Digital Commons Network^™

An Evaluation Of Schedule Metrics Used Within Aeronautical Systems Center, Robert J. Hayes, Lawrence M. Miller

Theses and Dissertations

This study focused on a selected group of schedule metrics in use at Aeronautical Systems Center (ASC) acquisition program offices. Over 300 metrics were collected from the System Program Offices (SPOs). The metrics data were sorted into the categories of cost, schedule, and performance. In order to narrow the scope of the project, the team decided to focus on schedule metrics. Seven of the most common schedule metrics were selected for evaluation by a group of five experienced acquisition professionals. The group was asked to input the likely behaviors driven by the metrics being addressed by the study. Next, they …

Range Scheduling Automation For The Air Force Satellite Control Network: A Case Study In Computer System Development, Donald J. Aitken, Steven C. Bishop

Theses and Dissertations

This study explored the factors influencing divergent outcomes of two computer system development efforts which were undertaken to fulfill the same requirement for computer automation of a manual resource scheduling process. The first project employed the traditional waterfall approach to system development, but resulted in user rejection and cancellation after considerable resources and effort had been expended. The second project employed prototyping and both the process and the product were well received by the users and ultimately produced an operational system. Analysis yielded eight contributory factors to the failure of the first effort. Three of these were related to the …

Comparison Of Four-Cursor Buttons Vs Joystick To Access Computerized Technical Information From An Integrated Maintenance Information System, Gerald E. Streff, Robert H. Gundel

Theses and Dissertations

The purpose of this thesis was to evaluate the use of four-cursor buttons versus a joystick device to present technical order information on a portable maintenance aid computer for aircraft technicians in a maintenance environment. Studies to date have verified the superiority of computer-presented technical orders when compared to current paper-based systems; this research investigated the effectiveness of these computer-based systems when technicians used a joystick or four-cursor button to display desired technical information. A comparison was made as to technician performance using a portable maintenance aid at the 4950th Test Wing, WPAFB OH. A total of thirty-two maintenance technicians …

An Assessment Of Afit Sys200, 'Acquisition Planning And Analysis', As A Broadening Course Under Apdp, Daryl J. Hauck, Charles A. Manship

Theses and Dissertations

This study assessed AFIT's SYS200 course, 'Acquisition Planning and Analysis,' to determine whether it serves adequately as a broadening course under the Acquisition Professional Development Program (APDP). APDP certification requires persons in eight acquisition functional disciplines (Acquisition Logistics, Systems R and D/ Engineering, Program Management, etc.) to complete SYS200. Three complementary measures (assessing knowledge, self- efficacy, and a supervisor assessment) were used to determine whether SYS200 conveyed its curriculum effectively to members of all functional disciplines. The results showed that SYS200 attendance produced substantial increases in acquisition-related knowledge, self-efficacy, and supervisor assessments for all functional disciplines. In all three measures, …

Bs News

Building Services Engineering

No abstract provided.

Output Frequency Changes In A Commercial Rubidium Clock Resulting From Magnetic Field And Microwave Power Variations, Edward B. Sarosy

Theses and Dissertations

This report shows the relationship between output frequency shifts and the absorption cell magnetic field during microwave power fluctuations on a commercial rubidium frequency clock. Changes in the clock output frequency relative to the 10 MHz reference were monitored as changes in the absorption cell magnetic field (0.01 to 1.0 Gauss) and changes in the cell's interrogation microwave power were varied from the nominal specification (PO) at four discrete values (+1.3. -1.1, -2.2, -4.OdB). The maximum normalized output frequency shift of 1.4x10^-10 occurred at--4dB. The maximum normalized frequency change for the +1.3 and -1.1 dB data is about 3 …

Analysis Of Standard Type Unit Development, Jeffrey M. Hess, Merry D. Wermund

Theses and Dissertations

This research study examined the standard type unit development process for the Air Force. Current standard type unit development procedures were determined by a literature review. The literature review, with the interviews, provided information regarding the history of, purpose for, and possible alternatives for developing standard type units. A Delphi questionnaire was developed to determine how well the current process works, how standard type units worked for Desert Shield/Storm, and possible ways to improve the development process. This questionnaire was distributed to F-15 units, F-16 units, and major command personnel in Tactical Air Command (now Air Combat Command). All three …

