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14
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Engaging Lives: a Nomadic Inquiry Into the Spatial Assemblages and Ethico-aesthetic Practices of Three Makers
This research is a nomadic inquiry into the ethics and aesthetics of three makers’ social and material practices. Deleuze’s concept of the nomad operated in multiple ways throughout the process, which was embedded in performative engagements that produced narratives of becoming. Over four months, I built relationships with three people as I learned about the ethico-aesthetic significance of their daily practices. The process started by interviewing participants in their homes and expanded over time to formal and informal engagements in school, community, and agricultural settings. I used Guattari’s ecosophical approach to consider how subjectivity was produced through spatial assemblages by spending time with participants, discussing material structures and objects, listening to personal histories, and collaboratively developing ideas. Participants included a builder who repurposed a missile base into a private residence and community gathering space, an elementary art teacher who practiced urban homesteading, and a young artist who developed an educational farm. The research considers the affective force of normalized social values, the production of desire by designer capitalism, and the mutation of life from neoliberal policies. Our experiences illuminate the community-building potential of direct encounters and direct exchanges. The project generates ideas for becoming an inquirer in the everyday and …
Date:
May 2014
Creator:
Coats, Cala R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Exploratory Analysis of Social E-health Behavior
Extant literature has documented well that people seek health information via the internet as patients and consumers. Much less, however, is known about interaction and creation behaviors in the development of new online health information and knowledge. More specifically, generalizable sociodemographic data on who engages in this online health behavior via social media is lacking in the sociological literature. The term “social e-health” is introduced to emphasize the difference between seeking behaviors and interaction and creation behaviors. A 2010 dataset of a large nationally representative and randomly sampled telephone survey made freely available from the Pew Research Center is used to examine social e-health behavior according to respondents’ sociodemographics. The dependent variable of social e-health behavior is measured by 13 survey questions from the survey. Gender, race, ethnicity, age, education, and income are used as independent variables. Logistic regression analysis was used to determine the odds of engagement in social e-health behavior based on the sociodemographic predictors. The social determinants of health and digital divide frameworks are used to help explain why socioeconomic variances exist in social e-health behavior. The findings of the current study suggest that predictable sociodemographic patterns along the dimensions of gender, race, age, education, and income …
Date:
May 2014
Creator:
Acadia, Spencer
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Experiences and Perceptions of Students in Music and Mathematics
Since the time of Pythagoras, philosophers, educators, and researchers have theorized that connections exist between music and mathematics. While there is little doubt that engaging in musical or mathematical activities stimulates brain activity at high levels and that increased student involvement fosters a greater learning environment, several questions remain to determine if musical stimulation actually improves mathematic performance. This study took a qualitative approach that allowed 24 high school students to express their direct experiences with music and mathematics, as well as their perceptions of how the two fields are related. Participants were divided into four equal groups based on school music participation and level of mathematic achievement, as determined by their performance on the Texas Assessment of Knowledge and Skills (TAKS). Students participated in a series of three interviews addressing their experiences in both music and mathematics, and took the Multiple Intelligences Developmental Assessment Scales (MIDAS). TAKS data and MIDAS information were triangulated with interview findings. Using a multiple intelligence lens, this study addressed the following questions: (a) How do students perceive themselves as musicians and mathematicians? (b) What experiences do students have in the fields of music and mathematics? (c) Where do students perceive themselves continuing in the …
Date:
May 2014
Creator:
Cranmore, Jeff L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Erich Wolfgang Korngold’s Idea of the “Modern”: Developing Variation in the Piano Concerto in C Sharp, Opus 17
This study examines the Piano Concerto in C sharp, Op.17 (1923), by Erich Wolfgang Korngold (1897-1957), in light of developing variation, techniques that transform motivic ideas and create musical continuity in this work. The troublesome reception history of Korngold’s piano concerto derives from its complex musical features, which have created difficulties in understanding and evaluating this piece. Consequently, critics and scholars often label the highly sophisticated yet tonal musical language in this piece a residue of Romanticism from the nineteenth century. In this document, in contrast, examination of motivic development and connections in Korngold’s piano concerto reveals thematic and structural coherence in light of Korngold’s idea of modernity. This study provides a historical and technical survey of developing variation and discusses Korngold’s implementation of these techniques in his early compositions and the piano concerto. By doing so, this study recognizes the progressive aspect in Korngold’s music.
