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Title: Deadly Premonition: Does Terrorist-Leader Psychology Influence Violence Lethality?.
Creator: Besaw, Clayton, Schafer, Mark, Jacques, Peter, Mousseau, Michael, University of Central Florida
Abstract / Description: This thesis seeks to address a theoretical and empirical gap within terrorism studies, and more specially the study of terrorist-group lethality. This research updates a model of terrorist-group lethality by including terrorist-leader psychology as an individual-level variable in predicting terrorist-group lethality. Terrorist-leader statements were analyzed by using two novel coding schemes called Operational Code and Leadership Trait Analysis to create quantified measurements of leader...
Show moreThis thesis seeks to address a theoretical and empirical gap within terrorism studies, and more specially the study of terrorist-group lethality. This research updates a model of terrorist-group lethality by including terrorist-leader psychology as an individual-level variable in predicting terrorist-group lethality. Terrorist-leader statements were analyzed by using two novel coding schemes called Operational Code and Leadership Trait Analysis to create quantified measurements of leader cognitive beliefs and personality traits. The empirical portion of this study utilizes pooled cross-sectional time-series data within the framework of fixed effects and multi-level estimation models. The results find that terrorist-leader psychology, and more specifically Instrumental (Strategic) Beliefs and Distrust, are significant predictors of subsequent group-lethality.
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Date Issued: 2014
Identifier: CFE0005132, ucf:50679
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005132

Title: THE DEVELOPMENT OF A FUZZY MODEL TO QUANTIFY TRAINING ANDEDUCATIONAL FACTORS AND THE RESULTING IMPACT ON STUDENT SUCCESSAND LEARNING.
Creator: Butler, Chandre, McCauley-Bell, Pamela, University of Central Florida
Abstract / Description: The utilization of fuzzy mathematical modeling for quantification of the quality of training and educational delivery is an innovative application that can result in measurable and repeatable results. This research was designed to apply proven quantification techniques and Industrial Engineering methodologies to a nontraditional environment. The outcomes of this research provide the foundation, initial steps and preliminary validation for the development of a systematic fuzzy theoretical...
Show moreThe utilization of fuzzy mathematical modeling for quantification of the quality of training and educational delivery is an innovative application that can result in measurable and repeatable results. This research was designed to apply proven quantification techniques and Industrial Engineering methodologies to a nontraditional environment. The outcomes of this research provide the foundation, initial steps and preliminary validation for the development of a systematic fuzzy theoretical model to be applied for the quantification of various areas within training and education delivery. The test bed for this methodology is Orange County Public School system, the twelfth largest school district in the nation. The organizational and operational factors of a large school district are highly compatible with Systems Engineering concepts. The debate over education reform has drawn from referenced areas within the Industrial Engineering community including quality, continuous improvement, benchmarking and metrics development, data analysis, and scientific/systemic justification requirements. In spite of these applications, the literature does not reflect a consistent and broad application of these techniques in addressing the evaluation and quantification of educational delivery systems. This research draws on the previously listed areas within Industrial Engineering to apply these techniques to enhance the understanding and promote quantification of the multiple factors acting on the educational delivery system. The importance of addressing these issues is a national concern given the significant changes in the United States educational delivery system. For example, over the past 40 years there has been a more than three-hundred percent increase in per-pupil appropriations yet the academic performance gains have been limited and the quantification and measurement of those gains is even more limited. This body of work willidentify the systems, sub-systems, system factors, and factor degrees of existence necessary to quantify and measure these performance changes. Finally, the research will quantify the inputs and produce a model that provides a numeric value that represents the condition of the system and various subsystems of an educational system.
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Date Issued: 2005
Identifier: CFE0000890, ucf:46640
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000890

Title: QUANTITATIVE THICKNESS MAPPING IN HIGH-ANGLE ANNULAR DARK-FIELD (HAADF) SCANNING TRANSMISSION ELECTRON MICROSCOPY (STEM).
Creator: Nukala, Haritha, Heinrich, Helge, University of Central Florida
Abstract / Description: Only a few methods are currently available for the measurement of sample thicknesses in Transmission Electron Microscopy (TEM). These methods, Convergent-Beam Electron Diffraction (CBED) and thickness mapping in Energy-Filtered TEM (EFTEM), are either elaborate or complex. In this present work, I have investigated and come up with a simple straight-forward method to measure the local thickness of a TEM sample with the atomic number (Z-contrast) imaging using High-Angle Annular Dark Field ...
Show moreOnly a few methods are currently available for the measurement of sample thicknesses in Transmission Electron Microscopy (TEM). These methods, Convergent-Beam Electron Diffraction (CBED) and thickness mapping in Energy-Filtered TEM (EFTEM), are either elaborate or complex. In this present work, I have investigated and come up with a simple straight-forward method to measure the local thickness of a TEM sample with the atomic number (Z-contrast) imaging using High-Angle Annular Dark Field (HAADF) Scanning Transmission Electron Microscopy (STEM). HAADF STEM shows atomic number contrast for high scattering angles of the electrons, owing to predominant electron scattering at the potential of the nucleus similar to Rutherford scattering. The characterization of materials by STEM helps to identify microstructures and nanostructures within a sample and to analyze defects in samples. HAADF STEM imaging is capable of resolving atomic structures with better than 2 Å lateral resolution. However, HAADF STEM has so far not been systematically used to measure sample thicknesses. In Z-contrast imaging, it was known that the intensity of the electrons scattered to high angles increases with increase in the atomic number (Z) of the element/compound with increasing thickness of the sample based on the equation, I ~ t.Zα Where t, is the thickness and α, is a parameter between 1 and 2. This project was started with this simple approach, but the experimental results within the thesis show that the relation between the intensity and the atomic number is not well described by this equation. A more reliable parameter, σZ, the interaction coefficient of the material was calculated. Samples containing Ag2Al platelets in Al matrix were used for calibration purposes. Additional samples containing layers of known elements/compounds were obtained from TriQuint Semiconductors and from the Physics department of UCF to calculate σ for various elements/compounds. These experimental values were used to measure the local thicknesses in nanoparticles and also the total volume of the nanoparticles. This quantitative HAADF STEM analysis represents a new method, which can be added to the list of methods used for the purpose of measurement of the local thickness of a sample in the TEM. This method is especially useful for the thickness measurement of nanoparticles. The other two methods, CBED and thickness maps in EFTEM are strongly affected by the sample orientation and therefore not appropriate for the study of nanoparticle thicknesses, whereas orientation effects are negligible for the conditions used in this HAADF STEM analysis.
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Date Issued: 2008
Identifier: CFE0002309, ucf:47859
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002309

