Digital Commons Network^™

Estimating The Size Of The Informal Sector In Latin America, George T. Lesica

Masters Theses

The informal sector has always been assumed to exist but was not studied intently until the 1970s when economic events in the US and Europe led scholars to consider just how much economic activity was occurring but not being accounted for. Since that time it has been studied more vigorously but very little progress has been made in understanding it.

In this paper I develop estimates of the size of the informal sector using two different methods. First, a panel of estimates for several Latin American countries will be constructed using the Multiple Indicators Multiple Causes (MIMIC) method for several …

Forecasting Exchange Rates Using Neural Networks: A Trader's Approach, Adam Stokes

Masters Theses

This study is to investigate the use of Artificial Neural Networks (ANN) for forecasting exchange rates. The currencies examined in the paper are the Euro, Pound, and Yen. Two different types of ANNs are used in this paper: Feedforward and Nonlinear Autoregressive with Exogenous Input (NARX). Forecasts are made for daily and weekly exchange rates using the open, high, low, and close of the exchange rates. Many standard econometric models cannot deal with daily and weekly forecasts due to many macro economic variables not being available at such frequencies. ANNs are able to deal with daily and weekly data as …

Behavioral Risk Factors Of Non-Suicidal Self-Injurious Behavior In A Community Sample Of Adolescents, Sarah Ritter

Masters Theses

This study examined group differences of non-suicidal self-injury (NSSI) in adolescents on four behavioral risk factors: risk behaviors, peer victimization, substance use, and weight related behaviors. It was hypothesized that adolescents who engaged in NSSI within the past year would endorse more risk behaviors than adolescents who did not engage in NSSI. It was further hypothesized that the higher the frequency with which an adolescent engaged in NSSI, the more risk factors they would report. Frequency was divided into three groups: "more frequently" (6 + times in the past year), "less frequently" (1-5 times in the past year) and "no …

Methodology For Evaluating Statistical Equivalence In Face Recognition Using Live Subjects With Dissimilar Skin Tones, Bryan Baker

Masters Theses

The question sought in this study is whether there is a significant statistical difference between a facial recognition system's ability to recognize dark or light skin tone subjects. In addition to the direct comparison of results from two different populations, this study also examines four factors commonly effecting facial recognition systems. The four factors tested were angle of the camera viewing the subject; both horizontally to the left and right, as well as vertically, both above and below the subject's line of sight.

Additionally, the distance the subjects are from the camera, and then intensity of the illumination on the …

Vocabulary Acquisition Through Fast Mapping In Children With Autism, Lynne Barcus

Masters Theses

Fast mapping is a cognitive process that facilitates acquisition of new vocabulary through brief exposures to words and their referents. Research has shown that typically developing children and those with Down syndrome, specific language impairment, or mental impairment acquire new vocabulary through fast mapping, although with different levels of success. This study explored the effectiveness of fast mapping to facilitate vocabulary acquisition in children with autism. A multiple baseline across subjects design was employed with four children with autism. After a pre-test to determine which food and animal objects were unfamiliar to each subject, a series of fast mapping trials …

Finding The Path Within The "Ego Tunnel": A Buddhist Approach To Tackling The Problems Of A Western Self, Bryan James Hinman

Masters Theses

If many of the problems associated with a Western sense of self stem from its penchant for distorting reality, it follows that to free ourselves from its grasp we would need to implement an alternative way to view our experience accurately, such as that described in the Buddhist doctrine of no-self. The dangers of becoming attached to the Western self are outlined, as well as the means of transcending them through accurate self-assessments gained from insights of no-self. In addition, considerable research is reviewed that supports this idea by suggesting that Western constructs similar to no-self, like the "quiet" ego, …

Relationship Between Indirect Aggression And Social Anxiety In A College Sample, Jennifer A. Kusy

Masters Theses

Indirect aggression, a nonphysical form of aggression, has received increased attention in research because of the manipulative nature of the act. While it usually occurs during the preadolescent and adolescent years, research has started to examine its effects in young adult and adult populations. This study examined the link between indirect aggression and social anxiety and social avoidance in a sample of college students. Four distinct groups of aggressors were identified (perpetrator, victim, both, neither), with the majority of students indicating they have had no experience with indirect aggression. Results indicated that those who experienced indirect aggression in some form …

Effects Of Statewide Training On Functional Behavioral Assessment (Fba) Knowledge, Kendra L. Brading

Masters Theses

Positive behavioral interventions and supports (PBIS) is a 3-tiered approach to eliminating problem behaviors by replacing them with appropriate behaviors. PBIS implementation differs depending on the tier. Implementation at Tier 1 focuses on school-wide prevention of problem behaviors. Tier 2 involves diminishing current problem behavior cases at the classroom-level. In Tier 3, a functional behavioral assessment (FBA) is conducted, which evaluates the problem behaviors and determines antecedents and consequences of the behaviors so that an intervention can be planned. Training educators to conduct FBAs is linked to appropriately and accurately implementing FBAs. This study examined pre and posttest scores to …

Mentor Perceptions Of Closure In Formal Youth Mentoring Relationships, Anna Maria Peterson

Masters Theses

In formal community-based youth mentoring relationships, mentors and mentees travel through phases of a relationship from inception through closure. To form an understanding of mentor perceptions of the closure phase of those relationships, a Glaserian grounded theory survey was conducted. Mentors located in central Illinois participated in the survey providing their perceptions, insights and experiences regarding the closure phase of the youth mentoring relationships in which they were involved.

