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作者： Wang, Shuping Zhang, Guoshan Liu, Wanquan School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China Department of Computing Curtin University of Technology WA 6102 Australia

ISBN: (纸本)9787894631046

In this paper, the problem of dissipativity analysis and output feedback control synthesis for discrete linear time-invariant systems with state-space symmetry is investigated. Firstly, an explicit expression of H∞ norm for discrete-time symmetric system is given under the mixed H ∞ and positive real performance criterion, and this is a particular case of dissipative systems. Subsequently, we consider the control synthesis problems for such systems and obtain an explicit parameterized expression of the static output feedback controllers. Finally, two numerical examples are employed to show the effectiveness and reliableness of the proposed approach.

关键词： Linear time-invariant system

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Robust control for a class of nonlinear networked systems with stochastic communication delays via sliding mode conception

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控制理论与应用（英文版） 2010年第1期8卷 34-39页

作者： Lifeng MA Zidong WANG Xuemin CHEN Zhi GUO School of Automation Nanjing University of Science and Technology Nanjing Jiangsu 210094 China Department of Information Systems and Computing Brunel University Uxbridge Middlesex UB8 3PH UK Department of Engineering Technology Texas Southern University Houston TX 77004 USA

This paper deals with the robust control problem for a class of uncertain nonlinear networked systems with stochastic communication delays via sliding mode conception （SMC）. A sequence of variables obeying Bernoulli distribution are employed to model the randomly occurring communication delays which could be different for different state variables. A discrete switching function that is different from those in the existing literature is first proposed. Then, expressed as the feasibility of a linear matrix inequality （LMI） with an equality constraint, sufficient conditions are derived in order to ensure the globally mean-square asymptotic stability of the system dynamics on the sliding surface. A discrete-time SMC controller is then synthesized to guarantee the discrete-time sliding mode reaching condition with the specified sliding surface. Finally, a simulation example is given to show the effectiveness of the proposed method.

关键词： Sliding mode control Nonlinear systems Networked systems Stochastic communication delays

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Dynamic modeling with nonlinear inputs and backstepping control for a hexarotor micro-aerial vehicle

Dynamic modeling with nonlinear inputs and backstepping cont...

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7th Latin American Robotics Symposium and 4th Intelligent Robotics Meeting, LARS 2010

作者： Sanca, Armando S. Alsina, P.J. De Jesus F. Cerqueira, Jés Computing Engineering and Automation Department Federal University of Rio Grande do Norte Natal RN CEP 59072-970 Brazil Electrical Engineering Department Federal University of Bahia Salvador BA CEP 40210-630 Brazil

ISBN: (纸本)9780769542317

In this paper the hexarotor dynamic model with nonlinear inputs and full state backstepping technique is presented. Deadzone and saturation nonlinear inputs are considered reflected to the rotors. The goal is to obtain a faithful mathematical representation of the mechanical system for analysis and control design, not only in hover, but also in motion when take-off, land and flight for aerial navigation tasks. The model was implemented in Matlab/Simulink® to optimize the design of control system. Simulations of the hexarotor model shows the performance of the control law and stabilizes with good tracking. © 2010 IEEE.

关键词： Antennas

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Web log data clustering for a multi-agent recommendation system

Web log data clustering for a multi-agent recommendation sys...

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2010 International Conference on Machine Learning and Cybernetics, ICMLC 2010

作者： Xavier-Junior, João C. Freitas, Alex A. Canuto, Anne M.P. Gonçalves, Luiz M.G. Computing and Automation Engineering Department Federal University of Rio Grande do Norte Natal Brazil School of Computing University of Kent Canterbury Kent United Kingdom Informatics and Applied Mathematics Department Federal University of Rio Grande do Norte Natal Brazil

ISBN: (纸本)9781424465262

In this paper, we propose an automatic way of recommending information to be visualized by users. The list of information to be recommended is generated based on the web logs of the users stored by the system in a multi relational database. This system is a web-based multi-agent system which provides geographical information and monitors the actions of the users by generating logs. Frequently, the system joins the relational web log data and runs a clustering algorithm in order to recommend a list of most accessed information up to that moment to registered users who log in the system. © 2010 IEEE.

关键词： Multi agent systems

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The control system design of a gantry crane based on H∞ control theory

The control system design of a gantry crane based on H∞ con...

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Proceedings of the International Convention MIPRO

作者： Ivan Burul Fetah Kolonić Jadranko Matuško Department of Electric Machines Drives and Automation Faculty of Electrical Engineering and Computing Zagreb Croatia

This paper describes a robust controller design procedure based on H ∞ control theory for translational mechatronic system, trolley with pendulum. The goal is to achieve fast trolley positioning with minimization of pendulum swinging. This system, trolley with pendulum, represents gantry crane. Minimization of the load transfer time and load swing angle in the crane applications are conflicting control demands and thus proper control action is required. However, friction effect is unavoidable in mechanical parts of the system and significantly influences the control system performances. In this paper H ∞ theory based crane controller is designed in order to minimize friction effect. H ∞ controller has been tested and compared with the pole placement controller on a laboratory gantry crane model.

