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2001

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Articles 211 - 240 of 340

Full-Text Articles in Electrical and Computer Engineering

Systematic Measurement Of Alxga1−Xn Refractive Indices, Ü. Özgür, Grady Webb-Wood, Henry O. Everitt, Feng Yun, Hadis Morkoç Jan 2001

Systematic Measurement Of Alxga1−Xn Refractive Indices, Ü. Özgür, Grady Webb-Wood, Henry O. Everitt, Feng Yun, Hadis Morkoç

Electrical and Computer Engineering Publications

Dispersion of the ordinary and extraordinary indices of refraction have been measured systematically for wurtzitic AlxGa1−xNepitaxial layers with 0.0⩽x⩽1.0 throughout the visible wavelength region. The dispersion, measured by a prism coupling waveguide technique, is found to be well described by a Sellmeier relation. Discrepancies among previous measurements of refractive indexdispersion, as a consequence of different growth conditions and corresponding band gap bowing parameter, are reconciled when the Sellmeier relation is parameterized not by x but by band gapenergy.

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Photoluminescence Of Gan Grown By Molecular-Beam Epitaxy On A Freestanding Gan Template, Michael A. Reshchikov, D. Huang, F. Yun, L. He, Hadis Morkoç, D. C. Reynolds, S. S. Park, K. Y. Lee Jan 2001

Photoluminescence Of Gan Grown By Molecular-Beam Epitaxy On A Freestanding Gan Template, Michael A. Reshchikov, D. Huang, F. Yun, L. He, Hadis Morkoç, D. C. Reynolds, S. S. Park, K. Y. Lee

Electrical and Computer Engineering Publications

Photoluminescence(PL) studies were performed on a 1.5-μm-thick GaN layer grown by molecular-beam epitaxy on a freestanding GaN template that in turn was grown by hydride vapor-phase epitaxy.PL spectra from both the epilayer and the substrate contain a plethora of sharp peaks related to excitonic transitions. We identified the main peaks in the PL spectrum. Taking advantage of the observation of donor bound exciton peaks and their associated two-electron satellites, we have determined the binding energies of two distinct shallow donors (28.8 and 32.6 meV), which are attributed to Si and O, respectively.

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Dependence Of Gan Polarity On The Parameters Of The Buffer Layer Grown By Molecular Beam Epitaxy, D. Huang, P. Visconti, K. M. Jones, Michael A. Reshchikov, F. Yun, A. A. Baski, T. King, Hadis Morkoç Jan 2001

Dependence Of Gan Polarity On The Parameters Of The Buffer Layer Grown By Molecular Beam Epitaxy, D. Huang, P. Visconti, K. M. Jones, Michael A. Reshchikov, F. Yun, A. A. Baski, T. King, Hadis Morkoç

Electrical and Computer Engineering Publications

The polarity of GaNfilmsgrown using GaN and AlNbuffer layers on sapphire substrates by molecular beam epitaxy were investigated by atomic force microscopy, hot wet chemical etching, and reflection high-energy electron diffraction. We found that the GaNfilmsgrown on high temperature AlN (>890 °C) and GaN (770–900 °C) buffer layers invariably show Ga and N polarity, respectively. However, the filmsgrown using low temperature (∼500 °C) buffer layers, either GaN or AlN, could have either Ga or N polarity, depending on the growth rate of the buffer layer.

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Yellow And Green Luminescence In A Freestanding Gan Template, Michael A. Reshchikov, Hadis Morkoç, S. S. Park, K. Y. Lee Jan 2001

Yellow And Green Luminescence In A Freestanding Gan Template, Michael A. Reshchikov, Hadis Morkoç, S. S. Park, K. Y. Lee

Electrical and Computer Engineering Publications

We have studied a broad photoluminescence band in high-mobility freestanding 200-μm-thick GaN template prepared by hydride vapor-phase epitaxy. Variable-excitation intensity and energy experiments showed two defect-related bands: a yellow luminescence (YL) band at about 2.15 eV and a green luminescence (GL) band at about 2.43 eV. In contrast to epitaxial GaN samples prepared by both vapor-phase and molecular-beam epitaxy, the YL in the sample studied is weak and can be easily saturated. However, the GL is dominant. We attribute the GL to isolated defects involving galliumvacancies and the YL to the same defect, but bound to dislocations, or possibly to …

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Transient Photoluminescence Of Defect Transitions In Freestanding Gan, Michael A. Reshchikov, Hadis Morkoç, S. S. Park, K. Y. Lee Jan 2001

