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International Conference on computer Science and information Technology (CSIT)

作者： Henriques Marcelino Zeng Hua-shen Guan Yanbin Computer & Information School Si Chuan Network Communication Technology Key Laboratory Southwest Jiaotong University Chengdu China

Although many researchers have written about OFDMA transmission system, it needs more attention and analysis in next generation wireless networks. This paper is aimed at studying the performance analysis of OFDMA in WiMAX IEEE 802.16m and 3GPP LTE Advanced systems Communication in hybrid environment systems. This study further focuses on Downlink and Uplink models. Finally, it summarizes simulation results of OFDMA transmission technique.

关键词： Downlink MIMO WiMAX Modulation Frequency division multiaccess OFDM Bandwidth

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Schedulability analysis for real-time messages over switched Ethernet with EDF scheduling

Schedulability analysis for real-time messages over switched...

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International Conference on information Science and Engineering (ICISE)

作者： Ming Tan Zhen Wei Key Laboratory of Network and Intelligent Information Processing Hefei University Hefei China School of Computer and Information Hefei University of Technology Hefei China

To overcome the drawback that switched Ethernet can not meet the real-time requirements in industrial communications, an improved message transmission model in which switch and the end-nodes control the real-time traffic with Earliest Deadline First (EDF) scheduling was proposed. In addition, a distributed admission control method for periodic messages which is performed by the source and the destination nodes without the modification of the operational features of Ethernet switch was presented. Moreover, a more general schedulability condition for real-time periodic message over switched Ethernet was given and proved by using real-time scheduling theory.

关键词： Switches Real time systems Ethernet networks Scheduling algorithm Job shop scheduling Admission control Synchronization

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Integrity Measurement Model Based on Trusted Virtual Platform

Integrity Measurement Model Based on Trusted Virtual Platfor...

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International Conference on Genetic and Evolutionary Computing (ICGEC)

作者： Gang Qiu Yulei Wang Lihua Zhou Ministry of Education Key Laboratory of Computer Network & Information Security Xidian University Xi'an China Network Information Center Nanyang Institute of Technology Nanyang China School of Computer Science and Technology Xidian University Xi'an China

A secure and trusted execution environment is a fundamental requirement for distributed network, so that the integrity of service provider platform should be verified prior to services' distribution in order to assure that the platform is free from a malicious modification and attack. In this paper, we proposed an implementation of trusted execution environment based on the combination of trusted computing and virtualization technology. On the service provider's platform, from the very beginning of Virtual Machine Monitor (VMM) was booted to the execution environment was set up, all of the platform status changes has been recorded into Platform Configuration Register (PCR) and reported to remote service requester, which make it sure about the trustworthy of the result. Furthermore, the VM image was leveraged to make the execution environment constructed more flexible. Analysis shows our method is efficient and secure.

关键词： Security Virtual machining computer architecture Presses Hardware Virtual machine monitors Kernel

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Effects of Image Lossy Compression on Palmprint Verification Performance

Effects of Image Lossy Compression on Palmprint Verification...

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2010 IEEE International Conference on information Theory and information Security(2010 IEEE 国际信息论与信息安全会议)

作者： Jizhi Wang Hengjian Li Yinglong Wang Jiashu Zhang Shandong Provincial Key Laboratory of computer Network Shandong Computer Science Center Jinan China Sichuan Province Key Lab of Signal & Information Processing Southwest Jiaotong University Chengdu

In this paper, we investigate the effects that the lossy image compression has on the performance competitive codes of palmprint verification algorithms. Effects of lossy compression on palmprint recognition performance are of interest in applications where image storage space and transmission time are of critical importance. To reconcile that goal with its implications for bandwidth and storage, we test the effects of image lossy compression on competitive code under different transforms, quantization and encoding algorithms using a publicly available palmprint database. Experiments performing recognition directly in the compressed domain show that the extracted feature template variation from the compressed palmprint image is not consistent with the image distortion. What is interesting, the effect on the JPEG is more serious than that of JPEG2000 when the compression ratio is bigger than about 11 while the effect on JPEG2000 is more serious than that of JPEG when the compression ratio is smaller than about 11. And the trellis coded quantized method is not suitable for compressing palmprint images.

关键词： Image coding Transform coding Image recognition PSNR Classification algorithms Transforms Face recognition

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An Authenticated Dynamic key Management Scheme for Clustered Sensor networks

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China Communications 2010年第4期7卷 7-17页

作者： ZHOU Yajian PAN Anwei LI Jiguo Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China College of Computer ＆ Information Engineering Hohai University Nanjing 210098 China

Secure sensor networks has received much attention in the last few years.A sensor network always works unattended possibly in a hostile environment such as a *** such environments,sensor networks are subject to node *** energy,memory,and computational capabilities of sensor nodes mandate a clever design of security solutions to minimize overhead while maintaining secure communication over the lifespan of the *** this paper,an authenticated dynamic key management scheme,ADKM has been *** provides efficient,scalable,and survivable dynamic keying in a clustered sensor network with a large number of sensor *** employs a combinatorial exclusion basis system (EBS) for efficiency and one-way hash chains for *** of security and performance demonstrate that ADKM is efficient in security of sensor networks.

