Digital Commons Network^™

Reliability Study Of Liquid Crystal Display, Kalpesh Mahendra Desai

Theses

The purpose of this thesis is to study the reliability of liquid crystal display under different temperature conditions. To accomplish this, accelerated life testing was done on the soft glass and the hard glass liquid crystal display units at 77 C and 85 C temperature without any added humidity or voltage.

As the current is a usefu1 indicator for probable wear of liquid crystal display, leakage current was measured at 0 hour, 1000 hours, 2000 hours and 3000 hours when the units have stabilized at room temperature.

The date shows higher spread for the hard glass units. This may indicate …

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.

A Research Study To Determine The Characteristics And Attitudes Shared By Entrepreneurs And Intrapreneurs And The Similarities And Differences Between Them, Miguel A. Vargas

Theses

The United States of America has been the mecca of many ventures for people with vision, goals and perseverance. The prosperity of our nation has been paved by individuals with great ambition, determination and insight, who have dared to take on a risk in owning a business enterprise.

This research study was conducted to determine the characteristics and attitudes of both entrepreneurs and intrapreneurs, as well as the similarities and differences between them.

For this study, a survey of entrepreneurs.was conducted through the use of questionnaires distributed to business owners located in the counties of Essex, Passaic and Hudson, in …

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 …

Splchk: A Vax/Vms Spelling Checker And Corrector Utilizing A Trie-Structured Dictionary, Roman George Lewyckyj

Theses

This paper presents a "user-friendly" spelling checker and corrector written in C, which utilizes a "trie" structure to store its main dictionary of words, thereby eliminating redundancy of letters. The program allows the user to either check the spelling of words or files, or to correct "misspelled" words in files. The program is designed to operate primarily in a minicomputer environment, such as the VAX/VMS environment.

Micro Computer Animation, Peter Sterling Franks

Theses

Not Included

An Analysis Of Variation In Response Time Of Cpu Scheduling Algorithms As A Function Of Load: A Simulation, John Dehority

Theses

This thesis analyzes a group of cpu scheduling algorithms on the basis of the variation in response time that results from changes in the system load. The results of this study quantify the differential degradation of performance across job categories. The job categories include short-burst interactive jobs as well as cpu intensive jobs. For each job type, measurements were made of average job turn-around time, weighted average turn-around time, and worst case response time. Additional statistics gathered include: ready-to-run queue size, cpu utilization and throughput. The three cpu scheduling algorithms compared are round-robin, shortest-job-first, and a multi-queue priority scheduler. The …

Genre Painting: Personal Significance Of The Environment, Leslie Loving

Theses

Not Included

The Contributions Of Linn Boyd Benton And Morris Fuller Benton To The Technology Of Typesetting And Typeface Design, Patricia Cost

Theses

The relative obscurity of Linn Boyd Benton and Morris Fuller Benton, is investigated. The two men, father and son, made significant contributions to the technology of typesetting and to typeface design, yet they are not now well known in the industry. Linn Boyd Benton invented a pantographic punch-cutting machine, which he later modified to engrave matrices. This machine made the Linotype machine practical, since it took the tedium and great expense out of the making of Linotype 'mats.' Benton's machine was and still is used at the American Type Founders Company, and was copied for use at type founding companies …

Pmos Digital Structures, Robert Pearson

Theses

A majority of new integrated circuit designs are being fabricated in CMOS technology which uses both pMOSFETs and nMOSFETS. The nMOSFETS have been well characterized over the past few years whereas the pMOSFETs have been ignored since MOS technology moved to nMOS in the early 70 's. Investigation of pMOS devices will provide information that will be useful for other technologies such as CMOS. This paper looks at the design, fabrication, fabrication simulation, electrical characterization, electrical simulation and testing of digital pMOSFET circuits. A particular emphasis will be placed on understanding the process so that first time integrated circuit processors …

Leading The Electronics Industry Into Total Automation, George P. Rossi

Theses

The introduction of an automated PCB facility in today's technological society still includes a people-oriented facility. The main thrust should be to develop Artificial Intelligence, then the incorporation of LANS, CAD, ICAM, and CIM.

The ability to lace all the functions together is by far the biggest obstacle. The hardware of the equipment is not so much the obstacle to the chemical process and knowledge as the software. Software, which is the capability to talk from the computer to the equipment, is the greatest stumbling block because there is no standardization in the language format.

