The Experts below are selected from a list of 6051 Experts worldwide ranked by ideXlab platform
Nei Kato - One of the best experts on this subject based on the ideXlab platform.
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On Efficient Traffic Distribution for Disaster Area Communication Using Wireless Mesh Networks
Wireless Personal Communications, 2014Co-Authors: Mostafa M Fouda, Hiroki Nishiyama, Ryu Miura, Nei KatoAbstract:In recent time, a great deal of research effort has been directed toward promptly facilitating post-Disaster communication by using wireless mesh networks (WMNs). WMN technology has been considered to be effectively exploited for this purpose as it provides multi-hop communication through an access network comprising wireless mesh routers, which are connected to the Internet through gateways (GWs). One of the critical challenges in using WMNs for establishing Disaster-recovery networks is the issue of distributing traffic among the users in a balanced manner in order to avoid congestion at the GWs. To overcome this issue, we envision a Disaster Zone WMN comprising a network management center. First, we thoroughly investigate the problem of traffic load balancing amongst the GWs in our considered Disaster Zone WMN. Then, we develop traffic load distribution techniques from two perspectives. Our proposal from the first perspective hinges upon a balanced distribution of the bandwidth to be allocated per user. On the other hand, our second perspective considers the dynamic (i.e., varying) bandwidth demands from the Disaster Zone users that requires a more practical and refined distribution of the available bandwidth by following an intelligent forecasting method. The effectiveness of our proposals is evaluated through computer-based simulations.
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Disaster resilient networking a new vision based on movable and deployable resource units
IEEE Network, 2013Co-Authors: Toshikazu Sakano, Hiroki Nishiyama, Nei Kato, Zubair Md Fadlullah, Masataka Nakazawa, Fumiyuki Adachi, Atsushi Takahara, Tomoaki Kumagai, H Kasahara, S KuriharaAbstract:During the great east Japan earthquake on March 11, 2011, a lot of ICT resources - telecom switching offices, optical fiber links, and so forth - were completely or partially damaged due to the tremor and the resultant tsunami. As a consequence, the demand for ICT services explosively increased, mainly because the people of the affected areas were trying desperately to communicate with the outside world that led to a phenomenal rise in the network traffic. In the Nippon Telegraph and Telephone (NTT) East Corporation alone, 385 telephone offices stopped operating immediately following the earthquake because of power outages and disruption of facilities. Approximately 1.5 million users were cut off from using fixed-line telephone service. The demand for fixed-line and mobile telephone services jumped up to 10-50 times the usual. This gave rise to serious traffic congestion, and the emergency ICT networks and services could not deal with this issue sufficiently. This article proposes a network architecture that is resilient even through devastating Disasters by effectively exploiting specially designed movable and deployable resource units, which we refer to as MDRUs. An MDRU having the ability to accommodate communication and information processing functions can be rapidly transported or moved to the Disaster Zone, and can be deployed within a reasonably short time to establish the network at the Disaster site and launch ICT services. The concept and configuration of the network architecture based on the MDRU and its features are described in this article. Some preliminary simulation results are also reported to evaluate the performance of our adopted MDRU-based Disaster resilient network.
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a novel heuristic based traffic distribution method for Disaster Zone wireless mesh networks
International Conference on Communications, 2012Co-Authors: Mostafa M Fouda, Hiroki Nishiyama, Nei KatoAbstract:Recently, the research community has paid much attention to Wireless Mesh Networks (WMNs) for rapidly formulating Disaster Zone networking infrastructures. These multi-hop WMNs, with almost stationary wireless Mesh Routers (MRs) as an access network, and gateways (GWs) connected to Internet, present an attractive choice for quickly establishing post-Disaster recovery networks. However, one of the main challenges in such infrastructures consists in the traffic distribution among the users for avoiding congested GWs. In this paper, we focus on the issue of distributing and balancing the traffic load among the main GWs of the Disaster Zone WMN. We propose a novel method for controlling the handover of some of the MRs connected to the congested GWs. The performance of our method is evaluated by conducting computer-based simulations. The simulation-results demonstrate the effectiveness of our proposed method in keeping the number of network-configuration changes to minimal while resulting in a better Fairness Index compared with other conventional techniques.
