Digital Commons Network^™

The Glass Ceiling: Exploring The Leadership Journey Of Men And Women In High-Tech, Shelia Faye Krueger

Dissertations

The literature is replete with evidence of the proliferation of women entering into the workplace, their remarkable progress in attaining higher education, their overrepresentation in professional and management roles, and their placement in CEO leadership positions in certain high-profile S&P 500 global companies. Yet women continue to be noticeably underrepresented in leadership roles, especially in high tech companies. Through the lenses of social constructivist and feminist theories of gender stereotypes, social/gender roles, and role congruity expectations, this instrumental case study was conducted to gain insight into the reasons women are underrepresented in leadership roles in high tech and the ways …

Membrane-Based Removal Of Ammonia From A Waste Stream And Its Recovery, Philip A. Aligwe

Dissertations

At neutral pH levels, ammonia in aqueous streams exists in two forms: ammonium ion (NH₄⁺) and dissolved ammonia gas molecules (NH₃). Membrane separation serves as a viable option for treatment of ammonia containing effluents. This can be achieved via by stripping NH₃ from an ammonia feed solution at feed solution pH > 11 via hollow fiber supported gas membrane (SGM) or removing NH₄⁺ from an ammonia feed solution at feed solution pH < 7 via liquid or polymeric membranes.

The first study reported here examines the influence of feed volumetric flow rates on outlet NH₃ concentrations in parallel flow …

Acupuncture For Symptom Management In A Menopausal Population: An Exploration Of Mechanism And Experience, Cheryl L. Wright

Dissertations

This early phase study examined the effects of a series of ten standard-protocol acupuncture treatments over four weeks in 12 healthy, but symptomatic, menopausal women. In addition to measuring two biologic markers that may shed light on the physiologic impact of acupuncture, symptom experience data were collected.

The Effect Of The Missouri Preschool Program On School Readiness, Madeline June Allin

Dissertations

National policymakers, practitioners, and researchers have consistently questioned how to develop the necessary skills for the nation’s youth to meet the challenges of the 21st century. The answer points directly to the provision of highquality early childhood programs to prepare children for entrance to kindergarten and put them on a trajectory toward lifelong positive outcomes (Ferrarello, 2017; Phillips et al., 2017). The Missouri Preschool Program is a high-quality, state grant-funded program, with grant priority given to schools serving a large number of disadvantaged children (MODESE, 2018a). The purpose of this quantitative causal-comparative study was to compare the school readiness skills …

Empirical Studies Of Deep Learning On Information Diffusion On Social Networks And Collective Task Learning For Swarm Robotics, Trung T. Nguyen

Dissertations

Researchers in multiple disciplines have recently adopted deep learning because of its ability of high accuracy representation learning from big and complex data. My research goal in this thesis is developing deep learning models for information diffusion analysis on social networks and collective tasks learning in swarm robotics. Firstly, the information diffusion on social networks is modeled as a multivariate time series in three dimensions with ten features. Then, we applied time-series clustering algorithms with Dynamic Time Warping to discover different patterns of our models. Then, we build a prediction model based on LSTM, which outperforms traditional time-series prediction methods. …

Core Subject Integration In The K-6 Music Classroom, Rose Bowe

Dissertations

Federal legislation through No Child Left Behind (NCLB) (2002) and Every Student Succeeds Act (ESSA) (2015) held schools accountable for improved test scores and academic achievement. The heightened scrutiny in performance and expectations placed enormous pressure on students, teachers, and administrators to reach the lofty goals of the accountability model and put emphasis on state-mandated tests for several subjects. Non-tested subjects often encountered a shift in funds and their programs became diminished or even eliminated. Subjects that were not tested, such as music education, were considered non-essential. Nonetheless, the value of music used for instruction to stimulate knowledge retention was …

Teacher Beliefs And The Intent And Current Use Of Movement As It Influences Students With And Without Adhd, Kimberly Mcquagge

Dissertations

The purpose of this study was to add to the knowledge base regarding utilizing movement in the classroom as it influences reading and mathematics achievement for students with and without Attention-Deficit Hyperactivity Disorder. Mississippi public school teachers (n= 379) responded to an online questionnaire that gathered demographic data and collected ratings based on teacher beliefs and both their current use of movement and intent to use movement in the classroom based on a 5-point Likert scale.

