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International Conference on Information Science and technology (ICIST)

作者： XinSheng Ji XiaoLei Kang KaiZhi Huang KeMing Ma China National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan P.R. China China Nat. Digital Switching Syst. Eng. & Technol. R&D Center Zhengzhou China

ISBN: (纸本)9781467327626

The method of physical layer security in wireless relay communication based on cooperative jamming scheme need the channel of legitimate user keep constant. It fails if the eavesdropper has more antennas than the sender. To solve this problem, this paper proposes a second-order spatial hopping transmission scheme. The sender, by the antenna switching and the hopping spatial pattern (HSP), forms equivalent spatial channel of the first-order; Acting as a virtual multi-antenna receivers, relays use time-varying coefficient of beam-forming to weighted-and-forward, form equivalent spatial channel of the second-order. Simulation results show that the scheme proposed achieves low probability of intercept (LPI) in eavesdropper and the power consumption is lower than the method of cooperative jamming.

关键词： relays Antennas Jamming Switches Security Physical layer Bit error rate

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An affinity propagation algorithm base on self-tuning kernel geodesic distance

An affinity propagation algorithm base on self-tuning kernel...

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International Conference on Information Science and technology (ICIST)

作者： Jianpeng Zhang Fucai Chen Lixiong Liu dongdong Niu Department of China National Digital switching System Engineering & Technological R & D Center Zhengzhou Henan

For affinity propagation algorithm, traditional Euclidean distance measure cannot fully reflect the complex spatial distribution of the data sets. We propose a self-tuning kernel geodesic distance as the similarity measure which can reflect the inherent manifold structure information effectively. Meanwhile, according to the neighborhood density of the data sets, it identifies and eliminates the influence of boundary noise effectively, the results show that the improved algorithm has higher accuracy and better robustness for data with manifold distribution, multi-scale and noise overlap.

关键词： Clustering algorithms Manifolds Kernel Noise Level measurement Euclidean distance Algorithm design and analysis

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Audio sensing aid based wireless microphone emulation attacks detection

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Telkomnika - Indonesian Journal of Electrical engineering 2013年第10期11卷 5917-5928页

作者： Shan-Shan, Wang Xing-Guo, Luo Bai-Nan, Li National Digital Switching System Engineering and Technological R and D Center Jinshui Zhengzhou 450001 China

The wireless microphone network is an important PU network for CrN, but there is no effective technology to solve the problem of microphone evaluation attacks. Therefore, this paper propose ASA algorithm, which utilizes three devices to detect MUs, and they are loudspeaker audio sensor (LAS), environment audio sensor (EAS), and radio frequency fingerprint detector (rFFd). LASs are installed near loudspeakers, which have two main effects: One is to sense loudspeakers' output, and the other is to broadcast warning information to all SUs through the common control channel when detecting valid output. EASs are pocket voice captures provided to SU, and utilized to sense loudspeaker sound at SU's location. Utilizing EASs and energy detections in SU can detect primary user emulation attack (PUEA) fast. But to acquire the information of attacked channels, we need explore rFFds to analyze the features of PU transmitters. The results show that the proposed algorithm can detect PUEA well. © 2013 Universitas Ahmad dahlan.

关键词： Loudspeakers

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Primary User Emulation Attacks Analysis for Cognitive radio Networks Communication

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Telkomnika - Indonesian Journal of Electrical engineering 2013年第7期11卷 3905-3914页

作者： Wang, Shan-Shan Luo, Xing-Guo Li, Bai-Nan National Digital Switching System Engineering Technological R and D Center Jinshui Zhengzhou 450001 China

Cognitive radio Network is an effective technology and a hot research direction which can solve the problem of deficient resource and revolutionize utilization. And its safety technology attracts more and more researches. Primary user emulation attacks (PUEAs) are typically easy and largely affecting. PUEAs come from both malicious misbehavior secondary users (MMUs) and selfish misbehavior secondary users (SMUs). The former is studied much more deeply than the later one. distinguishing MMU and SMU, we propose a Four dimensional Continuous Time Markov Chain model to analyze the communication performance of normal secondary users under PUEAs, and typically affected by SMUs. Furthermore, we compare several PUEA detection schemes. The emulation results indicate that the SMU detection mechanism is essential for the PUEA detection schemes, which can improve the detection effects largely. © 2013 Universitas Ahmad dahlan.

