Digital Commons Network^™

A Multipurpose Test Mask For Exposure Tool Characterization, Brian Benamati

Theses

Of the many facets of integrated circuit fabrication, photolithography may very well be the most important due to the number of levels required for the fabrication of sophisticated devices. Therefore it is imperative to understand the performance capabilities of an exposure tool and identify its inherent limitations. Many methods have been developed which concentrate specifically on evaluating resolution, critical dimensions or registration. Often test patterns exist which vary widely for applications with respect to steppers, IX scanning projection aligners and other IX exposure equipment. The following work is focused on the requirements of evaluating and optimizing all aspects of performance …

A Comparison Of The Collinear Mean And The Mean Sea Surface As Reference Levels For Altimeter Analysis In The Southern Pacific Ocean, Charles Beard

Theses

Satellites are used to study various oceanic phenomena, including sea surface temperature, color, and sea height variability (which is related to oceanic currents). In observing sea height variability from radar altimeters, three methods of analysis can be applied. They are the collinear or repeat track method, the cross-over difference method, and the mean sea surface method. All three are designed to remove the effects of geoid undulations from the altimeter records. This paper compares the collinear method with the mean sea surface method in a small geographic area. Both methods analyze the tracks of collinear altimeter data by subtracting a …

On The Proposed Integrated Services Digital Network, Robert Johnson

Theses

The ultimate aim of this dissertation is neither to increase the state of the art in networking technology nor to predict the future structure of telecommunications networks. It is an attempt to raise the awareness of both the author and the reader as to the evolutionary forces driving vast changes in the telecommunications field. The impact of these changes will significantly alter the way we live and conduct business in the Information Age. For those involved with the communications field, the ability to make sound business decisions will require an in-depth knowledge of the technology and services that compose ISDN. …

An Introduction Of The Theory Of Nonlinear Error-Correcting Codes, Robert B. Nenno

Theses

Nonlinear error-correcting codes are the topic of this thesis. As a class of codes, it has been investigated far less than the class of linear error-correcting codes. While the latter have many practical advantages, it the former that contain the optimal error-correcting codes. In this project the theory (with illustrative examples) of currently known nonlinear codes is presented. Many definitions and theorems (often with their proofs) are presented thus providing the reader with the opportunity to experience the necessary level of mathematical rigor for good understanding of the subject. Also, the examples will give the reader the additional benefit of …

Integrated Voice/Data Through A Digital Pbx, Ian Schofield

Theses

The digital voice/data PBX is finally reaching its anticipated potential and becoming a major factor when considering the total communications picture for many businesses today. The digital PBX has always been the choice for voice communications but has lagged behind the LAN industry when it comes to data transfers. The pendulum has begun to swing with the enhanced data capabilities of third and fourth generation PBXs. The battle for the total communication market is quite fierce between the LAN and PBX vendors now. This research thesis looks at the history, evolution, and architecture of voice/data PBXs. It traces development of …

A Tool For Compiler Testing, Chung-Cho Oliver Cheng

Theses

A tool for compiler testing is implemented. The tool is driven by a BNF grammar extended by a device called control flags to incorporate those parts of a language that are not controlled by context-free rules (for instance, use of declared names). The tool produced two sets of program strings such that each production in the grammar is used at least once. One set is produced by Purdom's algorithm. The other is produced by a new algorithm designed by the author which builds a tree and then produces a set of strings from it for compiler testing. The program strings …

A Toolkit For Uncertainty Reasoning And Representation Using Fuzzy Set Theory In Prolog Expert Systems, Marcelle M. Bicker

Theses

This thesis examines the issue of uncertainty reasoning and representation in expert systems. Uncertainty and expert systems are defined. The value of uncertainty in expert systems as an approximation of human reasoning is stressed. Five alternative methods of dealing with uncertainty are explored. These include Bayesian probabilities, Mycin confirmation theory, fuzzy set theory, Dempster-Shafer's theory of evidence and a theory of endorsements. A toolkit to apply uncertainty processing in PROLOG expert systems is developed using fuzzy set theory as the basis for uncertainty reasoning and representation. The concepts of fuzzy logic and approximate reasoning are utilized in the implementation. The …

