Digital Commons Network^™

Investigation Of Steady Incompressible Flows In The Vicinity Of An Airfoil, Sivaraj Kailasapathy

Theses

O-type body-fitted coordinate systems are numerically generated about NACA0012 and NACA4412 airfoils. These coordinate systems are used to effect a coordinate transformation from the physical plane to a rectangular transformed plane. The software developed also has a coordinate contraction capability. Plots of uncontracted and contracted coordinate systems are presented.

The nonconservative, velocity-pressure formulation of the two-dimensional, steady-state Euler equations are transformed to the rectangular plane. The boundary conditions at the airfoil are determined by the source-panel method, following which, the explicit finite difference form of the transformed Euler equations are solved using a space-marching scheme. Non-lifting potential flow solutions are …

The Ubiquitous B-Tree: Volume Ii, Sally E. Fischbeck

Theses

Major developments relating to the B-tree from early 1979 through the fall of 1986 are presented. This updates the well-known article, "The Ubiquitous B-Tree" by Douglas Comer (Computing Surveys, June 1979). After a basic overview of B and B⁺ trees, recent research is cited as well as descriptions of nine B-tree variants developed since Comer's article. The advantages and disadvantages of each variant over the basic B-tree are emphasized. Also included are a discussion of concurrency control issues in B-trees and a speculation on the future of B-trees.

How A Printer's Marketing Strategy Affects Capital-Equipment Purchasing Decisions, Lisa S. Horwich

Theses

Marketing is a concept that is commonly believed to be the key to achieving organizational goals. This is accomplished through the determination of the needs and wants of potential customers and the deliverance of the product or service that meets this need more effectively and efficiently than any of the company's competitors.

The survey of San Francisco printers demonstrated that while the companies do employ persons in a marketing or pricing capacity, that these individuals do not play a significant role in capital equipment purchasing. Each phase in the procurement process was handled by top management almost exclusively.

The two …

Development Of A Photometric Primary Transfer Standard For Reflectance Goniospectrophotometry, Denis J. O. Daoust

Theses

Currently, photometric standards are calibrated only at CIE-recommended geometries. A need exists for calibrating at many combinations of illumination and viewing angles. The common practice is to assume BaSO₄ is lambertian although its non-Iambertian behavior is well-known. Accordingly, a study was undertaken to develop a standard for this type of metrology. Two diffuse materials, BaSO₄ and PTFE, were characterized goniospectrophotometrically. PTFE, when pressed to a density of 1.55g/cc against a lapping film, exhibited properties lending itself as a transfer standard. Bidirectional absolute spectral reflectance factors at 60 combinations of illumination and viewing angles in a single plane were …

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 …

Countywide Police Simulation System Cops, Craig J. Mcdonald

Theses

COuntywide Police Simulation System (COPS) is a model which simulates the receipt of police, fire, and emergency medical calls at a public safety communications center, with subsequent dispatch of law enforcement officers to police events. The model examines the interaction of exogenous variables, including the type of call, the frequency of calls, the number of telecommunicators on duty, the number of police cars in service, the deployment pattern of the officers, the number of cars to be dispatched, and the dispatch plan. By modifying the values that these variables can hold, the distribution of workload among police officers can be …

Application Of The Dram Software For The Dynamic Analysis Of A Linkage Mechanism, Deepak Namdeo Rode

Theses

The study provides the application of the DRAM software for the dynamic analysis of a linkage mechanism and presents a simplified version of the DRAM user manual. This user manual appears in appendix C. The linkage which is used for the dynamic analysis consists of three rigid couplers. Crank 2 of this mechanism is responsible for transferring motion to the other links. Kinematic and kinetic results by DRAM are compared with analytical results. Good agreement was observed. Since the DRAM user guide is not easy to understand, it was necessary to write a user-friendly guide. Several types of kinematic and …

Characterization Of Monoclonal Antibodies Against Digoxin, Susan K. Alexandrovich

Theses

Five antibodies directed against digoxin were grown and characterized. Two separation techniques were tested to find the better method of separating bound the free fractions of ligand after competitive reactions with the antibodies. Charcoal separation was chosen. The antibodies were analyzed for affinity constant by the Scatchard Analysis. Cross reactivity data for two of the antibodies were collected. Four of the antibodies have satisfactory affinity constants for use in a digoxin assay. Cross reactivity studies showed varying amounts of cross reactivity with digoxin metabolites, but none with the steroids and lipid tested.

