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Corrigendum to “Using fuzzy theory and information entropy for water quality assessment in three Gorges region, China” [Expert Systems with Applications 37 (3) (2010) 2517–2521]

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Expert Systems with Applications 2010年第6期37卷 4720-4720页

作者： Li Liu Jianzhong Zhou Xueli An Yongchuan Zhang Li Yang Dispatch & Communication Center Hunan Electric Power Company Hunan Province Changsha 410007 China College of Hydroelectric and Digitalization Engineering Huazhong University of Science and Technology Hubei Province 430074 Wuhan China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing 100084 China

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Analysis on influence of image quality for errors of CCD mosaics technology

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Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2009年第SUPPL.期30卷 115-119页

作者： Yang, Ling School of Measure-Control Technology and Communication Engineering Harbin University of Science and Technology Harbin 150040 China

Present application status of CCD mosaics is introduced the error type which the technology of CCD mosaic produced is analyzed. A model which can analyze influence for overlap error of CCD mosaics to image quality is built. Modulation transfer function (MTF) is used as evaluating indicator which analyzes the influences of overlap error linear error and coplane error. The emulation produced that the three kinds of error influenced the image quality linear error influence is more at one direction with the same deflection angle coplane error influence decrease with the increasing of F number. Overlap error influenced image quality of adjacent of CCD edge and reduction pixel size can decrease the influence.

关键词： Errors

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Research on Relationship Between Fractal Parameters and Compressive Stress of Metallic Gaskets

Research on Relationship Between Fractal Parameters and Comp...

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2009 International Conference on Measuring technology and Mechatronics Automation(ICMTMA 2009)(2009年检测技术与机械自动化国际会议)

作者： Xiu FENG Long WEI Feng LU Fluid Sealing Measure and Control Institute Nanjing Chemical Engineering Technical College Nanjing C Dept.of Automation Nanjing Institute of Technology Nanjing China

Metallic gasket seals are widely used in pressure vessels and piping. The failure of sealing systems is mostly caused not by the strength of flanges or bolts but by the leakage of the connections. The topography of sealing surface has a major influence on the leakage of the bolted flange connections. Based on the fraetal geometry theory, the fractal characterization of the sealing surface topography of metallic gaskets was studied. The profile curves of metallic gasket surface under different compressive stresses were measured by the AF-LI type stylus profilometer. The fractal dimension, scale coefficient and characteristic length scale of surface profiles were calculated by structure function method. The influence of the compressive stress on the fractai parameters was also analyzed. It's found that the sealing surfaces of metallic gaskets were fractal, and the fractal dimension and the scale coefficient can be used to characterize the sealing surface topography of metallic gaskets under various compressive stresses. The formulae expressing the relationship between the fractal parameters and the compressive stress were obtained by the regression analysis of the test results. The results are helpful for the study on the sealing performance of metallic gaskets.

关键词： metallic gasket fractal parameter surface topography compressive stress

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Hierarchical Clustering Tree for Organizing and Indexing of Image Database

Hierarchical Clustering Tree for Organizing and Indexing of ...

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Congress on Image and Signal Processing, CISP

作者： Zhonghua Sun Kebin Jia Gang Zhao Ping Fu Department of Electronic Information & Control Engineering Beijing University of Technology Beijing China College of Communication Engineering Jilin University Changchun China

Content-based image retrieval represents images as N-dimensional feature vectors. Similar image retrieval is computed over these high dimensional feature vectors. A sequential scan of the feature vectors for a query method is costly for a large number of images when N is high. The search time and search space can be reduced through indexing the data. In this paper we proposed a hierarchical clustering tree for building indices of the image database. Experiment shows that the hierarchical tree has the attribute of quick response time when retrieve image based on the query and also provide a convenient structure for users to browse the database.

关键词： Organizing Indexing Image databases Image retrieval Extraterrestrial measurements Multidimensional systems Information retrieval Lattices Spatial databases Vectors

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An optimal tracking control method for bilinear systems subjected to sinusoidal disturbances

An optimal tracking control method for bilinear systems subj...

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IEEE International Conference on Intelligent Computing and Intelligent Systems (ICIS)

作者： De-xin Gao Pei-pei Yang College of Communication and Control Engineering Jiangnan University WuXi China College of Automation and Electronic engineer Qingdao University of Science and Technology QingDao China

ISBN: (纸本)9781424447374

This paper considers the optimal tracking control (OTC) problem for bilinear systems affected by sinusoidal disturbances, and gives a successive approximation approach to solve analogous problems for general bilinear systems. For a given bilinear OTC problem, a sequence of linear problems is constructed, and their solutions are shown to converge to the desired solution. By iteratively solving the sequences of two-point boundary value problem, the OTC law is obtained. By comparing the error of quadratic performance indexes, we can obtain an approximate optimal disturbance rejection tracking control law. Simulations indicate the algorithm is efficient.

关键词： Optimal control control systems Nonlinear systems Automatic control Educational institutions Biological system modeling communication system control Automation Error correction Performance analysis

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A method of optical flow computation based on LUV color space

A method of optical flow computation based on LUV color spac...

