307 Matching Results

Search Results

Multiresolutional/Fractal Compression of Still and Moving Pictures

Description: The scope of the present dissertation is a deep lossy compression of still and moving grayscale pictures while maintaining their fidelity, with a specific goal of creating a working prototype of a software system for use in low bandwidth transmission of still satellite imagery and weather briefings with the best preservation of features considered important by the end user.
Date: December 1993
Creator: Kiselyov, Oleg E.
Partner: UNT Libraries

Eutrophication Monitoring and Prediction

Description: Changes in trophic status are often related to increases or decreases in the allocthonous inputs of nutrients from changes in land use and management practices. Lake and reservoir managers are continually faced with the questions of what to monitor, how to monitor it, and how much change is necessary to be considered significant. This study is a compilation of four manuscripts, addressing one of these questions, using data from six reservoirs in Texas.
Date: December 1993
Creator: Cairns, Stefan H., 1949-
Partner: UNT Libraries

A Comparison of the Relative Effectiveness of Mainstream Versus Pullout Treatment Programs in Addressing the Needs of At-Risk Students

Description: The purpose of the study was to compare the relative benefits of treating at-risk students, those considered to be potential dropouts, by separating them into special classes at a separate facility—a pullout program—versus having them remain in regular classes with periodic supplemental counseling based upon individual needs—a mainstream program. To carry out the purpose of the study, students enrolled in the two types of treatment programs were compared in respect to retention in school, attendance, academic achievement based upon pretest and posttest scores, report card grades, and attitude toward school.
Date: December 1993
Creator: Harrison, Robert S. (Robert Seidel)
Partner: UNT Libraries

Modeling State Repression in Argentina and Chile: A Time Series Analysis

Description: This study is an attempt to contribute to the emerging theoretical literature on state repression. A time-series model was developed to test the hypothesis that state violence in Argentina and Chile is largely a function of four internal political factors and their interactions: 1) the inertial influence of past restrictive policies on the formulation of current policies, 2) the annual incidence of political protest demonstrations, 3) the perceived effectiveness of repressive measures on unrest, 4) and the institutionalization of military rule.
Date: December 1993
Creator: King, John Christopher
Partner: UNT Libraries

State Participation in Funding Capital Projects and Improvements in Texas Public Schools

Description: The impact of four basic capital project funding models for state participation was determined for the school districts in Texas. A review of the historical background for funding of capital projects and improvements by states was followed by a review of the historical background of state support for funding capital projects in the State of Texas. Additionally, the current funding models and methods of determining need were reviewed for all of the states. This historical review revealed that facility funding, like aid for maintenance and operation, has evolved with all the states at different stages.
Date: December 1993
Creator: Hawkins, Jimmy R. (Jimmy Ray)
Partner: UNT Libraries

From Knowing Content to Constructing Knowledge: A Trend Analysis of Secondary Science Education, 1953-1992

Description: The purpose of this study was to identify and analyze secondary science education curriculum and instruction trends for the period 1953-1992 by using the technique of content analysis to examine a representative portion of journal articles and policy statements in secondary science education. Two major science publications, The Science Teacher and Science Education, were selected for analysis.
Date: December 1993
Creator: Kelly, Janet Arlene
Partner: UNT Libraries

A Role Modification Model: the Foreign Policy of the Palestine Liberation Organization, 1964-1981

Description: This study is a Comparative Foreign Policy (CFP) analysis of the Palestine Liberation Organization's (PLO) foreign policy behavior from 1964 through 1981. This study develops and tests a role modification model that accounts for evolutionary changes in foreign policy behavior. One of the major premises of this research is that what often appears as dramatic restructuring in foreign policy is actually the culmination of a series of modifications that transpired over an extended period of time. The model relies on a total of six independent variables as determinants of PLO foreign policy output representing multiple levels of analysis. There are a total of 12 dependent variables expressed as either foreign policy tactical roles or strategic goals. Relying on content analysis of relevant PLO documents, the role modification model demonstrates that the foreign policy output of the PLO experienced a gradual, over time change in both the means and ends of its foreign policy. The model also identifies the conditions under which any one of the independent variables is able to exclusively determine foreign policy output and which roles one can reasonably expect the PLO to exercise under a given circumstance.
Date: December 1993
Creator: DiGeorgio-Lutz, JoAnn A. (JoAnn Angela)
Partner: UNT Libraries