A Comparison Of Aircraft Maintenance Organizational Structures, Wesley C. Davis, Sanford Walker

Theses and Dissertations

This study compares the aircraft maintenance structure being implemented by General Merrill A. McPeak with that of the previous structure typified by TACR 66-5. Historical aircraft data is used to compare organizational structures. Data from the USAF and USN is used to build regression models to determine if organizational structure contributes to combat capability. Statistical tests are used to determine if a significant difference exists between the two organizational structures. Regression analysis and comparison of the results lead the researchers to conclude that a significant difference exists in the performance measures of COMO and Objective Wing organizations. While many reasons …

Modification, Reimplementation And Studies Using The Meisner Model Of The Heart, Ari Zvi Zivotofsky

Theses

The study of left ventricular filling in both the normal and the pathological heart is of great importance. A computer model simulation of the heart with emphasis on mitral flow was designed by Meisner in 1986 and implemented in QuickBASIC. This paper discusses how the original program was altered to be able to perform "Parameter vs. Parameter" runs in which it can be observed how varying an input parameter affects output parameters. The output data is then formatted in such a way that it can be used by QUATTRO PRO, a standard spreadsheet package, to yield graphical outputs.

In addition, …

Remote Driving With Reduced Bandwidth Communication, Fred W. Depiero, Timothy E. Noell, Timothy F. Gee

Electrical Engineering

Oak Ridge National Laboratory has developed a real-time video transmission system for low-bandwidth remote operations. The system supports both continuous transmission of video for remote driving and progressive transmission of still images. Inherent in the system design is a spatiotemporal limitation to the effects of channel errors. The average data rate of the system is 64,000 bits/s, a compression of approximately 1000:1 for the black and white National Television Standard Code video. The image quality of the transmissions is maintained at a level that supports teleoperation of a high-mobility multipurpose wheeled vehicle at speeds up to 15 mph on a …

34th Rocky Mountain Conference On Applied Spectroscopy

Rocky Mountain Conference on Magnetic Resonance

Program and registration information for the 34th annual meeting of the Rocky Mountain Conference on Applied Spectroscopy, co-sponsored by the Colorado Section of the American Chemical Society and the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 2-6, 1992.

Acuta Enews August 1992, Vol. 21, No. 8

ACUTA Newsletters

In This Issue

FCC gives nod to touch-tone video

President's column

West Chester starting student resale

Security at Yale

ACUTA Calender

Phone taps snare hackers

Design And Performance Of A Bituminous Surface Mixture Containing Bottom Ash Aggregate, David Q. Hunsucker

Kentucky Transportation Center Research Report

A one-mile experimental bituminous surface overlay was placed in October 1987 on State Route 3 in Lawrence County, Kentucky. The experimental section utilized bottom ash aggregate from the Kentucky Power Company's Big Sandy Power Plant, near Louisa, Kentucky. Bottom ashes are generally angular and have very porous surfaces. Approximately 539 tons of the experimental bituminous surface material, containing 40 percent bottom ash (dry weight), were placed. Reported herein are results of laboratory tests and performance evaluations of the experimental surface mixture.

Performance of the experimental bottom ash surface has been excellent. Skid resistance tests indicate the surface is highly skid …

Review: 'Theory Of Dielectric Optical Waveguides,' 2nd Edition, By Dietrich Marcuse, Bradley D. Duncan

Electro-Optics and Photonics Faculty Publications

I suppose I ought to say up front that while preparing this review I often found myself feeling very much like a student evaluating his teacher. After all, it was, in part, the first edition of Dietrich Marcuse's Theory of Dielectric Optical Waveguides (among a handful of other similar texts) from which I first studied the principles of optical waveguide theory under the demanding, yet patient and graceful guidance of Dr. Ahmad Safaai-Jazi. Thus with the utmost respect for a teacher whom I have never met, I shall try to faithfully share my thoughts and feelings regarding the second edition …

Acuta Enews July 1992, Vol. 21, No. 7

ACUTA Newsletters

In This Issue

President's column

Two Region Directors elected

Party Line

Northeast Region meeting

Santa Clara Magazine, Volume 34 Number 4, Summer 1992, Santa Clara University

Santa Clara Magazine

12 - SQUEEZING THE MIDDLE CLASS Gone, in the face of staggering recessionary losses, is the peace of mind that once seemed the virtual birthright of the middle class. By Elizabeth Fernandez '79

18 - A FRAGILE PEACE El Salvador shows a ravaged but hopeful face to a delegation from SCU, Stanford, and the Diocese of San Jose. By Thomas Shanks, S.J.