Teraphim: A Domain-Independent Framework For Constructing Blackboard-Controlled, Blackboard-Based Expert Systems In Prolog, Bruce Lyon

Theses

The blackboard architecture, in which a set of independent knowledge sources communicate by means of a global data base known as a blackboard, has been suggested as a generally useful design for knowledge-based systems. Teraphim is a domain-independent frame work for writing blackboard-based expert systems in Prolog. It implements concepts common to a range of previous blackboard architecture programs, such as HEARSAY-III and BB1. Teraphim includes as its basic elements a partitioned blackboard, a simple blackboard-controlled scheduler, a set of general-purpose scheduling heuristics to control the scheduler, a generic knowledge source with the ability to ask the user questions about …

A Computer Simulation Of Processor Scheduling In Unix 4.2bsd, Michael D. Grossman

Theses

This project is a study of the processor scheduling system in UNIX 4.2BSD. This study involved a computer simulation of the processor scheduling system. The preliminary work for the simulation included choosing a system, choosing and running a set of test processes on that system, gathering statistics from these runs, and constructing a model of the scheduling system. The model was then tuned to perform like the real system by introducing overhead into the model. The overhead was added using several variables in the model. Tuning consisted of adjusting the values of these variables until the performance of the model …

A Simulation Of A Distributed File System, Alan Stanley

Theses

This thesis presents a simulation of a distributed file system. It is a simplified version of the distributed file system found in the LOCUS distributed operating system. The simulation models a network of multiuser computers of any configuration. The number of sites in the network can range from a minimum of three sites to a maximum of twenty. A simple database management system is supported that allows the creation of an indexed database for reading and updating records. The distributed file system supports a transaction mechanism, record level locking, file replication and update propagation, and network transparency. To test the …

Implementing Intersection Calculations Of The Ray Tracing Algorithm With Systolic Arrays, Andrea Stankus

Theses

Ray tracing is one technique that has been used to synthesize realistic images with a computer. Unfortunately, this technique, when implemented in software, is slow and expensive. The trend in computer graphics has been toward the use of special purpose hardware, to speed up the calculations, and, hence, the generation of the synthesized image. This paper describes the design and the operation of a systolic based architecture, tailored to speed up the intersection calculations, that must be performed as a part of the ray tracing algorithm.

Display Of Molecular Models With Interactive Computer Graphics, Steve Wuter Yang

Theses

Computer graphics devices offer a way to present images of three-dimensional objects with enough detail to aid human understanding of the structure of molecules. In this thesis, the Computer Aided Molecular Design system (CAMD system) will illustrate this idea. The CAMD system is an educational package designed for students in high school. The user of the CAMD system can create different molecules and store these molecules into a relational data base for future display. A Relational Data Base Management system was implicitly implemented for the CAMD system.

Development Of A Composite Material With Enhanced Electromagnetic Power Dissipation Characteristics, Lawrence R. Egan

Theses

The present work was undertaken to enhance the productivity of manufacturing operations that involve heating materials by increasing the possibilities for electromagnetic heat processing of materials. The approach taken was to design a composite material with suitable mixture formulae to have prescribed electromagnetic loss characteristics.

Investigation began by surveying industrial uses of electro-magnetic energy in heat processing of materials. From applications, the survey shifted to electromagnetic properties of materials with focus upon dielectric properties of materials. Several techniques were considered for altering the dielectric properties of a lossless plastic and the approach chosen was to dilute the base plastic with …

A Study Of The Application Of Paper Spread Function Data To The Prediction Of Physical Dot Areas For Offset Lithography, Paul Lewis

Theses

This investigation was aimed at establishing a relationship between the optical spread function of four common printing stocks (cast coat, enamel gloss, enamel dull and ledger) and a Yule - Neilsen n value in predicting physical dot Area, for offset lithographic printing. Using an offset press each paper stock was printed with a test target containing common screen frequencies at percent dot areas from 5-90"/. and solid ink patches adjacent to each tint. Using planimetry and macrodensitometry, exact n values were calculated for comparison with the measured spread function of that same paper stock. No relationship between the optical spread …

