UNT Theses and Dissertations - 248 Matching Results

Search Results

Forest Landscape Dynamics: a Semi-Markov Modeling Approach

Description: A transition model (MOSAIC) is used to describe forest dynamics at the landscape scale. The model uses a semi-Markov framework by considering transition probabilities and Erlang distributed holding times in each transition. Parameters for the transition model are derived from a gap model (ZELIG). This procedure ensures conceptual consistency of the landscape model with the fine scale ecological detail represented by the forest gap model. Spatial heterogeneity in the transition model is driven by maps of terrain with characteristics contained in a Geographic Information System (GIS) database. The results of the transition model simulations, percent cover forest type maps, are exported to grid-maps in the GIS. These cover type maps can be classified and used to describe forest dynamics using landscape statistics metrics. The linkage model-GIS enhances the transition model spatial analytical capabilities. A parameterization algorithm was developed that takes as input gap model tracer files which contain the percent occupation of each cover type through time. As output, the algorithm produces a file that contains the parameter values needed for MOSAIC for each one of the possible transitions. Parameters for the holding time distribution were found by calculating an empirical estimate of the cumulative probability function and using a non-linear least squares method to fit this estimate to an Erlang distribution. The algorithm provided good initial estimates of the transitions parameters that can be refined with few additional simulations. A method for deriving classification criteria to designate cover types is presented. The method uses cluster analysis to detect the number and type of forest classes and Classification and Regression Tree (CART) analysis to explain the forest classes in term of stand attributes. This method provided a precise and objective approach for forest cover type definition and classification. The H. J. Andrews forest in Oregon was used to demonstrate the ...
Date: August 1997
Creator: Ablan, Magdiel
Partner: UNT Libraries

Southern Genre Painting and Illustration from 1830 to 1890

Description: The purpose of this thesis is to give a concise view of stylistic, iconographical, and iconological trends in Southern genre paintings and illustrations between 1830 and 1890 by native Southern artists and artists who lived at least ten years in the South. Exploration of artworks was accomplished by compiling as many artworks as possible per decade, separating each decade by dominant trends in subject matter, and researching to determine political and/or social implications associated with and affecting each image. Historical documents and the findings of other scholars revealed that many artworks carried political overtones reflecting the dominant thought of the white ruling class during the period while the significance and interpretation of other artworks was achieved by studying dominant personal beliefs and social practices.
Date: December 1997
Creator: Akard, Carrie Meitzner
Partner: UNT Libraries

A Structural Equation Analysis of Intergenerational Differences in Attitudes toward Individual Modernity in the United Arab Emirates: Implications for Cross-Cultural Research

Description: It has been widely believed that modernity is a byproduct of a nuclear family system, a highly urbanized society, and a secular way of life. As such, developing countries are characterized as modern insofar as their social and cultural structures are able to correspond to these criteria. To examine the validity of these propositions, data on two randomly-selected generations--daughters and mothers in the United Arab Emirates--were generated.
Date: May 1997
Creator: Al-Ghazy, Faris M.
Partner: UNT Libraries

Mail Order Music: the Hinners Organ Company in the Dakotas, 1879-1936

Description: Founded in 1879 by John L. Hinners, the Hinners Organ Company developed a number of stock models of small mechanical-action instruments that were advertised throughout the Midwest. Operating without outside salesmen, the company was one of the first to conduct all of its affairs by mail, including the financial arrangements, selection of the basic design, and custom alterations where required. Buyers first met a company representative when he arrived by train to set up the crated instrument that had been shipped ahead of him. Tracker organs with hand-operated bellows were easily repaired by local craftsmen, and were suited to an area that, for the most part, lacked electricity. In all, the company constructed nearly three thousand pipe organs during its sixty years of operation. Rapid decline of the firm began in the decade prior to 1936 during which the company sold fewer than one hundred instruments, and closed in that year when John's son Arthur found himself without sufficient financial resources to weather the lengthy depression. The studies of the original-condition Hinners organs in the Dakotas include extensive photographs and measurements, and provide an excellent cross section of the smaller instruments produced by the company. They are loud, excellently crafted, functionally attractive, tonally typical of the early twentieth-century American Romantic organ, and utilize designs and materials typical of this era. Only recently has it been acknowledged that these Hinners organs represent a "meat and potatoes" class of instrument, as it were, an honest meal without the pretense of delicate appetizers, vintage wine, and gourmet dessert. In this way the company offered churches a serviceable and respectable musical alternative to grandeur, and was able to fulfill the needs and meet the budget of a small congregation without the expense of a custom instrument.
Date: August 1997
Creator: Alcorn-Oppedahl, Allison A. (Allison Ann)
Partner: UNT Libraries

