Digital Commons Network^™

No Revelations, Mark C. Tierney

Theses

None provided.

Synthesis And Characterization Of Maleimide-Based Polymers, Hua-Chin Chen

Theses

This study concerns the synthesis and characterization of maleimide-based monomers and polymers. N-phenylmaleimide, 4'-N-maleimido-2,3'- dimethylazobenzene and N-p-chlorophenylmaleimide monomers were formed by imidizing maleic anhydride with aniline, 4'-amino-2,3'-dimethylazobenzene and p-chloroaniline, respectively. But N-nitrophenylmaleimide monomer was produced from the nitration of N-phenylmaleimide monomer. The two homopolymers, poly-(N-p-chlorophenylmaleimide) and poly-(Nnitrophenylmaleimide), were synthesized by solution polymerization in toluene solvent. Poly-(Styrene-co-N-phenylmaleimide) and poly-(Styrene-co-4'-Nmaleimido- 2,3'-dimethylazobenzene), each with compositions of [50:50] and [92:8], were produced by imidizing maleic anhydride constructing commercial poly-(Styrene-co-maleic anhydride); [50:50] and [92:8]. Styrene and Nphenylmaleimide monomers were copolymerized in both solution and emulsion to form poly-(Styrene-co-N-phenylmaleimide). Likewise, styrene and 4'-Nmaleimido- 2,3'-dimethylazobenzene were copolymerized …

Hydroboration-Oxidation Of Styrene, 2,3 Dihydrofuran And Quadricyclene Dimethylester Promoted By Wilkinson's Catalyst, Pingyun Feng

Theses

None provided.

A Common Application Model For Interfacing With Advanced Program To Program Communication/Vm, Joseph Viviano Jr.

Theses

The Merrill Lynch data processing environment is composed of a conglomeration of applications which reside on various platforms. LAN and minicomputer based applications coexist with those making their home in the mainframe arena. Unfortunately, coexistence does not imply cooperation, data uniformity, data centralization or coordinated application development. Within the Merrill Lynch mainframe arena alone there are two operating systems which reside across several computing complexes, MVS (Multiple Virtual Storage) and VM (Virtual Machine). Critical business applications and data are unique to each of these environments. The problem lies in the need for cooperative processing and sharing of distributed data among …

Broadband Isdn Control Using Neural Networks, Stavros Zervoudakis

Theses

Broadband Integrated Services Digital Networks (B-ISDN) are considered to become the standard communications networks in the near future. Major research efford is being applied in determining the appropriate mode of operation for B-ISDN systems. Two proposals, the Synchronous Transfer Mode (STM) and the Asynchronous Transfer Mode (ATM) claim to best fit the B-ISDN transmission requirements individually. A new method for B-ISDN traffic control is proposed in this paper. This method assigns priority levels to incoming traffic while integrating STM with ATM. A neural network is used to decide how the multiplexing of the incoming packets will be performed. Several traffic …

Delay Performance Of Cebus And Modified Cebus Schemes, Altaf Hussain

Theses

In this thesis the performance of the CEBUS (Consumer Electronics Bus), a local area network proposed by the Electronics Industries Association for the 'Smart House,' is analyzed under varying network load and traffic patterns that would occur in a typical home environment. Reduced complexity versions of the CEBUS scheme are compared with the standard CEBUS scheme.

It was found from simulation analysis that the delay in the CEBUS network, at a given network bandwidth, is dependent upon the message priority and the traffic pattern in the network. It was also observed that the performance of a modified CEBUS scheme was …

An Experimental Sequence Examining The Effect Of Task Type, Memory Condition, And Display Presentation Type On Performance Time And Error Rate, Using Columnar Table Versus Vertical Bar Graph Versus Line Graph, Suparna Das

Theses

A total of 126 subjects at various levels of school and a health related manufacturing firm participated in three experiments that compared Tables, Line graphs and Bar graphs forms of data presentation. The experiments were performed each consisting of a training task followed by answering some questions based on the presented material. The experimental series were presented to six groups. Group 1, 3, 5 viewed Line graphs, Tables or Bar graphs respectively while answering the questions while the other three groups answered questions based on memory of either Line graphs, Table or Bar graph presentation.

The independent variables were:

1. Memory …

Canmol : Expert System In Medicine, Kulin Hemani

Theses

The intriguing words for the nineteen nineties are "Expert Systems", and "Artificial Intelligence". To a layman these terms conjure up thoughts of spaceships and futuristic beings. In reality they exemplify man's capability to harness technology.

