Digital Commons Network^™

Discrimination Against Female Graduate Teaching Assistants, Joanne Ardovini-Brooker

Dissertations

Many studies have been done concerning the classroom climate, particularly in the university setting. It has been found that the classroom climate for women is one that is cold, unreceptive, unwelcoming, and even hostile to women. This chilly reception is endured by female undergraduate students, graduate students, and professors. This researcher believes that the chilly classroom climate also extends to female graduate teaching assistants/instructors. I also believe that this chilly climate may be chillier and more hostile for them, since graduate teaching assistants/instructors do not have the status associated with a doctoral degree. This concept is the basis for what …

The Clastogenic Effects Of Cyclophosphamide And A Sixty Hertz Electromagnetic Field On Bone Marrow Cells Of Cd-1 Mice, Kevin K. Block

Dissertations

Extremely low frequency (ELF) electromagnetic fields (EMF) have been correlated with the induction of cancer in a number of epidemiological studies (Feychting and Ahlbom, 1993; T,m and Lee, 1994; London e t al. 1991; Lovely et al., 1994; Tomenius, 1986; Wertheimer and Leeper, 1979, 1982). Two hypothesis were tested in the present study. The first hypothesis tested was that exposure to a 7.3 G magnetic field for 24 hours would increase the frequency of clastogenic and/or mutagenic events in bone m arrow cells of mice. The second hypothesis tested was that exposure to a 7.3 G magnetic field for 24 …

What’S Good For Gm… : Deindustrialization, And Crime In Four Michigan Cities, 1975-1993, Rick Matthews

Dissertations

This study examines the effects of deteriorated economic conditions caused by General Motor's deindustrialization efforts between 1975 and 1993 on crime rates in four Michigan cities. The Michigan cities ofFlint and Saginaw are used as examples of cities that were highly dependent on General Motors for their economic well-being, and are compared with Lansing and Grand Rapids which had more diversified economies and experienced less social disorganization. It is hypothesized that General Motor's deindustrialization efforts in Flint and Saginaw caused social disorganization to increase, which, in turn, caused crime rates to increase. Lansing and Grand Rapids, on the other hand, …

Underdevelopment As Meta-Axiological Dilemma: The Socioeconomic Implications Of African Axiology For Rational Choice Determinants Of Microeconomic Agency, Sundiata Keita Ibn-Hyman

Dissertations

The intergenerational problems of indigence, poverty and social dysfunction that plague African societies are inextricably grounded in the broader issue of ethnocentrism in neoclassical microeconomics. Economic anthropology provides a methodological critique of the conceptual limitations of neoclassical micro-behavioral assumptions narrowly imposed on non-westem economic organization. While recognizing non-westem economic praxes, the sociological implications of strict neoclassical microeconomic agency for non-westem socioeconomic development is conspicuously ignored. The critique fails to specifically consider the impact of neoclassical ethnocentrism to non-westem sociocultural organization and improvement.

This research utilizes an African-centered, social psychological approach to examine the paradigmatic implications of rational choice criteria for …

A Test Of A Rapid Developer Model: Workplace Factors Associated With Learning And Development, James A. Alexander

Dissertations

The speed at which individuals and organizations learn and develop is a vital contributor to organizational change and organizational effectiveness. This study postulated the notion of "rapid developers”, those persons who learn and acquire job competence more quickly than their peers. The purpose of this study was to identify, define, and differentiate the factors associated with "rapid development."

