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检索条件"机构=Electrical Engineering PhD Program of the Faculty of Engineering"

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Compact circularly-polarized microstrip array antenna

Compact circularly-polarized microstrip array antenna

引用

Antennas and Propagation Conference, LAPC, Loughborough

作者： Ahmed H. Abdelrahman Fatma Elhefnawi Atef Z. Elsherbeni Moataza Hendi Salwa Elramly Communication Team Egyptian Space Program National Authority슠for슠Remote Sensing and Space Sciences Cairo Egypt Microwave Department Electronic Research Institute Giza Egypt Center of Applied Electromagnetic System Research (CAESR) Department of Electrical Engineering University of Mississippi USA Electronics& Communications Engineering Department Faculty of Engineering Ain Shams University Cairo Egypt

This paper presents a compact circularly-polarized microstrip array antenna with four square patches fed in phase quadrature such that a phase shift of 90° between each neighbouring patches, thus providing circularly polarized pattern. The feeding network is placed on the opposite side of the patches' ground plane and is designed using three Wilkinson power dividers having different output lengths that achieve the required phase shift between patches.

关键词： Arrays Feeds Microstrip antenna arrays Microstrip antennas Microstrip Substrates

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High-input Impedance Voltage-mode Universal Filter Using CCCCTAs

High-input Impedance Voltage-mode Universal Filter Using CCC...

引用

Electronics, Computer, Telecommunications and Information Technology International Conference on electrical engineering/Electronics, Computer, Telecommunications and Information Technology

作者： Winai Jaikla Abhirup Lahiri Adisorn Kwawsibsame Montree Siripruchyanun Electric and Electronic Program Faculty of Industrial Technology Suan Sunandha Rajabhat University Dusit Bangkok THAILAND Part of the work done while the author was with Division of Electronics and Communications Netaji Subhas Institute of Tec hnology Electronics Department Lanna Polytechnical College Chiangmai Department of Teacher Training in Electrical Engineering Faculty of Technical Education King Mongkut's University of Technology North Bangkok

ISBN: (纸本)9781424456062

This article presents a voltage-mode universal biquadratic filter (low-pass, high-pass, band-pass functions), based on current controlled current conveyor transconductance amplifiers (CCCCTAs). The features of the circuit are that: the quality factor and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely 3 CCCCTAs and 2 grounded capacitors. Without any external resistors, requiring no component matching conditions, and using only grounded elements, the proposed circuit is very appropriate to further develop into an integrated circuit. Moreover, the proposed circuit enables easy cascading in voltage-mode, due to high-input impedances. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. The power consumption is approximately 4.08mW at ±2.5V power supply voltages.

关键词： Impedance Band pass filters Tuned circuits Low pass filters Voltage control Transconductance Q factor Frequency Capacitors Resistors

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Evolving granular classification neural networks

Evolving granular classification neural networks

引用

2009 International Joint Conference on Neural Networks, IJCNN 2009

作者： Leite, Daniel F. Costa Jr., Pyramo Gomide, Fernando Faculty of Electrical and Computer Engineering University of Campinas Brazil Graduate Program in Electrical Engineering Catholic University of Minas Gerais Brazil

ISBN: (纸本)9781424435531

The objective of this study is to introduce the concept of evolving granular neural networks (eGNN) and to develop a framework of information granulation and its role in the online design of neural networks. The suggested eGNN are neural models supported by granule-based learning algorithms whose aim is to tackle classification problems in continuously changing environments. eGNN are constructed from streams of data using fast incremental learning algorithms. eGNN models require a relatively small amount of memory to perform classification tasks. Basically, they try to find information occurring in the incoming data using the concept of granules and T-S neurons as basic processing elements. The main characteristics of eGNN models are continuous learning, self-organization, and adaptation to unknown environments. Association rules and parameters can be easily extracted from its structure at any step during the evolving process. The rule base gives a granular description of the behavior of the system in the input space together with the associated classes. To illustrate the effectiveness of the approach, the paper considers the Iris and Wine benchmark problems. © 2009 IEEE.

