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An interval change detection method for two chest X-ray images with different rotation angles of the human body and its performance evaluation

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systems and computers in Japan 2005年第10期36卷 30-42页

作者： Matsuo, Yoshie Shimizu, Akinobu Kobatake, Hidefumi Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and Technology Koganei 184-8588 Japan Tokyo University of Agriculture and Technology IEEE Information Processing Society of Japan Japan MEBE Society Japanese Society of Medical Imaging Technology Japan Society for Computer Aided Diagnosis of Medical Images Faculty of Engineering Tokyo University of Agriculture and Technology Society of Instrument and Control Engineers Acoustic Society of Japan

This paper proposes a detection procedure for the interval change of two chest X-ray images with different rotation angles of the human body around the axis parallel to the projection plane (such as anterior-posterior inclination and rotation around the body axis). The difference in angles causes shadow exchange between two images, which is difficult to handle precisely by the conventional position alignment procedure using nonlinear deformation. We developed a novel alignment procedure for each depth which was inspired by the fact that the position of the shadow on the X-ray image depends on the 3D depth (distance from the X-ray source) of the tissue which corresponds to the shadow. In this paper, the results of applying the proposed method to X-ray images taken from a chest phantom and an actual human body are presented and the effectiveness of the method is discussed. © 2005 Wiley Periodicals, Inc.

关键词： Medical imaging

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Transport of Mars-Crossing Asteroids from the Quasi-Hilda Region

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Physical Review Letters 2005年第23期94卷 231102-231102页

作者： Michael Dellnitz Oliver Junge Martin W. Lo Jerrold E. Marsden Kathrin Padberg Robert Preis Shane D. Ross Bianca Thiere Faculty of Computer Science Electrical Engineering and Mathematics University of Paderborn D-33095 Paderborn Germany Navigation and Mission Design Jet Propulsion Laboratory California Institute of Technology M/S 301-140L 4800 Oak Grove Drive Pasadena California 91109 USA Control and Dynamical Systems California Institute of Technology MC 107-81 Pasadena California 91125 USA Department of Aerospace and Mechanical Engineering University of Southern California Los Angeles California 90089 USA

We employ set oriented methods in combination with graph partitioning algorithms to identify key dynamical regions in the Sun-Jupiter-particle three-body system. Transport rates from a region near the 3∶2 Hilda resonance into the realm of orbits crossing Mars’ orbit are computed. In contrast to common numerical approaches, our technique does not depend on single long term simulations of the underlying model. Thus, our statistical results are particularly reliable since they are not affected by a dynamical behavior which is almost nonergodic (i.e., dominated by strongly almost invariant sets).

关键词： .graph orbits partitioning week ending Asteroids Preis Mars-Crossing Quasi-Hilda

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ON THE SELECTION OF APPROPRIATE control SYSTEM DESIGN METHODOLOGIES

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IFAC Proceedings Volumes 2005年第1期38卷 115-120页

作者： L.G. Van Willigenburg W.L. De Koning Z.S. Chalabi M. Tchamitchian G. Van Straten Systems and Control Group Wageningen University P.O. Box 17 6700 AA Wageningen The Netherlands Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Mekelweg 4 2628 CD Delft The Netherlands University of London Public and Environmental Health Research Unit London School of Hygiene and Tropical Medicine Keppel Street London WC1E 7HT United Kingdom INRA Bioclimatologie Domaine StPaul Site Agroparc 84914 Avignon Cedex 9 France

We will argue in this paper that the nature and magnitude of model uncertainty dictate the appropriateness of the control system design methodology. To obtain these arguments, we will pursue optimality of the control system design. Note this is a philosophical paper , in which we present our arguments in qualitative terms . We will identify the circumstances under which several control system design methodologies are appropriate. The design methodologies that will be considered are (1) optimal control and optimal feedback design, (2) model predictive control (receding horizon control), (3) active and passive adaptive control and (4) robust control. Robust control strategies are conservative and limit the possible improvements that can be obtained over say classical PID control. However, it will turn out that for certain types of control problems, improvements in performance are indeed limited. Roughly speaking, the area where we may expect (significant) improvement from advanced (optimal) control system design is very much limited by the uncertainty of the systems model. Miracles are not to be expected from advanced control. What can be expected is reflected in an active adaptive optimal control scheme introduced and discussed in this paper.

