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1st International Conference on Advances in P2P Systems, AP2PS 2009

作者： Zhou, Gang Yu, Jianjun National Digital Switching System Engineering and Technological Research Center 450002 France State Key Lab. of Software Development Environment Beihang University 100191 China Computer Network Information Center Chinese Academy of Sciences 100190 China

ISBN: (纸本)9780769538310

We present the design of pService system for P2P Web services discovery supporting similarity earch with its locality-preserving feature based on modified Skip Graph. In pService, the most important property (e.g. service name) of a service is viewed as the indexing key of a peer node. The other properties are extracted as multiattributes which would be mapped into one-dimensional indices using HSFC (Hilbert Space Filling Curve), and assigned to membership vector of the peer node. These two features help to support similarity search in two aspects: peer nodes with similar indexing keys would be distributed neighborly, peer nodes with similar indices will connect to each other through routing table. Our evaluation showed that the pService performs considerable Web services discovery efficiency. © 2009 IEEE.

关键词： Web services

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Study of secret sharing schemes based on quantum theory

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Tongxin Xuebao/Journal on Communications 2009年第11 A期30卷 127-132+139页

作者： Zhu, Zhen-Chao Zhang, Yu-Qing Key Lab. of Computer Networks and Information Security of Ministry of Education Xidian University Xi'an 710071 China National Computer Network Intrusion Protection Center GUCAS Beijing 100043 China

Quantum secret sharing (QSS) which is based on the laws of quantum mechanics, instead of mathematical assumptions can share the information unconditionally securely, according to the form of sharing information, quantum secret sharing can be divided into QSS of classical messages and QSS of quantum information, QSS of classical messages can be divided into QSS of classical messages based on entanglement and QSS of classical messages without entanglement, the representative protocols in three main branches of the quantum secret sharing schemes and its latest development were introduced, also prospect analysis of the schemes' future development was given.

关键词： Quantum entanglement

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Support vector machine for suppressing error method

Support vector machine for suppressing error method

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1st International Conference on information Science and Engineering, ICISE2009

作者： Lu, Shuxia Shi, Pu Chen, Ming Key Lab. of Machine Learning and Computational Intelligence College of Mathematics and Computer Science Hebei University Baoding China Baoding Pascali Cable TV Integrater Information Network Co. Ltd. Baoding China College of Mathematics and Computer Science Hebei University Baoding China

ISBN: (纸本)9780769538877

Support Vector Machine (SVM) is sensitive to noises and outliers. For reducing the effect of noises and outliers, we propose a novel SVM for suppressing error function. The error function is limited to the interval of [0, 1]. The separation hypersurface is simplified and the margin of hypersurface is widened. Experimental results show that our proposed method is able to simultaneously increase the classification efficiency and the generalization ability of the SVM.

关键词： Support vector machines

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An active defense model and framework of insider threats detection and sense

An active defense model and framework of insider threats det...

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5th International Conference on information Assurance and Security, IAS 2009

作者： Zhang, Hongbin Ma, Jianfeng Wang, Yinchuan Pei, Qingqi Ministry of Education Key Lab. of Computer Network and Information Security Xidian Univ. Xi'an 710071 China Inst. of Information Sci. and Eng. Hebei Univ. of Sci. and Tech. Shijiazhuang 050018 China Research Institute China Electronic Equipment and Systems Engineering Corporation Beijing 100141 China

ISBN: (纸本)9780769537443

Insider attacks is a well-known problem acknowledged as a threat as early as 1980s. The threat is attributed to legitimate users who take advantage of familiarity with the computational environment and abuse their privileges, can easily cause significant damage or losses. In this paper, we present an active defense model and framework of insider threat detection and sense. Firstly, we describe the hierarchical framework which deal with insider threat from several aspects, and subsequently, show a hierarchy-mapping based insider threats model, the kernel of the threats detection, sense and prediction. The experiments show that the model and framework could sense the insider threat in real-time effectively. © 2009 IEEE.

关键词： network security

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Non-blocking message total ordering protocol

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Science in China(Series F) 2008年第12期51卷 1919-1934页

作者： WANG Yun & WANG JunLing School of computer Science & Engineering, Southeast University key lab.of computer network & information integration, MOE, Nanjing 210096, China 1. School of Computer Science & Engineering Southeast University Key Lab of Computer Network & Information Integration MOE Nanjing 210096 China

Message total ordering is a critical part in active replication in order to maintain consistency among members in a fault tolerant group. The paper proposes a non-blocking message total ordering protocol （NBTOP） for distributed systems. Non-blocking property refers to that the members in a fault tolerant group keep on running independently without waiting for installing the same group view when a fault tolerant group evolves even when decision messages collide. NBTOP takes advantage of token ring as its logical control way. Members adopt re-requesting mechanism （RR） to obtain their lost decisions. Forward acknowledgement mechanism （FA） is put forth to solve decision collisions. The paper further proves that NBTOP satisfies the properties of total order, agreement, and termination. NBTOP is implemented, and its performance test is done. Comparing with the performance of Totem, the results show that NBTOP has a better total ordering delay. It manifests that non-blocking property helps to improve protocol efficiency.