Date:
May 2014
Creator:
Huang, Shu-Yuan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation
Our country continues to demand clean renewable energy to meet the growing energy needs of our time. Thus, natural gas, which is 87% by volume of methane, has become a hot topic of discussion because it is a clean burning fuel. However, the transportation of methane is not easy because it is a gas at standard temperature and pressure. The usage of transition metals for the conversion of small organic species like methane into a liquid has been a longstanding practice in stoichiometric chemistry. Nonetheless, the current two-step process takes place at a high temperature and pressure for the conversion of methane and steam to methanol via CO + H2 (syngas). The direct oxidation of methane (CH4) into methanol (CH3OH) via homogeneous catalysis is of interest if the system can operate at standard pressure and a temperature less than 250 C. Methane is an inert gas due to the high C-H bond dissociation energy (BDE) of 105 kcal/mol. This dissertation discusses a series of computational investigations of oxy-insertion pathways to understand the essential chemistry behind the functionalization of methane via the use of homogeneous transition metal catalysis. The methane to methanol (MTM) catalytic cycle is made up of two key …
Date:
May 2014
Creator:
Prince, Bruce M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Parental Perceptions of Marketing to Young Children: a Feminist Poststructural Perspective
This study examined parental perceptions of marketing to young children using a feminist post-structural theoretical framework to specifically examine the following questions, 1) To what extent are parents aware of the marketing tactics being directed toward young children? 2) How do power/knowledge relations and practices produce parent’s multiple subjectivities as they parent their children in regards to commercial culture? 3) How can early childhood educators adapt pedagogy and practice in order to meet the needs of children growing up within the context of a commercialized childhood? In-depth unstructured interviews revealed that parents within this study tend to view themselves as solely responsible for their children and do not support governmental regulation of the advertising industry. In most cases, the parents in the study empathized with marketers trying to sell their products to children. Furthermore, while participants in this study were concerned about how consumer culture influences children’s subjectivities, they were more concerned about “adult content” than corporate access to children. Many of the parental perceptions uncovered mirror neoliberal discourses including an emphasis on individual responsibility, the belief that government regulation is censorship and the privileging of economic rationale by systematically representing children as sources of profit. This study utilized Deleuzean …
Date:
May 2014
Creator:
Wolff, Kenya E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
James Macmillan’s St John Passion: the Role of Celtic Folk Idioms and the Reproaches
In 1829, Passion settings entered the secular concert hall with Felix Mendelssohn’s revival of Bach’s St. Matthew Passion in Berlin. The genre has fallen in and out of favor with composers because of the subject matter and Bach’s prominence in the setting. James MacMillan’s St. John Passion has established itself as one of the preeminent modern passion settings by manipulating past idioms such as chant, chorales, and other popular passion conventions in concert with his use of Celtic folk idioms. He creates a passion experience that strives for a spiritually Catholic influence. This approach has earned praise and harsh criticism. MacMillan’s unique use of keening and the drone offers a uniquely Scottish passion that allows for Jesus’ crucifixion to be more poignant to the intended initial audience. In addition to his use of Celtic folk idioms, MacMillan uses added text; most central to this paper is The Reproaches. Movement eight (The Reproaches) is the emotional and musical climax of the work. This inclusion of text has shifted the climax, namely Jesus’s death and burial, to moments before his death. In addition, the value of the work as a liturgical work is lost by the inclusion of these texts, but a …
Date:
May 2014
Creator:
Frank, Nathan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Form and Pianistic Texture in the Operatic Fantasies Based on La Sonnambula and Der Freischütz of Franz Liszt and Julian Fontana: a Comparison of Compositional Approach
This study examines and identifies the differences in compositional approach in the operatic fantasies based on Bellini’s La Sonnambula and Weber’s Der Freischütz by Franz Liszt and Julian Fontana. These four fantasies are placed in the context of musical conventions and audiences in the first half of the nineteenth century. The two operatic fantasies by Liszt that are included in this study are representative of reinterpretations that employ formal and textural features suitable for the concert repertoire of piano virtuosos. In contrast, the fantasies by Fontana are indicative of the potpourri style, and suitable both for amateur performance as well as for pedagogical use. The different functions and purposes of the operatic fantasies of Liszt and Fontana are compared and contrasted, with attention to each composer’s respective intended audiences as well as their distinct compositional intentions.