Systematics of the stonefly tribe Suwalliini Surdick and behavioral studies of selected species in the stonefly families Chloroperlidae and Perlidae

Description: The purpose of this study is to revise the genus Suwallia and to evaluate the potential taxonomic importance of adeagal and other genitalic characters, adult pigment patterns and egg characters. The revision concentrates on western North American species while providing coverage of all species, except Suwallia asiatica Zhiltzova and Lavanidova where only presumed females have been available for study.
Date: August 1997
Creator: Alexander, Kevin D. (Kevin Dewayne)
Partner: UNT Libraries

Critical factors in successful Texas middle schools 1993-1995

Description: An examination of the characteristics of Texas middle schools was conducted with the objective of developing a planning tool for middle staffs. This success is measured by the Academic excellence Indicator System (AEIS), whose rating scale has three components: campus scores on the Texas Assessment of Basic Skills (TAAS), campus attendance percentages, and campus dropout rates. TAAS scores and attendance rates have been the focus of this study.
Date: August 1997
Creator: Antoine, Terry W.
Partner: UNT Libraries

Factors Influencing Freshmen Students' College Choice at the University of North Texas: a Focus Group Study

Description: This study focused on factors that may influence freshmen students when choosing their colleges, specifically those who attend metropolitan universities such as the University of North Texas. In addition to identifying major characteristics of the institution that attract students, it also explored the sources of information that students considered important when making their choice about where to attend college. The primary instrument for gathering the data was focus groups. These informal, small groups provided a format for in-depth discussion and probing questioning about the needs, wants and influential factors driving freshmen college choice. Ten focus groups were held with between six and ten students in a specially designed room on the campus of the University of North Texas. A professional moderator was employed and sessions were observed via a two-way mirror and tape recorded for later transcription. The major questions addressed in the focus groups included: What factors influenced students the most to attend the University of North Texas? What did they consider the level of friendliness on campus? And how did the marketing materials that the university distributed impact their decision to attend? The study found that the factors that most influenced freshmen to attend the University of North Texas were low cost, convenient location and the good academic reputation of their field of study. Students believed North Texas to have a very friendly campus and were pleased with the overall academic environment. They were not, however, impressed or greatly influenced by the marketing materials currently being used by the University and suggested ways to improve the design and distribution of these materials to make them more effective. Additional observations were made concerning these and related questions. A partial transcription of the focus group sessions is included.
Date: August 1997
Creator: Armstrong, Jami J. (Jami Joi)
Partner: UNT Libraries

Compulsive Sexual Behavior and Personality Characteristics : A Comparative Analysis

Description: The purpose of the present study was to compare the scores of the Beck Depression Inventory, State-Trait Anxiety Inventory, and the Coopersmith Inventory of heterosexual men with compulsive sexual behavior (N = 22), homosexual men with compulsive sexual behavior (N = 19), heterosexual men without compulsive sexual behavior (N = 38), and homosexual men without compulsive sexual behavior (N = 8). The Sex Addiction Screening Test was used to determined placement in a group. Findings revealed men who exhibit compulsive sexual behavior are significantly more depressed, experience lower self-esteem and have higher state anxiety (situational) than controls.
Date: December 1997
Creator: Austin, Christopher Joe
Partner: UNT Libraries

Computer-Supported Collaborative Work and Its Application to Software Engineering in a Case Environment

Description: This study investigated, in the context of a field-based case study, possibilities for formation of a synergistic union between CSCW and CASE tools. A major dimension of today's software challenge is in gearing up for large-scale system development necessitating large teams of systems engineers. The principal goal of this research was to advance the body of knowledge regarding the nature of collaborative technological support in the software development process. Specifically, the study was designed to evaluate the potential for using a CSCW tool as an effective front-end to a CASE tool in the furtherance of SDLC goals.
Date: May 1997
Creator: Bailey, Janet L.
Partner: UNT Libraries

Performance of Children With and Without Traumatic Brain Injury on the Process Scoring System for the Intermediate Category Test

Description: The clinical utility of the Intermediate Category Test, a measure of executive functioning in children 9 to 14 years of age, is currently limited by the availability of only a Total Error score for normative interpretation. The Process Scoring System (PSS) was developed to provide a standardized method of assessing specific processing patterns and problem-solving errors. The purpose of this study was to determine the ability of the PSS scores to discriminate between children with and without suspected executive deficits, thereby providing evidence of criterion-related validity.
Date: May 1997
Creator: Bass, Catherine
Partner: UNT Libraries