Young Children's Construction of Physical Knowledge on Swings in the Outdoor Play Environment

Description: This investigation examined the development of young children's behaviors on swings in the outdoor play environment and their emerging understanding of the physics principles associated with those behaviors. The children's language interactions were also examined in an effort to determine the relationship between language and cognitive development in their construction of physical knowledge. The procedures involved observing the children's behaviors and collecting samples of their spontaneous language interactions during their swinging activities. Informal interviews were also conducted with individual and groups of children. The findings indicate that young children's swinging behaviors develop in eight hierarchical stages. As these behaviors develop, children experiment with the physics principles of balance, gravity, force, resistance, and resonance. Children's swinging behaviors develop in a social context. Many early behaviors are acquired through observing and modeling other children. Language provides the medium for more-experienced peers to assist novice swingers through encouragement and direct instruction. The stage development of swinging behaviors is compared to Cratty's Theory of Perceptual-Motor Development and Harrow's Taxonomy of the Psychomotor Domain. Children's cognitive processing and language interactions are discussed in the context of Piagetian and Vygotskian theories of development. Implications for instruction and suggestions for further research are discussed.
Date: December 1993
Creator: Fox, Jill Englebright
Partner: UNT Libraries

Functional Properties and Organization of Primary Somatosensory Cortex

Description: The physiological characteristics and organization of cat primary somatosensory cortex (SI) were studied in electrophysiological and anatomical experiments. In single cell recording experiments, quantitatively controlled mechanical stimuli were used to examine the responses of SI cortical neurons to the velocity component of skin or hair displacement. The firing frequency of most rapidly adapting neurons increased as stimulus velocity was increased. Rapidly adapting neurons were classified based on their response patterns to constant-velocity ramp stimuli. Neurons in these classes differed significantly in sensitivity to stimulus velocity and amplitude, adaptation rate, and spontaneous firing rate. The results suggest that frequency coding of stimulus displacement velocity could be performed by individual SI rapidly adapting neurons, and that the classes of rapidly adapting neurons may play different roles in sensation of tactile stimuli. Tract-tracing experiments were used to investigate the ipsilateral corticocortical connections of areas 3b and 2 in SI. Different patterns of connections were found for these areas: area 2 projects to areas 3b, 1, 3a, 5a, 4 and second somatosensory cortex (SII), and area 3b projects to areas 2, 1, 3a and SII. To further compare the organization of these areas, the thalamic input to the forepaw representation within each area was studied. The forepaw region in area 3b receives thalamic input exclusively from ventroposteriopr lateral nucleus (VPL), while area 2 receives input from VPL, medial division of the posterior complex (PoM), and lateral posterior nucleus (LP). These results suggest that area 2 lies at a higher position in the hierarchy of somatosensory information flow.
Date: December 1993
Creator: Esteky, Hossein
Partner: UNT Libraries

An Investigation of Heart Response During Trumpet Playing

Description: The purpose of this study was to investigate the effects of trumpet playing upon the heart. A Holter monitor was used to record electrocardiograms (ECGs) to examine the heart's response during musical performances and practice sessions.
Date: December 1993
Creator: Hunsaker, Leigh Anne
Partner: UNT Libraries

A Criterion-Referenced Analysis of Form F of the Standardized Bible Content Tests of the American Association of Bible Colleges

