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IEEE International Conference on Communications (ICC)

作者： Weile Zhang Qinye Yin Hongyang Chen Wenjie Wang Tomoaki Ohtsuki MOE Key Laboratory for Intelligent Networks and Network Security Xi''an Jiaotong University Xi'an China Institute of Industrial Science University of Tokyo Tokyo Japan Department of Information and Computer Science Keio University Yokohama Japan

In this paper, we propose a distributed angle estimation method for wireless sensor network localization with multipath fading. The multiple antenna system is equipped at the anchor and the angle of departure (AOD) can be estimated individually at each sensor node with single antenna system. Further, we exploit the space diversity to improve the estimation performance by deploying multiple parallel arrays at the anchor. Analysis and simulations demonstrate the effectiveness of our method.

关键词： Estimation Receivers Peer to peer computing Wireless sensor networks Interference Delay Transceivers

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Strong Security Enabled Certificateless Aggregate Signatures Applicable to Mobile Computation

Strong Security Enabled Certificateless Aggregate Signatures...

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International Conference on Intelligent networking and Collaborative Systems (INCOS)

作者： Hu Xiong Qianhong Wu Zhong Chen Key Laboratory of Network and Software Security Assurance of the Ministry of Education Institute of Software School of Electronics Engineering and Computer Science Peking University Beijing China Department of Computer Engineering and Mathematics UNESCO Chair in Data Pr Universitat Rovira i Virgili Tarragona Spain Key Laboratory of AeroSpace Information Security and Trusted Computing Ministry of Education School of Computer Wuhan University of China China

An aggregate signature scheme allows a public algorithm to aggregate n signatures of n distinct messages from n signers into a single signature. By validating the single resulting signature, one can be convinced that the messages have been endorsed by all the signers. Certificateless aggregate signatures allow the signers to authenticate messages without suffering from the complex certificate management in the traditional public key cryptography or the key escrow problem in identity-based cryptography. In this paper, we present a new efficient certificate less aggregate signature scheme. Compared with up-to-date certificate less aggregate signatures, our scheme is equipped with a number of attracting features: (1) it is shown to be secure under the standard computational Diffie-Hellman assumption in the random oracle model, (2) the security is proven in the strongest security model so far, (3) the signers do not need to be synchronized, and (4) its performance is comparable to the most efficient up-to-date schemes. These features are desirable in a mobile networking and computing environment where the storage/computation capacity of the end devices are limited, and due to the wireless connection and distributed feature, the computing devices are easy to be attacked and hard to be synchronized.

关键词： Aggregates Games Generators Synchronization Public key cryptography

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Genetic algorithm-based power management in cloud platform

Genetic algorithm-based power management in cloud platform

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International Conference on Internet Technology and Applications

作者： Xiong, Zili Zhang, Zhang Kong, Huafeng Zou, Deqing School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Information Network Security Ministry of Public Security Third Research Institute of Ministry of Public Security Shanghai 201204 China

ISBN: (纸本)9781424472550

Cloud computing is a novel computing pattern, and it can provide underlying hardware resource for cloud users on demand. Virtualization is the key technology of cloud computing, and it provides the technical support for cloud computing. In cloud platform, power management is an indispensable function of cloud system administration. Based on genetic algorithm, this paper proposes a power management method based on virtual cluster. The experiments on Xen platform prove the effectiveness of our method. © 2011 IEEE.

关键词： Virtualization

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A Novel Effective ICI Self-Cancellation Method

A Novel Effective ICI Self-Cancellation Method

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Miao-Wen Wen Xiang Cheng Xing Wei Bo Ai Bing-Li Jiao School of Electronics Engineering & Computer Science Peking University Beijing China Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China School of Information and Electronics Beijing Institute of Technology Beijing China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China

Orthogonal Frequency Division Multiplexing (OFDM) systems may suffer from both carrier frequency offset (CFO) and in-phase/quadrature-phase (I/Q) imbalance at the receiver front end. In this paper, a novel type of intercarrier interference (ICI) self-cancellation method using mirror mapping is proposed to combat these impairment. Based on the proposed novel method and by adopting two widely used mapping operations, we altogether derive two different mirror mapping schemes. Analysis and simulation results verify that the proposed mirror mapping schemes not only inherit the efficiency of the existing self-cancellation schemes in suppressing ICI caused by CFO but also have the ability of compressing or even eliminating IQ imbalance.