In order to predict if a relationship existed between teacher beliefs of utilizing movement in the classroom and both their current use of movement …

Machine Learning Approaches For Improving Prediction Performance Of Structure-Activity Relationship Models, Gabriel Idakwo

Dissertations

In silico bioactivity prediction studies are designed to complement in vivo and in vitro efforts to assess the activity and properties of small molecules. In silico methods such as Quantitative Structure-Activity/Property Relationship (QSAR) are used to correlate the structure of a molecule to its biological property in drug design and toxicological studies. In this body of work, I started with two in-depth reviews into the application of machine learning based approaches and feature reduction methods to QSAR, and then investigated solutions to three common challenges faced in machine learning based QSAR studies.

First, to improve the prediction accuracy of learning …

Statistical Downscaling Techniques To Enhance The Spatial Resolution Of The Grace Satellite Data And To Fill Temporal Gaps, Hossein Sahour

Dissertations

The Gravity Recovery and Climate Experiment (GRACE) has been successfully used to monitor variations in terrestrial water storage (GRACE_TWS ) and groundwater storage (GRACE_GWS) across the globe, yet such applications are hindered on local scales by the limited spatial resolution of GRACE data. Using the Lower Peninsula of Michigan as a test site, I developed optimum procedures to downscale GRACE Release-06 monthly mascon solutions. A four-fold exercise is conducted. Cluster analysis is performed to identify the optimum number and distribution of clusters (areas) of contiguous pixels of similar geophysical signals (GRACE_TWS time series); three clusters are …

Effects Of Exercise On Myeloid-Derived Suppressor Cell-Related Tumor Progression And Metastasis, Jacob Garritson

Dissertations

Garritson, Jacob. Effects of Exercise on Myeloid-Derived Suppressor Cell-Related Tumor Progression and Metastasis. Published Doctoral Dissertation, University of Northern Colorado, 2020. Myeloid-derived suppressor cells (MDSCs) are potent suppressors of immune function and may play a key role in the development and progression of metastatic cancers. Aerobic exercise has been shown to have anticancer effects, yet the mechanisms behind this protection are largely unknown. Purpose: to determine the effects of physical activity on MDSC accumulation and function. Methods: Female BALB/c mice were assigned to one of two primary groups: sedentary tumor (SED+TUM) or wheel run tumor (WR+TUM). After 6 weeks of …

The Role Of Masculinity In The Development Of Capability For Suicide, Claire Houtsma

Dissertations

Males account for over two-thirds of suicide deaths annually. Additionally, more than 50% of American suicide deaths annually are firearm-related. Suicide risk is elevated within firearm owning households and men are more likely to own firearms, which suggests that male firearm owners are at disproportionate risk for suicide. Prior research has argued that certain stereotypically male traits (e.g., lack of help-seeking) may explain sex differences in suicide death; however, this remains a poorly understood phenomenon. Male gender norms (e.g. physical toughness, self-reliance) may contribute to the development or expression of capability for suicide, primarily through their impact on behavior. The …

Using Two Reinforcement Contingencies To Alter Teachers' Rates Of Praise, Ashleigh Eaves

Dissertations

The current study evaluated the effects of a positive and negative reinforcement contingency on teachers’ use of behavior specific praise (BSP) in the educational setting. An alternating treatments design was used across four participants in a rural, Southern elementary to determine if one or both conditions was successful in increasing the use of BSP. Data were collected on teachers’ use of BSP, general praise, general reprimands, and behavior specific reprimands (BSR). Additionally, student engagement in academically-associated and/or disruptive behaviors was measured throughout baseline, treatment, and follow-up phases. Results indicate both the positive and negative reinforcement contingency were successful in improving …

The Roles Of Violence Exposure And Gender On The Relationship Between Adolescent Psychopathic And Conduct Disorder Traits And The Capability For Suicide, Tiffany Harrop

