Yoshitaka Shibata

Iwate Prefectural University, Japan

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Publications (139)10.68 Total impact

  • Goshi Sato, Noriki Uchida, Yoshitaka Shibata
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    ABSTRACT: In order to temporally recover the information network infrastructure in disaster areas from the Great East Japan Earthquake in 2011, various wireless network technologies such as satellite IP network, 3G, and Wi-Fi were effectively used. However, since those wireless networks are individually introduced and installed but not totally integrated, some of networks were congested due to the sudden network traffic generation and unbalanced traffic distribution, and eventually the total network could not effectively function. In this paper, we propose a disaster resilient network which integrates various wireless networks into a cognitive wireless network that users can use as an access network to the Internet at the serious disaster occurrence. We designed and developed the disaster resilient network based on software defined network (SDN) technology to automatically select the best network link and route among the possible access networks to the Internet by periodically monitoring their network states and evaluate those using extended AHP method. In order to verify the usefulness of our proposed system, a prototype system is constructed and its performance is evaluated.
    Mobile Information Systems 01/2015; 2015:1-11. DOI:10.1155/2015/308194 · 1.79 Impact Factor
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    ABSTRACT: In case of local areas, there are possibilities to isolate from other areas after earthquakes. Besides, the network diversity between urban and local area might cause the future problems of health or public services by information networks. The DTN (Delay Tolerant Networks) is considered to be one of the effective methods, and there are previous researches to improve the DTN routings. However, the current rapid developments of mobile devices such as data storages or broadband wireless networks have made the efficiency different as the previous researches. Therefore, we propose the Enhanced Media Coordinate System for DTN to the architecture in order to provide the Data Triage, Node Selection based on its Territory, and Dynamic FEC (Forward Error Correction). In this paper, the proposed Dynamic FEC with population estimation is especially explained, and the results of the computational simulation by the GIS map of a Japanese coastal town are reported. Then, the results are discussed for the future studies of DTN for Disaster Information Network System in local areas.
    2014 28th International Conference on Advanced Information Networking and Applications Workshops (WAINA); 05/2014
  • Kenta Ito, Go Hirakawa, Yoshitaka Shibata
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    ABSTRACT: Japan is prone to natural disasters occurring including earthquakes, tsunami, typhoon, heavy rain and snow. A wide range and quick information gathering systems are needed after a disaster has occurred. In addition, wireless networks are very useful at a disaster has occurred. By using wireless networks, we can build a network quickly using moving vehicles. But there is a challenging communication environment in hilly and mountainous areas and after a disaster has occurred where communication is completely disabled. In this paper, we introduce SODiCS (Spatial and Temporal Omni directional Video Distribution and Collection System) for challenged communication environment. Data gathered using Omni directional camera and sensor is transmitted to all of the users through a web application. The user can see the data gathered on GIS map as a web service. We equipped the system with two modes of video distribution functions, Live View mode and Storage View mode. The system configuration and architecture are explained and a prototype system is constructed to evaluate the performance of our system.
    2014 28th International Conference on Advanced Information Networking and Applications Workshops (WAINA); 05/2014
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    ABSTRACT: In this research, we build the system which can gather safety information to the disaster countermeasures headquarters by adjusting refugees information quickly in the evacuation centers at the time of wide-scale disaster. In this system, use of the personal number card issued by social security number program is assumed. Using this personal number card, the refugees information is registered into the Refugees Personal Information DB Server. The registered refugees information is gathered by the disaster countermeasures headquarters, and evacuation center information is publicized from each local government. By practical use of this research, at the time of wide-scale disaster like the Great East Japan Earthquake, this system realizes quick gathering of refugees information. Relief supplies can be correctly rationed to each evacuation center by the disaster countermeasures headquarters grasps refugees detailed information.
