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Articles 45481 - 45510 of 46182
Full-Text Articles in Entire DC Network
A Hypermedia Implementation For Reusable Software Component Representation, Gary G. Worrall
A Hypermedia Implementation For Reusable Software Component Representation, Gary G. Worrall
Theses and Dissertations
This study investigated software component representation methods. Hypermedia was chosen as the implementation method to represent a collection of reusable software components. The hypermedia implementation organizes knowledge about the component collection into a web of small information chunks called frames. The set of software components was represented using a hybrid classification scheme composed of enumerated and faceted parts. The enumerated part enables the user to progress along a path in a taxonomic tree, narrowing the scope of eligible components. Each leaf node in this tree denotes a class of components, members of which are distinguished by their time and space …
A Remote Visual Interface Tool For Simulation Control And Display, William J. Derouchey
A Remote Visual Interface Tool For Simulation Control And Display, William J. Derouchey
Theses and Dissertations
This thesis discusses the design and development of the Visual Interactive Simulation Interface Tool (VISIT). VISIT was designed to provide the graphical representation and user interface for a simulation that is running on another processor utilizing internet communications. The system provides support for various input devices to control the simulation display and environment. Simulation objects are displayed using either a three-dimensional wireframe representation or a Gouraud shaded representation. Viewer interaction to the simulation is provided by a collection of commands that allow the viewer to initialize, start, stop, abort, and restart the simulations. The viewer also has the ability to …
An Evaluation Of An Ada Implementation Of The Rete Algorithm For Embedded Flight Processors, F. Jesse Fanning
An Evaluation Of An Ada Implementation Of The Rete Algorithm For Embedded Flight Processors, F. Jesse Fanning
Theses and Dissertations
The purpose of this thesis was to design and develop an expert system shell in Ada, and to evaluate the shell's execution and size performance to determine its suitability for real-time operation on the MIL-STD-1750A embedded flight processor. The expert system shell uses the CLIPS/Ada inference engine, a forward-chaining Ada implementation of Rete. The expert system shell design is presented along with an overview of the target environment--the MIL-STD-1750A VHSIC Avionic Modular Processor (VAMP) running under the Ada Avionics Real-Time Software (AARTS) Operating System. Theoretical and empirical complexity analyses of the inference engine are presented and discussed in view of …
Computer Model Of An Injection Locked Pulsed Co2 Laser, Allen M. Susie
Computer Model Of An Injection Locked Pulsed Co2 Laser, Allen M. Susie
Theses and Dissertations
With the discovery of the laser there have been continual attempts to increase the 'spectral brightness' of a laser for applications such as signal processing and lidar. To this end techniques using either passive or active cavity elements have been developed to isolate a single longitudinal mode in both continuous and pulsed laser systems. Although passive elements have useful applications in continuous systems their use in pulsed systems is difficult to control. The injection of an external signal has proved very successful.
A Compact Optical Associative Memory Using Dynamic Holographic Storage Media And Photorefractive Gain And Attenuation Elements, Thomas J. Burns
A Compact Optical Associative Memory Using Dynamic Holographic Storage Media And Photorefractive Gain And Attenuation Elements, Thomas J. Burns
Theses and Dissertations
This research effort implemented a compact optical associative memory architecture consisting of a Fabry-Perot Confocal Resonator (FPCR) optical processing environment, two dynamically reprogrammable Lithium Niobate volume holograms, and Barium Titanate gain and attenuation elements. The reduced physical dimensions of the compact optical processing environment make it more adaptable to military applications than previous associative memory designs. The FPCR employs Mangin mirrors designed to reduce spherical aberrations in off-axis rays. The orientation of the gain element's grating vector angle and the model used to predict the profile of the attenuation element were unique to this research effort. The object stored in …
A Biologically-Inspired Neural Network Architecture For Image Processing, Laurence E. Lazofson
A Biologically-Inspired Neural Network Architecture For Image Processing, Laurence E. Lazofson
Theses and Dissertations