关键词： controller selection model uncertainty active adaptive control adaptive dual control caution probing learning

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Distributed processing of measurement results in a control system: Can mobile software agents help? 10

Distributed processing of measurement results in a control s...

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10th IMEKO TC7 Symposium on Advances of Measurement Science 2004

作者： Smolko, Danila S. Saint Petersburg State Polytechnic University Computer Science and Engineering Faculty Department of Information and Control Systems 195251 Saint Petersburg ul. Polytechnicheskaya 21 Saint-Petersburg Russia

ISBN: (纸本)9781634391887

Distributed processing of measurement results poses a number of challenges. Among important requirements are security, performance, robustness and ability to withstand network failures, need for flexibility and elegance of a proposed solution. We propose a novel approach to distributed processing, which capitalises on locality of data access. We propose a distributed software architecture that leverages a flexible consistency checking engine and takes advantage of software agency features in order to meet the mentioned distributed processing requirements.

关键词： Network architecture

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Soft time-suboptimal controlling structure for mechanical systems

Soft time-suboptimal controlling structure for mechanical sy...

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International Workshop on Robot Motion and control (RoMoCo)

作者： P. Kulczycki R. Wisniewski P. Kowalski K. Krawiec Polish Academy of Sciences Systems Research Institute Warsaw Poland Department of Control Engineering Aalborg University Aalborg Denmark Faculty of Electrical and Computer Engineering Cracow Univ. of Technology Cracow Poland

The paper presents the conception of a soft control structure based on the time-optimal approach. Its parameters are selected in accordance with the rules of the statistical decision theory and additionally it allows the elimination of rapid changes in control values. The object is a basic mechanical system, with uncertain (also non-stationary) mass treated as a stochastic process. The methodology proposed here is of a universal nature and may easily be applied with respect to other uncertainty elements of time-optimal controlled mechanical systems.

关键词： control systems Mechanical systems Stochastic processes Optimal control Force control Motion control Torque control Weight control Velocity control control engineering

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Database technology and industrial transaction techniques in control education 6

Database technology and industrial transaction techniques in...

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6th IFAC Symposium on Advances in control Education, ACE 2003

作者： Flochova, Jana Galbavy, Miroslav Department of Automatic Control Systems Department of Computer Science Faculty of Electrical Engineering and Information Technology Slovak University of Technology Ilkovicova 3 Bratislava81219 Slovakia

New developments in computer networks and communications provide new possibilities for control purposes. control systems for highly complex plants are themselves very complex and heterogeneous. A new software infrastructure is needed that exploits these new emerging software technologies. An essential activity to be pursued is that of education and of including new technology in control education. The aim of this paper is to describe some of our activities and experiences in teaching of information techniques and technologies included in open control platforms of complex control systems. Copyright © IFAC Advances in control Education Oulu, Finland, 2003

关键词： Information management

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Identification of fully parameterized linear and nonlinear state-space systems by projected gradient search 13

Identification of fully parameterized linear and nonlinear s...

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13th IFAC Symposium on System Identification, SYSID 2003

作者： Verdult, Vincent Bergboer, Niek Verhaegen, Michel Delft University of Technology Faculty of Information Technology and Systems Control Systems Engineering P. O. Box 5031 GA DelftNL-2600 Netherlands Maastricht University Department of Computer Science St Jacobstraat 6 Maastricht Netherlands

A nonlinear optimization-based identification procedure for fully parameterized multivariable state-space models is presented. The method can be used to identify linear time-invariant, linear parameter-varying, composite local linear, bilinear. Hammerstein and Wiener systems. The nonuniqueness of the full parameterization is dealt with by a projected gradient search to solve the nonlinear optimization problem. Both white and nonwhite measurement noise at the output can be dealt with in a maximum likelihood setting. It is proposed to use subspace identification methods to initialize the nonlinear optimization problem. A computationally efficient and numerically reliable implementation of the procedure is discussed in detail. © 2003 International Federation of Automatic control.

