Yoshitaka Shibata

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In this paper, a ballooned wireless mesh network is proposed to promptly insure communication means to grasp the information with disaster area, resident’s safety and relief goods on the occurrence of disaster. By combining multiple ballooned wireless network nodes, a large mesh network is organized in the sky on the disaster area and can cover(More)
Cognitive Wireless Network (CWN) is expected as one of the most efficient transmission methods to solve today’s wireless problems like the lack of wireless bands or the efficient usage of limited wireless resources. However, CWN have not established effective transmission methods considered with QoS or upper layers protocols yet. In this paper,(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)
In this paper, a self power supplied micro wireless ballooned network is proposed to promptly insure communication means to grasp the information with disaster area, resident's safety and relief goods on the occurrence of disaster. By combining multiple ballooned wireless network nodes with solar panel power supply, a large surveillance camera network 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)