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An input current shaper using a class-DE rectifier to meet IEC 61000-3-2 class-C standard processing a small part of the total power

An input current shaper using a class-DE rectifier to meet I...

引用

2012 9th International Conference on Electrical engineering/electronics, Computer, telecommunications and Information Technology, ECTI-CON 2012

作者： Ekkaravarodome, Chainarin Buree, Netiwut Jirasereeamornkul, Kamon Department of Instrumentation and Electronics Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Program Faculty of Science and Technology Rajabhat Maha Sarakham University Maha Sarakham Thailand Department of Electronic and Telecommunication Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

ISBN: (纸本)9781467320245

This paper proposed an electronic ballast that uses an input current shaper to reduce the total harmonic distortion of the line input current, that only process a small part of the total power. Base on the minimum value of the conduction angle to satisfy the requirements of the IEC 61000-3-2 Class-C standard, the conduction loss of the ICS stage can be reduced. The input current shaper is achieved by using a bridge rectifier which acts as the Class-DE resonant rectifier. By using this topology the conduction angle of the diode can be increased to high enough for satisfy the IEC 61000-3-2 Class-C standard requirements. The proposed electronic ballast is designed for 36-W fluorescent lamp and operated at a line rms voltage of 220 V, a line frequency of 50 Hz with the switching frequency fixed at about 76 kHz. The experimental results show that the total harmonic distortion is 29.5%, the power factor is 0.96, a lamp-current crest factor is 1.42, and 95.2% efficiency at full power. © 2012 IEEE.

关键词： Fluorescent lamps

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Electronically tunable four phase quadrature oscillator employing current-controlled current conveyor transconductance amplifiers

Electronically tunable four phase quadrature oscillator empl...

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2011 6th IEEE International Symposium on Electronic Design, Test and Application, DELTA 2011

作者： Tanaphatsiri, Chaiya Jaikla, Winai Program in Electronics and Telecommunication Engineering Faculty of Industrial Education and Technology RMUTSV Songkhla 90000 Thailand Department of Electronic Technology Faculty of Industrial Technology Suan Sunandha Rajabhat University Dusit Bangkok 10300 Thailand

ISBN: (纸本)9780769543062

A current-mode four-phase quadrature oscillator using 2 current controlled current conveyor transconductance amplifiers (CCCCTAs) and 2 grounded capacitors is presented. The proposed oscillator can provide 4 sinusoidal output currents with 90° phase difference. The oscillation condition and oscillation frequency can be electronically/independently controlled by adjusting the bias current of the CCCCTA. High output impedances of the configuration enable the circuit to be cascaded without additional current buffers. The use of only grounded capacitors is ideal for integration. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation. © 2011 IEEE.

关键词： Conveyors

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Multi-band printed antennas impedance characterization using a FDTD/WP-PML based methodology

Multi-band printed antennas impedance characterization using...

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SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： Glaucio Lopes Ramos Cássio Gonçalves do Rego Graduate Program in Electrical Engineering Department of Telecommunication and Mechatronics Engineering Federal University of Minas Gerais Federal University of São João del-Rei Ouro Branco Minas Gerais Brazil Department of Electronics Engineering Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil

This paper presents the results of the application of a FDTD technique to determinate the return loss parameter of two printed multi-band antennas. The impedance characterization of wide-band printed antennas with lossy substrates is introduced by means of an approach based on FDTD method and the WP-PML absorbing boundary condition. It was used a simple voltage source model where an excitation plane with an Gaussian vertical electrical field was imposed to a rectangular area just below the structure to be analyzed. Preliminary results obtained for the return loss of MIMO multi-band antennas are compared to those determined from other FDTD-based methods available in the scientific literature in order to show the applicability of the methodology that has been developed herein. The results obtained for return loss parameter showed good agreements between the technique proposed by this work and the results previous done.

关键词： Antennas Time domain analysis Finite difference methods Antenna measurements Geometry Boundary conditions

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A hybrid rough set - Particle swarm algorithm for image pixel classification

A hybrid rough set - Particle swarm algorithm for image pixe...

