UNT Theses and Dissertations - 18,577 Matching Results

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Neckbones and Sauerfowches: From Fractured Childhood in the Ghetto to Constantly Changing Womanhood in the World

Description: A collection of five memoiristic essays arranged about themes of family, womanhood and the African-American community with a preface. Among the experiences the memoirs recount are childhood abandonment; verbal and emotional child abuse; mental illness; poverty; and social and personal change. Essays explore the lasting impact of abandonment by a father on a girl as she grows into a woman; the devastation of family turmoil and untreated mental illness; generational identity in the African-American community. One essay describes the transition from the identity-forming profession of journalism to academia. The last essay is about complicated and conflicting emotions toward patriotism and flag-waving on the part of a black woman who has lived through riots, little known police shootings of students on black campuses, and many other incidents that have divided Americans.
Date: May 2002
Creator: Smith, Starita
Partner: UNT Libraries

Organization of Narrative Discourse in Children and Adolescents with Acute Traumatic Brain Injury

Description: Children with a recent history of TBI often demonstrate impaired memory, which can be affected by impaired attention, processing speed or impaired verbal information processing. The purpose of this study was to determine if qualitative differences exist among the narrative recall of TBI patients that is not adequately accounted for by standard scoring methods. Sixty-six TBI subjects ranging in age from 6 to 16 were given the Wide Range and Memory and Learning (WRAML) Story Memory subtest and selected subtests from the Wechsler Intelligence Scale for Children - Third Edition (WISC-III). Mean elapsed time since injury was 53 days. Recall of the story on the WRAML subtest was hand-recorded by the examiner. A supplemental scoring method accounted for differences in length, errors, and disorganization. Comparisons were made to a randomly selected control group consisting of 16 hospitalized subjects between 7 and 15 years with no history of head injury, neurological condition or event. Findings suggest the WRAML Story Memory subtest is relatively robust in providing information regarding the quality of recall, with the exception of not accounting for the addition of erroneous details. Subjects with both cortical and subcortical injuries were more likely to add superfluous details to their stories. Results also demonstrated significant differences between the TBI subjects and control group in how well the stories were recalled, primarily in the order of details recalled and in retention after a 30 minute delay. Location was not a significant predictor of narrative organization. Although using this comprehensive supplemental scoring system a regular basis has practical limitations, hand-recording the narrative takes relatively little time and does appear to provide useful additional information concerning the nature of the child's verbal memory difficulties. Furthermore, the more knowledgeable the child, parents and teacher are about these difficulties and about remediation strategies, the more likely ...
Date: May 2002
Creator: Thomas, Kathy Lee
Partner: UNT Libraries

La Primavera: Concertino for English Horn and Chamber Orchestra

Description: La Primavera: Concertino for English Horn and Chamber Orchestra is a work in a traditional chamber orchestra instrumentation: single woodwinds (flute, oboe, clarinet, and bassoon), two French horns, trumpet, timpani and strings. A through-composed work of 14 minutes in duration, the Concertino is conceptually based on the idea that spring is not the first of the seasons, but rather the last. As a result, all of its motivic materials are organically linked to one another, and function as paired forces that struggle for supremacy. The introduction of the third motive functions as a motivic synthesis, since it contains intrinsic elements of previous motives. There are several important compositions based on the topic of the seasons among them we find: Vivaldi's Concerto Grosso Le Quatro Staggione, Haydn's oratorio The Seasons, and Piazzola's chamber work Las Estaciones. While researching this topic, the conceptual dilemma of spring as the last season was considered. This became a turning point in the compositional process strong enough to consider the spring as a singular topic of interest. The analysis of this work through Derrida's Deconstruction theory first came to me while reading Rose Rosengerd Subotnick's Deconstructive Variations: Music and Reason in Western Society. The Linguistic approach, was inspired in part by Leonard Bernstein's lecture “The Unanswered Question,” and Jean J. Nattiez's Music and Discourse: Toward a Semiology of Music.
Date: May 2002
Creator: Esperilla Garcia, Efrain Ernesto
Partner: UNT Libraries

