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2017

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Robust Measures Of Variable Importance For Multivariate Group Designs, Tolulope T. Sajobi, Lisa M. Lix Dec 2017

Robust Measures Of Variable Importance For Multivariate Group Designs, Tolulope T. Sajobi, Lisa M. Lix

Journal of Modern Applied Statistical Methods

Variable importance measures based on discriminant analysis and multivariate analysis of variance are useful for identifying variables that discriminate between two groups in multivariate group designs. Variable importance measures are developed based on trimmed and Winsorized estimators for describing group differences in multivariate non-normal populations.

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Missing Data In Longitudinal Surveys: A Comparison Of Performance Of Modern Techniques, Paola Zaninotto, Amanda Sacker Dec 2017

Missing Data In Longitudinal Surveys: A Comparison Of Performance Of Modern Techniques, Paola Zaninotto, Amanda Sacker

Journal of Modern Applied Statistical Methods

Using a simulation study, the performance of complete case analysis, full information maximum likelihood, multivariate normal imputation, multiple imputation by chained equations and two-fold fully conditional specification to handle missing data were compared in longitudinal surveys with continuous and binary outcomes, missing covariates, and an interaction term.

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The Impact Of Inappropriate Modeling Of Cross-Classified Data Structures On Random-Slope Models, Feifei Ye, Laura Daniel Dec 2017

The Impact Of Inappropriate Modeling Of Cross-Classified Data Structures On Random-Slope Models, Feifei Ye, Laura Daniel

Journal of Modern Applied Statistical Methods

Previous studies that explored the impact of misspecification of cross-classified data structure as strictly hierarchical are limited to random intercept models. This study examined the effects of misspecification of a two-level, cross-classified, random effect model (CCREM) where both the level-1 intercept and slope were allowed to vary randomly. Results suggest that ignoring one of the crossed factors produced considerably underestimated standard errors for: 1) the regression coefficients of the level-1 predictor; 2) the inappropriately modeled predictor associated with the misspecified crossed factor; and 3) and their interaction. This misspecification also resulted in a significant inflation of the level-1 residual variances …

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Buspirone Maintenance Does Not Alter The Reinforcing, Subjective, And Cardiovascular Effects Of Intranasal Methamphetamine, Anna R. Reynolds, Justin Charles Strickland, William W. Stoops, Joshua A. Lile, Craig R. Rush Dec 2017

Buspirone Maintenance Does Not Alter The Reinforcing, Subjective, And Cardiovascular Effects Of Intranasal Methamphetamine, Anna R. Reynolds, Justin Charles Strickland, William W. Stoops, Joshua A. Lile, Craig R. Rush

Pharmaceutical Sciences Faculty Publications

Background—Medications development efforts for methamphetamine-use disorder have targeted central monoamines because these systems are directly involved in the effects of methamphetamine. Buspirone is a dopamine autoreceptor and D3 receptor antagonist and partial agonist at serotonin 1A receptors, making it a logical candidate medication for methamphetamine-use disorder. Buspirone effects on abuse-related behaviors of methamphetamine have been mixed in clinical and preclinical studies. Experimental research using maintenance dosing, which models therapeutic use, is limited. This study evaluated the influence of buspirone maintenance on the reinforcing effects of methamphetamine using a self-administration procedure, which has predictive validity for clinical efficacy. The impact …

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Relative Importance Of Different Body Channels To The Believability Of A Stylized 3d Character Animation In A Full Body Shot, Saikiran Anasingaraju Dec 2017

Relative Importance Of Different Body Channels To The Believability Of A Stylized 3d Character Animation In A Full Body Shot, Saikiran Anasingaraju

Open Access Theses

Character animation involves movement in different channels of the character’s body. There is a norm in the animation industry that each of these different body channels has varying contributions to the believability of an acting performance: body movement being the highest contributor and lip sync the lowest. This thesis investigated this norm using statistical analysis. While the reduction of body motion caused the biggest drop in believability, similar reductions in facial animation and lip sync have not made a significant effect on the believability. The only exception to the above statement is the animation depicting the emotion sadness, where no …

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Development Of A Five-Factor Model Measure Of Machiavellianism., Katherine L. Collison Dec 2017