Key Factors Affecting Color Reproduction On T-Shirt Fabrics Using Heat Transfer Printing, Molly Frank

Masters Theses

Dye sublimation heat transfer printing is commonly used to transfer an image to fabric for small production runs. This process is very inexpensive and is very quick. Unlike digitally printing on fabric, there is no need to treat the fabric once the image has been transferred onto it. Heat transfer printing is also commonly used due to the fact that three different factors can be controlled while printing. These three factors are the temperature, the dwell time, and the pressure. Color reproduction is easy to do once the correct combination of these three factors is found. The temperature, time, and …

Freshmen Perceptions Of Academic Support In The Residence Halls, Katherine E. Schmidt

Masters Theses

The purpose of this study was to explore the perceptions of freshmen students on the subject of academic support in the residence halls. Prior research in the field indicated there are many different approaches to academic support in the residence halls such as the professional and resident assistant staff, academic programming as well as the physical environment, and exploring living learning community programs. The prior research also indicated the need to identify the unique millennial generational needs as well as the goals of integrative learning. A qualitative study was conducted in three focus group settings to gain an understanding of …

Calcium Wire Ladle Treatment To Improve Cleanliness Of Centrifugal Cast Steel, Edith Yolanda Martinez Silva

Masters Theses

"Centrifugal casting provides the opportunity of combining large centrifugal forces and directional solidification to reduce non-metallic inclusions in the cast steel product. Calcium treatment in the ladle has the potential of reducing and modifying non-metallic inclusions to achieve better machinability and mechanical properties. The objective of this research is to analyze the combined effects of calcium wire ladle treatment and centrifugal casting on the number, size, composition and morphology of non-metallic inclusions in centrifugally cast steel products.

All experiments were completed at an industrial foundry. The experiments involved feeding calcium wire into the ladle after argon oxygen decarburization (AOD) and …

Towards On-Line Voltage Stability Assessment Using Synchrophasors, Himanshu Subandhu Hirlekar

Masters Theses

"Voltage instability has become a growing concern in the operation of power systems in recent years. The reason is that power systems all over are being operated with reduced margins because of increased demand exacerbated by a general reluctance to invest in improvement of the electric grid infrastructure. Until recently it was difficult to predict voltage instability in the on-line environment. However, advances in technology has made possible the on-line monitoring and assessment of voltage stability. Synchrophasors is a relatively new technology in the field of power systems which allows system operators to monitor the system conditions at specific measurement …

Field Programmable Gate Array Based Multiple Input Multiple Output Transmitter, Richa Shekhar

Masters Theses

"MIMO is an advanced antenna technology compared to Single Input Single output (SISO), Multiple Input Single Output (MISO), and Single Input Multiple Output (SIMO) and is used to obtain high data rate in the system. Multiple-Input Multiple-Output (MIMO) systems have at least two transmitting antennas, each generating unique signals. However some applications may require three, four, or more transmitting devices to achieve the desired system performance. This thesis describes a comparison between different approaches like the microcontroller, ASICs and the FPGA available in the market for baseband signal generation. It also describes the design of a scalable MIMO transmitter, based …

Longitudinal Evaluation Of A Learning System For Teaching Geographical Information System Within The Context Of A Geotechnical Problem, Aparna Sukhavasi

Masters Theses

"A learning system, to train civil engineering students to apply Geographical Information Systems (GIS) in geotechnical problems, was evaluated over a period of 5 years, hence longitudinal. The system was tested with a series of iterations consisting of usability tests and subsequent modification, which were followed by a series of applied evaluations within the context of class lab sessions. The principal goals of this evaluation were to determine the overall effectiveness of the system and the factors that affected student learning. The first evaluation was conducted in 2004; and included a control group that played a "game" related to the …

Impact Of Combustion Phasing On Energy And Availability Distributions Of An Internal Combustion Engine, Shawn Nicholas Wildhaber

Masters Theses

"High fuel efficiency has become an extremely desirable trait for internal combustion engines. This motivation has driven extensive research on methods to improve fuel efficiency on engines of various sizes. Many of these methods involve changes to the properties of the combustion process. One way to induce these property changes is through varying the phasing of combustion. Combustion phasing can be defined as the time in the engine cycle, specifically the compression and expansion strokes, where combustion occurs. A change in combustion phasing causes a change in combustion duration. The duration of combustion impacts how the energy and work potential …

