Yoshitaka Shibata

Saitama Institute of Technology, Saitama, Saitama, Japan

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Publications (93)1.01 Total impact

  • [Show abstract] [Hide abstract]
    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.
    Int. J. of Adaptive and Innovative Systems. 01/2014; 2(1):29 - 42.
  • Yutaka Sasaki, Yoshitaka Shibata
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    ABSTRACT: Each local government provides a sharing system of disaster area information and safety information at a disaster. However, when a large-disaster occurs, disaster information system may not be available in the situation that a communication infrastructure was destroyed. In this study, we propose the disaster information system that is usually changes two kind of reporting methods at time and a disaster. In addition, the information dispatch from a stricken area at the time of disaster is enabled in the proposed system. That is because mobile server relays the data that occurred from disaster information system.
    01/2012;
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    ABSTRACT: In the actual disaster case, there is certain possibility that electric power line is damaged and power energy cannot be supplied to those communication network devices, eventually those wireless LANs cannot be functioned. Although mobile wireless network is easy to reconstruct than wired network, there may be the case that network disconnection is not affordable after disaster. That is, Disaster Information System needs a robust Never Die Network (NDN) which will be unaffected by any changes in environment after severe disaster. However, if the network is consisted with Satellite System, there are the problems of network throughput is low, cost is high and so on. In case of wireless LANs, there are the problems of physical characteristics and so on. In this paper, we introduce nobel functions for Never Die Network which consisted of Satellite System and Cognitive Wireless Network.
    01/2012;
  • Yoshitaka Shibata, Noriki Uchida, Yuji Ohashi
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    ABSTRACT: 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 America. Also, the large-scale earthquake brought the secondary disasters such as blackout, fire, and nuclear crisis. Many information network systems are also severely damaged with the East Japan Great Earthquake. Compared with the recent historical severe earthquakes in Japan such as Hanshin-Awaji Great Earthquake in 1995 and Chuetsu Earthquake in 2004, there were many different types of problems because of the recent highly developed information society. They were the congestion of cellar phone, the lack of fuels and electricity, and so on. In this paper, the problems of information network systems on East Japan Great Earthquake are analyzed, and the solutions of these problems are discussed. Through our network reconstructing activity just after the earthquake, the connection of information network is the most important other than throughput or latency for disaster information system. In fact, satellite system, wireless LAN, and cognitive wireless system were useful for the reactivating network connection in the disaster area.
    01/2012;
  • Toshihiro Suzuki, Yoshitaka Shibata
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    ABSTRACT: In Japan, there have been a number of serious natural disasters such as earthquakes, tsunami, as represented by the East Japan Great Earthquake in 2011. When a large scale disaster occurs, information and communication technology (ICT) performs important rule to save the human life from the disaster and to reduce disaster victims. Particularly in mountainous areas, the residents are completely isolated from other areas due to the disconnection and distraction of telecommunication means. In the stricken area, inter-vehicle communication technology is much more suitable from the points of mobility and electric power supply for telecommunication equipments because communication network can be quickly reconfigured and the network topology can be easily and quickly developed. However, since in mountain area, the place where a vehicles node is arranged is limited, it is necessary to expand the communication distance between the vehicle nodes as much as possible. In this paper, in order to establish the long distance communication in wireless network environment, a dynamic antenna direction control method is introduced to maximize the throughput or minimize the packet loss rate and round trip time between the target vehicle nodes by automatically controlling the antenna direction. The prototype system is constructed and its performance analysis were carried out and verify our suggested system.
    01/2012;
  • Noriki Uchida, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: On March 11, 2011, a massive 9.0 magnitude earthquake hit the Pacific Ocean nearby Northeastern Japan causing damage with blackouts, fire, tsunami and nuclear plant crisis. 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 America. Recorded as 9.0 on the Richter scale, it was the most powerful quake ever to hit the country. Because of this large scale disaster, communication network was break down in wide area of the Northern Japan, and the coast side was especially heavily damaged. The disconnection of communication system brought serious problems for rescue and evacuation, and it was also caused the delay of the activities. This paper is the report of network relief activities for reactivating communication system in the coast side of Iwate Prefecture, and it is discussed about what kinds of requirements is needed for such a large scale disaster. With our activities, electricity and fuel are seriously needed at the first. Then, satellite system was effective for reactivating network connection in the severe disaster area.
