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The Character of Environmental Citizenship: Virtue Education for Raising Morally Responsible Individuals (open access)

The Character of Environmental Citizenship: Virtue Education for Raising Morally Responsible Individuals

Surely, moral education is not merely intended to result in theoretical knowledge, but instead attempts to change people's behavior. However, when examining and evaluating current trends in moral education, it appears that hitherto moral education has fallen short of its goal to make people better. In this paper, I try to determine what has caused this perceived failure of moral education and conclude that approaches that focus on teaching moral reasoning skills rather than on teaching actual moral content, i.e., values and virtues, are generally ineffective for moral improvement. However, a more traditional form of moral education, namely character education, appears to be a viable alternative to the moral reasoning methods. Since character education can be regarded as the practical application of virtue ethics, I first describe and evaluate virtue ethics and defend it against potential criticisms. I then examine what methods are effective for teaching virtues, and how such methods can potentially be incorporated into the curriculum. Since virtues cannot be taught through theoretical instruction, the acquisition of good habits constitutes the necessary foundation for the establishment of good moral character. Some methods that have been suggested for laying the foundation for virtue are the use of stories, role …
Date: May 2013
Creator: Lindemann, Monica A.
System: The UNT Digital Library
Characterization of Viscoelastic Properties of a Material Used for an Additive Manufacturing Method (open access)

Characterization of Viscoelastic Properties of a Material Used for an Additive Manufacturing Method

Recent development of additive manufacturing technologies has led to lack of information on the base materials being used. A need arises to know the mechanical behaviors of these base materials so that it can be linked with macroscopic mechanical behaviors of 3D network structures manufactured from the 3D printer. The main objectives of my research are to characterize properties of a material for an additive manufacturing method (commonly referred to as 3D printing). Also, to model viscoelastic properties of Procast material that is obtained from 3D printer. For this purpose, a 3D CAD model is made using ProE and 3D printed using Projet HD3500. Series of uniaxial tensile tests, creep tests, and dynamic mechanical analysis are carried out to obtained viscoelastic behavior of Procast. Test data is fitted using various linear and nonlinear viscoelastic models. Validation of model is also carried out using tensile test data and frequency sweep data. Various other mechanical characterization have also been carried out in order to find density, melting temperature, glass transition temperature, and strain rate dependent elastic modulus of Procast material. It can be concluded that melting temperature of Procast material is around 337°C, the elastic modulus is around 0.7-0.8 GPa, and yield …
Date: December 2013
Creator: Iqbal, Shaheer
System: The UNT Digital Library
Churches, Social Service Access and Korean-american Elders: an Exploratory Study (open access)

Churches, Social Service Access and Korean-american Elders: an Exploratory Study

This study examined how Korean co-ethnic churches serve as connections between Korean seniors and the agencies that offer social and health care services. The study developed from a pilot outreach program funded by the North Central Texas Council of Governments’ Area Agency on Aging (NCTAAA) to inform Korean seniors about Medicare-related programs between February and May of 2011. The results of the pilot program suggested that the Korean-American church can be an effective place for program outreach. The dissertation project, working in partnership with the NCTAAA and 2-1-1 services, further explored the use of Korean churches as a vehicle to connect Korean seniors to Extra Help (EH) and Medicare Saving Programs (MSP) and 2-1-1 services, a toll-free number for information about non-emergency health and social services. Fifty-three pastors were contacted to participate in a telephone survey and a face-to-face, in-depth semi-structured interview. Thirty telephone surveys and 11 face-to-face interviews were conducted. Five of the 30 pastors agreed to host program outreach presentations for the EH, MSP, and 2-1-1 services in their churches. Host churches tended to be more likely highly structured, regularly scheduled programs (e.g., Senior College) for seniors already in place. A total of 405 Korean seniors participated in …
Date: December 2013
Creator: Kim, Eunkyung
System: The UNT Digital Library
Classless: on Being Middle Class in America (open access)

