The Experts below are selected from a list of 1998 Experts worldwide ranked by ideXlab platform

Chengzhong Xu - One of the best experts on this subject based on the ideXlab platform.

  • a Reliable Connection migration mechanism for synchronous transient communication in mobile codes
    International Conference on Parallel Processing, 2004
    Co-Authors: Xiliang Zhong, Chengzhong Xu
    Abstract:

    With the increasing popularity of network applications, mobile codes become a promising technology to provide scalable services. Due to their mobile nature, it is a challenge to support synchronous transient communication between mobile objects. This work presents a Reliable Connection migration mechanism that allows mobile objects in communication to remain connected during their migration. This mechanism supports concurrent migration of both end-points of a Connection and guarantees exactly-once delivery of all transmitted data. In addition, a mobile code access control model is integrated to ensure secure Connection migration. This work presents the design of the mechanism and a reference implementation, namely NapletSocket, over Java Socket in a mobile agent system. Experimental results show that NapletSocket incurs a moderate cost in Connection setup, mainly due to security checking, and marginal overhead for communication over established Connections. Furthermore, we investigate the impact of agent mobility on communication performance via simulation. Simulation results show that NapletSocket is efficient for a wide range of migration and communication patterns.

  • ICPP - A Reliable Connection migration mechanism for synchronous transient communication in mobile codes
    2004
    Co-Authors: Xiliang Zhong, Chengzhong Xu
    Abstract:

    With the increasing popularity of network applications, mobile codes become a promising technology to provide scalable services. Due to their mobile nature, it is a challenge to support synchronous transient communication between mobile objects. This work presents a Reliable Connection migration mechanism that allows mobile objects in communication to remain connected during their migration. This mechanism supports concurrent migration of both end-points of a Connection and guarantees exactly-once delivery of all transmitted data. In addition, a mobile code access control model is integrated to ensure secure Connection migration. This work presents the design of the mechanism and a reference implementation, namely NapletSocket, over Java Socket in a mobile agent system. Experimental results show that NapletSocket incurs a moderate cost in Connection setup, mainly due to security checking, and marginal overhead for communication over established Connections. Furthermore, we investigate the impact of agent mobility on communication performance via simulation. Simulation results show that NapletSocket is efficient for a wide range of migration and communication patterns.

  • a Reliable and secure Connection migration mechanism for mobile agents
    International Conference on Distributed Computing Systems Workshops, 2004
    Co-Authors: Xiliang Zhong, Chengzhong Xu, Haiying Shen
    Abstract:

    Connection migration in mobile systems is to support continuous and transparent communication operations between mobile agents. We present a Reliable Connection migration mechanism that provides exactly-once delivery for all transmitted data during agent migration. It integrates with an agent-based access control mechanism that controls the access to network ports. To avoid frequent agent authentication and permission checking due to agent migration, a secret session key is associated with each Connection. We present the design and implementation of the mechanism, named NapletSocket in Naplet mobile agent system. It is a pure middleware implementation, requiring no modification of Java virtual machines. Evaluation results show that the NapletSocket system incurs a moderate overhead in Connection setup, mainly due to security checking. Once a secure Connection is established, only a marginal cost is needed to pay for Reliable communication during agent migration.

Shigeru Kashihara - One of the best experts on this subject based on the ideXlab platform.

  • a morphogenetic and evolutionary approach to regulating wireless access points for energy efficient and Reliable Connection services
    Congress on Evolutionary Computation, 2015
    Co-Authors: Kei Ohnishi, Kazuya Tsukamoto, Shigeru Kashihara
    Abstract:

    We propose a method for regulating wireless access points (APs) that is based on mechanisms of biological development and evolution. The purpose of the proposed regulation is to simultaneously achieve power savings in the APs and achieve Reliable Connection services through the APs better, which is shown to be a trade-off relationship in this study. The regulation target is the cycle time at which each AP enters the power-off state, which is referred to as the sleep cycle time. Biological development mechanisms form bodies of a variety of shapes using different genomes as design information, and these genomes are modified evolutionarily. Similarly, in the present study, a method inspired by biological development forms a variety of the sleep cycle times of APs, and an evolutionary method modifies the parameter values of the method inspired by the biological development in order to obtain better configurations of the APs. In addition, the regulation method is able to configure APs in a distributed manner without knowing global information; the total number of APs, their locations, or their identifiers, which is actually suitable for the situation assumed in the present study, in which APs are established and removed freely by their owners and AP users freely appear. Simulation results show that the proposed method is capable of exploring the tradeoff relationship between the amount of consumed power of the APs and the reliability of Connection services in terms of momentary achievement by regulating APs, but yields highly varying regulation results along time.