关键词： Control systems Cranes Friction Transfer functions Open loop systems Automatic control Control theory Mechatronics Safety Optimal control

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An application of compressive sensing for image fusion 10

An application of compressive sensing for image fusion

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ACM International Conference on Image and Video Retrieval, ACM-CIVR 2010

作者： Wan, Tao Qin, Zengchang Department of Electrical and Electronic Engineering University of Bristol Bristol BS8 1UB United Kingdom Intelligent Computing and Machine Learning Lab. School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781450301176

Compressive sensing(CS) has inspired significant interest because of its compressive capability and lack of complexity on the sensor side. In this paper, we present a study of three sampling patterns and investigate their performance on CS reconstruction. We then propose a new image fusion algorithm in the compressive domain by using an improved sampling pattern. There are few studies regarding the applicability of CS to image fusion. The main purpose of this work is to explore the properties of compressive measurements through different sampling patterns and their potential use in image fusion. The study demonstrates that CS-based image fusion has a number of perceived advantages in comparison with image fusion in the multiresolution (MR) domain. The simulations show that the proposed CS-based image fusion algorithm provides promising results. Copyright © 2010 ACM.

关键词： Compressed sensing

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A preliminary study on students' learning experience in an international online synchronous research seminar

A preliminary study on students' learning experience in an i...

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IADIS International Conference on Cognition and Exploratory Learning in the Digital Age, CELDA 2010

作者： Teng, Daniel Chia-En Leo, Tommaso Kinshuk Chen, Nian-Shing Department of Information Management National Sun Yat-Sen University Kaohsiung Taiwan Department of Computer Science Management and Automation Engineering Università Politecnica Delle Marche Ancona Italy School of Computing and Information Systems Athabasca University Athabasca Canada

ISBN: (纸本)9789728939281

The technology of computer-mediated synchronous communication is getting matured which makes the creation of online synchronous learning ever possible. This study reports a novel experience of holding an international online synchronous research seminar across Canada, Italy, and Taiwan, from March through June, 2010. Sixteen researchers in the field of e-learning were invited as guest speakers, and 12 doctoral students around the globe were participated in this seminar for credits. We present in this article how this online research seminar was organized, what students' learning experiences were, and the lesson we learned from students' feedback. © 2010 IADIS.

关键词： Students

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Independent Cycle Time Assignment for Min-max Systems

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International Journal of automation and computing 2010年第2期7卷 254-260页

作者： Wen-De Chen Yue-Gang Tao Hong-Nian Yu Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 PRC Department of Mathematics Zhengzhou University Henan 450001 PRC Institute of Automation Chinese Academy of Sciences Beijing 100190 PRC Faculty of Computing Engineering and Technology Staffordshire University Stafford ST16 9DG UK

A variety of problems in digital circuits, computer networks, automated manufacturing plants, etc., can be modeled as min-max systems. The cycle time is an important performance metric of such systems. In this paper, we focus on the cycle time assignment of minimax systems which corresponds to the pole assignment problem in traditional linear control systems. For the min- max system with max-plus inputs and outputs, we show that the cycle time can be assigned disjointedly by a state feedback, if and only if the system is reachable. Furthermore, a necessary and sufficient condition for the cycle time to be assigned independently by a state feedback is given. The methods are constructive, and some numerical examples are given to illustrate how the methods work in practice.

关键词： Cycle time coloring graph independent assignment min-max systems state feedback.

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Taking advantage of infrared camera for temperature measurement of asynchronous machines

Taking advantage of infrared camera for temperature measurem...

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Proceedings of the International Convention MIPRO

作者： Hana Kuchynkova Vitezslav Hajek Faculty of Electrical Engineering and Computing Department of Electric Machines Drives and Automation Brno Czech Republic

The paper deals with utilization of infrared camera for temperature measurement of electrical machines. There is described the non-contact temperature measuring, and principle of sensors that evaluate quantity of incident infrared radiation. In the next part there is thermovision camera SAT-HY 6800 presented and the instructional manual for SAT Report computer programme created. This computer programme is used for analyzing of thermovision pictures from the SAT-HY 6800 thermovison camera. The paper contains description of temperature measuring of one-phase asynchronous motor type J22TO484. The last part of the thesis describes creation of animation of one-phase asynchronous motor type J22TO455. The animation is created in 3ds Max computer programme. The results and animation would be used either as addition in daily studies or as the replace of tutorial in combined form of study.

关键词： Cameras Temperature measurement Temperature sensors Animation Area measurement Optical fiber communication Infrared sensors Surface finishing Temperature dependence Temperature distribution

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Spectral calculation of the output voltage of an inverter with unipolar pulse width modulation

Spectral calculation of the output voltage of an inverter wi...

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Proceedings of the International Convention MIPRO

作者： Ivan Mrćela Viktor Šunde Zvonko Benčic Faculty of Electrical Engineering and Computing Department of Electric Machines Drives and Automation Zagreb Croatia Department of Electric Machines Drives and Automation Zagreb Republic of Croatia

Inverters with pulse width modulation are used for connecting DC and AC networks, e.g. in uninterrupted power supply systems, AC electromotor drives, for powering induction furnaces, in audio technique. The output voltage spectrum of inverters with unipolar pulse width modulation in the case of triangular carrier signal contains a harmonic with frequency equal to the frequency of the modulating signal. It also contains harmonics with frequencies equal to the sum of frequency of the modulating signal and a multiple of double the frequency of the carrier signal. Analysis of the inverter's output voltage harmonics was performed in time domain via development of the inverter's output voltage waveform into a sum of periodical waveforms and by calculating spectrums of each individual part. The dependency of the amplitudes and frequency spectra on the wave forms of the carrier signal and modulating signal was demonstrated.

关键词： Pulse width modulation inverters Voltage Pulse inverters Pulsed power supplies Frequency modulation Joining processes Furnaces Harmonic analysis Performance analysis Time domain analysis

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