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11th IASTED International Conference on Intelligent systems and control, ISC 2008

作者： Barambones, Oscar Alkorta, Patxi Garrido, Aitor J. Garrido, Izaskun De La Sen, Manuel Maseda, Francisco J. Martija, Itziar Dept. of Automatic Control and System Engineering University of the Basque Country EUI Nieves cano 12 Vitoria Spain IIDP Facultad de Ciencias University of the Basque Country EUI Nieves cano 12 Vitoria Spain Dept. Mechanical Engineering University of the Basque Country EUI Nieves cano 12 Vitoria Spain

ISBN: (纸本)9780889867741

This paper presents a speed control of an induction motor. The design uses an feedforward Artificial Neural Network (ANN) to implement a rotor speed estimator, and a robust control strategy based on the sliding-mode. The proposed control scheme also make use of the field oriented control theory to simplify the proposed control design. The stability analysis of the presented control scheme is provided using the Lyapunov stability theory. Finally simulated results show that the presented controller with the proposed observer provides high-performance dynamic characteristics and that this scheme is robust with respect to plant parameter variations and external load disturbances.

关键词： Robust control

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An intelligent decision combiner applied to noncooperative iris recognition

An intelligent decision combiner applied to noncooperative i...

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11th International Conference on Information Fusion, FUSION 2008

作者： Tajbakhsh, Nima Araabi, Babak N. Soltanianzadeh, Hamid Control and Intelligent Processing Center of Excellence School of Electrical and Computer Eng. University of Tehran Tehran Iran School of Cognitive Sciences IPM Tehran Iran Image Analysis Lab. Radiology Dept. Henry Ford Health System Detroit MI 48202 United States

ISBN: (纸本)9783000248832

In despite of successful implementation of iris recognition systems, noncooperative recognition is still remained as an unsolved problem. Unexpected behavior of the subjects and uncontrolled lighting conditions as the main aspects of noncooperative iris recognition result in blurred and noisy captured images. This issue can degrade the performance of iris recognition system. In this paper, to address the aforementioned challenges, an intelligent decision combiner is proposed in which prior to perform decision fusion;an automatic image quality inspection is carried out. The goal is to determine whether captured decisions based on visible light (VL) and near infrared (NIR) images have enough reliability to incorporate into final decision making. Experimental results on the UTIRIS confirm the superior performance of the proposed combiner in comparison with other common nontrainable decision combiners whereas in all cases, the effectiveness of fusion approach makes it a reliable solution to noncooperative subjects' behavior and uncontrolled lighting conditions.

关键词： Decision making

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Feature fusion as a practical solution toward noncooperative iris recognition

Feature fusion as a practical solution toward noncooperative...

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11th International Conference on Information Fusion, FUSION 2008

ISBN: (纸本)9783000248832

In noncooperative Iris recognition one should deal with uncontrolled behavior of the subject as well as uncontrolled lighting conditions. That means imperfect focus, contrast, brightness, and orientation among the others. To cope with this situation we propose to take iris images at both near infrared (NIR) and visible light (VL) and use them simultaneously for recognition. In this paper, a novel approach for iris recognition is proposed so that extracted features of NIR and VL images are fused to improve the recognition rate. When the images do not have enough quality due to focus, contrast, etc., effects of feature fusion is more pronounced. This is the situation in UTIRIS database, which is used in our experiments. Experimental results show that the proposed approach, especially in small training samples, leads to a remarkable improvement on recognition rate compared with either NIR or VL recognition.

关键词： Biometrics

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Comparison of GPS tracking loop performance in high dynamic condition with nonlinear filtering techniques

Comparison of GPS tracking loop performance in high dynamic ...

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21st International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2008

作者： Im, Sung-Hyuck Song, Jong-Hwa Jee, Gyu-In Park, Chan-Gook Navigation and Control System Lab. Konkuk University Seoul 143-701 Korea Republic of Dept. of Electronics Engineering Konkuk University Seoul 143-701 Korea Republic of School of Mechanical and Aerospace Engineering Seoul National University Seoul 143-701 Korea Republic of

ISBN: (纸本)9781605606897

The conventional GPS tracking loop is optimal in Maximum likelihood Estimation (MLE), respectively. It well works in normal signal to noise ratio (SNR) and signal dynamics within the tracking loop bandwidth. But, when the receiver operates in high dynamic environment, discriminator linearity doesn't maintain and tracking loop error increase. In the previous rearch, several algorithms were proposed to overcome these problems such as EKF based tracking loop, grid method. In the previous paper [Gee, ENC 2005], LQG based GPS receiver tracking loop is developed using EKF and Linear Quadratic Regulator (LQR). The EKF estimate the range rate, code phase, carrier phase error and navigation bit from inphase and quadrature measurement. And LQR calculate the optimal DCO input using pre-calculated steady state feedback gain. It had good tracking performance than conventional tracking loop in normal condition because it is designed to consider correlation of code and carrier tracking loop. But there is problem about nonlinearity of measurement model as ever. In this paper, LQG based GPS tracking loop is implemented using nonlinear filtering techniques, i.e. Unscented Kalman Filter (UKF) and Particle Filter (PF). Also, the implemented algorithm performance is evaluated and compared. In the EKF, the measurement equations are linearized to the first order Taylor series in order to apply the Kalman filter, which is supposed to linear Gaussian systems. Instead of truncating the nonlinear measurement equation the UKF and PF approximate the distribution of the state deterministically and randomly, with a finite set of samples, and then propagate these points or particles through the original nonlinear functions, respectively. Because the nonlinear functions are used without approximation, it provides the better performance.

