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Brazilian Power electronics Conference, COBEP

作者： Andressa C. Schittler Douglas Pappis Cassiano Rech Alexandre Campos Marco A. Dalla Costa Electrical Engineering Post-Graduation Program-PPGEE Electronic Ballast Research Group-GEDRE Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil Electrical Engineering Post-Graduation Program-PPGEE Power Electronics and Control Group-GEPOC Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil

This paper presents a complete AC small-signal general model for the interleaved buck converter (IBC) operating in continuous conduction mode. Average state-space technique is used and the most important parasitic elements are included. A ready-to-use generalized model for n-cells structure is developed by obtaining its DC model and AC small-signal model for a certain operation point. Besides, it is presented an n-cells inductor value analysis against duty-cycle and a second-order model is derived from that, which can replace the complete model with accuracy, simplifying the dynamics analysis. Models have been successfully verified experimentally, and compared via simulation in Matlab/Simulink.

关键词： Inductors Mathematical model Switches Integrated circuit modeling Logic gates Inductance Analytical models

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Optical Transmittance for Analysis of the Dynamics of Self-Assembled Rotating Chains of Superparamagnetic Micro- and Nano Beads in Solution

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Journal of Physics: Conference Series 2012年第1期352卷

作者： Pil Ju Ko Tsukasa Takamura Adarsh Sandhu Department of Electrical and Electronic Engineering Tokyo Institute of Technology 2-12-1 O-okayama Meguro-ku Tokyo 152-8552 Japan Tokyo Tech Global COE Program on Evolving Education and Research Center for Spatio-Temporal Biological Network Tokyo 152-8552 Japan Electronics-Inspired Interdisciplinary Research Institute (EIIRIS) Toyohashi University of Technology Hibarigaoka Tempaku-cho Toyohashi 441-8580 Japan

Optically monitoring biosensing procedures based on the dynamics of an aqueous solution containing functionalized superparamagnetic beads in the application of the external rotating magnetic field has been developed for a rapid, highly sensitive, and inexpensive bioassay. Typically, the dynamics of micrometer diameter beads is observed by conventional optical microscopes. For greater affinity to biomolecules, there is a demand which necessitates the use of nanometer sized superparamagnetic beads, comparable size to actual biomolecules. However, a limited amount of work for monitoring the dynamics of nanometer sized beads has been performed thus far due to the maximum resolution of microscopes. Here, we propose a novel protocol enabling us monitor the dynamics of nanometer-diameter beads via change in the optical transmittance.

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Complex-valued functional link network design by orthogonal least squares method for function approximation problems

Complex-valued functional link network design by orthogonal ...

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International Joint Conference on Neural Networks (IJCNN)

作者： Md. Faijul Amin Ramasamy Savitha Muhammad Ilias Amin Kazuyuki Murase Department of Systems Design Engineering Graduate School of Engineering University of Fukui Fukui Japan School of Electrical and Electronics Engineering Nanyang Technological University Singapore Department of Computer Science and Engineering United International University Dhaka Bangladesh Research and Education Program for Life Science University of Fukui Fukui Japan

This paper presents a fully complex-valued functional link network (CFLN). The CFLN is a single-layered neural network, which introduces nonlinearity in the input layer using nonlinear functions of the original input variables. In this study, we consider multivariate polynomials as the nonlinear functions. Unlike multilayer neural networks, the CFLN is free from local minima problem, and it offers very fast learning in parameters because of its linear structure. In the complex domain, polynomial based CFLN has an additional advantage of not requiring activation functions, which is a major concern in the complex-valued neural networks. However, it is important to select a smaller subset of polynomial terms (monomials) for faster and better performance, since the number of all possible monomials may be quite large. In this paper, we use the orthogonal least squares method in a constructive fashion (starting from lower degree to higher) for the selection of a parsimonious subset of monomials. Simulation results demonstrate that computing CFLN in purely complex domain is advantageous than in double-dimensional real domain, in terms of number of connection parameters, faster design, and possibly generalization performance. Moreover, our proposed CFLN compares favorably with several other multilayer networks in the complex domain.

