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IEEE International Conference on Systems, Man and Cybernetics

作者： Dorothea Pantförder Birgit Vogel-Heuser Chair of Embedded Systems Faculty of Electrical Engineering/Computer Science University of Kassel Kassel Germany Institute of Information Technology in Mechanical Engineering Faculty of Mechanical Engineering Technische Universität München Munich Germany

Operator training without a process model is necessary in certain plant manufacturing industry's applications because the process models from the control theory perspective are still not available. This paper describes an experiment that analyzed the benefits of 3D data visualization integrated in HMI for process control in combination with different types of operator training to obtain process knowledge. The benefits of interactive 3D slider training in identifying errors during operation could be proven.

关键词： Data visualization Industrial training Manufacturing industries Process control Mechanical engineering Libraries Data analysis Cybernetics USA Councils Embedded system

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Accelerating authenticated emergence message propagation to mitigate chain-reaction accidents in highway traffic

Accelerating authenticated emergence message propagation to ...

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International Conference on Communications and Networking in China (CHINACOM)

作者： Rongxing Lu Xiaodong Lin Haojin Zhu Xuemin Shen Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada Faculty of Business and Information Technology Institute of Technology University of Ontario Oshawa ONT Canada Department of Computer Science and Engineering Shanghai Jiaotong university Shanghai China

ISBN: (纸本)9781424443369

The chain-reaction collision caused by a sudden event such as deer-vehicle collision is a serious accident in highway traffic. By propagating the authenticated emergence message on deer-vehicle collision with vehicle-to-vehicle (V2V) communication, the chain-reaction accident could be mitigated. However, the long delay imposed by traditional signature based authentication may weaken the effectiveness of such message propagation. In this paper, in order to accelerate the propagation, we propose a new online/offline Rabin signature scheme integrated in an authenticated emergence message propagation model. With the proposed signature scheme, the emergence message can be quickly signed and verified, and thus the propagation is accelerated. Extensive simulation results also demonstrate the effectiveness of the proposed scheme.

关键词： Acceleration Road accidents Road transportation Road vehicles Collision mitigation Statistics Road safety Digital signatures Propagation delay Authentication

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A successive method for designing an observer-based strictly positive real H2 controller

A successive method for designing an observer-based strictly...

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Asian Control Conference

作者： Yasushi Kami Kenji Mitsui Eitaku Nobuyama Department of Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Faculty of Engineering Gifu University Gifu Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781424454402

This paper is concerned with a strictly positive real H 2 controller design problem using an observer-based controller with Kalman filter gain. In this paper, we propose a successive method with non-common Lyapunov variables for this control problem. The feature of our method is to construct a controller sequence on which H 2 norm is monotonically non-increasingly while all controllers are strictly positive real. A numerical example shows the efficiency of our method.

关键词： Design methodology Control systems Robust stability Hydrogen Optimal control Linear matrix inequalities Closed loop systems Electric variables control Educational institutions State-space methods

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Image forensics using generalised Benford's Law for accurate detection of unknown JPEG compression in watermarked images

Image forensics using generalised Benford's Law for accurate...

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International Conference on Digital Signal Processing (DSP)

作者： Xi Zhao Anthony T.S. Ho Yun Q. Shi Department of Computing Faculty of Engineering and Physical Sciences University of Surrey Guildford Surrey UK Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

In the past few years, semi-fragile watermarking has become increasingly important as it can be used to verify the content of images and to localise the tampered areas, while tolerating some non-malicious manipulations. In the literature, the majority of semi-fragile algorithms have applied a predetermined threshold to tolerate errors caused by JPEG compression. However, this predetermined threshold is typically fixed and cannot be easily adapted to different amounts of errors caused by unknown JPEG compression at different quality factors (QFs) applied to the watermarked images. In this paper, we analyse the relationship between QF and threshold, and propose the use of generalised Benford's Law as an image forensics technique for semi-fragile watermarking, to accurately detect the unknown QF of the images. The results obtained show an overall average QF correct detection rate of approximately 99% when 5% of the pixels are subjected to image content tampering, as well as compression using different QFs (ranging from 95 to 65). Consequently, our proposed image forensics method can adaptively adjust the threshold for images based on the estimated QF, therefore, improving the accuracy rates in authenticating and localising the tampered regions for semi-fragile watermarking.

