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- Electrical and Computer Engineering Faculty Research & Creative Works (6)
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Articles 1 - 30 of 41
Full-Text Articles in Engineering
Electric Power Transmission & Purchases : Report Of A Study By The Joint Standing Committee On Utilities, 112th Maine Legislature, Maine. Legislature. Joint Standing Committee On Utilities
Electric Power Transmission & Purchases : Report Of A Study By The Joint Standing Committee On Utilities, 112th Maine Legislature, Maine. Legislature. Joint Standing Committee On Utilities
Maine Collection
Electric Power Transmission & Purchases : Report Of a Study By the Joint Standing Committee on Utilities, 112th Maine Legislature
Maine Legislature. Joint Standing Committee on Utilities.
Augusta, Maine (December 2, 1986).
Contents: Introduction / Issues & Recommendations / Review of 1986 Legislation / Maine's Electric Power Picture / Technical Analysis of Transmission & Wheeling / Economic Implications of Transmission & Wheeling /. Legals Analysis of Transmission & Wheeling / Proposed Legislation / Appendices / Tables & Figures
Polarizing Beam Splitters For Infrared And Millimeter Waves Using Single-Layer-Coated Dielectric Slab Or Unbacked Films, R. M.A. Azzam
Polarizing Beam Splitters For Infrared And Millimeter Waves Using Single-Layer-Coated Dielectric Slab Or Unbacked Films, R. M.A. Azzam
Electrical Engineering Faculty Publications
No abstract provided.
Response Of The Rotating-Detector Ellipsometer To Incident Partially Polarized Light, R. M.A. Azzam
Response Of The Rotating-Detector Ellipsometer To Incident Partially Polarized Light, R. M.A. Azzam
Electrical Engineering Faculty Publications
No abstract provided.
Metal Waveguide Modeling Of Tapered Quadratic Index Media, Lee W. Casperson, Bahram Zandi
Metal Waveguide Modeling Of Tapered Quadratic Index Media, Lee W. Casperson, Bahram Zandi
Electrical and Computer Engineering Faculty Publications and Presentations
The basic electromagnetic properties of tapered graded index fibers are equivalent to the properties of a class of concave metallic waveguides. Although useful in their own right, such metal waveguides also provide a straightforward and inexpensive means for studying the characteristics of more complicated tapered media.
Second Generation Hybrid Image-Coding Techniques, M. Reha Civanlar, Sarah A. Rajala, Wonrae M. Lee
Second Generation Hybrid Image-Coding Techniques, M. Reha Civanlar, Sarah A. Rajala, Wonrae M. Lee
Sarah A. Rajala
Recently, ways to obtain a new generation of image-coding techniques have been proposed. The incorpordtion of the human visual system (IIVS) models and tools of the image analysis, such as segmentation, are two defining features of these techniques. In this paper, an application of the new approach to the classical linear predictive coding (LPC) of images and an HVS based segmentation technique for the second genera-tion coders will be discussed. In the case of LPC, the error image is encoded using an image decomposition approach and binary image coding. This improves the compression ratio keeping the quality nearly the same. …
Implementation Of A Projection Onto Convex Sets Iteration Based Image Coder, M. Reha Civanlar, Sarah A. Rajala, Thomas K. Miller
Implementation Of A Projection Onto Convex Sets Iteration Based Image Coder, M. Reha Civanlar, Sarah A. Rajala, Thomas K. Miller
Sarah A. Rajala
Projection onto convex sets iteration based image coding, where efficiently encodable sets are used to describe an image, is a recent approach to image compression. The technique allows the use of a variety of sets to encode an image. The focus of this paper, however, will be on two particular sets: the set of images whose cosine transform is known for certain frequencies and the set of images which are nonzero over a specified region. These sets can be used to encode interframe difference pictures of video teleconferencing images. A drawback of this new type of codec is its computational …
Thin-Film Beam Splitter That Reflects Light As A Half-Wave Retarder And Transmits It Without Change Of Polarization: Application To A Michelson Interferometer, R. M.A. Azzam
Electrical Engineering Faculty Publications
The refractive index n1 of a transparent layer of quarter-wave optical thickness coating a transparent substrate of refractive index n2 can be chosen to produce half-wave retardation (HWR) in reflection and no change of polarization in refraction at any angle of incidence ø. The function n1(ø, n2), and the associated polarization-independent reflectance of the film-substrate system R(ø, n2) are determined. Such a coated surface can be used as a beam splitter with excellent characteristics (e.g., split fractions that do not depend on source polarization, a split beam whose polarization is identical …
Editing Templates: A User Interface Generation Tool, Dan R. Olsen Jr.