This thesis project included a literature survey of biological and artificial neural network research followed by development and testing of high- order and image recognition hierarchical neural network algorithms. Following training, performance testing of second-order and third-order networks yielded maximum accuracies comparable to those achieved by multilayer perceptron classifiers operating on test data sets. Several versions of an image classification algorithm were tested for learning performance using pixel data from forward-looking infrared (FLIR) images of tanks, trucks, target boards, and clutter. Employing the biologically-motivated Lambertization and contrast normalization of pixel windows, correlations with multiple Gabor function wavelets, and a 'phase …
Model-Based 3-D Recognition System Using Gabor Features And Neural Networks, Phung D. Le
Model-Based 3-D Recognition System Using Gabor Features And Neural Networks, Phung D. Le
Theses and Dissertations
A different approach to pattern recognition was attempted using Gabor features, artificial neural nets, and an image generator. The Gabor features and artificial neural nets are sound biological-based, and the image generator provides complete access to any view of an object. This thesis tested the idea that their integration could form a robust 3-D recognition system. The results of the research showed that the Gabor features together with a neural net were used successfully in classifying objects regardless of their positions, out-of- plane rotations, and to a lesser extent in-plane rotations. The Gabor features were obtained by correlating the image …
Optical Image Segmentation Using Wavelet Filtering Techniques, Christopher P. Veronin
Optical Image Segmentation Using Wavelet Filtering Techniques, Christopher P. Veronin
Theses and Dissertations
This research effort successfully implemented an automatic, optically based image segmentation scheme for locating potential targets in a cluttered FLIR image. Such a design is critical to achieve real-time segmentation and classification for machine vision applications. The segmentation scheme used in this research was based on texture discrimination and employs orientation specific, bandpass spatial filters as its main component. The orientation specific, bandpass spatial filters designed during this research include symmetrically located circular apertures implemented on heavy, black aluminum foil; cosine and sine Gabor filters implemented with detour-phase computer generated holography photoreduced onto glass slides; and symmetrically located circular apertures …
Using Error Detection And Correction Coding For A Turbulent Atmospheric Optical Communications Link, Mark A. Cloutier
Using Error Detection And Correction Coding For A Turbulent Atmospheric Optical Communications Link, Mark A. Cloutier
Theses and Dissertations
Probability of bit error (Pb) performance for a turbulent, atmospheric, optical, communications link with convolutional error detection and correction coding was investigated. The codes investigated were all rate 1/2 codes with constraint lengths ranging from 3 to 7. It was assumed that the coded data stream was sufficiently interleaved so that the turbulent channel could be considered memoryless. A theoretical bound on Pb, given by Viterbi for a memoryless channel, was used to plot curves of Pb versus the signal intensity of last transmitter. These curves were plotted for three different levels of atmospheric turbulence and three …
Nonlinear Interferometry: Optical Image Addition/Subtraction And Novelty Filters, Gordon T. Hengst
Nonlinear Interferometry: Optical Image Addition/Subtraction And Novelty Filters, Gordon T. Hengst
Theses and Dissertations
This thesis investigated the performance characteristics of a beam fanning novelty filter and designed a switchable optical image adder/subtractor. The filter spatial resolution, contrast ratio, onset time, and velocity response were measured for both z-cut and 45 deg. cut BaTiO3 crystals in the beam fanning configuration. Experimental results show that the special 45 deg. cut crystal produces the best overall beam fanning novelty filter. In addition, switchable optical image subtraction and addition were demonstrated for the first time using a modified Michelson interferometer configured with a phase-conjugating mirror and an adjustable length leg. The system demonstrated addition and subtraction with …
A Comparison Of Human-Computer Interfaces In Air Force Organizations, Michael G. Morris
A Comparison Of Human-Computer Interfaces In Air Force Organizations, Michael G. Morris
Theses and Dissertations
This thesis investigated differences in organizational efficiency and effectiveness for users of graphical user interfaces and text-based interfaces on personal computers in Air Forces offices. Areas of interest included amount of time required to learn the basic system, amount of time required to learn new application, users' ratings of user-friendliness, users' perceptions of the extent that their system help them perform in their job, the number of software packages used on the job by users of each system, user satisfaction, responsible authorities' ratings of quality of output, and the relationship between user job experience level and interface used on the …
A Whole Word And Number Reading Machine Based On Two Dimensional Low Frequency Fourier Transforms, Mark A. O'Hair
