Digital Commons Network^™

Low Temperature Performance Of Field Effect Transistors, Wei Zhu

Theses

The low temperature static characteristics of silicon junction field-effecttransistors (JFETs) have been investigated and analysed. The followingchanges were observed after cooling down the transistors: pinch-offvoltage and transconductance increases; and drain current is changedas a function of the drain-source voltage. It was found that there wasan increase in the amplifying properties and a reduction in noise voltageof cooled transistors. In addition, the temperature and voltage dependenceof leakage current have been studied. Temperatures below 77K are ofinterest in evaluating effects of impurity freezeout and temperatureabove 77K are important since actual device temperature will be aboutthe ambient. Operation of FET circuits at liquid …

An Interactive Computer Graphics Based Off-Line Avail Programming Environment For Coordinate Measuring Machines, Nayanesh B. Bhandutia

Theses

Productivity can be increased by providing computer aided off-line program development environment to operate direct computer controlled Coordinate Measuring Machines (CMM). Such an environment not only results in reduced operational downtime of the CMM but also eliminates the need for the operators to learn and debug the complicated CMM programming language.

An application software was developed to provide a computer based graphical environment for on-the-screen CMM inspection simulation and AVAIL part program development. A comprehensive, menu driven front-end was developed as a foundation for this software. Algorithms were designed and coded to read and interpret CAD software part design information …

The Application Of Stereolithography To The Creation Of Molecular Models Of Amiloride And Its Analogues, Thomas John Busanic

Theses

Stereolithography, a process by which a computer-guided Ultraviolet (UV) laser is applied onto a liquid monomer resin to form a solid polymer, was used to create solid models of amiloride and two of its analogues. The Cartesian coordinates used as input for the orientation of each atom in a molecule were calculated using ab initio molecular orbital theory. Since the structures of the molecules are calculated in this fashion, they represent a more accurate representation of the molecules than that provided by standard molecular modeling kits.

The original purpose of this work was to assist a blind chemist in appreciating …

Deterministic And Adaptive Routing Algorithms For Mesh-Connected Computers, Yikui Cai

Theses

The two-dimensional mesh topology has been widely used in many multicomputer systems, such as the AMETEK Series 2010, Illiac IV, MPP, DAP, MasPar MP-1 and Intel Paragon. Its major advantages are its excellent scalability and simplicity. New generation multicomputer uses a switching technique called wormhole routing. The essential idea of wormhole routing is to advance a packet directly from incoming to outgoing channel without sorting it, as soon as enough information has been received in the packet header to select the outgoing channel. It has advantages of low latency and low error rate. The problems addressed by this thesis are …

Performance Analysis Of The "Fiber Distributed Data Interface (Fddi) Network" Using Petri Nets And Spnp Software Package, Savvas Eteoclis Christodoulou

Theses

The main purpose of this thesis is to model a "Fiber Distributed Data Interface" (FDDI) Network using Petri Nets, and to analyze its performance with the help of the SPNP software package. The verification of a communication protocol, by modeling it as a discrete-event system using Petri Nets is a new approach.

The correlation between the throughput rate, voice and data throughput, and the parameters of the system, such as the network load and the network speed are investigated. An overview of the "Fiber Distributed Data Interface" is provided, along with its network protocol and the limitations of its operating …

Fast Adaptive Algorithms For Signal Separation, Robert A. Manzo

Theses

LMS and RLS type algorithms are suggested for decorrelation of multi-channel systems outputs. These algorithms act as signal separators when applied to unknown linear combinations of the inputs. The performance of the suggested algorithms is compared with that of the conventional LMS and RLS algorithms that minimize the mean square error. It. is shown that the correlation matrix eigenvalue spread associated with the LMS decorrelator is always smaller than the eigenvalue spread corresponding to the conventional LMS. resulting in faster convergence speed for the decorrelator. A new RLS type decorrelator algorithm is suggested. The RLS decorrelator is shown to be …

Managing Occupational Hazards Confronting Healthcare Workers, Kiran A. Mody

Theses

The primary goal of this thesis is to identify, evaluate, and control occupational hazards that may exist in health care facilities.

Due to the complex nature of health care facilities, healthcare workers are always challenged by an imposing group of occupational hazards. The magnitude and diversity of these hazards, and the constantly changing nature of government regulations make it difficult to guarantee absolute protection and accuracy of the material contained herein. However, awareness of the risks, compliance with basic preventive measures, and adequate interventions are all essential components to consider in protecting healthcare workers.

Therefore, potential health effects of various …

Implementation Of Continuous Flow Manufacturing In United States Industries, Rohit P. Patel

Theses

Continuous Flow Manufacturing (CFM) is one of the key strategies to enable the United States industries to adapt to any volume increase and rapidly changing requirements of the market place. CFM is an on-going analysis and improvement activity used to optimize the efficiency, effectiveness and flexibility of any process. The two basic goals of CFM are to reduce cycle time to less than customer order leadtime and to eliminate inefficiencies from the overall manufacturing processes.