Title: The Invisible Men: Analyzing the Virtual Subculture of England's Punters.
Creator: Christensen, Ashley, Huff-Corzine, Lin, Corzine, Harold, Reckdenwald, Amy, Bain, Andrew, University of Central Florida
Abstract / Description: Research on prostitution has flourished over the last few decades with a new emphasis on the online sex market. To study the online market, researchers have utilized qualitative methods to investigate escort review websites. Coding for violent rhetoric and perceived intimacy are two conventional techniques that have been utilized using qualitative methods. Other areas investigated include the overall characteristics of sex buyers, price variation, and socialization of buyers. What has lacked...
Show moreResearch on prostitution has flourished over the last few decades with a new emphasis on the online sex market. To study the online market, researchers have utilized qualitative methods to investigate escort review websites. Coding for violent rhetoric and perceived intimacy are two conventional techniques that have been utilized using qualitative methods. Other areas investigated include the overall characteristics of sex buyers, price variation, and socialization of buyers. What has lacked in current literature has been the use of quantitative methods to study what factors influence the presence of positive reviews. To expand on limited existing literature utilizing quantitative methods, the current study used data from an escort review website titled Punternet.com for the years 2015 through 2017. Punternet is a public website where sex buyers (punters in the UK) can review sex workers and discuss aspects of sex buying culture in community forums. Factors that influence the presence of positive reviews were investigated including various sexual acts (oral, anal, vaginal, manual, group sex), session variables (length, cost, location, climax, condom usage, and intimacy), and a factor related to the type of sex worker (escort). Symbolic interactionism theory was used to explain the presence of intimacy within the reviews. The results from a binary logistic regression indicate that a variety of different factors are significant in regard to influencing the presence of positive reviews. For example, the odds that positive reviews occurred were increased when intimacy, or perceived intimacy, occurred throughout the sessions and whether at least one climax occurred. Future research in this area should continue to use quantitative methods to investigate what factors influence intimacy within the sessions, due to the high significance finding in the present research.
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Date Issued: 2019
Identifier: CFE0007614, ucf:52517
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007614

Title: The effect of race, skin color, religion and national origin on duration of processing for permanent resident visas.
Creator: Bares, Lindsey, Wright, James, Pals, Heili, Rivera, Fernando, University of Central Florida
Abstract / Description: A great deal of attention has recently been focused on America's undocumented immigrants, a population estimated at around 10 million people (Passel, Capps, and Fix 2004). Much less attention has been paid (in both scholarly and academic circles) to legal immigrants, although in 2010 (the most recent year for which complete data are available), the Department of Homeland Security granted 1,042,625 permanent resident visas. Indeed, since 1994 when the government began to publish the Annual...
Show moreA great deal of attention has recently been focused on America's undocumented immigrants, a population estimated at around 10 million people (Passel, Capps, and Fix 2004). Much less attention has been paid (in both scholarly and academic circles) to legal immigrants, although in 2010 (the most recent year for which complete data are available), the Department of Homeland Security granted 1,042,625 permanent resident visas. Indeed, since 1994 when the government began to publish the Annual Flow Report, we have granted between 700,000 to around 1,300,000 new legal immigrant visas annually.Legal immigration into the US involves a process of varying length. That is to say, the elapsed time between applying for a permanent resident's visa and being granted that visa can range from as little as a few months to as long as several years. It is known that the type of visa being applied for (the various types are explained later) accounts for some of the variation in processing length, and also that lost paperwork is a significant factor (Jasso 2011). This study found no evidence of discrimination in regards to the race, skin color, and religion of the survey respondents in terms of the time it took to get their visas processed. The average wait time for visa processing was about 5 years; Mexicans and Filipinos waited longer than immigrants from other countries.For various reasons discussed in the text, our current immigration system has created a two-tiered family-based immigrant visa system. That is, the system gives heavy preference to family members of persons who are already legal immigrants. The preferential status of so-called family reunification visas has been a point of controversy in immigration advocacy circles and that controversy is also reviewed.
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Date Issued: 2012
Identifier: CFE0004355, ucf:49427
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004355

