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This paper offers a descriptive account of Twitter (a micro-blogging service) across four high profile, mass convergence events—two emergency and two national security. We statistically examine how Twitter is being used surrounding these events, and compare and contrast how that behavior is different from more general Twitter use. Our findings suggest that(More)
This paper presents descriptive accounts of time-critical organizing in the domain of emergency response. Patterns of mobile phone interaction in such work is analyzed showing how the dyadic exchange of mobile phone numbers between the actors plays an important role in the social interactions in the organizing and sensemaking of the emergency. Enacted(More)
This article presents a social approach for disaster management, based on a social portal, so-called Disasters2.0, which provides facilities for integrating and sharing user generated information about disasters. The architecture of Disasters2.0 is designed following REST principles and integrates external mashups, such as Google Maps. This architecture has(More)
Effective handling of location-based data is important to emergency response management (ERM). Expert team members co-located around maps typically discuss events while drawing freeform areas or while using physical placeholders representing incidents. Key ERM functions are filtering data, selecting information recipients, searching datasets, drawing(More)
This paper reports on an explorative project aimed to study the use of live video technology in emergency response work. The initial stage of the project aimed at enabling an emergency response organization with live video capabilities. The study covered the steps of design, development and deployment of an application for live video broadcasting. Over a 10(More)
This paper presents descriptive accounts from an ethnographic study of time-critical work in the domain of emergency response and the operative work of fire crews. The verbal communication as part of such work creates difficulties in providing accountability of the fire crew's actions. The concept of work rhythms and temporal structures is used as an(More)
This paper presents findings from a design-oriented study focusing on emergency response work. Traditionally, information technology for emergency response work has included enroute navigation advice, resource management, hazard material databases, property information repositories, and situation reporting using sketching functionality. Now, a new class of(More)
This paper presents a crisis response simulation model architecture combining a discrete-event simulation (DES) environment for a crisis scenario with an agent-based model of the response organization. In multi-agent systems (MAS) as a computational organization, agents are modeled and implemented separately from the environmental model. We follow this(More)