Uncertainty Quantification Integrated To Computational Fluid Dynamic Modeling Of Synthetic Jet Actuators, Srikanth Adya

Masters Theses

"The Point Collocation Non-Intrusive Polynomial Chaos (NIPC) method was applied to a stochastic synthetic jet actuator problem to demonstrate the integration of computationally efficient uncertainty quantification to the high-fidelity CFD modeling of Synthetic Jet Actuators. The uncertainty quantification approach was first implemented in two stochastic model problem cases for the prediction of peak exit plane velocity using a Fluid Dynamic Based analytical model of the Synthetic Jet Actuator, which is computationally less expensive than CFD simulations. The NIPC results were compared with direct Monte Carlo sampling results. To demonstrate the efficient uncertainty quantification in CFD modeling of synthetic jet actuators, …

Characterization Of Shielding Effectiveness For Metallic Enclosures, Nicholas Bennett Mentesana

Masters Theses

"This topic discusses and verifies an equation for estimating the shielding effectiveness of metallic enclosures through the use of numerical simulations. Using ideas from Bethe's "Theory of Diffraction by Small Holes", a previous student from the Missouri S&T Electromagnetic Compatibility Laboratory developed an equation that would yield an envelope prediction for the worst-case EMI from an aperture array backed by an over-moded cavity. Min Li (PhDEE '99) used results from measurements, simulations, and physics-based equations to formulate a simple equation that would predict these EMI levels. The main purpose of this thesis is to revisit this work and determine when …

Effects Of A Nickel Reactor Liner And Other Reaction Variables During Supercritical Water Reformation Of Glycerin, Michael S. Stever

Masters Theses

"The non-catalytic reformation of glycerin using supercritical water was conducted in a 400-mL tubular reactor constructed of Haynesʼ Alloy 230. The evaluated parameters for this thesis include water-to-glycerin molar ratios ranging from 3 to 24 and reactor temperatures ranging from 500⁰C to 700⁰C. In addition, experiments were performed using the Haynes' Alloy 230 reactor both without a liner and with a Nickel 201 liner. Space time was maintained at approximately 100 seconds and the reactor pressure was kept constant at 24.1 MPa. The resultant effect on product gas composition and carbon gasification was determined. The product gases consisted of a …

Managing A Solar Sensor Array Project: Analyzing Insolation & Motivation, Beth A. Yount

Masters Theses

"The renewable power industry is rapidly growing today and is in need of much data to augment the advancement of the field. Photovoltaic technology, while making substantial improvement over the last 60 years, still has some significant hurdles to overcome. When shading, dust, or damaged cells reduce the power output of one panel, the traditional series-parallel configurations make it so every panel in series with that lower current panel, will also have its current lowered; this lowers the overall power output of the array significantly. Advancements in configurations and converters could change this phenomenon and dramatically increase a solar array's …

Mutation Of The Hof1 Pest Domain Affects Cytokinesis In Budding Yeast, Katherine E. Stockstill

Masters Theses

"Cytokinesis is the division of a cell into two daughter cells. Cytokinesis failure results in polyploidy, which may contribute to tumorigenesis or cause cell death. The Saccharomyces cerevisiae protein Hof1, which is required for efficient cytokinesis, is phosphorylated during mitosis. The hypothesis that MEN (mitotic exit network) dependent phosphorylation regulates Hof1 degradation, triggering completion of cytokinesis was tested. Hof1 contains a PEST sequence, which is rich in proline, glutamic acid, serine, and threonine, and is believed to be involved in protein degradation. To test the hypothesis, we created two non-phosphorylatable mutants of the Hof1 PEST domain tagged with GFP. The …

Optimization Of Textual Affect Entity Relation Models, Ajith Cherukad Jose

Masters Theses

"Affective computing is a recent research area in computer science which deals with the design and development of systems that can recognize, interpret and process human affects/emotions. Various research projects in the past have focused on affect sensing and processing raw textual data. One such research effort conducted at the Oak Ridge National Laboratory (ORNL) has introduced an affect propagation algorithm which can generate affective relationships between entities contained in a given textual document. The algorithm depends upon a set of real-valued numeric parameters for which the best possible values are unknown. This thesis describes three different contributions to ORNL's …

Rapid Simulation Of The Statistical Variation Of Crosstalk In Cable Harness Bundles, Xiang Li

Masters Theses

"Accurate assessment of crosstalk problems in cable harnesses requires simulation methods that account for the statistical variation of harness parameters. Methods are proposed to determine the influence of the statistical variation in wire positions, the rate that wires change position (i.e. "twist"), harness height, harness density (i.e. how closely wires are packed) and circuit loads. Methods use a combination of simulation and probability theory. Simulations use the T-parameter method, a rapid simulation technique for harness bundles. Simulation time is further improved by using the mean and variance of crosstalk estimated for fixed harness parameter values to estimate the mean and …

