Digital Commons Network^™

Using Distributed Ledger Technologies In Vanets To Achieve Trusted Intelligent Transportation Systems, Fares Nabil Elamine

Graduate Theses, Dissertations, and Problem Reports (ETD)

With the recent advancements in the networking realm of computers as well as achieving real-time communication between devices over the Internet, IoT (Internet of Things) devices have been on the rise; collecting, sharing, and exchanging data with other connected devices or databases online, enabling all sorts of communications and operations without the need for human intervention, oversight, or control. This has caused more computer-based systems to get integrated into the physical world, inching us closer towards developing smart cities.

The automotive industry, alongside other software developers and technology companies have been at the forefront of this advancement towards achieving smart …

Insect Community Associated With Black Cherry (Prunus Serotina) In The Allegheny National Forest, Craig James Larcenaire

Graduate Theses, Dissertations, and Problem Reports (ETD)

Black cherry (Prunus serotina Ehrh.) is valuable species managed for its economic and ecologic benefits. This species grows best in the environment of the Allegheny Plateau region in northwestern Pennsylvania. Land managers on the Allegheny National Forest (ANF) have been managing black cherry for a variety of goals and purposes. Over the last few decades, the land managers have noticed a decline in the natural regeneration of black cherry in the forest. Because the black cherry flowers are self-incompatible and require animal pollinators to transfer the pollen from one tree to another one hypothesis for this decline could be …

Three Essays On Energy And Agricultural Price Analysis, Sara Farhangdoost

Graduate Theses, Dissertations, and Problem Reports (ETD)

This dissertation consists of three essays on energy and agricultural commodity price analysis: 1) Natural Gas Price Forecasting in a Changing World; 2) The Effect of EIA Storage Announcement on Natural Gas Returns: A Comprehensive Analysis; and 3) Forecasting the U.S. Season-Average Farm Price of Corn: Derivation of an Alternative Futures based Forecasting Model.

The first essay evaluates the performances of various individual and composite forecasting models when predicting natural gas prices in the United States. The empirical results show that forecast generated by the Energy Information Administration Short-Term Energy Outlook provides a more accurate price prediction at longer forecasting …

A Survey Of Musical Expectations In The Marine Forces Reserve Band Stationed In New Orleans, Louisiana, Brandon Paul Carbonari

Graduate Theses, Dissertations, and Problem Reports (ETD)

This research document examines the musical expectations of United States Marines serving in the Marine Forces Reserve Band from 2017 to 2021. Chapter One of this study provides a detailed foundation of the musical and non-musical responsibilities of a United States Marine musician. Training regime, rehearsal schedule, and logistical area responsibilities will be described to help convey the full scope of duty. The source material for Chapter One includes dissertations, journal articles, published books, online sources, and interviews. Chapter Two provides results of a survey that was conducted with members of the band. The questions were designed to record the …

Judicial Independence In Pakistan: A Case Study Of Lawyers’ Movement, 2007-2009, Shabbir Ahmad Khan

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study focuses on a social movement, the Lawyers’ Moment 2007-2009 of Pakistan, a transitioning democracy, which brought vast changes in its judicial system, especially in terms of its judicial independence. There are three main research questions in this study: 1) the status of judicial independence before the Lawyers’ Movement; 2) was judicial independence a major goal in the Lawyers’ Movement? and 3) did the Lawyers’ Movement alter the status of judicial independence? The research methodology used to explore the answers to these questions also has three main sources: 1) the literature which explains some areas of scholarship in social …

Modeling, Optimization And Uncertainty Quantification Of Solids-Based Co2 Capture Technologies, Anca Ostace

Graduate Theses, Dissertations, and Problem Reports (ETD)

Solids-based carbon dioxide (CO₂)adsorption, where CO₂ is adsorbed under high pressure/low temperature and desorbed at low pressure/high temperature, is a low energy consumption capture technology with high carbon uptake efficiency. Chemical looping combustion (CLC), where a solid oxygen carrier (OC) transports oxygen between two high-temperature reactors – a fuel and an air reactor –, is a low energy penalty, fuel-flexible technology with inherent CO₂ capture for power/heat and syngas production.