关键词： total ordering protocol non-blocking active replication fault tolerance token ring

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A link analysis for passive UHF RFID system in LOS indoor environment

A link analysis for passive UHF RFID system in LOS indoor en...

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2008 International Conference on Wireless Communications, networking and Mobile Computing, WiCOM 2008

作者： Hong, Gang Wang Chang, Xing Petitioner Chang, Hua Zhu Ministry of Education Key Lab. Computer Network and Information Security Xidian University Xi'an China

ISBN: (纸本)9781424421084

A link analysis model for passive UHF RFID system in LOS indoor environment is developed and demonstrated. Using this model, the power received by tag and the read performance are investigated. The multipath fading and RMS delay spread for UHF RFID system are analyzed by a 5-ray model with different polarization, e.g., horizontal polarization, vertical polarization, and circular polarization. A practical test is developed on an indoor balcony of an office building. In addition, the electric field environment is simulated using the tool of Ansoft HFSS for the analysis of multipath degradation. The results of theoretical analysis, simulation and test are almost conformable, and the small scale fading and the field nulls are observed. Multipath degradation affects the UHF RFID system so much on read performance, and it is still a key limitation on system performance. More research on anti-multipath interference should be developed, e.g., high gain antenna, high sensitivity tag and reader receiver, and more effective protocols, and so on. © 2008 IEEE.

关键词： Time delay

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Twice-Imaging airborne camera system with distributed sensors 21

Twice-Imaging airborne camera system with distributed sensor...

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21st Congress of the International Society for Photogrammetry and Remote Sensing, ISPRS 2008

作者： Zhao, S.H. Yan, L. Duan, X.H. Wu, Y.K. Shen, T.T. Su, M.D. Beijing Key Lab. of Spatial Information Integration and its Application Peking University Beijing100871 China School of Electronics Engineering and Computer Science Peking University Beijing China

Digital airborne cameras play a significant role for aerial Photogrammetry development from analog to full-digital age. Because of the gap between digital sensor performance and Photogrammetry request, digital airborne also becomes the bottleneck of full-digital approach. In this paper, we present a design of twice-imaging airborne camera system with distributed sensors based on film camera, and carry out optical experiments to obtain practical images, MTF (Modulation Transfer Function) and the scattering light traced by ZEMAX software. © 2008 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Photogrammetry

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Autonomous distributed trust mode

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Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University 2008年第3期35卷 469-473页

作者： Zhan, Yang Pang, Liao-Jun Zhu, Xiao-Yan Wang, Yu-Min Key Lab. of Computer Network and Information Security Xidian Univ. Xi'an 710071 China State Key Lab. of Integrated Service Networks Xidian Univ. Xi'an 710071 China

To estimate the trust value in P2P networks, an autonomous trust mode based on both direct experiences and recommendations is proposed, in which the recommendation synthetic coefficients are decided by the trustor's trust on the recommendation subscribers. Both the direct trust and the recommendation trust are attenuated with time intervals. The corresponding data structure and an iterative computational method are given.

关键词： Peer to peer networks

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Attack-tolerant node localization in wireless sensor networks

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology 2008年第7期30卷 111-115页

作者： Ye, A-Yong Ma, Jian-Feng Key Lab. of the Ministry of Education for Computer Networks and Information Security Xidian University Xi'an 710071 China Key Lab. of the Network Security and Cryptology Fujian Normal University Fuzhou 350007 China

It is essential to ensure that sensors can determine their location for wireless sensor networks. However, most of existing location discovery protocols became vulnerable in the presence of malicious attacks. So the authors presented an attack-tolerant node localization algorithm called AtLoc. In AtLoc, a least safe reference set was randomly built up according to the unbiased estimation of variance. Based on this, prediction residual of the least safe reference set was used to stepwise diagnose the remained references were abnormal or not, which significantly enhanced the resilience of localization system against attacks. Finally, the authors provided theoretical analysis and simulations to evaluate the proposed techniques.

关键词： Node localization Security Wireless sensor networks

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Adaptive genetic algorithm and its application to multi-literal multi-issue competitive e-commerce

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Dianzi Yu Xinxi Xuebao/Journal of Electronics and information Technology 2008年第11期30卷 2613-2616页

作者： Li, Jian Jing, Bo Yang, Yi-Xian Information Security Center State Key Lab. of Network and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Dept. of Computer Technology Beijing Institute of Applied Meteorology Beijing 100029 China

To make the agents negotiate more efficiently in multi-lateral multi-issue negotiation in multi-agent based competitive e-commerce, an agent negotiation model in competitive environment is presented, and the Adaptive Genetic Algorithm (AGA) is applied to the model to enhance the negotiation efficiency. In the experiments, two kinds of genetic algorithms are used to compare with, they are Standard Genetic Algorithm (SGA) and AGA. After 1000 times of experiments for the two kinds of agents to gain the satisfying result, SGA averagely needs negotiation of 183 runs, while the AGA averagely needs only 152 runs. The experiment results show that the AGA can gain the satisfying negotiation result more efficiently than SGA in competitive multi-lateral multi-issue negotiation.

关键词： Electronic commerce

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