Reproductive Health in Yemen: A Theoretical Approach

Description: Several developing countries introduced family planning programs to reduce their population growth rates. The rapid spread of birth control programs in the developing countries was at times accompanied by measures which violated human rights. In response to the ethical violations and coercive policies on population control, toward the end of 1980s various international committees formulated a reproductive health approach to overcome the limited population control approach. Unlike other population control programs, the focus of reproductive health program is on “reproductive process,” where as the most immediate focus of family planning programs is on fertility. Although studies refer to reproductive health approach as an extension of fertility control approach, literature on reproductive health provides very few systematic approaches toward developing explanations of reproductive health. The current approaches on population control are influenced by the ideological shift towards a broad-based approach which involves fertility or family size as one of the components of reproductive health. The present study uses intermediate variables framework suggested by Davis and Blake to organize reproductive health explanations. The proposed framework suggests that the state of reproductive health is indicated by intercourse, conception, and gestation variables and assumes that reproductive health is a latent dimensional outcome indicated by the measures of the intermediate variables. Also, there is noticeable lack of studies on reproductive health in Muslim countries. Given this shortcoming in the literature on reproductive health, the proposed model on reproductive health is used to assess the reproductive health of women in Yemen. The data are from the Yemen Demographic and Maternal and Child Health Survey (YDMCHS) conducted in 1997. Structural equation analysis is used to analyze the data. It is found that gender power or women's empowerment is more influential than economic status in determining reproductive health outcomes. The results of the study provide support for the ...
Date: May 2002
Creator: Sunil, Thankam Sukumaran
Partner: UNT Libraries

Smoothing the information seeking path: Removing representational obstacles in the middle-school digital library.

Description: Middle school student's interaction within a digital library is explored. Issues of interface features used, obstacles encountered, search strategies and search techniques used, and representation obstacles are examined. A mechanism for evaluating user's descriptors is tested and effects of augmenting the system's resource descriptions with these descriptors on retrieval is explored. Transaction log data analysis (TLA) was used, with external corroborating achievement data provided by teachers. Analysis was conducted using quantitative and qualitative methods. Coding schemes for the failure analysis, search strategies and techniques analysis, as well as extent of match analysis between terms in student's questions and their search terms, and extent of match analysis between search terms and controlled vocabulary were developed. There are five chapters with twelve supporting appendixes. Chapter One presents an introduction to the problem and reviews the pilot study. Chapter Two presents the literature review and theoretical basis for the study. Chapter Three describes the research questions, hypotheses and methods. Chapter Four presents findings. Chapter Five presents a summary of the findings and their support of the hypotheses. Unanticipated findings, limitations, speculations, and areas of further research are indicated. Findings indicate that middle school users interact with the system in various sequences of patterns. User groups' interactions and scaffold use are influenced by the teacher's objectives for using the ADL. Users preferred to use single word searches over Boolean, phrase or natural language searches. Users tended to use a strategy of repeating the same exact search, instead of using the advanced scaffolds. A high percent of users attempted at least one search that included spelling or typographical errors, punctuation, or sequentially repeated searches. Search terms matched the DQ's in some instantiation 54% of all searches. Terms used by the system to represent the resources do not adequately represent the user groups' information needs, however, ...
Date: May 2002
Creator: Abbas, June M.
Partner: UNT Libraries

Sonata for Piano (1963) by Sergei Michailovich Slonimsky: Musical Analysis and Discussion on Interpretation and Performance

Description: The essay begins with the overview of Russian-Soviet piano music from the second half of the 19th century to the end of the 20th century. Then, biographical information about Sergei Slonimsky and an overview of his major compositions is provided. The majority of the paper focuses on Slonimsky's Sonata for Piano (1963). A brief discussion of the Sonata's compositional history is followed by the formal analysis of the overall structure of the work. Slonimsky's original principle of organization of the music is emphasized: the system of constant interrelation of the main thematic material combined with elements of the sonata-allegro form. In the analysis of the harmonic language of the piece, the composer's extensive use of Russian folk elements such as diatonic melodies, sigh motives, parallel triads, and simultaneous use of the lower third with the major triad is pointed out. The rest of the paper focuses on issues of interpretation and performance. Special notice is given to the problem of incorporating a percussive type of playing with the elements of folk cantilena singing. The paper concludes with the history of Sonata's performances and a discussion of current recordings.
Date: May 2002
Creator: Fitenko, Nikita
Partner: UNT Libraries

Strategic Versus Sincere Behavior: The Impact of Issue Salience and Congress on the Supreme Court Docket