Dissertations

Suicide represents one of the leading causes of mortality for adolescents. Externalizing behaviors, such as psychopathic and conduct disorder traits, represent risk factors for adolescent suicide. Investigation of suicide capability is especially important, as it is theorized to distinguish individuals who evince suicide ideation from those who progress to making a suicide attempt. Currently, associations between psychopathic and conduct disorder traits and capability in youth are understudied, as well as factors that may potentiate these associations, such as exposure to violence and gender. The aim of this study was to explore the interactive nature of psychopathic and conduct disorder traits, …

Resource Optimization In Support Of Iot Applications, Ihab Ahmed Mohammed

Dissertations

With the rise of the Internet of Things (IoT) and smart communities, managing computation and communication resources required by billions of smart devices becomes a concern. To tackle this problem, we develop algorithms for resource management to ensure better Quality of Service (QoS), safety, and performance. We focus our efforts on three problems.

In the first problem, we studied the strict QoS requirements of applications and differentiated service requirements in different situations of vehicular networks. We propose a generic prioritization and resource management algorithm that can be used to prioritize the processing of received packets in vehicular networks. We formulate …

The Assessment Of Co2 Exposures, Workload Demands, And Musculoskeletal Disorder Risk On Heart Rate For Select Craft Brewery Job Tasks, David L. Huizen

Dissertations

Americans have embraced craft beer, and the ensuing demand has resulted in an ever-increasing number of craft breweries opening over the past 20 years. Craft brewers are generally small employers and, as such, lack the resources necessary to address the safety and health of their employees adequately. Brewers face many safety and health hazards in their work environment. These hazards include exposures to carbon dioxide (CO₂), workload demand, and MSD risk. It is essential to evaluate these hazards in craft breweries as they handle carbon dioxide (CO₂) differently than large breweries by having the CO_{2 …}

Essays On Climate Change-Related Extreme Events, Alvin E. Harris

Dissertations

There are increasing and urgent calls for global economies to join in the fight against the impacts of climate change (World Bank, 2020). With reports such as the World Bank (2020) of climate change costing billions of dollars in losses for economies, the purpose of my dissertation is to examine the effects of climate change-related extreme events and their potential economic effects in three areas: agriculture, migration, and the labor market.

My first essay focuses on the factors that influence farmers’ perception of risk and adaptive strategies against the effects of climate change-related extreme events. I examine whether farmers’ social …

A Qualitative Study Of The Preparedness Of Novice Teachers To Teach Effectively In A Blended Learning Environment, Rachelle R. Lafave

Dissertations

Proponents of the effective use of blended learning argue that without technologyenhanced instruction, students graduate from high school missing the digital skills they need to be successful competitors in the labor market (Dickinson, 2018). Yet, authors of supporting work have established technology-enhanced instruction can have a negative effect on student achievement (Newman & Dickinson, 2017). Examined in this qualitative study was the preparedness of novice teachers to provide effective instruction in a blended learning environment, as researchers have found teacher self-efficacy is the number one predictor of instructional quality (Belanger, 2018; Conant, 2016; Künsting, Neuber, & Lipowsky, 2016). Self-efficacy is, …

The Role Of Plasticity In Bumble Bee Responses To Environmental Variability, Matthew Austin

Dissertations

An aim of contemporary biology is elucidating the causes and consequences of phenotypic plasticity. Here, I approach this aim by exploring the eco-evolutionary dynamics of phenotypic plasticity and environmental variability in bumble bees (Apidae: Bombus), a congeneric clade of eusocial pollinating insects. Throughout their evolution, bumble bees have encountered spatiotemporal variability imposed by dynamic floral environments. Today, bumble bees additionally encounter spatiotemporal variability imposed by anthropogenic environmental change. In this dissertation, I explore how phenotypic plasticity affects how successfully bumble bees respond to environmental variability imposed by anthropogenic global change (Chapters 1 and 2) and their floral resources (Chapters …

Exploring The Impact Of Insecure Attachment Styles In Couple Adjustment Through The Lens Of Cluster B Pathology, Laura Bonnemort

