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1998

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An Efficient, Fast Converging Adaptive Filter For Network Echo Cancellation, Steven L. Grant Jan 1998

An Efficient, Fast Converging Adaptive Filter For Network Echo Cancellation, Steven L. Grant

Electrical and Computer Engineering Faculty Research & Creative Works

This paper discusses a fast efficient adaptive filtering algorithm for network echo cancellers PNLMS++ (proportionate normalized least mean squares ++). Compared to the conventional normalized least mean squares (NLMS) algorithm, PNLMSI++ converges much more quickly when the echo path is sparse. When the echo path is dispersive, the convergence rate is the same as NLMS. In addition, the new algorithm diverges at the same rate and to the same misalignment level as NLMS during periods of undetected double-talk. PNLMS++ is only 50% more computationally complex than NLMS and requires no additional memory

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Designing Power Bus Decoupling For Cmos Devices, S. Radu, Richard E. Dubroff, Todd H. Hubing, Thomas Van Doren Jan 1998

Designing Power Bus Decoupling For Cmos Devices, S. Radu, Richard E. Dubroff, Todd H. Hubing, Thomas Van Doren

Electrical and Computer Engineering Faculty Research & Creative Works

The adequacy of the DC power bus decoupling for CMOS devices can be determined if the effective board decoupling capacitance, the CMOS load capacitance, the CMOS power dissipation capacitance, the switching time, and the allowable bus noise voltage are known. A simple method is presented for estimating the effective decoupling capacitance. The load and power dissipation capacitance values are shown analytically and experimentally to be closely related to the transient current. The transient current and switching time are used to estimate the transient noise voltage on the power bus

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An Upper Limit On The Τ Neutrino Mass From Three- And Five-Prong Tau Decays, R. Barate, M. Thulasidas Jan 1998

An Upper Limit On The Τ Neutrino Mass From Three- And Five-Prong Tau Decays, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

A bound on the tau neutrino mass is established using the data collected from 1991 to 1995 at s√≃mZ with the ALEPH detector. Two separate limits are derived by fitting the distribution of visible energy vs invariant mass in τ−→2π−π+ντ and τ−→3π−2π+(π0)ντ decays. The two results are combined to obtain a 95% confidence level upper limit of 18.2 MeV/c2 on the mass of the tau neutrino.

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Studies Of Quantum Chromodynamics With The Aleph Detector, R. Barate, M. Thulasidas Jan 1998

Studies Of Quantum Chromodynamics With The Aleph Detector, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

No abstract provided.

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Integrating Gis Into The Management Of Vegetation Along Power Line Corridors, William E. Tedder Jan 1998

Integrating Gis Into The Management Of Vegetation Along Power Line Corridors, William E. Tedder

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

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Why Ownership Matters? Entrepreneurship And The Restructuring Of Enterprises In Central Europe, Roman Frydman, Marek P. Hessel, Andrzej Rapaczynski Jan 1998

Why Ownership Matters? Entrepreneurship And The Restructuring Of Enterprises In Central Europe, Roman Frydman, Marek P. Hessel, Andrzej Rapaczynski

Faculty Scholarship

This paper, based on a study of mid-sized firms in the Czech Republic, Hungary, and Poland, seeks to explain the reasons behind the marked impact of ownership on firm performance which has been observed in a number of studies in Eastern Europe and other parts of the world. Focusing in particular on the differential impact of ownership on revenue and cost performance, the paper argues that privatized firms controlled by outside investors are more entrepreneurial than those controlled by corporate insiders or the state. The paper provides evidence that all state and privatized firms in transition economies engage in similar …

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Simulation Of Madmel Power Systems Components, Timothy L. Skvarenina, Oleg Wasynczuk, Paul C. Krause, Steven Pekarek Jan 1998

Simulation Of Madmel Power Systems Components, Timothy L. Skvarenina, Oleg Wasynczuk, Paul C. Krause, Steven Pekarek

Electrical and Computer Engineering Faculty Research & Creative Works

Detailed computer models of system components for More Electric Aircraft have been developed using the Advanced Control System Language (ACSL) and its graphical front-end, Graphic Modeller. Among the devices modeled are a wound-rotor synchronous generator with parallel bridge-rectifier outputs, a switched-reluctance generator, and various loads including a DC-DC converter, an inverter-driven induction motor, and an electro-hydrostatic actuator. Results from the simulations are presented together with corroborating experimental test results. Copyright © 1998 Society of Automotive Engineers, Inc.