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ICCC - A novel heuristic-based traffic distribution method for Disaster Zone Wireless Mesh Networks
2012 1st IEEE International Conference on Communications in China (ICCC), 2012Co-Authors: Mostafa M Fouda, Hiroki Nishiyama, Nei KatoAbstract:Recently, the research community has paid much attention to Wireless Mesh Networks (WMNs) for rapidly formulating Disaster Zone networking infrastructures. These multi-hop WMNs, with almost stationary wireless Mesh Routers (MRs) as an access network, and gateways (GWs) connected to Internet, present an attractive choice for quickly establishing post-Disaster recovery networks. However, one of the main challenges in such infrastructures consists in the traffic distribution among the users for avoiding congested GWs. In this paper, we focus on the issue of distributing and balancing the traffic load among the main GWs of the Disaster Zone WMN. We propose a novel method for controlling the handover of some of the MRs connected to the congested GWs. The performance of our method is evaluated by conducting computer-based simulations. The simulation-results demonstrate the effectiveness of our proposed method in keeping the number of network-configuration changes to minimal while resulting in a better Fairness Index compared with other conventional techniques.
G. Blike - One of the best experts on this subject based on the ideXlab platform.
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Investigating respiratory variation using a forehead reflectance pulse oximeter to identify airway obstruction for automated remote triage
Proceedings of the IEEE 31st Annual Northeast Bioengineering Conference 2005., 2005Co-Authors: J.m. Chang, S.p. Mcgrath, G. BlikeAbstract:An automated triage system called ARTEMIS has been developed in an effort to improve combat and multicasualty care within the battlefield or Disaster Zone. The status of airway, breathing, and circulation is critical in these types of situations. This preliminary study uses sleep apnea patients to determine whether certain features can be extracted from the photoplethysmograph of a Nonin/spl reg/ forehead reflectance pulse oximeter, which might be indicative of airway obstruction.
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The feasibility of using a forehead reflectance pulse oximeter for automated remote triage
IEEE 30th Annual Northeast Bioengineering Conference 2004. Proceedings of the, 2004Co-Authors: S. Wendelken, S. Mcgrath, G. Blike, M. AkayAbstract:The extreme conditions of combat and multi-casualty rescue often make field triage difficult and put the medic or first responder at risk. In an effort to improve Reid triage, we have developed an automated remote triage system called ARTEMIS for use in the battlefield or Disaster Zone. This preliminary research seeks to empirically demonstrate that the Nonin forehead reflectance pulse oximeter is a viable sensor for measuring essential physiological parameters used in automated field triage systems such as ARTEMIS.
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Using a forehead reflectance pulse oximeter to detect changes in sympathetic tone
The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1Co-Authors: S. Wendelken, M. Akay, Susan P. Mcgrath, G. BlikeAbstract:The extreme conditions of combat and multi-casualty rescue often make field triage difficult and put the medic or first responder at risk. In an effort to improve field triage, we have developed an automated remote triage system called ARTEMIS (automated remote triage and emergency management information system) for use in the battlefield or Disaster Zone. Common to field injuries is a sudden change in arterial pressure resulting from massive blood loss or shock. In effort to stabilize the arterial pressure, the sympathetic system is strongly activated and sympathetic tone is increased. This preliminary research seeks to empirically demonstrate that a forehead reflectance pulse oximeter is a viable sensor for detecting sudden changes in sympathetic tone. We performed the classic supine-standing experiment and collected the raw waveform, the photoplethysmogram (PPG), continuously using a forehead reflectance pulse oximeter. The resulting waveform was processed in Matlab using various spectral analysis techniques (FFT and AR). Our preliminary results show that a relative ratio analysis (low frequency power/high frequency power) for both the raw PPG signal and its derived pulse statistics (height, beat-to-beat interval) is a useful technique for detecting change in sympathetic tone resulting from positional change.
Hiroki Nishiyama - One of the best experts on this subject based on the ideXlab platform.
