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6th International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing, IMIS 2012

作者： Zhao, Jinjing Wen, Yan Li, Xiang Peng, Wei Zhao, Feng Beijing Institute of System Engineering Beijing China National Key Laboratory of Science and Technology on Information System Security Beijing China Beijing Aerospace Control Center Beijing China National University of Defense Technology Computer School Changsha China

ISBN: (纸本)9780769546841

Border Gateway Protocol (BGP) is the de facto inter-domain routing protocol. There have been many incidents of IP prefix hijacking by BGP protocol in the Internet. Attacks may hijack victim's address space to disrupt network services or perpetrate malicious activities such as spamming and DoS attacks without disclosing identity. The relation on prefix hijacking and the Internet hierarchy is presented in this paper. The Internet is classified into three hierarchies based on the power-law and commercial relations of autonomous systems. The relation of network topology and prefix hijacking influence is presented for all sorts of hijacking events in different layers. The result shows that the hierarchical nature of network influences the prefix hijacking greatly. © 2012 IEEE.

关键词： Border Gateway Protocol

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Poster abstract: Direct multi-hop time synchronization with constructive interference

Poster abstract: Direct multi-hop time synchronization with ...

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International Symposium on information Processing in Sensor Networks (IPSN)

作者： Yin Wang Gaofeng Pan Zhiyu Huang MOE Key Lab for Information System Security TNLIST Tsinghua University Science and technology on communication information security control laboratory Chinese Academy of Sciences

ISBN: (纸本)9781479964703

Multi-hop time synchronization in wireless sensor networks (WSNs) is often time-consuming and error-prone due to random time-stamp delays for MAC layer access and unstable clocks of intermediate nodes. Constructive interference (CI), a recently discovered physical layer phenomenon, allows multiple nodes transmit and forward an identical packet simultaneously. By leveraging CI, we propose direct multihop (DMH) time synchronization by directly utilizing the time-stamps from the sink node instead of intermediate n-odes, which avoids the error caused by the unstable clock of intermediate nodes. DMH doesn't need decode the flooding time synchronization beacons. Moreover, DMH explores the linear regression technique in CI based time synchronization to counterbalance the clock drifts due to clock skews.

关键词： Synchronization Clocks Protocols Accuracy Interference Wireless sensor networks Relays

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Non-negative matrix factorization based on double sparsity K-SVD

Non-negative matrix factorization based on double sparsity K...

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第三届数字制造与自动化国际会议

作者： Zheng Hong Li Zhen Li Zhao School of Automation Science and Electrical Engineering Beihang University Science and Technology on Electro-Optical Information Security Control Laboratory

This paper presents a novel non-negative matrix factorization algorithm based on double sparsity K-SVD. It keeps the good parts-based representation. And meanwhile it has a well sparsity as sparse coding. The influences given by different initialization condition have been successfully overcome. Compared with other algorithms, the algorithm proposed is much faster. This dissertation demonstrates the advantages of the proposed algorithm by simulator experimentation.

关键词： double sparisity K-SVD non-negative matrix factorization

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Mechanism analysis of protocols based on the FPCPN model

Journal of Digital Information Management

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Journal of Digital information Management 2012年第2期10卷 86-93页

作者： Wang, Wei Science and Technology on Communication Information Security Control Laboratory China No. 36 Research Institute of CETC Jiaxing Zhejiang 314001 China

Focusing on the protection of privacy and non- publicity of special networks, the CPN model is extended to PCPN by the protocol factor and the formal model. The FPCPN (Formal Protocol Colored Petri Net) is presented to analyze the operation mechanism of protocols. It is introduced by four steps, such as the whole structure, the network element conversion, the conditions of transition triggers/executions and sub-system partitions. Finally, the feasibility and efficiency of FPCPN is validated by an example.

关键词： Petri nets

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A novel miniaturized band-pass frequency selective surface

A novel miniaturized band-pass frequency selective surface

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2012 5th Global Symposium on Millimeter-Waves, GSMM 2012

作者： Li, Wanlu Yang, Guohui Zhang, Tong Wu, Qun Hua, Jun Chen, Meiliang Gu, Xuemai School of Electronics and Information Technology Harbin Institute of Technology Harbin 150001 China Department of Microwave Engineering Key Laboratory No.92 West Dazhi Street Harbin 150001 China Fu Foundation School of Engineering and Applied Science Columbia University 116th Street and Broadway New York NY 10027 United States Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang Province 314033 China

ISBN: (纸本)9781467313032

In this paper, a novel band-pass miniaturized FSS is proposed, in which a unit cell consists of four spiral etched slot lines arranged central-symmetrically on a dielectric substrate, and the spiral elements are placed interlaced so that each element is connected to an adjacent one in another unit cell. Simulation results show the FSS has the dimension of a unit cell only 0.060λx0.060λ, where λ represents the wavelength corresponding to the resonant frequency. And the miniaturization is stable with respect to different polarizations and incident angles. Prototype of the FSS is fabricated and tested. The measured results show very good agreement with simulated ones. © 2012 IEEE.

