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Traffic Engineering for Proactive failure recovery of IP Networks

Tsinghua Science and Technology 2011年第1期16卷 55-61页

作者：张民贵刘斌 Department of Computer Science and Technology Tsinghua University

As a promising approach to improve network reliability, proactive failure recovery （PFR） re-routes failure affected traffic to backup paths without waiting for the completion of IP routing convergence. However the failure affected traffic may cause congestion if it is not carefully allocated over the backup paths according to their available capacity. A post failure traffic engineering （PostTE） scheme is proposed to balance the load in the PFR scheme. Loop-free backup paths are prepared in advance to cover all the potential single-link failures. The failure affected load is locally allocated to the backup paths through solving a linear programming （LP） problem. Most of the time, the maximum link utilization （MLU） of the network is minimized under both the failure and failure-free cases. For the tested education networks, the LP problem can be solved within milliseconds.

关键词： routing failure recovery traffic engineering linear programming

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Fault Tolerance and recovery for Group Communication Services in Distributed Networks

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Journal of Computer Science & Technology 2012年第2期27卷 298-312页

作者：王跃华周忠 Ling Liu 吴威 State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China School of Computer Science and Engineering Beihang UniversityBeijing 100191China College of Computing Georgia Institute of TechnologyAtlanta 30332U.S.A.

Group communication services （GCSs） are becoming increasingly important as a wide field of promising applications has emerged to serve millions of users distributed across the ***,it is challenging to make the service fault tolerance and scalable to fulfill the voluminous demand of users in a distributed network （DN）.While many reliable group communication protocols have been dedicated to addressing such a challenge so as to accommodate the changes in the network,they are often costly or require complicated strategies to handle the service interruptions caused by node departures or link failures,which hinders the service *** this paper,we present two schemes to address the *** first one is a location-aware replication scheme called NS,which makes replicas in a dispersed fashion that enables the services on nodes to gain immunity of failures with different patterns （e.g.,network partition and single point failure） while keeping replication overhead *** second one is a novel failure recovery scheme that exploits the independence between service recovery and structure recovery in time domain to achieve quick failure *** simulation results indicate that the two proposed schemes outperform the existing schemes and simple alternative schemes in service success rate,recovery latency,and communication cost.

关键词： fault tolerance failure recovery replication location group communication

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An Efficient Connectivity Restoration Technique(ECRT)for Wireless Sensor Network

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Computers, Materials & Continua 2021年第10期69卷 1003-1019页

作者： Mahmood ul Hassan Shahzad Ali Khalid Mahmood Muhammad Kashif Saeed Amin Al-Awady Kamran Javed Ansar Munir Shah Department of Computer Skills Preparatory yearNajran UniversityNajran66241Saudi Arabia Department of Computer Science Jouf UniversityTubarjal74769Saudi Arabia Department of Information Systems College of Science and ArtsKing Khalid UniversityMahayil Asir63317Saudi Arabia Department of Computer Science Community College Mahayil AsirKing Khalid UniversityMahayil63718Saudi Arabia Department of Computer Engineering National University of Technology(NUTECH)Islamabad44000Pakistan Department of Computer Science Institute of Southern PunjabMultan60000Pakistan

Node failure in Wireless Sensor Networks(WSNs)is a fundamental problem because WSNs operate in hostile *** failure of nodes leads to network partitioning that may compromise the basic operation of the sensor *** deal with such situations,a rapid recovery mechanism is required for restoring inter-node *** to the immense importance and need for a recovery mechanism,several different approaches are proposed in the ***,the proposed approaches have shortcomings because they do not focus on energy-efficient operation and coverage-aware mechanisms while performing connectivity ***,most of these approaches rely on the excessive mobility of nodes for restoration connectivity that affects both coverage and energy *** paper proposes a novel technique called ECRT(Efficient Connectivity Restoration Technique).This technique is capable of restoring connectivity due to single and multiple node *** achieves energy efficiency by transmitting a minimal number of control *** is also coverage-aware as it relocates minimal nodes while trying to restore *** the help of extensive simulations,it is proven that ECRT is effective in connectivity restoration for single and multiple node *** also show that ECRT exchanges a much smaller number of packets than other ***,it also yields the least reduction in field coverage,proving its versatility for connectivity restoration.

关键词： Cut-vertex failure recovery network connectivity node relocation wireless sensor network node failures

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Dynamically reconfigurable radio-over-fiber network with medium access control protocol to provide network access to train passengers

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Science China(Information Sciences) 2013年第10期56卷 134-143页

作者： SHEN Xi XU Kun SUN XiaoQiang WU Jian LIN JinTong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

An innovative dynamically reconfgurable radio-over-fber(RoF)network equipped with an intelligent medium access control(MAC)protocol is proposed to provide broadband access to train passengers in railway high-speed mobile *** proposed RoF network architecture is based on a reconfgurable control station and remote access unit(RAU)that is equipped with a fxed flter and tunable *** proposed hybrid frequency-division multiplexing/time division multiple access(FDM/TDMA)based MAC protocol realizes failure detection/recovery and dynamic wavelength allocation to remote access *** result shows that with the proposed MAC protocol,the control station can detect failures and recover and dynamic wavelength allocation can increase the wavelength resource utilization to maintain network performance.

关键词： radio over fber medium access control protocol wavelength allocation failure detection failure recovery

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The Study on Main Problems in Visual Fox Pro On-line Test System

The Study on Main Problems in Visual Fox Pro On-line Test Sy...

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2011 International Conference of Environmental Science and Engineering（ICESE 2011）

作者： Yanrong Dong Liyong Xu Ji Zhang Department of Computer Science He Bei Normal University of Science Technology

This thesis takes Visual Fox Pro as an example, based on the platform of ***+SQL Server, analyses the main problems in on-line test, such as the tactics of composing test papers, the tactics of scoring, failure recove... 详细信息

关键词： composing test papers failure recovery timing the test intelligent scoring

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并行数据库结点故障的处理机制

并行数据库结点故障的处理机制

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第十七届全国数据库学术会议

作者：蒋跃龙陈红周庆庆王珊中国人民大学数据与知识工程研究所

1.引言并行数据库作为大型数据处理的理想平台之一,不仅在性能上高于一般数据库,在稳定性和安全性方面也应具有更好的表现。其中一个现实需求为:当Shared-Nothing体系结构下一个结点出现严重问题时(如介质故障),其它节点能否在经过短时... 详细信息

1.引言并行数据库作为大型数据处理的理想平台之一,不仅在性能上高于一般数据库,在稳定性和安全性方面也应具有更好的表现。其中一个现实需求为:当Shared-Nothing体系结构下一个结点出现严重问题时(如介质故障),其它节点能否在经过短时间的调整后继续正常运行。

关键词： failure recovery Data replication Load balance

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