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International Conference on Wireless Communications, networking and Mobile Computing (WiCom)

作者： Ning Zhang Saisai Ma Jing Xu Bin Zhou Wei Zou Chinese Academy of Sciences Key Laboratory of Wireless Sensor Network & Communication Shanghai China College of Computer and Information Engineering Hohai University Nanjing China Renesas Mobile Corporation Shanghai China

Cellular systems operate on ISM band with the co-existence of wide-deployed WLAN is a promising solution to offload the crowded cellular band, where cellular device acting as virtual a WLAN station contends for WLAN channel resource via applying the same IEEE 802.11 Distributed Coordination Function(DCF) as WLAN rivals is a straightforward way. However, the conventional mechanism cannot fully utilize the spectrum resource, we propose an adaptive probability access (APA) method which could adjust the channel access probability of cellular system by maximizing the proportional fairness throughput of both systems. This method can adjust the cellular access probability step by step to ensure that both cellular and WLAN work near the optimum operating spot. Simulation results show that the proposed APA method improves both the proportional fairness and total throughput.

关键词： Wireless LAN Throughput Simulation Multiaccess communication IEEE 802.11 Standards Wireless communication Adaptive systems

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Identity-based proxy cryptosystems with revocability and hierarchical confidentialities

Identity-based proxy cryptosystems with revocability and hie...

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作者： Wang, Lihua Wang, Licheng Mambo, Masahiro Okamoto, Eiji Network Security Research Institute Koganei-shi 184-8795 Japan State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Faculty of Electrical and Computer Engineering Institute of Science and Engineering Kanazawa University Kanazawa-shi 920-1192 Japan School of Systems and Information Engineering University of Tsukuba Tsukuba-shi 305-8573 Japan

Proxy cryptosystems are classified into proxy decryption systems and proxy re-encryption systems on the basis of a proxy's role. In this paper, we propose an ID-based proxy cryptosystem with revocability and hierarchical confidentialities. In our scheme, on receiving a ciphertext, the proxy has the rights to perform the following three tasks according to the message confidentiality levels of the sender's intention: (1) to decrypt the ciphertext on behalf of the original decryptor;(2) to re-encrypt the ciphertext such that another user who is designated by the original decryptor can learn the message;(3) to do nothing except for forwarding the ciphertext to the original decryptor. Our scheme supports revocability in the sense that it allows proxy's decryption and re-encryption rights to be revoked even during the valid period of the proxy key without changing the original decryptor's public information. We prove that our proposal is indistinguishable against chosen identity and plaintext attacks in the standard model. We also show how to convert it into a system against chosen identity and ciphertext attacks by using the Fujisaki-Okamoto transformation. © 2012 The Institute of Electronics, information and Communication Engineers.

关键词： Cryptography

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RFID-based electronic identity security cloud platform in cyberspace

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Journal of networks 2012年第7期7卷 1131-1138页

作者： Chen, Bing Tan, Chengxiang Jin, Bo Zou, Xiang Dai, Yuebo The 3rd research institute of ministry of public security Shanghai China Key laboratory of information network security Ministry of Public Security Shanghai China Dept. of computer science and engineering Tongji University Shanghai China

With the moving development of networks, especially Internet of Things, electronic identity administration in cyberspace is becoming more and more important. And personal identity management in cyberspace associated with individuals in reality has been one significant and urgent task for the further development of information construction in China. So this paper presents a RFID-based electronic identity security cloud platform in cyberspace to implement an efficient security management of cyber personal identity, and designs and realizes a strong and pervasive security cloud service platform, and discusses key technology including security authentication mechanism for the electronic identity card, super high frequency RFID with eID cards, multilevel privacy protection mechanism, security cloud service, security isolation and single-oriented transmission, and boundary security gateway protection, and it can well apply to personal identity management with virtual roles of citizens in cyberspace such as E-Government and E-Business, and the electronic identity security platform has been primary implemented and achieved good effects in actual applications. © 2012 ACADEMY PUBLISHER.