The author constructed a rapid developer model based upon the review of the disciplines of training, performance technology, total quality, organization learning, and organization culture. The model identified and defined the contextual factors that could be expected, based on an understanding of …

The Lived Experience Of Women Prior To Hospitalization For Acute Myocardial Infarction, Llamae R. Hughes Dnsc

Dissertations

Recent research indicates that the majority of women underestimate their risk of developing coronary artery disease (CAD). CAD claims the lives of more women than all forms of cancer; however, women have not received the symptom recognition or treatment that has been accorded to men with CAD. Review of literature indicated a lack of research regarding the experiences of women with acute myocardial infarction (AMI). This phenomenological study explored the lived experience of women with AMI immediately prior to hospitalization. The lines of inquiry focused on descriptive language regarding pre-event feelings, the symptoms experienced at AMI onset, their response to …

Leadership Roles Of Native American Women In Education In The 1990s, Linda S. Keway

Dissertations

This study of Native American women leaders in education had a twofold purpose. The first was the primary objective of the study: to develop a greater understanding of leadership as experienced by contemporary Native American women. The second was to add to the literature on experiences of Native American women leaders. The method selected for this study was a qualitative approach involving ethnographic studies of 12 selected Native American women in the field of education. Data were collected through interviews and journal recordings. Native American women interviewed were representative of various tribes across the United States. The study explored questions …

Estimating Ibnr Reserves With Robust Statistics, Daniel Cheung

Dissertations

There is often a considerable time lag between an incurred of an accident, such as medical malpractice or product liability, and the time it is reported to the insurance company. These Incurred But Not Reported (IBNR) losses need to be predicted in order to determine the necessary loss reserves. Many actuarial methods have been developed for IBNR reserves estimation. However, none of the methods being used for loss reserving is robust to outliers, nor do they provide adequate statistical inferences to support the actuarial decisions. The rank-based method proposed in this thesis is robust to outliers, and provides statistical inference …

Groundwater-Kalamazoo River Interaction Near The Parchment City Wellfield, Parchment, Michigan, W. Richard Laton

Dissertations

A detailed hydrogeologic study of the Kalamazoo River and its interaction with the groundwater was completed near Parchment, Michigan. The Kalamazoo River between Portage Creek and Allegan Dam is a Federal superfund site due to PCB contamination trapped in its sediments. The City of Parchment pumps all of its drinking water from a glacial aquifer 850 feet from the Kalamazoo River. This study focused on the hydrogeology and groundwater/surface interaction of the area through the use of surface and downhole geophysics, installation of monitoring wells and peizometers, seepage meters and chemical sampling. It was determined that the Kalamazoo River is …

Effects Of Alternative Activities On Productivity Under Different Percentages Of Incentive Pay, Grainne A. Matthews

Dissertations

This study examined whether low percentages of incentive pay would be as effective as high percentages in maintaining work performance in the presence of competitive alternative activities. Incentives may increase performance primarily by decreasing time spent performing alternative activities. Although the link between performance and pay is tighter when the percentage of incentive pay is higher, laboratory studies have not found the expected difference. It is possible that previous simulations of work settings have not offered realistic competing contingencies. This study used a computer simulation of a quality inspection task and provided computer games as alternative activities to participants who …

Perceived Support For Change And Implementation Of Title I Of The Ada In Michigan’S Public School Districts, Truman S. Forest

Dissertations

Data for this study were gathered by survey from public school districts in the state of Michigan that employed more than one central office administrator. The survey was sent to human resource administrators as well as assistant superintendents and other central office administrators in 339 school districts. A total of 188 valid responses were received for a response rate of 55.8 percent.

The study tested five relational hypotheses. Ha1 through Ha4 were tested to determine if a relationship existed between the category of school district readiness to implement Title I of the Americans with Disabilities Act (ADA Readiness) and such …

Design, Simulation, Fabrication And Testing Of Microprobes For A New Mems Wafer Probe Card, Yanwei Zhang

Dissertations

A new type of MEMS cantilever wafer probe card consists of an array of microcantilevers individually actuated by bimorph heating to make contact with the test chip was designed and fabricated. This probe card is called the CHIPP (Conformable, High-Pin count, Programmable ) card and can be designed to contact up to 800 I/O pads along the perimeter of a 1 cm² chip with a microprobe repeat distance of ~50 µm. Each microcantilever had an internal heater and a separate electrode carrying the signal under test and contained four separate layers plus a fifth material for the contact tip …

Design Fabrication And Characterization Of High Performance In Gaas/Inp Focal Plane Array In The 1-2.6 Μm Wavelength Region, Krishna R. Linga