Development Of A Five-Factor Model Measure Of Machiavellianism., Katherine L. Collison

Open Access Theses

Machiavellianism is characterized by planfulness, the ability to delay gratification, interpersonal antagonism, and callousness. Although its theoretically positive relation with facets of conscientiousness should make Machiavellianism distinct from psychopathy, current measurements of Machiavellianism are indistinguishable from those of psychopathy. The goal of the present study was to create a theoretically grounded measure of Machiavellianism using an expert-derived trait profile based on the thirty facets of the Five Factor Model (FFM) and then test the validity of that measure by comparing it to relevant constructs. Expert ratings of the prototypical Machiavellian on FFM facets yielded a profile of 13 facets spanning …

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Facilitating Willingness To Communicate (Wtc): Communication For Academic And Social Life (Casl), Sarah Elizabeth Fehrman Dec 2017

Facilitating Willingness To Communicate (Wtc): Communication For Academic And Social Life (Casl), Sarah Elizabeth Fehrman

Open Access Theses

Much has been written about learner Willingness to Communicate (WTC) in a second language. Multiple factors, including anxiety, motivation, personality, and context, have been identified as contributing to language learners’ willingness (or lack thereof) to attempt to communicate in a second language. Current research has identified these factors, yet there has been very little work done on how to facilitate WTC in learners or provide instructors with specific strategies and tools to utilize in the classroom. This thesis will undertake a historical overview of the development of WTC theory, examine the main antecedents to WTC, and finally examine current research …

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A Systematic Literature Review To Identify Best Practices For Communication In Virtual Teams, Arielle Mabon Dec 2017

A Systematic Literature Review To Identify Best Practices For Communication In Virtual Teams, Arielle Mabon

Open Access Theses

Virtual teams are necessary for organizations to remain competitive in today’s global society, but the complexities of virtual team environments impart strain on virtual teams to perform key team activities. Although virtual teams are expected to deliver complex projects, training for communicating in virtual teams is often overlooked. This thesis was conducted using a systematic literature review of peer-reviewed articles from 2012-2017 to identify elements of communication that contributed to virtual team effectiveness and communication best practices that may be perceived as prescriptive content for virtual team communication training. The results of this study suggest that virtual team communication training …

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An Examination Of The Relationship Between Fitts' Law And Schmidt's Law, Jonathan Mckeeman Dec 2017

An Examination Of The Relationship Between Fitts' Law And Schmidt's Law, Jonathan Mckeeman

Open Access Theses

There are two prominent speed accuracy tradeoff relationships; Fitts’ Law and Schmidt’s Law. The Fitts tasks are considered to be spatially constrained, whereas the Schmidt tasks are temporally constrained. In this experiment the relationship between these two speed accuracy tradeoffs was examined. Previous studies have allowed for the hypothesis that these two laws may be related or share similar control processes. Through analysis of the previous literature on the subject I hypothesized that the two speed accuracy tradeoffs are unrelated and do not share a common control process. To test this hypothesis, participants performed both speed accuracy tradeoff tasks under …

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Effect Of A Brand Story Structure On Perceived Brand Image: The Mediating Role Of Immersion In A Brand Story Of A Luxury Hotel, Kyungin Ryu Dec 2017

Effect Of A Brand Story Structure On Perceived Brand Image: The Mediating Role Of Immersion In A Brand Story Of A Luxury Hotel, Kyungin Ryu

Open Access Theses

Creating a more positive brand image in the competitive luxury hotel industry is an important goal for managers of such hotel brands. However, there are some skeptics as to the effectiveness of branding strategies of luxury hotels in developing a positive brand image for consumers. It has been suggested that consumers can be easily confused by the plethora of brand choices in the luxury hotel, making it difficult to remember a specific brand value differentiated from other choices. Based on psychographic research of luxury hotel consumers, these consumers have a tendency to prefer hedonic benefits stimulating emotional and symbolic benefits …

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Atmospheric Rural Community And Tourists' Experience -- China's Rural Tourism And Seniors' Quality Of Life, Jieyu Shi Dec 2017