Description: The theory proposed here is that the Supreme Court behaves in a strategic manner at the agenda-setting stage in order to vote sincerely on the merits. To test this, I measure the impact issue salience and ideological distance between Congress and the Supreme Court has on the agenda. The results indicate that whether the Supreme Court behaves either sincerely or strategically depends on the policy area. The strategic nature of the Supreme Court at the agenda-setting phase may be in large part why some research shows that the Court behaves sincerely when voting on the merits. By behaving strategically at the agenda-setting phase, the Court is free to vote sincerely in later parts of the judicial process.
Date: May 2002
Creator: Williams, Jeffrey David
Partner: UNT Libraries

A Study of Perceptually Tuned, Wavelet Based, Rate Scalable, Image and Video Compression

Description: In this dissertation, first, we have proposed and implemented a new perceptually tuned wavelet based, rate scalable, and color image encoding/decoding system based on the human perceptual model. It is based on state-of-the-art research on embedded wavelet image compression technique, Contrast Sensitivity Function (CSF) for Human Visual System (HVS) and extends this scheme to handle optimal bit allocation among multiple bands, such as Y, Cb, and Cr. Our experimental image codec shows very exciting results in compression performance and visual quality comparing to the new wavelet based international still image compression standard - JPEG 2000. On the other hand, our codec also shows significant better speed performance and comparable visual quality in comparison to the best codec available in rate scalable color image compression - CSPIHT that is based on Set Partition In Hierarchical Tree (SPIHT) and Karhunen-Loeve Transform (KLT). Secondly, a novel wavelet based interframe compression scheme has been developed and put into practice. It is based on the Flexible Block Wavelet Transform (FBWT) that we have developed. FBWT based interframe compression is very efficient in both compression and speed performance. The compression performance of our video codec is compared with H263+. At the same bit rate, our encoder, being comparable to the H263+ scheme, with a slightly lower (Peak Signal Noise Ratio (PSNR) value, produces a more visually pleasing result. This implementation also preserves scalability of wavelet embedded coding technique. Thirdly, the scheme to handle optimal bit allocation among color bands for still imagery has been modified and extended to accommodate the spatial-temporal sensitivity of the HVS model. The bit allocation among color bands based on Kelly's spatio-temporal CSF model is designed to achieve the perceptual optimum for human eyes. A perceptually tuned, wavelet based, rate scalable video encoding/decoding system has been designed and implemented based on this ...
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Date: May 2002
Creator: Wei, Ming
Partner: UNT Libraries

Supply chain relationships in apparel retail product development.

Description: The purpose of this study was to investigate supply chain relationships within the apparel retail product development process under a single site case study setting. Relationship determinants (i.e. drivers, facilitators and barriers) that facilitated or impeded the degree of collaborative efforts between the retailer and the supply chain members were identified. As the retailer integrated its product development process with its suppliers, a triangular relationship was formed between the retailer, the overseas manufacturers, and the designated suppliers. The study found that the retailer sought operational efficiency in its business relationships with supply chain members, but continued to seek long-term commitment in these relationships to establish a virtual vertical company.
Date: May 2002
Creator: Lee, Daton
Partner: UNT Libraries

Synthesis of Crown Ether/Ammonium Salt for Electron Transfer Study

Description: The theoretical model of Beratan and Onuchic predicts a large attenuation of ET rates through hydrogen bonds; however, the effect of individual hydrogen bond on electron transfer reaction has not been systematically studied. The organic complexes in this study are a series of crown ether/ammonium salt, which incorporate a redox partner on each component of the complex. The dimethoxynaphthalene redox donor was attached to the crown ether and a series of ammonium salts was synthesized which bear substituted quinone and naphthoquinone acceptor. The complexes characterization and preliminary electron transfer rate measurement were completed with UV/Vis and steady-state emission spectroscopy.
Date: May 2002
Creator: Han, Dong
Partner: UNT Libraries

Teacher-directed student use of the Internet for curricular activities: Profiles of frequent and infrequent use.