Self-Efficacy and Selected Variables as Predictors of Persistence for First Quarter Students at a Proprietary Institution

Description: Proprietary colleges are uniquely different from two or four year colleges due to the emphasis on the student establishing a definite career path prior to enrollment. Because of this career track emphasis, Bandura's (1977) postulation that self-efficacy is a significant variable influencing task completion may offer insight into the challenge of student retention at a proprietary college. The study's purpose was to determine if career self-efficacy, demographic factors, and academic preparedness measures in first quarter students could predict student persistence, class attendance, and academic performance. The statistical technique of multinomial logistic regression was applied to data files of 725 first quarter students who attended The Art Institute of Dallas from Summer 1996 through Winter 1997. The predictor variables included a measure of career self-efficacy, ASSET scores (American College Testing Program, 1994), ethnicity, age, gender, full-time/part-time attendance, high school grade point average, parents' educational level, socioeconomic status, and developmental course placement. Criterion variables were completion, class attendance, and cumulative grade point average.
Date: August 1997
Creator: Baughman, Leslie C. (Leslie Claire)
Partner: UNT Libraries

Political Culture in West and East Germany at the TIme of Reunification: Revisiting the Civic Culture

Description: Studies of political culture have often focused on the impact of political institutions on political culture in a society. The scientific community has accepted the position that institutions shape beliefs and attitudes among the citizens towards the system they live in. This study tests this hypothesis by using survey data collected during the fall of 1990 in the United States, Great Britain, Italy, West, and East Germany.
Date: August 1997
Creator: Baumann, Steffen
Partner: UNT Libraries

East, West, Somewhere in the Middle

Description: A work of creative fiction in novella form, this dissertation follows the first-person travails of Mitch Zeller, a 26-year-old gay man who is faced with an unexpected choice. The dissertation opens with a preface which examines the form of the novella and the content of this particular work.
Date: December 1997
Creator: Behlen, Shawn Lee
Partner: UNT Libraries

A Comparison of Academic Stress Experienced by Students at an Urban Community College and an Urban University

Description: The present study compared the academic stress levels of 450 college sophomore students at a public university and a public two-year college. This investigation also explored the levels of academic stress by institutional type, age, gender, and ethnicity. Data were obtained from having the subjects complete the Academic Stress Scale, a questionnaire which lists thirty five stress items found in the college classroom. Analysis of variance and t-tests were used to analyze the data. There were 225 subjects each in the community college group and the university group. The university group had a statistically significant higher mean stress score than the community college group. 294 traditional age (23 and younger) and 156 nontraditional age (24 and over) subjects stress levels were compared. It was found that the traditional age college student group experienced a statistically significant higher academic stress level in both academic settings. Group means were compared between the stress scores of 245 female and 205 male subjects. At both the community college and university levels, the female group had a statistically significant higher level of academic stress. The academic stress levels were also compared according to ethnicity. The minority group consisted of 104 subjects and 346 subjects comprised the non-minority group. At the community college, the minority group had a statistically significant higher level of academic stress. However, at the university level, there was no statistically significant difference by ethnicity. Examinations, final grades, term papers, homework, and studying for examinations were ranked as being stressful by the largest percentage of all the subjects. It was found in this study that levels of academic stress differ significantly by institutional type, age, gender, and ethnicity. Implications for college students, instructors, and administrators , based on this study's conclusions, are offered.
Date: May 1997
Creator: Benson, Larry G. (Larry Glen)
Partner: UNT Libraries

The Fractal Stochastic Point Process Model of Molecular Evolution and the Multiplicative Evolution Statistical Hypothesis

Description: A fractal stochastic point process (FSPP) is used to model molecular evolution in agreement with the relationship between the variance and mean numbers of synonymous and nonsynonymous substitutions in mammals. Like other episodic models such as the doubly stochastic Poisson process, this model accounts for the large variances observed in amino acid substitution rates, but unlike other models, it also accounts for the results of Ohta's (1995) analysis of synonymous and nonsynonymous substitutions in mammalian genes. That analysis yields a power-law increase in the index of dispersion and an inverse power-law decrease in the coefficient of variation with the mean number of substitutions, as predicted by the FSPP model but not by the doubly stochastic Poisson model. This result is compatible with the selection theory of evolution and the nearly-neutral theory of evolution.
Date: May 1997
Creator: Bickel, David R. (David Robert)
Partner: UNT Libraries

