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Journal of Software 2010年第7期5卷 697-704页

作者： Tan, Zuowen School of Information Technology Jiangxi University of Finance and Economics Nanchang City 330013 Jiangxi Province China Key Lab of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 Fujian Province China

The authenticated encryption scheme allows one signer to generate an authenticated cipher-text so that no one except the designated verifier can recover the message and verify the message. In a (t, n) threshold authenticated encryption scheme, any t or more signers can generate an authenticated encryption for a message and send it to the designated verifier. Compared with the conventional encryption-then-signature schemes, threshold authenticated encryption schemes can meet more security requirements, including robustness, confidentiality, unforgeability, integrity, authenticity and non-repudiation. Based on Tseng and Jan's authenticated encryption scheme and elliptic curve cryptosystem, Chung et al. [2] recently proposed an efficient (t, n) threshold authenticated encryption scheme which can reduce the load of the signers by applying a division-of-labor signature technique. However, the paper demonstrates that there exists a design defect, the threshold authentication signature scheme cannot resist against insider attack and the scheme is not robust. Then, an improved authenticated encryption scheme based on elliptic curve cryptosystem is proposed. The novel authenticated encryption scheme removes the above-mentioned weaknesses. © 2010 ACADEMY PUBLISHER.

关键词： Cryptography

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Adaptive spread-transform dither modulation using a new perceptual model for color image watermarking

Adaptive spread-transform dither modulation using a new perc...

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作者： Ma, Lihong Yu, Dong Wei, Gang Tian, Jing Lu, Hanqing Guangdong Key Lab of Wireless Network and Terminal School of Electronic and Information Engineering South China University of Technology Guangzhou 510641 China Co. Ltd. Tianhe Software Park 6F No. 44 Jian Zhong Road Tianhe District Guangzhou 510665 China School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore Singapore National Lab of Patt. Recog. Institute Automation China Academy of Science Beijing 100080 China

Major challenges of the conventional spread-transform dither modulation (STDM) watermarking approach are two-fold: (i) it exploits a fixed watermarking strength (more particularly, the quantization index step size) to the whole cover image;and (ii) it is fairly vulnerable to the amplitude changes. To tackle the above challenges, an adaptive spreadtransform dither modulation (ASTDM) approach is proposed in this paper for conducting robust color image watermarking by incorporating a new perceptual model into the conventional STDM framework. The proposed approach exploits a new perceptual model to adjust the quantization index step sizes according to the local perceptual characteristics of a cover image. Furthermore, in contrast to the conventional Watson's model is vulnerable to the amplitude changes, our proposed new perceptual model makes the luminance masking thresholds be consistent with any amplitude change, while keeping the consistence to the properties of the human visual system. In addition, certain color artifacts could be incurred during the watermark embedding procedure, since some intensity values are perceptibly changed to label the watermark. For that, a color artifact suppression algorithm is proposed by mathematically deriving an upper bound for the intensity values according to the inherent relationship between the saturation and the intensity components. Extensive experiments are conducted using 500 images selected from Corel database to demonstrate the superior performance of the proposed ASTDM *** © 2010 The Institute of Electronics, Information and Communication Engineers.

关键词： Color

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Virtual node based adaptive routing in wireless ad hoc networks

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中国高等学校学术文摘·计算机科学 2009年第4期3卷 535-542页

作者： Gang LI Hongmei SUN Key Lab of Network Science and Technology Institute of Computing TechnologyChinese Academy of SciencesBeijing 100080China Communications Technology Lab Intel China Research CenterBeijing 100080China

It is a challenge to make the routes quickly adapt to the changed network topology when nodes fail in a wireless ad hoc *** this paper,we propose an adaptive routing protocol,which groups the network nodes into virtual nodes according to their data transfer capabilities and creates virtual-node-based *** protocol can accommodate the routes to node failures by adaptively updating the virtual nodes and just-in-time using available nodes during data *** simulations indicate that the proposed protocol can keep the routes failed-node-free when the available virtual node members cover the failed nodes scattering area.

