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International Conference on Green Circuits and Systems (ICGCS)

作者： P. Siricharoen S. Aramvith T.H. Chalidabhongse S. Siddhichai Department of Electrical Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand Faculty of Information Technology King Mongkut's Institute of Technology Ladkrabang (KMITL) Bangkok Thailand National Electronics and Computer Technology Center Pathum Thani Thailand

The statistical background subtraction and shadow detection algorithm (SBGS) is fast and reliable in outdoor scenes with shadows. However, its reliability depends on the number of training frames to construct the initial background model. In addition, the similarity between foreground and background colors, i.e, camouflage problem, could lead to the worse performance of background subtraction. In this paper, we present a robust outdoor background subtraction technique based on color statistics and edge information. Vector median filtering technique was employed in the initialization of the background model to address the SBGS's limitation. In addition, a combination of color statistics and edge information is utilized to improve the segmentation results over the original algorithm. Test data was compiled from various outdoor conditions including strong shadow, complex background, and low contrast scenes. The background subtraction results show that the proposed approach outperformed other well-known segmentation algorithms such as non-adaptive and adaptive SBGS algorithms as well as mixture of Gaussian algorithm based on precision-recall and computational measurements.

关键词： Robustness Humans Layout Lighting Subtraction techniques Statistics Filtering Surveillance Object segmentation Color

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Model construction and control of trapped vortices

Model construction and control of trapped vortices

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UKACC International Conference on CONTROL 2010

作者： Verheijen, Lennart Tutty, Owen R. Markovsky, Ivan Rogers, Eric Faculty of Electrical Engineering Eindhoven University of Technology 5612AZ Eindhoven. Netherlands School of Engineering Sciences University of Southampton Southampton SO17 1BJ United Kingdom School of Electronics and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom

ISBN: (纸本)9781846000386

The possibility of having thick wings on aircraft has many potential advantages such as fuel storage, but flow past such a structure is very prone to separation with a large increase in drag. Hence for this technology to progress methods of suppressing separation must be developed. A feasible control strategy here is constant suction to suppress the shedding followed by oscillatory suction to maintain the attached flow, but a more efficient strategy with a lower energy consumption is clearly desirable. In particular, simulations of the flow are relatively cheap by numerical fluids standards but still require a significant computational effect, typically one to two days on a 32 processor machine. Hence a necessary step in developing more efficient control is to obtain a low order model that can be used for control design purposes. This paper gives initial results from an extensive research programme which is investigating the use of system identification for this task together with a specifically developed experimental configuration.

关键词： Fuel storage

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Determining Suitability of Locations for Installation of Solar Power Station Based on Probabilistic Inference

Determining Suitability of Locations for Installation of Sol...

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International Conference on Machine Learning and Applications (ICMLA)

作者： Ilhami Colak Seref Sagiroglu Mehmet Demirtas Hamdi Tolga Kahraman Faculty of Technology Department of Electrical and Electronics Engineering Gazi University Ankara Turkey Faculty of Engineering Department of Computer Engineering Gazi University Ankara Turkey Gazi Electrical Machines and Energy Control Group (GEMEC) Faculty of Technology Karadeniz Technical University Trabzon Turkey

This paper presents a novel system is to develop to determine the suitability of a location for installation of solar power stations. Necessary data including speed and direction of wind, solar radiation and rainfall are received from a meteorology station, and data acquired are then converted to the labels. Finally, the labels are evaluated in a Naïve Bayes algorithm to determine the suitability of the location for the installation and axial structure of a Solar Power Plant. This helps to determine complicated calculations by means of the support system developed.

关键词： Power generation Classification algorithms Strontium Solar energy Solar radiation Wind speed Equations

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Speed closed-loop drive system of permanent magnet synchronous motor using low-count QEP

Speed closed-loop drive system of permanent magnet synchrono...

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

作者： Sittichai Munggonrit Mongkol Konghirun Kanokvate Tungpimolrut Faculty of Engineering Department of Electrical Engineering King Mongkut''s University of Technology Thonburi Bangkok Thailand National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand

ISBN: (纸本)9781424456062;9789746724913

A speed closed-loop drive system of permanent magnet synchronous motor (PMSM) typically requires the rotor position feedback from the high-count quadrature encoder pulse (QEP) sensor equipped with the motor. Unlike the brushless dc motor, the high resolution of rotor position is necessary in PMSM drive because the instantaneous rotor position is required for its field orientation on the synchronously rotating dq-axis coordinate. In addition, the bandwidth of the calculated speed depends on the resolution of measured rotor position as well. Unfortunately, the resolution of the QEP (e.g., 1000-2000 pulse/rev) heavily affects the overall cost. In low cost applications, the PMSM drive using the high-count QEP is therefore impossible. This paper proposes the rotor position extrapolation using the polynomial estimator from the low-count QEP and implement in the complete speed closed-loop drive system of PMSM. Simulation results using MATLAB/SIMULINK are presented to initially validate the proposed algorithm in the speed closed-loop drive system. According to these results, the improved speed control in a high speed range can be observed when using low-count QEP of 3 and 6 pulse/rev. However, in the low speed range the speed control still requires the higher count QEP. Finally, the experimental results are included and discussed to fully validate the overall system.