关键词： OFDM Mirrors Bit error rate Receivers Modulation Educational institutions Strontium

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A fuzzy adaptive multi-population parallel genetic algorithm for spam filtering

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Journal of Convergence information Technology 2011年第2期6卷 172-182页

作者： Zhao, Zheng-dong Wang, Gang Zhao, Wei Chen, Hui-ling Zhao, Wei Li, Lu-lu Network Information Center Changchun University of Science and Technology Changchun China College of Computer Science and Technology Jilin University Changchun China Key Laboratory of Symbolic Computation Knowledge Engineering of Ministry of Education Jilin University Changchun 130012 China Department of Information Engineering Jilin Police College China Branch Institute of information technology Changchun Vocational Institute of Technology Changchun China

Nowadays, e-mail is one of the most inexpensive and expeditious means of communication. However, a principal problem of any internet user is the increasing number of spam, and therefore an efficient spam filtering method is imperative. Feature selection is one of the most important factors, which can influence the classification accuracy rate. To improve the performance of spam prediction, this paper proposes a new fuzzy adaptive multi-population parallel genetic algorithm (FAMGA) for feature selection. To maintain the diversity of population, a few studies of multi-swarm strategy are reported, whereas the dynamic parameter setting has not been considered further. The proposed method is based on multiple subpopulations and each subpopulation runs in independent memory space. For the purpose of controlling the subpopulations adaptively, we put forward two regulation strategies, namely population adjustment and subpopulation adjustment. In subpopulation adjustment, a controller is designed to adjust the crossover rate for each subpopulation, and in population adjustment, a controller is designed to adjust the size of each subpopulation. Three publicly available benchmark corpora for spam filtering, the PU1, Ling-Spam and Spam Assassin, are used in our experiments. The results of experiments show that the proposed method improves the performance of spam filtering, and is significantly better than other feature selection methods. Thus, it is proved that the multi-population regulation strategy can find the optimal feature subset, and prevent premature convergence of the population.

关键词： Data mining

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Large scale plane wave pseudopotential density functional theory calculations on GPU clusters

Large scale plane wave pseudopotential density functional th...

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2011 International Conference for High Performance Computing, networking, Storage and Analysis, SC11

作者： Wang, Long Jia, Weile Chi, Xuebin Wu, Yue Gao, Weiguo Wang, Lin-Wang Supercomputing Center of Computer Network Information Center Chinese Academy of Sciences No. 4 South 4th Street ZhongGuanCun Beijing China School of Mathematical Sciences Fudan University 220 Handan Road Shanghai 200433 China MOE Key Laboratory of Computational Physical Sciences School of Mathematical Sciences Fudan University 220 Handan Road Shanghai 200433 China Lawrence Berkeley National Laboratory Material Science Division Mail stop 50F One Cyclotron Road Berkeley CA 94720 United States

ISBN: (纸本)9781450307710

In this work, we present our implementation of the density functional theory (DFT) plane wave pseudopotential (PWP) calculations on GPU clusters. This GPU version is developed based on a CPU DFT-PWP code: PEtot, which can calculate up to a thousand atoms on thousands of processors. Our test indicates that the GPU version can have a ∼10 times speed-up over the CPU version. A detail analysis of the speed-up and the scaling on the number of CPU/GPU computing units‡ (up to 256) are presented. The success of our speed-up relies on the adoption a hybrid reciprocal-space and band-index parallelization scheme. As far as we know, this is the first GPU DFT-PWP code scalable to large number of CPU/GPU computing units. We also outlined the future work, and what is needed to further increase the computational speed by another factor of 10. Copyright 2011 ACM.

关键词： Density functional theory

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Based on Ajax technology's online time functional analysis and implementation

Based on Ajax technology's online time functional analysis a...

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International Conference on computer Science and Service System (CSSS)

作者： Lei Xia Shujun Zhang School of computer and information technology Beijing key laboratory of advanced information science and network technology Beijing Jiaotong University Beijing China

ISBN: (纸本)9781424497621

With the continuous development of Internet technology and Page Content's Diversity form, Traditional page model Shows its drawbacks. Ajax technology can transfer important information between client and Server-side, that increases the speed of transmission and make the page responds more timely. This technology is widely used in online examination system's design. Text starts from Ajax technology, and that compares with traditional page model, finally, examination timing function is analyzed, and design implementation.