Transient Photoluminescence Of Defect Transitions In Freestanding Gan, Michael A. Reshchikov, Hadis Morkoç, S. S. Park, K. Y. Lee

Electrical and Computer Engineering Publications

Deep level defects responsible for the 2.4 eV photoluminescence (PL) band in a freestanding GaN template were studied by transient photoluminescence. A nonexponential decay of PL intensity observed at low temperature is attributed to a donor–acceptor pair recombination involving a shallow donor and a deep acceptor. At room temperature, a single-exponential PL decay with a lifetime of 30 μs was observed at the high-energy side of the band, whereas the second component with a lifetime of about 750 μs was detected at the low-energy side of the band. The PL decay and transformation of the PL spectrum at room temperature …

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Characterization Of Free-Standing Hydride Vapor Phase Epitaxy Gan, J. Jasinski, W. Sider, Z. Lilental-Weber, P. Visconti, K. M. Jones, Michael A. Reshchikov, F. Yun, Hadis Morkoç, S. S. Park, K. Y. Lee Jan 2001

Characterization Of Free-Standing Hydride Vapor Phase Epitaxy Gan, J. Jasinski, W. Sider, Z. Lilental-Weber, P. Visconti, K. M. Jones, Michael A. Reshchikov, F. Yun, Hadis Morkoç, S. S. Park, K. Y. Lee

Electrical and Computer Engineering Publications

A free-standing GaN template grown by hydride vapor phase epitaxy has been characterized by transmission electron microscopy(TEM). The TEM investigation was augmented by x-ray diffraction, defect delineation etching process followed by imaging with atomic force microscopy and variable temperature photoluminescence. The density of dislocations near the N face was determined to be, in order, 3±1×107, 4±1×107, and about 1×107 cm−2 by cross-sectional TEM, plan-view TEM, and a defect revealing etch, respectively. The same methods on the Ga face revealed the defect concentration to be, in order, less than 1×107 cm−2 by plan-view TEM, less than 5×106 cm−2 by cross-sectional TEM, …

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Deep Centers In A Free-Standing Gan Layer, Z.-Q. Fang, D. C. Look, P. Visconti, D.-F. Wang, C.-Z. Lu, F. Yun, Hadis Morkoç, S. S. Park, K. Y. Lee Jan 2001

Deep Centers In A Free-Standing Gan Layer, Z.-Q. Fang, D. C. Look, P. Visconti, D.-F. Wang, C.-Z. Lu, F. Yun, Hadis Morkoç, S. S. Park, K. Y. Lee

Electrical and Computer Engineering Publications

Schottky barrierdiodes, on both Ga and N faces of a ∼300-μm-thick free-standing GaN layer, grown by hydride vapor phase epitaxy(HVPE) on Al2O3 followed by laser separation, were studied by capacitance–voltage and deep level transient spectroscopy(DLTS) measurements. From a 1/C2 vs V analysis, the barrier heights of Ni/Au Schottky contacts were determined to be different for the two polar faces: 1.27 eV for the Ga face, and 0.75 eV for the N face. In addition to the four common DLTS traps observed previously in other epitaxial GaN including HVPE-grown GaN a new trap B′ with activation energyET=0.53 eV was found in …

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Blue Photoluminescence Activated By Surface States In Gan Grown By Molecular Beam Epitaxy, Michael A. Reshchikov, P. Visconti, Hadis Morkoç Jan 2001

Blue Photoluminescence Activated By Surface States In Gan Grown By Molecular Beam Epitaxy, Michael A. Reshchikov, P. Visconti, Hadis Morkoç

Electrical and Computer Engineering Publications

We have studied the broad blue band, which emerges in the photoluminescence(PL)spectrum of c-plane GaN layers after etching in hot H3PO4 and subsequent exposure to air. This band exhibited a 100 meV blueshift with increasing excitation intensity and a thermal quenching with activation energies of 12 and 100 meV. These observations led us to suggest that surface states may be formed on etchedsurfaces and cause bandbending, which leads to a shift in transition energy with excitation. The blue PL is related to transitions from the shallow donors filled with nonequilibrium electrons to the surface states, which capture the photogenerated …

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A Software Defined Radio Platform With Direct Conversion: Soprano, Shinichiro Haruyama, Robert H. Morelos-Zaragoza Jan 2001

A Software Defined Radio Platform With Direct Conversion: Soprano, Shinichiro Haruyama, Robert H. Morelos-Zaragoza

Faculty Publications

A new software defined radio platform with multiport-based direct conversion is proposed, named SOPRANO (Software Programmable and Hardware Reconfigurable Architecture for Network). The main features of SOPRANO are a high-level design methodology for digital circuits, a new mixer-less direct conversion method, and software algorithms for multi-band and multi-mode operation. We built the first prototype SOPRANO 1.0, which was able to receive PSK and QAM signals with two different carrier frequencies at 2.45 GHz and 5.25 GHz by changing signal processing software.

