Digital Commons Network^™

Workings Of A Male Hegemonic Discourse: Representations Of Women In Life Magazine Around Wwii, Lisa Bloom

Theses

None provided.

Basic Characteristics To Achieve Common Sense Reasoning, A. Raul Maselli

Theses

Not Included

Short Time Spectrum Analysis-Synthesis Of Speech, Dusan Vujcic

Theses

This thesis presents an extensive study of the short time spectrum analysis-synthesis of speech. This type of speech processing attempts to synthesize speech without the short time Fourier transform phase information. Several existing analysis-synthesis methods are presented. In addition, five other methods are attempted experimentally. The results of these experiments are explained, identifying some very important properties of the short time spectrum analysis-synthesis. One of the methods was shown to synthesize a high fidelity speech. Finally, a comparison is made between this method and other known methods which are based on short time Fourier transform approach.

The Static Analysis Of A Complex Optical-Mechanical System Utilizing The Finite Element Method, Thaddeus A. Kciuk

Theses

This thesis utilizes the finite element method (MSC/NASTRAN) to perform an analysis on an optical-mechanical laser scanner used in the imaging industry. A Normal Modes analysis was conducted to determine the real eigenvalues and their associated eigenvectors. The results of the analysis (modal frequencies and modal shapes) were then compared with empirical data measured using a FFT (Fast Fourier Transform) analyzer with modal software (Hewlett Packard 5423A Dynamic Signal Analyzer). The dynamic characteristics of the system optical output beam and optical components were evaluated by simulating the optical components using rigid bar elements. A modal frequency response analysis was performed …

Mobile Telephone System And Non-Wire Line Network, Daniel Chi Man Cheung

Theses

The need to communicate with non-fixed points without the use of wires led to the development of mobile telephone systems in the early 1920's. Since then, the expanding need for mobile phone service and resulting growth have led to the development of the Advanced Mobile Phone Service (AMPS) by the Bell System. This thesis describes the AMPS system and explains how service is provided to mobile units roaming in a typical area of up to 25 square miles. A network is proposed to interconnect service areas to expand the coverage to a much larger geographic area. Efficient use is made …

Mathematical Modeling Of The Nikon Lampas Reflection Measuring Microscope, William O. Bennett

Theses

A mathematical model of the Nikon Lampas Reflection Measuring Microscope for the fine-line lithography in integrated circuit manufacture has been developed. Optical intensity profiles of a perfect line were computed using computer software supplied by the National Bureau of Standards. The programs were modified for the Lampas microscope. From line profiles, the accuracy of the microscope was calculated. The microscope is accurate down to 6/10 of a micron. All lines below 6/10 of a micron were unresolved.

Comparison Of Existing Linewideth Measuring Systems To An Experimental Unit That Enables Minimization Of Vibration During Measurement, James G. De Witt

Theses

An experimental unit was built to minimize vibration during measurement of linewidths on integrated circuit photomasks. Linewidths in the range of 0.522 microns to 12.076 microns were measured with the Nikon LASER scanning system. Optical Specialties Inc. VLS-I video system, Nikon Micro Pattern Analyzer slit-scanning system, and the experimental unit. Average variances of 0.0096, 0.0164, 0.0377, and 0.3627 were calculated for each system respectively. The variances were compared using an F-test with the result that each system was significantly different for each linewidth. A mathematical model was derived to predict the smallest resolvable detail given the frequency and amplitude of …

Balancing Of The Shaking Force, Shaking Moment, Input Torque And Bearing Forces In Planar Four Bar Linkages, Timothy C. Hewitt

Theses

The theory, development and application of a computer program to balance the combined effects of the shaking force, shaking moment, input torque and individual bearing forces in four bar linkages is presented. The theory assumes the linkage to consist of rigid bodies, and is limited to balancing planar four bar linkages other than sliders. Balancing is accomplished using circular counterweights which are tangentially attached to the bearing joints. Counterweight sizes and locations are determined using nonlinear programming techniques where an objective function, dependent upon all the kinetic parameters, is minimized. The balancing program is capable of performing diverse functions. The …

A Study Of The Relationship Of Sheffield & Igt Methods For Determining Paper Smoothness And Their Ability To Predict Gravure Printability, Austin Sung