关键词： information technology XML Internet computers Java System analysis and design Educational institutions

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The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

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Journal of Botany 2012年第1期2012卷

作者： Hong-Mei Liu Robert J. Dyer Zhi-You Guo Zhen Meng Jian-Hui Li Harald Schneider Key Laboratory of Southern Subtropical Plant Diversity Fairylake Botanical Garden Shenzhen & Chinese Academy of Sciences Shenzhen 518004 China Department of Life Sciences Natural History Museum London SW7 5BD UK Research Group in Biodiversity Genomics and Environmental Sciences Imperial College London Silwood Park Campus Ascot Berkshire SL5 7PY UK Department of Biological Sciences Qiannan Normal College for Nationalities Duyun 558000 China Computer Network Information Center Chinese Academy of Sciences Beijing 100190 *** State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences Beijing 100093 ***

The disparate distribution of apomixis between the major plant lineages is arguably one of the most paradoxical phenomena in plant evolution. Ferns are particularly interesting for addressing this issue because apomixis is more frequent than in any other group of plants. Here, we use a phylogenetic framework to explore some aspects of the evolution of apomixis in ferns and in particular in the polystichoid ferns. Our findings indicate that apomixis evolved several times independently in three different clades of polystichoid ferns. A lineage-wide perspective across ferns indicates a correlation between apomixis and the species richness of lineages; however BiSSE tests did not recover evidence for a correlation of apomixis and diversification rates. Instead, evidence was recovered supporting an association between the establishment of apomixis and reticulate evolution, especially in the establishment of triploid hybrids. Diversification time estimates supported the hypothesis of short living apomictic lineages and indicated a link between the establishment of apomixis and the strengthening of the monsoons caused by the lifting of the Qinghai-Tibetan plateau. In general our results supported the hypothesis for the rare establishment of apomictic lineages, high extinction risks, and low speciation rates.

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Multi-User Private keyword Search for Cloud Computing

Multi-User Private Keyword Search for Cloud Computing

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IEEE International Conference on Cloud Computing Technology and Science (CloudCom)

作者： Yanjiang Yang Haibing Lu Jian Weng Institute for Infocomm Research Singapore Department of Operations Management and Information Systems The Leavey School of Business Santa Clara University USA State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications China Department of Computer Science and Emergency Technology Research Center of Risk Department of Computer Science and Emergency Technology Research Center of Risk Evaluation and Prewarning on Public Network Security Jinan University Guangzhou China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences China

Enterprises outsourcing their databases to the cloud and authorizing multiple users for access represents a typical use scenario of cloud storage services. In such a case of database outsourcing, data encryption is a good approach enabling the data owner to retain its control over the outsourced data. Searchable encryption is a cryptographic primitive allowing for private keyword based search over the encrypted database. The above setting of enterprise outsourcing database to the cloud requires multi-user searchable encryption, whereas virtually all of the existing schemes consider the single-user setting. To bridge this gap, we are motivated to propose a practical multi-user searchable encryption scheme, which has a number of advantages over the known approaches. The associated model and security requirements are also formulated. We further discuss to extend our scheme in several ways so as to achieve different search capabilities.

关键词： Encryption Indexes keyword search Cloud computing

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Digital image hiding arithmetic based on hermite chaotic neural networks

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ICIC Express Letters, Part B: Applications 2011年第1期2卷 165-170页

作者： Zou, Ajin Luo, Yixiang Xie, Dongqing Peng, Lingxi Information College Guangdong Ocean University No. 40 East Jiefang Road Xiashan District Zhanjiang 524088 China School of Computer Science Educational Software Guangzhou University No. 230 Wai Huan Xi Road Guangzhou 510006 China Network and Data Security Key Laboratory of Sichuan Province Chengdu 611731 China

An image hidden information algorithm inspired by chaotic neural networks, referred as DiaHao, is presented. The secret information of digital image is XOR en- crypted by chaotic stream cipher sequence that is generated from Hermite chaotic neural networks, and then the chaotic digital watermark is generated;finally, the encryption matrix is embedded to the carrier image. In this way, unauthorized users can not perceive the presence of digital watermarking from the image appearance, which will avoid their illegal attention attacks. These will achieve the secret transfer of confidential information and the purpose of covert communication. The decryption is carried out by the inverse encryption matrix's extraction of hidden watermark information, and then the XOR operation will be done to get the original image. Both the theoretical analysis and simulation experiments show the method's security and invisibility. Furthermore, the algorithm is simple and feasible. © 2011 ISSN 2185-2766.

关键词： Neural networks

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