Classless: on Being Middle Class in America

Classless: On Being Middle Class in America is a documentary film that explores what it means to be middle class in America. The film combines personal narrative, folksy reporting, and comedy as the film's director— Joe Brown, tries to reconcile his own status anxiety with everyday understandings of social class. Classless takes the form of a journey; the film travels through the American South, Northeast, and the Mountain West while trying to get at the heart of our middle class American Dream. Classless forwards three main arguments: (1) the American middle class is not as all-encompassing as seems; (2) Americans are more concerned about inequality than both politicians and the media suggest; and (3) many Americans are not actually middle class, economically speaking.
Date: May 2013
Creator: Brown, Joseph V.
System: The UNT Digital Library
Cold-formed Steel Framed Shear Wall Sheathed with Corrugated Sheet Steel (open access)

Cold-formed Steel Framed Shear Wall Sheathed with Corrugated Sheet Steel

Incombustibility is one important advantage of the sheet steel sheathed shear wall over wood panel sheathed shear wall. Compared to shear wall sheathed with plywood and OSB panel, shear wall sheathed with flat sheet steel behaved lower shear strength. Although shear wall sheathed with corrugated sheet steel exhibited high nominal strength and high stiffness, the shear wall usually behaved lower ductility resulting from brittle failure at the connection between the sheathing to frames. This research is aimed at developing modifications on the corrugated sheathing to improve the ductility of the shear wall as well as derive practical response modification factor by establishing correct relationship between ductility factor ? and response modification factor R. Totally 21 monotonic and cyclic full-scale shear wall tests were conducted during the winter break in 2012 by the author in NUCONSTEEL Materials Testing Laboratory in the University of North Texas. The research investigated nineteen 8 ft. × 4 ft. shear walls with 68 mil frames and 27 mil corrugation sheet steel in 11 configurations and two more shear walls sheathed with 6/17-in.OSB and 15/32-in. plywood respectively for comparison. The shear walls, which were in some special cutting arrangement patterns, performed better under lateral load conditions according …
Date: May 2013
Creator: Yu, Guowang
System: The UNT Digital Library
Community Resilience in Thailand: a Case Study of Flood Response in Nakhonsawan City Municipality (open access)

Community Resilience in Thailand: a Case Study of Flood Response in Nakhonsawan City Municipality

Natural disasters such as flooding often affect vast areas and create infinite demands that need to be addressed in the same time. The wide scopes and severe impacts of such catastrophes often exceed, if not overwhelm, capacity of the national government to handle. In such a situation, communities such as cities and neighborhoods need to rely on their own capacity (resources, strategies, and expertise) to respond to disaster impacts at least until external assistance can be reached. Thus, studying how communities can be resilient to the impacts of natural disasters is important because this would enhance their ability to respond to the next disaster better. Within the context of great flooding in Thailand in 2011, this dissertation investigated the factors that generated or enhanced resilience of flood stricken-communities in Thailand. Nakhonswan City Municipality was selected as the research site. Qualitative research methods were employed in this study. Data were collected using in-depth interview and focus group. Thirty-six participants (28 for in-depth interview and 8 for focus group interview) from various organizations were recruited using snowball and purposive sampling strategies. Interview data from the field research were transcribed, translated from Thai language to English, and then analyzed using open coding and …
Date: May 2013
Creator: Khunwishit, Somporn
System: The UNT Digital Library
Comparative Phyto-uptake Across Distribution Coefficients of Pharmaceutical Compounds and Aquatic Macrophytes: Carbamazepine and Amiodarone Uptake in Lemna Spp (open access)

Comparative Phyto-uptake Across Distribution Coefficients of Pharmaceutical Compounds and Aquatic Macrophytes: Carbamazepine and Amiodarone Uptake in Lemna Spp

Few studies have been conducted on the effectiveness of phytoremediation of pharmaceutical compounds, although the persistent and non-acutely toxic nature of many of these compounds in today's water bodies may yield an ideal application for this practice. To quantify the potential effectiveness of plant uptake, kinetic and proportional bioconcentration factors (BCFk, and BCFp, respectively) in nanograms (ng) carbamazepine and amiodarone per gram (g) wet weight plant tissue for Lemna spp. were determined utilizing a 14-day continuous flow-through study. Samples were analyzed using isotope dilution liquid chromatography-tandem mass spectrometry (ID-LC-MS/MS) running in positive ion mode. Kinetic BCF was estimated at 0.538, while proportional BCF was estimated at 0.485. Kinetic BCF for the amiodarone study was estimated at 23.033, whereas proportional BCF was estimated at 41.340. Possible contamination of the C18 column and peristaltic pump failure may have impacted uptake results. In light of variability and current lack of research in the field, this work should be considered exploratory rather than conclusive.
Date: August 2013
Creator: Woodard, Jennifer Kristin
System: The UNT Digital Library
A Comparative Study of Non Linear Conjugate Gradient Methods (open access)