A Cost And Performance Analysis Of The Three Electronic Communication Systems Currently In Use In The Printing And Publishing Industry, Susan Richards

Theses

This study describes and evaluates the three electronic graphic communication systems presently used by the printing and publishing industry. The author has selected generic system names for each of the systems. These are: System 1: Page Facsimile System 2: Character-Encoding System 3: Pixel Density-Map Page Facsimile systems are primarily used by newspaper publishers. The Character-Encoding and Pixel Density-Map systems are alternate methods primarily used by newsweekly magazine publishers. All three communication systems offer the user a means of transmitting editorial, and in some cases advertising pages, to remote printing facilities for manufacturing and distribution. Each electronic graphic communication system is …

An Exploration Of Triarylmethane Leucohydroxides, Mahin Sadrai

Theses

To explore the possibilities of the potential use of photochromism of triarylmethane leucohydroxides and leucobisulfites , five leucohydroxides (see Table [5]) and five leucobisulfites were synthesized and two leucohydroxides and one leucobisulfite were investigated in a variety of solvents with different Brownstein Coefficients. Malachite green leucohydroxide and crystal violet leucohydroxide showed opposite behavior in the same basic solutions, while both of them were dramati cally affected by the change in solutions basicity. Photodegradation induced by repeated exposure (fatigue) manifested itself in the form of lower photo -induced optical density, with a constant halflife in malachite green leucohydroxide and in the …

Comparative Study Of Networks Using Packet And Circuit Switching Within A Single Network, Suman Sharma

Theses

During the last couple of years, in addition to voice, other types of communications network services are becoming increasingly important. These are interactive data, facsimile, slow scan image, and bulk data. Typically, these services are delivered by separate networks using various kinds of switching technology, such as packet, circuit, or message switching. Recently, much of the focus has been on the integration of all types of communication services within the same switch or network, especially within the telephony and business industry. Integration of the communication services is being realized by integrating packet and circuit switching within the same switch or …

The Development Of A Modular Poster Design, Paul Hamilton Neville

Theses

None provided.

Image Motion Compensation For An Electronic Imaging System, James H. Cain

Theses

The design of an image compensation device is given which is capable of minimizing the in-track image disturbances caused by velocity variations in an optical scanning device. Guidelines for the development of this mechanism are based on known optical principles. Acceptable response capabilities for this device are based on subjective and quantitative image quality standards. A first order analysis of the device was conducted to specify the performance required to minimize the distortions mentioned above. The final system specifications take into account actual hardware that is currently available for the typical scanner system presented.

A Detailed Measure Of Apparent Modulation Induced By Cornsweet Edges On A Digital Image Display System, Jeff Pelz

Theses

A digital image display based system was designed and implemented to perform visual measurements of apparent modulation induced by the Cornsweet illusion. The system was used to examine the results reported on previous experiments designed to measure the modulation transfer function of the human visual system. The reported results of experiments performed by Dooley and Greenfield on induced modulation were examined, and data not reported in that work was collected on the range of modulations over which observers perceived linear images. The system developed has the flexibility to be adapted for many different types of experiments. Visual experiments involving human …

A Comparison Of Two Computer Graphic Systems, Andrew L. Mayer

Theses

None provided.

The Biochemical Fuel Cell : Conversion Of Waste To Energy, Charles August Mielke

Theses

A batch biochemical-fuel cell was constructed and studies on the production of bioelectric energy using an alga Scenesdesmus quadricauda, and a bacterium Desulfovibrio desulfuricans, were conducted. Results were compared for a steady state cell using various concentrations of media components and showed that a 1000-fold increase in the concentration of media components produced a net potential output of 0.03mv/ml compared to an initial output of 0.02mv/ml. Further studies showed the biochemical net potential output using activated sludge from a waste treatment facility was 0.01mv/ml compared to 0.02mv/ml for the cell using the initial media concentration.

