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Local segment-shared protection based on source egress gateway selection for multi-domain optical mesh networks

Science china(information Sciences) 2011年第2期54卷 227-235页

作者： ZHANG ShengFeng1,3, PENG YunFeng1,2, DU Shu1, YANG XiaoLong1,2 & LONG KePing1,2 1Research Center for Optical Internet and Mobile information networks, University of Electronic Science and technology of china, Chengdu 611731, china 2Institute of Advanced network technology and New Serives (ANTS), University of Science and technology Beijing, Beijing 100083, china 3Research Center for Optical Internet networks, Chongqing University of Posts and Telecommunications, Chongqing 400065, china Research Center for Optical Internet and Mobile information networks University of Electronic Science and Technology of China Chengdu China Research Center for Optical Internet networks Chongqing University of Posts and Telecommunications Chongqing China Institute of Advanced network technology and New Serives (ANTS) University of Science and Technology Beijing Beijing China

Survivability for multi-domain optical networks is becoming a key parameter due to expanding network. In order to provide the shared-path-protected lightpath in multi-domain optical mesh networks, we propose a protection solution, called GSLSSP. A new source egress gateway selecting mechanism is adopted in this solution. For each connection request, this mechanism can enable the source node to select a better egress gateway node to the destination domain and compute one inter-domain working path near the optimal path with the cooperating of this gateway node, under scalability and domain privacy constraint of multi-domain networks. And then one intra-domain link-disjoint local segment-backup path for each working-segment path is computed out in each single-domain passed by the working path. Simulation evaluation shows that the proposed scheme can provide 100% protection ability for multiple failures. Besides, it is effective in multi-domain path protection with more efficient resource utilization, lower blocking probabilities and less inter-domain cost than other schemes.

关键词： survivability optical mesh networks multi-domains multiple failures segment-shared protection

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The endocrine regulation network of growth hormone synthesis and secretion in fish: Emphasis on the signal integration in somatotropes

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Science china(Life Sciences) 2010年第4期53卷 462-470页

作者： LI WenSheng & LIN HaoRan State key laboratory of Biocontrol, Institute of Aquatic Economic Animals and the Guangdong provincial key laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, china State key laboratory of Biocontrol Institute of Aquatic Economic Animals and the Guangdong Provincial Key Laboratory for Aquatic Economic Animals School of Life Sciences Sun Yat-sen University Guangzhou China

In teleosts, growth hormone (GH) production is governed by multiple neuroendocrine factors from the hypothalamus and other regulators from the pituitary and peripheral organs. Exploring the principles followed by pituitary somatotropes when differentiating and integrating the signals from these regulators at the cellular and intracellular level is essential for understanding the endocrine regulation network of growth hormone synthesis and secretion in fish. This paper discusses recent advances in the action mechanisms of GH regulation factors, including the neuroendocrine regulators, pituitary level factors and peripheral factors, primarily involved in their receptor systems as well as in post-receptor signal transduction pathways.

关键词： fish growth hormone receptor signal transduction

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Research of Double-threshold Energy Detection with Square-Law Combining over Nakagami Channel

Research of Double-threshold Energy Detection with Square-La...

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“智慧城市和绿色IT”2011年通信与信息技术新进展——第八届中国通信学会学术年会

作者： Peng SHI~1,Wanpei CHEN~1,Zhengquan LI~(1,2,3) 1 information Engineering College of Yangzhou University 2 zhejiang provincial key laboratory of information network technology 3 information Engineering College of china Jiliang University

In this paper a scheme of energy detection is proposed to improve performance of spectrum *** first, Nakagami channel is chosen to imitate wireless ***,double-threshold energy detection algorithm is used to settle the problem of noise uncertainty in actual communication *** addition,square-law combining technology is presented because it can solve the problem of low detection probability caused by double-threshold energy detection *** results show that error detection probability can be reduced by using double-threshold energy detection algorithm,and it becomes lower after square-law *** more,square-law combining technology can greatly decrease high miss probability caused by double-threshold energy detection algorithm.

关键词： cognitive radio energy detection Nakagami channel double-threshold square-law combining error detection probability

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Polling Algorithm Based on Traffic Burst Characteristics of Broadband Wireless Access Systems

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Journal of Shanghai Jiaotong university(Science) 2011年第4期16卷 429-435页

作者：李秀媛李炜吴晓娟张云峰 School of Computer Science and technology Shandong Economy University School of information Science and Engineering Shandong University Shandong provincial key laboratory of Digital Media technology

In this paper,we propose a novel polling algorithm to decrease the number of idle slots and collission slots during the polling cycle by evaluating the bandwidth request of the subscribe stations(SSs) in the next polling cycle for broadband wireless access(BWA) *** firstly analyze the feature of silent time intervals and deduce the Hurst index which symbolizes the degree of self-similarity and long-relative *** we represent the inactive OFF time intervals by the Pareto model and estimate the shape parameterαby the group measured *** we can evaluate the transmission probability of a silent SS before the next polling cycle. By this algorithm,we can find the optimal transmission opportunities for the base station(BS) to achieve the least collision or void timeslots in order to achieve the largest bandwidth *** theoretical analysis and simulation results show that this polling algorithm can improve the performance for BWA system.

