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International Conference on Power System technology (POWERCON)

作者： Mingde Cui Lianguang Liu Zhongming Sun Key Laboratory of Power System Protection andDynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Beijing Wanglian HVDC Engineering Technology Company Limited Beijing China

Grounding characteristics of linear, star-type and toroidal electrodes are discussed in this paper. Based on the analysis of the performance of double-ring in uniform and horizontal two-layer soils, an electrode model of standard triple concentric rings buried with different depth is presented for plusmn800 kV Xiluodu and Xiangjiaba converter stations in the first period of Jinsha River DC projects. Considering the three sending converter stations in the projects close to each other relatively, an initial analysis of sharing electrodes has been made, including the operation mode of converter stations, choice of rated current and the design model of electrodes. Simulation results obtained from the electrode sites primarily selected for Xiluodu right-bank converter station show that the above model can satisfy the operation requirements with a better economical performance and sharing electrodes by multi-converter stations is also feasible. They may supply some reference to the practical projects.

关键词： Earth Electrodes Grounding Rivers Soil Control systems Sun Hydroelectric power generation Geology Performance analysis

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Disaster recovery system model with e-government case study

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Natural Hazards Review 2006年第4期7卷 145-149页

作者： Wang, Kun Li, Long-Hai Yuan, Feng Zhou, Li-Hua Key Laboratory of Computer Network and Information Security Xidian Univ. Ministry of Education Xi'an 710071 Shaanxi China Dept. of Computer Science and Technology Xidian Univ. Xi'an 710071 Shaanxi China National Information Security Engineering and Technology Research Center Beijing 100093 China

We present a robust disaster recovery system model according to the requests of disaster recovery talent of a key e-government project of China. The model strengthens the safe communication ability and guarantees the secure command on disaster recovery. It introduces a self-supervision power to watch the integrality and security of the disaster recovery system itself. It makes the use, management, and maintenance of the disaster recovery system much easier through the real-time visible platform. This model suits security-critical environments for owning the features of security, robustness, and controllability. It has guided the construction of an e-government disaster recovery system of China. © 2006 ASCE.

关键词： Disaster prevention

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Certificateless Convertible Limited Verifier Signature Scheme

Certificateless Convertible Limited Verifier Signature Schem...

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IEEE Region 10 International Conference TENCON

作者： Chenhuang Wu Zhenjie Huang Department of Computer Science and Engineering Zhangzhou Normal University Fujian China Department of Computer Science and Engineering Shanghai JiaoTong University Shanghai China State Key Laboratory of Information Security Institute of Software of Chinese Academy of Sciences Beijing China

Certificateless public key cryptography (CL-PKC) as a new paradigm was introduced by Al-Riyami and Paterson in Asiacrypt 2003, which removes the use of certificate to ensure the authenticity of the user's public key in the traditional certificate-based public key cryptography and also overcomes the key escrow problem in the identity-based public key cryptography. Motivated by the conflict between authenticity and privacy in the digital signature, the notion of limited verifier signature was introduced by Araki et al.. In this paper, to the best of our knowledge, we give the first precise definition and security notions for certificateless convertible limited verifier signature and then the first concrete signature scheme which is provably secure under the CDH assumption. We also extend our signature scheme into a certificateless convertible two limited verifiers scheme for certain applications at the end of this paper

关键词： Public key cryptography Public key Digital signatures Computer science Privacy Concrete Identity-based encryption Laboratories Information security Certification

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A Simulink-to-FPGA Co-Design of Encryption Module

A Simulink-to-FPGA Co-Design of Encryption Module

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： Xiaoying Li Fuming Sun Enhua Wu Department of Computer and Information Science FST University of Macau Macao China School of Information Engineering University of Science and Technology Beijing China State Key Laboratory of Computer Science Institute of Software Chinese Academy and Sciences Beijing China

In this paper, circuit design of an arithmetic module applied to cryptography - modulo multiplicative inverse is presented and implemented using FPGA hardware technology. This modular arithmetic function contains iterative computations of division, multiplication and accumulation with variable loop times. Besides standard HDL programming and schematic input, Simulink-to-FPGA has been tried as a different design flow. Experimental results are compared between different design methods with discussion of their pros and cons

关键词： Cryptography Circuit synthesis Field programmable gate arrays Mathematical model Hardware design languages Digital signal processing Arithmetic Design methodology Flowcharts Delay

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Data Distribution Algorithm of High-Speed Intrusion Detection system Based on Network Processor

Data Distribution Algorithm of High-Speed Intrusion Detectio...

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International Conference on Semantics, Knowledge and Grid (SKG)

作者： Cheng Xu Cheng Xu Fei Yu Fei Yu Zhenghui Dai Zhenghui Dai Guangxue Yue Guangxue Yue Renfa Li Renfa Li Provincial Key Laboratory of Computer Information Processing Technology Suzhou Jiangsu China State Key Laboratory of Information Security Graduate School of Chinese Academy of Sciences Beijing China School of Computer & Communication Hunan University Changsha China College of Informationg Engineering JiaXing University China

Because the processing speed of intrusion detection system can hardly keep pace with the high-speed development of network, improving the speed of intrusion detection has been the problem starved for solve. By adopting the network processor, a distribution algorithm based on protocol analysis has been realized. By delivering the captured data package to each detect node according to protocol types and then accomplishing the detection for data package through the collaboration of the detect nodes, the processing efficiency of the intrusion detection system has been improved as a whole.