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Microelectronics Process Engineering: A Non-Traditional Approach To Ms&E (Ingeniería De Procesos Microelectrónicos: Un Acercamiento No Tradicional A La Ciencia De Materiales E Ingeniería), E. Allen, Stacy H. Gleixner, G. Young, David W. Parent, Yasser Dessouky, L. Vanasupa Jan 2001

Microelectronics Process Engineering: A Non-Traditional Approach To Ms&E (Ingeniería De Procesos Microelectrónicos: Un Acercamiento No Tradicional A La Ciencia De Materiales E Ingeniería), E. Allen, Stacy H. Gleixner, G. Young, David W. Parent, Yasser Dessouky, L. Vanasupa

Faculty Publications

Materials Science and Engineering straddles the fence between engineering and science. In order to produce more work-ready undergraduates, we offer a new interdisciplinary program to educate materials engineers with a particular emphasis on microelectronics-related manufacturing. The bachelor's level curriculum in Microelectronics Process Engineering (J1ProE) is interdisciplinary, drawing from materials, chemical, electrical and industrial engineering programs and tied together with courses, internships and projects which integrate thin film processing with manufacturing control methods. Our graduates are prepared for entry level engineering jobs that require knowledge and experience in microelectronics-type fabrication and statistics applications in manufacturing engineering. They also go on to …

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A Wideband Monopole For Reconfigurable Multiband Radio Terminals, Max Ammann Jan 2001

A Wideband Monopole For Reconfigurable Multiband Radio Terminals, Max Ammann

Conference papers

A wideband planar monopole employing two broadbanding techniques is investigated, and is shown to yield an impedance bandwidth ratio of 10:1 or greater for a return loss of 8 dB. The radiation pattern bandwidth is also investigated

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Giant Photoresistivity And Optically Controlled Switching In Self-Assembled Nanowires, N. Kouklin, L. Menon, A. Z. Wong, D. W. Thompson, J. A. Woollam, P. F. Williams, Supriyo Bandyopadhyay Jan 2001

Giant Photoresistivity And Optically Controlled Switching In Self-Assembled Nanowires, N. Kouklin, L. Menon, A. Z. Wong, D. W. Thompson, J. A. Woollam, P. F. Williams, Supriyo Bandyopadhyay

Electrical and Computer Engineering Publications

We report the observation of giant photoresistivity in electrochemically self-assembledCdS and ZnSenanowireselectrodeposited in a porous alumina film. The resistance of these nanowires increases by one to two orders of magnitude when exposed to infrared radiation, possibly because of real-space transfer of electrons from the nanowires into the surrounding alumina by photon absorption. This phenomenon has potential applications in “normally on” infrared photodetectors and optically controlled switches.

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On Interference Cancellation And Iterative Techniques, Ryuji Kohno, Robert H. Morelos-Zaragoza Jan 2001

On Interference Cancellation And Iterative Techniques, Ryuji Kohno, Robert H. Morelos-Zaragoza

Faculty Publications

Recent research activities in the area of mobile radio communications have moved to third generation (3G) cellular systems to achieve higher quality with variable transmission rate of multimedia information. In this paper, an overview is presented of various interference cancellation and iterative detection techniques that are believed to be suitable for 3G wireless communications systems. Key concepts are space-time processing and space-division multiple access (or SDMA) techniques. SDMA techniques are possible with software antennas. Furthermore, to reduce receiver implementation complexity, iterative detection techniques are considered. A particularly attractive method uses tentative hard decisions, made on the received positions with the …

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A Method Of Implementing The Interleaver In 3g Wireless Communication Systems For Randomization Of Burst Errors, Eric Duquette Jan 2001

A Method Of Implementing The Interleaver In 3g Wireless Communication Systems For Randomization Of Burst Errors, Eric Duquette