Title: A Place in the Pew: Lesbian, Gay, and Bisexual Individuals' Perceptions of Religious Traditions.
Creator: Barringer, Mandi, Gay, David, Jasinski, Jana, Corzine, Harold, University of Central Florida
Abstract / Description: Research shows that sexual minorities have been criticized and rejected by nearly every major religious group in the United States. The cumulative alienation that sexual minorities experience from mainline religious groups may leave them feeling disillusioned and even hostile toward religious organizations which have historically rejected them. However, research to date has not explored sexual minorities' perceptions of religious collectives in the United States. The current study examines...
Show moreResearch shows that sexual minorities have been criticized and rejected by nearly every major religious group in the United States. The cumulative alienation that sexual minorities experience from mainline religious groups may leave them feeling disillusioned and even hostile toward religious organizations which have historically rejected them. However, research to date has not explored sexual minorities' perceptions of religious collectives in the United States. The current study examines the variations between lesbian, gay, and bisexual (LGB) individuals regarding their religious beliefs and perceptions of religious collectives' attitudes toward the LGB and transgender (LGBT) population. Utilizing data from the 2013 Pew Research Center of LGBT adults, I conduct four separate binary logistic regression analyses examining evangelical Protestant churches', the Catholic Church's, the Jewish religion's, and mainline Protestant churches' acceptance of the LGBT population. The findings from this study offer rare insight from the perspectives of LGB individuals regarding four major religious collectives and illustrates that sexual minorities do indeed have a complex relationship with religious groups. Ultimately, the findings from this research demonstrate the importance of further examining sexual minorities' attitudes and interactions with religious collectives.
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Date Issued: 2017
Identifier: CFE0006718, ucf:51881
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006718

Title: Pooling correlation matrices corrected for selection bias: Implications for meta-analysis.
Creator: Matthews, Kenneth, Sivo, Stephen, Bai, Haiyan, Hahs-Vaughn, Debbie, Butler, Malcolm, University of Central Florida
Abstract / Description: Selection effects systematically attenuate correlations and must be considered when performing meta-analyses. No research domain is immune to selection effects, evident whenever self-selection or attrition take place. In educational research, selection effects are unavoidable in studies of postsecondary admissions, placement testing, or teacher selection. While methods to correct for selection bias are well documented for univariate meta-analyses, they have gone unexamined in multivariate...
Show moreSelection effects systematically attenuate correlations and must be considered when performing meta-analyses. No research domain is immune to selection effects, evident whenever self-selection or attrition take place. In educational research, selection effects are unavoidable in studies of postsecondary admissions, placement testing, or teacher selection. While methods to correct for selection bias are well documented for univariate meta-analyses, they have gone unexamined in multivariate meta-analyses, which synthesize more than one correlation from each study (i.e., a correlation matrix). Multivariate meta-analyses of correlations provide opportunities to explore complex relationships and correcting for selection effects improves the summary effect estimates. I used Monte Carlo simulations to test two methods of correcting selection effects and evaluate a method for pooling the corrected matrices. First, I examined the performance of Thorndike's corrections (for both explicit and incidental selection) and Lawley's multivariate correction for selection on correlation matrices when explicit selection takes place on a single variable. Simulation conditions included a wide range of selection ratios, samples sizes, and population correlations. The results indicated that univariate and multivariate correction methods perform equivalently. I provide practical guidelines for choosing between the two methods. In a second Monte Carlo simulation, I examined the confidence interval coverage rates of a Robust Variance Estimation (RVE) procedure when it is used to pool correlation matrices corrected for selection effects under a random-effects model. The RVE procedure empirically estimates the standard errors of the corrected correlations and has the advantage of having no distributional assumptions. Simulation conditions included tau-squared ratio, within-study sample size, number of studies, and selection ratio. The results were mixed, with RVE performing well under higher selection ratios and larger unrestricted sample sizes. RVE performed consistently across values of tau-squared. I recommend applications of the results, especially for educational research, and opportunities for future research.
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Date Issued: 2019
Identifier: CFE0007680, ucf:52483
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007680

Title: Can a Multiple Intervention Approach Improve College Students' Persistence, GPA, and Credits Earned?.
Creator: Guillemette, Joshua, Sivo, Stephen, Swan, Bonnie, Hahs-Vaughn, Debbie, Vitale, Thomas, University of Central Florida
Abstract / Description: The research conducted tested a theory based on work by Tinto (1999), Astin (1984), and the Center for Community College Student Engagement (CCCSE, 2012) that multiple interventions are needed to significantly improve graduation rates at community colleges. The literature says little about this approach for community college students; therefore, this dissertation contributes to the knowledge base for educational programs.A first-year program at a large, diverse community college using...
Show moreThe research conducted tested a theory based on work by Tinto (1999), Astin (1984), and the Center for Community College Student Engagement (CCCSE, 2012) that multiple interventions are needed to significantly improve graduation rates at community colleges. The literature says little about this approach for community college students; therefore, this dissertation contributes to the knowledge base for educational programs.A first-year program at a large, diverse community college using multiple interventions assisted in determining the validity of the theory. The interventions built into the first-year program included learning communities, a student success course (SSC), proactive advising, and experiential learning. The CCCSE and others identified these components as high-impact practices for improving student achievement. A common theme and faculty tied interventions together across the first year of the program. The small sample (n = 21) and the fact this was the pilot year represent the most critical limitations in ascertaining the efficacy of the theory.The program's outcomes were evaluated using propensity score matching (PSM). Updates in statistical software continue to make the method easier to implement and evaluate. Consequently, this method is increasing in popularity in education to determine causality where random assignment is not feasible. Hence, the dissertation spends some time describing the method, so others can benefit from the method in their research. The author compared the program group to matched students from the same campus in the fall and spring terms. Characteristics of the match were chosen based on a careful search of the literature and historical data of the institution to ensure that students in the match group would be comparable. Differences in persistence, grade point average (GPA), and credits earned served to determine the effectiveness of the theory in this pilot.The program did not show a statistically significant increase (p (>) .1) in persistence, GPA, or credits earned over the matched group. Yet, a small effect was measured for GPA (d = 0.51, fall and d = 0.12, spring), credits earned (d = 0.17, fall and d = 0.13, spring), and persistence (OR = 1.28, fall and OR = 1.25, spring). The positive finding encourages more research into the theory of multiple interventions for community college students.In conclusion, future research should include following up with the participants in year two to determine how long the intervention effect persists. Also, increasing the sample size by including other first-year programs run by the institution improves the ability to detect differences and improve confidence. Finally, multiple interventions need to be tried on many different types of students to determine who benefits most.
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Date Issued: 2017
Identifier: CFE0006879, ucf:51717
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006879