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International Conference on Test and measurement (ICTM)

作者： Xuezhi Xiang Yu Peng Lei Zhang Department of Automatic Measurement Control Harbin Institute of Technology University Harbin China Information and Communication Engineering College Harbin Engineering University Harbin China

ISBN: (纸本)9781424446995

For improving accuracy of optical flow computation, we propose a new method to compute optical flow from both gray and color information. First, the Gauss filter is used to pre-filter the color image sequence. Then optical flow recovery is based on the method of neighborhood least squares using brightness information. And the weight coefficients of local neighborhood are determined by U and V channels in LUV color space. Finally, the optical flow result is filtered by median filter. The experiment results show that the proposed method produces dense optical flow field and accuracy of the results can also be improved.

关键词： Optical computing Image motion analysis Optical filters Brightness Equations Least squares methods Color Computer vision Fluid flow measurement Space technology

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A new algorithm of signal subspace based IPR for direction of arrival estimation

A new algorithm of signal subspace based IPR for direction o...

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European Conference on Microwave

作者： Yi Zhan Da-zhuang Ji National Laboratory of Information Control Technology for Communication System Jiaxing China Engineer College Air Force Engineering University Xi'an China

A novel approach of signal subspace based improved polynomial roots (SS-IPR) for direction of arrival (DOA) estimation is proposed. The new method uses signal subspace, instead of the original IPR method, to derive the coefficients of the polynomial for DOA estimation. When the number of signals is less compared with the array number, which is the most common situation in application, the computation burden and complexity can be reduced effectively. The theoretical derivation is given to formulate the new algorithm and simulations are conducted to show the validity and effectiveness of our method.

关键词： Intellectual property Direction of arrival estimation Signal processing Polynomials Covariance matrix Directive antennas Microwave antenna arrays Additive white noise AWGN Computational modeling

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The Performance Analysis of an Improved Robust Beamforming Algorithm

The Performance Analysis of an Improved Robust Beamforming A...

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WRI International Conference on communications and Mobile Computing, CMC

作者： Chun-Jing Liu Shu Zhang Feng Liu Harbin Engineering University Harbin Heilongjiang CN College of Information and Communication Engineering Harbin Engineering of Technology Harbin China National Information Control Laboratory Chengdu China

The conventional minimum variance beamformer (MVB) is known to have better resolution and much better interference rejection capability when the array steering vector is accurately known. However, the major problem of the MVB is that it lacks robustness against the unknown array steering vector errors. Therefore, diagonal loading and its extended versions have been a popular approach to improve the robustness of MVB. In this paper, we provide an improved robust MVB (RMVB) algorithm, which has been derived by enforcing a spherical uncertainty set constraint on the array steering vector. The new algorithm has reasonable computation complexity and more numerical stability. Simulation results show that the new algorithm is effective in the presence of array steering vector errors.

关键词： Performance analysis Robustness Array signal processing Uncertainty Signal processing algorithms Interference Vectors Sensor arrays Covariance matrix Mobile communication

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Boundedness and stability for the solutions of impulsive neural networks with time-varying delay

Boundedness and stability for the solutions of impulsive neu...

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International Joint Conference on Neural Networks (IJCNN)

作者： Xuyang Lou Ruliang Wang Baotong Cui College of Communication and Control Engineering Jiangnan University Wuxi China Department of Information Technology Guangxi Teachers Education University Nanning China

By employing Lyapunov functions and Razumikhin techniques, we analyze the uniform boundedness and uniform asymptotic stability for a large class of impulsive neural networks with time-varying delay. Some new criteria are obtained to ensure the uniform boundedness and uniform asymptotic stability of the impulsive neural networks. The results remove the usual assumption that the activation functions f j (ldr) are of bounded, monotonous or differential character. Moreover, the time-varying delay function is not required to be differential. Therefore, the results which are easy to check and apply in practice, extend and improve the earlier publications.

关键词： Neural networks Asymptotic stability Lyapunov method Artificial neural networks Stability analysis Delay effects Stability criteria Sufficient conditions Frequency Differential equations

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Nonlinear predictive control based on online support vector machine

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Journal of Computational Information Systems 2009年第4期5卷 1165-1170页

作者： Du, Zhiyong Wang, Xianfang Henan Mechanical and Electrical Engineering College Henan Xinxiang 453002 China Henan Institute of Science and Technology Xinxiang 453003 China School of Communication and Control Engineering Jiangnan University Wuxi 214122 China

It is difficult to build an accurate model using the traditional predictive control algorithm for a nonlinear system. Because of the nonlinearity, time variation, the control quality is not ideal. A nonlinear predictive control algorithm based on online support vector machines model was proposed. The nonlinear model of the nonlinear system was obtained by online support vector machine to train a sequence data of input and output, and we can improve the system model accuracy online. The simulation results illustrate that the nonlinear predictive control using online SVM is effective. © 2009 Binary Information Press August, 2009.

关键词： Nonlinear systems

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