Assessment of changes in aquatic macrophyte occurrence following introduction of triploid grass carp in a North Texas reservoir

Description: The objectives of this project were to measure changes in frequency of occurrence of submerged macrophytes over the first two growing seasons following stocking with triploid grass carp at two fish per acre and to measure differences in macrophyte biomass between areas excluded from herbivory and adjacent control sites after 16 months following establishment of exclosures. The project also seeks to measure concentrations of fluridone following the herbicide treatment, and to compare two methods of aquatic vegetation sampling.
Date: August 1997
Creator: Bickel, Ken (Kenneth E.)
Partner: UNT Libraries

Strategy, Structure, and Performance of U.S.-Based Multinational Organizations: A Fit Theory Study

Description: The research question addressed by the study asks, "Is international integration strategic and departmental structural fit a predictor of performance in U.S.-based, single-business multinational organizations?" The study is designed to extend existing research in international integration strategy, which is often called "global strategy," "globalization," or "internationalization" in the popular press and academic research literature.
Date: August 1997
Creator: Blackwell, Rodney D. (Rodney Dean)
Partner: UNT Libraries

An Investigation of the Influence of Evaluator Background on Appraisals of a Music Lesson Using the Texas Teacher Appraisal System

Description: This study's purpose was to investigate the differences in scores and written comments given by two appraisal groups in their evaluation of a music teacher using the Texas Teacher Appraisal System (TTAS). One appraiser group had musical training while the other group specialized in other subjects. Analyses of both group's appraisal scores showed no significant differences. An examination of the written comments revealed that both appraisal groups focused on the same aspects of the lesson and used similar vocabulary. The TTAS instrument was a consistent measure of generic teacher behaviors in the music lesson, but it did not measure specific music teaching behaviors or encourage suggestions for improving musical instruction.
Date: December 1997
Creator: Bohnstengel, Carol
Partner: UNT Libraries

Effects of Performance Levels of Subject Matter Experts on Job Analysis Outcomes

Description: Much research has been undertaken to determine how Subject Matter Expert characteristics affect job analysis outcomes. The current study seeks to discover if performance levels are related to current incumbents ratings of their positions. A group of 114 corporate associates, from two administrative positions, served as Subject Matter Experts (SME) for this study. Separate job analyses for each position were conducted using the Job Analysis Task Checklist. The results for each job were analyzed to determine if SME performance levels affected job analysis outcomes. The results for both jobs showed that there were very few differences in job analysis results as a function of SME performance levels.
Date: December 1997
Creator: Boyd, Charlotte Friedersdorff
Partner: UNT Libraries

Development of a Database Guide for Institutional Research in a Theological Seminary

Description: This study sought to create a guideline to assist theological seminaries build a longitudinal database for institutional research. The study used the National Center for Higher Education Management (NCHEMS) data element dictionary as the base document for the study.
Date: June 1997
Creator: Bratton, Terry L. (Terry Lee)
Partner: UNT Libraries

External and Internal Influences on Congruence Between Sexual Attitudes and Behavior

Description: The purpose of this study was to examine the hypotheses that the external factors of family environment, gender, and clinical status and the internal factors of self-esteem and impression management would have either a positive influence or a negative influence on individuals' congruence between their sexual attitudes and their sexual behavior. The hypotheses that the external and internal factors would be significant predictors of congruence between sexual attitudes and behavior were not supported by regression analyses. Clinical status and impression management were significant predictors of congruence but in the opposite direction than hypothesized. When age was factored out of the regression equation, clinical status was no longer a significant predictor of congruence. However, impression management remained a significant predictor of congruence.
Date: December 1997
Creator: Brewer, Laura C. (Laura Catherine)
Partner: UNT Libraries

Anti-Semitism and Der Sturmer on Trial in Nuremberg, 1945-1946: The Case of Julius Streicher

Description: The central focus of this thesis is to rediscover Julius Streicher and to determine whether his actions merited the same punishment as other persons executed for war crimes. Sources used include Nuremberg Trial documents and testimony, memoirs of Nazi leaders, and other Nazi materials. The thesis includes seven chapters, which cover Streicher's life, especially the prewar decades, his years out of power, and his trial at Nuremberg. The conclusion reached is that Streicher did have some influence on the German people with his anti-Semitic newspaper Der Sturmer, but it is difficult to ascertain whether his speeches and writings contributed directly to the extermination of the Jews in World War II or simply reflected and magnified the anti-Semitism of his culture.
Date: August 1997
Creator: Bridges, Lee H. (Lee Hammond)
Partner: UNT Libraries