An Image Storage System Using A Relational Database Management System To Facilitate Picture Data Handling, Daryl G. Johnson

Theses

The Image Storage System (ISS) is a general purpose graphics facility for the storage and retrieval of pictures. ISS utilizes the capabilities of the Mistress Relational Database Management System, the Relation Interpreter Package and the CORE Graphics Package. The system was developed to illustrate that by utilizing a database system for the storage of the actual picture description, users can incorporate graphics into their applications very simply without becoming a graphics or programming expert. Through the database, image data can be shared between applications and changes or additions to the image will not require program modification. As a consequence of …

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 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.

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 …

Uguru: A Natural Language Unix Consultant, John Hanson

Theses

UGURU is a natural language conversation program, implemented in Prolog, which can manage a wide knowledge base of facts about Unix. The range and wording of questions that it understands are based on surveys taken of students, mostly Unix beginners. UGURU is also designed to accept statements in English that can be added as facts to the knowledge base. Each fact is represented as a "binding set:" a verb-oriented semantic net with the characteristics of directed acyclic graphs. The main actions taken by UGURU are divided between two primary modules, a parser and a retriever. To produce a binding set …

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 …

Signature File Access Methodologies For Text Retrieval: A Literature Review With Additional Test Cases, Karen Caviglia

Theses

Signature files are extremely compressed versions of text files which can be used as access or index files to facilitate searching documents for text strings. These access files, or signatures, are generated by storing "hashed" codes for individual words. Given the possible generation of similar codes in the hashing or storing process, the primary concern in researching signature files is to determine the accuracy of retrieving information. Inaccuracy is always represented by the false signaling of the presence of a text string. Two suggested ways to alter false drop rates are: 1) to determine if either of the two methologies …

Development Of A Mathematical Model To Determine The Temperature Distribution In The Metal Layer And Hearth Of An Electrical Resistance Smelter, Kurt B. Carlson

Theses

A steady-state finite-difference heat transfer mathematical model was derived to determine the temperature distribution in the metal layer and the hearth of a cylindrical electrical-resistance smelter. The temperature distribution is required for the redesign of the refractory materials and their positions in the hearth to insure that the metal layer is kept molten at normal smelting temperatures and that mechanical and structural integrity of the hearth is maintained. An extensive literature search revealed that no previously defined model of this type existed and that consideration of a three-dimensional model was beyond the scope of this work. The literature search also …

Design, Fabrication And Implementation Of A Hash Table Processor, Robert Paul Ketrick

Theses

Hash tables have been used frequently to implement organized data table storage. However, there is a great deal of overhead in executing the hash algorithm every time the table is accessed. Alternatively, a content addressable memory (CAM) is a hardware implementation of an organized data table. A CAM requires very complex hardware design for each memory cell and therefore yeilds a very low cell density on each chip. This requires a large number of expensive chips to implement a large hash table. In this thesis a simple hash function was designed into an integrated circuit using 4- micron NMOS technology. …

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. …

A Domain Specific Expert System Tool For Building Photofinishing Process Diagnostic Systems, King Choi

Theses

The knowledge-based method is a new and useful technique to build computer systems for applications which are heuristic rather than algorithmic in nature. This paper discusses how the approach can be applied to photofinishing process diagnostics. A prototype system for diagnosing Process E-6 for Kodak Ektachrome films is built to understand the knowledge structure and inferencing criteria for photofinishing process. The experience gained from building the prototype Process E-6 diagnostic system has been applied to the design of an expert system tool for building photofinishing process diagnostic systems without the direct involvement of a knowledge engineer.