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6th International Conference on Hybrid Intelligent Systems and 4th Conference on Neuro-Computing and Evolving Intelligence, HIS-NCEI 2006

作者： Das, Swagatam Abraham, Ajith Sarkar, Subir Kumar Department of Electronics and Telecommunication Engineering Jadavpur University Kolkata 700032 India IITA Professorship Program School of Computer Science Yonsei University Seoul Korea Republic of

ISBN: (纸本)0769526624

This article presents a framework to hybridize the rough set theory with a famous swarm intelligence algorithm known as Particle Swarm Optimization (PSO). The hybrid rough-PSO technique has been used for grouping the pixels of an image in its intensity space. Medical and remote sensing satellite images become corrupted with noise very often. Fast and efficient segmentation of such noisy images (which is essential for their further interpretation in many cases) has remained a challenging problem for years. In this work, we treat image segmentation as a clustering problem. Each cluster is modeled with a rough set. PSO is employed to tune the threshold and relative importance of upper and lower approximations of the rough sets. Davies-Bouldin clustering validity index is used as the fitness function, which is minimized while arriving at an optimal partitioning. © 2006 IEEE.

关键词： Image segmentation

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Document Clustering Using Differential Evolution

Document Clustering Using Differential Evolution

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Congress on Evolutionary Computation

作者： A. Abraham S. Das A. Konar IITA Professorship Program School of Computer Science and Engineering Chung Ang University Seoul South Korea Department of Electronics and Telecommunication Engineering Jadavpur University Kolkata India

This paper investigates a novel approach for partitional clustering of a large collection of text documents by using an improved version of the classical differential algorithm (DE). Fast and accurate clustering of documents plays an important role in the field of text mining and automatic information retrieval systems. The k-means has served as the most widely used partitional clustering algorithm for text documents. However, in most cases it provides only locally optimal solutions. In this work, the clustering problem has been formulated as an optimization task and is solved using a modified DE algorithm. To reduce the computational time, a hybrid k-means with DE method has also been proposed. The new algorithms were tested on a number of document datasets. Comparison with k-means, a state of the art PSO and one recently proposed real coded GA based text clustering methods reflects the superiority of the proposed techniques in terms of speed and quality of clustering.

关键词： Clustering algorithms Partitioning algorithms Information retrieval Tree graphs Genetic algorithms Particle swarm optimization Computer science Text mining Testing Clustering methods

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A Hybrid Rough Set--Particle Swarm Algorithm for Image Pixel Classification

A Hybrid Rough Set--Particle Swarm Algorithm for Image Pixel...

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International Conference on Hybrid Intelligent Systems (HIS)

作者： Swagatam Das Ajith Abraham Subir Kumar Sarkar Department of Electronics and Telecommunication Engineering Jadavpur University Kolkata India School of Computer Science IITA Professorship Program Yonsei University Seoul South Korea

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The Effects of Varying Tilt Angle of Halo Implant on the Performance of Sub 100nm LAC MOSFETs

The Effects of Varying Tilt Angle of Halo Implant on the Per...

引用

International Conference on Industrial and Information Systems, ICIIS

作者： Partha Sarkar Abhijit Mallik Chandan Kumar Sarkar V. Ramgopal Rao Department of Electronics & Telecommunication Engineering Jadavpur University Kolkata India Q.I.P. program of AICTE Orissa Engineering College Bhubaneswar Orissa India Department of Electronics & Communication Engineering Kalyani Government Engineering College India Department of Electrical Engineering Indian Institute of Technology Bombay India

In this paper we systematically investigate the effects of the varying tilt angle of the halo implants on the different device performance parameters of 100 nm lateral asymmetric channel (LAC) MOSFETs. The tilt angle is varied from 5deg to 60deg with twist angle 0deg. Substantial reduction of sub-threshold swing is found for large tilt angles as compared to low angles of halo implant. The device structure, known as lateral asymmetric channel with large angle tilt implant (LACLATI), exhibits better reverse short channel effect and I on /I off , and lower junction capacitance

关键词： Implants Los Angeles Council MOSFETs Threshold voltage Industrial electronics Educational institutions Capacitance Communication industry electronics industry Information systems

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NEC simulation of a bidirectional antenna using a probe excited elliptical ring

NEC simulation of a bidirectional antenna using a probe exci...