Description: The purpose of this study was to develop profiles that described teachers with infrequent and frequent teacher-directed student use of the Internet for curricular purposes. Responses to the teachers' self-reported needs, beliefs, demographics, Internet skill levels, and other information were examined as the basis for the study. The study was descriptive in nature, utilized correlation and causal-comparative methods, and employed a convenience sample. The population consisted of 3,187 public school teachers from Nebraska and four service regions in upstate New York. Data related to the research questions were gathered using an online survey. After minimum access was determined, frequencies, percentages, t tests, and correlations were used to examine the data. Teachers with infrequent (<15 mins. /week) teacher-directed student use of the Internet comprised 63% of the sample. Teachers from elementary and high school levels were almost equally represented in the infrequent use group. The majority of the high school level teachers were assigned to language arts, mathematics or science courses. Teachers in the frequent (>. 90 mins. /week) use group were predominately (75%) high school level, with the majority teaching computer and business subjects. Significant differences were found between the use groups regarding beliefs about the Internet's effect on students and schools and feelings about designing lessons that included the Internet or technology. Within the infrequent use group, significant correlations were found between comparative Internet skill levels and (a) hours of technology-related professional development and (b) willingness to use the Internet for professional development. Further study should be given to the question of how these differences and correlations may affect the amount of teacher-directed student use of the Internet. The profiles developed in this study provide a starting point to assist regional, district, and school-level personnel in assessing local needs and focusing resources on developing strategies to increase teacher-directed student ...
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Date: May 2002
Creator: Charles, Joan T.
Partner: UNT Libraries

Team performance: Using financial measures to evaluate the effect of support systems on team performance.

Description: Organizations invest in team-based systems in order to generate innovative practices that will give them a competitive edge. High-performing teams require training and other support systems to gain the skills they need as well as to create and maintain an environment conducive to their success. The challenge for managers is to make resource allocation decisions among investment alternatives to maximize team effectiveness and still ensure a financial return for company investors. This study has three objectives. The first objective is to investigate whether there is a positive relationship among organizational environment, team potency (the team's collective belief it will succeed) and team performance. Results indicate that the presence of four organizational support systems influences team potency and performance. These support systems are the Design and Measurement, Rewards, Training and Communications Systems. In addition, results indicate that team potency is a mediating variable between the Design and Measurement and Communications Systems and team performance. These results suggest that companies are able to influence team performance by investing in environmental support systems. The second objective is to examine whether team members and managers view the organizational environment differently. Results indicate that managers view the Training and Communications Systems as more important, while teams perceive the Design and Measurement System and the Rewards System to be more important to their success. Since the systems that team managers view as important may influence their investment decisions, these differences may suggest a resource alignment issue. Third, a measure of team effectiveness based on financial measures is introduced. Published literature emphasizes attitudinal, behavioral and operational measures of performance. A financial measure offers a method of evaluating performance that is similar to methods used in capital budgeting and may be consistently applied across different types of teams with different purposes. The data collection process was performed by ...
Date: May 2002
Creator: Kennedy, Frances Anne
Partner: UNT Libraries

Texas Public School Principals' Application of Procedures in Identification and Prevention of Sexual Harassment

Description: The procedural survey on sexual harassment procedures sent to 300 Texas principals had a response rate of 48.3 %. The mean score on the procedural survey for all 300 principals was 69.30 %. Eighteen research questions were addressed in detail in Chapter 4. Only five showed a significant correlation or effect size. Question 5 asked if there was a correlation between gender and the mean score of the survey instrument regarding sexual harassment procedures. The mean score of women was significantly higher than men. Question 6 asked if there was a correlation between the number of students in a school and the mean score of the survey instrument regarding sexual harassment procedures. This revealed that a significant correlation appeared between principals who worked at larger schools. Question 10 asked if there was a correlation between the location of the school, whether rural, urban, or metroplex and the mean score of the survey instrument. Principals of urban and metroplex schools scored significantly higher. Question 13 asked if there was a correlation between the hours of sexual harassment training attended in the last year and the mean score of the survey instrument regarding sexual harassment procedures. The results of this analysis revealed that a correlation approaching a medium effect size of .237 was present. Question 18 asked if there was a correlation between the total number of hours a principal had attended training and the mean score of the survey instrument. Neither the Pearson's correlation or the Spearman's rho was statistically significant. However, due to the large variation in responses on the sum of hours of training about sexual harassment, it was suspected that there might be a covariate accounting for sub-populations within the principals who participated in the survey. For ages 30-43.5, as the number of total training hours increased, the ...
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Date: May 2002
Creator: Cramer, Conita K. Markel
Partner: UNT Libraries

The Use of Genetic Polymorphisms and Discriminant Analysis in Evaluating Genetic Polymorphisms as a Predictor of Population