Editing Templates: A User Interface Generation Tool, Dan R. Olsen Jr.
Faculty Publications
This article discusses a basic architecture for a user interface management system and the problem of updating a display in response to interactive commands. The basic architecture is then extended to include basic editing and browsing processes on arbitrary data structures. Editing templates are presented as a technique embodying the entire manipulation process for a particular data structure/data display combination. In conjuction with the user interface management system, Such templates are able to automatically provide a majority of the code required in an interactive applicaton.
Focused Acoustic Wave (Faw) Channelizer, Dennis R. Pape, Andrew M. Bardos, Marc H. Popek, Manhar L. Shah
Focused Acoustic Wave (Faw) Channelizer, Dennis R. Pape, Andrew M. Bardos, Marc H. Popek, Manhar L. Shah
Electrical Engineering and Computer Science Faculty Publications
The architecture, operation, and performance of a new integrated acoustic RF channelizer are described. The all- acoustic device uses a phased array piezoelectric transducer to generate frequency dispersed bulk acoustic waves over a 500 MHz bandwidth. The waves are focused onto a 25 channel receiver electrode array by a cylindrical reflector formed on the opposing surface of the device. This channelizer has the potential of providing higher dynamic range than competing technologies. © 1986 SPIE.
The Abel Inversion Of Noisy Data Using Discrete Integral Transforms, Subramania I. Sudharsanan
The Abel Inversion Of Noisy Data Using Discrete Integral Transforms, Subramania I. Sudharsanan
Masters Theses
The determination of a radially symmetric two-dimensional function from its one dimensional projection is known as Abel inversion. This finds applications in several fields of engineering and science including astronomy, image processing, plasma diagnostics and optics. One radial slice of the function, which completely specifies the two-dimensional function, is the inverse Hankel transform of the Fourier Transform of the projection. With the projection data available as a discrete signal, the Abel inversion can be performed using the discrete Fourier transform and the inverse Hankel transform. The existing techniques to compute inverse Hankel transforms are discussed and a modification to one …
Relationship Between The P And S Fresnel Reflection Coefficients Of An Interface Independent Of Angle Of Incidence, R. M.A. Azzam
Relationship Between The P And S Fresnel Reflection Coefficients Of An Interface Independent Of Angle Of Incidence, R. M.A. Azzam
Electrical Engineering Faculty Publications
The Fresnel reflection coefficients rp and rs of p- and s-polarized light at the planar interface between two linear isotropic media are found to be interrelated by (rs - rp)/(1 - rsrp) = cos 2β, independent of the angle of incidence ø, where tan2β = ∊ and ∊ is the (generally complex) ratio of dielectric constants of the media of refraction and incidence. This complements another relation (found earlier), (r2s - rp)/(rs - rsrp) = …
A Log-Spiral, Radiating-Line Antenna, James L. Drewniak, P. E. Mayes, D. Tanner, R. Waller
A Log-Spiral, Radiating-Line Antenna, James L. Drewniak, P. E. Mayes, D. Tanner, R. Waller
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
Production Test Station Networking And Collection Of Test Results, Dennis Wallace Matheson
Production Test Station Networking And Collection Of Test Results, Dennis Wallace Matheson
Masters Theses
This thesis describes the installation of a network for all of the final test stations at the Industrial Systems Division of Texas Instruments in Johnson City, Tennessee. Once the network was installed, the project focused on the automatic collection of the test parameters for a centrallized database. The database was used to generate statistical data to determine if the manufacturing process were in control. If the process were not in control, then appropriate action was taken to prevent the particular unit from being tested. This provided a accurate and real-time analysis of how the manufacturing process was performing. Also, the …
The Acquisition Of Direct Sequence Spread Spectrum Communication Systems, Anthony Donald Demeri
The Acquisition Of Direct Sequence Spread Spectrum Communication Systems, Anthony Donald Demeri
Theses
This Paper surveys different techniques of acquiring Direct Sequence Spread Spectrum Systems.