Dissertations

This research thesis describes a new In_xGa_1-xAs/InA_ysP_1-y/InP technology for long wavelength photodetectors and photodetector arrays. A unique and novel detector structure was designed and fabricated using Hydride Vapor Phase Epitaxy, for low leakage current photodetector arrays in the 1-2.6 µm wavelength region. Potential applications of InGaAs focal plane arrays include near-infrared spectroscopy, fluorescence, remote sensing, environmental sensing, space and astronomical applications. The unique design concepts included the step grading of InAsP layers, lower lattice mismatch between the two InAsP graded layers, lattice matched InAsP cap layer and InGaAs absorption layer, sulphur doping …

The Design And Fabrication Of A Thermal Microprobe Integrated On An Atomic Force Microscope Probe Tip, Yongxia Zhang

Dissertations

A thermal microprobe has been designed and built for high resolution temperature sensing. The thermal microprobe consists of a very-thin-film thermocouple junction confined to the very end of a low mass Atomic Force Microscope (AFM) probe tip. Essential to high resolution temperature sensing is the confinement of the thermocouple junction to a short distance at the AFM tip. This confinement is achieved by controlled photoresist coating.

Experimental prototypes have been made with the junction confined to within 0.3 µm of the tip. The couple is made of Au/Pd, and the two metals are electrically separated elsewhere by a thin insulating …

Efficient Parallel Processing With Optical Interconnections, Lili Hai

Dissertations

With the advances in VLSI technology, it is now possible to build chips which can each contain thousands of processors. The efficiency of such chips in executing parallel algorithms heavily depends on the interconnection topology of the processors. It is not possible to build a fully interconnected network of processors with constant fan-in/fan-out using electrical interconnections. Free space optics is a remedy to this limitation. Qualities exclusive to the optical medium are its ability to be directed for propagation in free space and the property that optical channels can cross in space without any interference. In this thesis, we present …

Distribution Of Velocities And Velocity Gradients In Mixing And Flocculation Vessels : Comparison Between Ldv Data And Cfd Predictions, Changgen Luo

Dissertations

Flocculation is an operation of significant industrial relevance commonly encountered in many processes, including water and wastewater treatment. The physico-chemical phenomena of this process is strongly affected by the magnitude of the velocity gradients generated, typically through agitation, in rapid mix devices and flocculation vessels.

In this work the fluid dynamic characteristics of mechanically agitated systems, namely three different types of stirred tanks, which can be used as flocculation vessels, were studied. Both the mean and fluctuating velocities in all three directions were measured by using a Laser-Doppler Velocimeter (LDV). The velocity distribution, fluctuating velocities, power consumption and local velocity …

Adaptive Space-Time Processing For Digital Mobile Radio Communication Systems, Amit Shah

Dissertations

The performance of digital mobile radio communication systems is primarily limited by cochannel interference and multipath fading. Antenna arrays, with optimum combining (OC), have been shown to combat multipath fading of the desired signal and are capable of reducing the power of interfering signals at the receiver through spatial filtering. With OC, the signals received by several antenna elements are weighted and combined to maximize the output signal-to-interference-plus-noise ratio (SLNR). We derive new closed-form expressions for (1) the probability density function (PDF) of the SINR at the output of the optimum combiner, (2) the average probability of bit error rate …

An Investigation Of The Oxygraphic Response Of Stressed Bovine Blood, Cristin Mckenna

Dissertations

Oxygraphic profiles of stressed bovine blood in a temperature controlled 2 ml reactor vessel provide the basis for an investigation of blood's response to various conditions. This response is broken down into an initial response (within 3 seconds), the response over 1 hour and the response over 24 hours. Fast-assay runs which investigate the initial response display a dose-response relationship when chemically stressed by phenol. Phenol concentrations in the 1,000 ppm range indicate a decrease in dissolved oxygen (DO) and higher phenol concentrations of over 20,000 an increase in DO. In addition to phenol concentration, other factors investigated with respect …