    01/2012;
  • Noriki Uchida, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: A massive 9.0 magnitude earthquake hit the Pacific Ocean nearby Northeastern Japan causing damage On March 11, 2011. Recorded as 9.0 on the Richter scale, it was the most powerful quake ever to hit the country and caused severe damages over northern parts of Japan. This paper is discussed about the quick reports of communication traffic analysis and connectivity in the disaster area where electrity and network connection was survived. Then, our proposed Never Die Network in Disaster Information System is discussed with considering user policy from the reports. Just After the earthquake, network conditions were not enough to held multimedia communication because many network machines were damaged. However, it was very important to keep even minimal network connection to use Disaster Information System such as live, shelters, life line, and so on can be used. Our proposed Disaster Information System needs such a robust Never Die Network which will be provided the least transmission service even after severe disaster. Thus, we introduce Satellite System for optimal transmission control method in Cognitive Wireless Network in order to consider with severe disaster. First, as our previous study considering user policy, proper wireless link and route selection is held by Extend AHP and Extend AODV with Min-Max AHP value methods for optimal transmission control in Cognitive Wireless Network. Then, it is discussed about additional functions using satellite system in NDN. In the simulation, ns2 are used for the computational results to the effectiveness of the suggested transmission methods.
    2011 International Conference on Broadband, Wireless Computing, Communication and Applications, BWCCA 2011, Barcelona, Spain, October 26-28, 2011; 01/2011
  • Noriki Uchida, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: Severe damages hits at the Northern part of Japan on March 11, 2011. A massive 9.0 magnitude earthquake caused network disconnection over the wide area of Japan, and it brought serious damages with blackouts, fire, tsunami and nuclear plant crisis. Recorded as 9.0 on the Richter scale, it was the most powerful quake ever to hit Japan. At this disaster, our project team held network relief activities in some coast cities in Iwate prefecture. The satellite system and 3G system is provided as the network relief activities. In this paper, our network relief activities in evacuated places or disaster headquarters are introduced. Then, with the consideration of the activities, the policies under large scale disaster are discussed for the proposal data transmission methods of Cognitive Wireless Network.
    2011 Third International Conference on Intelligent Networking and Collaborative Systems (INCoS), Fukuoka, Japan, November 30 - Dec. 2, 2011; 01/2011
  • Noriki Uchida, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: Wireless network is one of useful methods for Disaster Information Network, because it is easy to recover the reconfiguration of network topology and strong for disaster such as earthquake. However conventional wireless network consisted of single wireless interface has some problems such as the limitation of transmission distance or throughput because of their characteristics of radio frequency. Moreover, since user demands under emergent situation are changing through time, QoS of Disaster Information Network needs to consider such as emergent user policy. Cognitive Wireless Network consisted of multiple wireless interfaces and multiple wireless routes is considered as one of the powerful technologies to solve the problems as the previous. Therefore we have studied the transmission control methods of Cognitive Wireless Network in Disaster Information Network considering with wireless network conditions and user policy. In our proposal methods, Extend AHP is used for the optimal wireless link selection with wireless network conditions and user policy, and Extend AODV with Min-Max AHP values is applied for the optimal wireless route selection. In this paper, our proposal methods is evaluated by the simulation of rural area of Disaster Information Network, and the results of the experimentation is reported. In the simulation, ns2 is used to verify the effectiveness of the suggested transmission methods in Cognitive Wireless Network. The results showed our proposal methods make better network conditions in Disaster Information Network in rural area.
    01/2011;
  • Noriki Uchida, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: On March 11, 2011, a massive 9.0 magnitude earthquake hit the Pacific Ocean nearby Northeastern Japan causing damage with blackouts, fire, tsunami and nuclear plant crisis. 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 America. Recorded as 9.0 on the Richter scale, it was the most powerful quake ever to hit the country. This paper is the report of communication traffic analysis and connectivity in Iwate Prefectural University located in middle area of Iwate prefecture in Japan after quake was hit. Although network conditions were not enough to held multimedia communication and many network machines were damaged, mail and SNS services were possible to use under the conditions. Moreover, the activity in the university at the disaster and future requirements for disaster information system is discussed.
    The 14th International Conference on Network-Based Information Systems, NBiS 2011, Tirana, Albania, September 7-9, 2011; 01/2011
  • Noriki Uchida, Goshi Sato, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: Cognitive wireless network consisted of multiple different types of wireless interface is one of efficient wireless transmission methods for Disaster Information Network, because it solves single wireless network problems like characteristics of wireless frequency or congestion form the use of same radio frequency. However, even if Disaster Information Network consisted of Cognitive Wireless Network, some of wireless node might be broken after severe disaster is happened. Therefore, it is necessary to consider about additional functions which the system never die. In this paper, we introduce Satellite System for optimal transmission control method in Cognitive Wireless Network in order to consider with severe disaster. First, as our previous study, proper wireless link and route selection is held by Extend AHP and Extend AODV with Min-Max AHP value methods for optimal transmission control in Cognitive Wireless Network. Then, check-alive function, alternate data transmission function, possible alternative route suggestion, and network reconfiguration are introduced to our proposed Disaster Information Network by using Satellite System. In the simulation, ns2 are used for the computational results to the effectiveness of the suggested transmission methods in the hybrid system of cognitive wireless and satellite network system.