Dissertations

The current body of research literature appears to lack adequate studies focused on individuals who possess an insecure attachment, potential cluster B personality pathology, and who are engaged in couple discord. The following clinical research project explored how insecure attachments impact the trajectory of both cluster B pathology and adult couples’ relationship discord. Studies reviewed included adults diagnosed with mood disorders, personality pathology, and those engaged in couples therapy due to dissatisfaction and discord. Developing an insecure attachment in childhood appears to place adults at risk for higher rates of personality pathology and risky romantic relationships fraught with discord. Evidence-based …

Cultural Homelessness, Self-Esteem, And Skin Color Satisfaction Among Latinxs, Josephine M. Almanzar

Dissertations

This study explored feelings of cultural homelessness, self-esteem, and skin color satisfaction among Latinxs. A close interest was placed in examining responses of participants who identified as racially Black or Afro-Latinx. Through an electronic survey, the study aimed to answer the four research questions: (1) Is there a correlation between cultural homelessness, self-esteem, and skin color satisfaction; (2) Do participants of different self-perceived skin colors differ in self-esteem, cultural homelessness, and skin color satisfaction; (3) Does age moderate the relationship between self-perceived skin color and self-esteem; and (4) Does age moderate the relationship between self-perceived skin color and cultural homelessness. …

Participation In Sporting Activities As A Mechanism For Enhancing Science Instruction, Erin Roades

Dissertations

ABSTRACT

After students have taken years of science classes, they still believe science content is disconnected to the “real” world or to their lives. Teaching without attention to relevance results in decreased motivation for learning and negative attitudes toward science. An instructional method incorporating physical, sport-related activities was used to develop relevance and enhance achievement in science compared to typical/traditional science instructional methods. In the typical method, science lessons consisted of front-loading science content through direct instruction followed by a laboratory activity to confirm lesson content. The experimental teaching strategy used was “Relevance Integration for Teaching Science using Sports Exploration” …

Neurobiological Mechanisms Of Cognitive Processing Therapy For Post-Traumatic Stress Disorder: A Brain Network Approach, Tessa Vuper

Dissertations

Psychotherapy research is increasingly targeting both psychological and neurobiological mechanisms of therapeutic change. This trend is evident in and applicable to post-traumatic stress disorder (PTSD) treatment research given the high nonresponse rate of individuals with PTSD who undergo cognitive-behavioral therapy (CBT). A review of the literature investigating neurobiological mechanisms of CBT in PTSD reveals inconsistent results that fail to fully support dual process or learning models of CBT effects in the brain. However, network-based models of psychopathology provide a new framework from which to understand both mental disorder symptoms and therapeutic mechanisms. The current study investigated a) whether brain networks …

The Effects Of Low Dose Lysergic Acid Diethylamide Administration In A Rodent Model Of Delay Discounting, Robert J. Kohler

Dissertations

The resurgence of Lysergic Acid Diethylamide (LSD) as a therapeutic tool requires a revival in research, both basic and clinical, to bridge gaps in knowledge left from a previous generation of work. Currently, no study has been published with the intent of establishing optimal microdose concentrations of LSD in an animal model. In the present study, rats were administered a range of LSD doses to quantify potential augmentations in choice behavior in a rodent model of delay discounting. In the first experiment, rats were administered LSD (20 or 40 μg/kg, i.p.) or saline at the start of terminal baseline training …

Relationships Between Ethnicity, Attitudes Toward Institutional Authority, And Hope In The African American Community, Garnadette Stuckey

Dissertations

Abstract

A set of two mixed method studies were conducted to examine attitudes toward institutional authority and to understand how the presence of societal authority and oppression can impact individual and community capacity for hope and full freedom. Researchers have discussed concepts such as attitudes to authority, suggesting that some individuals are naturally more resistant to authority (Rigby, 1985). However, in the United States, racial disparities are great, particularly when the “authority” is a police officer in an urban community and the individual is African American. In African American communities in the U.S., interactions with authority figures begin in childhood. …

Gaps In The Mental Health System,Justice System And The Transition To Adulthood: An Analysis Of Unmet Needs, Maria Gremli Sanders

