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Asia-Pacific Conference on Microwave

作者： Ming-Sheng Chen Xian-Liang Wu Wei Sha Zhi-Xiang Huang Department of Physics and Electronic Engineering Hefei Teachers College Hefei Anhui China Key Laboratory of Intelligent Computing & Signal Processing Anhui University Hefei Anhui China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

In this paper, a similar but novel method presented in [3, 4], lifting wavelet-like transform (LWLT), is applied to the FMM method to sparsify the aggregation and disaggregation matrix. By compressing the elements in those two matrices in time, the method proposed can further speed up the MVM and save much memory when the FMM is used. Numerical results for different shaped three-dimensional objects are considered. Compared with the FMM technique, the application of the LWLT to the FMM can accelerate the MVM by factor of two with lower memory consumed.

关键词： Wavelet transforms Sparse matrices Equations Message-oriented middleware Educational institutions Laboratories Physics computing signal processing Moment methods Computational electromagnetics

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Optimized symplectic scheme for electromagnetic simulations

Optimized symplectic scheme for electromagnetic simulations

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Asia-Pacific Conference on Microwave

作者： Bo Wu Zhi-Xiang Huang Wei Sha Ming-Sheng Chen Hong Dai School of physical science and technology Yunnan University China Key Laboratory of Intelligent Computing & Signal Processing Anhui University China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China Department of Physics and Electronic Engineering Hefei Teachers College China

Classical finite-difference time-domain (FDTD) method has been widely used in computational electromagnetics, but for electrically large domains and for late-time analysis, FDTD method begins to show its limitations due to the accumulation of phase errors. To solve this problem, several methods have been proposed such as high-order schemes and four-stage Runge-Kutta integrator. Recently, the symplectic methods have been adopted for using in computational electromagnetics. In this paper, the concentration is on the derivation of an optimized fourth-order symplectic scheme in electromagnetic simulations.

关键词： Computational modeling Finite difference methods Permittivity Permeability Maxwell equations Electromagnetic propagation Differential equations Optimization methods Physics computing signal processing

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A Direct-Path Interference Cancellation Approach to Passive Radar Based on Adaptive Fractional Delay Estimation

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电子学报(英文版) 2007年第2期16卷 359-362页

作者： ZHU Jiabing WU Xianliang TAO Liang HONG Yi Education Ministry Key Laboratory of Intelligent Computing and Signal Processing Anhui University Hefei 230039 China Institute of Signal Processing East China Research Institute of Electronic Engineering Hefei 230031 China

Target detection by non-cooperative illuminator is a study hotspot in electronic warfare field, with'four countering' potential advantages for passive radar. One of the major problems in continuous wave bistatic radar is Direct path interference (DPI). Conventional solutions to this problem is the use of an adaptive antenna, steering null towards the interference. Unfortunately the null depth obtained by this technology is not enough for surveillance radar. First of all, DPI appeared in passive radar based on non-cooperative FM broadcast transmitter is analyzed in this paper. Secondly, a DPI cancellation based on Adaptive fractional delay estimation (AFDE) is in detail introduced how to deal with this problem. Finally, a passive radar experimental system based on non-cooperative FM broadcast transmitter is provided, simulation results by real collected data show applying the method proposed in this paper is effective in suppression DPI.

关键词：无源雷达直达波干扰对消自适应分数延迟估计 FM广播

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A method of multi-user detection based on independent component analysis for DS-CDMA systems

A method of multi-user detection based on independent compon...

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IET Conference on Wireless, Mobile and Sensor Networks 2007, CCWMSN'07

作者： Li, X.H. Gao, W. Cheng, Y. Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei 230039 China

ISBN: (纸本)9780863418365

The DS-CDMA signal model and the noisy linear Independent Component Analysis (ICA) model are analyzed in this paper. Comparing these models shows that they have the same form. The adaptive minimum mean-square error (MMSE) multiuse detection based on ICA is proposed. It uses the output of adaptive MMSE multi-user detection to initialize the ICA iterations, not only the known spread information of interesting user is used to overcome the uncertainness of ICA, but also the character of statistical independence is used. The simulation results show that the performance is improved obviously.

关键词： Mean square error

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Learning methods of constructive neural network

Learning methods of constructive neural network

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2007 International Conference on Artificial intelligence and Pattern Recognition, AIPR 2007

作者： Zhao, Liquan Zhang, Ling Province Key Laboratory of Electronic Business Nanjing University of Finance and Economics Nanjing 210003 China Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Anhui University Hefei 230039 China Artificial Intelligence Institute Anhui University Hefei 230039 China

ISBN: (纸本)9781615677214

Learning methods of constructive neural network aims to overcome the disadvantages of BP algorithm, which has many advantages such as fast convergent rate, less computation, good fault-tolerant and strong generalization ability, etc. Its structure is constructed step by step in the processing of the data rather than being prescribed in advance. This paper mainly introduces the developing motivations, research status quo and development directions, laying stress on two kinds of constructive learning methods: FP algorithm and covering algorithm. After discussing the construction and basic properties of FP network, we construct an FP network as a general clustering unit, and analyze its main properties. On the base of summarizing covering algorithm we present a general neighborhood covering algorithm and its corresponding network. According to the characteristics of the algorithm we analyze its existing problems and propose the further research orientations.