Description: The purposes of this study were to: (a) analyze subjects' responses from Form F of the Standardized Bible Content Tests of the American Association of Bible Colleges by factor analysis and the Rasch measurement model and (b) determine dimensionality of Form F, determine the correlation to the Literal, Anti-literal, Mythological Scales, and determine the best criterion-referenced test design of Form F using Rasch measurement procedures. Volunteers from a purposefully selected sample of nine colleges from the American Association of Bible Colleges participated in the study. One research instrument with five demographic questions, the Standardized Bible Content Test Form F, and the Literal, Anti-literal, and Mythological Scales was administered to 179 volunteer graduating seniors. Frequencies and percentages of responses were computed for the demographic questions. Mean scores on the Literal, Anti-literal, and Mythological Scales were computed for gender and religious affiliation. Principal components analysis of Form F with varimax rotation and list-wise deletion of missing data was used to assess the dimensionality of Form F. Correlations between scores on the Literal, Anti-literal and Mythological Scales and scores from the principal components analysis of Form F were computed. Dunn's multiple comparison procedures were used to test for statistical significance. Rasch-Model measurement analysis of the scales extracted by principal components analysis was accomplished to obtain suggested target description, test design, variable definition, and item calibration.
Date: December 1993
Creator: Gaede, Charles S. (Charles Samuel)
Partner: UNT Libraries

Body Image as Mediated by Age, Sex, and Relationship Status

Description: Traditionally, body image research has focused on young women. However, there are indications of cultural shifts which extend physical appearance pressures to both men and women, as well as to middle-aged and older adults. Two hundred and ten subjects were administered objective body image measures including the Figure Rating Scale, the Body Shape Questionnaire, and the Multidimensional Body-Self Relations Questionnaire, as well as projective measures including the Holtzman Inkblot Technique and the Draw-A-Person. The NEO-Five Factor Inventory and the Social Anxiety Subscale were also used to explore variables which might covary with body image. A 3 X 2 X 2 Multivariate Analysis of Covariance (MANCOVA) was utilized with social desirability as the covariate.
Date: December 1993
Creator: Cooper, Caren C. (Caren Connie)
Partner: UNT Libraries

An Investigation of the Perception of Delivered Quality at Different Levels of Organizational Hierarchy in Services

Description: The overall purpose of this research was to add to existing theory of quality pertaining to the service provider's perception of quality. Quality in the service industry is difficult to assess because of the intangible, heterogeneous and labor intensive nature of services. In addition, personnel have varying perceptions of delivered quality based on their position within the organizational hierarchy. This study enhanced the Service Quality Model developed by Zeithaml, Berry, and Parasuraman (1988). An additional gap ("gap 6") was hypothesized and investigated. This gap describes the differences in perceived delivered quality by employees at different organizational levels (e.g., managerial, supervisory, and non-management employees) across different market segments. The researcher proposed that "gap 6" has a significant impact on total perceived delivered quality. The survey instrument addressed five dimensions of overall quality: tangibles, reliability, responsiveness, assurance, and empathy. The survey was administered to employees from hotels representing three market segments located within the same metropolitan area and managed by the same company. A 3 X 3 factorial design was used with three organizational levels (managers, supervisors, and hourly employees) and three lodging market segments (luxury, business-traveller, and long-term/suite). Data analyses included descriptive statistics, analysis of variance (ANOVA), and Tukey's Multiple Comparison Test.
Date: December 1993
Creator: Getty, Juliet M. (Juliet Margolin)
Partner: UNT Libraries

The Impact of Student Thinking Journals and Generic Problem Solving Software on Problem Solving Performance and Transfer of Problem Solving Skills