Inquiry: The University of Arkansas Undergraduate Research Journal

In less than a year or two, third generation ( 3G) wireless communication systems will be replacing the currently existing second generation (2G) wireless systems and be used worldwide. The 3G systems will have a higher data transfer capacity, which allows for simultaneous data, voice, and video transfer (e.g., multimedia applications) while most of 2G systems only allow for low-rate data and voice transfer. The wireless communications industry has set standards for 3G, which detail various operations of the technology. It should be noted that the 3G standards outline only the different operations and not the processes for the production …

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Development Of A Building Electrical Power Systems Design Specialty, Glenn T. Wrate Jan 2001

Development Of A Building Electrical Power Systems Design Specialty, Glenn T. Wrate

Conference Papers in Published Proceedings

Enrollment in Electrical Power Engineering courses has been in a steady decline, and many institutions have dropped power and energy conversion courses. At the same time, the demand for engineers in the field has remained constant, and in some cases has increased significantly. To meet the demand for engineers in the electrical construction sector, the Milwaukee School of Engineering and local industry have worked together to develop a sequence of courses for a Building Electrical Power Systems Design Specialty in the Architectural Engineering program. This sequence includes four courses from the Electrical Engineering and Computer Science Department: Electrical Systems, and …

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A Two-Stage Decoder For Pragmatic Trellis-Coded M-Psk Modulation Using A Symbol Transformation, Robert H. Morelos-Zaragoza, Advait Mogre Jan 2001

A Two-Stage Decoder For Pragmatic Trellis-Coded M-Psk Modulation Using A Symbol Transformation, Robert H. Morelos-Zaragoza, Advait Mogre

Faculty Publications

A two-stage decoding procedure for pragmatic trellis-coded modulation (TCM) is introduced. It applies a transformation from the received I-channel and Q-channel samples onto points in a two-dimensional (2-D) signal space that contains a coset constellation. For pragmatic TCM over M-PSK signal sets with ν coded bits per symbol, ν=1, 2, the signal points in the coset constellations represent cosets of a B/QPSK signal subset-associated with the coded bits-in the original M-PSK signal constellation. A conventional Viterbi decoder operates on the transformed symbols to estimate the coded bits. After reencoding these bits, the uncoded bits are estimated in a second stage, …

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A Method Of Non-Data-Aided Carrier Recovery With Modulation Identification, Robert H. Morelos-Zaragoza, Kenta Umebayashi, Ryuji Kohno Jan 2001

A Method Of Non-Data-Aided Carrier Recovery With Modulation Identification, Robert H. Morelos-Zaragoza, Kenta Umebayashi, Ryuji Kohno

Faculty Publications

A non-data aided carrier recovery technique using modulation format identification is proposed. This technique can also be interpreted as a modulation identification method that is robust against static phase and frequency offsets. The performance of the proposed technique is studied and analytical expressions derived for the mean acquisition time to detect lock in the cases of M-PSK, M=2,4,8, and 16-QAM modulation, with respect to frequency offset and signal-to-noise ratio. The results are verified with Monte Carlo simulations. The main advantage of the proposed method lies in its simpler implementation and faster lock detection, when compared to conventional methods.

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Flowers For The World: Developing A Business Game To Support The Teaching Of Is Concepts, Trevor T. Moores, Jerry Cha-Jan Chang Jan 2001

Flowers For The World: Developing A Business Game To Support The Teaching Of Is Concepts, Trevor T. Moores, Jerry Cha-Jan Chang

Management, Entrepreneurship and Technology Faculty Research

One of the key problems in teaching fundamental concepts in information systems is how to ground the theory in experiences that the students can relate to. To overcome this problem, a business game called Flowers For The World has been developed and used across a wide variety of IS courses. This paper will describe the game and the result of using it for a 300-level course in analysis and design. The possibility exists that the game could be developed to provide a common business foundation across all business school curricula.

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Scanner Parameter Estimation Using Bilevel Scans Of Star Charts, Elisa H. Barney Smith Jan 2001

Scanner Parameter Estimation Using Bilevel Scans Of Star Charts, Elisa H. Barney Smith

Electrical and Computer Engineering Faculty Publications and Presentations

Scanning a high contrast image in bilevel mode results in image degradation. This is caused by two primary effects: blurring and thresholding. This paper expands on a method of estimating a joint distortion parameter, called the edge spread, from a star sector test chart in order to calculate the values of the point spread function width and binarization threshold. This theory is also described for variations in the source pattern which can represent degradations caused by repetition of the bilevel process as would be seen in printing then scanning, or in repeated photocopying. Estimation results are shown for the basic …