    2014 28th International Conference on Advanced Information Networking and Applications Workshops (WAINA); 05/2014
  • Goshi Sato, Noriki Uchida, Yoshitaka Shibata
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    ABSTRACT: In order to temporally recover the information network infrastructure in disaster areas on the East Japan Great Earthquake on March 11, 2011, various wireless network technologies such as satellite IP network, 3G, Wi-Fi were effectively used. However, since those wireless networks are individually introduced and installed, but not totally integrated, some of networks were congested due to the sudden network traffic generation and unbalanced traffic distribution, eventually the total network could not effectively function. In this paper, by integrating those wireless networks into a cognitive wireless network, user can use this cognitive network as an access network to Internet by selecting the best network even though the serious disaster occurred. We introduce an OpenFlow based access network to automatically select the best network link and route among the possible access networks to Internet by periodically monitoring their network states and evaluate the those using extended AHP method. In order to verify the usefulness of our proposed system, a prototype system is constructed and its performance is evaluated.
    2014 28th International Conference on Advanced Information Networking and Applications Workshops (WAINA); 05/2014
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    ABSTRACT: There were serious damages in the northern part of Japan by the East Japan Great Earthquake on March 11, 2011. In order to quickly find and rescue the missing people and understand the disaster state in the damaged areas, it is required to widely monitor and quickly collect the information and images with disaster areas just after disaster. However, because of luck of power supply and communication network failure, it is very difficult to monitor the disaster area and transmit the image information to the headquarters. In this paper, we introduce a wireless ballooned monitoring system which is organized by high resolution omni-directional camera and wireless LAN to take images from the sky and sends them to the relay station on the ground. Thus, the images of wide areas in the disaster place ware monitored to quickly make decision for rescue on the disaster headquarter.
    2014 28th International Conference on Advanced Information Networking and Applications Workshops (WAINA); 05/2014
  • Go Hirakawa, Phyu Phyu Kywe, Kenta Ito, Yoshitaka Shibata
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    ABSTRACT: In this paper, we introduce a disaster area information gathering and distribution system SODiCS, which is expected to be an effective disaster prevention system in disaster-prone Japan. Moreover, we introduce automotive sensor data platform COMOSE, which can easily handle multiple sensor nodes. Subsequently, we declare functional requirements of SODiCS system and show that it is possible to implement SODiCS system of over COMOSE platform.
    2014 28th International Conference on Advanced Information Networking and Applications Workshops (WAINA); 05/2014
  • Yoshitaka Shibata, Noriki Uchida, Norio Shiratori
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    ABSTRACT: Recently serious natural disasters such as earthquakes, tsunamis, typhoons, and hurricanes have occurred at many places around the world. The East Japan Great Earthquake on March 11, 2011 had more than 19,000 victims and destroyed a huge number of houses, buildings, loads, and seaports over the wide area of Northern Japan. Information networks and systems and electric power lines were also severely damaged by the great tsunami. Functions such as the highly developed information society, and residents?? safety and trust were completely lost. Thus, through the lessons from this great earthquake, a more robust and resilient information network has become one of the significant subjects. In this article, our information network recovery activity in the aftermath of the East Japan Great Earthquake is described. Then the problems of current information network systems are analyzed to improve our disaster information network and system through our network recovery activity. Finally we suggest the systems and functions required for future large-scale disasters.
    IEEE Communications Magazine 03/2014; 52(3):44-50. DOI:10.1109/MCOM.2014.6766083 · 4.46 Impact Factor
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    ABSTRACT: Although two years have already passed after the East Japan Great Earthquake in 2011, outstanding topics such as having a resilient network for disasters still remain. The rural areas are considered more likely isolated from others because of limited transportation and network resources compared with the urban areas. In this paper, we introduce the resilient network with cognitive wireless network (CWN) based on delay tolerant networking (DTN) for disaster information system (DIS) in rural areas. In the system, a proper wireless link for each mobile is selected by comparing network parameters such as throughput, jitter, and latency, and transmits data sent by the DTN routing protocol including the Epidemic, Spray and Wait, MaxProp, and PROPHET. The simulation is held according to the GIS map, and the results are ready for discussion for future studies of DTN usages for DIS in rural areas.
    International Journal of Adaptive and Innovative Systems 01/2014; 2(1):29 - 42. DOI:10.1504/IJAIS.2014.061044
  • Mobile Information Systems 01/2014; 10(4):347-359. DOI:10.1155/2014/495750 · 1.79 Impact Factor
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    ABSTRACT: In this paper, we introduce Software Defined Network framework 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, satellite IP network and green energy. Those wireless networks are interconnected by OpenFlow Switch and their links and routes are managed by OpenFlow Controller. The proper communication links and routes can be selected based on the required network characteristic, such as electro-magnetic field strength, throughput, latency, packet loss rate and communication distance. User can continue to transmit/receive the disaster information in disaster area even though a part of the network infrastructure is damaged due to the disaster using OpenFlow framework as software defined architecture and green based energy. In this paper, we designed and implemented a disaster information wireless network with currently available different wireless LANs and constructed a prototype system to evaluate the performance of the mobile router.