关键词： Learning algorithms

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Photovoltaic device based on Poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1,4- phenylene vinylene) polymer

Photovoltaic device based on Poly(2-methoxy-5-(2'-ethyl-hexy...

引用

38th ASES National Solar Conference 2009, SOLAR 2009

作者： Pinto, Leon Rohan Petrovic, Jovana Matavulj, Petar Chambers, David Keith Khatkhatay, Fauzia Selmic, Sandra Zivanovic Electrical Engineering Program Institute for Micromanufacturing Louisiana Tech University Ruston LA 71272 United States Faculty of Electrical Engineering University of Belgrade 11000 Belgrade Serbia

ISBN: (纸本)9781615673636

Semiconductive polymers have been commercialized due to their ability of competing with inorganic based materials. Some conjugated polymers can absorb light in the UV-visible region, which makes them potential candidates for photovoltaics. Understanding of the charge carrier generation, transport, and recombination processes is particularly important. One widely investigated material for solar cell, photodiode, and light-emitting device applications is a soluble conjugated polymer, poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene), or MEH-PPV. In this paper we present experimental results on MEH-PPV polymer and ITO/PEDOT:PSS/MEH-PPV/Al photovoltaic device, where ITO and PEDOT:PSS stand for indium tin oxide and poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate), respectively. The experimental results include optical absorbance of MEH-PPV with determination of the optical absorption coefficient, photocurrent dependence on incident optical power, incident light wavelength, bias voltage, and polymer thin film thickness. Theoretical modeling is based on drift-diffusion and continuity equations for hole polarons, as well as the assumption that the charge carrier recombination process is bimolecular. The bimolecular recombination mechanism implies that the photocurrent depends on the square root of the optical power, which agrees with our experimental results. Copyright © (2009) by the American Solar Energy Society.

关键词： Conjugated polymers

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Meet the ABET "student work sample" requirements: Document student learning

Meet the ABET "student work sample" requirements: Document s...

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2009 ASEE Annual Conference and Exposition

作者： Christe, Barbara Cooney, Elaine Baccalaureate Program in Biomedical Engineering Technology Indiana University Indianapolis United States University College faculty United States Department of Electrical and Computer Engineering Technology IUPUI

Assessment theory has expanded from traditional examinations that are focused on the result, to include the process of learning. ABET program evaluators (PEVs) have been instructed to look for documentation of student learning in the samples of student work required of institutions seeking accreditation. Educational theory supports this change as a positive shift to promote student success. This paper will explore the techniques which institutions can use to successfully exemplify the achievements and transformation of their students, which will meet the expectations of ABET evaluators. The benefits of this new approach, for faculty, students and the program will be highlighted. © American Society for engineering Education, 2009.

关键词： Students

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A digitally programmable voltage-mode multifunction filter using CCDVCCs

A digitally programmable voltage-mode multifunction filter u...

引用

2009 9th International Symposium on Communications and Information Technology, ISCIT 2009

作者： Chanapromma, Chaiyan Jaikla, Winai Siripruchyanun, Montree Computer Engineering Program Faculty of Industrial Technology Uttaradit Rajabhat University Muang Uttaradit 53000 Thailand Electric and Electronic Program Faculty of Industrial Technology Suan Sunandha Rajabhat University Dusit Bangkok 10300 Thailand Department of Teacher Training in Electrical Engineering Faculty of Technical Education King Mongkut's University of Technology North Bangkok Bangkok 10800 Thailand

ISBN: (纸本)9781424445219

This article presents a voltage-mode multi-function filter performing completely standard functions: low-pass, high-pass, band-pass, band-reject and all-pass functions, current controlled differential voltage current conveyors (CCDVCCs). The features of the circuit are that: the quality factor and pole frequency can be tuned independently via the input bias currents: the circuit description is very simple, consisting of merely 2 CCDVCCs, 1 resistor and 2 capacitors. Only one external resistor and without any component matching conditions, the proposed circuit is very appropriate to further develop into an integrated circuit. Additionally, each function response can be selected by suitably selecting input signals with digital method. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. ©2009 IEEE.