Date:
May 2014
Creator:
Chung, Migeun
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Impact of Teacher Quality on Reading Achievement of Fourth Grade Students: an Analysis of the 2007, 2009, 2011, and 2013 National Assessment of Educational Progress (Naep)
This study investigated the effects of teacher background variables on fourth grade reading achievement data collected from the 2007, 2009, 2011, and 2013 National Assessment of Educational Progress (NAEP) using a causal-comparative research design. Teacher quality variables related to teacher credentials, instructional methods, training, and support were selected from the NAEP background questionnaire. Descriptive and inferential statistical analyses were used to examine teacher background information and fourth grade reading NAEP scaled scores using measures of central tendency, independent t-tests, analysis of variance, and Tukey’s HSD post hoc analysis. Findings suggest that certain teacher quality variables positively impact fourth grade reading achievement. Significant differences existed among fourth grade reading scaled scores for the following variables: teaching credentials [region (p < .05), traditional preparation route (p < .001), highest degree earned(p < .05), years of experience (p < .001)]; instructional methods [reading aloud by students (p < .01), questioning character motives (p < .01), student selection of reading materials (p < .001), explaining/supporting text (p < .05), identifying main theme (p < .001), time spent on reading (p < .001), primary language arts integration (p < .05)]; teacher support [instructional grade level support/technical assistance by reading specialist (p < .05) and mentoring …
Date:
May 2014
Creator:
Curry, Daphney Leann
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Success Factors of African American Males in Master of Arts Teaching Programs
The problem of not enough African American males enrolling in masters level teaching programs was addressed in this study. This phenomenological study examined the experiences of African American males in master of arts teaching (MAT) programs to understand why they enrolled and what factors led to persistence throughout their program enrollment. Six African American males currently enrolled in MAT programs in the southern, southwestern, and western regions of the United States participated. Data gathered for each participant included an individual, semi-structured interview and a demographic survey. Audio-recordings were used to capture the fullness of the interviews, and transcription software was used to code, analyze, and sort the data to help identify themes. This study looked through the lens of Strayhorn’s graduate student persistence and Albert Bandura’s self-efficacy theories. Factors that influenced African American males to enroll into a program were (a) education as a necessary credential, (b) desire to give back to society, (c) minority scholarship support, (d) making a connection to passion, and (e) desire to enhance teaching skills. External and internal factors were identified as assisting the males to persist within their programs. Academic institutions and policy makers may find the results useful for understanding the unseen educational …
Date:
May 2014
Creator:
Smith, Dantrayl
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Texas Principals’ Data Use: Its Relationship to Leadership Style and Student Achievement
This study applies an empirical research method determine whether Texas public school principals’ leadership styles, coupled with their use of real time data in a data warehouse, influenced their leadership ability as measured by student achievement. In today’s world of data rich environments that require campuses and districts to make data-driven decisions, principals find themselves having to organize and categorize data to help their school boards, campuses, and citizenry make informed decisions. Most school principals in Texas have access to data in multiple forms including national and state resources and a multitude of other data reports. A random sample of principals was selected to take the Multi Factor Leadership Questionnaire (MLQ5x) and the Principals Data Use Survey. The MLQ5x measured principals’ leadership styles as transformational, transactional, or passive avoidant. The Principals Data Use Survey measured how principals use data to inform campus decisions on student achievement, shaping the vision of the campus, and designing professional development. Data obtained from the survey were correlated to determine the relationship between principals’ use of data warehouses and their leadership styles on student achievement as measured by the Texas Assessment of Knowledge and Skills. The results yielded significant relationships between student achievement, principals’ leadership …
Date:
May 2014
Creator:
Bostic, Robert E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Perceptions of Family Vacation and Family Cohesion and the Moderating Effects of Parenting Style
Family cohesion, or emotional bonding, is important to family functioning. Shared activities such as family vacations offer opportunities for strengthening the family unit which can improve cohesion. Additionally, parenting style has direct influence on the family unit and family cohesion. This study’s purpose was to assess to what extent the perception of the family vacation experience predicted the perception of family cohesion and whether that relationship was moderated by parenting style. An online survey was conducted, resulting in 97 adult participants responding to items regarding their last family vacation, family cohesion, and parenting style. Using hierarchical multiple regression, a medium effect size was found for the predictive ability of a participant’s perception of their last family vacation on family cohesion. Findings also indicated a negative correlation between an authoritarian parenting style and perception of family cohesion, but a positive relationship between the interaction of family vacation experience and authoritarian parenting to family cohesion. Stronger predictive abilities were found for those with children in the 3-11 age group. Results may encourage parent and family educators to use family vacation as a tool in assisting families with the processes of building strong and cohesive families.