In this work, state-of-the-art equation-oriented (EO) mathematical models of a fixed-bed (FxB) contactor for CO₂ adsorption and moving-bed (MB) reactors for gas-, and solid-fueled CLC …

Microwave-Assisted Natural Gas Conversion To Value-Added Chemicals, Xinwei Bai

Graduate Theses, Dissertations, and Problem Reports (ETD)

Stranded gas is a raw gas mixture of volatile hydrocarbons where the main composition is methane. The producers flare the stranded gas at the site because the cost of collecting and transporting the gas is higher than the value of the gas itself. To reduce the waste of this natural resource, it is worthwhile to utilize the on-site stranded natural gas as feedstock to produce value-added chemicals without emitting greenhouse gas. Direct natural gas conversion process is more desirable because of lower capital investment. Methane and ethane, the two major components of natural gas, are very stable molecules that usually …

Identification And Classification Of Radio Pulsar Signals Using Machine Learning, Di Pang

Graduate Theses, Dissertations, and Problem Reports (ETD)

Automated single-pulse search approaches are necessary as ever-increasing amount of observed data makes the manual inspection impractical. Detecting radio pulsars using single-pulse searches, however, is a challenging problem for machine learning because pul- sar signals often vary significantly in brightness, width, and shape and are only detected in a small fraction of observed data.

The research work presented in this dissertation is focused on development of ma- chine learning algorithms and approaches for single-pulse searches in the time domain. Specifically, (1) We developed a two-stage single-pulse search approach, named Single- Pulse Event Group IDentification (SPEGID), which automatically identifies and clas- …

Analysis Of Millimeter-Wave Networks: Blockage, Antenna Directivity, Macrodiversity, And Interference, Enass Hriba

Graduate Theses, Dissertations, and Problem Reports (ETD)

Due to its potential to support high data rates at low latency with reasonable interference isolation because of signal blockage at these frequencies, millimeter-wave (mmWave) communications has emerged as a promising solution for next-generation wireless networks. MmWave systems are characterized by the use of highly directional antennas and susceptibility to signal blockage by buildings and other obstructions, which significantly alter the propagation environment. The received power of each transmission depends on the direction the corresponding antennas point and whether the signal’s path is line-of-sight (LOS), non-LOS (i.e., partially blocked), or completely blocked. A key challenge in modeling blocking in mmWave …

Successful Event Fundraising Strategies For Nonprofit Museums, Stacie Barrett

Walden Dissertations and Doctoral Studies

Some museum nonprofit organizational leaders are experiencing financial losses. Less than 25% of nonprofit agencies in the United States have enough funds to operate for six months. Museum nonprofit leaders are concerned with financial losses because the decrease in financial support can cause decreased operational funding and prohibit museum nonprofit leaders from carrying out the organizational mission. Grounded in Ajzen’s theory of planned behavior, the purpose of this qualitative single case study was to explore successful event fundraising strategies nonprofit managers use to increase financial support. The participants were three successful nonprofit museum leaders who had fundraising responsibilities. The study …

Relationship Between Employee Perception Of Work Experience, Employee Perception Of Supervisors, And Intent To Leave, Kathryn F. Denning

Walden Dissertations and Doctoral Studies

Employee turnover can be costly; estimates for recruiting and training new hires are between 90% and 200% of the employee's annual salary. Understanding employee intent to leave is critical for managers to reduce turnover rates. Grounded in Herzberg’s two-factor model, the purpose of this quantitative correlational study was to examine the relationship between federal government agency employees' perception of their work experience, employee perception of supervisors, and employee intent to leave. Secondary data from 359,120 completed surveys from the 2020 Federal Employee Viewpoint Survey (FEVS) were analyzed. The results of the binary logistic regression were significant, X2 (359,120) = 17609.539, …

African American Students’ Experiences With Teachers’ Discriminatory Behavior In The School-To-Prison Pipeline, James Anthony Douglas

Walden Dissertations and Doctoral Studies

AbstractAfrican American students have been affected by the School-to-Prison pipeline detrimentally. The disproportionate expulsions of African American students from schools have resulted in their overrepresentation in prison. Racial inequity has made African American students more prone to suspensions than Caucasian students, resulting in African American students missing classes and falling behind academically. The purpose of this qualitative case study was to explore how minor disciplinary violations may be perceived as a threat to African American students, funneling them into the school-to-prison pipeline. The theoretical framework was based on Bertalanffy’s general system theory. Data were collected using open-ended, semi structured interviews …