  • CEC - A morphogenetic and evolutionary approach to regulating wireless access points for energy-efficient and Reliable Connection services
    2015 IEEE Congress on Evolutionary Computation (CEC), 2015
    Co-Authors: Kei Ohnishi, Kazuya Tsukamoto, Shigeru Kashihara
    Abstract:

    We propose a method for regulating wireless access points (APs) that is based on mechanisms of biological development and evolution. The purpose of the proposed regulation is to simultaneously achieve power savings in the APs and achieve Reliable Connection services through the APs better, which is shown to be a trade-off relationship in this study. The regulation target is the cycle time at which each AP enters the power-off state, which is referred to as the sleep cycle time. Biological development mechanisms form bodies of a variety of shapes using different genomes as design information, and these genomes are modified evolutionarily. Similarly, in the present study, a method inspired by biological development forms a variety of the sleep cycle times of APs, and an evolutionary method modifies the parameter values of the method inspired by the biological development in order to obtain better configurations of the APs. In addition, the regulation method is able to configure APs in a distributed manner without knowing global information; the total number of APs, their locations, or their identifiers, which is actually suitable for the situation assumed in the present study, in which APs are established and removed freely by their owners and AP users freely appear. Simulation results show that the proposed method is capable of exploring the tradeoff relationship between the amount of consumed power of the APs and the reliability of Connection services in terms of momentary achievement by regulating APs, but yields highly varying regulation results along time.

  • SASO Workshops - Self-configuration of Wireless Access Points Based on Mechanisms of Biological Development and Evolution
    2010 Fourth IEEE International Conference on Self-Adaptive and Self-Organizing Systems Workshop, 2010
    Co-Authors: Kei Ohnishi, Kazuya Tsukamoto, Shigeru Kashihara
    Abstract:

    We propose a method for self-configuration of wireless access points (APs) that is inspired by mechanisms of biological development and evolution. The purpose of the proposed configuration is to simultaneously achieve power savings in the APs and achieve Reliable Connection services through the APs. The configuration target is the cycle time at which each AP enters the power-off state, which is referred to as the sleep cycle time. Biological development mechanisms form bodies of a variety of shapes using different genomes as design information, and these genomes are modified evolutionarily. Similarly, in the present study, a method inspired by biological development forms a variety of the sleep cycle times of APs, and an evolutionary method modifies the parameter values of the method inspired by the biological development in order to obtain better configurations of the APs. In addition, the regulation method is able to configure APs in a distributed manner without knowing global information, the total number of APs, their locations, or their identifiers, which is actually suitable for the situation assumed in the present study, in which APs are established and removed freely by their owners and AP users freely appear. Simulation results suggest that the proposed method is able to achieve power savings and Reliable Connection services under several assumptions.

Xiliang Zhong - One of the best experts on this subject based on the ideXlab platform.

  • a Reliable Connection migration mechanism for synchronous transient communication in mobile codes
    International Conference on Parallel Processing, 2004
    Co-Authors: Xiliang Zhong, Chengzhong Xu
    Abstract:

    With the increasing popularity of network applications, mobile codes become a promising technology to provide scalable services. Due to their mobile nature, it is a challenge to support synchronous transient communication between mobile objects. This work presents a Reliable Connection migration mechanism that allows mobile objects in communication to remain connected during their migration. This mechanism supports concurrent migration of both end-points of a Connection and guarantees exactly-once delivery of all transmitted data. In addition, a mobile code access control model is integrated to ensure secure Connection migration. This work presents the design of the mechanism and a reference implementation, namely NapletSocket, over Java Socket in a mobile agent system. Experimental results show that NapletSocket incurs a moderate cost in Connection setup, mainly due to security checking, and marginal overhead for communication over established Connections. Furthermore, we investigate the impact of agent mobility on communication performance via simulation. Simulation results show that NapletSocket is efficient for a wide range of migration and communication patterns.