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An Automated State Model Generation Algorithm For Simulation/Analysis Of Power Systems With Power Electronic Components, Steven Pekarek, E. A. Walters, T. L. Skvarenina, O. Wasynczuk Jan 1998

An Automated State Model Generation Algorithm For Simulation/Analysis Of Power Systems With Power Electronic Components, Steven Pekarek, E. A. Walters, T. L. Skvarenina, O. Wasynczuk

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a recently developed algorithmic method of deriving the state equations of power systems containing power electronic components is described. Therein the system is described by the pertinent branch parameters and the circuit topology; however, unlike circuit-based algorithms, the difference equations are not implemented at the branch level. Instead, the composite system state equations are established. A demonstration of the computer implementation of this algorithm to model a variable-speed, constant-frequency aircraft generation system is described. Because of the large number of states and complexity of the system, particular attention is placed on the development of a model structure …

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Determination Of Aircraft Orientation For A Vision-Based System Using Artificial Neural Networks, Sanjeev Agarwal, Subhasis Chaudhuri Jan 1998

Determination Of Aircraft Orientation For A Vision-Based System Using Artificial Neural Networks, Sanjeev Agarwal, Subhasis Chaudhuri

Electrical and Computer Engineering Faculty Research & Creative Works

An algorithm for real-time estimation of 3-D orientation of an aircraft, given its monocular, binary image from an arbitrary viewing direction is presented. This being an inverse problem, we attempt to provide an approximate but a fast solution using the artificial neural network technique. A set of spatial moments (scale, translation, and planar rotation invariant) is used as features to characterize different views of the aircraft, which corresponds to the feature space representation of the aircraft. A new neural network topology is suggested in order to solve the resulting functional approximation problem for the input (feature vector)-output (viewing direction) relationship. …

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Electrochemical Characterization Of Copper Deposited On Plasma And Thermally Modified Titanium Surfaces, K. S. Teng, J. L. Delplancke, Jiangfan Zhang, T. J. O'Keefe Jan 1998

Electrochemical Characterization Of Copper Deposited On Plasma And Thermally Modified Titanium Surfaces, K. S. Teng, J. L. Delplancke, Jiangfan Zhang, T. J. O'Keefe

Electrical and Computer Engineering Faculty Research & Creative Works

Thin oxide films were grown at temperatures from 373 to 1073 K in plasma and in air on commercially pure titanium substrates. It was determined that the color, thickness, composition, phase, and polarization behavior in a copper electrolyte varied with operating conditions: temperature, oxygen partial pressure, and plasma composition. High-temperature and high oxygen partial pressure plasma produced a thick oxide film. The surface film structure transformed from TiO2 (anatase) to TiO2 (rutile) at a temperature of 600 °C. A lower oxide of the form TinO2n-1, such as Ti2O3 (which may be porous) or possibly Ti3O5, was formed on a thermally …

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An Analog Vlsi Circuit Implementing An Orthogonal Continuous Wavelet Transform, Dongwei Chen, John G. Harris Jan 1998

An Analog Vlsi Circuit Implementing An Orthogonal Continuous Wavelet Transform, Dongwei Chen, John G. Harris

Electrical and Computer Engineering Faculty Research & Creative Works

We have developed the theory and analog hardware implementation for a Continuous Wavelet Transform (CWT). This novel circuit performs an orthogonal decomposition of temporal signals, such as speech, in a frequency range of 10 Hz to 20 kHz. This multiresolution processor expands the Laguerre structure originally developed by Lee (1960).