Description: Discriminant analysis is a procedure for identifying the relationships between qualitative criterion variables and quantitative predictor variables. Data bases of genetic polymorphisms are currently available that group such polymorphisms by ethnic origin or nationality. Such information could be useful to entities that base financial determinations upon predictions of disease or to medical researchers who wish to target prevention and treatment to population groups. While the use of genetic information to make such determinations is unlawful in states and confidentiality and privacy concerns abound, methods for human “redlining” may occur. Thus, it is necessary to investigate the efficacy of the relationship of certain genetic information to ethnicity to determine if a statistical analysis can provide information concerning such relationship. The use of the statistical technique of discriminant analysis provides a tool for examining such relationship.
Date: May 2002
Creator: Howell, Bruce F.
Partner: UNT Libraries

Use of the Beck Depression Inventory in Northern Brazil

Description: The Beck Depression Inventory (BDI) is a popular screening and research instrument for measuring severity of depression. The instrument was translated to Portuguese for use in Brazil in 1979; however, it was not until recently that its psychometric properties have been tested empirically for the Brazilian population. The purpose of the present study was to explore the BDI's psychometric properties in a northern region of Brazil and to test for possible relationships between certain demographic variables and BDI outcomes. Samples used in this study were from an urban area in Roraima, the northernmost state of Brazil. The BDI showed adequate levels of internal consistency in nonclinical and clinical samples. Female respondents had significantly higher scores than male respondents. Those who had lower levels of education, income, or occupational status had significantly higher scores than those with higher levels of these variables. Adolescents had significantly higher scores than adults from all age groups except those from age 19 to 22. No significant difference was found between those who identified themselves as “indigenous” and those who identified themselves as “non-indigenous.” Regression analysis results showed that the combination of gender, education, and age best accounted for the variance in BDI scores. An ANCOVA revealed that clinically depressed adults had significantly higher BDI scores than nonclinically depressed adults. Factor analysis results showed that there were two main factors in the item structure for both female respondents and male and female respondents combined: one factor of mainly cognitive-affective items and the other factor of mainly somatic items. The results were discussed in terms of the future use of the BDI in Brazil.
Date: May 2002
Creator: Albert, Christopher
Partner: UNT Libraries

When shape becomes a sign: narrative design in creative nonfiction.

Description: This thesis consists of a preface and three original short stories. The preface explores the idea that narrative designthe shape or structureof a story may become a literary motif in its own right. The three stories included are creative nonfiction and each employs a distinct modular design. The themes of the stories revolve around personal identity and values; families and marriage; and creative empowerment.
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Date: May 2002
Creator: Hale, Bonnie
Partner: UNT Libraries

Working Whiteness: Performing And Transgressing Cultural Identity Through Work

Description: Early in Richard Wright's Native Son, we see Bigger and his friend Gus &#8220;playing white.&#8221; Taking on the role of &#8220;J. P. Morgan,&#8221; the two young black men give orders and act powerful, thus performing their perceived role of whiteness. This scene is more than an ironic comment on the characters' distance from the lifestyle of the J. P. Morgans of the world; their acts of whiteness are a representation of how whiteness is constructed. Such an analysis is similar to my own focus in this dissertation. I argue that whiteness is a culturally constructed identity and that work serves as a performative space for defining and transgressing whiteness. To this end, I examine work and its influence on the performance of middle class and working class whiteness, as well as how those outside the definitions of whiteness attempt to &#8220;play white,&#8221; as Bigger does. Work enables me to explore the codes of whiteness and how they are performed, understood, and transgressed by providing a locus of cultural performance. Furthermore, by looking at novels written in the early twentieth century, I am able to analyze characters at a historical moment in which work was of great import. With the labor movement at its peak, these novels, particularly those which specifically address socialism, participate in an understanding of work as a performative act more than a means to end. Within the context of this history and using the language of whiteness studies, I look at how gendered whiteness is transgressed and reinforced through the inverted job-roles of the Knapps in Dorothy Canfield's The Home-Maker, how work can cause those who possess the physical attributes of whiteness to transgress this cultural identity, as the Joads in The Grapes of Wrath demonstrate, and how the ascribed identities as non-white for Sara in The ...
Date: May 2002
Creator: Polizzi, Allessandria
Partner: UNT Libraries

Accounting for Human Resources: Implications for Theory and Practice.