关键词： wireless ad hoc networks mobile ad hoc networks route protocols adaptability route repair

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Search for → μ + μ − and B0 → μ + μ − decays

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Journal of High Energy Physics 2012年第4期2012卷 1-36页

作者： Chatrchyan, S. Khachatryan, V. Sirunyan, A. M. Tumasyan, A. Adam, W. Bergauer, T. Dragicevic, M. Erö, J. Fabjan, C. Friedl, M. Frühwirth, R. Ghete, V. M. Hammer, J. Hörmann, N. Hrubec, J. Jeitler, M. Kiesenhofer, W. Krammer, M. Liko, D. Mikulec, I. Pernicka, M. Rahbaran, B. Rohringer, C. Rohringer, H. Schöfbeck, R. Strauss, J. Taurok, A. Wagner, P. Waltenberger, W. Walzel, G. Widl, E. Wulz, C.-E. Mossolov, V. Shumeiko, N. Suarez Gonzalez, J. Bansal, S. Cerny, K. Cornelis, T. De Wolf, E. A. Janssen, X. Luyckx, S. Maes, T. Mucibello, L. Ochesanu, S. Roland, B. Rougny, R. Selvaggi, M. Van Haevermaet, H. Van Mechelen, P. Van Remortel, N. Van Spilbeeck, A. Blekman, F. Blyweert, S. D’Hondt, J. Gonzalez Suarez, R. Kalogeropoulos, A. Maes, M. Olbrechts, A. Van Doninck, W. Van Mulders, P. Van Onsem, G. P. Villella, I. Charaf, O. Clerbaux, B. De Lentdecker, G. Dero, V. Gay, A. P. R. Hreus, T. Léonard, A. Marage, P. E. Reis, T. Thomas, L. Vander Velde, C. Vanlaer, P. Adler, V. Beernaert, K. Cimmino, A. Costantini, S. Garcia, G. Grunewald, M. Klein, B. Lellouch, J. Marinov, A. Mccartin, J. Ocampo Rios, A. A. Ryckbosch, D. Strobbe, N. Thyssen, F. Tytgat, M. Vanelderen, L. Verwilligen, P. Walsh, S. Yazgan, E. Zaganidis, N. Basegmez, S. Bruno, G. Ceard, L. Delaere, C. du Pree, T. Favart, D. Forthomme, L. Giammanco, A. Hollar, J. Lemaitre, V. Liao, J. Militaru, O. Nuttens, C. Pagano, D. Pin, A. Piotrzkowski, K. Schul, N. Beliy, N. Caebergs, T. Daubie, E. Hammad, G. H. Alves, G. A. Correa Martins, M. De Jesus Damiao, D. Martins, T. Pol, M. E. Souza, M. H. G. Aldá, W. L. Carvalho, W. Custódio, A. Da Costa, E. M. De Oliveira Martins, C. Fonseca De Souza, S. Matos Figueiredo, D. Mundim, L. Nogima, H. Oguri, V. Prado Da Silva, W. L. Santoro, A. Silva Do Amaral, S. M. Soares Jorge, L. Sznajder, A. Bernardes, C. A. Dias, F. A. Fernandez Perez Tomei, T. R. Gregores, E. M. Lagana, C. Marinho, F. Mercadante, P. G. Novaes, S. F. Padula, Sandra S. Genchev, V. Iaydjiev, P. Piperov, S. Rodozov, M. Stoykova, S. Sultanov, G. Tcholakov, V. Traya Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik der OeAW Wien Austria CERN European Organization for Nuclear Research Geneva Switzerland National Centre for Particle and High Energy Physics Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium National Institute of Chemical Physics and Biophysics Tallinn Estonia Université de Mons Mons Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Instituto de Fisica Teorica Universidade Estadual Paulista Sao Paulo Brazil Universidade Federal do ABC Santo Andre Brazil California Institute of Technology Pasadena USA Suez Canal University Suez Egypt Institute for Nuclear Research and Nuclear Energy Sofia Bulgaria University of Sofia Sofia Bulgaria Institute of High Energy Physics Beijing China State Key Lab. of Nucl. Phys. and Tech. Peking University Beijing China Universidad de Los Andes Bogota Colombia Technical University of Split Split Croatia Laboratoire Leprince-Ringuet Ecole Polytechnique IN2P3-CNRS Palaiseau France University of Split Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Zewail City of Science and Technology Zewail Egypt Cairo University Cairo Egypt Fayoum University El-Fayoum Egypt British University Cairo Egypt Ain Shams University Cairo Egypt Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland DSM/IRFU CEA/Saclay Gif-sur-Yvette France Soltan Institute for Nuclear Studie