  • ICPP - A Reliable Connection migration mechanism for synchronous transient communication in mobile codes
    2004
    Co-Authors: Xiliang Zhong, Chengzhong Xu
    Abstract:

    With the increasing popularity of network applications, mobile codes become a promising technology to provide scalable services. Due to their mobile nature, it is a challenge to support synchronous transient communication between mobile objects. This work presents a Reliable Connection migration mechanism that allows mobile objects in communication to remain connected during their migration. This mechanism supports concurrent migration of both end-points of a Connection and guarantees exactly-once delivery of all transmitted data. In addition, a mobile code access control model is integrated to ensure secure Connection migration. This work presents the design of the mechanism and a reference implementation, namely NapletSocket, over Java Socket in a mobile agent system. Experimental results show that NapletSocket incurs a moderate cost in Connection setup, mainly due to security checking, and marginal overhead for communication over established Connections. Furthermore, we investigate the impact of agent mobility on communication performance via simulation. Simulation results show that NapletSocket is efficient for a wide range of migration and communication patterns.

  • a Reliable and secure Connection migration mechanism for mobile agents
    International Conference on Distributed Computing Systems Workshops, 2004
    Co-Authors: Xiliang Zhong, Chengzhong Xu, Haiying Shen
    Abstract:

    Connection migration in mobile systems is to support continuous and transparent communication operations between mobile agents. We present a Reliable Connection migration mechanism that provides exactly-once delivery for all transmitted data during agent migration. It integrates with an agent-based access control mechanism that controls the access to network ports. To avoid frequent agent authentication and permission checking due to agent migration, a secret session key is associated with each Connection. We present the design and implementation of the mechanism, named NapletSocket in Naplet mobile agent system. It is a pure middleware implementation, requiring no modification of Java virtual machines. Evaluation results show that the NapletSocket system incurs a moderate overhead in Connection setup, mainly due to security checking. Once a secure Connection is established, only a marginal cost is needed to pay for Reliable communication during agent migration.

Dhabaleswar K Panda - One of the best experts on this subject based on the ideXlab platform.

  • scalable mpi design over infiniband using extended Reliable Connection
    International Conference on Cluster Computing, 2008
    Co-Authors: Matthew J Koop, Jaidev K Sridhar, Dhabaleswar K Panda
    Abstract:

    A significant component of a high-performance cluster is the compute node interconnect. InfiniBand, is an interconnect of such systems that is enjoying wide success due to low latency (1.0-3.0 musec) and high bandwidth and other features. The Message Passing Interface (MPI) is the dominant programming model for parallel scientific applications. As a result, the MPI library and interconnect play a significant role in the scalability. These clusters continue to scale to ever-increasing levels making the role very important. As an example, the ldquoRangerrdquo system at the Texas Advanced Computing Center (TACC) includes over 60,000 cores with nearly 4000 InfiniBand ports. Previous work has shown that memory usage simply for Connections when using the Reliable Connection (RC) transport of InfiniBand can reach hundreds of megabytes of memory per process at that level. To address these scalability problems a new InfiniBand transport, eXtended Reliable Connection, has been introduced. In this paper we describe XRC and design MPI over this new transport. We describe the variety of design choices that must be made as well as the various optimizations that XRC allows. We implement our designs and evaluate it on an InfiniBand cluster against RC-based designs. The memory scalability in terms of both Connection memory and memory efficiency for communication buffers is evaluated for all of the configurations. Connection memory scalability evaluation shows a potential 100 times improvement over a similarly configured RC-based design. Evaluation using NAMD shows a 10% performance improvement for our XRC-based prototype for the jac2000 benchmark.

  • CLUSTER - Scalable MPI design over InfiniBand using eXtended Reliable Connection
    2008 IEEE International Conference on Cluster Computing, 2008
    Co-Authors: Matthew J Koop, Jaidev K Sridhar, Dhabaleswar K Panda
    Abstract:

    A significant component of a high-performance cluster is the compute node interconnect. InfiniBand, is an interconnect of such systems that is enjoying wide success due to low latency (1.0-3.0 musec) and high bandwidth and other features. The Message Passing Interface (MPI) is the dominant programming model for parallel scientific applications. As a result, the MPI library and interconnect play a significant role in the scalability. These clusters continue to scale to ever-increasing levels making the role very important. As an example, the ldquoRangerrdquo system at the Texas Advanced Computing Center (TACC) includes over 60,000 cores with nearly 4000 InfiniBand ports. Previous work has shown that memory usage simply for Connections when using the Reliable Connection (RC) transport of InfiniBand can reach hundreds of megabytes of memory per process at that level. To address these scalability problems a new InfiniBand transport, eXtended Reliable Connection, has been introduced. In this paper we describe XRC and design MPI over this new transport. We describe the variety of design choices that must be made as well as the various optimizations that XRC allows. We implement our designs and evaluate it on an InfiniBand cluster against RC-based designs. The memory scalability in terms of both Connection memory and memory efficiency for communication buffers is evaluated for all of the configurations. Connection memory scalability evaluation shows a potential 100 times improvement over a similarly configured RC-based design. Evaluation using NAMD shows a 10% performance improvement for our XRC-based prototype for the jac2000 benchmark.