关键词： Cognitive radio

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An analysis of the radar backscatter from oil-covered sea surfaces using moment method and Monte-Carlo simulation: preliminary results

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Acta Oceanologica Sinica 2013年第1期32卷 59-67页

作者： YANG Chan-Su PArK Seong-Min OH Yisok OUCHI Kazuo Korea Ocean Satellite Center Korea Institute of Ocean Science & Technology (KIOST) Marine Environmental System Science University of Science and Technology ISR R&D Laboratory LIG Nex1 Company Department of Electronics Information and Communication Engineering Hongik University Department of Computer Science School of Electrical and Computer Engineering National Defense Academy

An analysis of the radar backscattering from the ocean surface covered by oil spill is presented using a mi- crowave scattering model and Monte-Carlo simulation. In the analysis, a one-dimensional rough sea sur- face is numerically generated with an ocean waveheight spectrum for a given wind velocity. A two-layered medium is then generated by adding a thin oil layer on the simulated rough sea surface. The electric fields backscattered from the sea surface with two-layered medium are computed with the method of moments （MoM）, and the backscattering coefficients are statistically obtained with N independent samples for each oil-spilled surface using the Monte-Carlo technique for various conditions of surface roughness, oil-layer thickness, frequency, polarization and incidence angle. The numerical simulation results are compared with theoretical models for clean sea surfaces and SAr images of an off-spilled sea surface caused by the Hebei （Hebei province, China） Spirit oil tanker in 2007. Further, conditions for better oil spill extraction are sought by the numerical simulation on the effects of wind speed and oil-layer thickness at different inci- dence angles on the backscattering coefficients.

关键词： method of moments Monte-Carlo technique oil spills backscattering coefficient

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Iterative algorithm for retweeting prediction in Twitter

Iterative algorithm for retweeting prediction in Twitter

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International Conference on Information Science and technology (ICIST)

作者： Yingle Li Zhen Wu Hongtao Yu Lixiong Liu National Digital Switching System Engineering & Technological R&D Center Zhengzhou 450002 Henan China National Computer Network and Information Security Administration Center Beijing 100031 China

ISBN: (纸本)9781467327626

Twitter is emerging social media. There is an important practical significance to study its communication effect in many aspects of the Marketing Management, Public Sentiment, Hot Extraction and so on. The retweeting scale is an important indicator to reflect the communication effect. Based on analyzing the factors, a prediction algorithm based on SVM was proposed for retweeting with five features: publisher influence, acceptor activity, interest level, content importance and intimacy. Furthermore, the prediction algorithm for retweeting scale was proposed based above, the method to evaluate the prediction accuracy was given. At last the experiment with Twitter data showed a good result that the prediction accuracy of retweeting scale was up to 86.63%.

关键词： Prediction algorithms Twitter Accuracy Classification algorithms Media Feature extraction Support vector machines

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A Logic-Based Safety Analysis Algorithm for discretionary Access Control

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Wuhan University Journal of Natural Sciences 2012年第6期17卷 531-538页

作者： YAN Xuexiong WANG Qingxian ZHU Junhu XI Qi National Digital Switching System Engineering and Technological R&D Center Zhengzhou 450002HenanChina

For the issue of the discretionary access control（dAC） model safety analysis,a logic method is *** method takes the Gd model as the classic dAC model and Prolog as the basic language to describe system states and state transfer rules.A general program based on this logic method is proposed for dAC safety analysis,but this program may never be terminal for some safety analysis *** safety analysis algorithm is achieved by simplifying the general program according to the property of the dAC model state transfer *** safety analysis algorithm is easier to understand and implement than the previous algorithms and its time complexity is O（N＋M＋T）,in which N,M,and T are the numbers of the rights with copy flag,the policies for right transferring,and the policies for right permitting,respectively.