关键词： Frequency selective surfaces

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A design of Rotman lens for phase antenna array

A design of Rotman lens for phase antenna array

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Wan Chen Jiahui Fu Qun Wu Jun Hua Department of Electronics and Communication Engineering Harbin Institute of Technology Harbin Heilongjiang China Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang China

In this work, a wide banded planar multi-input/output port Rotman lens for phase array antennas is investigated by simulation. The Rotman lens consists of lens and delay lines. With essential parameters, the outline of the lens is calculated by Matlab, in this way we can design a Rotman lens with certain functions, also the model is constructed by simulation software with the data imported from Matlab. The lens consists of the lens and the delay line. A useful segmented design of the delay line is applied to improve the transmission efficiency. A principle for dumpy port design is raised to improve the output characteristics. By this way, the magnitude error of different frequency is limited within 3 dB and below 5 dB when the port is changed. The lens offers a phase shift from -70 degree to +70 degree with a changeable step.

关键词： Lenses Arrays Delay lines Mathematical model Antenna arrays MATLAB Equations

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Detecting and adapting to drifting concepts

Detecting and adapting to drifting concepts

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Haixia Chen Shengxian Ma Kai Jiang Science and Technology on Electro-optical Information Security Control Laboratory Beijing China The 45th Research Institute of CETC Beijing China

The importance of incremental learning in changing environments has been acknowledged in recent years. In this paper we present an ensemble learning method for supervised learning with drifting concepts. The method employs hypothesis test as mechanism for detecting concept drift and learns a base classifier for each new training data chunk. Former classifiers deemed as usable by the hypothesis test mechanism and the new classifiers are integrated to form the final classifiers ensemble for prediction. The main focus of the work is to identify the usability of base classifiers that representing the same or similar concept with the current one, make full use of the older valid information together with the newer examples to improve classification accuracy, and avoid the interference of classifiers representing conflictive concepts with the current one. Experiments with simulated concept drift scenarios compared the proposed method with other approaches. The results showed that the method could consistently recognize different types of drift, adapt quickly to these changes to maintain its performance level, and utilize the former knowledge to improve its performance for recurring context.

关键词： Classification algorithms Accuracy Training Learning systems Error analysis Machine learning Data mining

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Classification of incomplete data using classifier ensembles

Classification of incomplete data using classifier ensembles

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International Conference on Systems and Informatics (ICSAI)

作者： Haixia Chen Yuping Du Kai Jiang Science and Technology on Electro-optical Information Security Control Laboratory Beijing China The 45th Research Institute of CETC Beijing China

This paper proposes a method for classification of incomplete data using neural network ensembles. In the method, the incomplete data set is analyzed and projected into a group of complete data subsets that give a full description of the known values in the data set by joining together. Those complete data subsets are then used as the training sets for the neural networks. Base classifiers are selected and integrated according to their classification accuracies and the support degrees of their training data sets to give the final predication. Compared with other methods dealing with missing data in classification, the proposed method can utilize all the information provided by the incomplete data, maintain maximum consistency of the incomplete data set and avoid the dependency on distribution or model assumptions. Experiments on two UCI datasets showed the superiority of the algorithm to other two typical treatments of missing data in ensemble learning.

关键词： Neural networks Classification algorithms Accuracy Data models Training data Machine learning Bagging

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Identification of radio communication source with multi-object optimization

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Yingyong Kexue Xuebao/Journal of Applied sciences 2012年第6期30卷 559-565页

作者： Tang, Zhi-Ling Yang, Xiao-Niu Li, Jian-Dong School of Communication Engineering Xidian University Xi'an 710071 China School of Electronic Engineering and Automation Guilin University of Electronic Technology Guilin 541004 Guangxi Province China Science and Technology on Communication Information Security Control Laboratory Jiaxing 314033 Zhejiang Province China

To identify personality of a radio signal, a new method of multi-object optimization is proposed to solve a system of high order cumulants equations. The power amplifier model is first shown to be equivalent to a multi-input single-output system. A system of equations is derived from the cumulant relation between input and output. The system is solved with multi-object genetic optimization to obtain the features. The system of equations is verified by simulation, and the results of estimation are compared with computed values, showing that the proposed method can extract features from the received signal only with minor errors.

关键词： Radio communication

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Recovering geometric detail by octree normal maps

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2012年 7145 LNCS卷 62-73页

作者： Fan, Wenshan Wang, Bin Chan, Bin Paul, Jean-Claude Sun, Jiaguang School of Software Tsinghua University China Beijing Aerospace Control Center China Department of Computer Science and Technology Tsinghua University China Key Laboratory for Information System Security Ministry of Education China Tsinghua National Laboratory for Information Science and Technology China University of Hong Kong Hong Kong INRIA France

ISBN: (纸本)9783642290497

This paper presents a new approach for constructing normal maps that capture high-frequency geometric detail from dense models of arbitrary topology and are applied to the simplified version of the same models generated by any simplification method to mimic the same level of detail. A variant of loose octree scheme is used to optimally calculate the mesh normals. A B-spline surface fitting based method is employed to solve the issue of thin plate. A memory saving Breadth-First Search (BFS) order construction is designed. Furthermore, a speedup scheme that exploits access coherence is used to accelerate filtering operation. The proposed method can synthesize good quality images of models with extremely high number of polygons while using much less memory and render at much higher frame rate. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Graphics processing unit

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