Expert systems are computer software programs that make use of previously accumulated knowledge to assist in solving complex problems.

In recent years the practice of medicine has changed dramatically from a fundamentally individually deductive approach to an Artificial Intelligence based science. The modern physician no longer draws conclusions simply by examining the patient. Today the physician employs sophisticated computer based diagnostic tools to generate a …

Automation Of Part Inspection In A Coordinate Measuring Machine, Madhu N. Kanoor

Theses

Some of the drawbacks in inspecting a part using a Direct Computer Controlled Coordinate Measuring Machine are that a programmer has to generate a part program for the inspection process, and such programs have to be generated for each part to be inspected. These programs will be restricted to a kind of CMM, thus preventing the portability of the program t o other kinds of CMM.

If a part program can be generated off line after a part has been designed in a CAD system. an operator can inspect the part without any prior knowledge of the esoteric CMM programming …

Biodegradation Of Phenol And 4-Chlorophenol Using A Single Species In A Sequencing Batch Reactor, Kung-Wei Wang

Theses

Biodegradation of phenol and 4-chlorophenol (4CP) using Pseudomonas putida (ATCC 17514) was studied in batch and sequencing batch reactors. Batch experiments were first performed in order to reveal the kinetics of biodegradation for each substrate. 4-Chlorophenol was degradable only in the presence of phenol, or immediately after exposure of the organism to phenol. It was postulated that an enzyme induced by the presence of phenol was necessary to initiate degradation of 4-chlorophenol.

A mathematical model was then developed to describe the dynamic behavior of both substrates in a sequencing batch reactor (SBR). The model utilized rate parameters obtained from batch …

Direct Recovering Of Surface Structure Characterized By An Nth Degree Polynomial Equation Using The Uoff Approach, Mazen A. Salhi

Theses

There are two different approaches for estimation of structure and/or motion of objects in the computer vision community today. One is the feature correspondence method, and the other is the optical flow method [1]. There are many difficulties and limitations encountered with the feature correspondence method, while the optical flow method is more feasible, but requires a substantial amount of extra calculations if the optical flow is to be computed as an intermediate step.

Direct methods have been developed [2-4], that use the optical flow approach, but avoid computing the full optical flow field as an intermediate step for recovering …

Deconvolution Applications In Arterial Dynamics, Shanthi Ganesan

Theses

This thesis deals with the computation of the Arterial Impulse Response Function by deconvolving aortic pressure and flow signals in time domain. Several methods have been developed in the past to obtain a solution for the convolution integral. These are (1) Transform method, and (2) Numerical Approximation methods : a. Conventional method b. Relaxation methods.

These methods have been applied in the past to the RC network model and it was found to work well. In this thesis, the methods are applied to data from more realistic models and also on data obtained from dogs. The model considered is a …

Knowledge Based Designing Of Broadband Coaxial Cable Networks, Tauqir Hameed

Theses

The objective of this research was to build a broadband coaxial cable network. One of the basic requirement of a network is the physical link transmission medium. For the purposes of this research, broadband coaxial cable was chosen as a physical medium of data communication. The approach taken in this research was to divide network design into three main steps. In the first step, the decision on topology of the network was determined. Both Star and Minimum Spanning Tree topologies were used and then the Esau-Williams Algorithm was employed to minimize the cable length. In the second step, various signal …

A Pen-Based Computer For The Delivery Person, Gwo-Chyuan Chen

Theses

None provided.

Optimization Algorithms For Shortest Path Analysis, Susan M. Hojnacki

Theses

Discrete optimization algorithms exist for analysis of network optimization of flow problems. Computer programs written from these algorithms can be used for local area network analysis of point-to-point computer networks, transportation networks, resource allocation, distribution, and production scheduling. One aspect of a network that can be optimized using discrete optimization algorithms is the length of the path that data will take when traveling through the network. One node in the network signifies the source node and a second node is the sink or destination. The object is to find the shortest path between the two nodes. The definition of shortest …

Design And Simulation Of A Primitive Risc Architecture Using Vhdl, Evangelos Moustakas

Theses

Hardware Description Languages are used as the connecting links between the design of a digital system and the way this design is being represented in computers, with the ultimate goal being the simulation and verification of that design before the construction of any prototype. In this thesis, we follow all the steps of a RISC architecture design and finally use VHDL as the tool to describe, simulate and verify the design. By the unique abilities of VHDL we give both a structural and a behavioral description where the latter contains multiple description levels, from gate to Processor-Memory-Switch (PMS) . The …

Partnering: A Constructive Approach To Obtaining Engineer-Architect Services For The 1990s And Beyond, Donald E. Nations

Theses

This thesis will focus on a method of doing business in which two companies, whose businesses are complementary, work together in a relationship that strives to benefit both.