Atmospheric Rural Community And Tourists' Experience -- China's Rural Tourism And Seniors' Quality Of Life, Jieyu Shi

Open Access Theses

The increasing percentage of aged populations in many parts of the world is an issue of global attention and significance. China is no exception and faced with a pressing challenge to find solutions for improving seniors’ quality of life. Extending the extant knowledge on the relationship between tourism and health, the current study posits that rural tourism, as a growing and popular form of leisure in China, can enhance the quality of life for both senior tourists and senior locals and proposes the concept of atmospheric community for rural tourism. This study develops the concept by investigating the elements of …

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Aging In Place In America: User Needs And Related Perceptions Concerning Showering Spaces, Denise Mcallister Wilder Dec 2017

Aging In Place In America: User Needs And Related Perceptions Concerning Showering Spaces, Denise Mcallister Wilder

Open Access Theses

The issue this study addresses is the apparent lack of curbless showers with grab bars and shower seats being displayed in builder’s model homes. Claims are they are excluded because consumers do not like to envision themselves as getting older or infirm. The purpose of the study is to query consumers of all age groups on their perception of photographed showers with and without curbs, grab bars and shower seats regarding safety, comfort and visual appeal. Data was collected using a survey instrument which featured several photographs of four different showers. Respondents were asked to rate their perceptions using a …

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Turning A Multivalent Lens Toward Depictions Of Artificial Intelligence (Ai) In Film, Ashley Ann Albrecht Dec 2017

Turning A Multivalent Lens Toward Depictions Of Artificial Intelligence (Ai) In Film, Ashley Ann Albrecht

Open Access Dissertations

With innovations in the field of artificial intelligence (AI) advancing at an exponential rate, it is ever the more pertinent to interrogate the ramifications and potentialities of these developments. Luciano Floridi, known as “the Google philosopher,” considers this phenomenon an integral part of the digital information age or the “Fourth Revolution.” We are now forced to confront the following problems: What is the relationship between humans and AI? What does it mean to be “human”? What futures are possible given our current coevolution with AI? Such questions motivate close philosophical consideration. Here, the theoretical polarization of the doomsday neo-Luddite versus …

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Elucidating The Biosynthetic Routes And Biological Mechanisms Involved In The Release Of Phenylpropanoid/Benzenoid Volatiles From Plant Cells, Funmilayo Adebesin Dec 2017

Elucidating The Biosynthetic Routes And Biological Mechanisms Involved In The Release Of Phenylpropanoid/Benzenoid Volatiles From Plant Cells, Funmilayo Adebesin

Open Access Dissertations

Sessile organisms, such as plants, have developed intricate means of responding and interacting with their environment in order to grow, reproduce, and survive environmental stresses such as attacks by other organisms and competition for resources with neighboring organisms. Plant volatile organic compounds (VOCs) play vital roles in resolving these evolutionary constraints associated with the sedentary nature of plants by attracting pollinators and seed dispersers necessary for reproduction. VOCs also mediate plant-plant interactions and provide defense against biotic stresses (pathogens, predators, and herbivores) and abiotic stresses (oxidative stress, high temperature stress, drought). Beyond the importance of VOCs to plants, humans have …

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Game On: Massively Multiplayer Online Games (Mmog) As Tools To Augment Teaching And Learning, Papia Bawa Dec 2017

Game On: Massively Multiplayer Online Games (Mmog) As Tools To Augment Teaching And Learning, Papia Bawa

Open Access Dissertations

The study investigated the use of Massively Multiplayer Online Games (MMOG) in English and Business classrooms in Higher Education from the context of learners’ performance outcomes, as well as stakeholders’ (learners, administrators, and faculty) perceptions pertaining to their experiences when using an MMOG based curriculum. The findings strongly suggest that MMOGs helped enhance learner performances in statistically significant ways, and provided valuable insights into elements of interest and concerns of stakeholders about MMOG usage in classrooms. Based on these insights, I designed a practitioners’ guide to assist future scholars interested in this curricular approach. This guide provides innovative tips on …

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Improving The Policy Specification For Practical Access Control Systems, Haining Chen Dec 2017

Improving The Policy Specification For Practical Access Control Systems, Haining Chen

