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检索条件"机构=Laboratory of Science and Technology of Automatic Control and Computer Engineering"

共 3139 条记录，以下是2761-2770 订阅

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Study of the cost-sensitive AdaBoost face detection algorithm

Study of the cost-sensitive AdaBoost face detection algorith...

引用

2010 International Conference on computer Application and System Modeling, ICCASM 2010

作者： Song, Dingli Yang, Bingru Yu, Fuxing School of Information Engineering University of Science and Technology Beijing Beijing China College of Sciences Hebei Polytechnic University Tangshan Hebei Province China College of Computer and Automatic Control Hebei Polytechnic University China

ISBN: (纸本)9781424472369

It is the mainstream method that in human face detection and recognition with AdaBoost as the representative based on statistical learning method. Detection rates have reached a high level, and can achieve real-time detection. However, AdaBoost algorithm treats equally for different categories, there is no distinction between the cost of the different error categories. This paper presents a new cost-sensitive AdaBoost-based face detection algorithm, ensuring the detection rate and speed, effectively reducing the false detection rate, and improving the detection accuracy. © 2010 IEEE.

关键词： Adaptive boosting

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Development of FE-based computer-assisted design system for induction machines

Development of FE-based computer-assisted design system for ...

引用

International Conference on Electrical Machines, ICEM

作者： Mariusz Jagiela Krystyna Macek-Kaminska Department of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Opole Poland

This paper describes the software environment for computer assisted design of three-phase squirrel cage induction machines. The finite element method is used as a computational technique to account for detailed geometrical properties, skew, material nonlinearity and deep-bar effect. The system enables determination of all electromagnetic quantities that are usually of interest of the designers of electrical machines. Besides of that it enables the design optimization. The design of experiment is used as a principal method. Sample results of calculations compared with measurements and sample design optimization are presented.

关键词： Rotors Windings Induction motors Mathematical model Stator windings Optimization Finite element methods

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RETRACTED ARTICLE: Dynamic feedback equalization algorithm for minimum weight

RETRACTED ARTICLE: Dynamic feedback equalization algorithm f...

引用

作者： Song, Shouyun Xu, Junpeng Cong, Qing Dept. of Automatic Control Department Henan Mechanical and Electrical Engineering College Xinxiang Henan China Dept. of Mechanical Engineering Henan Institute of Science and Technology Xinxiang Henan China Dept. of Computer and Information Technology Henan University Kaifeng Henan China

ISBN: (纸本)9781424455386

the paper analyzes the existing Linux virtual server (LVS) cluster load balancing algorithm and its inadequacies that not real-time dynamic full makes an appraisal to the load on the each server node, designs a new Dynamic Feedback Equalization Algorithm for Minimum Weight. The algorithm considers real-time load and response capacity of each server node, makes pre-load rate of the server combined with response time, dynamic generates server node weights by real-time feedback and conducts adjust to the load balancing of server cluster by using Minimum weight balancing algorithm. This algorithm has done a comparison with the Weighted Least Connections, theory analysis and experimental results show that the improved dynamic load balancing algorithm is more effective than Weighted Least Connections. © 2010 IEEE.

关键词： Clustering algorithms

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Analyzing the delay time of train entering station process with Petri Nets

Analyzing the delay time of train entering station process w...

引用

2010 International Conference on Logistics engineering and Intelligent Transportation Systems, LEITS2010

作者： Hei, Xinhong Na, Ou-Yang School of Computer Science and Engineering Xi'an University of Technology Xi'an China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424487783

computerized interlocking systems have been studied for many years. Available interlocking systems mainly are centralized control systems. The great progress of distributed control technology and intelligent terminals make it possible to develop distributed interlocking system. To standardize operations of devices in distributed railway signaling system, this article takes the process of train entering the station as the focal point and models it with GSPN. To ensure the model safety, the structural properties are verified with the reachability set. Finally, the relationship between the throughput ability of station and parameters of system delay time are analyzed, including the time of route request, the interval of train request, and the polled time in station. In addition the standard operation time of devices is evaluated. ©2010 IEEE.