关键词： Maximum likelihood estimation

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Long-term service experience with advanced austenitic alloys in Eddystone Power Station

Long-term service experience with advanced austenitic alloys...

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Pressure Vessels and Piping Conference of the American-Society-of-Mechanical-Engineers

作者： Okada, H. Igarashi, M. Yamamoto, S. Miyahara, O. Iseda, A. Komai, N. Masuyama, F. Corporate Research and Development Laboratories Sumitomo Metal Industries Ltd. Quality Control and Technical Service Dept. Steel Tube Works Sumitomo Metal Industries Ltd. Tubular Products Technology Department Sumitomo Metal Industries Ltd. Nagasaki Research and Development Center Mitsubishi Heavy Industries Ltd. Kyushu Institute of Technology Dept. Applied Science for Integrated System Engineering

ISBN: (纸本)9780791842874

A service exposure test of advanced austenitic alloys was performed at Eddystone Power Station Unit 1. The alloys tested were TP347HFG;SUPER304H and HR3C as well as 17-14CuMo as a reference material. They were installed in the final super-heater section in 1991 and were removed in 2004. The service exposure duration is 75,075 h with the steam temperature and pressure estimated 615 degrees C and 35 MPa, respectively. Post exposure examination has proved no marked hot-corrosion and steam oxidation have occurred for the TP347HFG SUPER304H and HR3C specimens, while severe hot-corrosion and exfoliation of steam-oxide films was pronounced in 17-14CuMo specimens. It is also found that HR3C exhibits the highest tensile strength with a lowest ductility and TP347HFG does vice versa, while the strength of SUPER304H is equivalent to that of 17-14CuMo with much better ductility. Short-term creep rupture strengths of these alloys have been reduced to some extent after the long-term service exposure and a longer-term creep rupture testing has been in progress. Microstructural evolution of the TP347HFG, SUPER304H and HR3C as well as 17-14CuMo during the long-term service exposure have been analyzed using a detailed TEM examination and the chemical analysis of extraction residue of the exposed specimens.

关键词： Austenitic stainless steel

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An application method of benchmark experiment results to small innovative fast reactor designs

An application method of benchmark experiment results to sma...

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International Conference on Advances in Nuclear Power Plants, ICAPP 2008

作者： Tsuboi, Yasushi Kawashima, Masatoshi Advanced Energy Design and Engineering Dept. Toshiba Corporation 8 Shinsugita-cho Isogo-ku Yokohama 235-8523 Japan Nuclear System Analysis Technology R and D Dept Power and Industrial Systems R and D Center Toshiba Corporation 8 Shinsugita-cho Isogo-ku Yokohama 235-8523 Japan Technology Development Dept. Aitel Corporation 8 Shinsugita-cho Isogo-ku Yokohama 235-8523 Japan

ISBN: (纸本)9781605607870

This paper discusses an application method of the measured sodium void worth data obtained in the physics benchmark cores to small innovative small core design with an example of the 4S core study. Combination of the physics mockup experiments and detailed analyses is a key for "near zero" sodium void worth prediction. However a conventional bias-factor-method and cross section adjustment approach cannot be expected to achieve higher accuracies to "near zero" void worth prediction in the magnitude often cents Present work revived the components- fitting method for sodium void worth prediction and discussed its applicability with a numerical experiment approach in the modeled 4S core geometry to confirm a potential for "direct use of measured void worth information from physics mockup experiments" to the sodium cooled small fast cores.

关键词： Forecasting

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Investigation of the accuracy improvement of advanced dominant eigenvalue estimation method for electric power systems

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IEEJ Transactions on Power and Energy 2008年第2期128卷 407-415+4页

作者： Sekoguchi, Masahiro Fukui, Chihiro Matori, Iwao Makino, Junichi Hanamoto, Konosuke Katayama, Takashi Takahashi, Choei Shirasaki, Takashi Information and Control Systems Division Hitachi Ltd. 5-2-1 Omika-cho Hitachi 319-1293 Japan R and D Center Tohoku Electric Power Co. Inc. 7-2-1 Nakayama Aoba-ku Sendai 981-0952 Japan Power System Engineering Dept. Tohoku Electric Power Co. Inc. 1-7-1 Honcho Aoba-ku Sendai 980-8550 Japan