Kei Ohnishi - One of the best experts on this subject based on the ideXlab platform.

  • a morphogenetic and evolutionary approach to regulating wireless access points for energy efficient and Reliable Connection services
    Congress on Evolutionary Computation, 2015
    Co-Authors: Kei Ohnishi, Kazuya Tsukamoto, Shigeru Kashihara
    Abstract:

    We propose a method for regulating wireless access points (APs) that is based on mechanisms of biological development and evolution. The purpose of the proposed regulation is to simultaneously achieve power savings in the APs and achieve Reliable Connection services through the APs better, which is shown to be a trade-off relationship in this study. The regulation target is the cycle time at which each AP enters the power-off state, which is referred to as the sleep cycle time. Biological development mechanisms form bodies of a variety of shapes using different genomes as design information, and these genomes are modified evolutionarily. Similarly, in the present study, a method inspired by biological development forms a variety of the sleep cycle times of APs, and an evolutionary method modifies the parameter values of the method inspired by the biological development in order to obtain better configurations of the APs. In addition, the regulation method is able to configure APs in a distributed manner without knowing global information; the total number of APs, their locations, or their identifiers, which is actually suitable for the situation assumed in the present study, in which APs are established and removed freely by their owners and AP users freely appear. Simulation results show that the proposed method is capable of exploring the tradeoff relationship between the amount of consumed power of the APs and the reliability of Connection services in terms of momentary achievement by regulating APs, but yields highly varying regulation results along time.

  • CEC - A morphogenetic and evolutionary approach to regulating wireless access points for energy-efficient and Reliable Connection services
    2015 IEEE Congress on Evolutionary Computation (CEC), 2015
    Co-Authors: Kei Ohnishi, Kazuya Tsukamoto, Shigeru Kashihara
    Abstract:

    We propose a method for regulating wireless access points (APs) that is based on mechanisms of biological development and evolution. The purpose of the proposed regulation is to simultaneously achieve power savings in the APs and achieve Reliable Connection services through the APs better, which is shown to be a trade-off relationship in this study. The regulation target is the cycle time at which each AP enters the power-off state, which is referred to as the sleep cycle time. Biological development mechanisms form bodies of a variety of shapes using different genomes as design information, and these genomes are modified evolutionarily. Similarly, in the present study, a method inspired by biological development forms a variety of the sleep cycle times of APs, and an evolutionary method modifies the parameter values of the method inspired by the biological development in order to obtain better configurations of the APs. In addition, the regulation method is able to configure APs in a distributed manner without knowing global information; the total number of APs, their locations, or their identifiers, which is actually suitable for the situation assumed in the present study, in which APs are established and removed freely by their owners and AP users freely appear. Simulation results show that the proposed method is capable of exploring the tradeoff relationship between the amount of consumed power of the APs and the reliability of Connection services in terms of momentary achievement by regulating APs, but yields highly varying regulation results along time.

  • SASO Workshops - Self-configuration of Wireless Access Points Based on Mechanisms of Biological Development and Evolution
    2010 Fourth IEEE International Conference on Self-Adaptive and Self-Organizing Systems Workshop, 2010
    Co-Authors: Kei Ohnishi, Kazuya Tsukamoto, Shigeru Kashihara
    Abstract:

    We propose a method for self-configuration of wireless access points (APs) that is inspired by mechanisms of biological development and evolution. The purpose of the proposed configuration is to simultaneously achieve power savings in the APs and achieve Reliable Connection services through the APs. The configuration target is the cycle time at which each AP enters the power-off state, which is referred to as the sleep cycle time. Biological development mechanisms form bodies of a variety of shapes using different genomes as design information, and these genomes are modified evolutionarily. Similarly, in the present study, a method inspired by biological development forms a variety of the sleep cycle times of APs, and an evolutionary method modifies the parameter values of the method inspired by the biological development in order to obtain better configurations of the APs. In addition, the regulation method is able to configure APs in a distributed manner without knowing global information, the total number of APs, their locations, or their identifiers, which is actually suitable for the situation assumed in the present study, in which APs are established and removed freely by their owners and AP users freely appear. Simulation results suggest that the proposed method is able to achieve power savings and Reliable Connection services under several assumptions.