关键词： Polynomials Nonhomogeneous media Educational institutions Algorithm design and analysis Function approximation Neural networks Input variables

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Remote monitoring of the load characteristics of synchronous generators

Remote monitoring of the load characteristics of synchronous...

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International Conference on Power engineering, Energy and electrical Drives, POWERENG

作者： Ilhami Colak Ilhan Garip Seref Sagiroglu Sertac Bayhan Gazi Electrical Machines and Energy Control Group Technology Faculty Department of Electrical and Electronics Engineering Gazi University Ankara Turkey Gazi Electrical Machines and Energy Control Group Department of Strategy Development TRT Broadcasting Company Ankara Turkey Gazi Electrical Machines and Energy Control Group Engineering Faculty Department of Computer Engineering Gazi University Ankara Turkey Gazi Electrical Machines and Energy Control Group Ataturk Higher Vocational School Program of Electric Gazi University Ankara Turkey

In this study a data acquisition card has been designed and implemented to observe and analysis of the voltages and the currents of an alternator under resistive, capacitive and inductive loads. Detail analysis of power, power factor, phase angles and harmonics of the alternator has been done using software written in LabVIEW. The measurement system of voltage and current is opened to remote access. Users can access to the system from any computer having internet connection and make the instantaneous measurements. The experimental results show that the data obtained from power analyzer are very close to remote monitored one. Therefore the system developed can be a useful tool for engineering education purposes as an online course material, a simulator and an online control experiment.

关键词： Alternators Loading Harmonic analysis Monitoring Current measurement Power system harmonics Voltage measurement

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An electronically controlled current-mode triangular/square wave generator employing MO-CCCCTAs

An electronically controlled current-mode triangular/square ...

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International Conference on electrical engineering/electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： T. Srisakul P. Silapan M. Siripruchyanun Department of Electronics Phitsanulok Technical College Phitsanulok Thailand Electrical and Industrial Program Faculty of Industrial Uttaradit Rajabhat University Uttaradit Thailand Department of Teacher Training in Electrical Engineering Faculty of Technical Education King Mongkut''s University of Technology North Bangkok Bangkok Thailand

A new current-mode triangular/square wave generator based on MO-CCCCTAs (Multiple output current controlled current conveyor transconductance amplifiers) is presented in this paper. The circuit description is very simple, its construction consists of 2 MO-CCCCTAs and 1 grounded capacitor without any external resistor. The output frequency and amplitude can be electronically/independently tuned via corresponding input bias currents. With mentioned features, it is very suitable to realize in a monolithic chip. The PSpice simulation results are depicted, and agree well with the theoretical anticipation. The maximum power consumption is approximately 1.62mW at±1.5V power supply.

关键词： Topology Equations Computers Mathematical model SPICE

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Microfluidic flow cytometer utilizing optical space-time coding technique

Microfluidic flow cytometer utilizing optical space-time cod...

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IEEE Photonics Conference (IPC)

作者： Tsung-Feng Wu Zhe Mei Luca Pion-Tonachini Yu-Hwa Lo Materials Science and Engineering Program University of California at San Diego La Jolla CA USA School of Information and Electronics Beijing Institute of Technology Beijing China Department of Electrical and Computer Engineering University of California at San Diego La Jolla CA USA

An optical-coding technique for microfluidic flow cytometers to detect forward scattering and large angle scattering signals that can be used to differentiate beads and cells.