Description: This study examined the effects of specially designed thinking journal activities that have been attributed with encouraging reflective thinking, on instruction using generic, or content-free problem solving software. Sixty-three fourth grade students participated in four instructional sessions using a software package called Moptown Hotel. Students completed separate posttests that measured (1) performance on problems of the same kind as those used in instruction, and (2) transfer of skills to other kinds of problems. Scores of students who wrote thinking journals prior to testing were compared with scores of students who did not. Results indicate that students who wrote thinking journals performed the same as students who did not when tested on problems similar to those practiced in class. Tests in which students transferred their skills to word problems, however, produced significant differences. There was no significant difference between scores when averaged over all four weekly occasions. However, for the final session alone, students who wrote thinking journals scored higher on tests of problem solving transfer than students who did not (p < .01). The study also examined the relationship between the degree of metacognitive thought displayed in students' journal entries, and their measured problem solving ability. Results indicate that students who had higher average reflectivity scores also had higher average problem solving performance and transfer scores (p < .05). It was also noted that the significant relationship between reflectivity and scores of problem solving ability was only observed in male students. It was concluded that under the right conditions, and for the right kinds of problems, thinking journal writing can help students understand their own thinking processes, resulting in improved problem solving behavior. The study also raises the question of whether there are differences between the ways that male and female students apply metacognitive awareness gained through journal writing experiences.
Date: August 1993
Creator: Sullivan, Gary E. (Gary Eugene)
Partner: UNT Libraries

Job-Related Stressors as Perceived by the Directors and Full-Time Faculty of Accredited Educational Programs in Medical Record Administration and Medical Record Technology in the United States and Their Strategies for Coping with Them

Description: The purpose of this study was to: (1) identify the sources of job-related stress which create excessive pressures for the directors and faculty of medical record administration and medical record technology programs; (2) identify the strategies that the directors and faculty of medical record administration and medical record technology programs find most helpful in coping with stress; (3) determine the relationship among demographic variables and job-related stressors as perceived by the directors and faculty of medical record administration and medical record technology programs; and (4) determine the difference among the means of five stress factors as perceived by the directors of medical record administration, faculty of medical record administration, directors of medical record technology and faculty of medical record technology programs. Questionnaires were mailed to 403 respondents. The response rate was 81.3%. Within the limitations of this study, the results revealed that "Having insufficient time to keep abreast of current developments in my field"was the highest stressor. The top stress coping strategy was "Social interaction." The relationship between demographic variables and five stress factors of reward and recognition, time constraint, departmental influence, professional identity and student interaction revealed a positive correlation between degree and professional identity factor, and a negative correlation between degree and student interaction factor. The results also indicated a positive correlation between type of program and the factors-time constraint, professional identity and student interaction; a positive correlation between academic rank and the factors--time constraint and student interaction; a positive correlation between teaching responsibilities and time constraint factor; and a positive correlation between marital status and professional identity factor. The directors and faculty of medical record administration perception of time constraint and professional identity factors differed from that of the directors and faculty of medical record technology programs.
Date: August 1993
Creator: Mozie, David Ikechukwu
Partner: UNT Libraries

Ambiguity of Loss, Anticipatory Grief, and Boundary Ambiguity in Caregiver Spouses and Parents

Description: The purpose of the present cross-sectional study was to examine the effects of ambiguity of loss and type of caregiver-to-patient relationship on anticipatory grief, negative physical and psychological outcomes associated with grief, and boundary ambiguity in family caregivers of chronically ill patients. Questionnaires were completed by 23 parents of ill children and 30 spouses of ill mates. Using an original and a revised concept for level of ambiguity, partial support was found for the prediction that parents and spouses in high ambiguity of loss circumstances would report more anticipatory grief than those in low ambiguity ones. Contrary to prediction, a slight but nonsignificant trend occurred for parents and spouses in low ambiguity situations to report more negative physical and psychological effects associated with grief as well. Level of ambiguity was not found to impact boundary ambiguity as had been hypothesized. Spouses reported more boundary ambiguity than parents, regardless of level of ambiguity of the loss. Contrary to prediction that parents would report less anticipatory grief and more negative physical and psychological outcomes than spouses, generally, no significant differences were found between the two groups. However, using the original concept of ambiguity, parents did tend to recall more past grief than spouses. The study highlighted several methodological concerns which impact research on loss and grief, particularly the difficulty involved in recruiting participants with subsequent occurrence of sampling bias, rudimentary status of available measurement tools, and a host of potentially confounding personal and sociodemographic variables. The present study supports a view of the loss which occurs in families dealing with chronic illness as a complex process whose impact on grief, distress, and family upheaval is influenced by multiple factors. Such factors include both the ambiguity of the loss and the type of family relationship involved. Complex research of a longitudinal nature using ...
Date: August 1993
Creator: Rider, Jan, K. (Jan Kathleen)
Partner: UNT Libraries