The method which a computer …

American Studies: Civil War, The Correlation Of Literature And History Studies In High School, Arlene Kellogg

Theses

Courses in history can be nothing but memorizing facts, and courses in literature can be writing without roots . The author proposes a correlated curriculum for high school American literature and history, specifically in the Civil War time frame to change this situation.

The purpose of this curriculum, "American Studies: Civil War," is to make the history of our country live for the student, giving him/her a feeling for the mood of the times and motivating him/her to become politically active as a young citizen.

To validate the proposal, the author has interviewed experts in the fields of literature, history …

Analysis Of Compliant Pins Subjected To Plastic Deformation, Lincoln Miller

Theses

An experimental/numerical analysis of two types of compliant pins is presented: dynamic retention pins and cantilever pins. It is shown that there is a trade-off between the performances of both types of pins. For the same range of retention force, the cantilever pin, with a smaller stiffness, is more forgiving and gives a broader range of deflection. The dynamic retention pin is shown to be more reliable with time and replacement frequency, since it exhibits less plastic deformation for the same range of retention force.

Imaging Land/Water Demarcation Lines For Coastal Mapping, Kirk Smedley

Theses

The objective of this research has been to improve upon the imaging methods currently used by the Photogrammetry Branch of the National Oceanic and Atmospheric Administration, for locating coastal boundaries. In keeping with this objective, a near-infrared radiometer/exposure meter has been developed and constructed. This device gives f -number and shutter speed values for a given scene radiance in the near-infrared region, and the aerial camera may then be set at these values for proper exposure. As an addendum to the research, a simple image processing technique, color ratioing, has been applied to demarcation photography with extremely promising results. Using …

Elementary Art Education Curriculum: The Incorporation Of The Computers In The Art Room, Camille Deni

Theses

Not Included

Robotic Quick Change End Effector System, William Craig

Theses

A quick change end effector (QCEE) system was developed and tested on a GMF model A-l robot. The QCEE allows for the automatic interconnection of up to three independent pneumatic channels for gripper actuation. The QCEE was designed for a maximum payload of 15 lb. and weighs approximately 5.4 lbs. The system was tested using pneumatic grippers for pick and place operations, and functioned well in a simulated manufacturing environment.

Black & White Continuous Tone Printing Using Multiple Negative Working Plates, So That Each Plate Prints An Equal Segment Of A Determined Density Range, Frank C. Forti

Theses

Continuous tone printing, either collotype or screenless lithography, are processes that are in limited use. The halftone method of reproduction is still the most economical way to reproduce a continuous tone original. This study dealt with the mechanism of screenless lithography, more specifically on how to make the use of negative working plates a feasible alternative to positive working plates. It is known that the positive working plate can print a longer range of tones than a negative working plate. So the main point of the experiment dealt with how to extend the range of a negative working plate. A …

Determining And Producing An Optimum Photographic Print For Photomechanical Reproduction, Terri L. Romanik

Theses

This research has explored the possibility of determining the optimum black and white photographic print characteristics for paper surface, image color, and contrast to achieve optimum reproduction from that original for a given set of printing press conditions utilizing single impression offset lithography.

A random population of 101 observers evaluated the reproduction of eighteen different photographic prints of the same subject from the identical film negative. The prints varied in contrast grades from grade one to grade three; in image color from warm black to neutral black to cool black; in surface characteristics from glossy to semi-lustre to matte; and …

Emulsification Rate Of Sheet-Fed Offset Ink And Its Effect On Printed Quality, Qingyi Chen

Theses

This thesis is a study of Surland's Emulsification Method, and is intended to demonstrate the effect of change in emulsification rate curve with different types of fountain solution whose surface tension was varied. The surface tension of a fountain solution can be changed by the addition of isopropyl alcohol. Two inks were modified to produce the same tack reading but a different emulsification capacity. Using the Surland method the two inks and two fountain solutions generate four different emulsification rate curves and these four curves are tested for their effect on printed quality. The printing performance of an ink is …

Against The Wall, Arthur Hynes

Theses

None provided.

Design Of An Expert System To Perform Cladistic Analysis, Walter Wolf

Theses

Not Included

The Relationship Between Average Color Difference And 3-Channel Colorimetric Quality Factor For A Simple Additive Color System, Stefan Pabst

Theses

Neugebauer's Colorimetric Quality Factor for a simple additive color reproduction system is calculated for 17 detector response functions. Each response function is used to simulate the reproduction of 124 colors and 774 metameric grays. The mean color difference between original and reproduced colors is calculated for colors and metamers for each detector response. The relationship between mean color difference and colorimetric Quality factor is studied.