Description: Knowledge workers are an important resource for the typical modern business firm, yet financial reporting ignores such resources. Some researchers contend that the accounting profession has stressed reliability in order to make the accounting appear objective. Others concur, noting that accounting is an insecure profession and adopts strict rules when faced with uncertainty. Accountants have promulgated a strict rule to expense human resource costs, although many know that such resources have future benefits. Some researchers suggest that any discipline must modify its language in order to initiate change toward providing useful social ameliorations. If accounting theorists extend this idea to the accounting lexicon.s description of investments in human resources, investors and other accounting user groups might gain greater insight into how a firm fosters and nourishes human capital. I tested three hypotheses related to this issue by administering an experiment designed to assess financial analysts. perceptions about alternative financial statement treatments of human resources in an investment recommendation task. I predicted that (1) analysts' perceptions of the reliability (relevance) of the information they received would decrease (increase) as the treatment of human resources increasingly violated GAAP (became more current-oriented), (2) analysts exposed to alternative accounting treatments would report a lower likelihood of recommending that their clients invest in the company in the task, and (3) financial analysts who ranked reliability (relevance) as a more important information quality would be less (more) likely to recommend that their clients buy the stock represented in the case because the treatment of human resources on the financial statements violated GAAP (was more current-oriented) as compared to analysts who ranked reliability (relevance) as being lower (higher) in importance. Analysts receiving financial statements with accounting treatments of human resource costs that violated GAAP judged such information as less reliable and were also less likely to recommend ...
Date: December 2001
Creator: Stovall, Olin Scott
Partner: UNT Libraries

An Analysis of Sales People's Perceptions of Performance Appraisal Criteria at a Telecommunications Corporation.

Description: The purpose of this study was to identify and analyze sales people's perceptions of performance appraisal criteria in a telecommunications corporation. The study was prompted by the perceived disillusionment of the sales people with the current performance appraisal criteria. The perceptions of 67 sales people were assessed using a questionnaire developed by the researcher. One-way analysis of variance procedures (ANOVA) were used to determine if there were statistically significant differences in premise and telemarketing sales people's perceptions of performance appraisal criteria. Findings indicated that there were no statistically significant difference in premise and telemarketing sales people's perceptions of the 38 performance appraisal criteria statements. Findings did not indicate a statistically significant difference in premise and telemarketing sales people's perceptions of the performance criteria statements, the attitude or satisfaction statements, and the peripheral issue statements. Based on this study, the sales people appear to have clear perceptions of the performance appraisal criteria.
Date: December 2001
Creator: Harris, Ellen L.
Partner: UNT Libraries

Attitudes of American and Korean Early Childhood Educators Regarding Programs for Gifted/Talented Young Children.

Description: The purpose of this research was to study the attitudes of Korean and American early childhood educators concerning gifted children and programs aimed specifically at meeting their needs. The study examined general attitudes towards giftedness and gifted education programs and factors that might affect those attitudes. The study also examined desirable environments for young gifted children. Twenty-item questionnaires were developed and logically divided into six sections (identification, teacher environment, classroom environment, parent environment, educational rights, and program). A systematic process of development, analysis, and refinement of the questionnaire was done. The questionnaires were given randomly to American educators attending the 1996 National Association for the Education of Young Children (NAEYC) conference. A random Korean sample included early childhood educators listed in the Korean Association for Early Childhood Education Directory (1995-1996) and the Korean Association for Child Care Directory (1995-1996). All subjects were members of one of three groups: (a) teacher educators, (b) teachers, and (c) administrators/directors. The surveys found agreement between Korean and American early childhood educators on the importance of knowing the strengths of individual gifted children, the need to stimulate higher order thinking skills, the rights of gifted children to an appropriate education, a perception of more work for the teacher to add these options, and a feeling that gifted programs would be difficult because of the large number of children in classes. The teachers also agreed that it is not difficult to assess or identify gifted preschoolers and having programs for the gifted is not elitist, but that parents should have the main responsibility for meeting the needs of gifted preschoolers and that many gifted strategies are good for all children.
Date: December 2001
Creator: Song, Kyu-Woon
Partner: UNT Libraries