The thesis will describe reasons for the scarcity of CFM in United States industries. The methodology applied was a detailed six page questionnaire sent to …

Automatic Feature Extraction From Conventional Cad Model To Support Feature-Based Design Approach For The Sheet Metal Stamping Industries, Dipak P. Thakar

Theses

Despite the continuing improvement in computer aided design (CAD) systems and improvements in computer aided manufacturing (CAM), the process planning activity has still not been completely integrated into the CAD/CAM cycle. Particularly in sheet metal stamping industries human interpretation of CAD data is required to extract the geometry and technological information of a component. As a result most CAD systems are used as advanced drafting and drawing management tools by designers. Thus the responsibility for interpreting the design data required for extracting the manufacturing part features still resides with the process planner. Which has increase possibilities of entering errors with …

Narrow-Band Interference Rejection In Spread Spectrum Using An Eigen Analysis Based Approach, Aparna Vadhri

Theses

A new adaptive technique is suggested for rejecting narrow-band interferences in spread spectrum communications. When data is coded using a pseudo-noise code, the received signal consists of a wide-band signal with almost white spectral properties, thermal noise, and correlated narrow-band interferences. A new approach is proposed which exploits the statistical properties of the received signal via eigenanalysis of the received data. While the energy of the wide-band signal is distributed over all the eigenvalues of the signal autocorrelation matrix, the energy of the interference is concentrated in a few large eigenvalues. Hence, the eigenvectors corresponding to the large eigenvalues are …

Parallel Exact Enumeration Of Self-Avoiding Walk On Cubic Lattices And Its Applications To Protein Folding Studies, Anek Vorapanya

Theses

Exact enumeration of self-avoiding walk on many lattices have been studied extensively recently. Even a short chain polymer (about 30 monomers) represented as a chain of cubic lattice sites requires a considerable amount of computer time to exhaustively search for all unique conformations. However, self-avoiding walk process can be modified such that it exhibits a high degree of independence among subprocesses. Parallel implementation of such subprocesses can reduce a great amount of enumeration time. Parallel enumeration makes longer chain enumeration possible.

Enumerating only unique conformations requires that all rotation and mirror conformations be removed. An algorithm to avoid generating such …

Interference Cancellation By Time Adjustable Sampling, Josko Zec

Theses

The problem of improving the frequency response of linear arrays is addressed in this thesis. The improvement is measured in the level of rejection of the undesired sources. A new, simple, and practical method is suggested. It is based on adjusting the sampling time in selected channels. Interference cancellation for finite bandwidth signals is accomplished only at, or close to, the carrier frequency. Wideband cancellation requires additional hardware and computational complexity. Conventional way of the wideband interference cancellation utilizes tapped delay line adaptive filters in each channel.

The Time Adjustable Sampling (TAS) method achieves a part of the tapped delay …

Extracting Parallelism At Compile-Time Through Dependence Analysis & Cloning Techniques In An Object-Based Paradigm, Binoy Ravindran

Theses

The construct of Abstract Data Type (ADT) modules and Abstract Data Object (ADO) modules supported by most object-based languages are a great source for developing reusable code. To improve the run time performance of such object-based programs, we consider the asynchronous remote procedure call (ARPC) model of parallel execution, in which concurrency is achieved by having the caller and the callee (which are module instances) running on different processors. Frequently, an ADT module is needed simultaneously by other modules, thus causing contention. To resolve this, we clone the module instance in demand and distribute the copies across different processors, so …

Sfumato And Conjunction, Scott Joseph Dohring

Theses

For the studio section of my MFA in painting thesis, I have produced a series of paintings on canvas concerned with non-objective impasto/textured color fields, some include representation in line, abstract overlays/underlays, while some involve division of the canvas into abutting characteristic approaches. The mediums used include water based & oil based paints, textural compounds (gel medium, joint compound, mastic, talc), pencil, and occasionally found objects. In this paper, I shall analyze and discuss impressions, concepts, and meditations relevant to my thesis work in particular and to the issue of reconciliation between formalist and post-modern approaches to theory/criticism in general …

Adtech Interactive Media Network, Steven Buccellato

Theses

None provided.

The Hiding House, Michele Lynn Vavonese

Theses

None provided.

The Effects Of Atmospheric Pollutants On Library Microforms, Edward Zinn

Theses

None provided.

Semiotics And Cross-Cultural Communication, Lingya Dubinsky

Theses

None provided.

Metaphor In Fiber, Metal And Stone, Marilyn Feinberg

Theses

None provided.