Multi-Wavelength Pyrometric Systems For Emissivity-Independent Non-Contact Temperature Sensing, Michael B. Kaplinsky

Dissertations

A Multi-Wavelength Imaging Pyrometer (M-WIP) for real-time remote sensing of temperature profiles of targets with unknown emissivity was developed and demonstrated. To measure the spectral radiance of a target at several distinct wavelengths an M-WIP system was implemented based on an 320x122-element PtSi IR-CCD imager with an assembly of 7 narrow-band 1k filters in the range from 1790nm to 4536nm. A real-time algorithm for simultaneous estimation of the temperature and model parameters of the target emissivity from the least-squares fit of the theoretical model of 1k camera output signal to the experimental spectral measurements was developed and implemented. This rea1-time …

Development Of A Mathematical Model Of Gait Dynamics, Tae Ho Choi

Dissertations

There exists hypothesis that gait selection is strongly correlated with mechanical energy efficiency in normal subjects. The hypothesis is experimentally proven, and intuitively taken for granted. However, it is not mathematically proven that the minimum energy consumption hypothesis is the underlying principle for the normal human gait. To prove the hypothesis we have developed a mathematical model of human walking, in which it is possible to predict an optimal gait at any given speed of walking based on the principle of minimum mechanical energy consumption.

This improved model, which includes the double-support phase of walking as well as the swing …

Particle Deposition From Turbulent Flow In A Divergent Channel, Wai-Ting Huang

Dissertations

This dissertation presents a numerical analysis of particle deposition from a dilute gas-solid two-phase suspension in a divergent channel. The Lagrangian governing equations for particle motion include inertia force, viscous force, gravity force and image force from electrostatic charge on the particle. The incompressible two-dimensional turbulent flow field in a divergent channel is solved by employing a Κ-ε modeling technique with FIDAP finite element CFD software. A computational procedure is developed to incorporate the flow field into numerical simulation of particle trajectories from which the fraction of deposition is determined. Several divergent channels (half divergent angles of 0°, 7.5°, 10° …

Scheduling In Assembly Type Job-Shops, Nutthapol Asadathorn

Dissertations

Assembly type job-shop scheduling is a generalization of the job-shop scheduling problem to include assembly operations. In the assembly type job-shops scheduling problem, there are n jobs which are to be processed on in workstations and each job has a due date. Each job visits one or more workstations in a predetermined route. The primary difference between this new problem and the classical job-shop problem is that two or more jobs can merge to foul' a new job at a specified workstation, that is job convergence is permitted. This feature cannot be modeled by existing job-shop techniques. In this dissertation, …

Motion Compensation And Very Low Bit Rate Video Coding, Shu Lin

Dissertations

Recently, many activities of the International Telecommunication Union (ITU) and the International Standard Organization (ISO) are leading to define new standards for very low bit-rate video coding, such as H.263 and MPEG-4 after successful applications of the international standards H.261 and MPEG-1/2 for video coding above 64kbps. However, at very low bit-rate the classic block matching based DCT video coding scheme suffers seriously from blocking artifacts which degrade the quality of reconstructed video frames considerably. To solve this problem, a new technique in which motion compensation is based on dense motion field is presented in this dissertation.

Four efficient new …

Performance Optimization Of Very High Frame Rate Ccd Burst-Image Sensors, Zeynep M. Pektas

Dissertations

The primary objective of this work was to demonstrate the feasibility of an image sensor that is capable of capturing images at 10⁷ frames per second. Such high frame rate operation is based on storage of a certain (N) number of frames into the BCCD memory registers and readout at a slower rate at the end of the frame collection period. To accommodate an optical frame time of 100ns, a high-speed virtual-gate photodetector with six multiple n-type implants was proposed and a novel design strategy was developed. The feasibility of this design was demonstrated by simulating the entire photodetector …

Multi-Wavelength Infrared Imaging Computer Systems And Applications, Jun Li

Dissertations

This dissertation presents the development of three computer systems for multi-wavelength thermal imaging.

