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International Conference on computer Science and Software engineering, CSSE 2008

作者： Li, Yong Liu, Weiyi Dept. of Automation Kunming university of Science and Technology Kunming China Dept. of Computer Science and Engineering Yunnan university Kunming China

ISBN: (纸本)9780769533360

We propose a Bayesian higher-order probability logic reasoning approach with interval probability parameters to the problem of making inference from conditional knowledge, which combines weak conditional probability and conditional event algebra for approximate inferences. We define the bound-limited weak conditional interval probabilities, the corresponding probabilistic description, and the multiplication rules of weak conditional probabilities for joint probability distribution, and use higher-order conditional event to resolve a discrepancy between logic and probability. By extending normal measurable space with conditional event, we bring logic consistent with probability in denoting conditional knowledge, and then transform a higher-order conditional event to normal events and corresponding logical joint events via conditional event algebra. Based on multiplication rules, we compute the quantitative values of the events with interval parameters, and evaluate the value of higher-order conditional event and finish reasoning process. An illustrative example of application of our method shows how we make inferences from conditional knowledge. © 2008 IEEE.

关键词： Bayesian networks

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Feature matching based on geometric constraints in weakly calibrated stereo views of curved scenes

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Journal of Systems engineering and Electronics 2008年第3期19卷 562-570页

作者： Bian Houqin Su Jianbo Dept. of Automation Shanghai Jiaotong Univ. Shanghai 200240 P. R. China School of Computer & Information Engineering Shanghai Univ. of Electric Power Shanghai 200090 P. R. China

The identification of the correspondences of points of views is an important task. A new feature matching algorithm for weakly calibrated stereo images of curved scenes is proposed, based on mere geometric constraints. After initial correspondences are built via the epipolar constraint, many point-to-point image mappings called homographies are set up to predict the matching position for feature points. To refine the predictions and reject false correspondences, four schemes are proposed. Extensive experiments on simulated data as well as on real images of scenes of variant dept.s show that the proposed method is effective and robust.

关键词： feature correspondence,epipolar geometry fundamental matrix homography.

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Kernels on attributed pointsets with applications

Kernels on attributed pointsets with applications

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21st Annual Conference on Neural Information Processing Systems, NIPS 2007

作者： Parsana, Mehul Bhattacharya, Sourangshu Bhattacharyya, Chiranjib Ramakrishnan, K.R. Dept. of Computer Science and Automation Indian Institute of Science Bangalore - 560012 India Dept. of Electrical Engineering Indian Institute of Science Bangalore - 560012 India

ISBN: (纸本)160560352X

This paper introduces kernels on attributed pointsets, which are sets of vectors embedded in an euclidean space. The embedding gives the notion of neighborhood, which is used to define positive semidefinite kernels on pointsets. Two novel kernels on neighborhoods are proposed, one evaluating the attribute similarity and the other evaluating shape similarity. Shape similarity function is motivated from spectral graph matching techniques. The kernels are tested on three real life applications: face recognition, photo album tagging, and shot annotation in video sequences, with encouraging results.

关键词： Face recognition

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Crosscorrelation functions based nonlinear identification of piode laser welding process

Crosscorrelation functions based nonlinear identification of...

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2008 IEEE International Conference on Industrial Technology, IEEE ICIT 2008

作者： Zhang, Yu Liu, Yushehg Na, Xiaodong Zhang, YuMing Department of Automation College of Electrical Engineering Sichuan University Chengdu Sichuan 610065 China Center for Manufacturing Dept. of Electrical and Computer Engineering University of Kentucky Lexington KY 40506 United States

ISBN: (纸本)9781424417063

The diode laser welding process is a typical nonlinear system with disturbances and noises. To obtain unbiased estimates for unknown parameters, an identification method based on correlation functions is preferred. In this paper, a nonlinear identification method based on crosscorrelation functions is used to establish a nonlinear model, which is linear in parameters, for the diode laser welding process addressed. The model has been validated by the comparison of the computed step response with the actual step response. ©2008 IEEE.

关键词： Nonlinear systems

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Time varying analysis is model for cracks causality of concrete dams

Time varying analysis is model for cracks causality of concr...