Computer Vision Of A Moving Square Using A Two-Level Data Hierarchy, David Zokaites

Theses

An investigation of the relative speed and effectiveness of two computer vision algorithms has been conducted. One algorithm incorporates a two-level data hierarchy. The other incorporates a one-level hierarchy and serves as a relatively conventional basis for comparison. The computer vision algorithms, programmed in Fortran, detect and recognize a moving square. Both computer vision algorithms could readily be implemented in existing hardware. The two-level algorithm was found to be up to 90% faster than the one-level algorithm. An analysis was made of elapsed CPU time variance as a function of time of day and user load. This was done to …

Computer Assisted Instruction For Students Studying Basic Logic At The 9th Grade Level, Edith Shortt

Theses

A system of Computer Assisted Instruction for Students Studying Basic Logic at the 9th Grade Level was written in Prolog running on a Digital Equipment Vax 11/780 under the Unix1 operating system. The program is a straight-forward approach to teaching propositional logic. A three layer menu structure is used to inform students of lessons, subtopics, and help available. Example questions are generated after each subtopic, and student scores are displayed for immediate reinforcement or correction. Scores are also saved for storage on the student's progress chart file. A help function enables the student to review explanations of terminolgy, review truth …

Spectrophotometric Studies Of Individual Components Of A Cupric Chloride Etchant Used In Printed Wiring Board Manufacturing Processes, Christine Mee

Theses

A study was performed to develop an accurate, on-line method of determining the cuprous chloride concentration in a typical cupric chloride etcher. A technique was developed using the slope between two spectrophotometric absorption points produced by scanning a solution sample. An on-line monitor was developed to produce a faster and more accurate method of solution concentration control for a typical cupric chloride etching solution. Slope increased linearly with increasing cuprous concentration when the 535 and 560 nanometer bandwidth filter combination was used. Monitor accuracy was found to be independent of cupric concentration, hydrochloric acid concentration, and temperature over the cuprous …

Evaluation Of Flash And Fluorescent Sources With Respect To Recommended Ocular Exposure Thresholds, Mark Fairchild

Theses

A system was established for the evaluation of sources of optical radiation with respect to recommended ocular exposure limits. This system consists of a diode array radiometer calibrated for absolute radiometric measurements and software for the application of the currently accepted threshold limits for exposure to the various wavelengths of radiation. Absolute calibration of the array radiometer was accomplished to within 3 percent of values obtained by a conventional instrument. Day-to-day repeatability of the instrument indicates the possiblility of absolute calibration of the detector array responsivity for everyday use in the measurement of continuous sources to an accuracy of plus-or-minus …

Attributes Of Fault-Tolerant Distributed File Systems, Frank Goetz

Theses

Fault tolerance in distributed file systems will be investigated by analyzing recovery techniques and concepts implemented within the following models of distributed systems: pool-processor model and user-server model. The research presented provides an overview of fault tolerance characteristics and mechanisms within current implementations and summarizes future directions for fault tolerant distributed file systems.

The Eroticism Of Presence (Allusion To The Essence Of An Object), Eric Mosher

Theses

None provided.

Distributed File Systems For Unix, Edward Ford

Theses

With the advent of distributed systems, mechanisms that support efficient resource sharing are necessary to exploit a distributed architecture. One of the key resources UNIX provides is a hierarchical file system. Early efforts supported distributed UNIX systems by copying files and sending mail between individual machines. The desire to provide transparent mechanisms on which distributed systems access resources has propelled the development of distributed file systems. This thesis presents a brief history of the development of distributed systems based on UNIX, and surveys recent implementations of distributed file systems based on UNIX. The IBIS distributed file system is an example …

Computer Application Of Project Planning And Scheduling With Cpm, Mohamed Tarek Abdel-Aziz

Theses

Scheduling is one of the most important tools for project management and control, and the CPM is one of the techniques used in project scheduling.

The primary objective of this thesis is to develop a CPM computer package using a microcomputer. The package is constituted in Basic (Applesoft Basic) for use on Apple II Plus, IIe or IIc.

The package is intended to be available to users without sufficient knowledge about computer. And it consists of two computer programs. The first computer program is the CPM-I which schedules project activities with unlimited resources. The second computer program is the CPM-II …