Secret Keeping And Subjective Well-Being In Nurses, Augustina Marie Frazier

Walden Dissertations and Doctoral Studies

Studies suggest that “secret-keeping,” the act of maintaining confidences or personal information, is a problem in the nursing population. Secret keeping may cause depression and anxiety, which might bring about isolation and reduce the ability to provide patient care. The purpose of this study was to address the gap in the literature concerning the relationship between secret-keeping and subjective well-being among early- and late-career nurses. Nurses are those who primarily work at the bedside and who supply the nursing labor force in health cares. I used Seligman's well-being theory to focus on the nurses’ happiness based on positive psychology. The …

Investigating Preservice Teachers’ Science Teaching Self-Efficacy: An Analysis Of Reflective Practices, Deepika Menon, Saiqa Azam

Department of Teaching, Learning, and Teacher Education: Faculty Publications

The purpose of this mixed methods research was to investigate the development of 55 preservice elementary teachers’ science teaching self-efficacy beliefs through analysis of their reflective practices in a science method course. This year-long study was conducted at two public universities located in the USA and Canada. Within the theoretical frameworks of science teaching self-efficacy and reflective practice, we examined how and in what ways preservice teachers’ reflections on their past science experiences and current science teaching practices contributed to their self-efficacy beliefs. Data were collected from pre- and post-course administrations of the Science Teaching Efficacy Belief Instrument-B (STEBI-B), written …

Graduates’ Perception Of History Education In Jamaican High Schools, Patricia Cecile Edwards

Walden Dissertations and Doctoral Studies

AbstractResearchers have shown that history education is valuable, but it is not a popular subject of choice among secondary and postsecondary students in several parts of the world. In Jamaica, fewer students have taken the Caribbean Secondary Education Certificate (CSEC) examination in history education in the decade beginning in 2010 than in the decade before. The threefold purpose of this basic qualitative study was to investigate the perception of graduates of Jamaican high schools about what influenced their decision when they selected or deselected history education at the CSEC examination level, what career decision making factors they perceived influenced their …

Subclinical Stress On Obesity Among Obese African American Women, Dr. Nosakhare Osasu Idehen

Walden Dissertations and Doctoral Studies

AbstractObesity is a complex disease linked to genetics, health behaviors, upstream social determinants of health, and psychosocial stress. Obesity-related chronic diseases and opportunity cost significantly impact individuals and communities. Current prevention policies focus on diet and exercise without demonstrating the benefits of stress coping strategies in obesity management. Subclinical racial minority and gender stress heighten hypervigilance, psychological overload, poor stress coping strategies, inflammation, and obesity. Subclinical stress varies with race and gender, and it is higher in African American (AA) women. The purpose of this qualitative study was to explore the lived experience of subclinical racial minority and gender stress …

Leadership Styles For Creating Shared Value In Small And Medium-Sized Enterprises, Joshua Oisedebame Ilevbare

Walden Dissertations and Doctoral Studies

Lack of alignment between leadership style and strategy contributes to the failure of many small and medium-sized enterprise (SME) leaders to realize their potential for creating shared value (CSV). Aligning leadership styles with CSV strategies improves the ability of Nigerian SME leaders to create economic and social value for all stakeholders of their enterprise. Using four contingency theories of leadership as a conceptual framework, the purpose of this multiple case study was to explore strategies SME leaders use for aligning leadership style and business strategy for CSV. The participants comprised 11 owners or senior managers from four SMEs in the …

Depression And Time Spent On Facebook Predicting Facebook Usage And Social Support, Donald W. Kincaid

Walden Dissertations and Doctoral Studies

Social media is a medium of communication worldwide, but it is not clear whether there is a relationship between depression and the use of social media. The purpose of this research was to explore this possible relationship. The stress generation hypothesis of depression (SGHD) states that people with depression encounter higher rates of stress than their nondepressed counterparts. In the context of social media, people with depressive symptoms may use social media in ways that increase their stress and worsen their depressive symptoms. To test this hypothesis, this study was designed to determine whether a higher level of maladaptive Facebook …