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Taking Bicycles Seriously : Three Replicable Urban Bicycle Development Projects, Paul Steely White Jan 1998

Taking Bicycles Seriously : Three Replicable Urban Bicycle Development Projects, Paul Steely White

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

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Exact Graph Coloring For Functional Decomposition: Do We Need It?, Marek Perkowski, Rahul Malvi, Lech Jozwiak Jan 1998

Exact Graph Coloring For Functional Decomposition: Do We Need It?, Marek Perkowski, Rahul Malvi, Lech Jozwiak

Electrical and Computer Engineering Faculty Publications and Presentations

Finding column multiplicity index is one of important component processes in functional decomposition of discrete functions for circuit design and especially Data Mining applications. How important it is to solve this problem exactly from the point of view of the minimum complexity of decomposition, and related to it error in Machine Learning type of applications? In order to investigate this problem we wrote two graph coloring programs: exact program EXOC and approximate program DOM (DOM cab give provably exact results on some types of graphs). These programs were next incorporated into the multi-valued decomposer of functions and relations NVGUD. Extensive …

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Multi-Level Programmable Arrays For Sub-Micron Technology Based On Symmetries, Marek Perkowski, Malgorzata Chrzanowska-Jeske, Yang Xu Jan 1998

Multi-Level Programmable Arrays For Sub-Micron Technology Based On Symmetries, Marek Perkowski, Malgorzata Chrzanowska-Jeske, Yang Xu

Electrical and Computer Engineering Faculty Publications and Presentations

Regular layout is a fundamental concept in VLSI design which can have application in custom design for submicron technologies, designing new architectures for fine-grain Field Programmable Gate Arrays (FPGAs) and Electrically Programmable logic Devices (EPLDs), and minimization of logic functions for existing FPGAs. PLAs are well known examples of regular layouts. Lattice diagrams are another type of regular layouts that have been recently introduced for layout-driven logic synthesis. In this paper we extend and combine theses two ideas, by introducing the multi-level PLA-like structures, composed from multi-output (pseudo) symmetrical lattice planes and other planes (multi-input, multi-output regular blocks). The main …

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Licking The Beaters, Shereeliz E. Caldwell Jan 1998

Licking The Beaters, Shereeliz E. Caldwell

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

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A Novel Thin Film Transistor Using Double Amorphous Silicon Active Layer, Jong Hyuni Choi, Chang-Soo Kim, Byung Cheon Lim, Jin Jang Jan 1998

A Novel Thin Film Transistor Using Double Amorphous Silicon Active Layer, Jong Hyuni Choi, Chang-Soo Kim, Byung Cheon Lim, Jin Jang

Electrical and Computer Engineering Faculty Research & Creative Works

We have fabricated a novel low off-state leakage current thin-film transistor (TFT) using a chlorine incorporated amorphous silicon [a-Si:H(:Cl)] and amorphous silicon (a-Si:H) stacked active layer, in which conduction channel is formed in a-Si:H and a-Si:H(:Cl) is photo-insensitive material. The off-state photo-leakage current of the a-Si:H(:Cl)/a-Si:H TFT is much lower than that a conventional a-Si:H TFT.

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Intellectual Privacy And Censorship Of The Internet, Julie E. Cohen Jan 1998

Intellectual Privacy And Censorship Of The Internet, Julie E. Cohen

Georgetown Law Faculty Publications and Other Works

No abstract provided.

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Emc Applications Of The Emap5 Hybrid Fem/Mom Code, Yun Ji, Todd H. Hubing, Mohammad Wares Ali Jan 1998

Emc Applications Of The Emap5 Hybrid Fem/Mom Code, Yun Ji, Todd H. Hubing, Mohammad Wares Ali

Electrical and Computer Engineering Faculty Research & Creative Works

EMAP5 is a numerical software package designed to model electromagnetic problems. It employs the finite element method (FEM) to analyze three-dimensional volumes, and the method of moments (MOM) to analyze the current distribution on the surface of these volumes. The two methods are coupled through the fields on the dielectric surface. This paper describes the formulation of the EMAP5 code and demonstrates how it can be used to analyze simple printed circuit board configurations

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Lochner In Cyberspace: The New Economic Orthodoxy Of "Rights Management", Julie E. Cohen Jan 1998

Lochner In Cyberspace: The New Economic Orthodoxy Of "Rights Management", Julie E. Cohen

Georgetown Law Faculty Publications and Other Works

Part I of this Article describes the economic models now proffered as the basis for defining rights in digital works, and explores their striking resemblance to the system of social ordering described and advanced in the Supreme Court's Lochner-era decisions. The ghost of Lochner is not invoked lightly, nor with intent to belittle. Lochner represented a particular ideal of social ordering, premised on a seamless convergence of the private-law institutions of property and contract to provide a zone of legal insulation for market outcomes. In the physical world, that vision has long been compromised by evidence of market failures …