关键词： Distributed database systems

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The analysis to gamma oscillations induced in high dose DHPG and spike-gamma oscillation relationship

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International Journal of Advancements in Computing Technology 2012年第20期4卷 553-560页

作者： Wen, Dong Lu, Chengbiao Key Laboratory for Computer Virtual Technology and System Integration of HeBei Province Yanshan University QinhuangdaoHebei 066004 China School of Information Science and Engineering Yanshan University QinhuangdaoHebei 066004 China Institue of Electrical Engineering Yanshan University Qinhuangdao Hebei 066004 China

Neuronal oscillations in the gamma frequency range and spikes have been reported in many cortical areas in the information processing, but the role of spikes play in cortical processing remains unclear. The aim of this study was to examine the role of high dose DHPG in the generation of oscillatory field activity at gamma frequency in the medical septal diagonal band of Broca (MSDB) slice prepared from rat brain, and to determine the phase relationship between spikes and gamma oscillations. The high dose DHPG induced large amplitude field population spiking activity, which is correlated linearly with the field gamma oscillations. The relationship between timing of spikes and the phase of gamma oscillation was determined by an analysis of circular statistics. Further analysis with Rayleigh test revealed that the relationship of phase-locking between spikes and gamma rhythm is of statistical significance. These data demonstrate that DHPG-sensitive neuronal networks within medial septum are able to generate gamma oscillations which are modulated by large amplitude population spikes and phase-locking of spikes to the gamma rhythm suggest the role of memory enhancement in the presence of mGluR1 activation.

关键词： Locks (fasteners)

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Zhao Wei Chunhe Xia Qing Wei Shan Yao Yujian Zhou State Key Laboratory of Virtual Reality Technology and System Key Laboratory of Beijing Network Technology School of Computer Science and Engineering Beihang University Beijing China Information Center of Ministry of Science and Technology The Ministry of Science and Technology of the Peoples Republic of China Beijing China

The transformation from high-level model description to low-level implementation for network survivability may lead to semantic inconsistency problem, since the method of transformation is based on symbolic transformation of machine which neglects semantics of proposed problem. Therefore, in order to analyze the semantic differences of transformation before and after and ensure the semantic consistency, this paper built an Ontology model of high-level model description and low-level implementation for network survivability. We proposed an Ontology-based multi-factor synthesized method which is used to analyze semantic similarity of multi-hierarchy text including high-level model description text and low-level implementation text. This method included the computation of type similarity of the text based on concept lattice, computation of content similarity of the text based on ontology and computation of structure similarity of the text based on inverse order pairs. The availability of the method is verified by experiments and its accuracy is proved by comparison with classic VSM algorithm, WeiSong algorithm, CF algorithm and professional value.

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High Capacity Steganographic Method Based upon Quantization Error of JPEG

High Capacity Steganographic Method Based upon Quantization ...

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2012年计算机应用与系统建模国际会议

作者： Dong Xiuze Liu Shu Zhang Ru Niu Xinxin Wang Lifeng Information Security Center Beijing University of Posts and Telecommunications Electronic and Information Engineering Department Beijing Electronic Science and Technology Institute Key Laboratory of Information Network Security Ministry of Public Security Computer Science and Technology Department Beijing Electronic Science and Technology Institute

Quantizing Error during the process of JPEG compression is analyzed, and a new information hiding algorithm is proposed based on Quantizing Error of JPEG image. Experimental results show that the proposed algorithm can provide a high capacity information hiding and keep the visual quality well, also the produced stego-image are almost identical to the original cover images.

关键词： Quantization Error, Steganography, Cover-Image, Stego-Image

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Sentence alignment for web page text based on vector space model

Sentence alignment for web page text based on vector space m...