关键词： Permanent magnet motors Rotors Brushless DC motors Costs Velocity control Feedback Magnetic sensors Sensor systems DC motors Synchronous motors

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Implementation of speed controlled Permanent-Magnet Synchronous Motor drive using low-resolution encoder for low-cost applications

Implementation of speed controlled Permanent-Magnet Synchron...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Sittichai Munggonrit Mongkol Konghirun Kanokvate Tungpimolrut Faculty of Engineering Department of Electrical Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand

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 low-cost 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： Rotors Polynomials Extrapolation Torque Stators Mathematical model Load modeling

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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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International Conference on Signals and Electronic Systems, ICSES

作者： G. Komori N. Aikawa Y. Nishida Faculty of Industrial Science and Technology Tokyo University of Science Noda Chiba Japan Electrical Electronics and Computer Engineering Chiba Institute of Technology Narashino Chiba Japan

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.

关键词： Databases Electronic learning Electronic mail Integrated circuit modeling Multimedia communication Electrical engineering

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Development of electric circuit exercise system by e-learning

Development of electric circuit exercise system by e-learnin...

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International Power engineering Conference (IPEC)

In this paper, we describe about the development of electric circuit exercise system that has interactiveness and effect of animation by using GUI operation, to make "Movement" of technological model easily underdtood for the students. Althogh we proposed iCass (Interactive Circuits and System Seminar) as a research similar to this paper, we advance the development of the educational support teaching material enhanced more by adding "Problem exercise" and "Learning assessment" insufficient in it.

关键词： Electronic learning Education computer industry electronics industry Animation Circuits and systems Electrical engineering Space technology Power electronics Graphical user interfaces

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Performance Investigation of a STBC-OFDM System on Frequency-Selective Fading Channels

Performance Investigation of a STBC-OFDM System on Frequency...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Jie Zhou Bo Lv Yun Li Yoshikuni Onozato School of Electronics and Information Engineering Nanjing University of Information Science and Technology Nanjing China Department of Computer Science Faculty of Engineering Gunma University Kiryu Japan

In order to obtain high spectral efficiency and high-rate packet transmission, this paper has proposed a STBC-OFDM system to solve the problem of Multi-fading Channels for wideband wireless communication system. Considering the Frequency Selective Channels (FSC), the paper gives the many simulation results of BER based on SNR when the system adopted different number of receiving and transmitting antennas, and with or without random interleaver. The results show the detail impact of FFT and the number of sub-carriers on the system. The interleaver can improve the performance of system greatly and will get a reasonable robustness in future wireless system.

关键词： OFDM Fading Receiving antennas Transmitting antennas Wireless communication Bit error rate Power capacitors

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An Optimal Implementation on FPGA of a Hopfield Neural Network

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Advances in Artificial Neural Systems 2011年第1期2011卷

作者： W. Mansour R. Ayoubi H. Ziade R. Velazco W. EL Falou TIMA Laboratory 46 avenue Félix Viallet 38031 Grenoble Francetima.imag.fr Department of Computer Engineering University of Balamand Tripoli Lebanonbalamand.edu.lb Electrical and Electronics Department Faculty of Engineering I Lebanese University El Arz Street El Kobbe Tripoli Lebanonul.edu.lb Lebanese French University of Technology and Applied Sciences Tripoli Lebanon

The associative Hopfield memory is a form of recurrent Artificial Neural Network (ANN) that can be used in applications such as pattern recognition, noise removal, information retrieval, and combinatorial optimization problems. This paper presents the implementation of the Hopfield Neural Network (HNN) parallel architecture on a SRAM-based FPGA. The main advantage of the proposed implementation is its high performance and cost effectiveness: it requires O ( 1 ) multiplications and O (log N ) additions, whereas most others require O ( N ) multiplications and O ( N ) additions.

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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： Srikanth Pagadarai Adrian Kliks Hanna Bogucka Alexander M. Wyglinski Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA Faculty of Electronics and Telecommunications Poznan University of Technology Poznan Poland

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.

关键词： OFDM Interference Wireless communication Complexity theory Transceivers Frequency modulation

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