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Copyright And The Jurisprudence Of Self-Help, Julie E. Cohen Jan 1998

Copyright And The Jurisprudence Of Self-Help, Julie E. Cohen

Georgetown Law Faculty Publications and Other Works

The proposed draft of Article 2B grants broad rights to enforce electronically contract provisions governing access to and use of digital works. Purveyors of digital works may engage in electronic self-help following breach of contract, and may also elect to foreclose unauthorized uses ex ante, via electronic “regulation of performance.” This Article examines these provisions in light of existing law authorizing self-help repossession of tangible chattels, leading academic justifications for self-help repossession, and federal copyright law and policy. It concludes that the provisions authorize an unprecedented degree of intrusion into private homes and offices, that they lack a sound theoretical …

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"Yer Outa Here!" A Framework For Analyzing The Potential Exclusion Of Expert Testimony Under The Federal Rules Of Evidence, Stephen D. Easton Jan 1998

"Yer Outa Here!" A Framework For Analyzing The Potential Exclusion Of Expert Testimony Under The Federal Rules Of Evidence, Stephen D. Easton

University of Richmond Law Review

It does not take long for even a casual observer of criminal and civil trials to make two observations about expert witnesses. The first of these observations comes almost immediately: experts are vitally important to the judicial process. In many trials, the outcome largely depends upon which set of impressively credentialed experts the jurors (and the judge) believe. The second observation generally comes later than the first: a significant amount of shoddy "science," phony logic, faulty analysis, sleight of hand, and other assorted junk enters the courtroom dressed up in the emperor's clothes of expert testimony.

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A Practical Continually Online Trained Artificial Neural Network Controller For A Turbogenerator, Ganesh K. Venayagamoorthy, Ronald G. Harley Jan 1998

A Practical Continually Online Trained Artificial Neural Network Controller For A Turbogenerator, Ganesh K. Venayagamoorthy, Ronald G. Harley

Electrical and Computer Engineering Faculty Research & Creative Works

This paper reports on the simulation and practical studies carried out on a single turbogenerator connected to an infinite bus through a short transmission line, with a continually online trained (COT) artificial neural network (ANN) controller to identify the turbogenerator, and another COT ANN to control the turbogenerator. This identifier/controller augments/replaces the automatic voltage regulator and the turbine governor. Results are presented to show that this COT ANN identifier/controller has the potential to allow turbogenerators to operate more closely to their steady-state stability limits and nevertheless “ride through” severe transient disturbances such as three phase faults. This allows greater usage …

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The Federalization Of Crime: Too Much Of A Good Thing?, Charles D. Bonner Jan 1998

The Federalization Of Crime: Too Much Of A Good Thing?, Charles D. Bonner

University of Richmond Law Review

Headlines announcing recent declines in crime rates have become commonplace across the United States. In 1997, Atlanta, Georgia, experienced a 22% drop in homicides, an 11% decline in burglaries, and a 21% decline in larceny. In Washington, D.C., the number of homicides dropped 24% in 1997. From 1996 to 1997, the homicide rate in New York fell 23%; in Los Angeles it dropped 20%; and in San Antonio it dropped 17%.

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Annual Survey Of Virginia Law: Criminal Law, Marla Graff Decker, John Hills Mclees Jr. Jan 1998

Annual Survey Of Virginia Law: Criminal Law, Marla Graff Decker, John Hills Mclees Jr.

University of Richmond Law Review

This article summarizes all published criminal law decisions of the Supreme Court of Virginia and the major criminal law decisions of the Virginia Court of Appeals sitting en banc, issued between July 1, 1997, and July 1, 1998. Due to space limitations, however, the article includes only a few selected published panel opinions of the Virginia Court of Appeals. Also, this article includes a summary df the criminal law opinion from the Supreme Court of the United States which arose from a Virginia case during the period stated above. And finally, this article summarizes the most significant enactments from the …

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Substroke Matching By Segmenting And Merging For Online Korean Cursive Character Recognition, Chang-Soo Kim, Kang Ryoung Park, Byung Hwan Jun, Jaihie Kim Jan 1998

Substroke Matching By Segmenting And Merging For Online Korean Cursive Character Recognition, Chang-Soo Kim, Kang Ryoung Park, Byung Hwan Jun, Jaihie Kim