关键词： broadband wireless access(BWA) systems polling algorithm bandwidth allocation self-similarity

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Efficient DPCA SAR imaging with fast iterative spectrum reconstruction method

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Science china(information Sciences) 2012年第8期55卷 1838-1851页

作者： FANG Jian1,ZENG JinShan1,XU ZongBen1&ZHAO Yao2 1M inistry of Education key Lab for Intelligent networks and network Security Xi'an Jiaotong University,Xi'an 710049,china 2N ational key laboratory of Science and technology on Microwave Imaging&Institute of Electronics,Chinese Academy of Sciences,Beijing 100049,china Ministry of Education key Lab for Intelligent networks and network Security Xi’an Jiaotong University Xi’an China National key laboratory of Science and technology on Microwave Imaging & Institute of Electronics Chinese Academy of Sciences Beijing China

The displaced phase center antenna(DPCA)technique is an effective strategy to achieve wide-swath synthetic aperture radar(SAR)imaging with high azimuth ***,traditionally,it requires strict limitation of the pulse repetition frequency(PRF)to avoid non-uniform ***,any deviation could bring serious ambiguity if the data are directly processed using a matched *** break this limitation,a recently proposed spectrum reconstruction method is capable of recovering the true spectrum from the nonuniform ***,the performance is sensitive to the selection of the *** regularization based imaging may provide a way to overcome this *** existing time-domain method,however,requires a large-scale observation matrix to be built,which brings a high computational *** this paper,we propose a frequency domain method,called the iterative spectrum reconstruction method,through integration of the sparse regularization technique with spectrum analysis of the DPCA *** approximately expressing the observation in the frequency domain,which is realized via a series of decoupled linear operations,the method performs SAR imaging which is then not directly based on the observation matrix,which reduces the computational cost from O(N2)to O(N log N)(where N is the number of range cells),and is therefore more efficient than the time domain *** sparse regularization scheme,realized via a fast thresholding iteration,has been adopted in this method,which brings the robustness of the imaging process to the PRF *** provide a series of simulations and ground based experiments to demonstrate the high efficiency and robustness of the *** simulations show that the new method is almost as fast as the traditional mono-channel algorithm,and works well almost independently of the PRF ***,the suggested method can be accepted as a practical and efficient wide-swath SAR imaging technique.

关键词： displaced phase center antenna sparse regularization iterative thresholding spectrum reconstruction

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Displacement residual based DDM matching algorithm

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Science china(information Sciences) 2012年第9期55卷 2090-2101页

作者： ZHANG Lin 1,2,ZHOU Zhong 1,2,LIU Lin 1,2 & WU Wei 1,2 1 State key laboratory of Virtual Reality technology and Systems,Beihang University,Beijing 100191,china 2 School of Computer Science and Engineering,Beihang University,Beijing 100191,china State key laboratory of Virtual Reality technology and Systems Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China

High level architecture(HLA) is the prevailing standard for modeling and *** data distribution management(DDM) service of HLA is defined for reducing the delivery of irrelevant *** key in DDM implementation is the region overlap computation,*** matching between update and subscription *** algorithms usually make a compromise between region fidelity and network *** paper takes both the matching algorithm efficiency and bandwidth cost into *** main contributions are:1) illustrating the relationship between region changes and overlap changes,as helps reduce the number of region matching and then improves the total matching efficiency;2) classifying region updates into two types of data expression,snapshot and *** network traffic will be reduced by transmitting only residual data instead of full region representations ***,a region matching algorithm called displacement residual-based DDM matching(DRBM) is proposed in the *** analysis,algorithm implementation and experiment evaluation are *** results show that DRBM provides better matching performance and significant network payload reductions especially when there is a large number of changing regions.

关键词： distributed simulation high level architecture data distribution management region snapshot region residual

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Self-healing routing: failure,modeling and analysis

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Science china(information Sciences) 2011年第3期54卷 609-622页

作者： XU MingWei 1,2 , LI Qi 1,2 , YANG Yuan 1,2 , HOU MeiJia 1,2 & PAN LingTao 1,2 1 Department of Computer Science, Tsinghua University, Beijing 100084, china 2 Tsinghua National laboratory for information Science and technology (TNList), Beijing 100084, china Department of Computer Science Tsinghua University Beijing China Tsinghua National laboratory for information Science and technology (TNList) Beijing China

network failures occur frequently, and self-healing ability of existing routing protocols cannot guarantee fast route convergence under these failures without impacting packet forwarding. During routing convergence, network routes may be incorrect and even routing black holes and loops occur, which will result in extensive packet loss and thus influence network performance. To solve this problem, several improved routing solutions have been proposed. In this paper, we propose the concept and model of self-healing routing and analyze the key problems in current intra-domain and inter-domain self-healing routing protocols after briefly reviewing the characteristics of network failures. We classify the different self-healing solutions into two categories based on their design principles: routing restoration and routing protection, and systematically analyze these different typical solutions. Finally, we discuss several key issues in self-healing routing and propose a hybrid protection and restoration based routing scheme.