Theses

A variety of methods have been devised for the measurement of the smoothness of paper. These are reviewed and summarized in this work. Of the available methods, two of the most widely used have been selected for study. The air-leak method exemplified by the Sheffield instrument, and the nip-spreading method of the IGT printability tester are specifically presented and performed. The data obtained in empirical experiments are statistically analyzed and plotted, so as to determine if there is a functional relationship between the responses of these two methods. A linear relationship between the two is shown to be an appropriate …

Non-Linear Principal Component Analysis (Approximation By A Second-Order Taylor Series), John Viggiano

Theses

Linear Principal Component Analysis (LPCA) has been applied in multivariate analysis because of its many optimality properties. However, when applied to locate singularities in a set of data, LPCA is only able to locate linear singularities. If the problem being considered tends to produce variables with non-linear relationships, such as with non-linear regression, LPCA is necessarily of limited utility in identifying singularities. Non-linear generalizations of PCA have been suggested in the literature. Essentially, these involve augmenting the data with higher-order terms, in particular square and cross product terms, and running a LPCA on the augmented data set. The problem with …

A Study Of Rochester Area Hospital Information Systems, Shantanu Bhagoji

Theses

None provided.

A Method For The Identification Of Parameters In Nonlinear Time-Varying Discrete Systems, Somo Coulibaly

Theses

The purpose of this thesis is to present a new technique for estimating the unknown parameters of nonlinear discrete time-varying systems.

The method is based on the model-reference control system where the model and the plant are controlled to exhibit the same output trajectory. The model is chosen to be linear and stationary. To develop the procedure of identification we assume that the structure of the nonlinear system is known and all the measurements are free of noise. A feedback input is adapted to improve the scheme. This scheme can be used to simultaneously identify the parameters when the control …

Correlation Of Dissolved Oxygen With Flowrate And Water Temperature In The Passaic River Basin, Shan-Pei Fanchiang

Theses

Passaic River water is utilized by a number of major water purveyors in New Jersey. They are the North Jersey Water Supply District Commission, the city of Jersey City, the city of Newark, the Commonwealth Water Company, and the Passaic Valley Water Commission (i.e. PVWC).

Since all are interrelated in that the demands and releases of each affect the other, there is an interest in insuring sufficient water to maintain adequate water quality for the last user on the line (i.e. PVWC) who draws water close to Little Falls.

Having daily data of flowrate, water temperature and dissolved oxygen in …

Enhancement Of The Integrated Mechanisms Program (Imp) By Addition Of Graphic Output, Anil Parsaram Hingorani

Theses

The Integrated Mechanisms Program (IMP) is enhanced to include the capability of graphic output of simple mechanisms. The subroutines available in the graphics package GP-10 are used. The output consists of a drawing of the mechanism at its initial position and for every position for which the analysis is done. In addition, a graph of velocity and/or acceleration against the angle of the driving link may be plotted. There are limitations. The output of the mechanism represents only prismatic joints by a different symbol. It is represented by a rectangle and the symbol of the fixed link. All the other …

Optimization Of The Sputtering Technology For Preparation Of Hg1-[Subscript X] Cd[Subscript X] Te Heterojunction Diodes, Kyriacos Kokkinos

Theses

The deposition of (Hg_1-xCd_x)Te onto Si and (Hg_1-yCd_y)Te (x>y) substrates by rf triode sputtering was studied. Ionized mercury vapor, in the 0.6 to 1.2 micron pressure range, was used to bombard pressed-powder targets, consisting of HgTe and CdTe particles, with effective target x value of 0.3, 0.35, and 0.4. The sputtering procedure, parameters, and system were modified to optimize film characteristics. Higher substrate temperature (270°C) was required to obtain metallic gray films with x>0.3. With substrate temperatures less than 270°C and deposition rates 0.5-1.0 micron per hour the films were …

Contaminant Transport Against A Slowly Moving Fluid : An Experimental Investigation, Surya Man Shakya

Theses

Leachate migration into groundwater from leaking lagoons, hazardous waste sites, solid waste disposal sites, etc. has recently become a major cause of groundwater pollution. A possible solution to prevent leachate migration into groundwater is to create a negative hydraulic gradient toward the site. This can be achieved by installing two parallel slurry trench cut-offs around the perimeter of a leaking lagoon and by filling it with water. The water und-er the influence of positive hydraulic gradient will move toward the site and will finally find its way on the surface of the lagoon. Along with the flow of water, the …