Title: IMPROVING PROJECT MANAGEMENT WITH SIMULATION AND COMPLETION DISTRIBUTION FUNCTIONS.
Creator: Cates, Grant, Mollaghasemi, Mansooreh, University of Central Florida
Abstract / Description: Despite the critical importance of project completion timeliness, management practices in place today remain inadequate for addressing the persistent problem of project completion tardiness. Uncertainty has been identified as a contributing factor in late projects. This uncertainty resides in activity duration estimates, unplanned upsetting events, and the potential unavailability of critical resources. This research developed a comprehensive simulation based methodology for conducting...
Show moreDespite the critical importance of project completion timeliness, management practices in place today remain inadequate for addressing the persistent problem of project completion tardiness. Uncertainty has been identified as a contributing factor in late projects. This uncertainty resides in activity duration estimates, unplanned upsetting events, and the potential unavailability of critical resources. This research developed a comprehensive simulation based methodology for conducting quantitative project completion-time risk assessments. The methodology enables project stakeholders to visualize uncertainty or risk, i.e. the likelihood of their project completing late and the magnitude of the lateness, by providing them with a completion time distribution function of their projects. Discrete event simulation is used to determine a project's completion distribution function. The project simulation is populated with both deterministic and stochastic elements. Deterministic inputs include planned activities and resource requirements. Stochastic inputs include activity duration growth distributions, probabilities for unplanned upsetting events, and other dynamic constraints upon project activities. Stochastic inputs are based upon past data from similar projects. The time for an entity to complete the simulation network, subject to both the deterministic and stochastic factors, represents the time to complete the project. Multiple replications of the simulation are run to create the completion distribution function. The methodology was demonstrated to be effective for the on-going project to assemble the International Space Station. Approximately $500 million per month is being spent on this project, which is scheduled to complete by 2010. Project stakeholders participated in determining and managing completion distribution functions. The first result was improved project completion risk awareness. Secondly, mitigation options were analyzed to improve project completion performance and reduce total project cost.
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Date Issued: 2004
Identifier: CFE0000209, ucf:46243
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000209

Title: Direct measurement of thicknesses, volumes or compositions of nanomaterials by quantitative atomic number contrast in high-angle annular dark-field scanning transmission electron microscopy.
Creator: Yuan, Biao, Heinrich, Helge, Sohn, Yongho, Coffey, Kevin, Fang, Jiyu, Roldan Cuenya, Beatriz, University of Central Florida
Abstract / Description: The sizes, shapes, volumes and compositions of nanoparticles are very important parameters determining many of their properties. Efforts to measure these parameters for individual nanoparticles and to obtain reliable statistics for a large number of nanoparticles require a fast and reliable method for 3-D characterization. In this dissertation, a direct measurement method for thicknesses, volumes or compositions of nanomaterials by quantitative atomic number contrast in High-Angle Annular...
Show moreThe sizes, shapes, volumes and compositions of nanoparticles are very important parameters determining many of their properties. Efforts to measure these parameters for individual nanoparticles and to obtain reliable statistics for a large number of nanoparticles require a fast and reliable method for 3-D characterization. In this dissertation, a direct measurement method for thicknesses, volumes or compositions of nanomaterials by quantitative atomic number contrast in High-Angle Annular Dark-Field (HAADF) Scanning Transmission Electron Microscopy (STEM) is presented. A HAADF detector collects electrons scattered incoherently to high angles. The HAADF signal intensity is in first-order approximation proportional to the sample thickness and increases with atomic number. However, for larger sample thicknesses this approach fails. A simple description for the thickness dependence of the HAADF-STEM contrast has been developed in this dissertation. A new method for the calibration of the sensitivity of the HAADF detector for a FEI F30 transmission electron microscope (TEM) is developed in this dissertation. A nearly linear relationship of the HAADF signal with the electron current is confirmed. Cross sections of multilayered samples provided by TriQuint Semiconductors in Apopka, FL, for contrast calibration were obtained by focused ion-beam (FIB) preparation yielding data on the interaction cross section per atom.To obtain an absolute intensity calibration of the HAADF-STEM intensity, Convergent Beam Electron Diffraction (CBED) was performed on Si single crystals. However, for samples prepared by the focused ion beam technique, CBED often significantly underestimates the sample thickness. Multislice simulations from Dr. Kirkland's C codes are used for comparison with experimental results. TEM offers high lateral resolution, but contains little or no information on the thickness of samples. Thickness maps in energy-filtered TEM (EFTEM), CBED and tilt series are so far the only methods to determine thicknesses of particles in TEM. In this work I have introduced the use of wedge-shaped multilayer samples prepared by FIB for the calibration of HAADF-STEM contrasts. This method yields quantitative contrast data as a function of sample thickness. A database with several pure elements and compounds has been compiled, containing experimental data on the fraction of electrons scattered onto the HAADF detector for each nanometer of sample thickness. The use of thick samples reveals an increased signal at the interfaces of high- and low-density materials. This effect can be explained by the transfer of scattered electrons from the high density material across the interface into the less-absorbing low-density material. The calibrations were used to determine concentration gradients in nanoscale Fe-Pt multilayers as well as thicknesses and volumes of individual Au-Fe, Pt, and Ag nanoparticles. Volumes of nanoparticles with known composition can be determined with accuracy better than 15%. Porosity determination of materials becomes available with this method as shown in an example of porous Silicon.?
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Date Issued: 2012
Identifier: CFE0004464, ucf:49355
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004464