    Advanced Information Networking and Applications Workshops (WAINA), 2013 27th International Conference on; 01/2013
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    ABSTRACT: After the East Japan Great Earthquake in 2011, a robust network communication has been one of significant subjects for the study of Disaster Information System. Then, DTN (Delay Tolerant Network) has been focused for the effective methods for such inoperable network circumstances. However, when DTN is applied for the local areas, there are some problems such as message delivery rate and latency because there are fewer roads, cars, and pedestrians than in urban areas. Therefore, we propose the Enhanced Media Coordinate System for DTN to the architecture in order to provide the Data Triage, Node Selection based on its Territory, and Dynamic FEC (Forward Error Correction). In this paper, the proposed Data Triage Methods that provide the data priority by the user policy and the application type is especially explained, and the results of the computational simulation by the GIS map of a Japanese coastal town is reported. Then, the results are discussed for the future studies of DTN for Disaster Information Network System in local areas.
    Broadband and Wireless Computing, Communication and Applications (BWCCA), 2013 Eighth International Conference on; 01/2013
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    ABSTRACT: In this paper, we used the Great East Japan Earthquake as a learning experience, propose the disaster management support system used in the disaster countermeasures headquarters. This system is based GIS (geographical information system) using high-resolution Tiled Display Wall. The all functions of this system cooperates with GIS displayed on the Tiled Display Wall, and provides users with various interactions. By using this system, it becomes possible to manage all information in a unified manner in the disaster countermeasures headquarters. By consolidated management of information, the prompt action to various situations is attained in the disaster countermeasures headquarters.
    Network-Based Information Systems (NBiS), 2013 16th International Conference on; 01/2013
  • Saneatsu Arimura, Noriki Uchida, Yoshitaka Shibata
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    ABSTRACT: 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 organized in the sky on the disaster area and can cover shelters or interrupted communication area as urgent communication means. The system configuration and its function are described. A prototype system is constructed to evaluate its function and performance through several disaster application such as omni-directional video surveillance system.
    Advanced Information Networking and Applications Workshops (WAINA), 2013 27th International Conference on; 01/2013
  • Goshi Sato, Koji Hashimoto, Noriki Uchida, Yoshitaka Shibata
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    ABSTRACT: In this paper, we introduce a network link selection method for disaster oriented mobile network based on Software Defined Network framework using 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. Those wireless networks are interconnected by OpenFlow Switch and their links are managed by OpenFlow Controller. The proper communication links can be selected based on the required network characteristic, such as electro-magnetic field strength, throughput, latency, packet loss rate and communication distance. In this paper, we designed and implemented a disaster information wireless network with currently available different wireless LANs and constructed a prototype system to evaluate the performance of the mobile router.
    Innovative Mobile and Internet Services in Ubiquitous Computing (IMIS), 2013 Seventh International Conference on; 01/2013
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    ABSTRACT: 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 considered to affect the speed of rescue, evacuation, and sending life materials. DTN (Delay Tolerant Network) is supposed to be one of the effective methods to transmit significant data even under poor network conditions. However, when DTN is applied to local areas such as the Japanese Northern East coastal cities which were severely damaged by the earthquake, DTN might not work effectively. That is because there are some considerable problems such as fewer roads, cars, and pedestrians than in urban areas. Moreover, the scale of area is likely wider than that of urban areas because it includes many non-residential areas such as rice fields, gardens, and woods. Therefore, it is necessary to consider additional effective functions when DTN is applied for a Disaster Information Network System in local areas. In this paper, DTN with CWN (Cognitive Wireless Network) is proposed for a Disaster Information Network System for the usage of local areas. Then, we consider the actual usage of DTN in local areas, and the simulation of DTN with different wireless network interfaces as held by the GIS data of Taro, Miyako City, Iwate in Japan, a town severely damaged by the East Japan Great Earthquake. The results and future studies are discussed for the DTN usage of Disaster Information Network System in local areas.