Open Access Dissertations

Access control systems play a crucial role in protecting the security of information systems by ensuring that only authorized users are granted access to sensitive resources, and the protection is only as good as the access control policies. For enabling a security administrator to express her desired policy conveniently, it is paramount that a policy specification is expressive, comprehensible, and free of inconsistencies. In this dissertation, we study the policy specifications for three practical access control systems (i.e., obligation systems, firewalls, and Security-Enhanced Linux in Android) and improve their expressiveness, comprehensibility, and consistency. First, we improve the expressiveness of obligation …

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Cultivating Asian Students' Willingness To Communicate In American Classrooms Using An Online Video-Based Pre-Arrival Course, Hui-Ching Kayla Hsu Dec 2017

Cultivating Asian Students' Willingness To Communicate In American Classrooms Using An Online Video-Based Pre-Arrival Course, Hui-Ching Kayla Hsu

Open Access Dissertations

The purpose of this mixed methods study was: 1) to document the design and implementation process of an online video-based pre-arrival course that was intended to cultivate Asian students’ willingness to communicate in American Classrooms; 2) to assess the effectiveness of the course by measuring students’ oral proficiency and willingness to communicate; and 3) to investigate their first-year classroom participation as well as their experiences with the pre-arrival course. This research inquiry was guided by two research questions: 1) How does completing an online pre-arrival course influence Asian students’ speaking abilities, willingness to communicate, and verbal participation in their first-year …

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A Web-Based Intervention With Culturally Tailored Messages To Improve Mental Health Among Asian International Students With Mild-To-Moderate Depression: A Pilot Randomized Controlled Trial, Lan Jin Dec 2017

A Web-Based Intervention With Culturally Tailored Messages To Improve Mental Health Among Asian International Students With Mild-To-Moderate Depression: A Pilot Randomized Controlled Trial, Lan Jin

Open Access Dissertations

The study aims to: 1) design, develop, and test culturally tailored messages to address the mental health needs of Asian international students (AIS); and 2) assess the potential and acceptability of a web-based intervention (myCompass program) with culturally tailored messages to reduce depressive symptoms and improve related mental health outcomes among AIS with mild-to-moderate depression. The culturally tailored messages were designed, developed and tested through three focus groups (N=15), thirteen individual interviews (N=13), and an online survey (N=85) with AIS. Data was analyzed using the constant comparative method. The final cultural message themes used in the intervention arm included: 1) …

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Household Decision Making Under Stress: Three Essays On Agricultural Production In Southern Africa, Anna Leigh Josephson Dec 2017

Household Decision Making Under Stress: Three Essays On Agricultural Production In Southern Africa, Anna Leigh Josephson

Open Access Dissertations

Rural households in Southern Africa face numerous economic challenges, arising from a range of idiosyncratic and covariate risks. This research seeks to understand strategies employed by households to cope with different types of shocks, in the context of Zimbabwe and Malawi. I focus on several techniques used to cope with risk and shocks in an uncertain environment, including intra-household resource, land, and crop, as well as labor allocations. To provide insight on household decision making, I expand and adapt theoretical models. This helps me to better understand household decision making in the complex and risky environments in which they reside …

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Exploring Transformative Learning Pedagogies To Teach Human-Centered Design: A Collaborative Action Research Approach, Cole Hatfield Joslyn Dec 2017

Exploring Transformative Learning Pedagogies To Teach Human-Centered Design: A Collaborative Action Research Approach, Cole Hatfield Joslyn

Open Access Dissertations

In this research, I present the problem that a culture of disengagement endemic in engineering and engineering education (see Cech, 2014) is exacerbated by deeply rooted habits of mind and their underlying assumptions that are at odds with social justice ideals and resistant to change, thus, perpetuating the status quo (see Riley, 2008). Furthermore, current engineering education curricula focusing primarily on mathematics, science, and engineering sciences (see Sheppard, Macatangay, Colby, & Sullivan, 2009) further entrench this culture along with these habits of mind and assumptions. In an attempt to address the culture of disengagement, I propose a framework for humanizing …

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Engineering Play: Exploring Associations With Executive Function, Mathematical Ability, And Spatial Ability In Preschool, Zachary Samuel Gold Dec 2017