The authors have been developing an estimation method of a dominant eigenvalue in large scale power systems using the measured data of the power system. A dominant eigenvalue means the eigenvalue due to long cycle oscillation mode between large scale power systems and has an important information on stability. This paper describes the basic principle of eigenvalue estimation method, the analysis of factors giving influence to accuracy and the accuracy improvement method. The result from the basic principle of eigenvalue estimation method shows that the estimated eigenvalue fluctuates in certain time domains and the accuracy is not satisfactory. The studies were made and it was clarified that frequencies lower than the frequency of the dominant eigenvalue are major sources for fluctuation and noise. In order to improve accuracy, a new method was proposed by applying maximum entropy method (MEM) to obtain power spectrum of maseaued data and by introducing new argorithm for descriminating signal from noise using MEM results. Results of applying the proposed method to dominant eigenvalue estimation show the accuracy was improved and the validity of the proposed method was verified. © 2008 The Institute of Electrical Engineers of Japan.

关键词： Power spectrum

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A Novel Technology for Microwave Heated Wire Drawing Process

A Novel Technology for Microwave Heated Wire Drawing Process

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先进纺织材料及加工技术国际学术会议

作者： Bo Keun Ha Jong Sung Kim You Huh Dept. of Mechanical Eng. Graduate School Kyung Hee University Laboratory of Intelligent Process and Control Kyung Hee University Faculty of Mechanical and Industrial System Engineering Kyung Hee University

Recent growth of modern industry requires multi-functional inorganic and micron-sized fibers. In this study, we suggested a novel method that could offer a high-efficient dieless drawing technology for manufacturing thin metal fibers based on the hot working principle. Microwave was used as the heat source. Experimental trials on a laboratory rig showed that the new system worked effectively and provided the feasibility in realizing the diameter attenuation up to 20 % diameter reduction. The theoretical model describing the wire deformation behavior in the working zone turned out to be in a good accordance to the experiment partly. Discrepancy in the hot zone near the exit could be attributed to the heat loss in the heat chamber. The coefficient of variation of the drawn wire diameter increased, as the draw ratio increased, which indicated that an ironing step would be needed to improve the evenness of the wire diameter.

关键词： Microwave Hot zone Metal wire Dieless drawing Draw ratio Diameter reduction Coefficient of variation

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Trajectory control and optimization of supercavitating torpedo

Trajectory control and optimization of supercavitating torpe...

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International Symposium on systems and control in Aerospace and Astronautics (ISSCAA)

作者： Jiang jun Liuwen hua Liu zhong Dept. of Control Science and Engineering Harbin Institute of Technology Harbin P. R. China Institute of Space Inelligent System Harbin Institute of Technology Harbin P. R. China

Underwater flight is greatly limited by the max speed of about 40 m/s that can be attained by the torpedo because of skin friction drag. Supercavitating torpedo can break the speed barrier and attain higher speed. But supercavitating phenomenon has its drawbacks which present challenges in modeling and control a supercavitating torpedo. Firstly, in this thesis, modeling and designing a controller to maneuver of a supercavitating torpedo is presented. The controller was obtained by LQR synthesis based on the assumption that cavity is fixed and the torpedo is situated symmetrically in cavity. The primary goals of controller were to get aggressive maneuverability and maximizing steady flight performance. Then optimal control problem of flight trajectory was discussed which yielded the control time histories that maneuver the torpedo according to a time-fuel optimal strategy. It was solved using the direct transcription method, a solution of a discrete parameter optimization problem. Finally the numerical simulations examples and resulting trajectories were performed to demonstrate the effectiveness of the proposed methodology.

关键词： Orbital robotics Satellites Manipulators Space vehicles Space technology Trajectory Attitude control control systems Polynomials Robotic assembly

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Study on group air to ground attack-defends hierarchical dynamic decision-making

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Journal of systems engineering and Electronics 2007年第3期18卷 540-544页

作者： Zhang Li Zhang An Zhang Yongfang Shi Zhifu Dept. of System and Control Engineering School of Electronic and Information~ Northwest Polytechnic Univ.. Xi'an 710072 P R. China

As to oppositional, multi-objective and hierarchical characteristic of air formation to ground attackdefends campaign, and using dynamic space state model of military campaign, this article establishes a principal and subordinate hierarchical interactive decision-making way, the Nash-Stackelberg-Nash model, to solve the problems in military operation, and find out the associated best strategy in hierarchical dynamic decision-making. The simulating result indicate that when applying the model to air formation to ground attack-defends decision-making system, it can solve the problems of two hierarchies, dynamic oppositional decision-making favorably, and reach preferable effect in battle. It proves that the model can provide an effective way for analyzing a battle,

关键词： dynamic game theory Nash-Stackelberg-Nash strategy hierarchical decision-making attack-defends antagonize.

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