Dissertations

ABSTRACT More than two million adolescents and young adults are interconnected with the justice system every year. An alarming number of transitional age young adults (ages 17-25 years) in the United States justice system suffer with serious emotional problems that have at least one diagnosable mental health illness. The multiple needs for rehabilitation among these young adults have often gone unmet, and thus, they have become an extremely vulnerable subgroup in the justice system. The purpose of this study was to explore issues of disparity within mental health services, the justice system, and the unmet needs of transitional age young …

Computer-Based Learning: Effects On Student Learning And Interpretation Of Curriculum, Hasani Jackson

Dissertations

ABSTRACT In 2010, the Superintendent of Prestige School District (a pseudonym) implemented online learning programs that would cater to student learning while increasing achievement. With the adoption of computer-based programs into Prestige School District System, curriculum specialists wanted to align programs to the Common Core State Standards initiated by the Department of Education. Through gathering quantitative and qualitative data on behalf of various stakeholders within Prestige School District, the goal of this study was to uncover the key elements of online learning programs that can be improved to enhance student achievement. Results provide a foundation for positive learning initiatives that …

The Relationship Between Neuropsychological Functioning, Biomarker Av-1451, And Subjective Memory Impairment In A Cognitively Normal Sample, Amberrose Reale-Caldwell

Dissertations

Mild cognitive impairment (MCI) is often a prodromal stage for Alzheimer’s disease (AD) development, with those diagnosed with MCI at increased risk for developing AD. The present study aimed to provide data to support a prodromal stage of MCI via analysis utilizing the neuropsychological domain of memory, subjective memory impairment (SMI), and the PET tau biomarker, AV-1451. It was hypothesized that individuals with SMI would differ significantly from participants without SMI (nSMI) on measures of memory and level of tau binding in the entorhinal cortices and the hippocampi. It was further hypothesized that differences in memory would be mediated by …

Anticonvulsant And Procognitive Effect Of Nonimidazole Histamine H3r Receptor Antagonists /Inverse Agonists In Experimental Animal Models, Alaa Imad Alachkar

Dissertations

Epilepsy is a common chronic neurological disorder accompanied by cognitive impairment. Available antiepileptic drugs (AEDs) have not been reported to have ameliorative effects on epilepsy-associated memory impairment. The potential of histamine H3 receptors (H3R) in several neuropsychiatric diseases, including epilepsy and Alzheimer’s disease, is well recognized. In this study, a series of H3R antagonists (1-16) were screened for their in vivo anticonvulsant effect in several acute-induced seizures in rats. Moreover, the procognitive effect of the most promising H3R antagonist was investigated in dizocilpine (DIZ)-induced amnesic effect applying several behavioral memory tests. Furthermore, the most promising H3R antagonist was assessed for …

Choosing To Be A Teacher: Understanding The Career Choice Of Academically Excellent University Students Who Had Graduated From High Performing High Schools In The Dominican Republic, Marcela Maria Fuster De Hernàndez

Dissertations

Teachers’ salaries in the Dominican Republic (DR) have become competitive, but there is a noticeable tendency for high performing students from high performing high-schools to avoid selecting teaching as a career (Figueroa & Montes de Oca, 2014). Such students often have choices to enter higher paying and status careers. Yet, some such students are now studying to become teachers, and this research captures their voices around this career choice. This topic is important given the need to improve the academic profile of future teachers who can help improve the Dominican ratings on various international measures.

This study involved 13 semi-structured …

The Biological, Psychological, Cognitive, And Social Perspectives On Aging: The Design Of A Healthy Aging Program For Older Adults, Melissa Santiago

Dissertations

Aging is an inevitable process, accompanied by changes in physiological, cognitive, psychological, and social facets. Researchers have investigated the physiological, cognitive, psychological, and social risk factors associated with aging and have encouraged the use of physical activity, cognitive training, and dietary interventions to alleviate risk factors. However, holistic programs dedicated to promoting successful aging among older adults are uncommon. This review sought to promote successful aging by identifying physiological, cognitive, psychological, and social risk factors that affect older adults and develop a comprehensive program to holistically mitigate these risk factors. Risk factors associated with unsuccessful aging include the development of …