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作者： Munggonrit, Sittichai Konghirun, Mongkol Tungpimolrut, Kanokvate Faculty of Engineering Department of Electrical Engineering Tungkru Bangkok 10140 Thailand National Electronics and Computer Technology Center 112 Phahon Yothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand

ISBN: (纸本)9788986510119

The high-resolution encoder is typically used to detect the rotor position in Permanent-Magnet Synchronous Motor (PMSM) drive (AC servo drive) in many high performance applications where the high-precision position and extremely low speed controls are required. Therefore, the overall cost of such drive system is generally very expensive. This drive is absolutely not be attractive for low-cost applications where the speed control may be operating in the middle or high speed range. To reduce the cost, the high-resolution encoder may be replaced by the low-resolution encoder. In this paper, the implementation of speed controlled PMSM drive using low-resolution encoder down to 12 and 24 pulses/rev (or 3 and 6 pulses/electrical period for 8-pole PMSM, respectively) for lowcost applications is thus proposed. The extrapolation technique is primarily adopted to increase the position resolution in both rotational directions and under the step load condition. The details of the overall drive system are given. Both simulation and experimental results are finally provided to validate the implementing system on a fixed-point TMS320F2812 DSP controller.

关键词： Speed

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On non-contiguous multicarrier waveforms for spectrally opportunistic cognitive radio systems

On non-contiguous multicarrier waveforms for spectrally oppo...

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International Waveform Diversity and Design Conference

作者： Pagadarai, Srikanth Kliks, Adrian Bogucka, Hanna Wyglinski, Alexander M. Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA 01609-2280 United States Faculty of Electronics and Telecommunications Poznan University of Technology ul. Polanka 3 60-965 Poznan Poland

ISBN: (纸本)9781424482009

Multicarrier modulation is well suited for future wireless communication systems due to its ability to opportunistically transmit across unoccupied frequency bands. In addition to multicarrier modulation being able to attain high data rates with a sufficient level of error robustness, it also has the potential to achieve transmission flexibility via the non-contiguous access of wireless spectrum. In this paper, we shall investigate two approaches for enabling non-contiguous multicarrier modulation that can be used to facilitate spectrally opportunistic cognitive radio systems. One of the approaches is a variant of orthogonal frequency division multiplexing (OFDM), called non-contiguous OFDM (NC-OFDM), while the other approach is based the noncontiguous version of the filter bank approach non-orthogonal frequency division multiplexing (NOFDM), referred to as noncontiguous NOFDM (NC-NOFDM). The performance of these two approaches is assessed in terms of interference mitigation, which involves the use of actual spectrum measurement data, as well as computational complexity. ©2010 IEEE.

关键词： Orthogonal frequency division multiplexing

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Image measurement of hand dimensions based on anatomical structure and creases

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on electronics, Information and Systems 2010年第4期130卷 686-695+19页

作者： Takahashi, Takuya Aoki, Yoshimitsu Kouchi, Makiko Mochimaru, Masaaki Department of Electrical Engineering and Computer Science Shibaura Institute of Technology Graduate School of Engineering 3-7-5 Koto-ku Toyosu Tokyo 134-8548 Japan Department of Electronics and Electrical Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kouhoku-ku Yokohama 223-8522 Japan Digital Human Research Center National Institute of Advanced Industrial Science and Technology 2-41-6 Koto-ku Aomi Tokyo 135-0064 Japan

A hand version of the computer manikin, called "digital hand", is considered as an effective assessment tool for hand-operated products at the design stage. In order to construct various sizes and proportions of hands in a computer, it is required to develop the system that can measure the accurate dimensions of hands automatically. In this paper, an image-based measurement system of hand dimensions has been proposed. The system utilizes an image scanner for acquiring a hand image in 2D. First, the joint positions of fingers are estimated by extracting the edges of the wrinkles on a palm and fingers in this image. For this process, anatomical constraint is effectively considered. Then, the 2D dimensions of a hand are automatically calculated. In addition, based on the fact that the dimensions of a hand are highly correlated each other, the system estimates the 3D measures of a hand, such as the thickness and circumference of fingers and a palm by regression analysis. The accuracy and reproducibility was validated using the proposed system by comparison with actual results measured by traditional method. The results prove our system has enough capability for actual hand measurement and its applications. © 2010 The Institute of Electrical Engineers of Japan.

关键词： Regression analysis

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Shot Noise Behavior of Planar Mo/n-Si/Mo Photodetector Structure in Avalanche Mode

Shot Noise Behavior of Planar Mo/n-Si/Mo Photodetector Struc...