24 - IT TAKES TEAMWORK Facing fierce global competition, more and more U.S. companies are exploring work teams. By Lisa Agrimonti '87

28 - GIVING TO SANTA CLARA: IT RUNS IN THE FAMILY A tradition of giving and …

Discourse-Level Analysis Of Abstracts For Information Retrieval: A Probabilistic Approach, Robert N. Oddy

School of Information Studies - Faculty Scholarship

The objective of this research is to contribute to our knowledge of how people seek information, and how computer systems can be designed to help in this process. Most information retrieval research since the field emerged in the 1950's has reduced these questions to that of trying to determine how documents relevant to a user's query might be selected from a large collection of texts---a question that has proved remarkably difficult to answer. The present work takes the stance that this particular reduction increasingly limits progress towards the objective stated above. It is directed instead towards the development of a …

Impulse, Cindy Price, Julianne Trautmann, Steve Poessnecker

Impulse (Jerome J. Lohr College of Engineering Publication)

Features:
[Page 2] InterActive, a multimedia leader with plans to grow
[Page 4] SDSU/lnterActive link producing new voice command system
[Page 5] South Dakota climate nurtures life
[Page 7] Dakota Mobile Hydraulics continues to expand
[Page 8] Special Teams president puts SDSU minor to good use
[Page 10] Eleanor Baum: challenges for women in engineering
[Page 12] Crossman, Borhard named 1992 Distinguished Engineers
[Page 13] 1992 Engineering Exploration Days includes inventors' congress
Departments:
Faculty:
[Page 14] SDSU chosen for NASA JOVE project
[Page 16] Retiring professor to run for legislature, finish book on family history
[Page 17] University/Industry Technology Service …

Analysis Of Multifrequency Dispersive Optical Bistability And Switching In Nonlinear Ring Cavities With Large Medium-Response Times, Pawel Pliszka, Partha P. Banerjee

Electrical and Computer Engineering Faculty Publications

Using a simple model of a ring cavity comprising a cubically nonlinear medium, we analyze dispersive optical bistability in the presence of more than one spectral component. We show the phenomenon of so-called competition for resonance. In addition to presenting cavity characteristics for the cases of two and three different frequencies, we also discuss the general method for finding steady-state solutions and checking their stability. A simple and efficient algorithm, based on a relaxation method, is devised to find steady-state solutions satisfying appropriate boundary conditions. The relaxation dynamics is physically related to a finite response time of the medium.

Mechanical Backup Systems For Electronic Environmental Controllers, Richard S. Gates, Douglas G. Overhults, Larry W. Turner

Biosystems and Agricultural Engineering Faculty Publications

A series of mechanical backup systems for electronic environmental controllers is presented for a typical finishing swine barn and a typical tunnel ventilated broiler house. The systems consist of mechanical thermostats and timers used in parallel with the electronic controller, designed to ensure animal survival in the event of controller or related hardware failure. For swine housing, three distinct mechanical backup functions are identified; for broiler housing, four distinct mechanical backup functions are identified. Schematic diagrams of the mechanical backup functions are provided and their implementation is described.