关键词： Forensics Transform coding Image coding Watermarking Signal processing algorithms Physics computing Image storage Authentication Digital images Q factor

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Infrared Ellipsometry Investigation of Hydrogenated Amorphous Silicon

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MRS Online Proceedings Library 2009年第1期1153卷 1-6页

作者： Franco Gaspari Anatoli Shkrebtii Tom Tiwald Andrea Fuchser Shafiq Mohammed Tome Kosteski Nazir Kherani Keith Leong Faculty of Science University of Ontario Institute of Technology Oshawa Canada J.A. Woollam Co. Inc. Lincoln USA Dept. of Electrical & Computer Engineering University of Toronto Toronto Canada

Hydrogenated amorphous silicon (a-Si:H) has been extensively investigated experimentally in the infrared spectral region via techniques such as Fourier Transform Infrared (FTIR) and Raman spectroscopy. Although spectroscopic ellipsometry has been proven to be an important tool for the determination of several parameters of a-Si:H films, including dielectric constant, surface roughness, doping concentration and layer thickness, the spectral range used in these studies has rarely covered the infrared region below 0.6 eV, and never over the complete spectral region of interest (0.04 – 0.3 eV). We have measured for the first time the dielectric function of a-Si:H films grown by the saddle field glow discharge technique by spectroscopic ellipsometry in the energy range from 0.04 eV to 6.5 eV, thus extending the analysis into the far infrared region. The a-Si:H films were deposited on germanium substrates for the ellipsometry studies, and on crystalline silicon substrates for the comparative FTIR analysis. Preparation parameters were chosen to obtain films with different hydrogen content. In this paper, we present the results of the ellipsometry analysis, evaluate different fitting techniques, and compare the results with the corresponding FTIR spectra. The similarities and differences between the spectra are discussed in terms of the a-Si:H properties.

关键词： infrared (IR) spectroscopy amorphous Si

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Efficient entropy-based features selection for image retrieval

Efficient entropy-based features selection for image retriev...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Tsun-Wei Chang Yo-Ping Huang Frode Eika Sandnes Department of Computer Science and Information Engineering De Lin Institute of Technology Tucheng Taipei Taiwan Department of Electrical Engineering National Taipei University of Technology Taipei Taiwan Faculty of Engineering Oslo University College Oslo Norway

Information retrieval systems should provide users quick access to desired information. There are no established ways for inexperienced users to explicitly express queries for retrieving images from ecological databases. This study proposes an entropy-based feature selection strategy for finding images of interest from databases. Six visual features are used to represent birds, and hence used to formulate search queries. The proposed method is tested on a real world bird database and the experimental results demonstrate the effectiveness of the presented work.

关键词： Image retrieval Birds Information retrieval Image databases Spatial databases Visual databases Content based retrieval Feature extraction Ontologies Cybernetics

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A multiple-input SC DC-DC converter with battery charge process

A multiple-input SC DC-DC converter with battery charge proc...

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2nd International Conference on Intelligent Networks and Intelligent Systems, ICINIS 2009

作者： Eguchi, Kei Pongswatd, Sawai Zhu, Hongbing Tirasesth, Kitti Sasaki, Hirofumi Inoue, Takahiro Department of Technology Education Shizuoka University 836 Ohya Shizuoka 422-8529 Japan Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Ladkrabang Bangkok 10525 Thailand Department of Computer Science Hiroshima Kokusai Gakuin University 6-20-1 Nakano Hiroshima 739-0321 Japan School of Industrial Engineering Tokai University 9-1-1 Toroku Kumamoto 862-8652 Japan Department of Electrical and Computer Engineering Kumamoto University 2-40-1 Kurokami Kumamoto 860-8555 Japan

ISBN: (纸本)9780769538525

Aimed at a backlighting application, a multiple-input switched-capacitor (SC) DC-DC converter with battery charge process is proposed in this paper. Unlike conventional SC power converters such as a Dickson-type converter, etc., the proposed converter drives some LEDs by converting energy from solar cells when solar cells offer enough energy. Furthermore, the proposed converter can charge a lithium battery when an output load is light. Hence, the proposed converter enables us to realize long battery runtime. The validity of circuit design is confirmed by theoretical analyses, simulations, and experiments. The derived theoretical formulas will be helpful to estimate circuit characteristics, because theoretical results agree well with SPICE simulation results. © 2009 IEEE.

