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IEEE International Conference on Computer-Aided Design and Computer Graphics

作者： Wenshan Fan Bin Wang Jianliang Zhou Jiaguang Sun Tsinghua University Beijing Beijing CN Key Laboratory for Information System Security Ministry of Education of China China School of Software Tsinghua University China Tsinghua National Laboratory for Information Science and Technology China Beijing AeroSpace Control Center China

We present a fast collision detection method for deformable surfaces with parallel spatial hashing on GPU architecture. The efficient update and access of the uniform grid are exploited to accelerate the performance in our method. To deal with the inflexible memory system, which makes the building of stream data a challenging task on GPU, we propose to subdivide the whole workload into irregular segments and design an efficient evaluation algorithm, which employs parallel scan and stream compaction, to build the stream data in parallel. The load balancing is a key aspect that needs to be considered in the SIMD parallelism. We break the heavy and irregular collision computation down into lightweight part and heavyweight part, ensuring the later perfectly run in load balancing manner with each concurrent thread processes just a single collision. In practice, our approach can perform collision detection in tens of milliseconds on a PC with NVIDIAGTX 260 graphics card on benchmarks composed of millions of triangles. The results highlight our speedups over prior CPU-based and GPU-based algorithms.

关键词： Graphics processing unit Computational modeling Arrays Benchmark testing Compaction Deformable models Buildings

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Lag Quasi-Synchronization of Coupled Delayed Systems With Parameter Mismatch

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IEEE Transactions on Circuits and Systems I: Regular Papers 2011年第6期58卷 1345-1357页

作者： Wangli He Feng Qian Qing-Long Han Jinde Cao Key Laboratory of Advanced Control and Optimization of Chemical Processes Ministry of Education East China University of Science and Technology Shanghai China Centre of Intelligent and Networked Systems and the School of Information and Communication Technology Central Queensland University Rockhampton QLD Australia Department of Mathematics South-East University Nanjing China

This paper is concerned with lag synchronization of two coupled delayed systems with parameter mismatch. Due to parameter mismatch, complete lag synchronization can not be achieved. Therefore, a new lag quasi-synchronization scheme is proposed to ensure that coupled systems are in a state of lag synchronization with an error level. Several simple criteria are derived and the error level is estimated by applying a generalized Halanary inequality and matrix measure. Three examples are given to illustrate the effectiveness of the proposed lag quasi-synchronization scheme. It is shown that as the coupling strength increases, the estimated error level is close to the simulated one, which well supports theoretical results.

关键词： Synchronization Measurement uncertainty Delay Linear matrix inequalities Trajectory Delay effects Couplings

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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 delay system method to design of event-triggered control of networked control systems

A delay system method to design of event-triggered control o...

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IEEE Conference on Decision and control

作者： Dong Yue Engang Tian Qing-Long Han Department of Control Science and Engineering and the Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Huazhong University of Science and Technology Hubei 430074 China School of Electrical and Automation Engineering Nanjing Normal University 78 Bancang Street Nanjing 210042 China Center for Intelligent and Networked Systems and the School of Information and Communication Technology Central Queensland University Rockhampton Qld 4702 Australia

ISBN: (纸本)9781612848006

The event-triggered H_(infinity) control design is investigated for networked control systems with uncertainties and transmission delays. A novel event-triggering scheme is proposed, which has some advantages over traditional ones with a continuous detector. Considering the effect of the transmission delay, a delay system model for the analysis is firstly constructed. Then, based on the model and Lyapunov functional method, criteria for the stability with an H_(infinity) norm bound and criteria for the co-design of both the feedback gain and the trigger parameters are derived. In order to solve the feedback gain and the trigger parameters, the linear matrix inequality technique is employed. From the simulation example, it can be concluded that the proposed event-triggering scheme is superior to some other event-triggering schemes in some existing literature.

关键词： feedback gain Networked control systems Event trigger Delay systems Scheme Co-design control systems design control

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Impulsive synchronization of two nonidentical chaotic systems with time-varying delay

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Physics Letters A 2011年第3期375卷 498-504页

作者： Wangli He Feng Qian Jinde Cao Qing-Long Han The Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai 200237 China Centre for Intelligent and Networked Systems Central Queensland University Rockhampton QLD 4702 Australia School of Information and Communication Technology Central Queensland University Rockhampton QLD 4702 Australia Department of Mathematics Southeast University Nanjing 210096 China

This Letter investigates synchronization of two nonidentical Lur'e systems with time-varying delay and parameter mismatches via impulsive control. Based on the theory of impulsive functional differential equations, sufficient conditions for impulsive synchronization with a bound on the synchronization error are derived. An illustrative example is provided to validate the proposed method.

