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Design of an autonomous control for parallel-connected uninterruptible power supplies

IEEJ Transactions on Industry Applications 2006年第4期126卷 444-452+11页

作者： Sato, Eduardo Kazuhide Kawamura, Atsuo Division of Advanced Physics Electrical and Computer Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan IEICE Japan IEEE Japan Department of Electrical and Computer Engineering Yokohama National University Yokohama Japan Robotics Society of Japan Japan Institute of Electronics Information and Communication Engineers Japan Society of Instrument and Control Engineering Japan Yokohama National University Japan

This paper proposes an autonomous control for parallel-connected uninterruptible power supply (UPS) systems based on electrical power system interrelations. The controllable variables are the output voltage phase angle and magnitude. Relation between active current and output voltage phase angle is derived from a synchronous machine model. Electrical power systems suggest that voltage regulation and reactive current can be proportionally related to yield another control equation. The resulted control scheme is very simple and only requires an output current measurement to provide a voltage reference signal locally in synchronism with other UPSs without communication signal exchange. A small-signal model represents the entire system and constitutes proof of its stability. Feasibility is confirmed by an experimental setup with three UPSs connected in parallel with different output power ratings. In the experiments, voltage limiters (1%) are employed and three cases are verified. Under all conditions, the results show excellent performance in terms of stability, and active and reactive load sharing.

关键词： Uninterruptible power systems

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Preliminary Evaluation of Recommended Airline Exercises for Optimal Calf Muscle Pump Activity

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EJVES Extra 2006年第1期12卷 1-5页

作者： Bajd, T. Grace, P.A. Lyons, G.M. Biomedical Electronics Laboratory Department of Electronic and Computer Engineering University of Limerick Limerick Ireland Laboratory of Robotics and Biomedical Engineering Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia Vascular Imaging Laboratory Department of Vascular Surgery Mid-Western Regional Hospital Limerick Ireland

Objectives: A preliminary study to investigate which of the recommended airline exercises for DVT prevention produce optimal calf muscle pump activity. Methods: Four subjects were instructed to carry out ten lower leg exercises based on those recommended by airlines for DVT prevention. An EMG sensor was used to record calf muscle activity and a motion analysis system was used to ensure the exercise was conducted correctly. Results: Statistical analysis showed significant differences in the level of calf muscle pump activity induced by the different exercises. Heel rise foot pumps were shown to induce highest levels of activity while many exercises did not induce any significant calf muscle activity at all. Conclusion: These findings indicate that a further, more detailed examination of the exercises recommended to passengers for DVT prevention on long distance flights should be conducted to determine the potential benefit to the health and safety of the passenger. © 2006 Elsevier Ltd. All rights reserved.

关键词： Calf Muscle Pump Deep Vein Thrombosis (DVT) Exercise Lower Leg Prevention

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An investigation of recommended lower leg exercises for induced calf muscle activity

An investigation of recommended lower leg exercises for indu...

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4th IASTED International Conference on Biomedical engineering

作者： O'Donovan, Karol J. Bajd, Tadej Grace, Pierce A. O'Keeffe, Derek T. Lyons, Gerard M. Biomedical Electronics Laboratory Department of Electronic and Computer Engineering University of Limerick Limerick Ireland Laboratory of Robotics and Biomedical Engineering Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia Vascular Imaging Laboratory Department of Vascular Surgery Mid-Western Regional Hospital Limerick Ireland

ISBN: (纸本)0889865787

Active voluntary contraction of the calf muscle is an essential factor in the circulatory system. Failure to exercise the calf muscles for prolonged periods may result in limited or poor blood circulation in the lower leg and increase the risk of deep vein thrombosis (DVT). An association between long distance travel and increased risk of DVT has been established. Most airlines recommend a number of lower leg exercises as a DVT preventative measure. Not all lower leg exercises induce calf muscle pump activity and therefore may not be beneficial in the prevention of DVT. A study was devised to investigate the exercises recommended to passengers for DVT prevention on long distance flights to determine a potential benefit to the health and safety of the passenger. The technique used for the evaluation of recommended airline exercises for optimal calf muscle pump activity is described.

关键词： Biomedical engineering

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Fast Image Retrieval Based on Attributes of the Human Visual System

Fast Image Retrieval Based on Attributes of the Human Visual...