Title: A Time-Course Analysis of Behavioral Plasticity and Differential Gene Expression Patterns in Response to Density in Schistocerca americana (Orthoptera: Acrididae).
Creator: Gotham, Steven, Song, Hojun, Vonkalm, Laurence, Fedorka, Kenneth, University of Central Florida
Abstract / Description: Phenotypic plasticity is the ability of the genotype to express alternative phenotypes in response to different environmental conditions and this is considered to be an adaptation in which a species can survive and persist in a rapidly changing environment. Some grasshoppers and locusts are capable of expressing an extreme form of density-dependent phenotypic plasticity, known as locust phase polyphenism. At low population density, the individuals typically have a cryptic coloration as nymphs...
Show morePhenotypic plasticity is the ability of the genotype to express alternative phenotypes in response to different environmental conditions and this is considered to be an adaptation in which a species can survive and persist in a rapidly changing environment. Some grasshoppers and locusts are capable of expressing an extreme form of density-dependent phenotypic plasticity, known as locust phase polyphenism. At low population density, the individuals typically have a cryptic coloration as nymphs, are less active, and only seek out conspecifics for reproductive purposes. At high density, however, they develop a drastically different phenotype in which they have a conspicuous coloration, are much more active, and tend to stay together in large groups. The American Birdwing grasshopper, Schistocerca americana, is a non-swarming species related to the desert locust, S. gregaria, which shows density-dependent phenotypic plasticity in behavior, color, and morphology. In this thesis, I have identified the duration of crowding necessary for a 6th instar S. americana reared in the isolated condition to express the typical crowded behavior. The behavior changed after just one hour of crowding and the effect of crowding diminished after 48 hours to near-complete isolated behavior. In reverse, the crowded condition was isolated, but behavior did not significantly change over time. Gene expression of the following three genes suspected of having a role in behavior change were investigated based on studies of S. gregaria: protein kinase A (PKA), L-Tryptophan-5-monooxygenase (T-5), and Aromatic L-amino acid decarboxylase (Decarb). T-5 was up-regulated in the long-term isolated condition compared to the long-term crowded condition. T-5 and Decarb were up-regulated in isolated individuals that were crowded for 10 hours compared to the long-term isolated condition. This study represents a novel contribution in the study of phenotypic plasticity as it establishes the time course of behavioral and molecular plasticity in a non-swarming grasshopper for the first time.
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Date Issued: 2014
Identifier: CFE0005799, ucf:50049
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005799

Title: PHYSICAL CHARACTERISTICS OF AN INDIVIDUAL: THE IDENTIFICATION OF BIOMARKERS FOR BIOLOGICAL AGE DETERMINATION.
Creator: Alvarez, Michelle, Ballantyne, Jack, University of Central Florida
Abstract / Description: It is now a matter of routine for the forensic scientist to obtain the genetic profile of an individual from DNA recovered from a biological stain deposited at a crime scene. Potential contributors of the stain must either be known to investigators (i.e. a developed suspect) or the questioned profile must be searched against a database of DNA profiles such as those maintained in the CODIS National DNA database. However, in those instances where there is no developed suspect and no match is...
Show moreIt is now a matter of routine for the forensic scientist to obtain the genetic profile of an individual from DNA recovered from a biological stain deposited at a crime scene. Potential contributors of the stain must either be known to investigators (i.e. a developed suspect) or the questioned profile must be searched against a database of DNA profiles such as those maintained in the CODIS National DNA database. However, in those instances where there is no developed suspect and no match is obtained after interrogation of appropriate DNA databases, the DNA profile per se presently provides no meaningful information to investigators, with the notable exception of gender determination. In these situations it would be advantageous to the investigation, if additional probative information could be obtained from the biological stain. A useful biometric that could provide important probative information, and one that may be amenable to molecular genetic analysis, is the biological age of an individual. The ability to provide investigators with information as to whether a DNA donor is a newborn, infant, toddler, child, adolescent, adult, middle-aged or elderly individual could be useful in certain cases, particularly those involving young children such as kidnappings or in providing additional intelligence during terrorist investigations. Currently no validated molecular assays exist for age determination. Biological human ageing can be defined by two distinct processes, degenerative and developmental ageing. The degenerative process of ageing is based on theories which identify an increase or decrease in physiological conditions with increasing age. In contrast, the developmental process of ageing is based on the theory that as individuals increase in chronological age, there will be subtle corresponding molecular based biological changes, each requiring genes to be expressed or silenced, indicative of that particular stage of life. We investigated the degenerative process of chromosomal telomere shortening, as well as the developmental process of gene expression profiling analysis, in an attempt to identify biomarkers of biological age in a self-renewing tissue such as blood. While telomere length analysis was an ineffective method for age determination; gene expression analysis revealed three gene transcripts expressed in an age-dependent physiological manner. These species namely- COL1A2, HBE1 and IGFBP3, were found to be expressed at elevated levels in younger individuals, newborns, or post-pubertal individuals, respectively. The biological process of hemoglobin switching was also investigated for the possibility of determining human age. While experimenting with the potential of using the gamma-hemoglobin chains, as newborn specific gene candidates, we serendipitously discovered four novel truncated transcripts, which we have termed HBG1n1, HBG1n2, HBG2n2 and HBG2n3; whose expression was restricted to whole-blood newborn samples and specific fetal tissues. The molecular origin of these transcripts appears to be at the RNA level, being produced by specific rearrangement events occurring in the standard gamma hemoglobin transcripts (HBG1 and HBG2), which yield these new isoforms that are expressed in a highly regulated tissue specific manner.
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Date Issued: 2007
Identifier: CFE0001737, ucf:47297
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001737