Hpv Vaccination Rates Among Males In Minority Populations, Andrew Lemke

Walden Dissertations and Doctoral Studies

Ethnic minorities are less likely to be vaccinated in comparison to White individuals. As a result, Blacks have one of the highest rates of human papillomavirus (HPV)-related complications. The purpose of the quantitative study was to identify significant factors predicting initiation of HPV vaccination in Black male adolescents. The study was based on the constructs of Ajzen’s theory of planned behavior and used a cross-sectional design that involved weighted data from the 2018 National Immunization Survey (n=395,067) conducted by the Centers for Disease Control and Prevention. The research questions were based on how factors such as fear, family involvement, sexual …

Exploring Elementary Education Teachers’ Instruction Of Academic Language For English Language Learners, Irina Malykhina

Walden Dissertations and Doctoral Studies

General education teachers who teach language arts, math, science, and social studies are challenged with incorporating academic language instruction into content instruction for English language learners (ELLs). Little is known about how general education teachers use instructional strategies for teaching academic language to ELLs. A deeper understanding of teacher experiences with implementing academic language instruction to ELLs can help guide future efforts to collaborate on implementation for effective literacy programs that address ELLs’ academic language needs. The purpose of this qualitative case study was to explore how elementary general education teachers plan, implement, and assess academic vocabulary instruction to ELLs. …

Striving For Homeostasis: Balancing The Inclusion Of Students With An Emotional/Behavioral Disorder, Rob Mcgarva

Walden Dissertations and Doctoral Studies

Social justice advocates have championed inclusive education, leading to its adoption in many jurisdictions. Despite policy changes designed to support learners with disabilities and research on inclusive education, students with an emotional/behavioral disorder (EBD) experience significantly poorer outcomes than their peers. Teachers often describe including this group of students as impossible and attempts to achieve inclusion often result in extreme stress. Research has identified proven inclusion strategies, but there are often problems with implementation in real-world settings. There is a research gap concerning how teachers understand and select interventions. Classic grounded theory methodology was used to identify the primary concern …

The Effects Of Foreign Direct Investment On Gender Inequality In Uganda, Peter Oogu

Walden Dissertations and Doctoral Studies

Abstract Gender inequality is one of the greatest global development challenges. In the developing countries, including those in Sub-Saharan Africa, work-place gender inequality hinders the emancipation of women. The purpose of this quantitative study was to analyze the effects of foreign direct investment on gender inequality in the Ugandan private sector. Chabot and Duyvendak’s transnational diffusion theory and Becker’s theory of economic discrimination formed the theoretical foundation for the study. The research questions dealt with the relationship between foreign direct investment and the percentage of female workers, the percentage of women in leadership positions, and the gender wage gap in …

Demographic Characteristics And Response Preparedness Of Employed Adults To Ebola Virus Disease In Monrovia, Liberia, Beth Ann Sexton

Walden Dissertations and Doctoral Studies

AbstractEbola virus disease (EVD) is a deadly disease with no known cure and it caused an outbreak from 2014-2016 in Western Africa. Liberia had the highest morbidity and mortality; its capital city, Monrovia, was the focus of this study. The purpose of this research was to explore the association between sociodemographic and socioeconomic factors (gender, religion, age, occupation, education, and ward) and the use of preventative hygiene measures and understanding of EVD among working Monrovian adults. This population was chosen because 97% of the Monrovian population is employed, and thus serves as a good source for future public health campaigns. …

Challenges To Successful Health Care Transition Among Hiv Positive Youth With Perinatal Acquisition, Tyler Andrew Termeer

Walden Dissertations and Doctoral Studies

To ensure stability in the continuum of health care for HIV-positive youth with perinatal acquisition, there is a need for a successful transition from pediatric to adult primary care. However, there are a growing number of perinatally infected HIV-positive young persons remaining in pediatric care beyond the age of 21. Using Mohr’s program theory and a phenomenological approach, the lived experiences of Ohio HIV clinicians were examined to determine why many perinatally infected HIV-positive youths are remaining in pediatric care beyond the age of 21. Audio recorded video interviews via SKYPE were conducted with 12 participants, transcribed, underwent thematic analysis, …

