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Research paper : Information sharing platform to assist rescue activities in huge disasters (I. Noda)−120−Synthesiology - English edition Vol.5 No.2 (2012) cathedral.html), Eric S. Raymond introduces the words of a famous hacker:“Smart data structures and dumb code works a lot better than the other way around.” (Fred Brooks: The Mythical Man-Month, Chapter 11)“Show me your flowchart and conceal your tables, and I shall continue to be mystified. Show me your tables, and I won't usually need your flowchart; it'll be obvious.”(Fred Brooks: The Mythical Man-Month, Chapter 9)In the open source system development done by numerous people under a relatively loose policy, it is important to reuse the modules created by other people. The above words show that the hand-over of reusable knowledge goes smoothly for data structures that handle modules rather than the functions of the modules. Similarly, many people and organizations will be involved in the design and development of partial modules in the disaster information system. The development span is long, and the transfer of the design philosophy and knowledge of the architecture are important. In that sense, the concept of data-centered module linkages is appropriate as the development method of the disaster information system.4 Demonstration systemsThe mitigation information sharing platform proposed in this paper was developed in the following projects: Special Project for Earthquake Disaster Mitigation in Urban Areas, Special Coordination Funds for Promoting Science and Technology, Science and Technology Project for a Safe and Secure Society, and Special Project for Earthquake Disaster Mitigation in Tokyo Metropolitan Area of the Ministry of Education, Culture, Sports, Science and Technology (MEXT); and Strategic Advanced Robotic Elements Engineering Development Project of the Ministry of Economy, Trade and Industry (METI). Several linkage systems were built through these projects, and demonstration experiments were done. In this chapter, the outline of the demonstration experiments in Mitsuke City and Toyohashi City will be described.4.1 Demonstration experiment in Mitsuke CityWhen a disaster hits, the sharing of information reported among various sites and different sections is important. As an attempt in multiple linkages of various disaster information systems based on the proposed architecture, we conducted a demonstration experiment of using the DaRuMa mediation to integrate the various information systems of various institutions that were involved in the disaster prevention and mitigation during flooding, at Mitsuke City Hall, Niigata Prefecture, on October 27, 2006 (Fig. 7). In this experiment, the information from several divisions of the city hall, police and fire departments, and companies of lifelines such as for electricity and gas were integrated by DaRuMa mediation, and attempts were made to share the information among the divisions. At the same time, reports from disaster volunteers using portable terminals and automatic transmissions from water level sensors were integrated. We built an integrated system where the disaster response personnel would not be drowned in the organization of information and therefore could concentrate on disaster response activities.[13]Niigata Prefecture information sharing systemTohoku Electric information sharing systemNTT East Japan information sharing system(demonstration experiment by the Ministry of Internal Affairs and Communications)NIEDNational Research Institute for Earth Science and Disaster Prevention (NIED)Sensors (weather, river, dam)Information release to mass mediaKogakuin UniversityEvacuation guidance simulationTraffic simulationAISTAnzen-Anshin-MaipuranInformation DB for mass mediaFire and Disaster Management AgencyCabinet Office University of TokyoUniversity of TokyoInformation input, displayAIST,NIEDNIEDAIST, NIEDNiigata Prefecture information sharing DBMitsuke City information sharing DBRefugeDisplay systemNIEDDisaster response and management system Fire and Disaster Management AgencyInformation collection, terminalPower outageinformationTraffic blockade informationRefuge informationPhone line down informationWarning water-level informationCabinet-ministry-agency disaster information sharing platformFig. 7 Overall diagram of the Mitsuke City demonstration experiment

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