Software Estimating: A Description And Analysis Of Current Methodologies With Recommendations On Appropriate Techniques For Estimating Rit Research Corporation Software Projects, Norma Armstrong

Theses

This thesis investigated, described, and analyzed six current software estimation methodologies. Included were Boehm's COCOMO, Esterling's Work Productivity Model, Putnam's Life Cycle Model and Albrecht's Function Point Determination. An implementation strategy for software estimation within RIT Research Corporation, a consulting firm, has been developed, based on this analysis. This strategy attempts to satisfy key needs and problems encountered by RIT Research estimators, while providing cost effective, accurate estimates.

White Chief: The Story Of Edward H. Davis, Charles Mitchell Hudgins

Theses

With Mother Earth for a couch, To sleep under the fragrant conifers; To breath the purity of the ranges; To watch the procession of the constellations; To listen to the music of the wind harps of the sierras; To leave care, worry, responsibilities behind us; To be in harmony with nature at all times; To live simply, to think severely, the love deeply, to be content; And to learn patience and tolerance from the mighty mountains; That me thinks is to be happy. Edward H. Davis Mesa Grande August 26, 1933

Culture In Vivid Color: The Villa Montezuma Windows, Marit Velma Zinko

Theses

For a full century the cultural significance of the large stained glass windows at the Villa Montezuma has been misunderstood. Now, with all the expense, effort, and energy expended to restore this beautiful historical house, it is both appropriate and timely to take a closer look at this legacy so that it can be fully appreciated and enjoyed by future generations. To properly understand these windows it is necessary to first take a brief but close look at Jesse Shepard, to understand what kind of man he was in 1887 when he came to San Diego; next to take a …

A Report On Debugging Networked Real-Time Multi-Microprocessor Systems, Anandi Krishnamurthy

Theses

Software development in networked real-time multi-microprocessor control systems is made difficult by the real-time constraints and parallel processing inherent in such systems. Software development in general, and debugging, in particular, of networked real-time multi-microprocessor systems is discussed. A tool that is a part of a debugger for such a system is described. The tool runs on a workstation with a passive user-interface and provides high-level access to the control software. The commands supported by the tool are analyzed. The software architecture of the tool is documented using data flow diagrams, a dictionary, file formats and pseudo-code.

Mission San Diego De Alcalá: 1774-1965, Toni Lynn Nagel-Walston

Theses

The Mission San Diego de Alcala has over 200 years of History hiding within its walls and outlying areas. These numerous historical treasures await to be revealed through timely research in archival repositories all over the world. The Mission first operated as an Indian Mission, and was later converted to a Military Post with ongoing agricultural endeavors before, during, and after their presence. The next occupation of the grounds by an industrial school for Indian children lasted for a number of years, and finally, after a major restoration, became a Parish Church as it still is today, and was its …

Study Of The Graininess Models Using The Macintosh Computer, Apiwat Nutavej

Theses

This study attempts to develop a Macintosh program that is able to simulate the photographic graininess models, to perform a Fast Fourier Transform, to plot a three dimensional graph, and to display a digitized image. Because of these four integrated functions, the program could become a useful tool in imaging science. The potential advantages include ease of use and the visual interaction between computer and user. When comparing the simulation results among three density models and four granularity models of random dots used in this study, the answers are found to be in close agreement with the hypothetical equations, with …

Pygraph: A Graphic Front-End For The Paisley Executable Specification Language, Richard Willison

Theses

This project is an application software system providing a graphical interface to PAISLey. PAlSLey (Process Oriented. Applicative. Interpretable Specification Language) is an executable specification language developed at AT&T Bell Labs to model real-time systems. The interface provides the user with a tool to graphically depict a real-time system. The graphics package, called PyGraph, has been implemented on a Sun 3 in a multi-window environment. While developing a graphic, PyGraph generates a PAISLey specification template for the graphic image. The template is filled out by the user with assistance provided by PyGraph.