Engineering Play: Exploring Associations With Executive Function, Mathematical Ability, And Spatial Ability In Preschool, Zachary Samuel Gold

Open Access Dissertations

Engineering play is a new perspective on preschool education that views constructive play as an engineering design process that parallels the way engineers think and work when they develop engineered solutions to human problems (Bairaktarova, Evangelou, Bagiati, & Brophy, 2011). Early research from this perspective supports its use in framing play as a key learning context. However, no research to date has examined associations between engineering play and other factors linked with early school success, such as executive function, mathematical ability, and spatial ability. Additionally, more research is needed to further validate a new engineering play observational measure. This study …

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Reciprocal Relationships Between Parental Psychological Aggression And Adolescent Behavioral Problems, Yoonyoung Kwak Dec 2017

Reciprocal Relationships Between Parental Psychological Aggression And Adolescent Behavioral Problems, Yoonyoung Kwak

Open Access Dissertations

An extensive body of research has shown that parents’ harsh parenting and children’s behavioral problems are bidirectionally associated. These findings are in line with the transactional process theoretical model. Parental psychological aggression (PPA) is a nonphysical type of harsh parenting that is more prevalent among adolescents than corporal punishment and has rarely been tested for bidirectional relationships with diverse behavioral problems. This dissertation includes an investigation of the bidirectional relationship between PPA and four adolescent behavioral problems (delinquency, alcohol use, smoking, and running away) separately using samples from two different cultural contexts. The first sample is 591 adolescents who had …

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Probabilistic-Based Modeling Of Human Perceptual-Motor Behaviors With Application To Wheelchair Targeting Locomotion, Chih-Wei Li Dec 2017

Probabilistic-Based Modeling Of Human Perceptual-Motor Behaviors With Application To Wheelchair Targeting Locomotion, Chih-Wei Li

Open Access Dissertations

The objective of this thesis is to develop an empirically-based probabilistic model of the perception-action behaviors of human wheelchair locomotion and navigation over short distance ranges relevant for small space scenarios. More specifically, a probabilistic description and model is sought for the visual perception of distance and orientation with respect to objects, and for wheelchair locomotion based upon straight line and turning behaviors. Further, the specific behavior of manual wheelchair users boarding a small platform area, relevant for lifts and small elevators, is studied experimentally and in a probabilistic-based simulation. The approach taken consists of two parts. First, human subject …

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Developing And Testing A K-12 Engineering Epistemic Frame To Uncover Engineering In The Interactions Of A High School Summer Session, Tamecia Raishuan Jones Dec 2017

Developing And Testing A K-12 Engineering Epistemic Frame To Uncover Engineering In The Interactions Of A High School Summer Session, Tamecia Raishuan Jones

Open Access Dissertations

Educational reform has expanded K-12 standards to include engineering. Not only will K-12 teachers have to be trained to teach engineering concepts, but assessments must evolve to reflect the various aspects of engineering. Engineering as a profession is expressed via multiple dimensions of an epistemic frame, such as skills, knowledge, identity, values, and epistemology, but many of these elements are not measured in K-12 formal and informal spaces. In a summer session of a college preparatory program, a research project revealed that although students had design journals, storyboards, and traditional assessments, the in situ video recordings captured decisions, evolution of …

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An Investigation Of The Neural Circuitry Of Cued Alcohol Behaviors In P And Wistar Rats., Aqilah Maryam Mccane Dec 2017

An Investigation Of The Neural Circuitry Of Cued Alcohol Behaviors In P And Wistar Rats., Aqilah Maryam Mccane

Open Access Dissertations

Alcohol-paired cues invigorate alcohol-seeking and drinking behaviors in both rodents and individuals with alcohol use disorder (AUD). Additionally, genetic susceptibility plays a key role in alcohol addiction behaviors. Alcohol preferring (P) rats model both genetic vulnerability and symptoms of AUD. The basolateral amygdala (BLA), prefrontal cortex (PFC), hippocampus (HC) and nucleus accumbens (NA) are important brain regions involved in cued alcohol seeking. These regions are interconnected and their functional connections are hypothesized to be critical in the expression of motivated behaviors. Electrophysiological recordings in these four regions were collected in P rats engaged in a cued alcohol task. Data were …