A Comparative Study of Non Linear Conjugate Gradient Methods

We study the development of nonlinear conjugate gradient methods, Fletcher Reeves (FR) and Polak Ribiere (PR). FR extends the linear conjugate gradient method to nonlinear functions by incorporating two changes, for the step length αk a line search is performed and replacing the residual, rk (rk=b-Axk) by the gradient of the nonlinear objective function. The PR method is equivalent to FR method for exact line searches and when the underlying quadratic function is strongly convex. The PR method is basically a variant of FR and primarily differs from it in the choice of the parameter βk. On applying the nonlinear Rosenbrock function to the MATLAB code for the FR and the PR algorithms we observe that the performance of PR method (k=29) is far better than the FR method (k=42). But, we observe that when the MATLAB codes are applied to general nonlinear functions, specifically functions whose minimum is a large negative number not close to zero and the iterates too are large values far off from zero the PR algorithm does not perform well. This problem with the PR method persists even if we run the PR algorithm for more iterations or with an initial guess closer to the …
Date: August 2013
Creator: Pathak, Subrat
System: The UNT Digital Library
A Comparative Study of the Effects of State Grant Reductions on Local Expenditures: Empirical Studies in Massachusetts and Colorado Municipalities (open access)

A Comparative Study of the Effects of State Grant Reductions on Local Expenditures: Empirical Studies in Massachusetts and Colorado Municipalities

State grants are perceived to mitigate the fiscal disparities among local governments in providing services. However, cutbacks in state grants as a result of changes in state grant policy in different states affect local expenditures dedicated to maintaining service provisions to citizens. This dissertation constructs a theoretical model to explain the extent to which and the ways in which types of state grants, revenue diversity, and form of local government impact local spending and the provision of public programs when local governments experience cuts in state grants. The dissertation also argues that when facing state grant cuts, local governments with a council-manager form of government and with higher revenue diversity will experience reduced change in local expenditures and that decreases in state categorical grants will lead to more cuts in distributive program expenditures. Given the diversity of state and local arrangements, this dissertation conducts a comparative and panel data study to test the hypotheses in 351 and 271 municipalities in Massachusetts and Colorado, respectively, in 2000 through 2008. The empirical results indicate that the form of government and the degree of revenue diversification have a greater impact on the local spending behaviors in Colorado than in Massachusetts. Meanwhile, decreases in …
Date: May 2013
Creator: Chaicharoen, Siwaporn
System: The UNT Digital Library
Comparison of Learning Performance Between Students Who Do and Students Who Do Not Use Mobile Technology-based Activities (open access)

Comparison of Learning Performance Between Students Who Do and Students Who Do Not Use Mobile Technology-based Activities

This study examined if using mobile technology-based activities would increase student performance in biological science courses. The study compared two groups of students in lectures and labs. Each group had about 20 students. The mobile group had mobile technology-based activities and the non-mobile group received conventional instruction. The mobile group used links to the website, or a QR Code to access the activities. The non-mobile group had handouts and worksheets over the same content. The research methodology for this study was mixed method. The study was a quasi-experimental design that used instruction method as the independent variable between two groups. The study used formative and summative assessment to compare the performance of the mobile group and non-mobile group in lecture and lab. The student in the mobile group had statistically significantly higher lab exam scores than students in the non-mobile group. Additionally, Students were surveyed about their performance expectancy and effort expectancy using mobile technology for learning, and they were asked about their self-management of learning. Analysis indicated that both groups had similar performance and effort expectancy using mobile technology for learning, but the two groups differed on self-management of learning responses to the survey. Focus groups from the mobile …
Date: August 2013
Creator: Stowe, William A., Jr.
System: The UNT Digital Library
A Comparison of Picture to Word Training and Word to Word Training on Native English Speaking College Students’ Acquisition of Italian Vocabulary (open access)

A Comparison of Picture to Word Training and Word to Word Training on Native English Speaking College Students’ Acquisition of Italian Vocabulary