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International Conference on computer Science and information Processing (CSIP)

作者： GuanHong Zhang Odbal Department of Computer science and technology Key Laboratory of Network and Intelligent Information Processing Hefei University Hefei Anhui China Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei Anhui China

There exist noisy, unparallel sentences in parallel web pages. Web page structure is subjected to some limitation for sentences alignment task for web page text. The most straightforward way of aligning sentences is using a translation lexicon. However, a major obstacle to this approach is the lack of dictionary for training. This paper presents a method for automatically align Mongolian-Chinese parallel text on the Web via vector space model. Vector space model is an algebraic model for representing any object as vectors of identifiers, such as index terms. In the statistically based vector-space model, a sentence is conceptually represented by a vector of keywords extracted from the text. Extracted keywords are composed by content words, known as terms and the weight of a term in a sentence vector can be determined tf-idf method. CHI is used to compute the association between bilingual words. Once the term weights are determined, the similarity between sentence vectors is computed via cosine measure. The experimental results indicate that the method is accurate and efficient enough to apply without human intervention.

关键词： Manganese HTML

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An efficient coverage control algorithm for three-dimensional underwater sensor networks

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Advances in information Sciences and Service Sciences 2012年第10期4卷 393-399页

作者： Xiao, Fu Yang, Yang Sun, Li Wang, Ruchuan Nanjing University of Posts and Telecommunications Nanjing 210003 China Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China

Strategy of sensor nodes deployment is directly related to the cost and performance for underwater wireless sensor networks, which is largely determined the various service-quality improvement of wireless sensor networks. In order to improve the coverage of the target area, this paper presents a distributed algorithm of coverage control. Assume that nodes initially deployed on the surface of the water and can only move in vertical direction in 3-D space, the algorithm is first to control the nodes in-depth and relocate the nodes at different depths, then the nodes continue to adjust their depths until there is no augment for improving their coverage, and to achieve efficient coverage of the three-dimensional sensor networks ultimately. Experimental results show that compared with traditional random deployment method, the proposed coverage control algorithm can improve coverage of network effectively.

关键词： Quality control

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Overhead Power Line Detection from UAV Video Images

Overhead Power Line Detection from UAV Video Images

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International Conference on Mechatronics and Machine Vision in Practice

作者： Tang Wen YANG Hang YIN Qiu Qi RUAN Jian Da HAN Jun Tong QI Qing YONG Zi Tong WANG Zeng Qi SUN Beijing Key Laboratory of Advanced Information Science and Network Technology Institute of Information Science Beijing Jiaotong University Beijing 100044 China Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China State Key Laboratory of Robotics Shenyang Institute of Automation CAS Shenyang 110016 China Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)9781467316439

Currently, unmanned aerial vehicles (UAVs) are applied to routine inspection tasks of electric distribution networks. As an important information source, machine vision attracts much attention in the area of the UAV's autonomous control. To this end, real-time algorithms are studied-in this paper to detect the power lines in the UAV video images. First, video images are converted into binary images through an adaptive thresholding approach. Then, Hough Transform is used to detect line candidates in the binary images. Finally, a fuzzy C- means (FCM) clustering algorithm is used to discriminate the power lines from the detected line candidates. The properties of power lines are used to remove the spurious lines, and the length and slope of the detected lines are used as features to establish the clustering data set. Experimental results show that the algorithms proposed are effective and able to tolerate noises from complicated terrain background and various illuminations.

关键词： Hough transforms autonomous aerial vehicles computer vision fuzzy set theory pattern clustering power overhead lines power system control video signal processing

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Alloy-based verification of Web service composition

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Tongxin Xuebao/Journal on Communications 2012年第SUPPL.2期33卷 1-8页

作者： Cao, Jiu-Xin Wu, Jiang-Lin Wang, Guo-Jin Liu, Bo Yang, Peng-Wei Dong, Dan School of Computer Science and Engineering Southeast University Nanjing 210096 China Key Laboratory of Computer Network and Information Integration Ministry of Education Southeast University Nanjing 210096 China Huawei Technologies Co. Nanjing 210012 China

Service composition was the core problem of service computing, the validity and reliability of service composition had become the premise of service execution. A method was presented which utilizes the finite state machine (FSM) to model the business process's state transitions, and described the required properties with Alloy language. Then, Alloy model was used to formalize the service FSM and the required properties of the system. Finally, Alloy Analyzer was used to verify the model that whether the required properties were satisfied. It is shown that the method of Alloy-based verification of the service composition is of good feasibility.

关键词： Alloys

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