关键词： Nonlinear programming

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Realization of high-performance bilingual English/Arabic articulated document analysis and understanding system

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International Journal of computer Applications in Technology 2003年第1期16卷 54-65页

作者： Arafat Ali, H. El-Desouky, Aly I. Abd El-Gwad, Aida O. Information Systems Department Faculty of Comp. and Info. Systems Mansoura University Mansoura Egypt Computer and Control Department Faculty of Engineering Mansoura University Mansoura Egypt

Document analysis and understanding (DAU) systems aim not only at the recognition of text but also at the extraction of relevant information out of a scanned document. Numerous studies have introduced efficient algorithms for document analysis, some of these studies proposed an articulated and/or a translation stage. Also little work has been done in the English/Arabic (E/A) translation area. The main objective of this paper is to introduce a combination between the three trends (document understanding, E/A translation, and handling the output in articulated voice). This paper focuses on the realization of a bilingual articulated E/A system based on optical character recognition (OCR). The input of the proposed system will be an English or Arabic text through scanner or video camera;the output will be an articulated voice. The proposed scheme consists of two phases. The first phase consists of many processes, beginning with converting scanned document into an electronic processable form. Then in the segmentation step, the essential problem in Arabic OCR, that is, how to cope with the various shapes of the same character, is solved. A new methodology for segmenting Arabic characters is presented. At the end of this phase an efficient method of text recognition based on hybrid description (ANN, FFT) is used. In order to verify the performance of this phase, experiments with printed text were performed. The error rates were less than 0.1%. Results showed that the proposed scheme in this phase is very robust. In the second phase, a database with 3000 audio files was encapsulated to convert each word from the input text (the output of the first phase) to its correspondence. This research can help in many real-time applications such as: (immediate translation, machine reader for blind people, learning...).

关键词： Optical character recognition

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Study of teleoperation using realtime communication network emulation

Study of teleoperation using realtime communication network ...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： S. Hirche M. Buss Control Systems Group Faculty of Electrical Engineering and Computer Science Technical University Berlin Germany

The stability and performance of telepresence systems with kinesthetic (force) feedback operated via a communication network mainly depends on the quality (delay, bandwidth) of communication. The combined position/force control of teleoperation system with time delay using impedance matching filters to achieve robust passivity for the teleoperator/environment and transparency is discussed. The impedance matching filter design is the result of optimization in the frequency domain. An experimental telepresence system using realtime communication network emulation is used to show the validity of the proposed approach.

关键词： Communication networks Emulation Force feedback Impedance matching Band pass filters Matched filters Stability Bandwidth Force control Delay effects

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Fault detection of non-linear systems based on multi-form quasi-armax modeling and its application to the ship benchmark 13

Fault detection of non-linear systems based on multi-form qu...

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13th IFAC Symposium on System Identification, SYSID 2003

作者： Kumamaru, K. Inoue, K. Hosoyamada, Y. Söerström, T. Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu 680-4 Fukuoka Iizuka820-8502 Japan Department of Automatic Control and System Analysis Institute of Technology Uppsala University P.O.Box 27 Uppsala Sweden

This paper is concerned with an application study of model-based fault detection method to a ship propulsion system. When modeling the object system, Quasi-ARMAX model with multi-model form is used. In this model, the system non-linearity is incorporated into model parameters by using non-linear non-parametric models (NNMs). Kullback discrimination Information (KDI) is introduced as fault detection index to evaluate the distortion in identified model, which is caused by a fault. The effectiveness of the method is verified through simulation studies on the ship propulsion system. © 2003 International Federation of Automatic control.

关键词： Fault detection

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