The current study assessed the effects of two teaching stimulus presentations, i.e. picture to word and word to word, used to teach second language vocabulary to college students. It also evaluated the emergence of untaught relations when picture to word and word to word were used separately as a teaching strategy. The findings showed picture to word training resulted in more untaught relations. Several aspects such time allotted for online quizzes, experimental and teaching arrangements and vocabulary complexity were suggested for future research.
Date: December 2013
Creator: Vo, Phuong Vi
System: The UNT Digital Library
A Comparison of Three Teacher Evaluation Methods and the Impact on College Readiness (open access)

A Comparison of Three Teacher Evaluation Methods and the Impact on College Readiness

Much attention in recent years has gone to the evaluation of teacher effectiveness, and some scholars have developed conceptual models to evaluate the effectiveness. The purpose of this study was to compare three teacher evaluation models – the Texas Professional Development Appraisal System (PDAS), the teacher index model (TI), and the value-added model (VAM) – to determine teacher effectiveness using student demographic and longitudinal academic data. Predictive data from students included economic disadvantage status, ethnicity, gender, participation in special education, limited English proficiency, and performance on Texas Assessment of Knowledge and Skills (TAKS). Data serving as dependent variables were scores from Scholastic Aptitude Test (SAT®) verbal/critical reasoning and mathematics. These data came from 1,714 students who were 9.7% Hispanic, 9.2% African American, and 81.2% White. The models were tested for 64 English language arts teachers and 109 mathematics teachers, using student examination scores from the SAT® verbal/critical reasoning and mathematics. The data were aligned for specific faculty members and the students whom they taught during the year of the study. The results of the study indicated that the TI and VAM explained approximately 42% of the variance in college entrance exam scores from the SAT® verbal/critical reasoning and mathematics (R2 …
Date: December 2013
Creator: Smalskas, Tamy L.
System: The UNT Digital Library
A Comprehensive Modeling Framework for Airborne Mobility (open access)

A Comprehensive Modeling Framework for Airborne Mobility

Mobility models serve as the foundation for evaluating and designing airborne networks. Due to the significant impact of mobility models on the network performance, mobility models for airborne networks (ANs) must realistically capture the attributes of ANs. In this paper, I develop a comprehensive modeling framework for ANs. The work I have done is concluded as the following three parts. First, I perform a comprehensive and comparative analysis of AN mobility models and evaluate the models based on several metrics: 1) networking performance, 2) ability to capture the mobility attributes of ANs, 3) randomness levels and 4) associated applications. Second, I develop two 3D mobility models and realistic boundary models. The mobility models follow physical laws behind aircraft maneuvering and therefore capture the characteristics of aircraft trajectories. Third, I suggest an estimation procedure to extract parameters in one of the models that I developed from real flight test data. The good match between the estimated trajectories and real flight trajectories also validate the suitability of the model. The mobility models and the estimation procedure lead to the creation of “realistic” simulation and evaluation environment for airborne networks.
Date: December 2013
Creator: Xie, Junfei
System: The UNT Digital Library
Computational Studies of Inorganic Systems with a Multiscale Modeling Approach: From Atomistic to Continuum Scale (open access)

Computational Studies of Inorganic Systems with a Multiscale Modeling Approach: From Atomistic to Continuum Scale

Multiscale modeling is an effective tool for integrating different computational methods, creating a way of modeling diverse chemical and physical phenomena. Presented are studies on a variety of chemical problems at different computational scales and also the combination of different computational methods to study a single phenomenon. The methods used encompass density functional theory (DFT), molecular dynamics (MD) simulations and finite element analysis (FEA). The DFT studies were conducted both on the molecular level and using plane-wave methods. The particular topics studied using DFT are the rational catalyst design of complexes for C—H bond activation, oxidation of nickel surfaces and the calculation of interaction properties of carbon dioxide containing systems directed towards carbon dioxide sequestration studies. Second and third row (typically precious metals) transition metal complexes are known to possess certain electronic features that define their structure and reactivity, and which are usually not observed in their first-row (base metal) congeners. Can these electronic features be conferred onto first-row transition metals with the aid of non-innocent and/or very high-field ligands? Using DFT, the impact of these electronic features upon methane C—H bond activation was modeled using the dipyridylazaallyl (smif) supporting ligand for late, first-row transition metal (M) imide, oxo and …
Date: August 2013
Creator: Olatunji-Ojo, Olayinka A.
System: The UNT Digital Library
Confirming the Constructs of the Adlerian Personality Priority Assessment (Appa) (open access)