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Exploring The Relationship Between Childhood Maltreatment And Adolescent Substance Use: Mediating Effects Of Family And Peer Relationships, Alexandra C. Marin Dec 2017

Exploring The Relationship Between Childhood Maltreatment And Adolescent Substance Use: Mediating Effects Of Family And Peer Relationships, Alexandra C. Marin

Open Access Dissertations

Child maltreatment is a key risk factor for maladaptive behaviors throughout the life course, including substance use. Although the effects of maltreatment on several domains of functioning have been thoroughly documented in past literature, the social mechanisms through which maltreatment affects individual trajectories have received considerably less attention, especially in relation to the contribution of different maltreatment dimensions (such as subtype, timing, and severity). Examining these dimensions and social mechanisms could hold the key to answering the question of why some maltreated children experience long-spanning negative developmental outcomes, while others maintain resiliency and are seemingly unaffected by these experiences. In …

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Effect Of Feed Additive Enzymes On Growth Performance And Immunological Response In Growing Pigs And Poultry, Emily R. Otto-Tice Dec 2017

Effect Of Feed Additive Enzymes On Growth Performance And Immunological Response In Growing Pigs And Poultry, Emily R. Otto-Tice

Open Access Dissertations

As demand for oilseeds and grains increase for uses beyond livestock feeds, swine and poultry producers are continually challenged to source alternative feed ingredients or co-products that are traditionally fed to ruminant animals. Many of these alternative feed ingredients have characteristics, such as higher fiber content or inherent antinutritional factors, that may reduce the feeding value for swine and poultry. To help improve the nutrient availability as well as understanding the positive affect that feeding fiber can have on gut health, biotech companies have developed novel enzymes to help breakdown these complex carbohydrate structures to release additional energy or reduce …

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Active Learning For Designing Detectors For Infrequently Occurring Objects In Wide-Area Satellite Imagery, Tanmay Prakash Dec 2017

Active Learning For Designing Detectors For Infrequently Occurring Objects In Wide-Area Satellite Imagery, Tanmay Prakash

Open Access Dissertations

For designing detectors for infrequently occurring objects in wide-area satellite imagery, we are faced with the challenge that such objects are difficult to find for the purpose of generating the needed training data. As a result, a human agent must expend an inordinate length of time in order to produce a sufficient number of labeled training data. In this dissertation, we reduce this annotation burden by drawing upon the research that has been carried out recently in the area of active learning, whereby the machine searches for human annotation those unlabeled samples that can actually improve the detector. The search …

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A Closer Look: How Middle School Principals' Perceptions About Teacher Mindset Impact Instructional Coaching, Jayson P. Snyder Dec 2017

A Closer Look: How Middle School Principals' Perceptions About Teacher Mindset Impact Instructional Coaching, Jayson P. Snyder

Open Access Dissertations

The purpose of this qualitative study was to examine how a middle school principal’s perception about a teacher’s mindset affects how he provides that teacher with coaching and feedback as an instructional leader. The research took an in-depth look at two middle school principals with experience as teacher evaluators and instructional leaders. The theoretical framework for this qualitative study was phenomenology. All data came from interviews conducted with middle school principals. Interviews were audio recorded, transcribed, and confirmed prior to individual and team coding and data analysis. The study was designed to shed light on how a middle school principal’s …

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Prone To Drone: Unmanned Aircraft Systems' Effects On Public Support For The Use Of Military Force, William Shelby Dec 2017

Prone To Drone: Unmanned Aircraft Systems' Effects On Public Support For The Use Of Military Force, William Shelby

Open Access Dissertations

Unmanned aircraft systems (drones) have seen widespread use by the United States in the “War on Terror.” Drones keep soldiers out of harm’s way and they reduce the financial cost of military operations, all while maintaining high levels of precision like regular soldiers. Because they provide the benefits of using force without the risks, drones could make the public more willing to support the use of force. If true, the public may be more prone to support using force rather than seek out other alternatives to solve a foreign policy crisis because they perceive less risk involved in using force. …

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