关键词： Wireless Sensor networks key Management Exclusion Basis Systems One-way Hash Chain

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News filtering and summarization on the Web

News filtering and summarization on the Web

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作者： Wu, Xindong Wu, Gong-Qing Xie, Fei Zhu, Zhu Hu, Xue-Gang Lu, Hao Li, Huiqian School of Computer Science and Information Engineering Hefei University of Technology China Zhejiang Taobao Network China Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences China Center for Social Computing and Parallel Systems Institute of Automation Chinese Academy of Sciences China

The news filtering and summarization (NFAS) system can automatically recognize Web news pages, retrieve each news page's title and news content, and extract key phrases. This extraction method substantially outper...

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Constructions of Maiorana-McFarland's Bent Functions of Prescribed Degree

Constructions of Maiorana-McFarland's Bent Functions of Pres...

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International Conference on Computational Intelligence and Security

作者： Feng-rong Zhang Yu-pu Hu Hua Ma Min Xie Key laboratory of computer network and information security Ministry of Education Xidian University Xi'an China School of science Xidian University Xi'an China

A Boolean function with an even number n = 2k of variables is called Bent if it is maximally nonlinear. A technique on constructing Maiorana-McFarland's Bent functions of arbitrary degree is described. Based on the properties of Maiorana-McFarland's Bent functions, a Bent function with arbitrary degree can be constructed by changing the order of concatenating linear functions.

关键词： Boolean functions Cryptography Polynomials Correlation computer science Encoding Hamming weight

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Bundle transport model of satellite delay tolerant networks

Bundle transport model of satellite delay tolerant networks

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International Conference on Future computer and Communication, ICFCC

作者： Haizheng Yu Jianfeng Ma Hong Bian Key Laboratory of Computer Network and Information Security Xidian University Xi'an China School of Mathematical Sciences Xinjiang Normal University Urumqi China

ISBN: (纸本)9781424458219;9781424458240

The data is transmitted between a small satellite near earth and the ground stations. For transmitting reliably, the data is divided into many fragments, and these fragments are encapsulated as multiple bundles with the bundle protocol of Delay/Disruption Tolerant networks (DTNs). Some bundles which may be error are requested to retransmit in next communication link. An r-uniform random hypergraph model is introduced and the relation is analyzed between the probability of error bundle and the structure of hypergraph.

关键词： Disruption tolerant networking Satellite ground stations Space technology computer network reliability Error correction Laboratories information security Ad hoc networks Transport protocols Random number generation

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RETRACTED ARTICLE: Reliability-based CBM system design for feed water pump

RETRACTED ARTICLE: Reliability-based CBM system design for f...

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作者： Qin, Jinlei Niu, Yuguang Li, Zheng Information and Network Management Center North China Electric Power University Baoding China Key Laboratory of Condition Monitoring and Control for Power Plant Equipment Ministry of Education North China Electric Power University Beijing China Department of Computer Science and Technology North China Electric Power University Beijing China

ISBN: (纸本)9781424455386

The condition-based maintenance (CBM) technique has been widely used in the power plant in China. Feed water pump is one of the most important general requirements in the power plant. its reliability plays an important part in the safety of the complete running. On the basis of practical situation in one power plant, a system for condition-based maintenance of the feed water pump in said power plant has been designed. Taking the reliability as the center, and based on failure mode and effects analysis (FMEA) maintenance scheme can be made and initiative maintenance can be carried out. Practical operation shows that the said system can fully enhance the reliability of equipment, ensuring the safe operation of generating units to improve the economic benefits of power plants. © 2010 IEEE.

关键词： Outages

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Improving Efficiency of Security Schemes in Automated Trust Negotiation

Improving Efficiency of Security Schemes in Automated Trust ...

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International Workshop on Education Technology and computer Science, ETCS

作者： Bailing Liu Hongwei Lu Yizhu Zhao Feng Ge College of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Key Laboratory of Information Network Security Ministry of Public Security Shanghai China

ISBN: (纸本)9781424463886;9780769539874

Automated trust negotiation (ATN) is an approach that establishes mutual trust between strangers wishing to share resources or conduct business by gradually requesting and disclosing digitally signed credentials. When designing security schemes and systems in ATN, the negotiation efficiency, which is a desirable property, is not considered sufficiently. In this paper, a useful model of P. E. evaluation is proposed to enhance negotiation efficiency by improving the efficiency of security schemes used in ATN. The useful model of P. E. evaluation is responsible for choosing a most appropriate policy among several alternative policies that can advance a negotiation at the same time, which makes the negotiation more efficient.

关键词： information security Cryptography Educational technology computer security computer science Protection computer science education Educational institutions Access control Automatic control

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