Confirming the Constructs of the Adlerian Personality Priority Assessment (Appa)

The primary purpose of this study was to confirm the four-factor structure of the 30-item Adlerian Personality Priority Assessment (APPA) using a split-sample cross-validation confirmatory factor analysis (CFA). The APPA is an assessment, grounded in Adlerian theory, used to conceptualize clients based on the four personality priorities most commonly used in the Adlerian literature: superiority, pleasing, control, and comfort. The secondary purpose of this study was to provide evidence for discriminant validity, examine predictive qualities of demographics, and explore the prevalence of the four priorities across demographics. For the cross validation CFA, I randomly divided the sample, 1210 undergraduates, at a large public research university (53% Caucasian, 13.1% Hispanic/Latino(a), 21.4% African American, 5.4% American Indian, and 5.8% biracial; mean age =19.8; 58.9% females), into two equal subsamples. I used Subsample 1 (n = 605) to conduct the initial CFA. I held out Subsample 2 (n = 605) to test any possible model changes resulting from Subsample 1 results and to provide further confirmation of the APPA's construct validity. Findings from the split-sample cross-validation CFA confirmed the four-factor structure of the APPA and provided support for the factorial/structure validity of the APPA's scores. Results also present initial evidence of discriminant validity …
Date: August 2013
Creator: Dillman Taylor, Dalena
System: The UNT Digital Library
Confirming the Constructs of the Child Interpersonal Relationship and Attitudes Assessment (open access)

Confirming the Constructs of the Child Interpersonal Relationship and Attitudes Assessment

The purpose of this study was to confirm the four-factor model of the Child Interpersonal Relationship and Attitudes Assessment (CIRAA) in order to establish the instrument’s factor/structure validity using a sample different than that used in instrument development. The CIRAA was the first parent-report instrument based on child-centered theory and designed to measure play therapy outcomes. Its four factors are Self-Regulation (formerly Self-Control), Interpersonal Relationships, Coping Skills, and Internal Locus of Evaluation. For this study, the CIRAA was administered to 206 parents; their children were 75 females and 131 males aged 3 to 10 years old. The distributions of children’s genders and ages in this study were similar to the distributions of the sample used to develop the CIRAA. Based on confirmatory factor analysis results of overall goodness-of-fit indices; localized areas of strain; and interpretability, size, and statistical significance (p < .001) of the model's parameter estimate, the four-factor model of the CIRAA was confirmed with both theoretical and empirical support. Internal consistency reliability for the subscales and total score were acceptable, with an overall reliability coefficient of .928. A medium negative correlation (r = -.417, n = 47, p < .01) was found between the CIRAA total scores and …
Date: August 2013
Creator: Chung, Chiao-Feng
System: The UNT Digital Library
Congruence, Unconditional Positive Regard, and Empathic Understanding in Child-centered Play Therapy (open access)

Congruence, Unconditional Positive Regard, and Empathic Understanding in Child-centered Play Therapy

The purpose of this study was to explore how the therapist-provided conditions of congruence, unconditional positive regard, and empathic understanding were experienced and conveyed in child-centered play therapy (CCPT). Although the therapist-provided conditions are considered essential to the therapeutic process in CCPT, a gap exists between child-centered theory and empirical exploration of the process and dynamics of these relational variables in CCPT. Due to the limited research in this area, a grounded theory approach was utilized to explore how the three variables emerge in CCPT. Participants included four advanced doctoral students, all Caucasian females with extensive training in CCPT, and 12 children ranging from 4 to 8 years of age receiving weekly, individual CCPT. One individual CCPT session was observed and video-recorded for each therapist-child dyad (n = 12). Following each observation, play therapists were interviewed regarding the observed play session (n = 12). During each interview, the researcher and therapist watched the recorded play session in its entirety and discussed noteworthy interactions between the child and therapist. The video-recorded play therapy sessions and therapist interviews were analyzed using a multiphasic, constant comparative method. Results of the analysis included a process-model of the therapist-provided conditions in CCPT, examples of play …
Date: August 2013
Creator: Jayne, Kimberly M.
System: The UNT Digital Library
Connecting the Circuit:  Analyzing Jurors' Cognitive Gaps and Damage Awards in Patent Infringement Trials (open access)