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Earth and Space Conference 2008: Proceedings of the 11th Aerospace Division International Conference on engineering, Science, Construction, and Operations in Challenging Environments

作者： Su, Huaizhi Hu, Jiang Wen, Zhiping Wu, Zhongru Bin, Zhao College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China Dept. of Computer Engineering Nanjing Institute of Technology Nanjing 210013 China Nanjing Automation Research Institute Nanjing 210003 China

ISBN: (纸本)9780784409886

The main factors of influencing the crack change of concrete dams can be reduced to three parts of water pressure, temperature and aging, but it is very difficult to get the effects of this three parts respectively. The nonlinear time-varying relationship between the crack change and its influencing factors is very strong. Using the unique ability of data analysis and learning of artificial neural network, and through the intercrossing of dam construction knowledge, then a good approach to solve these problems can be offered. In this paper, based on in-situ monitoring data of concrete dams, from the angle of machine learning, the time varying analysis model for causality of cracks of concrete dams is introduced, and the evolution law of load cracks with the change of time and load is analyzed and forecasted. The example indicates that the model can finely describe and forecast the time varying characteristic of cracks causality in concrete dams, and can give each factor's contribution to crack opening.

关键词： Cracks

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A survey of feature extraction approaches in analog circuit fault diagnosis

A survey of feature extraction approaches in analog circuit ...

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2008 Pacific-Asia Workshop on Computational Intelligence and Industrial Application, PACIIA 2008

作者： Hong, Liu Guangju, Chen Shuyan, Jiang Guoming, Song School of Automation Engineering University of Electronic Science and Technology of China Chengdu 610054 China School of Computer Science and Technology Changchun University of Science and Technology Changchun 130022 China Computer Engineering Dept. Chengdu Electromechanical College Chengdu Sichuan province 610031 China

ISBN: (纸本)9780769534909

Feature extraction is the key process in any pattern recognition issues. There is no exception in analog circuit fault diagnosis, because fault diagnosis is equivalent to pattern recognition issue in nature. In this paper, several feature extraction approaches in the field of analog circuits fault diagnosis are summed up. Newly appeared entropy-based, kernel-function-based, fractal-theorybased, rough-set-based feature extractions approaches are described besides the widely used wavelet analysis approach. The advantages and disadvantages of these approaches are discussed also. Potential solutions and developing trends of these feature extraction approaches are indicated. © 2008 IEEE.

关键词： Feature extraction

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Robust stability of stochastic genetic regulatory networks with disturbance attenuation

Robust stability of stochastic genetic regulatory networks w...

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2008 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM 2008

作者： Feng, Wei Yang, Simon X. Fu, Wei Wu, Haixia College of Automation Chongqing University Chongqing 40044 China School of Engineering University of Guelph Guelph ON N1G 2W1 Canada Dept. of Computer and Modern Education Technology Chongqing Education College Chongqing 40067 China

ISBN: (纸本)9781424424955

This paper presents a robust stability analysis approach to stochastic genetic regulatory networks with time-varying delays. By utilizing a Lyapunov functional and conducting stochastic analysis, we show that the addressed genetic regulatory networks are robustly asymptotically stable if a convex optimization problem is feasible. New stability criteria are derived to guarantee the addressed genetic regulatory networks to be robustly asymptotically stable. And these stability criteria are formulated by means of the feasibility of a linear matrix inequality (LMI), which can be effectively solved by some standard numerical packages. Illustrative example is given to show the usefulness of the proposed robust stability criteria. © 2008 IEEE.

关键词： Linear matrix inequalities

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Modelling and identification of a small unmanned aerial vehicle

Modelling and identification of a small unmanned aerial vehi...