关键词： failure intra-domain routing inter-domain routing self-healing routing

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Preparation of nanocrystalline BaTiO_3 ceramics

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Science china(Technological Sciences) 2009年第6期52卷 1730-1734页

作者： DENG XiangYun1,2,LI DeJun1,LI JianBao2,WANG XiaoHui3 & LI LongTu3 1 College of Physics and Electronic information,Tianjin Normal University,Tianjin 300387,china 2 Materials and Chemical Engineering Institute,key laboratory for Hainan Advantage Resources and Applied technology in Chemical Engineering Material of Ministry of Education,Hainan provincial key laboratory of Research on Utilization of Si-Zr-Ti,Hainan University,Haikou 570228,china 3 Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,china College of Physics and Electronic information Tianjin Normal University Tianjin China Materials and Chemical Engineering Institute Key Laboratory for Hainan Advantage Resources and Applied Technology in Chemical Engineering Material of Ministry of Education Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Hainan University Haikou China Department of Materials Science and Engineering Tsinghua University Beijing China

The high-dense nanocrystalline BaTiO3(BT)ceramics with grain size smaller than 100nm have been successfully prepared by the two step sintering and the spark plasma sintering(SPS)*** successive transitions in nanograin BT ceramics from rhombohedral to orthorhombic,tetragonal and cubic transitions,similar to those in coarse BT ceramics,were revealed by in-situ temperature dependent Raman *** multiphase coexistence and the diffused phase transition character were demonstrated in the 8nm nanocrystalline BT ceramics.

关键词： nanocrystalline BaTiO3 ceramics preparation microstructure size effect

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A study on volunteer augmentation navigation technology

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Science china(Physics,Mechanics & Astronomy) 2011年第6期54卷 1029-1034页

作者： WU HaiTao 1,2,LU XiaoChun 1,2,ZOU DeCai 1,2 & HAN Tao 1,2 1 National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,china 2 key laboratory of Precision Navigation and Timing technology,Chinese Academy of Sciences,Xi’an 710600,china National Time Service Center Chinese Academy of Sciences Xi’an China key laboratory of Precision Navigation and Timing technology Chinese Academy of Sciences Xi’an China

Navigation augmentation technology is one of the most common methods to increase the continuity,reliability and integrity of the global satellite navigation *** concept of volunteer augmentation navigation (VNA) is proposed and the elements and topological structure of VNA are also analyzed in this *** study focuses on the neural network model that volunteers and ordinary users use modern communication information network to exchange self-organizing *** neural cell model of Volunteer Augmentation Navigation using shared information is *** interactive general relative positioning is *** basic theories and methods of volunteer augmentation navigation are formed on the basis of the above-mentioned *** study of realization mechanism of volunteer augmentation technology helps to form a relatively integral architecture of volunteer augmentation navigation.A user self-service satellite navigation augmentation which combines information exchange and navigation services may strengthen the continuity,reliability and integrity of the navigation *** volunteer augmentation navigation theory proposed in this paper improves the traditional satellite navigation application model and expands the connotation and denotation of satellite navigation augmentation methods.

关键词： volunteer augmentation navigation self-organizing information exchange interactive general relative positioning

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Another ID-Based Proxy Signature Scheme and Its Extension

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Wuhan University Journal of Natural Sciences 2007年第1期12卷 33-36页

作者： ZHANG Jianhong1,2 , ZOU Wei3 1. College of Science, North china University of technology, Beijing 100041,china 2. Institute of Software of Chinese Academy of Sciences /State key laboratory of information Security, Beijing 100080, china 3. Institute of Computer Science and technology, Peking University, Beijing 100871, china College of Science North China University of Technology Beijing China State key laboratory of information Security Institute of Software of Chinese Academy of Sciences Beijing China Institute of Computer Science and technology Peking University Beijing China

So fur, the security of many proxy signatures has seldom been considered in a formal way and most of them cannot satisfy nonepudiation. In this work, a novel ID-based （Identity-based） proxy signature scheme is proposed by combining the proxy signature with ID-based public cryptography, and they formalize the notion of security for ID-based proxy signature schemes. And show that the security of the proposed scheme is secure. Compured with other proxy signature schemes, it does not need a secure channel. Thus, it is particularly suitable for the unreliable network computation environment. Finally, they extend proposed scheme to a proxy multi-signature which has the following advantages （1） the size of proxy multi- signature is independent of the number of delegating users; （2） the computation cost of proxy multi-signature only need two Weil paring.

关键词： proxy signature multisignature security proof

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