Date:
May 2014
Creator:
Kruenegel-Farr, Debbie S.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Changing Symbolic Images of the Trumpet: Bologna and Venice in the Seventeenth Century
The trumpet is among the most ancient of all musical instruments, and an examination of its history reveals that it has consistently maintained important and specific symbolic roles in society. Although from its origins this symbolic identity was linked to the instrument’s limited ceremonial and signaling function, the seventeenth century represents a period in which a variety of new roles and identities emerged. Bologna and Venice represent the two most important centers for trumpet writing in Italy during the seventeenth century. Because of the differing ideologies at work in these cities, two distinctive symbolic images of the instrument and two different ways of writing for it emerged. The trumpet’s ecclesiastic role in Bologna and its participation in Venetian opera put the instrument at the service of two societies, one centered around the Church, and another around a more permissive state. Against the backdrop of the social and political structures in Venice and Bologna, and through an examination of its newly-emerging musical roles in each city, the trumpet’s changing identities during a most important point in the history of the instrument will be examined.
Date:
May 2014
Creator:
Karp, Jamie Marie
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Preschool Teachers’ Constructions of Early Reading
Much of the current discourse surrounding the practice of early reading has emerged from policies that dictate the definition and means by which reading is taught and by which reading success is measured. Although this discourse directly influences the work of preschool teachers, little is known about what preschool teachers think about early reading and how they develop these understandings or constructions. Research concerning preschool teachers’ constructions is useful because of the potential influence on teachers' decisions and classroom behaviors. The purpose of this study is to better understand preschool teachers’ constructions concerning early reading and the process of learning to read. Six preschool teachers, with a variety of personal, educational, and professional experiences, from four diverse early childhood programs in the North Texas area were interviewed over a nine-month period during which each participant was interviewed for approximately three hours. Through systematic, inductive analysis, three themes were identified under an overarching theme of the interdependent and relational nature of early reading influences: out-of-school interactions, in-school interactions, and interactions with text. Without exception, these teachers referred to their life experiences as influencing their approach to teaching in general and to teaching reading in particular. The goals these preschool teachers had …
Date:
May 2014
Creator:
Walker, Karen Elledge
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Academic Advising Professional Characteristics and Standards: Do Academic Advisors Follow Recognized Professional Standards in Their Work?
There were two main purposes of this quantitative study. The first purpose was to identify characteristics associated with the selected sample of academic advisors that comprise study. Secondly, the study sought to determine how well work related activities of a selected population of academic advisors correlate with professional characteristics constructs and professional standards constructs of academic advising as a profession. The study used Habley’s (1986) characteristics of a profession to derive the studies professional characteristic construct, education activities, research activities, and professional development activities as it relates to a selected group of academic advisors work related activities. The studies professional standards construct was derived from five Council for the Advancement of Standards (CAS) professional standards for academic as it relates to a selected group of academic advisors work related activities. The study of 78 out of 210 identified full-time academic advisors at two-and four-year public colleges and universities in the North Texas Region utilized a multidimensional researcher-developed Web survey instrument designed to measure professional standards and characteristic within the field of academic advising. Study results reinforced current criticism of research and education activities within the field of academic advising showing that the lack of scholarly research and education activities among …
Date:
May 2014
Creator:
Shelton, Kiesha R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Targeted and Metal-loaded Polymeric Nanoparticles As Potential Cancer Therapeutics
Polymeric nanoparticles were designed, synthesized, and loaded with metal ions to explore the therapeutic potential for transition metals other than platinum found in cisplatin. Nanoparticles were synthesized to show the potential for polymer based vectors. Metal loading and release were characterized via Inductively Coupled Plasma Mass Spectrometry (ICP MS), Energy Dispersive X-Ray Spectroscopy (EDX), X-Ray Photoelectron Spectroscopy (XPS), and Elemental Analysis. Targeting was attempted with the expectation of observed increased particle uptake by cancer cells with flow cytometry and fluorescence microscopy. Results demonstrated that a variety of metals could be loaded to the nano-sized carriers in an aqueous environment, and that the release was pH-dependent. Expected increased targeting was inconsistent. The toxicity of these particles was measured in cancer cells where significant toxicity was observed in vitro via dosing of high copper-loaded nanoparticles and slight toxicity was observed in ruthenium-loaded nanoparticles. No significant toxicity was observed in cells dosed with metal-free nanoparticles. Future research will focus on ruthenium loaded polymeric nanoparticles with different targeting ligands dosed to different cell lines for the aim of increased uptake and decreased cancer cell viability.
