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Erratum to “Image watermarking algorithm based on fractional Fourier transform and random phase encoding” [Optics Communications 284/16-17 (2011) 3918–3923]

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Optics Communications 2011年第21期284卷 5231-5231页

作者： Qing Guo Zhengjun Liu Shutian Liu Department of Physics Harbin Institute of Technology Harbin 150001 PR China Center for Earth Observation and Digital Earth Chinese Academy of Sciences Beijing 100094 PR China Department of Automation Measurement and Control Engineering Harbin Institute of Technology Harbin 150001 PR China

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Stochastic stabilization of Markovian jump systems in the presence of partial unknown transition probabilities and actuator saturation

Stochastic stabilization of Markovian jump systems in the pr...

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作者： Wang, Yijing Zuo, Zhiqiang Cui, Yulong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China Department of Mathematics City University of Hong Kong Kowloon Hong Kong

ISBN: (纸本)9787894631046

This paper deals with the controller design problem for Markovian jump systems subject to partial unknown transition probabilities and actuator saturation. Different from the previous results where complete knowledge on the transition probabilities is available, a new controller synthesis scheme is proposed as well as an estimate of the domain of attraction in mean square sense. A sufficient condition is first established to guarantee the stochastic stability of the closed-loop system. An optimization problem with LMI constraints is then formulated to determine the largest contractively invariant set in mean square sense. Finally, a numerical example is provided to show the effectiveness of our method.

关键词： Closed loop systems

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Single Source Current Drive Patterns for Electrical Impedance Tomography

Single Source Current Drive Patterns for Electrical Impedanc...

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IEEE Instrumentation & measurement Technology Conference

作者： Lifeng Zhang Huaxiang Wang Department of Automation North China Electric Power University Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation TianjinUniversity

ISBN: (纸本)9781424428328;9781424428335

Electrical impedance tomography (EIT) is a technique for reconstructing conductivity of an inhomogeneous medium by injecting currents at the boundary of an object and measuring the resulting changes in voltage. The SNR of acquisitive data and the reconstructed image quality of EIT system are directly determined by current drive patterns. In this paper, eight current drive patterns with the same boundary voltage measurement strategy have been studied. The isopotential lines, the number of independent measurements, measured voltage dynamic range, voltage change with conductivity change and reconstructed image quality of these patterns are compared, through which an optimal current drive pattern was obtained.

关键词： Electrical impedance tomography Current drive pattern Finite element method Image reconstruction

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Observer-based estimation of pressure signals in hydrostatic transmissions

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IFAC Proceedings Volumes 2010年第7期43卷 425-430页

作者： Horst Schulte Patrick Gerland University of Applied Science Berlin (HTW) Department of Engineering I Electrical Engineering and Automation Wilhelminenhofstr. 75A 12459 Berlin Germany University of Kassel Faculty of Mechanical Engineering Measurement and Control Moenchebergstr. 7 34125 Kassel Germany

Hydrostatic transmissions, also called hydrostatic gears, have been widely used in mobile working machines and off-road vehicles such as construction and agricultural machines. This kind of transmission offers important advantages like continuously variable transmission with high power density, maximum tractive force at low speeds and reversing without changing gear. The automatic electronic control of hydrostatic transmissions, which depend on a number of measurable values, has become more common in industrial practice. To ensure the reliability and safety at least a two-channel redundant system for the measuring channels is required. In this paper, a general model-based approach using a Takagi-Sugeno (T-S) fuzzy observer for analytical redundancy of the oil pressure measuring process in hydrostatic transmissions is developed. It has been shown by experimental results that this approach can be used to estimate the pressure values under varying load conditions and different driving situations.

关键词： observer design failure detection hydraulic systems

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Continuous Noninvasive Blood Pressure measurement by Near Infra Red CCD Camera and Pulse Transmit Time Systems

Continuous Noninvasive Blood Pressure Measurement by Near In...

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International Conference on Computer engineering and Applications (ICCEA)

作者： Petr Zurek Ondrej Krejcar Marek Penhaker Martin Cerny Robert Frischer Department of Measurement and Control Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava Ostrava Czech Republic Department of Automation and Computing in Metallurgy Faculty of Metallurgy and Materials Engineering Technical University of Ostrava Ostrava Czech Republic

ISBN: (纸本)9781424460793;9780769539829

The need of continuous blood pressure measurement is usable in wide spectrum of applications from physicians practice to home care applications. Many types of blood pressure measurement devices can be bought in electronics shops. All such devices are contact measurement devices which need to be in contact of human body (hand or foot mainly). Secondary they allow only one measurement per several minutes interval (typically ones in 10 minutes). Our goal is to develop a small device for noninvasive continuous measurement of blood pressure. This device must be a small battery powered embedded system which measure a blood pressure during a long time period and send this information remotely to operator's stations. We would like to try two systems of blood pressure monitoring. The first one is system with NIR CCD camera (Near Infra Red), which measure the wide changes of the blood vessels and the second one is system, which measure the pulse transmit time (PTT). At the end we can compare the systems and get information, which system will be a right way to obtain exact continuous blood pressure information.

关键词： Pulse measurements Blood pressure Pressure measurement Time measurement Charge coupled devices Charge-coupled image sensors Biomedical monitoring Battery charge measurement Humans Foot

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Design and Realization of Low Cost Discrete PSD controller for Power Electronics Applications

Design and Realization of Low Cost Discrete PSD Controller f...