关键词： Petri nets

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Modeling nonlinear acoustic wave fields in media with inhomogeneity in theattenuation and in the nonlinearity

Modeling nonlinear acoustic wave fields in media with inhomo...

引用

IEEE International Ultrasonics Symposium

作者： Demi, L. Verweij, M.D. De Jong, N. Van Dongen, K.W.A. Laboratory of Acoustical Imaging and Sound Control Faculty of Applied Sciences Delft University of Technology Netherlands Laboratory of Electromagnetic Research Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Netherlands Laboratory of Experimental Echocardiography Erasmus Medical Center Rotterdam Netherlands

ISBN: (纸本)9781457703829

Biomedical tissues usually show inhomogeneity in their acoustic mediumparameters. These inhomogeneities cause refraction and scattering of diagnosticand therapeutic ultrasound waves. A method that is able to model the effects ofinhomogeneity in the attenuation and in the nonlinearity is essential for thedesign of transducers for new ultrasound modalities and the development of novelultrasound applications. The Iterative Nonlinear Contrast Source (INCS) methodhas originally been designed for the accurate modeling of nonlinear acousticwave fields in homogeneous media. It considers the nonlinear term from theWestervelt equation as a distributed contrast source, and the correspondingintegral equation is solved using an iterative Neumann scheme. This paperpresents an extension of the INCS method that can handle inhomogeneity in theattenuation and in the coefficient of nonlinearity. Results are presented forthe one-dimensional case. These show that in this case the presented methodcorrectly predicts the effects related to nonlinear propagation and scatteringby inhomogeneities in the attenuation and the coefficient of non-linearity.© 2010 IEEE.

关键词： Nonlinear equations

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Modeling nonlinear medical ultrasound via a linearized contrast sourcemethod

Modeling nonlinear medical ultrasound via a linearized contr...

引用

IEEE International Ultrasonics Symposium

ISBN: (纸本)9781457703829

Research on nonlinear medical ultrasound has been increased over the lastdecade and has resulted in a wide range of numerical methods for the modeling ofthe nonlinear distortion of a propagating pressure wave. However, when appliedto realistic configurations, the majority of these methods are eithercomputationally expensive or limited by the applied approximations. TheIterative Nonlinear Contrast Source (INCS) method is able to accurately computethe pulsed nonlinear pressure wave field that is generated in a largethree-dimensional domain by an arbitrary transducer transmitting under a largesteering angle. The method is based on the Neumann iterative solution of anonlinear integral equation that is equivalent to the Westervelt equation. Toimprove the performance of the method, it would be beneficial to employiterative schemes (e.g. Conjugate Gradient based schemes) that are efficient forsolving linear integral equations. This motivates the development of alinearized version of the INCS method, as presented in this paper. To test thepresented approach, a Bi-CGSTAB scheme is used to solve the linearizedWestervelt equation. For the one-dimensional case, results are obtained andcompared with the solution obtained with the original INCS method, and theFubini solution. All the results have been obtained up to the third harmoniccomponent and are in agreement with each other. © 2010 IEEE.

关键词： Integral equations

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Calibration research on fish-eye lens

Calibration research on fish-eye lens

引用

2010 IEEE International Conference on Information and Automation, ICIA 2010

作者： Wang, Xiaofeng Feng, Weijia Liu, Qingjie Zhang, Baofeng Cao, Zuoliang School of Mechanical Engineering Tianjin University of Technology Tianjin China State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin China School of Computer Science and Engineering Beihang University Beijing China Tianjin Key Laboratory for Control Theory and Applications in Complicated Industry Systems Tianjin University of Technology Tianjin China

ISBN: (纸本)9781424457021

A novel calibration method for fisheye lens camera is proposed in this paper. The method is based on equidistance projection model of fisheye lens. The inner structure of the fisheye lens which consists of many pieces of lens is so complex that it is very difficult and unnecessary to construct its physical model. The optical center of the fisheye lens (u0,ν0), the virtual focal of the fish-eye lens l and the ration of the distortion in x coordinate Kx and the Ky in y coordinate should be calibrate in the mathematical mode proposed by us. Some special calibration patterns have been designed for calibrating them. Here, the optical center is the precondition for other parameters precise calibration. Therefore, we discuss four different methods to get it. The experiment results show that the methods we present are accurate and stable. ©2010 IEEE.