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作者： Soumelidis, Alexandres Gaspar, Péter Bauer, Péter Balas, Gary Systems and Control Lab Computer and Automation Research Institute Hungarian Academy of Sciences Kende st 13-17 Budapest H-1111 Hungary Dept. of Control and Transport Automation Faculty of Transportation Engineering Budapest University of Technology and Economics Bertalan Lajos st 2 Budapest H-1111 Hungary Dept. of Aerospace Engineering and Mechanics Institute of Technology University of Minnesota 110 Union st SE Minneapolis MN 55455-0153 United States

ISBN: (纸本)9789633130117

The field of Unmanned Aerial Vehicles (UAV) has gained great significance in the R&D activities of several institutions, and numerous realizations have been constructed. Controlling the movement of a UAV is one of the most significant tasks in the hierarchical control system that should be realized in order to successfully manage UAVs in several missions. Precise control of the movement requires accurate mathematical models of the aircraft that correspond to the several control schemes that are intended to apply, including linearised, LPV, and nonlinear ones. The source of mathematical models includes the physical model constructed on the basis of the Newtonian equations and the rules of aerodynamics, as well as the use of empirical observations, measurements. The methodology of system identification offers the tools that can be used to manage this field. The Systems and Control Laboratory of the computer and automation Research Institute in cooperation with University of Minnesota and Budapest University of Technology and Economics has built - as a part of a more general framework established to solve complex UAV control problems - small UAVs, equipped with on-board sensors and embedded computer with the purpose of obtaining an adequate test platform for the aircraft experiments. Based on on-board measurements acquired during the flight tests performed with the UAVs, the opportunity has been given to test several system identification approaches corresponding to the control tasks to be solved. This paper gives an outline of the system identification and modelling methods that have successfully been applied, and also analyzes the problems encountered in the data-acquisition - signal processing - computing chain.

关键词： Unmanned aerial vehicles (UAV)

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A basic study of auction-based planning and scheduling for cell manufacturing

IFIP Advances in Information and Communication Technology

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IFIP Advances in Information and Communication Technology 2008年 257卷 3-10页

作者： Fujii, Susumu Kaihara, Toshiya Sashio, Kentaro Yokose, Hiroko Kurahashi, Masasi Hayashi, Nobuhiro Sophia Univeristy Department of Mechanical Engineering 7-1 Kioi-cho Chiyoda-ku Tokyo102-8554 Japan Kobe University Dept. of Computer and Systems Engineering 1-1 Rokkodai Nada Kobe657-8501 Japan Omron Corporation Industrial Automation Company Production Management and System Engineering Group 2-2-1 Nishikusatsu Kusatsu525-0035 Japan

ISBN: (纸本)9780387772486

Cell manufacturing is widely introduced to cope with the dynamically changing market demands. This study considers a scheduling method for a cell assembly system for the products that are characterized by the type and specification. A major set up is required at a cell for the change of types and a minor one for the change of specification within the same types. The scheduling will be made in three folds. Firstly, the scheduling for the orders with due dates of the day is made before the processing of the day starts. If cells have slack times for the production of the orders of the day, express orders to be completed within the day will be accepted in a prespecified time period or until no cells become available for the production. If slack times still exist, advanced production of orders with future due dates will be considered. Auction-based algorithms are proposed for the scheduling and their effectiveness is investigated by simulation studies. © 2008, IFIP International Federation for Information Processing. All rights reserved.

关键词： Scheduling

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Path planning of free-floating robot in cartesian space using direct kinematics

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International Journal of Advanced Robotic Systems 2007年第1期4卷 17-26页

作者： Xu, Wenfu Liang, Bin Li, Cheng Xu, Yangsheng Qiang, Wenyi Dept. of Control Science and Engineering Harbin Institute of Technology Harbin China Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong Hong Kong

Dynamic singularities make it difficult to plan the Cartesian path of free-floating robot. In order to avoid its effect, the direct kinematic equations are used for path planning in the paper. Here, the joint position, rate and acceleration are bounded. Firstly, the joint trajectories are parameterized by polynomial or sinusoidal functions. And the two parametric functions are compared in details. It is the first contribution of the paper that polynomial functions can be used when the joint angles are limited (In the similar work of other researchers, only sinusoidla functions could be used). Secondly, the joint functions are normalized and the system of equations about the parameters is established by integrating the differential kinematics equations. Normalization is another contribution of the paper. After normalization, the boundary of the parameters is determined beforehand, and the general criterion to assign the initial guess of the unknown parameters is supplied. The criterion is independent on the planning conditions such as the total time tf. Finally, the parametes are solved by the iterative Newtonian method. Modification of tf may not result in the recalculation of the parameters. Simulation results verify the path planning method.

关键词： Mobile robots

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