关键词： discretionary access control（dAC） safety analysis logic state transfer

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An immune-theory-based model for monitoring inter-domain routing system

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Science China(Information Sciences) 2012年第10期55卷 2358-2368页

作者： GUO Yi & WANG ZhenXing national digital switching system engineering & Technological r&d center,Zhengzhou 450002,China 1. National Digital Switching System Engineering & Technological R & D Center Zhengzhou 450002 China

The inter-domain routing system faces many serious security threats because the border gateway protocol(BGP) lacks effective security ***,there is no solution that satisfies the requirements of a real *** address this problem,we propose a new model based on immune theory to monitor the inter-domain routing *** introduce the dynamic evolution models for the "self" and detection cells,and construct washout and update mechanisms for the memory detection ***,borrowing an idea from immune network theory,we present a new coordinative method to identify anomalous nodes in the inter-domain routing *** this way,the more nodes working with their own information that join the coordinative network,the greater is the ability of the system to identify anomalous nodes through evaluation between *** it is not necessary to modify the BGP,the ITMM is easy to deploy and inexpensive to *** experimental results confirm the method’s ability to detect abnormal routes and identify anomalous nodes in the inter-domain routing system.

关键词： border gateway protocol inter-domain route immune theory anomalous node coordinative identification

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Achieving fair service with a hybrid scheduling scheme for CICQ switches

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Science China(Information Sciences) 2012年第3期55卷 689-700页

作者： HU HongChao , GUO YunFei, YI Peng & LAN JuLong department of Broadband Information Networks, national digital switching system engineering & Technological r&d center (NdSC), Zhengzhou 450002, China 1. Department of Broadband Information Networks National Digital Switching System Engineering & Technological R&D Center (NDSC) Zhengzhou 450002 China

Providing performance guarantees for arriving traffic flows has become an important measure for today’s routing and switching systems. However, none of current scheduling algorithms built on CICQ (combined input and cross-point buffered) switches can provide flow level performance guarantees. Aiming at meeting this requirement, the feasibility of implementing flow level scheduling is discussed thoroughly. Then, based on the discussion, it comes up with a hybrid and stratified fair scheduling (HSFS) scheme, which is hierarchical and hybrid, for CICQ switches. With HSFS, each input port and output port can schedule variable length packets independently with a complexity of O(1). Theoretical analysis show that HSFS can provide delay bound, service rate and fair performance guarantees without speedup. Finally, we implement HSFS in SPES (switch performance evaluation system) to verify the analytical results.

关键词： switching fabric scheduling policy load balancing dynamical re-routing

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Achieve load balancing with a dynamic re-routing CICQ switching scheme

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Science China(Information Sciences) 2012年第2期55卷 407-418页

作者： HU HongChao,GUO YunFei,YI Peng & LAN JuLong department of Broadband Information Networks,national digital switching system engineering & Technological r&d center(NdSC),Zhengzhou 450002,China 1. Department of Broadband Information Networks National Digital Switching System Engineering & Technological R&D Center (NDSC) Zhengzhou 450002 China

Multi-path based routing and switching can achieve network-wide load balancing and reduce the port conflicts of switching *** by this novel idea,in this paper,through analyzing the feasibility of implementing multi-next-hops in core switching networks comprehensively,we advance a switching scheme called MHrS(multi-next-hop re-routing switch)and a forwarding table management scheme called HMFT(hierarchical multi-stage forwarding table)to support multi-next-hop dynamical *** implements dynamical re-routing in the switches according its congestion status to achieve real-time load balancing,while HMFT can provide traffic with different forwarding paths based on their QoS *** analysis and simulation results show that switches equipped with HMFT and MHrS can provide good delay and throughput ***,they can reduce port conflicts significantly.

关键词： switching fabric scheduling policy load balancing dynamical re-routing

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