Japanese Management Techniques And Its Transition To Taiwan, Shih-Tung Shu

Theses

Japan's success, as measured by a vertically increasing balance-of-payments surplus, has created serious issues between Japan and other industrial democracies. It has created fears about the economic superpower status of Japan. On the other hand, because of this very success in coping with worldwide economic problems and in sustaining its export drive, Japan's unique style of managenemt has attracted a great deal of attention. As the Japanese have begun to demonstrate on ability to transfer their management style to the U. S. and other western countries, Japanese management and its transferability continue to be a subject of special interest in …

Design Of A Photoreactor For The Oxidation Of Toxic Pollutants In Water By Ozone And Ultraviolet Radiation, Andrew Youngrak Park

Theses

A photoreactor has been set up to study the feasibility of ozone and ultraviolet radiation for treating pollutants in water. Phenol, 2,4-dichlorophenol, and 2,6-dichlorophenol were chosen as pollutants in this study.

The reaction kinetics mechanism has been postulated to be consisted of ozone decomposition, oxygen activation by UV, and reaction of pollutant with ozone, UV, and activated species. The corresponding reaction rate constants were found, using Rosenbrock optimization program, from four different experiment sets --- reaction of pollutant with ozone; reaction of pollutant with UV; reaction of pollutant with O₂/UV; reaction of pollutant with O₃/O_{2 …}

An Experimental Investigation Of The Kinetics And Thermal Properties Of Poly(Ethylene) Terephthalate And Its Related Di-Acid Modified Copolymers, Satish Baliga

Theses

Poly(ethylene) Terephthalate , PET, is synthesized from purified Bis-hydroxyethyl Terephthalate,(BHET), in the presence of antimony oxide catalyst. Rate constant for the polycondensation reaction, based on a second order kinetic model is found to be 152.4/mol/hr.

A new modified polyester Polyethylene Adipic Terephthalate (PEAT) is synthesized from BHET and adipic acid. The effect of adipic acid content in the copolymer,on the rate of polycondensation is studied. Adipic acid is shown to improve the activity of the polymer chain ends thereby increasing the apparent reaction rate constants.

The modified polyesters are observed to melt at a lower temperature than PET. Moreover, the …

Computer Aided Design Of Optimum Structures, Sanjay M. Alexander

Theses

Techniques for the improvement of procedures for large scale structural synthesis are investigated. Considerable amount of research has been devoted to structural optimization. Yet as developments continue in this area, constant improvements in structural analysis methods, most of which are computationally demanding, tax the ability of existing optimization procedures to use the most powerful of the new analysis techniques effectively. This thesis presents optimization of structures modeled by classical discretized finite elements using the direct stiffness approach. The technioue presented here utilizes a Mathematical Programming (MP) method, which is based on Zoutendijk's feasible Direction Finding Problem (DFP). Modifications on Zoutendijk's …

Reliability Screening Of Transformers, Bharat M. Shah

Theses

The purpose of this project is to study screening of components from the reliability point of view. The component used is electronic transformer. The screen chosen is Electrical Noise generated in the transformer insulation system and the failure mode selected is leakage current in the transformer insulation.

Experiments were conducted to monitor electrical noise generated due to partial ionization of the tiny air gaps in the transformer insulation. The voltage stress, regiured to be applied to the insulation system, for constant 59 units of noise, recorded for the sample of three hundred seventeen transformers.

The voltage readings were analyzed statiscally …

Application Of Least Square Cubic Splines To The Analysis Of Edges, Roland Walter Porth

Theses

A technique using least square cubic splines was developed to obtain an estimate of the MTF from edge response measurements. By making specific assumptions concerning the general nature of edges to be analyzed, an optimized procedure was developed to fit noise free cummulative gaussian edges. The procedure was evaluated using simulated data from various spread function shapes and levels of additive noise. The spline technique produced MTF estimates which had less bias and lower variance than the commonly used derivative - transform technique. Due to the various constraints which can be imposed on the spline, least square cubic splines actually …

Optimization Of Vehicle Suspensions Subjected To Random Excitation, Rifaquat Ali Cheema

