Robust Wide Disaster Information and Sharing System over Japan Gigabit Network

Since various disasters provides serious damage influence at the time to many residents in wide area across Japan island, large scale of disaster information system with more robustness and redundancy covered over wide area is required. In this paper, we introduce a large scale distributed resident-oriented safety information system constructed over Japan Gigabit Network. The safety information with residents is registered to the local database in the evacuated area and integrated into an upper-layer database in the district area. Those local databases are mutually covered when the some of the databases are destroyed or disordered. On the other hand, the upper-layer databases are located to mutually different locations with long distance to isolate the influence to the same disaster and also mutually mirrored to support when the some of them are out of order. Thus, by introducing two levels of redundancy and backup functions, more large scale and robust safety information database system can be realized. In this paper, we designed and implemented a prototype system by our introduced method over Japan Gigabit Network to evaluate whether our suggested method is useful or not. Through the functional and performance evaluation, we could verified our suggested resident information system is effective and useful.