Date:
May 2014
Creator:
Harris, Alesha N.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Processing and Characterization of Nickel-Carbon Base Metal Matrix Composites
Carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) are attractive reinforcements for lightweight and high strength metal matrix composites due to their excellent mechanical and physical properties. The present work is an attempt towards investigating the effect of CNT and GNP reinforcements on the mechanical properties of nickel matrix composites. The CNT/Ni (dry milled) nanocomposites exhibiting a tensile yield strength of 350 MPa (about two times that of SPS processed monolithic nickel ~ 160 MPa) and an elongation to failure ~ 30%. In contrast, CNT/Ni (molecular level mixed) exhibited substantially higher tensile yield strength (~ 690 MPa) but limited ductility with an elongation to failure ~ 8%. The Ni-1vol%GNP (dry milled) nanocomposite exhibited the best balance of properties in terms of strength and ductility. The enhancement in the tensile strength (i.e. 370 MPa) and substantial ductility (~40%) of Ni-1vol%GNP nanocomposites was achieved due to the combined effects of grain refinement, homogeneous dispersion of GNPs in the nickel matrix, and well-bonded Ni-GNP interface, which effectively transfers stress across metal-GNP interface during tensile deformation. A second emphasis of this work was on the detailed 3D microstructural characterization of a new class of Ni-Ti-C based metal matrix composites, developed using the laser engineered net …
Date:
May 2014
Creator:
Borkar, Tushar Murlidhar
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Toward a Grounded Theory of Community Networking
This dissertation presents a preliminary grounded theory of community networking based on 63 evaluations of community networking projects funded by the National Telecommunications and Information Administration’s Technology Opportunities Program (TOP) between 1994 and 2007. The substantive grounded theory developed is that TOP projects differed in their contribution to positive outcomes for intended disadvantaged community beneficiaries based on the extent and manner in which they involved the disadvantaged community during four grant process phases: partnership building, project execution, evaluation, and close-out. Positive outcomes for the community were facilitated by using existing communication channels, such as schools, to connect with intended beneficiaries; local financial institutions to provide infrastructure to support local trade; and training to connect community members to jobs. Theoretical contributions include situating outcomes for disadvantaged communities within the context of the grant process; introducing the “vulnerable community” concept; and identifying other concepts and properties that may be useful in further theoretical explorations. Methodological contributions include demonstrating grounded theory as a viable method for exploring large text-based datasets; paving the way for machine learning approaches to analyzing qualitative data; and illustrating how project evaluations can be used in a similar fashion as interview data. Practical contributions include providing information to guide …
Date:
May 2014
Creator:
Masten-Cain, Kathryn
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Forgotten Glory - Us Corps Cavalry in the ETO
The American military experience in the European Theater of Operations during the Second World War is one of the most heavily documented topics in modern historiography. However, within this plethora of scholarship, very little has been written on the contributions of the American corps cavalry to the operational success of the Allied forces. The 13 mechanized cavalry groups deployed by the U.S. Army served in a variety of roles, conducting screens, counter-reconnaissance, as well as a number of other associated security missions for their parent corps and armies. Although unheralded, these groups made substantial and war-altering impacts for the U.S. Army.
Date:
May 2014
Creator:
Nance, William Stuart
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Effects and Mediation of Child-centered Play Therapy on Young Children Who Are Anxious
Anxiety is one of the most pervasive childhood disorders, with a poor prognosis if left untreated. Traditional methods of treating anxiety have been less effective with young children. Based on theoretical assumptions regarding the potential effectiveness of child-centered play therapy (CCPT) as a treatment approach, I sought to explore the effects and mediating factors of CCPT on young children with symptoms of anxiety. Fifty-three participants between the ages of 6 to 8 years old were recruited from four elementary schools, including 36 males and 17 females. Of participants, 11 were African American, 24 were Caucasian, 10 were Hispanic/Latino, one was Asian, and seven were biracial. Twenty-five participants were randomly assigned to an experimental group receiving a mean of 15 sessions of individual CCPT, and 28 participants were assigned to an 8-session active control group. Five factorial analyses of variance (ANOVA) were conducted applying an alpha level of .05 for interpretation of statistical significance and Cohen’s d to assess practical significance. ANOVA results indicated a statistically significant interaction with a large effect size on Total Anxiety score of the Revised Children’s Manifest Anxiety Scale-2nd edition (p = .013, d = .715). Subscale ANOVA results indicated a statistically significant interaction effect with …
Date:
May 2014
Creator:
Stulmaker, Hayley L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Value of Ties: Impact of Director Interlocks on Acquisition Premium and Post-acquisition Performance