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Polar LEO satellite constellation measurement by delay probing

Polar LEO satellite constellation measurement by delay probi...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Junfeng Wang Hongxia Zhou Fanjiang Xu Mingtian Zhou College of Computer Science and Engineering University of Electronic Science and Technology ChengDu China National Key Laboratory of Integrated Information System Technology Institute of Software Chinese Academy and Sciences Beijing China Chongqing Communication College Chongqing China

Low Earth orbit (LEO) satellite networks are capable of providing wireless connectivity seamlessly and continuously to any part of the world with guaranteed short round-trip propagation delay. As a key part of next generation network (NGN) infrastructure, next generation satellite networks are expected to support a variety of applications with diverse performance requirements. This paper argues that the constellation tomography for the LEO satellite network is a preliminary step for efficient satellite network monitoring and performance promotion. To measure the constellation, a divide-and-conquer mechanism is developed for each parameter estimation by delay probing. The delay measurement is only carried out between two terminals located at the same geographic positions. Performance evaluation on several popular polar LEO constellations proves the accuracy and efficiency of the developed constellation tomography algorithms in divide-and-conquer manner. The geographic position limitation of the delay probing terminals for valid constellation inference is also analyzed in the paper

关键词： Low earth orbit satellites Satellite constellations Extraterrestrial measurements Next generation networking Tomography Propagation delay Monitoring Parameter estimation Delay estimation Position measurement

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Topological dynamics characterization for layered satellite networks

Topological dynamics characterization for layered satellite ...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Junfeng Wang Yuemei Hu Hongxia Zhou Mingtian Zhou College of Computer Science and Engineering University of Electronic Science and Technology ChengDu China National Key Laboratory of Integrated Information System Technology Institute of Software Chinese Academy and Sciences Beijing China Chongqing Communication College Chongqing China

The highly topological dynamics characterize the most fundamental property of satellite networks contrary to the terrestrial networks. This manifest feature directs the researches on various aspects of satellite networks, including routing and switching architecture selection, routing protocol and reliable transmission control protocol design and enhancement, etc,. The paper quantifies the dynamical activates of layered satellite network topologies. The number and length of network snapshots of one-layered satellite constellations are formulated concisely. The snapshot distributions of typical multi-layered constellations are also evaluated. With this work, it compensates for the simplified topological assumptions in many satellite network related investigations. The thorough understanding of this basic feature not only provides for an accurate quantification of network behavior, but also guides constellation design for future satellite networks

关键词： Low earth orbit satellites Satellite broadcasting Satellite constellations Routing protocols Network topology Next generation networking Quality of service Laboratories Information systems Communication system software

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Framework for supporting extended transaction models in J2EE platform

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Jisuanji Yanjiu yu Fazhan/Computer Research and Development 2006年第7期43卷 1273-1279页

作者： Zhang, Xin Ding, Xiaoning Jin, Beihong Li, Jing Technology Center of Software Engineering Institute of Software Chinese Academy of Sciences Beijing 100080 China Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 China

As for the development of the Internet applications and distributed computing, the need for supporting these distributed, collaborative, loosely coupled and complex applications emerges. Although powerful, the flat model is found lacking functionality and efficiency when used for these new applications. Aiming at getting more flexible models, various extensions to the traditional transaction model have been proposed. However, these researches focus on relaxing the constraints of ACID properties and increasing the concurrency and flexibility in specific environments, and the restriction of data source interfaces leads to the difficulties in implementing the extended transaction primitives. A novel framework for supporting extended transaction models in the J2EE platform is presented by enforcing the transaction manager to control the concurrency. In this way, the transaction manager holds a full control of access from applications to data sources, and thus gives supports for common extended transaction models.

关键词： Middleware

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Worthy-of-note option for urban natural gas consumption-dual source heating/air conditioning system

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2006年第2期27卷 181-184页

作者： Song, Zhi-Ping Beijing Key Laboratory of Security and Clean Energy Technology Department of Thermal Power Engineering North China Electric Power University Beijing 102206 China

Dual Source Heating (Air Conditioning) System is a system proposed in patent 00100102.7. A full exposition of its performance is presented in this paper. It is found that in comparison with conventional system it consumes far less fossil fuel. Against the electrically driven heat pump, it provides a more reliable operation. Unlike CHP (Combined Heat and Power), the problem of interconnection with public power grid does not exist. In addition, to meet a specified heat load, the amount of natural gas needed to feed the system is remarkably reduced than that needed for cogeneration system. This is important because in China natural gas is relatively scarce and the peak demand appears normally in heating seasons.

关键词： Air conditioning Decentralized energy Energy conservation Environment protection Heating Natural gas

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Research on User Authentication for Grid Computing security

Research on User Authentication for Grid Computing Security

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International Conference on Semantics, Knowledge and Grid (SKG)

作者： Ronghui Wu Ronghui Wu Renfa Li Renfa Li Fei Yu Fei Yu Guangxue Yue Guangxue Yue Cheng Xu Cheng Xu State Key Laboratory of Information Security Graduate School of Chinese Academy of Sciences Beijing China School of Computer & Communication Hunan University Changsha China Provincial Key Laboratory of Computer Information Processing Technology Suzhou University Suzhou Jiangsu Province China College of Informationg Engineering JiaXing University JiaXing China

Recently, Authentication protocol has been recognized as an important factor for grid computing security. This paper described a new simple and efficient Grid authentication system providing user anonymity. Our system is based on hash function, and mobile users only do symmetric encryption and decryption. In our system, it takes only one round of messages exchange between the mobile user and the visited network, and one round of message exchange between the visited network and the corresponding home network. The proposed architecture possesses several desirable emerging properties that enable it to provide an improved level of security for grid computing systems..

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