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On Efficient Traffic Distribution for Disaster Area Communication Using Wireless Mesh Networks
Wireless Personal Communications, 2014Co-Authors: Mostafa M Fouda, Hiroki Nishiyama, Ryu Miura, Nei KatoAbstract:In recent time, a great deal of research effort has been directed toward promptly facilitating post-Disaster communication by using wireless mesh networks (WMNs). WMN technology has been considered to be effectively exploited for this purpose as it provides multi-hop communication through an access network comprising wireless mesh routers, which are connected to the Internet through gateways (GWs). One of the critical challenges in using WMNs for establishing Disaster-recovery networks is the issue of distributing traffic among the users in a balanced manner in order to avoid congestion at the GWs. To overcome this issue, we envision a Disaster Zone WMN comprising a network management center. First, we thoroughly investigate the problem of traffic load balancing amongst the GWs in our considered Disaster Zone WMN. Then, we develop traffic load distribution techniques from two perspectives. Our proposal from the first perspective hinges upon a balanced distribution of the bandwidth to be allocated per user. On the other hand, our second perspective considers the dynamic (i.e., varying) bandwidth demands from the Disaster Zone users that requires a more practical and refined distribution of the available bandwidth by following an intelligent forecasting method. The effectiveness of our proposals is evaluated through computer-based simulations.
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Disaster resilient networking a new vision based on movable and deployable resource units
IEEE Network, 2013Co-Authors: Toshikazu Sakano, Hiroki Nishiyama, Nei Kato, Zubair Md Fadlullah, Masataka Nakazawa, Fumiyuki Adachi, Atsushi Takahara, Tomoaki Kumagai, H Kasahara, S KuriharaAbstract:During the great east Japan earthquake on March 11, 2011, a lot of ICT resources - telecom switching offices, optical fiber links, and so forth - were completely or partially damaged due to the tremor and the resultant tsunami. As a consequence, the demand for ICT services explosively increased, mainly because the people of the affected areas were trying desperately to communicate with the outside world that led to a phenomenal rise in the network traffic. In the Nippon Telegraph and Telephone (NTT) East Corporation alone, 385 telephone offices stopped operating immediately following the earthquake because of power outages and disruption of facilities. Approximately 1.5 million users were cut off from using fixed-line telephone service. The demand for fixed-line and mobile telephone services jumped up to 10-50 times the usual. This gave rise to serious traffic congestion, and the emergency ICT networks and services could not deal with this issue sufficiently. This article proposes a network architecture that is resilient even through devastating Disasters by effectively exploiting specially designed movable and deployable resource units, which we refer to as MDRUs. An MDRU having the ability to accommodate communication and information processing functions can be rapidly transported or moved to the Disaster Zone, and can be deployed within a reasonably short time to establish the network at the Disaster site and launch ICT services. The concept and configuration of the network architecture based on the MDRU and its features are described in this article. Some preliminary simulation results are also reported to evaluate the performance of our adopted MDRU-based Disaster resilient network.
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a novel heuristic based traffic distribution method for Disaster Zone wireless mesh networks
International Conference on Communications, 2012Co-Authors: Mostafa M Fouda, Hiroki Nishiyama, Nei KatoAbstract:Recently, the research community has paid much attention to Wireless Mesh Networks (WMNs) for rapidly formulating Disaster Zone networking infrastructures. These multi-hop WMNs, with almost stationary wireless Mesh Routers (MRs) as an access network, and gateways (GWs) connected to Internet, present an attractive choice for quickly establishing post-Disaster recovery networks. However, one of the main challenges in such infrastructures consists in the traffic distribution among the users for avoiding congested GWs. In this paper, we focus on the issue of distributing and balancing the traffic load among the main GWs of the Disaster Zone WMN. We propose a novel method for controlling the handover of some of the MRs connected to the congested GWs. The performance of our method is evaluated by conducting computer-based simulations. The simulation-results demonstrate the effectiveness of our proposed method in keeping the number of network-configuration changes to minimal while resulting in a better Fairness Index compared with other conventional techniques.
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ICCC - A novel heuristic-based traffic distribution method for Disaster Zone Wireless Mesh Networks
2012 1st IEEE International Conference on Communications in China (ICCC), 2012Co-Authors: Mostafa M Fouda, Hiroki Nishiyama, Nei KatoAbstract:Recently, the research community has paid much attention to Wireless Mesh Networks (WMNs) for rapidly formulating Disaster Zone networking infrastructures. These multi-hop WMNs, with almost stationary wireless Mesh Routers (MRs) as an access network, and gateways (GWs) connected to Internet, present an attractive choice for quickly establishing post-Disaster recovery networks. However, one of the main challenges in such infrastructures consists in the traffic distribution among the users for avoiding congested GWs. In this paper, we focus on the issue of distributing and balancing the traffic load among the main GWs of the Disaster Zone WMN. We propose a novel method for controlling the handover of some of the MRs connected to the congested GWs. The performance of our method is evaluated by conducting computer-based simulations. The simulation-results demonstrate the effectiveness of our proposed method in keeping the number of network-configuration changes to minimal while resulting in a better Fairness Index compared with other conventional techniques.