关键词： Impulsive synchronization Impulsive control Nonidentical chaotic systems Time-varying delay

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A stop and go blind equalization algorithm for QAM signals

A stop and go blind equalization algorithm for QAM signals

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International Conference on Wireless communications, Networking and Mobile Computing (WiCom)

作者： Wei, Xue Xiaoniu, Yang Zhaoyang, Zhang National Laboratory of Information Control Technology for Communication System Jiaxing Zhejiang 314033 China Department of Information Science and Electronic Engineering Zhejiang Uinversity Hangzhou Zhejiang 310027 China

ISBN: (纸本)9781424437092

The constant modulus algorithm (CMA) has been widely used in the blind equalization of quadrature amplitude modulation (QAM) signals, but it has slow convergence rate and large steady state mean square error and the phase blind nature. In this paper, a modified constant modulus algorithm which incorporates a stop and go technique is proposed. The proposed algorithm can speed up convergence rate and decrease steady state mean square error and correct phase error and frequency offset simultaneously. The simulation results demonstrate the effectiveness of the proposed algorithm in improving convergence behavior and bit error rate (BER) performance. © 2010 IEEE.

关键词： Blind equalization

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A variable step size blind equalization algorithm for QAM signals

A variable step size blind equalization algorithm for QAM si...

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2010 International Conference on Microwave and Millimeter Wave technology, ICMMT 2010

ISBN: (纸本)9781424457052

The constant modulus algorithm (CMA) is one widely used algorithm for blind equalization of quadrature amplitude modulation (QAM) signals. The algorithm exhibits slow convergence rate and large steady state mean square error and the phase blind nature in comparison with the algorithms used in conventional data-aided equalization schemes. In this paper, a variable step size modified constant modulus algorithm is proposed. The proposed algorithm can achieve fast convergence rate and decrease steady state mean square error and correct phase shift and carrier frequency offset at the same time. The simulation results demonstrate the effectiveness of the proposed algorithm in improving convergence behavior and bit error rate performance. © 2010 IEEE.

关键词： Blind equalization

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A carrier recovery algorithm for high order QAM signals

A carrier recovery algorithm for high order QAM signals

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International Conference on Wireless communications, Networking and Mobile Computing

作者： Xue, Wei Yang, Xiaoniu Zhang, Zhaoyang National Laboratory of Information Control Technology for Communication System Jiaxing Zhejiang 314033 China Department of Information Science and Electronic Engineering Zhejiang Uinversity Hangzhou Zhejiang 310027 China

ISBN: (纸本)9781424437092

The carrier recovery is one key technique in the demodulation of high order quadrature amplitude modulation (QAM) signals. A carrier recovery algorithm which switches between multi-threshold polarity decision mode and decision directed mode according to the standard deviation of the frequency of numerically controlled oscillator (NCO) is proposed. The proposed algorithm can detect a proper time for the mode switch to yield lower steady state error. The simulation results demonstrate the effectiveness of the proposed algorithm in improving the performance of blind carrier recovery. © 2010 IEEE.

关键词： Quadrature amplitude modulation

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Recognition and parameter estimation of MPSK signals based on instantaneous phase difference

Recognition and parameter estimation of MPSK signals based o...

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6th International Conference on Wireless communications, Networking and Mobile Computing (WICOM)

作者： Song, Chunyun Zhan, Yi Guo, Lin National Laboratory of Information Control Technology for Communication System 2. No.36 Research Institute of CETC Zhejiang China Shanghai Acoustic Laboratory Institute of Acoustic Chinese Academy of Science Shanghai China

ISBN: (纸本)9781424437092

There many researches about modulation mode classification of the MPSK signals, but these studies pay few attentions to some especial MPSK signals such as OQPSK or pi/4QPSK. However, the signals are very important in the digital communications. The method of classification of the QPSK, OQPSK, pi/4QPSK and 8PSK has discussed in this paper, because these MPSK signals have similar constellations or spectrum. The method of the classification and parameter estimation based on the statistical and spectral characters of the instantaneous phase difference (IPD) is proposed. The simulation results of the digital signals indicate that this method is availability when the SNR is higher than 5dB.

关键词： modulation recognition parameter estimation instantaneous phase difference OQPSK pi/4QPSK

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Analyzing and correlating security events using state machine

Analyzing and correlating security events using state machin...

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10th IEEE International Conference on Computer and information technology, CIT-2010, 7th IEEE International Conference on Embedded Software and Systems, ICESS-2010, 10th IEEE Int. Conf. Scalable Computing and communications, ScalCom-2010

作者： Feng, Xuewei Wang, Dongxia Zeng, Jiemei Ma, Guoqing Li, Jin National Key Laboratory of Science and Technology on Information System Security Beijing Institute of System Engineer Beijing 100101 China Beijing Aerospace Control Center Beijing 100296 China

ISBN: (纸本)9780769541082

It is unfeasible to analyze the security events by the manual way for the security manager, because the number of the events is huge and the information contained in the events is meaningless. After analyzing the existing algorithms of security events correlation, we propose an attack scenario reconstruction technology based on state machine. The processes of attackers intruding into the cyberspace can be restored and the more comprehensive attack scenario description information will be generated using this technology. This working lets the security manager more comfy. The state machine based attack scenario reconstruction technology processes security events using clustering analysis and causal analysis concurrently, it builds a correlation state machine in memory for every attack scenario tree which is predefined by the security manager, when security events are coming, the certain state machines will process them, if the condition is satisfied, an attack scenario description information will be generated and then sent to the security manager. The correlating technology based on state machine is more timely and accurately, and at last, we use the DARPA2000 Intrusion Scenario Specific Data Sets to validate the technology, the experiment results show that it is feasible to analyze security events using the technology we proposed. © 2010 IEEE.

关键词： Managers

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