A search for the rare decays $ {\text{B}}_{\text{s}}^0 $ → μ + μ − and B0 → μ + μ − is performed in pp collisions at $ \sqrt {s} = {7}\;{\text{TeV}} $ , with a data sample corresponding to an integrated luminosity of 5 fb−1 collected by the CMS experiment at the LHC. In both decays, the number of events observed after all selection requirements is consistent with the expectation from background plus standard model signal predictions. The resulting upper limits on the branching fractions are $ \mathcal{B}\left( {{\text{B}}_{\text{s}}^0 \to {\mu^{ + }}{\mu^{ - }}} \right) < {7}.{7} \times {1}{0^{{ - {9}}}} $ and $ \mathcal{B}\left( {{{\text{B}}^0} \to {\mu^{ + }}{\mu^{ - }}} \right) < 1.8 \times {10^{{ - 9}}} $ at 95% confidence level.

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Building a resource overlay for distributed monitoring

Building a resource overlay for distributed monitoring

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1st International Conference on Information science and Engineering, ICISE2009

作者： Li, Wei Fan, Ruiting Zhang, Long School of Computer Science and Technology Key Lab. of Beijing Network Technology Beihang University Beijing China

ISBN: (纸本)9780769538877

To address the problems of resource sharing and utilization in the distributed environment, the paper aims to establish a resource overlay for the distributed system monitoring. The resource overlay can construct a logical space, and the type of the nodes in the space can be classified as host node and resource node. The host node and resource node are mapped into the logical space of network by the consistent hash function and the location preserving hash function respectively. An improved DHT algorithm is used to establishing the resource overlay, and supporting the range query for the resource information. Experiments have proved the validation of the method, and the results show that it is an effective method for finding the available resource in less routing hops. ©2009 IEEE.

关键词： Hash functions

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Approach to extracting hot topics based on network traffic content

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Frontiers of Electrical and Electronic Engineering in China 2009年第1期4卷 20-23页

作者： Yadong ZHOU Xiaohong GUAN Qindong SUN Wei LI Jing TAO MOE Key Lab for Intelligent Networks and Network Security State Key Lab for Manufacturing SystemsXi’an Jiaotong UniversityXi’an 710049China Department of Automation Tsinghua National Lab for Information Science and TechnologyTsinghua UniversityBeijing 100084China School of Computer Science and Engineering Xi’an University of TechnologyXi’an 710048China

This article presents the formal definition and description of popular topics on the Internet,analyzes the relationship between popular words and topics,and finally introduces a method that uses statistics and correlation of the popular words in traffic content and network flow characteristics as input for extracting popular topics on the *** on this,this article adapts a clustering algorithm to extract popular topics and gives formalized *** test results show that this method has an accuracy of 16.7%in extracting popular topics on the *** with web mining and topic detection and tracking(TDT),it can provide a more suitable data source for effective recovery of Internet public opinions.

关键词： hot topic extraction network traffic content Internet public opinion analysis

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AN EFFICIENT VIDEO SIMILARITY SEARCH STRATEGY FOR VIDEO-ON-DEMAND SYSTEMS

AN EFFICIENT VIDEO SIMILARITY SEARCH STRATEGY FOR VIDEO-ON-D...

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2009 2nd IEEE International Conference on Broadband network & Multimedia technology(2009年宽带网络与多媒体国际会议 IEEE IC-BNMT2009)

作者： Cao Zheng Zhu Ming The Key Lab of Network Communication System & Control The Chinese Academy of Sciences The Key Lab of Network Communication System & Control Anhui Department of Automation University of Science and Technology of China

The video-on-demand systems and video share web are more and more popular in recent years. Video similarity search for content-based video retrieval is important in web service and research field. There is still no satisfying search method for scalable fast similarity search in large video database. In order to solve two challenging problems: video similarity measure and fast search method in large database, a novel efficient video similarity search strategy for video-on-demand systems is proposed in this paper. A compact video signature was computed according to image histogram and spatial-temporal features of video. The video similarity is measured by the computation of the distance of video signature. For the scalable computing requirement, a new search method based on Clustering Index Table was presented by index clustering. The experimental results from the query tests in large database show this method is highly efficient and effective for similar video search.