Location Privacy Policy Management System, Arej Awodha Muhammed

Masters Theses

"The advance in wireless communication and positioning systems has permitted development of a large variety of location-based services that, for example, can help people easily locate family members or find nearest gas station or restaurant. As location-based services become more and more popular, concerns are growing about the misuse of location information by malicious parties. In order to preserve location privacy, many efforts have been devoted to preventing service providers from determining users' exact locations. Few works have sought to help users manage their privacy preferences; however management of privacy is an important issue in real applications. This work developed …

Heat Transfer Augmentation In Rectangular Ducts Due To Passive Flow Destabilization, James Jackson Tinsley

Masters Theses

"The following thesis documents the comparison of surface enhancements in rectangular ducts for heat transfer enhancement of the air-side of off-road heat exchangers. Two sets of experiments were completed, one utilizing air as the working fluid, and the other utilizing water. Five air geometries and four water geometries were studied, including those with crosswise bumps, longitudinal vortex generators, and a unique rifling geometry. A smooth test section was also tested in the water experiments to verify the experimental setup. Such verification had been performed previously for the air experiments by Rucker [2007]. The experiment involved an applied constant heat flux …

Scholarship In International Technical Communication, 1950-1989: A Historical Study, Xiaoyan Huang

Masters Theses

"This thesis is a study of the published scholarship in international technical communication from 1950 to 1989. It provides insight into the four decades' worth of scholarship as well as a resource for the development of present and future scholarship in international technical communication. It attempts to answer the following research questions: What did scholars of international technical communication study in each decade? What are the similarities and differences among the four decades in terms of scholarship in international technical communication? What are the strengths and weaknesses of the relevant scholarship in the four decades? What can we learn from …

Density Determination Of Tristructural-Isotropic Nuclear Fuel Using Multiple Projection X-Ray Radiography, Frank Angelo Strantz

Masters Theses

"Effective methods of enhancing the safety and efficiency of the nuclear power industry embolden its perception and economic viability. Fuel reliability is an essential component of the prosperity of next generation high temperature reactors; as such, an equally dependable quality control method is mandatory. Tristructural-isotropic (TRISO) fuel, the fuel developed for use in these reactors, utilizes density measurement of coating layers as a standard for quality control. Common methods of measuring density, such as sink-float and ceramography are destructive, and as such generate radioactive waste, take a relatively long time to prepare samples, rely on a low sampling rate to …

The Sorption Of Chemical And Nuclear Contaminants From Soil And Water Using Nanosize Particles Of Hydroxyapatite, Chyrene Joseph

Masters Theses

"High surface area (>200 m²/g) crystals composed of nanosize (30-50nm) hydroxyapatite; (Ca₅(PO₄)₃OH) particles are being investigated as an alternative in cleaing [sic] contaminated groundwater and soil by removing toxic wastes and radionuclides. Static batch tests were carried out at 2, 4, 8, 24 and 120 hour time periods by reacting hydroxyapatite with individual solutions prepared with specific elements to evaluate the applicability of hydroxyapatite in removing potential contaminants. Chemical analyses on leachant solutions, leachate solutions, and post-reaction digested solids were conducted by Inductively Coupled Plasma-Mass Spectroscopy to determine the extent of ion removal. Removal of these ions is expected …

Continuous Low Thrust For Small Spacecraft Proximity Operations, James Harris Meub

Masters Theses

"Recently, both DoD and NASA have demonstrated increased interest in the development of close proximity operations for space systems. AFRL's Advanced Sciences and Technology Research Institute for Astrodynamics (ASTRIA) has defined several key research topics relevant to military priorities, with one area of critical importance being the inspection and observation of low Earth orbit resident space objects (RSOs). This study investigates the feasibility of using a low-thrust cold-gas propulsion system to effectively and accurately facilitate resident space object inspection. Specifically, this study focuses on the Missouri S&T Satellite mission (M-SAT) as a means to demonstrate autonomous RSO inspection. This paper …

Processing And Mechanical Characterization Of Polyurea Aerogels, Jared M. Loebs

Masters Theses

"The use of aerogels historically has been limited to extreme cases largely in part to the nature of their mechanical properties. Until recently many aerogels produced have been brittle and weak, though looking at their specific strength would suggest otherwise. This thesis outlines the processing and major mechanical properties of a relatively new type of aerogel, polyurea aerogel, that shows promise in a variety of fields including structures.

Processing polyurea aerogel begins with a liquid solution that solidifies to form a solid gel filled with liquid that is later removed by supercritical drying. Once dry, polyurea aerogels are difficult to …