Scuplted Spirituality, Carolee Weglarz

Theses

None provided.

A Gender Specific Interactive Project To Promote Bilingual Literacy In American Sign Language And Written English, Catherine Stotts

Theses

What do young adults (age 12-18) think entertainment consists of? Is it movies, television, computer games, video tapes, multi-media products? What about books, are books considered entertainment? Because interactive multi-media can incorporate text, sound, music, animation, Quicktime movies and allows user interaction, books have become a neglected part of the entertainment market. Even though multi-media can be highly interactive, reading books is highly interactive too. The readers must use their imagination to construct the many images, sounds, and moods of the book. There is the concern that people really don't know how to read. A vast majority of these multi-media …

Evaluation Of A Cooled Cid Camera System (Sicam - The Cid-Based Scientific Camera) For Low Light Imaging Applications, Chen Tang

Theses

The performance of liquid nitrogen (LN2) cooled digital scientific instrumentation camera incorporating a large format (512 x 512, 2 0.3 mm diagonal) Charge Injection Device (CID) imager which was fabricated by CIDTEC for use in low-light imaging applications is described in this thesis. The LN2 cooled camera outputs 14 -bit digital pixel data which can be read out randomly and non-destructively from individual pixels, multiple sub-arrays, or from the entire imager. CID's have the unique capability to skim accumulated pixel charge and/or non-destructively read pixel information, enabling the system user to monitor events and dynamically adapt application exposure in real-time …

An Investigation Of Amplitude & Frequency Modulated Screening On Dot Gain And Variability, Kelly Laughlin

Theses

This study examines the effect of screening on dot gain and variability. Essentially two hypotheses are examined: first that as screen ruling is increased, the level of dot gain is increased; and second that as screen ruling is increased the level of variability is increased. These predictions are also applied to stochastic or frequency modulated screens which are presumed to behave as very screens due to their fine dot structure. A mathematical model referred to as the border zone is proposed to describe the nature of the gain and the variability for each of the screening systems. The hypotheses were …

A Study On Understanding The Use Of A Process Color-Based Color Communication Systems To Print Synthetic Colors Accurately And Consistently, Michael Gerald Go Lim

Theses

The study is intended to provide a better understanding on the use of process color-based color communication systems such as those provided by Focoltone, Trumatch, and Pantone, in order to print synthetic colors as accurately and as consistently as possible. Using Focoltone's system, an investigation was done on the materials and documentation, as provided by the Focoltone kit. The available information, as provided by Focoltone, was supplemented by the author's interpretation of Focoltone's specifications. From the author's understanding of Focoltone specifications, a set of procedures were outlined that would contribute towards the accurate and consistent reproduction of synthetic colors on …

An Interactive Multimedia Presentation For The Department Of Residence Life Apartment Area, Maura Daly

Theses

As a Complex Director for Residence Life I have had to deal with many questions regarding life in the RIT apartment complexes. As an Editor I recognize the need for clear and easily accessible answers to commonly asked questions. This multimedia presentation should address both these issues. Created was a presentation for students that are interested in renting an apartment on campus. Currently there is nothing available, beyond a pamphlet, to help them make an informed choice about where to live. This presentation will aid the Department of Residence Life in their impact on occupancy because it will state clearly …

Kinematic Analysis And Synthesis Of Four-Bar Mechanisms For Straight Line Coupler Curves, Arun K. Natesan

Theses

Mechanisms are means of power transmission as well as motion transformers. A fourbar mechanism consists mainly of four planar links connected with four revolute joints. The input is usually given as rotary motion of a link and output can be obtained from the motion of another link or a coupler point. Straight line motion from a four bar linkages has been used in several ways as in a dwell mechanism and as a linkage to vehicle suspension. This paper studies the straight line motion obtained from planar four-bar mechanisms and optimizes the design to produce the maximized straight line portion …

Emotional Armor, Catherine M. Stobie

Theses

None provided.

On Issues Of Equalization With The Decorrelation Algorithm : Fast Converging Structures And Finite-Precision, Andrew James Bateman

Theses

To increase the rate of convergence of the blind, adaptive, decision feedback equalizer based on the decorrelation criterion, structures have been proposed which dramatically increase the complexity of the equalizer. The complexity of an algorithm has a direct bearing on the cost of implementing the algorithm in either hardware or software. In this thesis, more computationally efficient structures, based on the fast transversal filter and lattice algorithms, are proposed for the decorrelation algorithm which maintain the high rate of convergence of the more complex algorithms. Furthermore, the performance of the decorrelation algorithm in a finite-precision environment will be studied and …

The Spatial Experience In Visual Communication, Ya-Li Hsu

Theses

None provided.

Magnetic Resonance Imaging Center, Shannon O'Neil

Theses

None provided.