Two computer systems were developed for the multi-wavelength imaging pyrometers (M-WIPs) that yield non-contact temperature measurements by remotely sensing the surface of objects with unknown wavelength-dependent emissivity. These M-WIP computer systems represent the state-of-art development in remote temperature measurement system based on the multi-wavelength approach. The dissertation research includes M-WIP computer system integration, software development, performance evaluation, and also applications in monitoring and control of temperature distribution of silicon wafers in a rapid thermal process system.

The two M-WIPs are capable of data acquisition, signal processing, system …

Modeling Of 3d Swept Volumes Using Sde/Sede Methods And Its Application To Five-Axis Nc Machining, Liping Wang

Dissertations

This research falls in two important areas in solid modeling and manufacturing automation: (1) swept-volume modeling; (2) computer-based NC (Numerically controled) machining simulation and verification. The swept volume is defined as the volume swept by an object undergoing an arbitrary motion. Modeling of 3D swept volumes includes the boundary computation and representation of a swept volume generated by a general object undergoing general motion in three dimensional space. The Sweep Differential Equation (SDE) and Sweep Envelope Differential Equation (SEDE) methods are two of the important swept volume modeling methods employed in this dissertation. They exploit differential equations to obtain the …

High Speed Protocols For Dual Bus And Dual Ring Network Architectures, Yaling Zhou

Dissertations

In this dissertation, two channel access mechanisms providing fair and bandwidth efficient transmission on dual bus and dual ring networks with high bandwidth-latency product are proposed. In addition, two effective priority mechanisms are introduced to meet the throughput and delay requirements of the diverse arrays of applications that future high speed networks must support.

For dual bus architectures, the Buffer Insertion Bandwidth Balancing (BI_BWB) mechanism and the Preemptive priority Bandwidth Balancing (P_BI_BWB) mechanism are proposed. BI_BWB can significantly improve the delay performance of remote stations. It achieves that by providing each station with a shift register into which the station …

Sampling And Analysis Of Trace Level Volatile Organic Compounds From Air Via Membrane Permeation, Naihong Zhu

Dissertations

The objective of this study is to develop air sampling techniques using membrane permeation. Two novel techniques for sampling and analysis of trace level VOCs from air via membrane permeation are presented:

1. selective concentration of VOCs into a canister using a membrane permeator;
2. on-line membrane extraction for direct introduction of VOCs from air emissions into a gas chromatograph.

In the membrane permeator-canister sampling system (MPCS), the air sample containing trace level VOCs as well as some interferences such as moisture are passed through the membrane module. Polydimethyl siloxane membrane used in this research is highly permeable to organic compounds, but …

On Document Filing Based Upon Predicates, Zhijian Zhu

Dissertations

This dissertation presents a formal approach to modeling documents in a personal office environment, proposes a heterogeneous algebraic query language to manipulating objects (folders) in the document model, and investigates a predicate-driven document filing system for automatically filing documents.

The document model was initially proposed in [38] which adopts a very natural view for describing the office documents using the relational and object-oriented paradigms. The model employs a dual approach to classifying and categorizing office documents by defining both a document type hierarchy and a folder organization. This dissertation extends and specifies formally the document model. Documents are partitioned into …

Membrane-Based Reactors For Ozonolysis Of Organic Pollutants In Aqueous And Gaseous Streams, Purushottam V. Shanbhag

Dissertations

Many gaseous and aqueous waste streams contain multiple organic pollutants at low concentration levels. It is not economical to recover and reuse these compounds; it would be advantageous to destroy them efficiently within the waste stream. This work employed ozone, a powerful oxidizing agent, in concert with a compact membrane-based phase-contacting device. Three types of membrane devices were studied: two of them (the single-phase membrane ozonator and the two-phase membrane ozonator) treated organic pollutants in wastewater, while the third (the integrated absorption-oxidation membrane ozonator) removed volatile organic compounds (VOCs) from a gaseous waste stream.

In the single-phase membrane ozonator, the …