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Proceedings of the Nordic Signal Processing Symposium (NORSIG)

作者： Georgios Panitsidis Konstantinos Konstantinidis Vasileios Vonikakis Ioannis Andreadis Antonios Gasteratos Laboratory of Electronics Department of Electrical & Computer Engineering Democritus University of Thrace Greece Laboratory of Robotics and Automation Department of Production & Management Engineering Democritus University of Thrace Greece

In this paper we present a new method for content-based image retrieval (CBIR), based on the retinal signal processing of the human visual system (HVS). A center-surround operator similar to the receptive fields of the ganglion cells of the retina is employed to create a new form of color histogram, the center-surround histogram (CSH). Unlike other proposed color histograms, the CSH takes into consideration only the visual signal surrounding the zero-crossings of an image. This reduces the processed amount of visual information and minimizes the computational burden. Furthermore, a combination of spatial and chromatic information of the image is also achieved. The method is compared to other contemporary methods for image retrieval, exhibiting better results in shorter computational times

关键词： Image retrieval Humans Visual system Histograms Retina Laboratories Content based retrieval Multimedia databases Image databases robotics and automation

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Development of a Sensor System for Outdoor Service Robot

Development of a Sensor System for Outdoor Service Robot

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SICE Annual Conference

作者： Takeshi Nishida Yuji Takemura Yasuhiro Fuchikawa Shuichi Kurogi Shuji Ito Masayuki Obata Norio Hiratsuka Hidekazu Miyagawa Yasuhiro Watanabe Toshinori Suehiro Yoshinori Kawamura Fujio Ohkawa Faculty of Engineering Kyushu Institute of Technology Fukuoka Japan YASKAWA INFORMATION SYSTEMS Corporation Fukuoka Japan Mechanics and Electronics Research Institute Fukuoka Industrial Technology Center Fukuoka Japan Fukuoka Industry Science and Technology Foundation Fukuoka Japan FAIS Robotics Research Institute Fukuoka Japan Faculty of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan

The outdoor service robot, which we call OSR-02, is presently under development intended for cleaning up urban areas by means of collecting discarded trash such as plastic bottles, cans, plastic bags and so on. Additionally, we have developed a novel sensor system for the achievement of the task by this robot; it is constructed with LRF (laser rangefinder), two cameras, and three stepping motors. In this paper, we describe the sensor system and its applications

关键词： Sensor systems Service robots Cameras Robot vision systems Robot sensing systems Robot kinematics computer industry electronics industry Plastics industry Cleaning

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Development of Outdoor Service Robots

Development of Outdoor Service Robots

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SICE Annual Conference

作者： Takeshi Nishida Yuji Takemura Yasuhiro Fuchikawa Shuichi Kurogi Shuji Ito Masayuki Obata Norio Hiratsuka Hidekazu Miyagawa Yasuhiro Watanabe Fumitaka Koga Toshinori Suehiro Yoshinori Kawamura Yoshimitsu Kihara Takashi Kondo Fujio Ohkawa Fuculty of Engineering Kyushu Institute of Technology Fukuoka Japan YASKAWA INFORMATION SYSTEMS Corporation Fukuoka Japan Mechanics & Electronics Research Institute Fukuoka Industrial Technology Center Fukuoka Japan Fukuoka Industry Science & Technology Foundation Fukuoka Japan FAIS Robotics Research Institute Fukuoka Japan Kihara Iron Works Fukuoka Japan Fuculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

The outdoor service robots which we call OSR-01 and OSR-02 are presently under development intended for cleaning up urban areas by means of collecting discarded trash such as plastic bottles, cans, plastic bags and so on. In this paper, we mainly describe the architecture of OSR-02 which consists of hardware such as sensors, a manipulator, crawler structure, etc. for searching and picking up trash. After describing the systems, we show the result of open experiments in which OSR-02 collected plastic bottles in the special zone for robot research and development in Kitakyushu-city

关键词： Service robots Plastic products Cleaning Urban areas Hardware Sensor phenomena and characterization Manipulators Crawlers Robot sensing systems Research and development

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Preliminary Evaluation of Recommended Airline Exercises for Optimal Calf Muscle Pump Activity

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European Journal of Vascular and Endovascular Surgery 2006年第3期32卷 340-340页

