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East Japan Great Earthquake on March 11 in 2011 caused severe damages over the wide area of Northern Japan. A massive 9.0 earthquake destroyed many buildings and information systems, and a devastating tsunami swept over cities and farmland in the northern part of the country and set off warnings as far away the west coast of the United States and South(More)
It is proved that wireless network is suitable for disaster information infrastructure because of its robustness, mobility and flexibility. However current conventional wireless networks have limit in communication distance because of low electro-magnetic power density, non-directional antenna. This is quite fatal as emergency network particularly in(More)
In this paper, we introduce cognitive wireless network for a disaster information system based on dynamic network reconfiguration method to improve the connectivity. Our network system is consisted of multiple mobile routers based on currently available wireless LANs including IEEE802.11b, g, j, n, IEEE802.16 (WiMAX), cellular networks. Using those(More)
In this paper, packet loss rate and frame rate control finction for multimedia communication systems under heterogeneous environment by the wired and the wireless networks is proposed. In our suggested system, as channel coding, FEC (Forward Error Correction) method with Reed-Solomon coding is introduced to reduce the packet error rate on the wireless(More)
If a large scale of disaster occurs such as the East Japan Great Earthquake, there would be some possibility of the informational isolation from others because of the disconnection of communication network or high congestion. In facts, the East Japan Great Earthquake isolated many Japanese coastal resident areas, and the lack of disaster information is(More)
2 Outline ●Background ●System requirement ● Wide area Disaster information Network ●Safety information system ●Prototyping and evaluation ●Result and concluding remarks 2 3 Background Occurrence of large scale of disasters, such as earth quick, volcanic eruption, seismic sea wave, in addition to annual disaster, such as typhoon, rain flooding and(More)
So far, we have developed effective wide area disaster information network (WDN) using Internet over the combination of both wired and wireless network. In this information network, two important functions including resident safety information system and bidirectional video communication system between evacuation places and disaster information center are(More)