Large corporations continually examine ways to constructively manage the vast concept of change, and maintain their competitive posture. One way in which some corporations are beginning to strengthen their assets and their capabilities to deliver products or services is through a relationship known as "partnering."

As an oversimplified way of defining partnering, in a business-to-business relationship, one firm specializes in providing a service required by another company that the latter may not …

A Comparison Of Reliability Prediction Methodologies To Observed Field Failure Data, Randal Butturini

Theses

Reliability predictions of electronic equipment are considered highly valuable; yet the most widely used technique, Military Handbook 217 is criticized as inaccurate. The industry response to the Handbook has been to develop a myriad of methodologies for failure rate prediction. This paper uses four (4) reliability prediction methods to forecast the failure rate of two (2) circuit boards for which a field failure history exists. The predicted failure rate for each procedure on each board is compared to the actual failure rate; and a first-order correction factor is calculated.

The Performance Evaluation Of A New Neural Network Based Traffic Management Scheme For A Satellite Communication Network, Dequan Liu

Theses

The thesis describes a new neural network based traffic management scheme for a satellite communication network. The scheme consists of two levels of management. The front end of the scheme is a derivation of the Kohonen's self-organization model to configure maps for the satellite communication network dynamically, The model consists of three stages. The first stage is the pattern recognition task which selects an exemplar map that best meets the current network requirements. The second stage analyzes the discrepancy between the chosen exemplar map and the state of the network, and adaptively modifying the chosen exemplar map to conform closely …

Work-Preserving Real-Time Emulation Of Meshes On Butterfly Networks, Alf-Christian Achilles

Theses

The emulation of a guest network G on a host network H is work-preserving and real-time if the inefficiency, that is the ratio W_G/W_H of the amounts of work done in both networks, and the slowdown of the emulation are O(1).

In this thesis we show that an infinite number of meshes can be emulated on a butterfly in a work-preserving real-time manner, despite the fact that any emulation of an s x s-node mesh in a butterfly with load 1 has a dilation of Ω(logs).

The recursive embedding of a mesh in a butterfly presented by …

Nontraditional Machining Techniques With Emphasis On Waterjet Milling, Shiv K. Kunapuli

Theses

The rapid growth of harder and difficult-to-machine materials over the past two decades necessitates the development of compatible nonconventional machining techniques, as detailed in this work, with special emphasis on one of the most recent machining method, the abrasive-waterjet technique(AWJ).

The feasibility of using AWJ for milling on glass is investigated. Due to the large number of parameters involved in the AWJ technique, and the multitude of machining requirements, optimization of performance is the focus. These parameters include waterjet pressure, particle size, abrasive flow rate, traverse rate and number of passes.

Surface topography is found to be a function of …

A Biomechanical Analysis Of Three Humeral Fracture Fixation Systems, Alina Michelle Waite

Theses

Often, humeral fractures requiring internal fixation can be a challenging orthopaedic procedure. Each method of treatment possesses clinical and biomechanical advantages and disadvantages. Rigid plate fixation is highly successful in treating a large variety of long bone fractures. Nevertheless, excessive soft tissue dissection is necessary, and vascular and neural anatomy of the humerus can make plate application and removal difficult. An intramedullary nail offers a relatively simple procedure, thereby reducing these anatomical concerns. However, rotational instability at the fracture site is a common complication with a conventional intramedullary nail. Thus, a study was conducted to evaluate a new interlocking intramedullary …

An Approach To Improving The Antithrombogenesis Of Pneumatic Diaphragm Artificial Ventricle : Fabrication And Design Considerations, Hui-Sun Wang

Theses

Thrombus formation is one of the major problems in artificial heart development and its clinical applications. In order to improve the antithrombogenesis in the artificial ventricles, three aspects of investigation have been done in the laboratory.

1] the surface features and the surface defects on specially prepared samples made of polyurethane and silicon rubber were studied and analyzed by scanning electron microscopy ( SEM ), light microscopy and KEVEX Feature Analysis for understanding and controlling the blood contacting surface.

