Large Scale Distributed Disaster Information System Based on Nation-Wide Highspeed Network

Abstract

In this paper, a robust and large scale residentoriented safety information system on the occurrence of the various disasters constructed over a nationwide high-speed network is introduced. The evacuated residents can register their safety information to the local safety information servers in the evacuation area whether they can safely evaluated or not using mobile PCs or terminals at the evacuation place or mobile terminals on the way of evacuation. All of the local information servers are connected each other by wireless network and the safety information can be sent an upperlayer database in the district area and finally integrated into a district safety information in that region. In our system some of the damaged local servers due to the disaster can be detected and recovered by the upperlayer database server. On the other hand, the upperlayer database servers are backed up by mirror servers located at mutually different locations with long distance to isolate the influence of the same disaster when the some of them were destroyed or disordered. Thus, by introducing two levels of redundancy and backup functions, more large scale and robust safety information database system can be realized.

Ballooned Wireless Mesh Network for Emergency Information System

“…The system configuration and its function are described. A prototype system is constructed to evaluate its function and performance through several disaster applications such as WIide area Disaster Information and Sharing System (WIDIS) [6][7], Voice over IP telephone (VoIP), and omni-directional image surveillance system [8]. Through the performance and functional evaluation, we could verify the usefulness of the suggested system.…”