Title: Predicting Gun Ownership in America: Birth Cohort, Political Views, and Attitudes Towards Gun Control Legislation.
Creator: Adams, Jared, Gay, David, Donley, Amy, Corzine, Harold, University of Central Florida
Abstract / Description: With mass shootings occurring with frightening regularity, research into gun ownership behavior is becoming increasingly important for public policy creation and public safety. While extant research tells us that firearm ownership is woven deep into the historical fabric of American culture, scholarship has yet to fully explore predictors for gun ownership. Employing 2015 Pew Research Center political survey data, this study examines the predictive effects of birth cohort, political ideology,...
Show moreWith mass shootings occurring with frightening regularity, research into gun ownership behavior is becoming increasingly important for public policy creation and public safety. While extant research tells us that firearm ownership is woven deep into the historical fabric of American culture, scholarship has yet to fully explore predictors for gun ownership. Employing 2015 Pew Research Center political survey data, this study examines the predictive effects of birth cohort, political ideology, and attitudes towards gun control legislation on gun ownership, with and without controls, using hierarchical binary logistic regression models. The presented models examine three separate cohorts: The Millennials, Generation X, and the Baby Boomers. Findings reveal that Millennials, liberal political ideology, attitudes which stress the importance of controlling, as opposed to protecting, gun ownership are significantly less likely to own a firearm. Furthermore, gender, household income, population density, southern residency, and race were also found to significantly influence gun ownership. Implications, limitations, and recommendations for future research are also discussed. While this research cannot perfectly predict individual gun ownership, it does effectively highlight several important facts to consider. From the fog of media speculation, political grandstanding, and overly simplistic and unwarranted assumptions, the results of this study bring into full view the inherent complexity of American gun ownership.
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Date Issued: 2017
Identifier: CFE0006706, ucf:51913
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006706

Title: A RELATIONSHIP STUDY OF STUDENT SATISFACTION WITH LEARNING ONLINE AND COGNITIVE LOAD.
Creator: Bradford, George, Dziuban, Charles, University of Central Florida
Abstract / Description: This study sought to explore if a relationship exists between cognitive load and student satisfaction with learning online. The study separates academic performance (a.k.a., ÃÂ"learningÃÂ") from cognitive load and satisfaction to better distinguish influences on cognition (from cognitive load) and motivation (from satisfaction). Considerations that remain critical to the field of instructional design, as they apply to learning online, were described and used to guide a review of the...
Show moreThis study sought to explore if a relationship exists between cognitive load and student satisfaction with learning online. The study separates academic performance (a.k.a., Ã‚Â"learningÃ‚Â") from cognitive load and satisfaction to better distinguish influences on cognition (from cognitive load) and motivation (from satisfaction). Considerations that remain critical to the field of instructional design, as they apply to learning online, were described and used to guide a review of the literature to find directions to fulfill the goal of this study. A survey was conducted and 1,401 students responded to an instrument that contained 24 items. Multiple analysis techniques found a positive, moderate, and significant (p < .01) correlation between cognitive load and satisfaction. Most importantly, the results found that approximately 25% of the variance in student satisfaction with learning online can be explained by cognitive load. New constructs emerged from a Principal Components Analysis that suggest a refined view of student perspectives and potential improvement to guide instructional design. Further, a correlation, even a moderate one, has not previously been found between cognitive load and satisfaction. The significance of this finding presents new opportunities to study and improve online instruction. Multiple opportunities for future research are briefly discussed and guidelines for developing online course designs using interpretations of the emerged factors are made.
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Date Issued: 2010
Identifier: CFE0003164, ucf:48599
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003164

Title: A curricula assessment and improvement quantitative model for higher education: a design for six sigma methodology.
Creator: Halawany, Abdullah, Elshennawy, Ahmad, Lee, Gene, Rabelo, Luis, Rahal, Ahmad, University of Central Florida
Abstract / Description: Curricula assessment is an integrated process to assist higher education institutions in addressing the challenges in adesignated field of study and in exploring the opportunities to better educate and prepare their students for an increasinglycomplex world.Although assessment as a topic has been researched extensively, there has been a lack of quantitative tools that addressthe requirements of many of the stakeholders that may be critical to the curriculum design and assessment processes...
Show moreCurricula assessment is an integrated process to assist higher education institutions in addressing the challenges in adesignated field of study and in exploring the opportunities to better educate and prepare their students for an increasinglycomplex world.Although assessment as a topic has been researched extensively, there has been a lack of quantitative tools that addressthe requirements of many of the stakeholders that may be critical to the curriculum design and assessment processes.This research proposes the utilization of Design for Six Sigma (DFSS) to develop a quantitative model for curriculumassessment and improvement for higher education institutions. A review of the literature indicates that there is a lack ofquantitative tools that enhance the reliability and efficiency of gathering customer requirements for curriculum in highereducation environment. In addition, there is a lack of tools to translate these requirements into actual characteristics that canbe used for curriculum design and assessment purposes. The literature also indicates that curriculum assessment is one ofseveral educational processes that affect the quality of education.This research proposes a quantitative model for curriculum assessment and improvement in higher education institutions,utilizing design for six sigma methodology. The proposed model explores the use of the Kano model concept to translateneeded requirements into desirable curriculum attributes and the general concept of establishing transfer function todetermine the level at which those requirements have been satisfied. The use of the developed model can help improvestudent learning and provide curriculum stakeholders with timely feedback about the curriculum and identify areas in need ofimprovement.To validate the capability of the proposed model, an ABET accredited department of Industrial Engineering in a USuniversity was used a case study.
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Date Issued: 2014
Identifier: CFE0005344, ucf:50497
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005344