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International Conference on Computer engineering and Applications (ICCEA)

作者： Ondrej Krejcar Michal Tutsch Robert Frischer Ivo Spicka Department of Measurement and Control Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava Ostrava Czech Republic Department of Automation and Computing in Metallurgy Faculty of Metallurgy and Materials Engineering Technical University of Ostrava Ostrava Czech Republic

ISBN: (纸本)9781424460793;9780769539829

Most systems are controlling by common PID controllers. These PID controllers are available in variety possibilities. They are divided by types of controlling systems, by speed of action interference, by complexity, by robustness etc. Most of industrial controllers are very expensive and except of some basic setting they are not offering any other way, how to involve into controlling process. On the other side, developing new analog controller to control simple systems is not reasonable in financial or time issue. That's why we decided to build simple, discrete controller and implement its algorithm into single chip eight bit microcontroller (MCU). This discrete controller - PSD - is characteristic its simplicity and variability. It can control plenty of less complicated systems by a mere change of its characteristic parameters. Thanks to modern approach is possible to create a full-featured controller including power action element on an area equal to 7cm 2 .

关键词： Costs Power electronics control systems Three-term control Interference Robust control Electrical equipment industry Industrial control Process control Microcontrollers

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The circular-scanning algorithm in laser marking based on mathematical morphology: Design and implementation

The circular-scanning algorithm in laser marking based on ma...

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作者： Liu, Ling Wu, Huaiyu Cheng, Lei Wang, Yongji Zhu, Quanmin Department of Information Wuhan University of Science and Technology Wuhan 430081 China Engineering Research Center of Metallurgical Automation and Measurement Technology Ministry of Education in China Wuhan University of Science and Technology Wuhan 430081 China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Bristol Institute of Technology University of West of England Bristol BS161QY United Kingdom

ISBN: (纸本)9780955529337

Laser processing has excellent processing performance, making the laser processing technology used widely, bringing huge economic benefits. An efficient algorithm of circular scanning and the corresponding design and implementation in laser marking will be introduced in this article. The algorithm is based on mathematical morphological, and realized on Visual c++ and GDI+ platform. The distance of the scanning line we got in the original graphic is in accordance with our expectation, and the scanning time is not more than ***. Such stability and accuracy is originated from the core portion of the algorithm that is one-step scanning which makes each closed contour widen inspired by the thought of corrosion expansion algorithm and is aplicable to any curves so that assure reliability, such widen size is in accordance to scanning distance setted by users. This article can be divided into three parts: basics introduction, algorithm design, implementation. The results of numerous circular-scanning examples verify the effectiveness of the algorithm.

关键词： Scanning

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Notice of Retraction: Material inner defect detection by a vibration spectrum analysis

Notice of Retraction: Material inner defect detection by a v...

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International Conference on Mechanical and Electronics engineering (ICMEE)

作者： Ondrej Krejcar Robert Frischer Department of Measurement and Control Center for Applied Cybernetics Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava Ostrava Czech Republic Department of Automation and Computing in Metallurgy VSB-Technical University of Ostrava Ostrava Czech Republic

This article has been retracted by the publisher.

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Use of accelerometers for material inner defect detection

Use of accelerometers for material inner defect detection

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International Conference on Applied Electronics, AE

作者： Ondrej Krejcar Robert Frischer Department of Measurement and Control Center of Applied Cybernetics Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava Ostrava Czech Republic Department of Automation and Computing in Metallurgy VSB-Technical University of Ostrava Ostrava Czech Republic

This paper deals with a possibility of non-destructive diagnostics of solid objects by software analysis of vibration spectrum by accelerometers. By a use of MATLAB platform, a processing and information evaluation from accelerometer is possible. Accelerometer is placed on the measured object. The analog signal needs to be digitized by a special I/O device to be processed offline with FFT (Fast Fourier Transformation). The power spectrum is then examined by developed evaluating procedures.

关键词： Accelerometers Vibrations Software Conferences Distortion measurement Converters Unified modeling language

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The circular-scanning algorithm in laser marking based on mathematical morphology: Design and implementation

The circular-scanning algorithm in laser marking based on ma...

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International Conference on Modelling, Identification and control (ICMIC)

作者： Ling Liu Huaiyu Wu Lei Cheng Yongji Wang Quanmin Zhu Department of Information Wuhan University of Science and Technology Wuhan China Engineering Research Center of Metallurgical Automation and Measurement Technology Ministry of Education in China Wuhan University of Science and Technology Wuhan China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan China Bristol Institute of Technology University of West of England Bristol UK

Laser processing has excellent processing performance, making the laser processing technology used widely, bringing huge economic benefits. An efficient algorithm of circular scanning and the corresponding design and implementation in laser marking will be introduced in this article. The algorithm is based on mathematical morphological, and realized on Visual c++ and GDI+ platform. The distance of the scanning line we got in the original graphic is in accordance with our expectation, and the scanning time is not more than 0.1s. Such stability and accuracy is originated from the core portion of the algorithm that is one-step scanning which makes each closed contour widen inspired by the thought of corrosion expansion algorithm and is aplicable to any curves so that assure reliability, such widen size is in accordance to scanning distance setted by users. This article can be divided into three parts: basics introduction, algorithm design, implementation. The results of numerous circular-scanning examples verify the effectiveness of the algorithm.

关键词： Corrosion

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