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6th Annual Genetic and Evolutionary Computation Conference, GECCO 2004

作者： Qi, Zhen-Qiang Song, Shen-Min Yang, Zhao-Hua Hu, Guang-Da Zhang, Fu-En Department of Control Science and Engineering Harbin Institute of Technology Harbin150001 China Department of Automation Measurement and Control Engineering Harbin Institute of Technology Harbin150001 China

ISBN: (纸本)3540223444

This paper first analyzes the feedback principle of nature immune system and then the immune process is imitated by virtue of nonlinear molecular dynamics. Then the mathematic model of immune system is founded. The model implicates two important processes in immune system. One is that antibodies (Ab) and killer T cells (Tkill) rapidly respond to the change of the number of antigens (Ag). Another is that suppressor T cells (Tsup) inhibit and adjust the number of Ab and Tkill. The model manifests the good performance that immune system can respond to foreign materials rapidly and stabilize itself simultaneously. In this paper, foreign disturbances, input errors and measurement noises are regarded as Ag. The process in which creature presents immune response, produces antibodies and removes antigens is regarded as the control process of disturbances eliminating and differences adjusting. So, we designed a novel control algorithm based on immune feedback principle (IFC). The results of simulation show that the IFC algorithm can make the system respond quickly and get to steady state rapidly, and has good noise-proof feature. Its performance is superior to that of ordinary controllers. It also shows that the IFC algorithm suits for controlling the large time-delay system especially. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Antibodies

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A novel iris recognition method based on feature fusion

A novel iris recognition method based on feature fusion

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Peng-Fei Zhang De-Sheng Li Qi Wang Department of Automation Measurement and Control Harbin Institute of Technology China College of Mechanical Engineering & Applied Electronics Technology Beijing University of Technology China

ISBN: (纸本)0780384032

Although many approaches for iris recognition have been proposed in the last few years, few of them can perfect well in various image qualities. A novel method for iris recognition based on feature fusion is presented. Global and local iris features are extracted to improve the robustness of iris recognition for the various image quality. To represent the iris pattern efficiently, the global features are obtained from the 2D log Gabor wavelet filter and the local features are fused to complete the iris recognition. The weighting Euclidean distance and the Hamming distance are applied to match and classify. In addition, the thresholds are set up to reduce the computation time of match, and to increase robust iris recognition. Experimental results that confirm the benefits of using the proposed method are reported.

关键词： Iris recognition Feature extraction Image quality Robustness Gabor filters Hamming distance Image edge detection Lighting Encoding Independent component analysis

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Fusion of global and local feature based iris recognition

Fusion of global and local feature based iris recognition

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IEEE International Conference on Mechatronics and Automation

作者： Pengfei Zhang Shaoshi Zhang Department of Automation Measurement and Control Harbin Institute of Technology Harbin Heilongjiang China Department of Astronautic Engineering and Mechanics Harbin Institute of Technology Harbin Heilongjiang China

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Estimation of concentrations of ternary solution with NaCl and sucrose based on multifunctional sensing technique

Estimation of concentrations of ternary solution with NaCl a...

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IEEE Instrumentation and measurement technology Conference

作者： K. Shida Guo Wei Department of Electrical and Electronic Engineering Saga University Saga Japan Department of Automatic Measurement and Control Harbin Institute of Technology Harbin China

Ternary solution with NaCl and sucrose is widely employed in the osmotic dehydration process of food. In this paper we present a multifunctional sensor capable of directly sensing temperature and two physical parameters of solutions, namely ultrasonic velocity and electrical conductivity. By combination measurement of these three measurable parameters, the concentrations of various components in ternary solution with NaCl and sucrose can be simultaneously determined. A regression algorithm based on natural cubic spline interpolation and the least squares method is developed to estimate the concentrations of NaCl and sucrose, which considers the temperature influence on the multifunctional sensor and then enables decoupling of the reconstruction of concentrations in 4D space into 3D space. This sensor could prove valuable as a process control sensor in food industry.

关键词： Sugar Ultrasonic variables measurement Electrodes Temperature sensors Conductivity Acoustic sensors Silver Viscosity Steel Ceramics

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Gas identification method by microcontroller-based analysis of two-dimensional sensor behavior

Gas identification method by microcontroller-based analysis ...

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IEEE Instrumentation and measurement technology Conference

作者： P. Chaitas W. Domanski Th. Laopoulos J. Zakrzewski Electronics Lab Physics Dept Aristotle University of Thessaloniki Greece Institute of Electrical Measurement and Control Engineering Silesian University of Technology Poland

The development of a novel, stand-alone instrument for the measurement of two gases (namely methane and carbon monoxide) is presented in this paper. The main contribution of this research work is focused on the novel method for the identification of the two gases from a pair of SnO/sub 2/ sensors. Instead of suppressing the cross-sensitivity of each of the sensors, this method is combining the information from both of them to calculate the two concentrations. A two-dimensional information table, obtained from a detailed calibration procedure, is used by this microcontroller-based method which is shown to offer a clear identification and measurement of the concentration of each of the two gases with a measurement error of less than 2%.