关键词： Optical scattering Microfluidics Optical sensors Optical signal processing Optical device fabrication Biomedical optical imaging

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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 parallel architecture for ray-tracing with an embedded intersection algorithm

A parallel architecture for ray-tracing with an embedded int...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Alexandre S. Nery Nadia Nedjah Felipe M.G. França Lech Jozwiak LAM-Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electrical Engineering-Electronic Systems Eindhovan University of Technology Netherlands Department of Electronics Engineering and Telecommunications-Faculty of Engineering Universidade do Estado do Rio de Janeiro (UERJ) Brazil

Real time rendering of three-dimensional scenes in Ray Tracing is a hard problem. However, parallel implementations have been enabling real time performance, as the algorithm can be highly parallelized. Thus, a custom parallel design in hardware is likely to achieve a good performance. In this paper, we further improve the GridRT architecture overall performance by embedding the ray-triangle intersection computation into the precessing elements that form the architecture. Low cost and high rendering performance are the main concerns in this novel design. The results show that the execution time of each intersection computation is reduced by at least 50%, while the area cost is practically unchanged or even reduced when compared to the original GridRT implementation.

关键词： Ray tracing Registers Equations USA Councils Mathematical model Parallel architectures

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Hardware Reuse in Modern Application-Specific Processors and Accelerators

Hardware Reuse in Modern Application-Specific Processors and...

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Euromicro Symposium on Digital System Design

作者： Alexandre S. Nery Lech Jozwiak Menno Lindwer Mauro Cocco Nadia Nedjah Felipe M.G. Franca LAM-Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electrical Engineering-Electronic Systems Eindhoven University of Technology Netherlands Silicon Hive-Intel UMG Netherlands Department of Electronics Engineering and Telecommunications-Faculty of Engineering Universidade do Estado do Rio de Janeiro Brazil

Effective exploitation of the application-specific parallel patterns and computation operations through their direct implementation in hardware is the base for construction of high-quality application-specific (re-)configurable application specific instruction set processors (ASIPs) and hardware accelerators for modern highly-demanding applications. Although it receives a lot of attention from the researchers and practitioners, a very important problem of hardware reuse in ASIP and accelerator synthesis is clearly underestimated and does not get enough attention in the published research. This paper is an effect of an industry and academic collaborative research. It analyses the problem of hardware sharing, shows its high practical relevance, as well as a big influence of hardware sharing on the major circuit and system parameters, and its importance for the multi-objective optimization and tradeoff exploitation. It also demonstrates that the state-of-the-art synthesis tools do not sufficiently address this problem and gives several guidelines related to enhancement of the hardware reuse.

关键词： Hardware Resource management Computer architecture Optimization program processors Adders Delay

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Characteristics of Step-Graded In_xGa_(1-x)As and InGaP_ySb_(1-y) Metamorphic Buffer Layers on GaAs Substrates

Characteristics of Step-Graded In_xGa_(1-x)As and InGaP_ySb_...

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Compound Semiconductor Week

作者： J. Kirch P. Dudley T. Kim K. Radavich S. Ruder L. J. Mawst T. F. Kuech S. D. LaLumondiere Y. Sin W. T. Lotshaw S. C. Moss Department of Electrical and Computer Engineering University of Wisconsin - Madison Materials Science Program University of Wisconsin - Madison Department of Chemical and Biological Engineering University of Wisconsin - Madison Electronics and Photonics Lab The Aerospace Corporation

ISBN: (纸本)9781457717536

Step-graded InGaP_ySb_(1-y) and In_xGa_(1-x)As metamorphic buffer layer (MBL) structures are grown on GaAs substrates by metal-organic chemical vapor deposition (MOCVD). AFM analysis indicates that graded group V InGaP_ySb_(1-y) MBLs exhibit significantly lower surface roughness (～4.7nm) compared with more conventional graded group III In_xGa_(1-x)As MBLs, which typically have rms surface roughness in the range of 7-14nm. To reduce the surface roughness of the In_xGa_(1-x)As MBL, a post growth Chemical-Mechanical Polishing (CMP) procedure is implemented. AFM image analysis indicates the CMP process is effective in reducing the step-graded In_xGa_(1-x)As MBL surface roughness from ～7.3 nm (as-grown) to 2.3 nm post CMP. Preliminary studies indicate that bulk InGaAs layers regrown on top of the MBL subjected to CMP exhibit improved static and transient PL characteristics compared with those deposited on as-grown MBLs.

关键词： III-V semiconductors Defects Optical devices

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