The system exhibited steady state …

An Investigation Of The Applicability Of Walker And Fetsko Ink Transfer Equation On And The Influence Of Ink Viscosity On Heat Set Ink Used On The Web Offset Process, Dein Wang

Theses

The Walker and Fetsko ink transfer equation is the most used ink transfer equation to predict the ink and paper behavior on the ink transfer step in the printing process. All previous studies have shown that this equation is mostly applicable in the three major printing processes, letterpress, lithography and gravure. A study by Schaeffer, Fisch and Zettlemoyer reported extensive measurements for several oil-base ink and paper combination over a range of proof-press printing conditions. Yuri Bery did a series of studies for modifying the Walker and Fetsko equation in gravure inks for Weyerhaeuser Company. All the studies showed that …

A Study On The Relationship Of Dark Reaction Of Diazo And Photopolymer Presensitized, Negative Working, Lithographic Plates With Temperature Relative Humidity, And Time, Kannan Adityan

Theses

Dark reaction is a condition in which the plate acts as if it is exposed to a low level of active light, even though it is being stored in the dark. The Stouffer scale or the sensitivity guide is used to measure this dark reaction which takes place also as a result of high temperature and relative humidity. If there is much dark reaction taking place, more solid steps will show up on a negative working plate. For the purpose of this experiment diazo and photopolymer presensitised, negative working, lithographic plates were chosen. These plates were cut into small sections …

The Effect Of The Relief Plate Shoulder Angle On Flexographic Dot Gain, Bruce Brier

Theses

The mechanism of image-formation in photopolymer flexographic relief printing plates is reviewed. In addition to the identified factors, it was hypothesized that the level of exposure could influence the plate shoulder angle. It was further hypothesized that an optimization of shoulder angle with respect to halftone dot area may reduce the dot gain of the printing process. An experiment was conducted using a novel method of plate exposure. Continuous-tone masks were placed in contact with the plate back and the halftone negative used on the plate face. The resulting shoulder angles were measured and analyzed for significant fit to a …

Mythography, Christopher Losee

Theses

Although it was written over a year before this section, the thesis proposal which appends this report still serves as a good introduction to my ideas on myth in general , and in particular to my way of thinking when I began this inquiry into the photographic representation of myth. In exploring the visual and artistic dimensions of myth, I found that my thoughts and feelings on the subject changed vastly as the work progressed; however, the end result of this process of exploration has led me back to the beginnings of the work and allowed me, as T,S. Eliot …

Measurement Of The Spectral And Spatial Responses Of The Human Eye's Blue Sensitive System And The Effects Of Lateral Inhibition By The Red And Green Sensitive Systems, Paul Berg

Theses

A study was conducted to measure the change in spatial modulation sensitivity of the human eye's blue sensitive system at low light levels due to color shift, intensity change, and accommodation of red and green sensitive systems with yellow light. A testing device was designed which allowed a wide range of variation in viewing conditions for targets of several spatial frequencies. IV Results indicate that the ability to resolve gratings by the blue cones is depressed by lowering grating intensities but does not depend on wavelength within the blue cone sensitivity envelope to any extent greater than that explained by …

The Challenge Of Functional Art, Janice C. Anthony

Theses

None provided.

Zeta Potential Measurements Of Biological Flocs Using A Streaming Potential Cell, Wayne James Gallagher

Theses

A streaming potential apparatus was assembled and tested. Its purpose was to characterize the surface of biological flocs in a wastewater environment. Samples of mixed liquor were obtained from the Passaic Valley Sewerage Commissioners wastewater treatment plant in Newark, New Jersey. Filtered mixed liquor was passed through a bed of the floc particles in the streaming potential cell, and the electric potential across the cell was measured as a function of the differential pressure drop. From these data, the zeta potential was calculated using the Helmholtz equation. Values of -0.88 and -0.44 millivolts were obtained for two mixed liquor samples.

Mwterm: A Macintosh Based Multiple-Window Unix Workstation, Deshler Armstrong Jr

Theses

MWTerm is a terminal emulator that runs on an Apple Macintosh computer. It provides a multiple window interface in which each window maps to a independent process on the host computer. It is designed to run in conjunction with a cooperating program on the host computer, under the Unix operating system. This paper describes the ideas behind the user interface presented by MWTerm. The implementation of both the Macintosh and the Unix ends is described. A discussion of the lessons learned and future enhancements is provided.