African American Women Teachers’ Motivation To Stay In The Profession, Cynthia Yvonne Adams

Walden Dissertations and Doctoral Studies

Teacher attrition contributes to teacher shortages in public school systems throughout the United States. Some teachers leave the profession because of low salary, job dissatisfaction, lack of administrative support, and infrequent professional autonomy. Researchers have focused on attrition from the perspective of why teachers leave the profession. However, in current literature little is known about what motivates teachers to remain in the profession, including their race and gender. The purpose of this study was to explore African American women middle school teachers’ motivation to stay in the profession. In this study, self-determination theory was used as the theoretical framework to …

Canadian Prosecutors’ Views On The Use Of Capital Punishment For Defined Terrorist Activity, Aswani Datt

Walden Dissertations and Doctoral Studies

In the post-9/11 world, Canada has struggled with developing a sentencing regime that effectively punishes and deters defined terrorist activity such as the attack on the Canadian Parliament, the Danforth shootings, the rise of Khalistani and Islamic terrorism, and the Toronto Van Attack. Broadly speaking, the Canadian public still supports capital punishment, but it is unclear whether Canadian prosecutors perceive and view the issue in the same light in their professional and legal capacity. Canadian prosecutors are tasked with seeking sentences that meet criminal justice principles, including the principle of deterrence. Their views on what punishments are just and effective …

Systematic Review Of The Barriers To Breastfeeding For Non-Hispanic Black Women, Ketty N. Floyd

Walden Dissertations and Doctoral Studies

Breastmilk provides the optimal food for newborns and contributes to improved lifelong health. A community hospital in the Eastern United States serving non-Hispanic Black (NHB) women has a breastfeeding exclusivity rate of only 8%, which is low compared to the state’s exclusivity rate of 40%. A systematic review of the literature was conducted to identify the breastfeeding barriers for NHB mothers and to identify strategies to address them. Guided by Fishbein and Yzer’s integrative model and the SQUIRE 2.0 knowledge reporting framework, 30 articles were appraised using Melnyk and Fineout-Overholt’s hierarchy of research and the Caldwell, Henshaw, and Taylor qualitative …

Strategies For Ethiopian Small Retailers Businesses To Succeed Beyond 3 Years, Samson Negash Gebrehiwot

Walden Dissertations and Doctoral Studies

In Ethiopia, some small retail business owners (SRBOs) embark on initiatives without adequate preparation, which results in a risk of failure within the first three years. Grounded in the conceptual frameworks of resource-based views, dynamic-capabilities views, and relational views, the purpose of this qualitative multiple case study was to explore strategies used by SRBOs leaders to survive and grow beyond three years. The participants were four SRBOs from Ethiopia who succeeded in business for more than three years. Data were collected from semistructured interviews, company documents, observations, notes from data sources and analyzed using Yin’s 5-step data analysis process. Six …

Retail Store Managers’ Emotional Intelligence And Employee Engagement, Amala Luncheon

Walden Dissertations and Doctoral Studies

Emotional intelligence is an essential trait for managers to possess to be effective and successful in organizations. Soft skills are becoming as crucial as making quotas. Scholarly literature lacks research on emotional intelligence and employee engagement in retail in St. Lucia. Engaged employees could stay motivated during adversity and help maintain an organization’s culture. The purpose of this exploratory case study was to examine how retail store managers in St. Lucia perceived their emotional intelligence influences employee engagement. The conceptual framework that grounded the study was emotional intelligence and employee engagement from an organizational performance perspective. The data collection process …

Effect Of Insecticide-Treated Nets On Anemia In Nigerian Children, Adamu Onu

Walden Dissertations and Doctoral Studies

Childhood anemia is a significant public health problem in Nigeria and frequently coexists with malaria. The mortality associated with malaria increases when anemia is present. Insecticide-treated nets (ITNs) are a cheap and effective malaria preventive measure that can provide a protective barrier from insects. There are conflicting results from several studies on the effect of ITNs on anemia in children, with fewer studies on the effect of ITNs on anemia in Nigerian children. This study aimed to measure the effect of ITN use on anemia among children aged 6–59 months in Nigeria. The social ecological model was used as the …