Borel Determinacy and Metamathematics

Description: Borel determinacy states that if G(T;X) is a game and X is Borel, then G(T;X) is determined. Proved by Martin in 1975, Borel determinacy is a theorem of ZFC set theory, and is, in fact, the best determinacy result in ZFC. However, the proof uses sets of high set theoretic type (N1 many power sets of ω). Friedman proved in 1971 that these sets are necessary by showing that the Axiom of Replacement is necessary for any proof of Borel Determinacy. To prove this, Friedman produces a model of ZC and a Borel set of Turing degrees that neither contains nor omits a cone; so by another theorem of Martin, Borel Determinacy is not a theorem of ZC. This paper contains three main sections: Martin's proof of Borel Determinacy; a simpler example of Friedman's result, namely, (in ZFC) a coanalytic set of Turing degrees that neither contains nor omits a cone; and finally, the Friedman result.
Date: December 2001
Creator: Bryant, Ross
Partner: UNT Libraries

The Characteristics of Teacher-Directed Modeling Evidenced in the Practices of Three Experienced High School Choral Directors.

Description: The purpose of this study was to analyze the characteristics of teacher directed modeling evidenced in the practices of three experienced high school choral directors. Research questions were: 1. What modeling activities were exhibited in each teacher's rehearsals? 2. When viewing a 45-minute composite tape of each teacher's instructional activities representative of all rehearsals, what instructional behaviors did each choral director recognize and identify as modeling? 3. What instructional episodes on the composite tape not identified by the teachers contained elements of modeling? 4. What other episodes from the remainder of each choral director's rehearsal practice contributed to an understanding of modeling? Videotapes of three high school choral directors were recorded over the course of one semester. Excerpts from rehearsals were combined to form a 45-minute composite tape of each choral director. A text transcription was made of the composite tape. Participant directors viewed their tape and identified instructional episodes that they recognized as examples of modeling. Identifications were analyzed, and descriptive categories of modeling behaviors were established. Modeling was found to be a teacher generated or delegated act of demonstration. Demonstrations were musical or non-musical and belonging to either of three distinct categories: audible, visible, or process modeling. Subdivisions of each category were found further describing modeling in the high school choral rehearsal. In addition, types of modeling were noted in increasing cognitive complexity required on the part of students beginning with simple imitation and concluding with models as tools for musical problem solving. Research is recommended on a larger sample of participants, including junior high/middle school directors to confirm categories and levels and to develop an observation tool based on results for describing, assessing, and modifying instructional techniques of practicing and pre-service music educators.
Date: December 2001
Creator: Grimland, Fredna H.
Partner: UNT Libraries

Characterization of Moraxella bovis Aspartate Transcarbamoylase

Description: Aspartate transcarbamoylase (ATCase) catalyzes the first committed step in the pyrimidine biosynthetic pathway. Bacterial ATCases have been divided into three classes, class A, B, and C, based on their molecular weight, holoenzyme architecture, and enzyme kinetics. Moraxella bovis is a fastidious organism, the etiologic agent of infectious bovine keratoconjunctivitis (IBK). The M. bovis ATCase was purified and characterized for the first time. It is a class A enzyme with a molecular mass of 480 to 520 kDa. It has a pH optimum of 9.5 and is stable at high temperatures. The ATCase holoenzyme is inhibited by CTP > ATP > UTP. The Km for aspartate is 1.8 mM and the Vmax 1.04 µmol per min, where the Km for carbamoylphosphate is 1.05 mM and the Vmax 1.74 µmol per min.
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Date: December 2001
Creator: Hooshdaran, Sahar
Partner: UNT Libraries

Characterization of the Aspartate Transcarbamoylase that is Found in the pyrBC’ Complex of Bordetella Pertussis

Description: An aspartate transcarbamoylase (ATCase) gene from Bordetella pertussis was amplified by PCR and ligated into pT-ADV for expression in Escherichia coli. This particular ATCase (pyrB) was an inactive gene found adjacent to an inactive dihydroorotase (DHOase) gene (pyrC'). This experiment was undertaken to determine whether this pyrB gene was capable of expression alone or if it was capable of expression only when cotransformed with a functional pyrC'. When transformed into E. coli TB2 pyrB-, the gene did not produce any ATCase activity. The gene was then co-transformed into E. coli TB2 pyrB- along with a plasmid containing the pyrC' gene from Pseudomonas aeruginosa and assayed for ATCase activity. Negative results were again recorded.
Date: December 2001
Creator: Dill, Michael T
Partner: UNT Libraries