Connecting the Circuit: Analyzing Jurors' Cognitive Gaps and Damage Awards in Patent Infringement Trials

Patent litigation is notorious for the technicality of evidence and the rhetoric of experts. Citizens selected to serve on the jury have no specialized training and have rarely been exposed to the technology or the patent process. This study provides insight into the field of jury decision-making in complex patent cases by analyzing the cognitive gaps and the tactics used by jurors to minimize them. Additionally, the study examines the justifications for the damage awards jurors provide. This analysis focused on jurors engaged in mock trial patent deliberations. The story model and sensemaking theory serve as the theoretical framework of this research and provide a structure for support and a lens for analysis. The results indicate that jurors rely on three distinct and dichotomous topologies when navigating cognitive gaps. Searching for answers either individually or as a group, relying on lists or stories, and turning to facts or emotions, jurors navigate through their uncertainty. Through the line-by-line analysis of mock jury transcriptions, three continuums regarding damage justifications emerged. Jury members found themselves navigating uncertainty versus certainty, rationality versus irrationality, and facts versus emotions. The theoretical implications broaden the story model to include cognitive gaps in all phases and increase the …
Date: May 2013
Creator: Drescher, L. Hailey
System: The UNT Digital Library
Consistency, Consolidation, and Cognition in Autobiographical Memories: a Flashbulb Memory Approach (open access)

Consistency, Consolidation, and Cognition in Autobiographical Memories: a Flashbulb Memory Approach

Flashbulb memories are highly vivid and long-lasting memories for events that are emotionally significant and personally important. These memories are held in very high confidence in accuracy over an extended period. In particular, individuals believe that they can remember the personal details surrounding the event such as where they were and what they were doing at the time the event occurred. Evidence from research, however, indicates that this may not be the case. The study of flashbulb memories has typically been confined to negative events such as September 11, 2001. In the current study, we employ the methods of Talarico and Rubin (2003) to investigate flashbulb memory formation to a positive event. The event is the assassination of Osama bin Laden, which resonated as a highly positive event for many Americans evidenced by the thousands of people flooding the streets of Washington, D.C. and New York City to celebrate. We examined various memory properties over a one-year period, including vividness, rehearsal, belief in accuracy, and consistency. Results confirm the formation of flashbulb memories to the assassination event, but results did not support many of the proposed hypotheses. Some differences were found for different testing groups (i.e., immediate versus one week …
Date: May 2013
Creator: Kraha, Amanda
System: The UNT Digital Library
Contribution of Hurricane Ike Storm Surge Sedimentation to Long-term Aggradation of Coastal Marshes in Southeastern Texas and Southwestern Louisiana (open access)

Contribution of Hurricane Ike Storm Surge Sedimentation to Long-term Aggradation of Coastal Marshes in Southeastern Texas and Southwestern Louisiana

Coastal marshes and wetlands are vital natural resources that offer habitats for plants and animals, serve as ecological filtration for soil and water pollutants, and act as protection for coastlines. Fishing, both commercial and sport, has a large economic impact in the study area – the Gulf Coast between Galveston Bay, TX and Oak Grove, LA. The objective of this research was to determine the contribution of Hurricane Ike storm surge sedimentation to long-term marsh aggradation in Texas and Louisiana coastal marshes. The research hypothesized that Hurricane Ike’s storm surge deposit would be equal to decades and possibly even a century’s worth of the average annual non-storm sedimentation. A quantitative field study was performed. The storm surge deposit was examined in a series of 15 transects covering approximately 180 km east of Hurricane Ike’s landfall. Nine of the 15 transects were re-surveyed a year after the initial measurement to assess preservation of the deposit. The results demonstrate that Hurricane Ike contributed between 10 to 135 years’ worth of sediment to coastal marshes along the coasts of Texas and Louisiana, and the sediment deposits have been preserved for over two years.
Date: August 2013
Creator: Denlinger, Emily E.
System: The UNT Digital Library
Convergent Validity of Variables Residualized By a Single Covariate: the Role of Correlated Error in Populations and Samples (open access)

Convergent Validity of Variables Residualized By a Single Covariate: the Role of Correlated Error in Populations and Samples