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electronics, computer, Telecommunications and Information technology International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology

作者： S. Khunkhao C. Umjaman A. Thaworn S. Nuanloy S. Nieracharoen A. Ruangphanit N. Phongphanchanthra K. Sato Department of Electrical Engineering Faculty of Engineering Seripatim University Department of Electrical Engineering Faculty of Engineering Sripatum University Electronics Research Center Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Thai Microelectronics Center(TMEC) National Electronics and Computer Technology(NECTEC) Department of Electronics School of Information Technology and Electronics Tokai University

ISBN: (纸本)9781424456062

Low-frequency (3 to 50 kHz) shot noise behavior of planar metal/semiconductor/metal photodetector (MSM-PD) structure operating under pre avalanching and avalanching conditions has been observed. The structure examined is Mo/n-Si/Mo structure with electrode separation of 20μm. In higher voltages applied, both device current and its photocurrent component showed a rapid increase at a critical bias voltage due to onset of avalanche multiplication. It was found that the associated shot noise factor F~2 varies in wide range from the order Of 0.1 at pre-breakdown conditions to three orders of magnitude larger than unity corresponding to simple shot noise by avalanche multiplication. This result implies that the biasing condition for appropriate operation must be satisfied from the view point of signal-to noise ratio (S/N), when one operates this structure with high optical sensitivity. The value of noise factor obtained seems basically expressible by using existing theory with a little smaller exponent of multiplication factor.

关键词： Planar metal/semiconductor/metal photodetector Avalanche multiplication Shot noise factor Sub-shot noise Avalanche photodiode Schottky barrier

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Earliest computer vision systems in Poland

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Advances in Intelligent and Soft Computing 2010年 84卷 3-13页

作者： Tadeusiewicz, Ryszard Faculty of Electrical Engineering Automatic Control Computer Science and Electronics Department of Automatic Control AGH University of Science and Technology Poland

ISBN: (纸本)9783642162947

In the paper is presented the brief history of research conducted in Poland (at AGH University) in the area of image processing, analysis and recognition. The history is connected with changes of the technology used for problem solving. First systems are build from the separate integrated circuits of low and medium scale of integration, after this we develop some systems build on the base of VLSI elements, and now the new systems are constructed on the base of FPGA technology. Nevertheless all the time scientific group from AGH was conducted research in technological applications of vision systems. At 70th and 80th years of XX century it was pioneer works devoted to building of second in Poland and one of the first in Europe systems for computer processing of the images, now research is dedicated mainly toward real time image processing systems. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： Problem solving

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Multi-objective traffic grooming in WDM network using NSGA-II approach

Multi-objective traffic grooming in WDM network using NSGA-I...

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International Conference on Networked Computing (INC)

作者： P. Leesutthipornchai C. Charnsripinyo N. Wattanapongsakorn Department of Computer Engineering Faculty of Engineering King Mongkut''s University of Technology Thonburi Bangkok Thailand National Electronics and Computer Technology Center Pathum Thani Thailand

ISBN: (纸本)9781424469864;9788988678206

This paper considers a multi-objective network design problem for the traffic grooming, routing and wavelength assignment (GRWA) in WDM networks. The design objectives are to maximize the number of accepted communication requests (source-destination pairs) as well as to minimize the number of wavelength channel requirement. Both the design objectives are conflicted to each other; maximizing the number of accepted commodities will require a large number of wavelength channels while minimizing the number of wavelength channels will limit the amount of accepted commodities. To solve the multi-objective network design problem, we apply a fast and efficient optimization technique called "Fast Non-dominated Sorting Genetic Algorithm (NSGA-II)". In this paper, traffic grooming (GA-LMF) and non-traffic grooming (GA-MDF and FAR-FF) algorithms are compared and benchmarked for solving the multi-objective design problem. The results show that the GA-LMF is the most flexible and efficient grooming technique. The obtained solutions from the GA-LMF are spread on the objective space and are better than those from other non-grooming techniques in both objective values (i.e., number of accepted commodities and wavelength channels required).

关键词： Telecommunication traffic WDM networks Wavelength assignment Wavelength routing Costs Wavelength division multiplexing computer networks Throughput Bandwidth Algorithm design and analysis

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Algorithm for decreasing nonlinear gamma effect with digital fringe projection images

Algorithm for decreasing nonlinear gamma effect with digital...