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Rules For A Cellular Automaton To Model Quantum-Dot Cellular Automata, Teresa Cole, John C. Lusth Jan 2001

Rules For A Cellular Automaton To Model Quantum-Dot Cellular Automata, Teresa Cole, John C. Lusth

Electrical and Computer Engineering Faculty Publications and Presentations

Quantum-dot cellular automata are one of several new device architectures whose operation is based on local interactions, much like cellular automata. We have implemented several rule sets for a cellular automaton that could be used to model the behavior of quantum-dot cellular automata and used them to test most of the wire and gate configurations proposed for these devices. Arrangements of cells for which any particular cell has neighbors which are not adjacent to each other generally behave as expected. Unfavorable arrangements of cells such as those with bends and crosses tend to either have incorrect outputs or be unstable …

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Design And Applications Of Volume Holographic Optical Elements, Steven C. Dunn Jan 2001

Design And Applications Of Volume Holographic Optical Elements, Steven C. Dunn

Retrospective Theses and Dissertations

Volume gratings were studied both theoretically and experimentally in order to design and analyze practical volume holographic optical elements. The diffraction of finite (Gaussian) beams by transmission gratings is investigated. A closed form solution for the off-Bragg profiles is obtained, and the distortion in the resulting profiles is analyzed. Criteria for when the finiteness of the beam has a minimal effect on the angular selectivity response are given. A model is developed to investigate the cross talk in multiplexed gratings Experimental verification in LiNb03 and PTR glass is demonstrated. The diffraction efficiency and output profiles of finite beams diffracted …

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Numerical Modelling Of Whispering Gallery Modes In Parallel-Plates Type Cylindrical Anisotropic Dielectric Resonators, Yu Prokopenko, Sergey Kharkovsky, M. F. Akay Jan 2001

Numerical Modelling Of Whispering Gallery Modes In Parallel-Plates Type Cylindrical Anisotropic Dielectric Resonators, Yu Prokopenko, Sergey Kharkovsky, M. F. Akay

Electrical and Computer Engineering Faculty Research & Creative Works

A parallel-plates-type cylindrical anisotropic dielectric resonator (DR) with whispering gallery modes (WGMs) has been investigated. Numerical modelling of the resonance frequencies, Q-factors and the electric field filling factors of the isotropic and anisotropic DR are presented. Applications of the results for sensing purposes are discussed.

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Measurement And Monitoring Of Microwave Reflection And Transmission Properties Of Cement-Based Specimens, Sergey Kharkovsky, M. F. Akay, U. C. Hasar, C. D. Atis Jan 2001

Measurement And Monitoring Of Microwave Reflection And Transmission Properties Of Cement-Based Specimens, Sergey Kharkovsky, M. F. Akay, U. C. Hasar, C. D. Atis

Electrical and Computer Engineering Faculty Research & Creative Works

The results of measurement and monitoring of reflection and transmission properties of cement-based specimens (blocks of mortar, concrete) during long time of their service lives, including hydration process, and different curing conditions at microwave frequencies (X-band) are presented. A simple and inexpensive measurement system that utilizes the nondestructive and contactless free space method is used. Dependencies of the reflection and transmission coefficients on water-to-cement ratio, preparing and curing conditions of the specimens are demonstrated. It is shown that the reflection coefficient is approximately stable after hydration process while the transmission coefficient changes during long time of the specimen''s service life. …

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A Committee Of Neural Networks For Automatic Speaker Recognition (Asr) Systems, Viresh Moonasar, Ganesh K. Venayagamoorthy Jan 2001

A Committee Of Neural Networks For Automatic Speaker Recognition (Asr) Systems, Viresh Moonasar, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

This paper describes how the results of speaker verification systems can be improved and made robust with the use of a committee of neural networks for pattern recognition rather than the conventional single-network decision system. It illustrates the use of a supervised learning vector quantization neural network as the pattern classifier. Linear predictive coding and cepstral signal processing techniques are utilized to form hybrid feature parameter vectors to combat the effect of decreased recognition success with increased group size (number of speakers to be recognized)

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Dual Heuristic Programming Excitation Neurocontrol For Generators In A Multimachine Power System, Ganesh K. Venayagamoorthy, Donald C. Wunsch, Ronald G. Harley Jan 2001

Dual Heuristic Programming Excitation Neurocontrol For Generators In A Multimachine Power System, Ganesh K. Venayagamoorthy, Donald C. Wunsch, Ronald G. Harley