This study examined the bias and precision of four residualized variable validity estimates (C0, C1, C2, C3) across a number of study conditions. Validity estimates that considered measurement error, correlations among error scores, and correlations between error scores and true scores (C3) performed the best, yielding no estimates that were practically significantly different than their respective population parameters, across study conditions. Validity estimates that considered measurement error and correlations among error scores (C2) did a good job in yielding unbiased, valid, and precise results. Only in a select number of study conditions were C2 estimates unable to be computed or produced results that had sufficient variance to affect interpretation of results. Validity estimates based on observed scores (C0) fared well in producing valid, precise, and unbiased results. Validity estimates based on observed scores that were only corrected for measurement error (C1) performed the worst. Not only did they not reliably produce estimates even when the level of modeled correlated error was low, C1 produced values higher than the theoretical limit of 1.0 across a number of study conditions. Estimates based on C1 also produced the greatest number of conditions that were practically significantly different than their population parameters.
Date: May 2013
Creator: Nimon, Kim
System: The UNT Digital Library
Cooperation-induced Criticality in Neural Networks (open access)

Cooperation-induced Criticality in Neural Networks

The human brain is considered to be the most complex and powerful information-processing device in the known universe. The fundamental concepts behind the physics of complex systems motivate scientists to investigate the human brain as a collective property emerging from the interaction of thousand agents. In this dissertation, I investigate the emergence of cooperation-induced properties in a system of interacting units. I demonstrate that the neural network of my research generates a series of properties such as avalanche distribution in size and duration coinciding with the experimental results on neural networks both in vivo and in vitro. Focusing attention on temporal complexity and fractal index of the system, I discuss how to define an order parameter and phase transition. Criticality is assumed to correspond to the emergence of temporal complexity, interpreted as a manifestation of non-Poisson renewal dynamics. In addition, I study the transmission of information between two networks to confirm the criticality and discuss how the network topology changes over time in the light of Hebbian learning.
Date: August 2013
Creator: Zare, Marzieh
System: The UNT Digital Library
Correlates Between Adult Romantic Attachment Patterns and Dimensional Personality Pathology (open access)

Correlates Between Adult Romantic Attachment Patterns and Dimensional Personality Pathology

Previous research has suggested that adult attachment disturbance is related to maladaptic interaction patterns and personality disorder constructs. Specifically, research indicates that those with attachment disturbance are significantly more likely to meet criteria for a number of personality disorders, including borderline personality disorder, narcissistic personality disorder, and antisocial personality disorder. The purpose of this study was to investigate the associations between adult attachment and the new dimensional model of personality disorders scheduled to be released in the Diagnostic and Statistical Manual for Mental Health Diosrders (5th ed.) in spring 2013. Participants completed the Schedule for Adaptive and Nonadaptive Personality (SNAP) to measure dimensional personality functioning and the Experiences in Close Relationships (ECR-R) and the Attachment Prototypes to measure adult attachment patterns. Additionally, select scales from the Personality Assessment Inventory (PAI) and the Five Factor Model (FFM) will be utilized as secondary measures of personality patterns. The results suggest strong associations between adult attachment orientations and specific maladaptive personality characteristics.
Date: August 2013
Creator: Ernest, Kimberly Dawn
System: The UNT Digital Library
Correlates of Depression in Elderly Asians in the United States (open access)

Correlates of Depression in Elderly Asians in the United States

The primary purpose of this study was to examine the correlation between depression and the personal characteristics of Asians who are 50 years or older. The secondary objective was to determine whether Asians 50 years or older living in the United States are more likely to be depressed than other ethnicities. The information for this study was secured from the National Health Interview Survey, spanning the years 2001 to 2010. In this study, I utilized the SAS-Callable SUDAAN statistical system. Multivariate regression was used to predict and determine significant correlations. The results indicated that Asians 50 and older living in the U.S. and who experience functional limitations, poor vision, hypertension, poor health, not married, and unemployed in previous year were in general more prone to depression. Furthermore, the study indicated that Asian elderly living the U.S. showed lower rates of depression than all non- Asian ethnicities. However when controlled for personal characteristics only Whites and Hispanics had higher depression incidences than Asian elderly. Recommendations for future studies include: conducting more micro and macro studies of Asian elders, such as in-depth case studies for each ethnicity, longitudinal studies of various Asian subgroups, and studies of Asian elderly with hypertension who have …
Date: December 2013
Creator: Kung, Kevin Hsiang-Hsing
System: The UNT Digital Library