A Whole Word And Number Reading Machine Based On Two Dimensional Low Frequency Fourier Transforms, Mark A. O'Hair
Theses and Dissertations
The Fourier transform is investigated as a means for developing an optical reader capable of reading a large vocabulary without segmenting the image of a word into individual characters. The reader is capable of reading printed and cursive font styles, is scale invariant, and is substantially insensitive to noise. The image of a particular word is treated as a single symbol; the two dimensional low frequency Fourier coefficients (assuming n coefficients are calculated) define the word's location on an n dimensional hypersphere of unit radius. The distance between individual locations (words) categorizes similar and dissimilar words. The smaller the distance, …
An Object Oriented Design And Implementation Of The Idef0 Essential Data Model Using Ada And An Ada Based Expert System, Terry L. Kitchen
An Object Oriented Design And Implementation Of The Idef0 Essential Data Model Using Ada And An Ada Based Expert System, Terry L. Kitchen
Theses and Dissertations
This thesis develops and implements an Ada based object oriented design (OOD) of the IDEF0 Essential Data Model called the Essential Subsystem, which includes an Ada based expert system for IDEF0 model syntax checking. IDEF0 is a graphic approach to system description development by SofTech, Inc. for the U.S. Air Force Program for Integrated Computer Aided Manufacturing (ICAM) and is a subset of the Structured Analysis (SA) language (30, 36). The IDEF0 Essential Data Model is an entity-relationship (E-R) model of the IDEF0 language and represents the fundamental (essential) information of an IDEF0 model. …
An Object-Oriented Military Simulation Baseline For Parallel Simulation Research, Robert J. Rizza
An Object-Oriented Military Simulation Baseline For Parallel Simulation Research, Robert J. Rizza
Theses and Dissertations
This thesis documents the design and implementation of a discrete event military simulation using a modular object-oriented design and the C programming language. The basis simulation is one of interacting objects. The objects move along a predetermined path until they encounter another object. Objects react to the encounter object according to the implemented algorithm. Object reaction options are fight, evade, or do nothing. In the code's current form it is generic enough to allow a user the flexibility of creating an infinite number of scenarios bounded in size by the hardware's memory capacity. The modularity of design will allow for …
Detection Of High Altitude Aircraft Wake Vortices Using Infrared Doppler Lidar: An Assessment, Michael J. Estes
Detection Of High Altitude Aircraft Wake Vortices Using Infrared Doppler Lidar: An Assessment, Michael J. Estes
Theses and Dissertations
This thesis investigated the feasibility of air-to-air detection of high altitude aircraft wake vortices at long ranges using infrared Doppler lidar. The purpose of this technique is to detect otherwise stealthy aircraft. Three laser wavelengths were analyzed: 1.064, 2.091, and 9.115 microns. Analysis revealed that the spectral width of the return signal from an aircraft wake presented a good signature for detection. Based on the analysis, a minimum signal-to-noise ratio of 0 db was established. Detection performance was then analyzed using signal-to-noise ratio calculations for backscatter by ambient atmospheric aerosols, jet engine exhaust soot particles, and condensation trail ice particles. …
A Performance Predication Model For Parallel Compilers, Ko-Yang Wang
A Performance Predication Model For Parallel Compilers, Ko-Yang Wang
Department of Computer Science Technical Reports
No abstract provided.
An Interactive Symbolic-Numeric Interface To Parallel Ellpack For Building General Pde Solvers, S. Weerawarana, Elias N. Houstis, John R. Rice
An Interactive Symbolic-Numeric Interface To Parallel Ellpack For Building General Pde Solvers, S. Weerawarana, Elias N. Houstis, John R. Rice
Department of Computer Science Technical Reports
No abstract provided.
Implementation And Performance Of A Communication Facility For Distributed Transaction Processing, Enrique Mafla, Bharat Bhargava
Implementation And Performance Of A Communication Facility For Distributed Transaction Processing, Enrique Mafla, Bharat Bhargava
Department of Computer Science Technical Reports
No abstract provided.
On Good Triangulations In Three Dimensions, Tamal K. Dey, Chanderjit L. Bajaj, Kokichi Sugihara
On Good Triangulations In Three Dimensions, Tamal K. Dey, Chanderjit L. Bajaj, Kokichi Sugihara
Department of Computer Science Technical Reports
No abstract provided.
Experiences With Parallelizing A Distributed Database System, Bharat Bhargava, Janche Sang, Yin-He Jiant
Experiences With Parallelizing A Distributed Database System, Bharat Bhargava, Janche Sang, Yin-He Jiant
Department of Computer Science Technical Reports
No abstract provided.
Compiling Programs For Nonshared Memory Machines, Charles Koelbel
Compiling Programs For Nonshared Memory Machines, Charles Koelbel
Department of Computer Science Technical Reports
No abstract provided.
