the placement of mobile base stations or similar network nodes for planning and real time management purposes. An optimization model is proposed for the staging and placement of portable base stations to support disaster relief efforts.
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Milica Stojmenovic, & Gitte Lindgaard. (2014). Probing PROBE: A field study of an advanced decision support prototype for managing chemical, biological, radiological, nuclear, and explosives (CBRNE) events. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 90–99). University Park, PA: The Pennsylvania State University.
Abstract: The purpose of this field study was investigate teamwork and communication among event management personnel, to assess the degree to which PROBE, the advanced prototype they were using to manage a CBRNE simulation, would adequately meet their needs. The study was a continuation of previous research conducted in the early phase of PROBE development. Two communication-related analyses were applied to identify instances of effective and of ineffective communication among the management team. These revealed that communication was mostly effective. However, the one serious communication breakdown that was observed could have had fatal consequences. It showed that great care must be taken to ensure the safety of first responders at all times when evaluating prototypes in the field. A list of questions was generated from the lessons learned to assist future researchers prepare for CBRNE field studies.
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Monika Büscher, Catherine Easton, Maike Kuhnert, Christian Wietfeld, Matts Ahlsén, Jens Pottebaum, et al. (2014). Cloud ethics for disaster response. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 284–288). University Park, PA: The Pennsylvania State University.
Abstract: In emergencies, exceptions to data protection raise concerns that data may become available to unexpected actors during and after a crisis, resulting in privacy intrusion and social sorting. Apart from ethical issues, there are legal issues, for example around data minimization and issues around social and cultural practices of sharing information. This paper explores key ethical, legal and social issues (ELSI) in utilizing cloud computing for disaster response and management and some examples of innovative design.
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Muhammad Imran, Carlos Castillo, Jesse Lucas, Patrick Meier, & Jakob Rogstadius. (2014). Coordinating human and machine intelligence to classify microblog communications in crises. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 712–721). University Park, PA: The Pennsylvania State University.
Abstract: An emerging paradigm for the processing of data streams involves human and machine computation working together, allowing human intelligence to process large-scale data. We apply this approach to the classification of crisis-related messages in microblog streams. We begin by describing the platform AIDR (Artificial Intelligence for Disaster Response), which collects human annotations over time to create and maintain automatic supervised classifiers for social media messages. Next, we study two significant challenges in its design: (1) identifying which elements must be labeled by humans, and (2) determining when to ask for such annotations to be done. The first challenge is selecting the items to be labeled by crowd sourcing workers to maximize the productivity of their work. The second challenge is to schedule the work in order to reliably maintain high classification accuracy over time. We provide and validate answers to these challenges by extensive experimentation on real world datasets.
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Murali Raman, Magiswary Dorasamy, Saravanan Muthaiyah, & Maniam Kaliannan. (2014). Web-based community disaster management and awareness system (CEMAS) in Malaysia. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 384–393). University Park, PA: The Pennsylvania State University.
Abstract: Emergency situations are unavoidable. This paper presents the functions inherent in a prototype system that was developed in Malaysia for emergency management. The prototype is potentially useful in Selangor, a state in Malaysia that is prone to natural disasters such as flash floods and landslides. The paper is presented as a report of our on-going project in Malaysia and the intended future work regarding web-based emergency management systems in Malaysia. This prototype development is funded by the Ministry of Education in Malaysia and supported by the National Security Council of Malaysia (Majilis Keselamatan Negara, MKN).
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Murray Turoff. (2014). Emergency management education and ISCRAM. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 533–537). University Park, PA: The Pennsylvania State University.
Abstract: This paper presents the author's viewpoints and insights into what should be a major activity for ISCRAM to insure a better future for Emergency Management in general. The overall recommendation is that ISCRAM as a professional society should be very actively involved in setting a standard for an Emergency Management degree program that provides a distinctive major in EMIS (Emergency Management Information Systems). The emphasis and conclusions in this paper are based largely upon the situation in the United States.
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Murray Turoff, Victor A. Bañuls, Linda Plotnick, & Starr Roxanne Hiltz. (2014). Development of a dynamic scenario model for the interaction of critical infrastructures. In and P.C. Shih. L. Plotnick M. S. P. S.R. Hiltz (Ed.), ISCRAM 2014 Conference Proceedings – 11th International Conference on Information Systems for Crisis Response and Management (pp. 414–423). University Park, PA: The Pennsylvania State University.
Abstract: This paper summarizes the development of a Cross Impact and Interpretive Structural Model of the interactions of 16 critical infrastructures during disasters. It is based on the estimates of seven professionals in Emergency Management areas and was conducted as an online survey and Delphi Process. We describe the process used and the current results, indicating some of the disagreements in the estimates. The initial results indicate some very interesting impacts of events on one another, resulting in the clustering of events into mini-scenarios.
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