Population Policy Implementation and Evaluation in Less Industrialized Countries

Description: This study emphasizes the impact of family planning program components on contraceptive prevalence in less industrialized countries. Building on Lapham and Mauldin's "Program Effort and Fertility Decline" framework and policy evaluation's theory, the author developed two models to examine the impact of family planning programs on contraceptive prevalence and fertility under the constraints of socioeconomic development and demand for family planning. The study employed path analysis and multiple regression on data from the 1982 program effort study in 94 less developed countries (LDCs) by Lapham and Mauldin and 98 LDCs of the 1989 program effort study by Mauldin and Ross. The results of data analyses for all data sets are consistent for the most part. Major findings are as follows: (1) A combination of program effort and socioeconomic development best explains the variation of contraceptive prevalence. (2) Among socioeconomic variables, female literacy exerts the strongest direct and indirect influences to increase contraceptive prevalence and indirect influence to decrease total fertility rate. (3) Christianity performs a significant role in reducing contraceptive prevalence. (4) Among program effort components, availability and accessibility for fertility-control supplies and services have the most influence on contraceptive prevalence. (5) When controlling for demand for family planning, female literacy and Christianity have expected and significant relationships with contraceptive prevalence. Availability and accessibility to fertility-control supplies and services exerts a positive and statistically significant impact on contraceptive prevalence. Demand for family planning has a positive and statistically significant effect on program variables, availability, and contraceptive prevalence. (6) There is a strong inverse relationship between contraceptive use and fertility. Demand for family planning, program effort, and socioeconomic development influence fertility through contraceptive prevalence. The findings of this study suggest that governments in LDCs should give priorities to increasing female education and availability of contraception to effectively reduce fertility.
Date: August 1993
Creator: Sirirangsi, Rangsima
Partner: UNT Libraries

Regulation, Evolution, and Properties of the ato Qperon and its Gene Products in Escherichia coli

Description: The regulation of short chain fatty acid metabolism has been examined. Metabolism of acetoacetate, and short chain fatty acids such as butyrate and valerate, is predicated upon the expression of genes of the ato operon. Acetoacetate induces expression of a CoA transferase (encoded by the atoDA genes) and expression of a thiolase (encoded by the atoB gene). Metabolism of saturated short chain fatty acids requires the activities of the transferase and thiolase and enzymes of 6-oxidation as well. Spontaneous mutant strains were isolated that were either constitutive or that were inducible by valerate or butyrate instead of acetoacetate.
Date: August 1993
Creator: Chen, Chaw-Yuan
Partner: UNT Libraries

Corporate Sale-and-Leaseback Transactions: An Examination of Corporate Incentives, Wealth Effects and Dealer Spreads

Description: There is a limited amount of research dealing with the wealth effects of sale-and-leaseback transactions, but previous research has focused predominantly on the tax effects of these transactions. The results of these studies have often been in conflict with one another. This dissertation shows that tax effects do play a role in determining the wealth effect of sale-and-leasebacks on stockholders, but there exists a framework of finance research that suggests several other factors could play a determining role as well.
Date: August 1993
Creator: Gordon, Bruce L. (Bruce Lee)
Partner: UNT Libraries