关键词： Gas detectors Gases Temperature sensors Instruments Sensor phenomena and characterization Electric variables measurement Computerized monitoring Testing Weight control Humidity control

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Ship wakes detection in SAR images

Ship wakes detection in SAR images

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International Conference on Signal Processing Proceedings (ICSP)

作者： Zhu Weigang Wei Hua Jia Xin Zhou Yinqing Department of Measurement and Control Institute of Command and Technology of Equipment Beijing China School of Electronic Engineering Beijing Aeronautics and Astronautics University Beijing China

Detecting ship wakes from spaceborne SAR images is significant. But it is particularly difficult, especially detecting-thin line features. Because those features are not only affected by speckle but also affected by various other factors and the image resolution is often coarser than the wide of the corresponding objects. In this paper, an algorithm is developed based on line-support regions of similar gradient orientation and the Radon-transform. It was found that this approach works fairly well for the images where the ship wakes are by no means distinct.

关键词： Marine vehicles Image edge detection Speckle Radar detection Surface fitting Transforms Extraterrestrial measurements Space technology Object detection Computer vision

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Time delay estimation of vibroseis chirp signal in urban noise using higher order statistics

Time delay estimation of vibroseis chirp signal in urban noi...

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International Conference on Signal Processing Proceedings (ICSP)

作者： Chen Zubin Wang Fufang Lin Jim Jiang Zhongjin Institute of Intelligent Instrument & Measurement Control Technology Jilin University Changchun Changchun China Institute of Geology & Geophysics Chinese Academy of Sciences Beijing China Department of Physics Jilin Normal College of Engineering Technology Changchun Changchun China

One of the primary applications of higher order statistics (HOS) has been for detection and estimation of nonGaussian signals in Gaussian noise of unknown covariance. This is motivated by the fact that higher order cumulants of Gaussian processes vanish. In the present work we study the opposite problem, namely, detection and estimation in nonGaussian noise. We estimate cumulants of nonGaussian processes in the presence of unknown deterministic and/or Gaussion signals. Our approach is to augment existing second-order estimation methods using cumulants. Finally, we illustrate the hybrid strategy using field real data examples. The consistency of the results is very encouraging because the improved cumulant matching strategy we describe can be effectively used with a limited amount of data.

关键词： Delay effects Delay estimation Chirp Higher order statistics Working environment noise Low-frequency noise Colored noise Geophysical measurements Geophysics Physics

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Relative entropy multilevel thresholding method based on genetic optimization

Relative entropy multilevel thresholding method based on gen...

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2003 International Conference on Neural Networks and Signal Processing, ICNNSP'03

作者： Yang, Zhao-Hua Pu, Zhao-Bang Qi, Zhen-Qiang Department of Automation Measurement and Control Harbin Institute of Technology Harbin 150001 China Department of Control Science and Engineering Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)0780377028

Traditional optimal thresholding methods are very computationally expensive when extended to multilevel thresholding for their exhaustively search mode. So their applications are limited. In this paper, a relative entropy multilevel thresholding method based on genetic algorithm (RE-GA) is developed. The proposed method makes use of GA's properties such as high efficiency, rapid convergence and global optimization. The relative entropy is treated as the fitness function. Applying the proposed method to process image, the computation speed is accelerated and the quality is improved. Simulation results verify the performance of the proposed method by comparison with the traditional optimal thresholding methods. © 2003 IEEE.

关键词： Global optimization

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Multispectral thermometry based on neural network

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Journal of Harbin institute of technology(New Series) 2003年第1期10卷 108-112页

作者：孙晓刚戴景民 Post doctor Station of Electrical Engineering Harbin Science and Technology University Dept. of Automation Measurement & Control Harbin Institute of Technology Harbin 150001 China Dept. of Automation Measurement & Control Harbin Institute of Technology

In order to overcome the effect of the assumption between emissivity and wavelength on the measurement of true temperature and spectral emissivity for most engineering materials, a neural network based method is proposed for data processing while a blackbody furnace and three optical filters with known spectral transmittance curves were used to make up a true target. The experimental results show that the calculated temperatures are in good agreement with the temperature of the blackbody furnace, and the calculated spectral emissivity curves are in good agreement with the spectral transmittance curves of the filters. The method proposed has been proved to be an effective method for solving the problem of true temperature and emissivity measurement, and it can overcome the effect of the assumption between emissivity and wavelength on the measurement of true temperature and spectral emissivity for most engineering materials.

关键词： multispectal thermometry emissivity neural networK

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Flight guidance control using genetic algorithm combined with singular perturbation technique

Flight guidance control using genetic algorithm combined wit...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Zhen-Qiang Qi Guang-Da Hu Zhao-Hua Yang Fu-En Zhang Department of Control Science and Engineering Harbin Institute of Technology Harbin China Department of Automatic Measurement and Control Harbin Institute of Technology Harbin China

ISBN: (纸本)0780378652

An advanced midcourse guidance law based on genetic algorithm (GA) and singular perturbation technique (SPT) is proposed in this paper. The proposed midcourse guidance formulation minimizes the flight time and maximizes terminal energy subject to a terminal intercept condition. GA is used to search the optimal attack angle for the flight trajectory, and SPT is applied to approximate the terminal flight time. By combining GA and SPT, the optimal flight guidance law is obtained consequently. Meanwhile, the paper completely eliminates the need for solving two-point boundary-value problems (TBPVP), which is too complex for derivation and implementation. The simulation results show that the resulting guidance law is near-optimal and the proposed method is valid.

关键词： Genetic algorithms Perturbation methods Automatic control Nonlinear equations Missiles Sliding mode control Trajectory Aerospace engineering Genetic engineering Proportional control

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