关键词： Resistors

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Interval-based evolving modeling

Interval-based evolving modeling

引用

IEEE Workshop on Evolving and Self-Developing Intelligent Systems, ESDIS

作者： Daniel F. Leite Pyramo Costa Fernando Gomide Faculty of Electrical and Computer Engineering State University of Campinas-UNICAMP Brazil Graduate Program in Electrical Engineering Catholic University of Minas Gerais Brazil

This paper introduces a granular, interval-based evolving modeling (IBeM) approach to develop system models from a stream of data. IBeM is an evolving rule-based modeling scheme that gradually adapts its structure (information granules and rule base) and rules antecedent and consequent parameters from data (inductive learning). Its main purpose is continuous learning, self-organization, and adaptation to unknown environments. The IBeM approach develops global model of a system using a fast, one-pass learning algorithm, and modest memory requirements. To illustrate the effectiveness of the approach, the paper considers actual time series forecasting applications concerning electricity load and stream flow forecasting.

关键词： Predictive models Load forecasting Mathematical model Power system modeling Chaos Neural networks Demand forecasting Data engineering Data analysis Frequency domain analysis

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Evolving granular classification neural networks

Evolving granular classification neural networks

引用

International Joint Conference on Neural Networks (IJCNN)

关键词： Neural networks Prototypes Neurons Clustering methods Electrochemical machining Computer networks Design engineering Association rules Data mining Iris

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Current controlled current conveyor-based current-mode universal filter

Current controlled current conveyor-based current-mode unive...

引用

2009 9th International Symposium on Communications and Information Technology, ISCIT 2009

作者： Jaikla, Winai Siripruchyanun, Montree Electric and Electronic Program Faculty of Industrial Technology Suan Sunandha Rajabhat University Dusit Bangkok 10300 Thailand Department of Teacher Training in Electrical Engineering Faculty of Technical Education King Mongkut's University of Technology North Bangkok Bangkok 10800 Thailand

ISBN: (纸本)9781424445219

This article presents a current-mode universal biquadratic filter performing completely standard functions: low-pass, high-pass, band-pass, band-reject and all-pass functions, based-on dual-output current controlled current conveyor (DO-CCCII). The features of the circuit are that: the quality factor and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely 4 DO-CCCIIs and 2 grounded capacitors. Without any external resistors and require component matching conditions, the proposed circuit is very suitable to further develop into an integrated circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. The maximum power consumption is approximately 1.16mW at ±1.5V power supply voltages. ©2009 IEEE.

关键词： SPICE

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How we measure success makes a difference: Eight-semester persistence and graduation rates for female and male engineering students

How we measure success makes a difference: Eight-semester pe...

引用

2009 ASEE Annual Conference and Exposition

作者： Ohland, Matthew Camacho, Michelle Layton, Richard Long, Russell Lord, Susan Wasburn, Mara School of Engineering Education Purdue University United States Sociology Department Affiliated Faculty in both Ethnic Studies Program and Gender Studies Program University of San Diego United States Center for Practice and Scholarship of Education Department of Mechanical Engineering Rose-Hulman Institute of Technology United States MIDFIELD United States Department of Electrical Engineering University of San Diego United States Department of Organizational Leadership College of Technology Purdue University United States

Recent research has shown that, although stereotypes prevail about women's attrition rates in undergraduate engineering, there is no gender gap in the persistence of engineering students to the eighth semester of study. How "persistence" is measured, however, is of methodological concern as we look at what constitutes success. "Persistence" is reported in the literature in various ways as approximate measures of graduation, which is the ultimate goal. To examine the relationship between measures of persistence and graduation, analyses were conducted using MIDFIELD (the Multiple-Institution Database for Investigating engineering Longitudinal Development). The database includes student records from 75,686 first-time-in-college students matriculating in engineering at one of nine public universities in the southeastern United States. We found gender and institutional differences in the six-year graduation rates of students who persist to the eighth semester. An important result of this work is demonstrating how studying different outcomes can tell different stories about the same students: studying eight-semester persistence for aggregate populations can provide a reasonable surrogate for graduation, but may paint an overly optimistic picture at some institutions, and the study of both outcomes can provide new and valuable information about the student experience. © American Society for engineering Education, 2009.

关键词： Students

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