关键词： Video similarity search Video signature Spatial-temporal distribution Clustering indez table

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Competitive adsorption of Ca2+, K+, Cd2+ and Pb2+

Competitive adsorption of Ca2+, K+, Cd2+ and Pb2+

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2009 AIChE Annual Meeting, 09AIChE

作者： Wang, Tao Zhou, Yun Key Lab. of Hollow Fiber Membrane Materials and Membrane Process of Ministry of Education Tianjin Polytechnic University Tianjin 300160 China Tianjin Lonwin Network Science and Technology Development Corp. Tianjin 300181 China

Active sludge was acclimation by Ca2+, K+, Cd 2+ and Pb2+ together, then it be used to study single and competitive isothermal adsorption of the four kinds of metal ions. It show that the regulations of Ca2+, K+, Cd2+ and Pb 2+'s single isothermal adsorption accord with Langmuir model. Competitive adsorption between hard-hard ions, soft-soft ions and hard-soft ions was also studied. These competitive adsorption processes were proved accord with Freundlich model. It was found that competitive adsorption obviously happened between the same kinds of hard or soft metal ions while happened not obviously between different kinds of metal ions. Soft ions could be better absorbed than hard ions in biofilm. We explain this phenomenon by coordination radicle bond theory.

关键词： Metal ions

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Improvement of MODIS 8-day LAI/FPAR product with temporal filters to generate high quality time-series product

Improvement of MODIS 8-day LAI/FPAR product with temporal fi...

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2009 Joint Urban Remote Sensing Event

作者： Huifang, Zhang Runhe, Shi Honglin, Zhong Peiqing, Qu Juan, Sun Wenpeng, Lin Su, Li Key Lab. of Geographic Information Science Ministry of Education East China Normal University Shanghai China Key Laboratory of Ecosystem Network Observation and Modeling IGSNRR CAS Beijing China Key Lab. of Urban Ecology and Environment Restoration Shanghai Normal University Shanghai China Computer College Beijing Technology and Business University Beijing China

ISBN: (纸本)9781424434619

Numerous studies have reported that the timeseries terrestrial parameters such as the Normalized Difference Vegetation Index (NDVI), Leaf Area of Index (LAI), Fraction of Absorbed Photosynthetic Active Radiation (FPAR), derived from NOAA/AVHRR, SPOT/VEGETATION, TERRA or AQUA/MODIS, have played significant roles in researching the global environment, terrestrial ecosystems and related ecological researches. However, the remotely sensed signals are interfered severely by atmospheric conditions especially clouds and such noises exists in the time-series products as well. Therefore, to obtain a high quality time-series of terrestrial parameter is a necessary step before further studies. At present several methods have been applied to reduce the noise to construct a fine time-series of NDVI, but few studies concerning the other key terrestrial parameters, such as LAI, FPAR etc. In this paper, after comparing general methods in literatures, we designed a new method based on the Savitzky-Golay filter, which was applied to improve the quality of MODIS 8-Day LAI/FPAR Product to generate timeseries of LAI and FPAR with high quality. Our validation results indicate that more smooth and realistic time-series curves of LAI/FPAR can be obtained by using this new method, which exemplify the dynamic change of forests, crop or plants and key input parameters in modeling the complex land surface processing. ©2009 IEEE.

关键词： Time series

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An improved identity-based group signature scheme

An improved identity-based group signature scheme

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2009 International Conference on Computational Intelligence and Security, CIS 2009

作者： Tan, Zuowen School of Information Technology Jiangxi University of Finance and Economics Nanchang 330013 Jiangxi Province China Key Lab. of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 Fujian Province China

ISBN: (纸本)9780769539317

In a group signature scheme, a group member signs messages anonymously on behalf of the group. However, in the case of a dispute, the actual group signer's identity can be revealed by a designated entity. In this paper, we propose a new identity-based group signature scheme using bilinear maps. The group signature scheme is well suited for large groups, i.e., the length of the groups public key and the length of signatures are independent on the size of the group. Our signature scheme is based on bilinear maps. Furthermore, a group member can sign many messages using the same key pair. Cryptanalysis shows that the proposed group signature scheme is secure under the computational Diffie Hellman problem called CDHP assumption. And it is also more efficient than previous ones satisfying these requirements. © 2009 IEEE.

关键词： Cryptography

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