2] the polyurethane blood contacting surface with smooth surface fabricated by solution cast process, the material treatment, and the fabrication procedure …

Graded Buried Channel Charge Coupled Device Design, Zengjing Wu

Theses

A process and device simulation study has been made to optimize a new type of buried channel CCD (BCCD) structure to be referred to as Graded BCCD (GBCCD) whose buried channel is formed by multiple implantations for achieving higher charge transfer efficiency. The 2-D process simulation tool SUPREM4 and 2-D device simulation tool PISCES2 were used in this research. The simulation results of the GBCCD with double channel implants are compared with the previously obtained experimental results.

Triple channel implants under the conditions of various process parameters were also simulated and the optimized case was chosen on the base of …

Low Pressure Chemical Vapor Deposition (Lpcvd) Of Silicon Carbide From Diethylsilane, Yi-Tong Shi

Theses

The depositions of amorphous and cubic-crystal SiC from a new chemical vapor deposition source, diethylsilane(DES), have been studied. Amorphous SiC thin films and crystalline cubic-SiC materials have been deposited on silicon wafers at temperature lower and higher than 850C, respectively. The activation energy and a reaction mechanism involving the production and subsequent desorption of diethylsilene has been suggested, which explains the observed deposition dependency with the temperature and reactor pressure. A model based on the polymerization of DES is offered and the deposition rate is found to be the result of a large number of simultaneously occuring deposition processes for …

Oscillatory Potentials Model And Parameter Identification, Huizhong Pan

Theses

Two mathematicals model are presented for the oscillatory potentials of the electroretinogram. These models represent the oscillatory potential in terms of sets of parameters whose values may provide information of diagnostic value.

The test setup and protocol for obtaining the oscillatory potentials are described, as well as the data processing including acquisition up to identification of the model parameters.

Data from eight subjects, five normals and three diabetics, were used to evaluate the two models. These preliminary test results show a marked difference in the values of some of the model parameters between normals and diabetics.

Computational Analysis Of Space Transfer Vehicle Engine Turbopump Diffuser Design For Deep-Throttling, Gordon J. Wissinger

Theses

Space Transfer Vehicles (STV) are expected to perform missions (orbital transfer, Lunar/Mars transfer and descents) which will require deep-engine throttling thrust capability. To accomplish this, turbopumps which can efficiently provide a wide range of flow outputs are needed. The current state-of-the-art cryogenic fuel and oxidizer turbopump designs do not perform efficiently at off-design flow rates mainly due to stall and flow separation in the diffuser. This thesis examines how boundary layer control techniques can be used to control, reduce or eliminate diffuser flow separation. A finite element based code, FIDAP, was used to study flow in a diffuser by developing …

The Dynamics Of A Moving Boundary Between Immiscible Fluids In A Porous Medium, John Mccarvill

Theses

The analysis and simulation of the dynamics of a moving boundary between immiscible fluids in a porous medium is presented. One fluid is introduced under prescribed inlet boundary conditions and the motion of the resulting interface boundary is studied. The aforementioned scenario is simulated using a finite element based software, FIDAP. Analytical solutions developed in one dimension illustrate the concepts and serve as a benchmark for numerical solutions. The aim of computer simulation is to develop a model applicable to real situations, yet flexible enough for future adaptations to other problems with little modification.

An Investigation Of The Potential Mobility Of Gold Ions In Core/Shell Silver Bromide Emulsions, Thomas Scarsella

Theses

The degree to which non-localized gold ions migrate to the surface from the core of a silver bromide core/shell octahedral emulsion in the absence of sulfur sensitization is investigated. An octahedral core emulsion is precipitated in an oxidized gelatin environment, sensitized with gold, and covered with an additional layer of silver bromide. It was postulated that the migration of gold might be detected by a significant increase in the surface speed of the emulsion due to the catalytic enhancement of latent image formation typified by gold, and an increase in the tendency of the system to form developable sites on …

Colorimetric Tolerances Of Digital Images, Mike Stokes

Theses

An environment to derive colorimetric tolerances of images was established and an experiment using this new environment was performed. This environment allows for images to be digitally captured, colorimetrically manipulated, displayed, observed, and statistically evaluated. The visual experiment measured perceptibility and acceptability colorimetric tolerances for images using paired comparison techniques. Thirty-two observers judged six typical photographic scenes displayed on a high resolution color monitor. These scenes were manipulated using ten linear and nonlinear functions in the CIELAB dimensions of lightness, chroma, and hue angle. The tolerances were determined using probit analysis. It was found that scene content did not significantly …