作者： K.J. O'Donovan T. Bajd P.A. Grace D.T. O'Keeffe G.M. Lyons Biomedical Electronics Laboratory Department of Electronic and Computer Engineering University of Limerick Limerick Ireland Laboratory of Robotics and Biomedical Engineering Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia Vascular Imaging Laboratory Department of Vascular Surgery Mid-Western Regional Hospital Limerick Ireland

Objectives A preliminary study to investigate which of the recommended airline exercises for DVT prevention produce optimal calf muscle pump activity. Methods Four subjects were instructed to carry out ten lower leg exercises based on those recommended by airlines for DVT prevention. An EMG sensor was used to record calf muscle activity and a motion analysis system was used to ensure the exercise was conducted correctly. Results Statistical analysis showed significant differences in the level of calf muscle pump activity induced by the different exercises. Heel rise foot pumps were shown to induce highest levels of activity while many exercises did not induce any significant calf muscle activity at all. Conclusion These findings indicate that a further, more detailed examination of the exercises recommended to passengers for DVT prevention on long distance flights should be conducted to determine the potential benefit to the health and safety of the passenger.

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Planar homography: accuracy analysis and applications

Planar homography: accuracy analysis and applications

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IEEE International Conference on Image Processing

作者： S. Negahdaripour R. Prados R. Garcia Department Electrical and Computer Engineering University of Miami Coral Gables FL USA Computer Vision and Robotics Group Department of Electronics Informatics and Automation University of Girona Spain

Projective homography sits at the heart of many problems in image registration. In addition to many methods for estimating the homography parameters (R.I. Hartley and A. Zisserman, 2000), analytical expressions to assess the accuracy of the transformation parameters have been proposed (A. Criminisi et al., 1999). We show that these expressions provide less accurate bounds than those based on the earlier results of Weng et al. (1989). The discrepancy becomes more critical in applications involving the integration of frame-to-frame homographies and their uncertainties, as in the reconstruction of terrain mosaics and the camera trajectory from flyover imagery. We demonstrate these issues through selected examples.

关键词： Cameras robotics and automation Image reconstruction Layout Equations Application software computer vision Robot vision systems Informatics Heart

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Scalable temporal interest points for abstraction and classification of video events

Scalable temporal interest points for abstraction and classi...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： Seung-Hoon Han ln-So Kweon Digital Media R&D Center Samsung Electronics Company Limited South Korea Robotics and Computer Vision Laboratory Division of Electrical Engineering Department of EECS Korea Advanced Institute of Science and Technology South Korea

The image sequence of a static scene includes similar or redundant information over time. Hence, motion-discontinuous instants can efficiently characterize a video shot or event. However, such instants (key frames) are differently identified according to the change of velocity and acceleration of motion, and such scales of change might be different on each sequence of the same event. In this paper, we present a scalable video abstraction in which the key frames are obtained by the maximum curvature of camera motion at each temporal scale. The scalability means dealing with the velocity and acceleration change of motion. In the temporal neighborhood determined by the scale, the scene features (motion, color, and edge) can be used to index and classify the video events. Therefore, those key frames provide temporal interest points (TIPs) for the abstraction and classification of video events.

关键词： Layout Acceleration Cameras Humans Research and development Robot vision systems computer vision Laboratories Image sequences Scalability

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An intelligent system for Aerial image Retrieval and Classification

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3rd Hellenic Conference on Artificial Intelligence, SETN 2004

作者： Gasteratos, Antonios Zafeiridis, Panagiotis Andreadis, Ioannis Laboratory of Robotics and Automation Section of Production Systems Department of Production and Management Engineering Democritus University of Thrace Building of University’s Library Kimmeria XanthiGR-671 00 Greece Laboratory of Electronics Section of Electronics and Information Systems Technology Department of Electrical and Computer Engineering Democritus University of Thrace Vassilisis Sophias 12 XanthiGR-671 00 Greece

ISBN: (纸本)3540219374

Content based image retrieval is an active research area of pattern recognition. A new method of extracting global texture energy descriptors is proposed and it is combined with features describing the color aspect of texture, suitable for image retrieval. The same features are also used for image classification, by its semantic content. An exemplar fuzzy system for aerial image retrieval and classification is proposed. The fuzzy system calculates the degree that a class, such as sea, clouds, desert, forests and plantations, participates in the input image. Target applications include remote sensing, computer vision, forestry, fishery, agricultures, oceanography and weather forecasting. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Fuzzy systems

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