    25th IEEE International Conference on Advanced Information Networking and Applications, AINA 2011, Biopolis, Singapore, March 22-25, 2011; 01/2011
  • Keita Saito, Yutaka Sasaki, Noriki Uchida, Yoshitaka Shibata
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    ABSTRACT: So far, the disaster information has been offered based on a text and an image conventionally. With the substantiality of the recent information infrastructure, a disaster prevention system can offer disaster information on top of Web-GIS a lot. Because information of the stricken area is not considered as the form which takes care of temporal occasion in the existing system, the time change of the disaster cannot be adequately identified. In this paper, we established a domain called the seek bar which can make change disaster information in Web-GIS seamlessly with an axis in time and offered unified operations by chronological order. Thus, using seek bar operations, the disaster information combining with Web-GIS functions can be shown to observe in the temporal and special expressions to easily understand the tendency of disaster in elapsed time.
    International Conference on Complex, Intelligent and Software Intensive Systems, CISIS 2011, June 30 - July 2, 2011, Korean Bible University, Seoul, Korea; 01/2011
  • Goshi Sato, Ryu Sygimoto, Noriki Uchida, Yoshitaka Shibata
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    ABSTRACT: Disaster information network is very important for people in many countries, particularly in Japan because there are many serious disasters have occurred annually. So far we have developed a disaster information network based on wireless LANs because of their mobility, portability and easy installation. In order to improve the connectivity and to attain the longer communication distance, we introduce a dynamic network configuration based cognitive Radio LANs. Currently available wireless LANs such as IEEE802.11b,g,j,n, IEEE802.16, cellular network, personal wireless network are combined with a mobile router and loaded on a car to quickly build a emergency temporal disaster information network when the usual communication network infrastructure was seriously damaged. In this paper, we designed and implemented a wireless mobile network using currently available different wireless network and pc based routers. Its network architecture and network protocol are specified to realize high performance connectivity and throughput. A simple prototype system is constructed to evaluate the functional and performance. As a result, we could verify the feasibility of effective and flexible disaster information network.
    International Conference on Complex, Intelligent and Software Intensive Systems, CISIS 2011, June 30 - July 2, 2011, Korean Bible University, Seoul, Korea; 01/2011
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    Yasuhiro Kawano, Koji Hashimoto, Yoshitaka Shibata
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    ABSTRACT: As broadband network services and video streaming systems become more common, high-definition (HD) quality stream format has become increasingly popular in live video distribution. Today's video streaming systems are used for a variety of purposes, but those systems require much bandwidth and CPU power for video streams. In this paper, we focus on the design of a relay path selection method on community-based resource sharing networks, which is able to select and use suitable stream paths cooperatively in sharing resources. On live video distribution, a candidate relay path list is created when users request to receive live video streams, and the best path is selected. If a new relay node is required, the suitable relay node is placed on a shared terminal in consideration of available resource status. Our experiments by a prototype system show that our method is successful in realisation of the suitable relay path selection and live video streaming on shared terminals.
    Int. J. of Multimedia Intelligence and Security. 01/2011; 2(1):18 - 35.
  • [Show abstract] [Hide abstract]
    ABSTRACT: In the actual disaster case, there is a certain possibility that electric power line is damaged and power energy cannot be supplied to those communication network devices, and eventually those wireless LANs cannot be functioned. Although mobile wireless network is easy to reconstruct than wired network, there may be the case that network disconnection is not affordable after disaster. That is, Disaster Information System needs a robust Never Die Network (NDN) which will be unaffected by any changes in environment after severe disaster. Satellite Network System is one of possible solution for such a severe disaster, but it has some problems like low throughput, large latency, high cost, and so on. On the other hands, single wireless communication like IEEE802.11a/b/g also have some problems like a possible transmission distance, throughput limitation for maintaining QoS for urgent user's situations. Therefore, NDN needs to consider about additional functions for these problems of Satellite and Wireless Network System. In this paper, we introduce Satellite System for optimal transmission control method in Cognitive Wireless Network in order to consider with severe disaster. First, as our previous study, proper wireless link and route selection is held by Extend AHP and Extend AODV with Min-Max AHP value methods for optimal transmission control in Cognitive Wireless Network. Then, check-alive function, alternate data transmission function, possible alternative route suggestion, and network reconfiguration are introduced to our proposed Disaster Information Network by using Satellite System. In the simulation, ns2 are used for the computational results to the effectiveness of the suggested transmission methods in the hybrid system of cognitive wireless and satellite network system.