关键词： Solar cells

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From state-of-the-art static fleet assignment to flexible stochastic planning of the future

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作者： Grothklags, Sven Lorenz, Ulf Monien, Burkhard Lufthansa Systems Berlin GmbH Airline Planning and Control Salzufer 8 D-10587 Berlin Germany Darmstadt University of Technology Institute of Mathematics Schlossgartenstr. 7 D-64289 Darmstadt Germany University of Paderborn Faculty of Computer Science Electrical Engineering and Mathematics Fürstenallee 11 D-33102 Paderborn Germany

ISBN: (纸本)3642020933

Given a flight schedule, which is a set of non-stop flights, called legs, with specified departure and arrival times, and a set of aircraft types, called subfleets, the fleet assignment problem is to determine which aircraft type should fly each leg. The objective is to maximize the overall profit. Usually, planners assume that precise input data are determininstically available at planning time. As a consequence, an important insufficiency of modern industrial plans, especially flight-plans, is their lack of robustness. Disruptions prevent from operating as planned before and induce high costs for trouble shooting. One reason for the uncertainties in the data for fleet assignment is that this problem is part of a long row of optimization problems of an airline. Therefore, important restrictions of later steps like connection dependent ground times should be considered in the fleet assignment problem. We show how connection dependent ground times can be added to the fleet assignment problem and presents three optimization methods, varying in run time and solution quality, that can solve real-world problem instances with more than 6000 legs within minutes. Moreover, real or believed non-determinism leads to inevitable uncertainties in input data. As a consequence, instead of a traditional plan, a flexible strategy which reacts on different relizations of the uncertain data is demanded. The Repair Game is a formalization of a planning task, and playing it performs disruption management and generates robust plans with the help of game tree search. We introduce the game and present experimental results of a feasibility study. © 2009 Springer Berlin Heidelberg.

关键词： Stochastic systems

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Design of a Step-Down AC-DC Converter for Energy Harvesting System Using Vibration-Based Energy

Design of a Step-Down AC-DC Converter for Energy Harvesting ...

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International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Kei Eguchi Sawai Pongswatd Hirofumi Sasaki Kitti Tirasesth Tatsuya Sugimura Takahiro Inoue Department of Technology Education Shizuoka University Japan Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand School of Industrial Engineering Tokai University Japan Department of Electrical and Computer Engineering Kumamoto University Japan

To realize battery-free operation employing energy harvesting, a step-down switched-capacitor-based converter has been used as a vibration-to-electricity converter. In this paper, to improve power efficiency, a step-down ACDC converter realizing 1/N (N=2,3,... ) conversion modes is designed by using switched-capacitor techniques. Although conventional converters offer an output by regulating the stored energy in a big capacitor, the proposed converter generates the output by performing AC-DC conversion. Thus, the proposed converter can improve power efficiency. Concerning the power efficiency, the effectiveness of the proposed converter is clarified by theoretical analysis. Furthermore, the validity of the circuit design is confirmed by simulations and experiments.

关键词： AC-DC power converters Voltage Educational technology Analog-digital conversion Switching converters Wireless sensor networks Switches Vibration control Control engineering education Systems engineering education

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Regularization of Complex SAR Images Using Markov Random Fields

Regularization of Complex SAR Images Using Markov Random Fie...

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International Conference on Systems, Signals and Image Processing, IWSSIP

作者： Dusan Gleich Peter Planinsic Matej Kseneman Matteo Soccorsi Mihai Datcu Faculty of Electrical Engineering and Computer Science Remote sensing center University of Maribor Maribor Slovenia German Aerospace Center Remote Sensing Technology Institute Wessling Germany

This paper presents despeckling and information extraction using non-quadratic regularization. The novelty of this paper is that instead of the Gaussian prior model a Gauss-Markov random field model is chosen, because it can efficiently model textures in the images. The iterative procedure consists of noise-free image and texture parameter. The experimental results show that the proposed method satisfactorily removes noise form synthetic and real SAR images and is comparable with the state of the art methods using objective measurements on synthetic SAR images.

关键词： Markov random fields Speckle Bayesian methods Cost function Synthetic aperture radar Remote sensing Gaussian processes Layout Adaptive filters Parameter estimation

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