关键词： Calibration

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Modeling nonlinear medical ultrasound via a linearized contrast source method

Modeling nonlinear medical ultrasound via a linearized contr...

引用

ISBN: (纸本)9781457703829

Research on nonlinear medical ultrasound has been increased over the last decade and has resulted in a wide range of numerical methods for the modeling of the nonlinear distortion of a propagating pressure wave. However, when applied to realistic configurations, the majority of these methods are either computationally expensive or limited by the applied approximations. The Iterative Nonlinear Contrast Source (INCS) method is able to accurately compute the pulsed nonlinear pressure wave field that is generated in a large three-dimensional domain by an arbitrary transducer transmitting under a large steering angle. The method is based on the Neumann iterative solution of a nonlinear integral equation that is equivalent to the Westervelt equation. To improve the performance of the method, it would be beneficial to employ iterative schemes (e.g. Conjugate Gradient based schemes) that are efficient for solving linear integral equations. This motivates the development of a linearized version of the INCS method, as presented in this paper. To test the presented approach, a Bi-CGSTAB scheme is used to solve the linearized Westervelt equation. For the one-dimensional case, results are obtained and compared with the solution obtained with the original INCS method, and the Fubini solution. All the results have been obtained up to the third harmonic component and are in agreement with each other. © 2010 IEEE.

关键词： Numerical methods

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Modeling nonlinear acoustic wave fields in media with inhomogeneity in the attenuation and in the nonlinearity

Modeling nonlinear acoustic wave fields in media with inhomo...

引用

ISBN: (纸本)9781457703829

Biomedical tissues usually show inhomogeneity in their acoustic medium parameters. These inhomogeneities cause refraction and scattering of diagnostic and therapeutic ultrasound waves. A method that is able to model the effects of inhomogeneity in the attenuation and in the nonlinearity is essential for the design of transducers for new ultrasound modalities and the development of novel ultrasound applications. The Iterative Nonlinear Contrast Source (INCS) method has originally been designed for the accurate modeling of nonlinear acoustic wave fields in homogeneous media. It considers the nonlinear term from the Westervelt equation as a distributed contrast source, and the corresponding integral equation is solved using an iterative Neumann scheme. This paper presents an extension of the INCS method that can handle inhomogeneity in the attenuation and in the coefficient of nonlinearity. Results are presented for the one-dimensional case. These show that in this case the presented method correctly predicts the effects related to nonlinear propagation and scattering by inhomogeneities in the attenuation and the coefficient of non-linearity. © 2010 IEEE.

关键词： Integral equations

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Conceptual design of an energy efficient transfemoral prosthesis

Conceptual design of an energy efficient transfemoral prosth...

引用

2010 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： R. Unal R. Carloni E.E.G. Hekman S. Stramigioli H.F.J.M. Koopman Control Engineering Laboratory Faculty of Electrical Engineering Mathematics and Computer Science Biomechanical Engineering Laboratory Faculty of Engineering Technology University of Twente Netherlands Control Engineering Laboratory Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Netherlands Biomechanical Engineering Laboratory Faculty of Engineering Technology University of Twente Netherlands

In this study, we present the conceptual design of a fully-passive transfemoral prosthesis. The design is inspired by the power flow in human gait in order to have an energy efficient device. The working principle of the conceptual mechanism is based on three storage elements, which are responsible of the energetic coupling between the knee and the ankle joints. Design parameters of the prosthesis have been determined according to the energy absorption intervals of the human gait. Simulation results shows that the power flow of the system is comparable with human data. Finally, an initial prototype is presented as proof of concept.

关键词： Knee Joints Humans Springs Leg Absorption Prosthetics

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