    International Conference on Complex, Intelligent and Software Intensive Systems, CISIS 2011, June 30 - July 2, 2011, Korean Bible University, Seoul, Korea; 01/2011
  • Noriki Uchida, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: Recently, technology of cloud computing has been rapidly developed, and it is expected to apply for various network services. Virtual technology is a part of significant technology which has been contributed for the development of cloud computing. Various virtual technologies such as virtual OS and VDE become very important for server and network management in these days. Furthermore, such a virtual technology becomes possible to provide efficient resource management or QoS with virtual network configuration. Thus, it will be important for network construction to provide hardware and software service in near future. Autonomous network configuration in virtual layer is one of such a service. Not only network configuration is constructed in physical layer, but also it should be constructed in virtual layer for providing optimal resource and QoS management. In this paper, Overlay Cloud Computing Service is proposed, and it is consisted of virtual autonomous network configuration in cloud computing service including various server and network services. In our proposal methods, first of all, there are various kinds of user policy such as eco mode, high power mode, and secure mode. Then, virtual network and server configuration is automatically held in virtual layer with the mode setting and hardware configuration. Besides, with observation values of network and server condition, virtual configuration is changed optimally. In this optimal configuration changes, Kalman filter is used for the calculation of network and server condition. Then, with the results of calculation, virtual network topology is changed. In this paper, first, introduction and cloud computing service is discussed. Then, our proposed Overlay Cloud Computing Service by autonomous network configuration is introduced. In the chapter, optimal control method by Kalman filter with observed values is also introduced. Finally, conclusion and future study is discussed.
    01/2011;
  • Noriki Uchida, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: Remarkable wireless networks technology developments have made us to expect the realization of new applications like the advanced traffic system, the disaster prevention system, and the adhoc network system. However some of new wireless network services need the network which is never died. In this paper, Never Died Network with the Combination of Cognitive Wireless Network and Satellite System. The location and environment of each nodes are acquired by using Satellite System, and then the information is used for Cognitive Wireless Network to confirm proper wireless point, link, and route. Finally, the simulation is held for the proposal system.
    The 13th International Conference on Network-Based Information Systems, NBiS 2010, Takayama, Gifu, Japan, 14-16 September 2010; 01/2010
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    ABSTRACT: In this paper, the influence of our proposed Urban Disaster Information System by moving objects is experimented and discussed. It is widely known that the network conditions between wireless node and the setup wireless LAN (Access point) is influenced by moving objects like cars, animals, and bullet train. Therefore, Disaster Information System in urban area is necessary to consider with the influences by such moving objects in order to maintain QoS like audio and video transmission. The field experiment is held by using moving cars and rains, and the observed results are discussed for the influence for the our proposed Disaster Information Networks.
    The 13th International Conference on Network-Based Information Systems, NBiS 2010, Takayama, Gifu, Japan, 14-16 September 2010; 01/2010
  • Yutaka Sasaki, Wei Kang, Yoshitaka Shibata
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    ABSTRACT: In the past, the disaster information has been offered based on a text and an image conventionally. With the substantiality of the recent information infrastructure, it is suggested a disaster prevention system to offer in the form that put disaster information on top of one another on Web-GIS a lot. Because the information of the stricken area was not offered in the form that considered an axis in time by the existing system, there was the problem that cannot read stricken area information to change with time adequately. In this study, I established the domain called the seek bar which changed information in Web-GIS seamlessly with an axis in time and offered unified chronological order operation and I could express stricken area information to change with time and did it.
    The 13th International Conference on Network-Based Information Systems, NBiS 2010, Takayama, Gifu, Japan, 14-16 September 2010; 01/2010
  • Noriki Uchida, Goshi Sato, Kazuo Takahata, Yoshitaka Shibata
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    ABSTRACT: 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, selective transmission control method in cognitive wireless network considering with cross layers including user policies is proposed. First, at the observation stage, the physical data such as user policy, electric field strength, bit error rate, jitter, latency, packet error rate, and throughput are observed. Then, at the decision stage, AHP (Analytic hierarchy process) is applied for decision making process with those parameters. Finally, the action stage, one of the suitable link is chosen and changed links and networks. Also, the route selecting method is proposed based on AODV protocols. When route changes come to need, considerable wireless routes are listed by AODV protocol including network conditions. Then, the following three methods are used for route selection; 1)Route selection so that Maximizing End-to-End throughput among all of the routes for CBR. 2) Route selection so that Minimizing End-to-End delay time among all of the routes for VoIP. 3) Route selection so that Optimize the policy based AHP for Web service. In our simulation, ns2 is used for the computational results to the effectiveness of the suggested transmission methods in cognitive wireless networks. The results showed the effectiveness of the proposed methods.
    30th IEEE International Conference on Distributed Computing Systems Workshops (ICDCS 2010 Workshops), 21-25 June 2010, Genova, Italy; 01/2010