It classifies different systems, indicates the strongpoints and weakness of each, along with some applications.
One method, The Single Dwell Serial PN Acquisition System is then focused on in detail. The detail includes analysis of standard version, derivation of the mean time to acquire, the variance, the probability of detection and the probability of a false alarm.
In the last section of the paper the analytical results of the Single Dwell Serial PN Acquisition System shall be confirmed by computer simulation.
Measurements Of Basic Semiconductor Properties, Abdolreza Ariantaj
Measurements Of Basic Semiconductor Properties, Abdolreza Ariantaj
Theses
Mobility, resistivity, and total impurity concentration of several purchased p-type silicon samples with known resistivities were measured by Hall effect, experiments utilizing the Van Der Pauw method. The silicon samples will serve as Hall effect standards for future measurements on other semiconductor materials, particularly gallium nitride ion cluster beam (ICB) deposited thin films. The samples which were Freshly etched with hydrofluoric acid had measurement values of 455 cm ² / V.sec, 45.9 Ω cm, and 2.6 X 1014 cm³ for mobility, resistivity, and total impurity concentration, respectively. The mobility values were within 9.9 per cent, of the published values …
Reliability Studies On Solid Tantalum Electrolytic Capacitors By Means Of Accelerated Life Tests, Venkata R. Golthi
Reliability Studies On Solid Tantalum Electrolytic Capacitors By Means Of Accelerated Life Tests, Venkata R. Golthi
Theses
The purpose of this thesis is to understand the failure mechanisms in Solid Tantalum Capacitors encapsulated in plastic, and to suggest the precautionary measures that prevent the occurrence of these failures.
The reliability of Solid Tantalum Capacitors encapsulated in plastic is of considerable interest because in some applications where the mechanical accelerations or shocks are considerable the "better" "hermitically" sealed type are not able to sustain themselves. Poor adherence between the dielectric film and the base metal Tantalum under the conditions of sudden mechanical shocks, causes problems.
Our study was carried out in two different directions, theoretical and experimental. The …
Maine Yankee Shutdown Assessment: A Report To Governor Joseph E. Brennan, Maine State Planning Office
Maine Yankee Shutdown Assessment: A Report To Governor Joseph E. Brennan, Maine State Planning Office
Maine Collection
Maine Yankee Shutdown Assessment: A Report to Governor Joseph E. Brennan
Maine State Planning Office, Maine Office of Energy Resources, Maine Public Advocate
Executive Department - May 1986
Contents: Legal Process / Decommissioning Constraints and Costs / Public and Economic Costs and Benefits / Apprendices
Two-Step Optimal Thermal Generation Scheduling, B Fardanesh, F. Eugenio Villaseca
Two-Step Optimal Thermal Generation Scheduling, B Fardanesh, F. Eugenio Villaseca
Electrical and Computer Engineering Faculty Publications
A new approach to the solution of the optimal thermal generation scheduling problem is presented. The problem is solved in two steps. As a first step, the optimal production schedule for the next day is obtained based on a daily load forecast, reserve capacity requirements, and present status of generating units. The second-step algorithm uses the results of the first step and adjusts the previous schedule to meet new constraints developed during the course of the day. Variable truncation dynamic programming is proposed as a new method to reduce computation effort. To eliminate the need for solving the …
Design And Applications Of A Graphics Package For The Hp1000 Computer., Hsiao-Chih George Lee
Design And Applications Of A Graphics Package For The Hp1000 Computer., Hsiao-Chih George Lee
Electronic Theses and Dissertations
The objective of this thesis is to develop the FORTRAN subroutine PLOTER which is a general-purpose plotting tool to plot charts on a Hewlett Packard plotter. The programs RESP and INVLAP which can plot the frequency and time responses of system functions are modified to adopt the PLOTER subroutine and are stored of the HP1000-A900 minicomputer whose software, the GRAPHICS/1000, supports the graphics ability of PLOTER. This thesis describes the theories, functions, software techniques and operations of the PLOTER subroutine and the application programs RESP and the INVLAP. It also provides program listings and example plots.