Electrical and Computer Engineering Faculty Research & Creative Works

The design of optimal neurocontrollers that replace the conventional automatic voltage regulators for excitation control of turbogenerators in a multimachine power system is presented in this paper. The neurocontroller design is based on dual heuristic programming (DHP), a powerful adaptive critic technique. The feedback variables are completely based on local measurements from the generators. Simulations on a three-machine power system demonstrate that DHP based neurocontrol is much more effective than the conventional PID control for improving dynamic performance and stability of the power grid under small and large disturbances. This paper also shows how to design optimal multiple neurocontrollers for …

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Dynamic Re-Optimization Of A Fed-Batch Fermentor Using Adaptive Critic Designs, Donald C. Wunsch, M. S. Iyer Jan 2001

Dynamic Re-Optimization Of A Fed-Batch Fermentor Using Adaptive Critic Designs, Donald C. Wunsch, M. S. Iyer

Electrical and Computer Engineering Faculty Research & Creative Works

Traditionally, fed-batch biochemical process optimization and control uses complicated off-line optimizers, with no online model adaptation or re-optimization. This study demonstrates the applicability of a class of adaptive critic designs for online re-optimization and control of an aerobic fed-batch fermentor. Specifically, the performance of an entire class of adaptive critic designs, viz., heuristic dynamic programming, dual heuristic programming and generalized dual heuristic programming, was demonstrated to be superior to that of a heuristic random optimizer, on optimization of a fed-batch fermentor operation producing monoclonal antibodies

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The Design And Analysis Of An Analog Ratio Spectrum Circuit, Liping Deng, John G. Harris Jan 2001

The Design And Analysis Of An Analog Ratio Spectrum Circuit, Liping Deng, John G. Harris

Electrical and Computer Engineering Faculty Research & Creative Works

The ratio spectrum (RS) is a novel method for signal analysis that has been successfully demonstrated for speech recognition and coding applications. In this paper, an improved RS circuit with an adaptive tenth-order Butterworth low-pass filter has been designed. We also present the first convergence analysis of the ratio spectrum. We derive linearized convergence expressions for the RS and compare the theoretical predictions to circuit simulations. © 2001 IEEE.

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Cationic Surfactant Mediated Hybridization And Hydrophobization Of Dna Molecules At The Liquid/Liquid Interface And Their Phase Transfer, Murali Sastry, Ashavani Kumar, Mrunalini Pattarkine, Vidya Ramakrishnan, Krishna N. Ganesh Jan 2001

Cationic Surfactant Mediated Hybridization And Hydrophobization Of Dna Molecules At The Liquid/Liquid Interface And Their Phase Transfer, Murali Sastry, Ashavani Kumar, Mrunalini Pattarkine, Vidya Ramakrishnan, Krishna N. Ganesh

Faculty Works

Hybridization of complementary oligonucleotides mediated by a cationic surfactant at the water/hexane interface leads to hydrophobic, double-helical DNA which may be readily phase transferred to the organic phase and cast into thin films on solid substrates.

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Sharing Health-Care Records Over The Internet, Jane Grimson, Gaye Stephens, Benjamin Jung, William Grimson, Damon Berry, Sebastien Pardon Jan 2001

Sharing Health-Care Records Over The Internet, Jane Grimson, Gaye Stephens, Benjamin Jung, William Grimson, Damon Berry, Sebastien Pardon

Articles

Presents a novel approach to sharing electronic health-care records that leverages the Internet and the World Wide Web, developed as part of two European Commission-funded projects, Synapses and SynEx. The approach provides an integrated view of patient data from heterogeneous, distributed information systems and presents it to users electronically. Synapses and SynEx illustrate a generic approach in applying Internet technologies for viewing shared records, integrated with existing health computing environments. Prototypes have been validated in a variety of clinical domains and health-care settings

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Experimental Investigation Of Performance Of A Single Phase Upqc For Voltage Sensitive And Non-Linear Loads, Malabika Basu, S. P. Das, Gopal K. Dubey Jan 2001

Experimental Investigation Of Performance Of A Single Phase Upqc For Voltage Sensitive And Non-Linear Loads, Malabika Basu, S. P. Das, Gopal K. Dubey

Conference papers

A unified power quality conditioner (UPQC) is proposed in this paper. It protects the consumer at the load end from supply voltage sag, and provides unity power factor condition at the utility for different values of load power factor. A PC-based closed loop control scheme is proposed and experimental investigation is carried out in the laboratory. Selected experimental results are reported along with control circuit and phasor diagram to validate the proposition.

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