Segment Streaming For Efficient Pipelined Televisualization, Fengmin Gong
Segment Streaming For Efficient Pipelined Televisualization, Fengmin Gong
All Computer Science and Engineering Research
The importance of scientific visualization for both science and engineering endeavors has been well recognized. Televisualization becomes necessary because of the physical distribution of data, computation resources, and users involved in the visualization process. However, televisualization poses a number of challenges to the designers of communication protocols. A pipelined televisualization (PTV) model is proposed for efficient implementation of a class of visualization applications. Central to the proposed research is the development of a segment of streaming IPC (interprocess communication) mechanism in support of efficient pipelining across very high speed internetworks. This requires exploration of special issues arising from extending a …
Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, November 1990, College Of Engineering And Computer Science, Wright State University
Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, November 1990, College Of Engineering And Computer Science, Wright State University
BITs and PCs Newsletter
A ten page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.
Forecasting The Behavior Of Multivariate Time Series Using Neural Networks, Kanad Charkraborty, Kishan Mehrotra, Chilukuri K. Mohan, Sanjay Ranka
Forecasting The Behavior Of Multivariate Time Series Using Neural Networks, Kanad Charkraborty, Kishan Mehrotra, Chilukuri K. Mohan, Sanjay Ranka
Electrical Engineering and Computer Science - Technical Reports
This paper presents a neural network approach to multivariate time-series analysis. Real world observations of flour prices in three cities have been used as a benchmark in our experiments. Feedforward connectionist networks have been designed to model flour prices over the period from August 1972 to November 1980 for the cities of Buffalo, Minneapolis, and Kansas City. Remarkable success has been achieved in training the networks to learn the price curve for each of these cities, and thereby to make accurate price predictions. Our results show that the neural network approach leads to better predictions than the autoregressive moving average(ARMA) …
A Graphical Knowledge Level Approach For User-Database Interaction, K. Tan, H. Chan, Keng Siau
A Graphical Knowledge Level Approach For User-Database Interaction, K. Tan, H. Chan, Keng Siau
Research Collection School Of Computing and Information Systems
The authors propose a novel user interface, the Graphical Knowledge Level interface, for user-database interaction. This interface addresses two of the current research problems: the semantic inadequacy of the relational model and the logical data dependence of the relational languages. The interface is more user-friendly than the SOL interface and the Universal Relation interface, as it employs the graphical approach. The semantic inadequacy problem is alleviated by using an enhanced entity-relationship model. This data model includes abstraction concepts such as aggregation, generalization, and categorization. A formal, high-level Graphical Knowledge Level Query Language, GKQL, which provides for both logical and physical …
Fiber Distributed Data Interface, Piyush Kulshreshiha
Fiber Distributed Data Interface, Piyush Kulshreshiha
Department of Computer Science Technical Reports
No abstract provided.
Specification And Execution Of Transactions For Advanced Database Applications, Y. Leu, Ahmed K. Elmagarmid, N. Boudriga
Specification And Execution Of Transactions For Advanced Database Applications, Y. Leu, Ahmed K. Elmagarmid, N. Boudriga
Department of Computer Science Technical Reports
No abstract provided.
Eclipse: A System For High Performance Concurrent Simulation, V. S. Sunderam, Vernon J. Rego
Eclipse: A System For High Performance Concurrent Simulation, V. S. Sunderam, Vernon J. Rego
Department of Computer Science Technical Reports
No abstract provided.
Software Performance Evaluation Papers In Toms, Volumes 1-15, John R. Rice
Software Performance Evaluation Papers In Toms, Volumes 1-15, John R. Rice
Department of Computer Science Technical Reports
No abstract provided.
Optimal Parallel Solutions To The Neighbor Localization Problem And Integer Sorting: A Fine Grained Approach, Ramachandran Vaidyanathan, Carlos R.P. Hartmann, Pramod K. Varshney
Optimal Parallel Solutions To The Neighbor Localization Problem And Integer Sorting: A Fine Grained Approach, Ramachandran Vaidyanathan, Carlos R.P. Hartmann, Pramod K. Varshney
Electrical Engineering and Computer Science - Technical Reports
In this report, a fine-grained decomposition approach is used to obtain an optimal parallel solution to the Neighbor Localization Problem, which in turn is œ used to sort n θ(log n)-bit numbers optimally on an EREW model. The model of computation used is the EREW Reconfigurable PRAM (R-PRAM) that permits the use of “very small” processors. The main result of this report is a parallel EREW R-PRAM algorithm that sorts n θ(log n)-bit numbers in θ(log n) time with θ(n log n) “work”. The proposed algorithm is asymptotically optimal in time and efficiency. If a weaker variant of the R-PRAM …