A Novel Technique For Deep Level Characterization Of High-Resistivity Semiconductor Materials, Sridhar Panigrahi

Electrical & Computer Engineering Theses & Dissertations

An improved photo induced current transient spectroscopy (PICTS) technique is developed for studying deep level parameters in high-resistivity semiconductor materials. A new digital data acquisition approach and improvement in the cryogenics of the system have enabled us, for the first time in our laboratory, to detect CuA level in a copper doped silicon compensated gallium arsenide (GaAs:Si:Cu) sample. The digital approach improves both the signal to noise ratio (S/N) and the efficiency of the system. Also, multiple PICTS spectra in a single thermal cycle can be obtained. In the present work, various doped and undoped gallium arsenide ( GaAs) and …

Runge-Kutta Upwind Multigrid Multi-Block Three-Dimensional Thin Layer Navier-Stokes Solver, Frank E. Cannizzaro

Mechanical & Aerospace Engineering Theses & Dissertations

A state-of-the-art computer code has been developed that incorporates a modified Runge-Kutta time integration scheme, Upwind numerical techniques, Multigrid acceleration, and Multi-block capabilities (RUMM). A three-dimensional thin-layer formulation of the Navier-Stokes equations is employed. For turbulent flow cases, the Baldwin-Lomax algebraic turbulence model is used. Two different upwind techniques are available, van Leer's flux-vector splitting and Roe's flux-difference splitting. Full approximation multigrid plus implicit residual and corrector smoothing were implemented to enhance the rate of convergence. Multi-block capabilities were developed to provide geometric flexibility. This feature allows the developed computer code to accommodate any grid topology or grid configuration with …

Text-Independent Automatic Speaker Identification Using Partitioned Neural Networks, Laszlo Rudasi

Electrical & Computer Engineering Theses & Dissertations

This dissertation introduces a binary partitioned approach to statistical pattern classification which is applied to talker identification using neural networks. In recent years artificial neural networks have been shown to work exceptionally well for small but difficult pattern classification tasks. However, their application to large tasks (i.e., having more than ten to 20 categories) is limited by a dramatic increase in required training time. The time required to train a single network to perform N-way classification is nearly proportional to the exponential of N. In contrast, the binary partitioned approach requires training times on the order of N². …

An Application Of Neural Networks In Data Communication Real-Time Resource Reallocation, Qing Fan

Electrical & Computer Engineering Theses & Dissertations

This thesis presents an application of artificial neural networks in real-time resource reallocation, a methodology used in the implementation of an intelligent interface node in the Computer Integrated Manufacturing (CIM) environment. In particular, the problem is formulated using a Hopfield neural network model. The real-time reallocation problem is mapped into a two-dimensional matrix of neurons similar to Hopfield and Tank's approach to the traveling salesman problem (TSP) . An energy function is formulated in terms of the hard constraints and the solution cost. The interconnection weights and the input biases are determined by the energy function. It is shown through …

The Rocky Mountain Arsenal: Groundwater Contamination And Clean-Up Activities, Connally E. Mears, Elaine H. Heise

Uncovering the Hidden Resource: Groundwater Law, Hydrology, and Policy in the 1990s (Summer Conference, June 15-17)

26 pages (includes illustrations and map).

Pre-Trial Case Preparation In Complex Groundwater Litigation: The Lawyer’S Role, Michael D. Shimmin

Uncovering the Hidden Resource: Groundwater Law, Hydrology, and Policy in the 1990s (Summer Conference, June 15-17)

12 pages.

Arizona Groundwater Management Act: Recent Issues And Future Prospects, Katharine Jacobs, Robert Glennon

Uncovering the Hidden Resource: Groundwater Law, Hydrology, and Policy in the 1990s (Summer Conference, June 15-17)

26 pages.

Practical Considerations For Effective Use Of Expert Witnesses And Computer Models In Complex Groundwater Litigation, William A. Paddock

Uncovering the Hidden Resource: Groundwater Law, Hydrology, and Policy in the 1990s (Summer Conference, June 15-17)

14 pages.

Acuta Enews June 1992, Vol. 21, No. 6

ACUTA Newsletters

In This Issue

Connectivity, Database Center

President's column

WISE participants

Billed party preference

Keene State gets "slammed"

New Membership Director

Division-Of-Amplitude Photopolarimeter Based On Conical Diffraction From A Metallic Grating, R. M.A. Azzam

Electrical Engineering Faculty Publications

A new photopolarimeter that employs polarization-dependent conical diffraction of light by a metallic grating for the simultaneous measurement of the four Stokes parameters of light is described.