Title: The Effectiveness of Using Florida Virtual High School Course Data during the College Admission Process as a Predictor of Degree Completion Within Six Years.
Creator: Callahan, Michael, King, Kathy (Kathleen), Cox, Dr. Thomas, Whiteman, JoAnn, Preston, Michael, University of Central Florida
Abstract / Description: The admission process at higher education institutions has not adapted for online distance education classes taken in high schools, such as those offered by the Florida Virtual School. The purpose of this study was to determine whether online distance education courses taken in high school can serve as an indicator of student success in post-secondary education. An honors program at a large public research university provided the data examined. This honors program stored online distance...
Show moreThe admission process at higher education institutions has not adapted for online distance education classes taken in high schools, such as those offered by the Florida Virtual School. The purpose of this study was to determine whether online distance education courses taken in high school can serve as an indicator of student success in post-secondary education. An honors program at a large public research university provided the data examined. This honors program stored online distance education information in a database, which allowed for analysis. Presently, the institution's primary undergraduate admission office does not collect or store this type of information. I used SPSS Statistics to calculate logistical regression on this data. My goal was to discover what effect the high school online distance education variables had on the outcome of graduating in four or six years. Graduation rate is a key metric for colleges and universities as an indicator of success. For this reason, I wanted to determine through this study whether high school online distance education assisted in predicting which students will graduate. At least two stakeholders will find this information useful. Admission officers and, more specifically, honors admission officers will gain more insight into the student selection process as this study examines students in the top 10% of the incoming class. The other group, future researchers, will learn from this study and other new studies for even more understanding on this topic. Although the results indicated that high-achieving Florida Virtual School students do not graduate at higher rate than students who have not completed distance education classes, more research is required to understand how the other 90% of student applicants are affected by distance education courses completed in high school.
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Date Issued: 2017
Identifier: CFE0006861, ucf:51754
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006861

Title: COUNTER-TERRORISM: WHEN DO STATES ADOPT NEW ANTI-TERROR LEGISLATION?.
Creator: Clesca, Princelee, Dolan, Thomas, University of Central Florida
Abstract / Description: The intent of this thesis is to research the anti-terror legislation of 15 countries and the history of terrorist incidents within those countries. Both the anti-terror legislation and the history of terrorist incidents will be researched within the time period of 1980 to 2009, a 30 year span. This thesis will seek to establish a relationship between the occurrence of terrorist events and when states change their anti-terror legislation. Legislation enacted can vary greatly. Common changes in...
Show moreThe intent of this thesis is to research the anti-terror legislation of 15 countries and the history of terrorist incidents within those countries. Both the anti-terror legislation and the history of terrorist incidents will be researched within the time period of 1980 to 2009, a 30 year span. This thesis will seek to establish a relationship between the occurrence of terrorist events and when states change their anti-terror legislation. Legislation enacted can vary greatly. Common changes in legislation seek to undercut the financing of terrorist organizations, criminalize behaviors, or empower state surveillance capabilities. A quantitative analysis will be performed to establish a relationship between terrorist attacks and legislative changes. A qualitative discussion will follow to analyze specific anti-terror legislation passed by states in response to terrorist events.
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Date Issued: 2015
Identifier: CFH0004851, ucf:45451
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004851

Title: The Effect of Feedback Medium on Accuracy with English Articles.
Creator: Giltner, Elizabeth, Nutta, Joyce, Purmensky, Kerry, Clark, M. H., Kaplan, Jeffrey, University of Central Florida
Abstract / Description: Developing and demonstrating English proficiency is a critical skill for non-native English speakers (NNESs) who wish to study in American universities. Unlike their native English speaker (NES) counterparts, NNES students who apply for university admission are required to demonstrate their proficiency in English via tests, such as the Test of English as a Foreign Language (TOEFL), that measure an NNES's ability to understand, speak, read, and write English. Although the number of students...
Show moreDeveloping and demonstrating English proficiency is a critical skill for non-native English speakers (NNESs) who wish to study in American universities. Unlike their native English speaker (NES) counterparts, NNES students who apply for university admission are required to demonstrate their proficiency in English via tests, such as the Test of English as a Foreign Language (TOEFL), that measure an NNES's ability to understand, speak, read, and write English. Although the number of students who have attained those minimum scores is large, there is a large population of adult NNESs enrolled in intensive English programs (IEPs) that are designed to help them improve their proficiency in English and again admission into mainstream university courses. Given that many university instructors require the submission of written work that demonstrates students' understanding of course content, perhaps the most important academic skill developed in IEPs is writing. Furthermore, the lack of attention given to addressing grammatical errors at the tertiary level highlights IEP instructors' need for effective and efficient methods of addressing grammatical errors in NNES writing.The present quantitative study used two experimental designs, a pretest-posttest design and a posttest-only design with proxy pretest (Campbell (&) Stanley, 1963), to investigate the efficacy of two types of indirect corrective feedback (CF) for improving adult, IEP-enrolled, intermediate level NNES writers' (participants) grammatical accuracy in academic papers. Grammatical accuracy for this study was measured by counting the number of errors participants committed when using English definite and indefinite articles in academic papers. The independent variable for this study was the type of CF participants were randomly selected to receive (-) either screencast corrective feedback (SCF) or written corrective feedback (WCF). The dependent variable, which measured the effect of the CF given, was the number of errors participants made with English definite and indefinite articles on three compositions completed to satisfy the requirements of their IEP writing class. The results of the current research demonstrated that participants made similar gains in grammatical accuracy when using CF to revise descriptive compositions. These results are in keeping with the results of previous studies that showed the usefulness of CF for improving grammatical accuracy on revised compositions (Bitchener, 2008, Bitchener (&) Knoch, 2008, 2009a, 2009b, 2010a). However, the improvement observed on the revised descriptive compositions did not transfer to new classification essays, regardless of the type of CF participants received. Participants' lack of grammatical accuracy on new compositions of a different genre effectively illustrated the difficulty English articles pose for NNESs when writing and the need for multiple exposures to CF and writing practice to develop NNESs' ability to consistently use English articles accurately.The main implication of the present study lies in the recommendation of the provision of CF to NNES students and systematic instruction about how to use CF received in order to allow NNESs to become more self-sufficient learners and writers of English.
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Date Issued: 2016
Identifier: CFE0006106, ucf:51187
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006106