关键词： Pattern recognition

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Global synchronization of delayed chaotic neural networks based on LMI approach

Global synchronization of delayed chaotic neural networks ba...

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2007 IEEE International Conference on Control and Automation, ICCA

作者： Qiao, Zong-Min Cheng, Jia-Xing Song, Jie Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China Department of Mathematics Hefei Normal University Hefei China

ISBN: (纸本)1424408180

In this paper, global synchronization approach is discussed for chaotic neural networks with time-varying delay. Under the feedback control of nonlinear state coupling, an effective control law in matrix inequality form has been derived for time-varying delayed chaotic neural networks based on Lyapunov method and LMI technique. The advantage of the proposed approach can be performed efficiently via numerical algorithms such as the interior-point algorithms for solving LMIs. Numerical simulations are carried out to demonstrate the effectiveness of the established synchronization law. © 2007 IEEE.

关键词： Neural networks

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A SYNCHRONIZATION APPROACH OF DELAY CHAOTIC NEURAL NETWORKS

A SYNCHRONIZATION APPROACH OF DELAY CHAOTIC NEURAL NETWORKS

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2007 International Conference on Machine Learning and Cybernetics(IEEE第六届机器学习与控制论国际会议)

作者： ZONG-MIN QIAO JIE SONG JIA-XING CHENG Key Laboratory of intelligent Computing and Signal Processing Ministry of Education Anhui Universi Key Laboratory of intelligent Computing and Signal Processing Ministry of Education Anhui Universi

In this paper, global synchronization is discussed for chaotic neural networks time-varying *** effective synchronization law in matrix inequality form has been derived for time-varying delayed chaotic neural networks based on Lyapunov method and LMI *** advantage of the proposed approach can be performed efficiently via numerical algorithms such as the interior-point algorithms for solving ***, one can get two less conservative controller gain matrixes simultaneous by solving a *** simulations are carried out to demonstrate the effectiveness of the established synchronization laws.

关键词： Chaotic system Delay Synchronization

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Bearing vibration signal analysis based on chirplet transform

Bearing vibration signal analysis based on chirplet transfor...

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2007 8th International Conference on Electronic Measurement and Instruments, ICEMI

作者： Gao, Qingwei Lu, Yixiang Zhao, Yanfei Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei 230039 China Institute of Electronic Science and Technology Anhui University Hefei 230039 China

ISBN: (纸本)1424411351

A method based on the fast adaptive chirplet transform is presented for bearing vibration signal analysis. Based on parameters coarse estimation, it converts multi-dimension optimization process to a traditional curve-fitting problem. This method is not only free of cross-term interference, but also maintains good time-frequency resolution. In addition, as a result of fewer inner product calculations are conducted, the computational speed is fast and parameters estimation is more accurate. The experimental results show that the algorithm can efficiently extract the time-frequency characteristics of the fault signals, and the effect is better than other time-frequency methods. Therefore, it is an efficient fault diagnosis method. © 2007 IEEE.

关键词： Vibration analysis

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Improved algorithm for reduced spatial resolution video transcoding

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Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology 2007年第8期29卷 1900-1902页

作者： Li, Xiao-Hui Key Laboratory of Intelligent Computing and Signal Processing School of Electronic Science and Technology Anhui University Hefei 230039 China

An algorithm of improved reduced spatial resolution video transcoding is proposed in this paper. An adaptive intra-refresh scheme is presented based on the relation between drift error and motion activity of inter-coded blocks. The thresholds are dynamically adjusted according to the difference between the target bit rate and actual bit rate. This method can reduce the bit rate of intra coded frames while still maintaining error robustness and limiting temporal propagation of errors. Besides, a linear rate control strategy is also present. In order to reduce computational complexity, the rate-distortion function can be mapped into a linear function. The simulation results show that the buffer fullness tend to be stabilized and the PSNR of the reconstructed image is raised.

关键词： Video streaming

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A (t, n)-threshold verified multi-secret sharing scheme based on ECDLP

A (t, n)-threshold verified multi-secret sharing scheme base...

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SNPD 2007: 8th ACIS International Conference on Software Engineering, Artificial intelligence, Networking, and Parallel/Distributed computing

作者： Runhua, Shi Hong, Zhong Liusheng, Huang Key Laboratory of Intelligent Computing and Signal Processing Anhui University Ministry of Education Hefei 230039 China Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 China

ISBN: (纸本)0769529097

In this article, we propose a (t,n) threshold verifiable multi-secret sharing scheme, in which to reconstruct t secrets needs to solve t simultaneous equations. The analysis results show that our scheme is as easy as Yang's scheme [8] in the secret reconstruction and requires less public values than Chien's [7] and Yang's schemes. Furthermore, the shares in our scheme can be verified their validity with t public values based on ECDLP, and there are two verified forms: one is computationally secure as Feldman 's scheme [12] and other is unconditionally secure as Pedersen 's scheme [13]. In addition, for the main computation: ai,1P1 + ai,2P2 + + ai,tPt in our scheme, we present a new method based on the signed factorial expansion and implement it, the results show that it is more efficient than the current public methods. Thus our scheme is a secure and efficient (t,n) threshold verified multi-secret sharing scheme. © 2007 IEEE.

关键词： Threshold logic

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