Electrical and Computer Engineering Faculty Research & Creative Works

The Korean character is composed of several alphabets in two-dimensional formation and the total number of Korean characters exceeds eleven thousand. Therefore, the previous approaches to Korean cursive characters pay most of their attention to segmenting a character into alphabets accurately. However, it is difficult because the boundaries of alphabets are not apparent in most cases. We propose an alphabet-based method without assuming accurate alphabet segmentation. In the proposed method, a cursive character is segmented into substrokes by a set of segmenting conditions. Then it is matched with the reference substrokes generated from alphabet models and ligatures by segmenting and …

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The General Approximation Theorem, Donald C. Wunsch, Alexander N. Gorban Jan 1998

The General Approximation Theorem, Donald C. Wunsch, Alexander N. Gorban

Electrical and Computer Engineering Faculty Research & Creative Works

A general approximation theorem is proved. It uniformly envelopes both the classical Stone theorem and approximation of functions of several variables by means of superpositions and linear combinations of functions of one variable. This theorem is interpreted as a statement on universal approximating possibilities ("approximating omnipotence") of arbitrary nonlinearity. For the neural networks, our result states that the function of neuron activation must be nonlinear, and nothing else

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Judges As Advicegivers, Neal K. Katyal Jan 1998

Judges As Advicegivers, Neal K. Katyal

Georgetown Law Faculty Publications and Other Works

Since Alexander Bickel, scholars have understood the Supreme Court to have a threefold power: striking down acts for unconstitutionality, legitimating them, or employing the passive virtues. Professor Katyal contends that the Court wields a fourth power: advicegiving. Advicegiving occurs when judges recommend, but do not mandate, a particular course of action based on a concern for rule or principle. Courts have been giving advice, consciously at times, unconsciously at others, and this article seeks to provide a normative justification for the practice. Professor Katyal breaks down advicegiving into several categories and explains how advice, when given to the political branches, …

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Rediscovering Fuller’S Legal Ethics, David Luban Jan 1998

Rediscovering Fuller’S Legal Ethics, David Luban

Georgetown Law Faculty Publications and Other Works

Lon Fuller is the greatest American philosopher to devote serious attention to the ethics of lawyers. Indeed, he is arguably the greatest philosopher since Plato to do so. I don't suggest that Fuller was a philosopher of Plato's magnitude, but it is not preposterous to mention Plato and Fuller in the same breath. Their unique affinity was that both were thinkers whose broader philosophical concerns may plausibly be said to arise from reflections on the craft of law. In Plato's case, the effort to understand forensic argument, and to analyze why opinions about justice might be persuasive without being true, …

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Microwave Filtering Of Unwanted Oscillations On Base Of Hexagonal Ferrite Composite Thick Films, Marina Koledintseva, Alexander A. Kitaytsev, Andrey A. Shinkov Jan 1998

Microwave Filtering Of Unwanted Oscillations On Base Of Hexagonal Ferrite Composite Thick Films, Marina Koledintseva, Alexander A. Kitaytsev, Andrey A. Shinkov

Electrical and Computer Engineering Faculty Research & Creative Works

The paper is aimed at the design of waveguide filters of lower frequencies using composite thick films (CTF) made of high-anisotropy polycrystalline hexagonal ferrite powders. Theoretical and experimental results describing the possibility of forming the desired frequency characteristic of the filters are presented

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Millimeter Wave Signals Detection By Means Of Monocrystal Hexagonal Ferrite Ellipsoid, Marina Koledintseva, Alexander A. Kitaytsev Jan 1998

Millimeter Wave Signals Detection By Means Of Monocrystal Hexagonal Ferrite Ellipsoid, Marina Koledintseva, Alexander A. Kitaytsev

Electrical and Computer Engineering Faculty Research & Creative Works

Stable nonlinear resonance effects (SNLREs) have been already studied in crystallographically "isotropic" ferrogarnet ferrite resonators (FR), employed as microwave detectors in the frequency range of 300 MHz to 30 GHz. Application of prospective hexagonal monocrystal ferrites with large field of crystallographic magnetic anisotropy leads to the possibility of a gyromagnetic converter (GC) design for mm waveband (from 30 to 200 GHz) without massive external magnets. This paper deals with the analysis of a more general case with taking into account both crystallographic and form anisotropy as well as the arbitrary orientation of the main crystallographic axis with respect to the …

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