    Advanced Information Networking and Applications Workshops (WAINA), 2013 27th International Conference on; 01/2013
  • Noriki Uchida, Noritaka Kawamura, Yoshitaka Shibata
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    ABSTRACT: It has been already one year and ten months since the East Japan Great Earthquake in 2011. Even now, there are still so many problems including political problems for the reconstruction from the earthquake, but some newly disaster related researches are also being carried out for the reconstruction of the damaged cities. DTN (Delay Tolerant Network) is supposed to be one of the effective methods to transmit even under poor network conditions. However, when DTN is applied to local areas such as Taro in Japan, DTN might not work effectively because there are fewer roads, cars, and pedestrians than in urban areas. Therefore, this paper deals with DTN with (CWN) Cognitive Wireless Network consists of multiple wireless interfaces as proposed by a Disaster Information Network System in order to set up in local areas. Then, considering the actual usage of DTN in local areas, the simulation is held according to the map of Taro in Japan, the severely damaged town in the East Japan Great Earthquake. The proposal methods are simulated by the Epidemic Routing and Spray and Wait Routing in comparison with single IEEE802.11b/g and amateur radio. Then, the results are discussed for the future studies of DTN usages for Disaster Information Network System in local areas.
    Complex, Intelligent, and Software Intensive Systems (CISIS), 2013 Seventh International Conference on; 01/2013
  • Yasuo Ebara, Satoshi Noda, Akira Sakuraba, Yoshitaka Shibata
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    ABSTRACT: In order to realize high-realistic sensation tele-communication over wide-area network, we consider that non-verbal communication play an important role, and displaying the existence of participant by high-quality video streaming on large-scale screen system in each remote site is effective. However, the display specification of these systems such as commercial projector and wide-area monitor is low-resolution, and displaying of real video streaming with sufficient quality is difficult. Moreover, displaying video streaming with realistic high-resolution is serious, because there is a limit in the display resolution of video image captured by a single camera. We have constructed the tele-communication environment to display ultra resolution video streaming by multi-transmitting each video image which captured by four cameras with tiled display wall which is a technology to display various high-resolution contents by configuring the large-scale display with two or more LCD panels. In this paper, we have conducted an experiment on ultra-resolution video transmission between remote sites via wide-area network by using this tiled display wall environment in order to examine the feasibility of high-realistic sensation tele-communication, and have reported the experimental results.
    Network-Based Information Systems (NBiS), 2013 16th International Conference on; 01/2013
  • Goshi Sato, Noriki Uchida, Yoshitaka Shibata
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    ABSTRACT: Since the conventional communication means are severely damaged and cannot be functioned at the occurrence of disaster, more robust and redundant information infrastructure has to be constructed to prepare the estimated large disasters. In this paper, we reported the implementations and evaluation of the resilient network system, which is based on cognitive wireless network framework in order to provide a robust and quick recovery from the damages. In the proposed methods, we introduced autonomous wireless link and path changes by the network environment and user policy changes, and the prototype is used for the evaluation of the proposed methods.
    Innovative Mobile and Internet Services in Ubiquitous Computing (IMIS), 2013 Seventh International Conference on; 01/2013
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    ABSTRACT: Understanding of damage information in disaster situation is the most important role for emergency response headquarters in order to provide relief action. Although responder in actual large-scale disaster situation could not deal damage situation easily that is ascribable to difficulty for understanding of spatiotemporally damage information. This paper proposes a GIS based disaster situation displaying and sharing approach system for represent disaster damage information at emergency response headquarters in large-scale disaster, to provide association between geolocation and multimedia content which is taken into disaster affected area. Our approach presents images of damage situation upon digital map on a high resolution single and large sized display, allows helping of damage by detail of damage situation in specific area not only showing it. We designed system architecture, use case of system and human computer interaction under operation for damage situation collection on large scale tiled display system. This system can be connected multiple counter disaster sites each other with disaster controlling network in an effort to share digital pictures and/or videos of disaster situation. We also discuss task oriented intuitive input method for our disaster information GIS. We will use some tablet devices in each site to make considerations interaction of system with multiple users.
    Network-Based Information Systems (NBiS), 2013 16th International Conference on; 01/2013