Mergers and acquisitions (M&A) evolved as alternative governance structures for firms seeking to combine resources with other firms, access larger markets, or acquire strategic assets. In spite of managers’ enthusiasm about the practice, studies show mixed results regarding post-acquisition performance of acquiring firms. The impact of acquisitions on the performance of acquiring firms has therefore remained inconclusive. A few reasons for this have been suggested and recent meta-analytic research efforts indicate that studies in M&A may have ignored variables that have significant effects on post-acquisition performance. In a bid to extend the literature on M&A and identify cogent variables that impact on acquisition performance, this dissertation draws on social network theory to advance a proposition for the value-of-ties. This was done by examining the impact of directorate interlocks on acquisitions specifically and organizational strategy in general. A non-experimental cross-sectional study of 98 interlocked directorate companies simultaneously involved in acquisitions was conducted. Several multiple regression analyses were conducted and the results obtained suggest that there is a positive linear relationship between director interlocks and post-acquisition performance and that to some extent this relationship is moderated by acquisition experience. The study also showed that director interlocks have a negative linear relationship with …
Date:
May 2014
Creator:
Lawani, Uyi
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Community College Student Success in Developmental Mathematics Courses: a Comparison of Four Instructional Methods
The student success rates for three developmental mathematics courses (prealgebra, elementary algebra, and intermediate algebra) taught through four instructional methods (lecture, personalized system of instruction [PSI], hybrid, and online) were examined. The sample consisted of 9,211 students enrolled in a large Texas community college from fall 2009 through spring 2011. Student success was defined as a grade of C or better. Chi-square tests were used to compare the three developmental mathematics courses success rates. Statistically significant differences in student success were found between all four methods of instruction for all three mathematics courses (prealgebra: χ2 [df = 3] = 107.90, p < 0.001; elementary algebra: χ2 [df = 3] = 88.39, p < 0.001; intermediate algebra χ2 [df = 3] = 254.18, p < 0.001). Binary logistic regression modeling was used to determine to what extent age, gender, ethnicity, residency, Pell eligibility and mode of instruction accounted for the community college students’ course success for each of the three developmental mathematics courses. For prealgebra, the independent variables of gender, race, age, residency, and mode of instruction made statistically significant contributions to the model (χ2 [df = 14, n = 1,743] = 159.196, p < .001; Nagelkerke R2 = .119), with …
Date:
May 2014
Creator:
Keller, Judith
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Increasing the Players: Expanding the Bilateral Relationship of Conflict Management
This research seeks to explore the behavior of international and regional organizations within conflict management. Previous research on conflict management primarily examines UN peacekeeping as the primary actor and lumps all non-UN actors into a single category. I disaggregate this category, examining how international and regional organizations interact when deciding to establish a peace mission, coordinate a peace mission with multiple organizations, and finally, how this interaction affects the success of peace missions. I propose a collective action theoretical framework in which organizations would rather another actor undertake the burden and costs of implementing a peace mission. I find the United Nations is motivated to overcome the collective action problem through an increase in the severity of the conflict. Regional organizations are motivated to establish a peace mission as the economic and political salience of the conflict increases, increasing the possibility of the regional organization acquiring club goods for its member states. The presence of a regional hegemon within a regional organization also significantly increases the likelihood of an organization both establishing a peace mission and taking on the primary role when coordinating a joint mission. I argue this is because a regional hegemon allows the organization to more easily …
Date:
May 2014
Creator:
Stull, Emily A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Fundamental Issues in Support Vector Machines
This dissertation considers certain issues in support vector machines (SVMs), including a description of their construction, aspects of certain exponential kernels used in some SVMs, and a presentation of an algorithm that computes the necessary elements of their operation with proof of convergence. In its first section, this dissertation provides a reasonably complete description of SVMs and their theoretical basis, along with a few motivating examples and counterexamples. This section may be used as an accessible, stand-alone introduction to the subject of SVMs for the advanced undergraduate. Its second section provides a proof of the positive-definiteness of a certain useful function here called E and dened as follows: Let V be a complex inner product space. Let N be a function that maps a vector from V to its norm. Let p be a real number between 0 and 2 inclusive and for any in V , let ( be N() raised to the p-th power. Finally, let a be a positive real number. Then E() is exp(()). Although the result is not new (other proofs are known but involve deep properties of stochastic processes) this proof is accessible to advanced undergraduates with a decent grasp of linear algebra. Its …
Date:
May 2014
Creator:
McWhorter, Samuel P.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library