Evidence For Amphoteric Behavior Of Ru On Cdte Surfaces, D. N. Bose, S. Basu, K. C. Mandal, D. Mazumdar
Evidence For Amphoteric Behavior Of Ru On Cdte Surfaces, D. N. Bose, S. Basu, K. C. Mandal, D. Mazumdar
Faculty Publications
No abstract provided.
Differentiation Of Murine Erythroleukemic Cells During Exposure To Microwave Radiation, Roger F. Brown, S. V. Marshall
Differentiation Of Murine Erythroleukemic Cells During Exposure To Microwave Radiation, Roger F. Brown, S. V. Marshall
Biological Sciences Faculty Research & Creative Works
Cultures of murine erythroleukemic cells undergoing erythroid differentiation in response to induction by hexamethylene bisacetamide (HMBA) were exposed to 1180-MHz microwave (MW) radiation for 48 h while maintained at 37.4°C by variable-temperature air flow. Exposures at 1180 MHz were at 5.5, 11, and 22 mW/cm2 with a normalized specific absorption rate of 3.32 W/kg per mW/cm2. HMBA-induced control cells were incubated in a 37.4°C water bath. Mean cell doubling time was 16.5 h in both the irradiated cultures and the control cultures. About 65% of the cells of irradiated cultures and control cultures were benzidine-positive differentiated cells. Both the irradiated …
State-Feedback Control Of Non-Linear Systems, Stanislaw H. Żak, Carl A. Maccarley
State-Feedback Control Of Non-Linear Systems, Stanislaw H. Żak, Carl A. Maccarley
Electrical Engineering
A design method for state-feedback controllers for single-input non-linear systems is proposed. The method makes use of the transformations of the non-linear system into ‘controllable-like’ canonical forms. The resulting non-linear state feedback is designed in such a way that the eigenvalues of the linearized closed-loop model are invariant with respect to any constant operating point. The method constitutes an alternative approach to the design methodology recently proposed by Baumann and Rugh. Also a review of different transformation methods for non-linear systems is presented. An example and simulation results of different control strategies are provided to illustrate the design technique.
An Exact Analysis For Efficient Computation Of Random-Pattern Testability In Combinational Circuits, Sharad C. Seth, Bhargab B. Bhattacharya, Vishwani Agrawal
An Exact Analysis For Efficient Computation Of Random-Pattern Testability In Combinational Circuits, Sharad C. Seth, Bhargab B. Bhattacharya, Vishwani Agrawal
CSE Conference and Workshop Papers
Experimental evidence shows that low testability in a typical circuit is much more likely due to poor observability than poor controllability. Thus, from theoretical and practical standpoints, it is important to develop an accurate model for observability computation. One such model, in terms of supergates, is proposed in the first part of this paper thus complimenting our earlier work. It is now possible to obtain exact random-pattern testability for each line in a circuit.
The second part of the paper analyzes the supegate structure of a circuit from a graph theoretic viewpoint. Finding a supergate is related to determining the …
Proposed Structure For Large Quantum Interference Effects, S. Datta, Michael R. Melloch, S. Bandyopadhyay, Mark S. Lundstrom
Proposed Structure For Large Quantum Interference Effects, S. Datta, Michael R. Melloch, S. Bandyopadhyay, Mark S. Lundstrom
Department of Electrical and Computer Engineering Faculty Publications
In this letter we propose and analyze a new semiconductor structure that can be fabricated by present day technology and can lead to large quantum interference effects with potential device applications.