Theses

This study provides basic information on the analysis and optimization of vehicle suspension systems with a damped absorber attached to the sprung mass and the un sprung mass. This study is also concerned with comparing these systems with a optimized conventional system. A two degree of freedom linear model subjected to guideway irregularity, described as a hyperbolic displacement spectral density, random excitation is chosen for studying the system. Dimensionless space and design parameters are selected to allow for adequate generality. The objective function incorporates the tire-terrain normal force, as an indication of the vehicle controllability, constrained by the sprung mass …

A Signal-To-Noise Ratio Analysis Of An Autoradiographic Image Enhancement Process, Donald R. Williams

Theses

A signal-to-noise ratio(SNR) analysis of a S-35 thiourea autoradiographic image enhancement process incorporating subproportional bleaches is performed, with emphasis on diagnostic medical Imagery. Quantifying SNR through a spatial frequency definition of DQE and NEQ, these metrics were compared between donor and receiver-composite stages. While improvements in radiometric speed and gamma were noted in the receiver-composite, these gains were more than offset in a SNR sense by correspondingly lower MTF and higher Wiener spectrum values. As a result the donor's DQF_max of .30 exceeded that of the receiver-composite's DQE_max by 50%. Similarly, ImCXA the donor's NEQ_max exceeded that of the receiver …

Information Theoretic Metrics For The Assessment Of Digital Image-Tone Restored Images, Paul W. Melnychuck

Theses

Digital image-tone restoration is examined in terms of information theoretic-based measurements. The metrics illustrate the relative degree of restorability of a 6-stop underexposure range on Kodak Tri-X pan film. An image chain model is developed to account for the discrete nature of sampled images used in digital image processing. The model includes the major system components (from object to viewed image) from which the system signal-tonoise ratio is calculated. Quantization noise and clipping are treated as signal-dependent, additive noise sources, and are shown to play a major role in degrading restored images. Although the eye characteristics are not included in …

Simulation Of Particle Size Distribution In Continuous Emulsion Polymerization Through A Modified Population Balance Approach, Ying-Yuh Lu

Theses

A detailed mathematical model for particle size distribution in continuous emulsion polymerization of styrene and vinyl acetate is proposed on the basis of the population balance in the presence of several kinetic and mass transfer processes. This study is limited to the Smith-Ewart case II, which assumes instantaneous free radical termination within polymer particles. Radical desorption mechanism from polymer particles is included in the model and the desorption rate is formulated from the diffusion theory which suggests that the rate coefficient should be inversely proportional to the surface area of polymer particles.

Spectral Method Of Color Conversion Filter Thickness Applied To Simulation Of Cie Illuminants, Paul Butterfield

Theses

A spectral method of determining color conversion filter thickness is described. This method uses spectral data from system parameters to determine thickness. Optimization of the input distribution by varying bulb current is discussed. Using the spectral method of thickness variation, two CIE Illuminants, D55 and D65 were simulated. The simulators were measured for goodness of fit and showed a strong similarity with their respective simulators. Mean square deviations were calculated for each Illuminant and were 11.09 and 11.33 for D55 and D65 respectively.

A Quantitative Image Evaluation Study Of A Concurrent Photon Amplification Treated Emulsion, Konrad E. Kern

Theses

A study was performed to evaluate the effect of concurrent photon amplification (CPA) on Kodak Tri-X Pan emulsion in regard to image quality. The study evaluated detective quantum efficiency (DQE), modulation transfer function (MTF), and information content (IC) as a function of exposure in a comparison between normal exposure and CPA. The results showed CPA to enhance image quality relative to normal exposure at very low exposure levels. As the exposure was increased, normally exposed images became comparable and then exceeded CPA exposures in image quality. The exposure level at which normal exposure became preferential was distinct with each image …

Geometry And Vision To Galen, Mario Biagioli

Theses

None provided.

A Microprocessor Based Hybrid System For Digital Error Correction, Peter H. Sohn

Theses

The design of a microprocessor based hybrid system for digital error correction is presented. It is shown that such a system allows for implementation of several cyclic codes at a variety of throughput rates providing variable degrees of error correction depending on current user requirements. The theoretical basis for encoding and decoding of binary BCH codes is reviewed. Design and implementation of system hardware and software are described. A method for injection of independent bit errors with controllable statistics into the system is developed, and its accuracy verified by computer simulation. This method of controllable error injection is used to …