Title: The Social Function of For-Profit Higher Education in the United States.
Creator: Baird, Andrew, Carter, J. Scott, Carter, Shannon, Gay, David, Roos, J., University of Central Florida
Abstract / Description: This study uses the competing Burton Clark's (")Cooling Out Theory(") and Daniel Bell's (")Theory of the Postindustrial Economy(") to examine the function that for-profit colleges and universities (FPCUs) play in American higher education and how it is different from non-profit traditional colleges and universities (TCUs). This was done through three sections of analysis. The first examined if students who enroll at these FPCUs are less academically prepared than those attending non-profit...
Show moreThis study uses the competing Burton Clark's (")Cooling Out Theory(") and Daniel Bell's (")Theory of the Postindustrial Economy(") to examine the function that for-profit colleges and universities (FPCUs) play in American higher education and how it is different from non-profit traditional colleges and universities (TCUs). This was done through three sections of analysis. The first examined if students who enroll at these FPCUs are less academically prepared than those attending non-profit traditional colleges or universities. The second tested if academic preparedness is associated with postsecondary performance at FPCUs to the same degree it is at TCUs. The final section of analysis looked at FPCU graduates to see if they have different short-term job outcomes when compared to traditional college graduates. This research utilizes The Beginning Postsecondary Survey 2009- a restricted-use longitudinal data set produced by the National Center for Education Statistics that followed 16,700 first-time college enrollees from 2003 until 2009. This data set includes information on student demographics, academic performance, enrollment history, and job outcomes. The results of this study indicated that when compared to traditional college students, FPCU students are less likely to be academically prepared for college and are more frequently characterized by risk factors that previous research has shown makes it less likely they will complete their degree. This research also found that unlike TCUs, high school academic performance is not associated with post-secondary performance or likelihood of degree attainment at FPCUs. Finally, it was observed that FPCU graduates were less likely to have jobs related to their degree and earned less income than TCU graduates, but had about the same degree of job satisfaction.
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Date Issued: 2015
Identifier: CFE0005761, ucf:50096
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005761

Quantitative (4)	+ -
quantitative methods (3)	+ -
Characterization (2)	+ -
Quantitative Research (2)	+ -
Quantitative Study (2)	+ -

TEM (2)	+ -
Thickness (2)	+ -
higher education (2)	+ -
quantitative analysis (2)	+ -
15 countries (1)	+ -
30 years (1)	+ -
Admission (1)	+ -
Admissions (1)	+ -
Adult English Learners (1)	+ -
Age Determination (1)	+ -
Atomic number contrast (1)	+ -
Attitudes (1)	+ -
Beginning Postsecondary Survey (1)	+ -
Behavior Time-Course (1)	+ -
Binary Logistic Regression (1)	+ -
Biological Age (1)	+ -
Birth Cohort (1)	+ -
College Admissions (1)	+ -
Corrective Feedback (1)	+ -
Counter-terrorism (1)	+ -
DFSS (1)	+ -
Dissertation (1)	+ -
Distance Education (1)	+ -
English Articles (1)	+ -
Error Correction (1)	+ -

ETD Collection (18)	+ -
Honors Collection (1)	+ -

University of Central Florida (19)	+ -
Corzine, Harold (3)	+ -
Gay, David (3)	+ -
Hahs-Vaughn, Debbie (2)	+ -
Heinrich, Helge (2)	+ -

Sivo, Stephen (2)	+ -
Adams, Jared (1)	+ -
Alvarez, Michelle (1)	+ -
Bai, Haiyan (1)	+ -
Bain, Andrew (1)	+ -
Baird, Andrew (1)	+ -
Ballantyne, Jack (1)	+ -
Bares, Lindsey (1)	+ -
Barringer, Mandi (1)	+ -
Besaw, Clayton (1)	+ -
Bradford, George (1)	+ -
Butler, Chandre (1)	+ -
Butler, Malcolm (1)	+ -
Callahan, Michael (1)	+ -
Carter, J. Scott (1)	+ -
Carter, Shannon (1)	+ -
Cates, Grant (1)	+ -
Christensen, Ashley (1)	+ -
Clark, M. H. (1)	+ -
Clesca, Princelee (1)	+ -
Coffey, Kevin (1)	+ -
Cox, Dr. Thomas (1)	+ -
Dolan, Thomas (1)	+ -
Donley, Amy (1)	+ -
Dziuban, Charles (1)	+ -

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