Effect Of Impurity Trapping On The Capacitance‐Voltage Characteristics Of N‐Gaas/N‐Algaas Heterojunctions, K. L. Tan, Mark S. Lundstrom, Michael R. Melloch
Effect Of Impurity Trapping On The Capacitance‐Voltage Characteristics Of N‐Gaas/N‐Algaas Heterojunctions, K. L. Tan, Mark S. Lundstrom, Michael R. Melloch
Department of Electrical and Computer Engineering Faculty Publications
We have studied the capacitance-voltage (C- V) characteristics of Schottky barriers on inverted nGaAs/ N-AIGaAs and normal N-AIGaAs/n-GaAs heterojunctions. Impurities introduced during film growth produced a negative sheet charge of 6.0 X 10 II cm -2 at the interface of the inverted n-GaAs/N-AIGaAs heterojunction. The effectiveness of GaAs quantum wells in trapping these impurities was investigated. GaAs quantum wells 20 A wide were placed in intervals of 2500 A for the first 0.75 pm of the AIGaAs layer; in the last 0.25 pm, the periodicity of the quantum wells was progressively decreased by half with the last quantum well placed …
A Loran-C Antenna Coupling Unit., Timothy Andrew Reilly 1963-
A Loran-C Antenna Coupling Unit., Timothy Andrew Reilly 1963-
Electronic Theses and Dissertations
This project is the design of an antenna-coupling unit (ACU) that will operate with the Texas Instruments LORAN-C receiver and a 28-inch antenna. The height of the antenna used at the present is eight feet. Since the application of LORAN-C positioning is being expanded to vehicular location, an eight-foot antenna is not practical. The shorter antenna is necessary to prohibit striking trees, overpasses, etc. The newly designed ACU has more voltage gain to compensate for the attenuation of the incoming signal due to the shortening of the antenna. It also has a bandpass of 90 KHz-110 KHz with the center …
Fast Discharges In Thin Liquid Layers, Charles J. Frei, Aidan O'Dwyer
Fast Discharges In Thin Liquid Layers, Charles J. Frei, Aidan O'Dwyer
Conference papers
Several mechanisms can be at work when electrical discharges occur across a thin layer of an insulating liquid. The evidence is derived from the time-lag distributions of series of consecutive discharges when the measurements are performed with a sequence of constant voltage pulses.
Quadtree-Based Processing Of Digital Images, Ramin Naderi
Quadtree-Based Processing Of Digital Images, Ramin Naderi
Dissertations and Theses
Image representation plays an important role in image processing applications, which usually. contain a huge amount of data. An image is a two-dimensional array of points, and each point contains information (eg: color). A 1024 by 1024 pixel image occupies 1 mega byte of space in the main memory. In actual circumstances 2 to 3 mega bytes of space are needed to facilitate the various image processing tasks. Large amounts of secondary memory are also required to hold various data sets.
In this thesis, two different operations on the quadtree are presented.
There are, in general, two types of data …
An Interactive Power System Analyzer With Graphics For Educational Use, Chin Hwanglo, Max Darwin Anderson, Earl F. Richards
An Interactive Power System Analyzer With Graphics For Educational Use, Chin Hwanglo, Max Darwin Anderson, Earl F. Richards
Electrical and Computer Engineering Faculty Research & Creative Works
The paper presents a student-oriented power system analyzer with an interactive graphics display. Its capabilities include studies of (1) load flow, (2) load and generation, (3) voltage level control, (4) economic dispatch, and (5) contingency and planning analysis. Power network configurations of up to 30 buses can be presented clearly on one screen. The interactive nature of this program makes such studies effective and easy to use. With the support of a computer with graphics software and many graphics terminals, this program can be a useful teaching tool for power system studies. Copyright © 1986 by The Institute of Electrical …
Data Structure Implementation And Investigation For A Prolog Language Interpreter, Hector Iurcovich
Data Structure Implementation And Investigation For A Prolog Language Interpreter, Hector Iurcovich
Retrospective Theses and Dissertations
A developmental Prolog language interpreter is constructed in the C programming language. The data type format is a subset of that of the Project Aquarius Prolog Engine proposed and under development at the University of California, Berkley. The design of the Prolog interpreter is part of an investigation at UCF in design of expert system architecture for real time applications. The interpreter facilities of data structure definition and manipulation are developed and applied. The list data structure is used as an example data structure. The scheme for representing structured data is based on the Lisp cons cell. Run-time generated lists …