M. Akay - One of the best experts on this subject based on the ideXlab platform.
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The feasibility of using a forehead reflectance pulse oximeter for automated remote triage
IEEE 30th Annual Northeast Bioengineering Conference 2004. Proceedings of the, 2004Co-Authors: S. Wendelken, S. Mcgrath, G. Blike, M. AkayAbstract:The extreme conditions of combat and multi-casualty rescue often make field triage difficult and put the medic or first responder at risk. In an effort to improve Reid triage, we have developed an automated remote triage system called ARTEMIS for use in the battlefield or Disaster Zone. This preliminary research seeks to empirically demonstrate that the Nonin forehead reflectance pulse oximeter is a viable sensor for measuring essential physiological parameters used in automated field triage systems such as ARTEMIS.
-
Using a forehead reflectance pulse oximeter to detect changes in sympathetic tone
The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1Co-Authors: S. Wendelken, M. Akay, Susan P. Mcgrath, G. BlikeAbstract:The extreme conditions of combat and multi-casualty rescue often make field triage difficult and put the medic or first responder at risk. In an effort to improve field triage, we have developed an automated remote triage system called ARTEMIS (automated remote triage and emergency management information system) for use in the battlefield or Disaster Zone. Common to field injuries is a sudden change in arterial pressure resulting from massive blood loss or shock. In effort to stabilize the arterial pressure, the sympathetic system is strongly activated and sympathetic tone is increased. This preliminary research seeks to empirically demonstrate that a forehead reflectance pulse oximeter is a viable sensor for detecting sudden changes in sympathetic tone. We performed the classic supine-standing experiment and collected the raw waveform, the photoplethysmogram (PPG), continuously using a forehead reflectance pulse oximeter. The resulting waveform was processed in Matlab using various spectral analysis techniques (FFT and AR). Our preliminary results show that a relative ratio analysis (low frequency power/high frequency power) for both the raw PPG signal and its derived pulse statistics (height, beat-to-beat interval) is a useful technique for detecting change in sympathetic tone resulting from positional change.
S. Wendelken - One of the best experts on this subject based on the ideXlab platform.
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The feasibility of using a forehead reflectance pulse oximeter for automated remote triage
IEEE 30th Annual Northeast Bioengineering Conference 2004. Proceedings of the, 2004Co-Authors: S. Wendelken, S. Mcgrath, G. Blike, M. AkayAbstract:The extreme conditions of combat and multi-casualty rescue often make field triage difficult and put the medic or first responder at risk. In an effort to improve Reid triage, we have developed an automated remote triage system called ARTEMIS for use in the battlefield or Disaster Zone. This preliminary research seeks to empirically demonstrate that the Nonin forehead reflectance pulse oximeter is a viable sensor for measuring essential physiological parameters used in automated field triage systems such as ARTEMIS.
-
Using a forehead reflectance pulse oximeter to detect changes in sympathetic tone
The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1Co-Authors: S. Wendelken, M. Akay, Susan P. Mcgrath, G. BlikeAbstract:The extreme conditions of combat and multi-casualty rescue often make field triage difficult and put the medic or first responder at risk. In an effort to improve field triage, we have developed an automated remote triage system called ARTEMIS (automated remote triage and emergency management information system) for use in the battlefield or Disaster Zone. Common to field injuries is a sudden change in arterial pressure resulting from massive blood loss or shock. In effort to stabilize the arterial pressure, the sympathetic system is strongly activated and sympathetic tone is increased. This preliminary research seeks to empirically demonstrate that a forehead reflectance pulse oximeter is a viable sensor for detecting sudden changes in sympathetic tone. We performed the classic supine-standing experiment and collected the raw waveform, the photoplethysmogram (PPG), continuously using a forehead reflectance pulse oximeter. The resulting waveform was processed in Matlab using various spectral analysis techniques (FFT and AR). Our preliminary results show that a relative ratio analysis (low frequency power/high frequency power) for both the raw PPG signal and its derived pulse statistics (height, beat-to-beat interval) is a useful technique for detecting change in sympathetic tone resulting from positional change.