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International Conference on ICT and Knowledge engineering

作者： Sasin Tiendee Sarun Sumriddetchkajorn Charay Lerdsudwichai Chanjira Sinthanayothin Computer Engineering Department Faculty of Engineering Kasetsart University Bangkok Thailand National Electronics and Computer Technology Center Nation Science and Technology Development Agency Pathumthani Thailand

Digital fringe projection using a digital projector is an extensively technique used for 3D surface profile. Fringe pattern images projected by digital projector, appear nonlinear gamma effect. This effect is an error of digital projector, which gamma of the fringe pattern images is not stable. The nonlinear gamma effect demonstrates strip on 3D surface image which is a significant error. Therefore, this paper proposed an algorithm for decreasing nonlinear gamma effect in digital fringe projection. First, fringe pattern images were captured by digital camera, which composed of object and background images. These images suppose to have no distortion by a digital camera. Then, the background image in y axis of image plane was used to compare between real phase and ideal phase. Output of the process was a phase different data which could be use for phase compensation on phase values of fringe pattern images. Finally, the nonlinear gamma effect could decrease by our proposed algorithm. To verify, the fringe pattern images from laboratory, which have nonlinear gamma effect, were used to compute by the proposed algorithm. Result showed smoothly and truthfully 3D surface image. Addition, the proposed algorithm can be a real time processing and independent with any digital projector and digital camera.

关键词： Three dimensional displays Digital cameras Table lookup Mathematical model Surface reconstruction Solid modeling Filtering algorithms

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Mental and Spiritual Relaxation by Recitation of the Holy Quran

Mental and Spiritual Relaxation by Recitation of the Holy Qu...

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International Conference on computer Research and Development (ICCRD)

作者： Nawsher Khan Noraziah bt Ahmad A.H. Beg M.A.I. Fakheraldin Ahmed N Abd Alla Muhammad Nubli Faculty of Computer System and Software Engineering Universiti Malaysia Pahang Malaysia Faculty of Electrical & Electronics Engineering Faculty of Technology Management Universiti Malaysia Pahang Malaysia

ISBN: (纸本)9781424469925;9780769540436

Nowadays, Tension or Stress is a common and serious problem in our Global Village. Stress and stress related factors contribute to tension and reduced ability to handle life's everyday challenges. This paper proposes a new method to reduce the stress and tension of our life and also proves that mentally, spiritually and physically relaxation can be achieved by the recitation of the holy Quran. In this technique of listening, reading and watching the text of the Holy Quran subject (User) can involve the whole body. The entire process will be controlled by brain, as a result during this practice the whole body will receive relaxation/refreshment, and the exhaustion, boring and tiredness will be finished. This physiological biofeedback manner provides groceries for spirit. Hence this means can be used in hospitals for mentally disturb and depression effected patients, for relaxation of the soldiers, for refreshing the students, to cool down workers in industries and for the entertainment of passengers in buses and airplanes. This approach replaces negative thoughts with positive and truthful thoughts.

关键词： Human factors Process control Biological control systems Hospitals Airplanes

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Electric circuits exercise and learning assessment system using databases

Electric circuits exercise and learning assessment system us...

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作者： Komori, G. Aikawa, N. Nishida, Y. Faculty of Industrial Science and Technology Tokyo University of Science Yamasaki2641 Noda Chiba Japan Electrical Electronics and Computer Engineering Chiba Institute of Technology Tsudanuma2-17-1 Narashino-city Chiba Japan

ISBN: (纸本)9788390474342

In this paper, we describe an electric circuits exercise and test system with the learning assessment that facilitate the assessment task of lecturers. We advance the development of the educational support teaching material enhanced more by adding "Exercise" and "Test" insufficient in the previous iCASS (Interactive Circuits And System Seminar). In "Exercise", students learn electric circuit through web-browser embedding Java-applet. Learning results in exercise is appreciable from various aspects. In "Test", students take test of electric circuits and the result of test is summarized in the table and graph automatically by database. Lecturer can grade each students based on it. Copyright © 2010 by Institute of electronics, Silesian University of technology.

关键词： Students

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Quantum-mechanical modeling of phonon-limited electron mobility in bulk MOSFETs, ultrathin-body SOI MOSFETs and double-gate MOSFETs for different orientations

Quantum-mechanical modeling of phonon-limited electron mobil...

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33rd International Convention on Information and Communication technology, electronics and Microelectronics, MIPRO 2010

作者： Poljak, M. Jovanović, V. Suligoj, T. Department of Electronics Microelectronics Computer and Intelligent Systems Faculty of Electrical Engineering and Computing University of Zagreb Unska 3 HR-10000 Zagreb Croatia ECTM-DIMES Delft University of Technology Feldmannwed 17 2628 CT Delft Netherlands

ISBN: (纸本)9789532330502

A comprehensive study of low-field phonon-limited mobility behavior with downscaling of silicon body thickness in ultrathin-body SOI MOSFETs and double-gate MOSFETs is presented. Phonon-limited mobility is obtained by self-consistent Schrödinger-Poisson simulations and momentum relaxation rate calculations. Single- and double-gate devices with (100), (110) and (111) active surfaces and body thickness down to 2 nm are investigated. Physical mechanisms which govern mobility behavior are studied by calculating form factors and ladder/subband occupancy.

关键词： Quantum theory

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