The Effects of Parental Divorce and Conflict on Adolescent Separation-Individuation

Description: The influence of parental marital status and parental conflict on the separation-individuation process of college students was investigated in the present study. Past studies have suggested that parental divorce and parental conflict accelerate separation. However, no studies have measured more than one dimension of separation-individuation. In this study the process of separation-individuation was operationalized as involving three dimensions: psychological separation from parents (Psychological Separation Inventory); emotional attachments to parents and peers (Inventory of Parent and Peer Attachment); and the development of an identity (Extended Objective Measure of Ego Identity Status). The sample consisted of 120 male and 120 female undergraduates between the ages of 18 and 22, one-half with parents who were married and one-half with parents who had divorced in the last five years. Subjects completed self-report measures of parental conflict, psychological separation, attachment to parents and to peers, and identity status. Predictions that parental conflict would affect students in intact families differently than their peers with divorced parents were not supported. Instead, parental divorce and conflict were found to have different effects on the components of the separation-individuation process. Subjects reporting higher parental conflict levels described more independent functioning, more negative feelings toward parents, less attachment to parents and to peers, and greater exploration of identity-related issues in comparison to those reporting low levels of conflict. Subjects with parents who had recently divorced reported lower attachment to parents, and greater identity exploration and reluctance to commit to an identity than subjects from intact families. Males reported greater independence from and less attachment to parents, and had committed to an identity without exploration less often than females. Results suggest that parental divorce and conflict may influence adolescent development in different ways. Exploratory analyses suggested that measures of conflict style are more highly related to indices of separation-individuation than measures ...
Date: August 1993
Creator: Marsh, Greg (Gregory Gene)
Partner: UNT Libraries

Language Behaviors and Social Strategies of English as Second Language and English as Primary Language Preschool Children During Computer Assisted Instruction Experiences

Description: This study describes the language behaviors and social strategies of English as Second Language (ESL) and English as Primary Language (EPL) pre-kindergarten students during cooperative Computer Assisted Instruction (CAI) experiences. Thirty-three pre-kindergarten subjects ages four to five years, were videotaped at two personal computers during self-selected center time. The sources of data for this descriptive study were a parent computer survey, videotapes, a subject interview derived from the Young Children's Computer Inventory, and written records.
Date: August 1993
Creator: Emerson, Stacia B. (Stacia Brewster)
Partner: UNT Libraries

The Musical Fallout of Political Activism: Government Investigations of Musicians in the United States, 1930-1960

Description: Government investigations into the motion picture industry are well-documented, as is the widespread blacklisting that was concurrent. Not nearly so well documented are the many investigations of musicians and musical organizations which occurred during this same period. The degree to which various musicians and musical organizations were investigated varied considerably. Some warranted only passing mention, while others were rigorously questioned in formal Congressional hearings. Hanns Eisler was deported as a result of the House Committee on Un-American Activities' (HUAC) investigation into his background and activities in the United States. Leonard Bernstein, Marc Blitzstein, and Aaron Copland are but a few of the prominent composers investigated by the government for their involvement in leftist organizations. The Symphony of the Air was denied visas for a Near East tour after several orchestra members were implicated as Communists. Members of musicians' unions in New York and Los Angeles were called before HUAC hearings because of alleged infiltration by Communists into their ranks. The Metropolitan Music School of New York, led by its president-emeritus, the composer Wallingford Riegger, was the subject of a two day congressional hearing in New York City. There is no way to measure either quantitatively or qualitatively the effect of the period on the music but only the extent to which the activities affected the musicians themselves. The extraordinary paucity of published information about the treatment of the musicians during this period is put into even greater relief when compared to the thorough manner in which the other arts, notably literature and film, have been examined. This work attempts to fill this gap and shed light on a particularly dark chapter in the history of contemporary music.
Date: August 1993
Creator: McCall, Sarah B.
Partner: UNT Libraries