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2005 Fifth International Conference on Information, Communications and Signal Processing

作者： Chawanonphithak, Krittaya Phongcharoenpanich, Chuwong Krairiksh, Monai Program of Electronics and Telecommunication Technology Nakhon Ratchasima Rajabhat University Nakhon Ratchasima Thailand Faculty of Engineering Research Center for Communications and Information Technology King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

ISBN: (纸本)0780392833

This paper describes the characteristics of a bidirectional antenna using a probe excited elliptical ring. Based on the waveguide principle, a design of elliptical ring cross section that yields the propagation in dominant mode can be chosen and clarified by Numerical Electromagnetic Code (NEC). The quarter wavelength probe can accomplish matching condition. Subsequently, a decision of the ring length that obtains the desired directivity as well as the efficient radiation pattern, standing wave ratio (SWR), polarization, and bandwidth can be found by simulation. To investigate the characteristics of the proposed antenna for applying at the base stations, the wired grid model must be constructed. Using NEC simulation, the antenna characteristics can be carried out. The antenna prototype is fabricated and tested to verify the validity of our design method and the usefulness in Thai Mobile system operated at the center frequency of 1.92 GHz, The proposed antenna radiating bidirectional beam is suitable for narrow and long path service area with simple configuration and cost effective. © 2005 IEEE.

关键词： Antennas

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Progressive multigrid V-cycle phase unwrapping for MRI phase images

Progressive multigrid V-cycle phase unwrapping for MRI phase...

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International Conference on e-health Networking, Applications and Services (HealthCom)

作者： D.E.O. Dewi A.B. Suksmono T.L.R. Mengko Department of Electrical Engineering Biomedical Engineering Program Bandung Indonesia Department of Electrical Engineering Radio Telecommunication & Microwave Laboratory Bandung Indonesia Department of Electrical Engineering Electronics & Component Laboratory Bandung Indonesia

We propose a progressive method which improves the conventional multigrid V-cycle phase unwrapping (PU) scheme. The method is aimed to accommodate the need of early visualization in solving wrapping problem in phase image. In essence, this technique formulates the wrapped phase image in a partial differential equation (PDE) and solves it by performing a rough global scale solution in the first grid of multigrid structure and constructing the subsequent levels of detail utilizing the gradients of residual error in coarse and fine grids. The intermediate solution is then superposed to the previous solutions and displayed to the user gradually to get an improved solution. In this paper, we look into the feasibility of utilizing this approach to magnetic resonance imaging (MRI) application. The proposed system is evaluated on simulated as well as actual MRI phase images and shows promising progressive improvement in estimating the unwrapped phase image over the conventional one.

关键词： Magnetic resonance imaging Laboratories Visualization Phase estimation Magnetic field measurement Microwave imaging Image processing Wrapping Partial differential equations Demodulation

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Progressive multigrid V-cycle phase unwrapping for MRI phase images

Progressive multigrid V-cycle phase unwrapping for MRI phase...

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7th International Workshop on Enterprise Networking and Computing in Healthcare Industry, HEALTHCOM 2005

作者： Dewi, Dyah Ekashanti O. Suksmono, Andriyan B. Mengko, Tati Latifah R. Department of Electrical Engineering Imaging and Image Processing Research Group Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia Biomedical Engineering Program Department of Electrical Engineering Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia Department of Electrical Engineering Radio Telecommunication and Microwave Laboratory Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia Department of Electrical Engineering Electronics and Component Laboratory Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia

ISBN: (纸本)0780389409

We propose a progressive method which improves the conventional Multigrid V-Cycle Phase Unwrapping (PU) scheme. The method is aimed to accommodate the need of early visualization in solving wrapping problem in phase image. In essence, this technique formulates the wrapped phase image in a Partial Differential Equation (PDE) and solves it by performing a rough global scale solution in the first grid of Multigrid structure and constructing the subsequent levels of detail utilizing the gradients of residual error in coarse and fine grids. The intermediate solution is then superposed to the previous solutions and displayed to the user gradually to get an improved solution. In this paper, we look into the feasibility of utilizing this approach to Magnetic Resonance Imaging (MRI) application. The proposed system is evaluated on simulated as well as actual MRI phase images and shows promising progressive improvement in estimating the unwrapped phase image over the conventional one. © 2005 IEEE.

关键词： Magnetic resonance imaging

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