Digital Commons Network^™

Development And Evaluation Of Cooperative Intersection Management Algorithm Under Connected Vehicles Environment, Slobodan Gutesa

Dissertations

Recent technological advancements in the automotive and transportation industry established a firm foundation for development and implementation of various automated and connected vehicle (C/AV) solutions around the globe. Wireless communication technologies such as the dedicated short-range communication (DSRC) protocol are enabling instantaneous information exchange between vehicles and infrastructure. Such information exchange produces tremendous benefits with the possibility to automate conventional traffic streams and enhance existing signal control strategies. While many promising studies in the area of signal control under connected vehicle (CV) environment have been introduced, they mainly offer solutions designed to operate a single isolated intersection or they require …

Numerical Simulations Of Thin Viscoelastic Films, Valeria Barra

Dissertations

This dissertation is developed in the field of Computational Fluid Dynamics (CFD) and it focuses on numerical simulations of the dynamics of thin viscoelastic films in different settings. The first part of this dissertation presents a novel computational investigation of thin viscoelastic films and drops, that are subject to the van der Waals interaction force, in two spatial dimensions. The liquid films are deposited on a flat solid substrate, that can have a zero or nonzero inclination with respect to the base. The equation that governs the interfacial dynamics of the thin films and drops is obtained within the long-wave …

Design, Analysis And Optimization Of Visible Light Communications Based Indoor Access Systems For Mobile And Internet Of Things Applications, Sihua Shao

Dissertations

Demands for indoor broadband wireless access services are expected to outstrip the spectrum capacity in the near-term "spectrum crunch". Deploying additional femtocells to address "spectrum crunch" is cost-inefficient due to the "backhaul challenge" and the exorbitant system maintenance. According to an Alcatel-Lucent report, most mobile Internet access traffic happens indoors. To alleviate the "spectrum crunch" and the "backhaul challenge" problems, visible light communication (VLC) emerges as an attractive candidate for indoor wireless access in the 5G architecture. In particular, VLC utilizes LED or fluorescent lamps to send out imperceptible flickering light that can be captured by a smart phone camera …

On Distributed Mobile Edge Computing, Xiang Sun

Dissertations

Mobile Cloud Computing (MCC) has been proposed to offload the workloads of mobile applications from mobile devices to the cloud in order to not only reduce energy consumption of mobile devices but also accelerate the execution of mobile applications. Owing to the long End-to-End (E2E) delay between mobile devices and the cloud, offloading the workloads of many interactive mobile applications to the cloud may not be suitable. That is, these mobile applications require a huge amount of computing resources to process their workloads as well as a low E2E delay between mobile devices and computing resources, which cannot be satisfied …

Assessing The Effectiveness Of Managed Lane Strategies For The Rapid Deployment Of Cooperative Adaptive Cruise Control Technology, Zijia Zhong

Dissertations

Connected and Automated Vehicle (C/AV) technologies are fast expanding in the transportation and automotive markets. One of the highly researched examples of C/AV technologies is the Cooperative Adaptive Cruise Control (CACC) system, which exploits various vehicular sensors and vehicle-to-vehicle communication to automate vehicular longitudinal control. The operational strategies and network-level impacts of CACC have not been thoroughly discussed, especially in near-term deployment scenarios where Market Penetration Rate (MPR) is relatively low. Therefore, this study aims to assess CACC's impacts with a combination of managed lane strategies to provide insights for CACC deployment. The proposed simulation framework incorporates 1) the Enhanced …

Instabilities In Nematic Liquid Crystal Films And Droplets, Michael-Angelo Y.-H. Lam

Dissertations

The dynamics of thin films of nematic liquid crystal (NLC) are studied. Nematic liquid crystals are a type of non-Newtonian fluid with anisotropic viscous effects (due to the shape of the molecules) and elasticity effects (due to interacting electrical dipole moments). Exploiting the small aspect ratio in the geometry of interest, a fourth-order non-linear partial differential equation is used to model the free surface of the thin films. Particular attention is paid to the interplay between the bulk elasticity and the preferred orientation (boundary condition) of NLC molecules at the two interfaces: the substrate and the free surface. This work …

Virtual Smarts - Optimizing The Coalescing Of People For Collective Action Within Urban Communities, Stephen Thomas Ricken

Dissertations

Despite the importance of individuals coming together for social group-activities (e.g., pick-up volleyball), the process by which such groups coalesce is poorly understood, and as a consequence is poorly supported by technology. This is despite the emergence of Event-Based Social Network (EBSN) technologies that are specifically designed to assist group coalescing for social activities. Existing theories focus on group development in terms of norms and types, rather than the processes involved in initial group coalescence. This dissertation addresses this gap in the literature through four studies focusing on understanding the coalescing process for interest-based group activities within urban environments and …

Fluorescent Probes And Functionalized Nanoparticles For Bioimaging: Synthesis, Photophysical Properties And Applications, Xinglei Liu

Dissertations

The development of new organic molecular probes with excellent photophysical properties and high fluorescence quantum yields is of considerable interest to many research areas including one- and two-photon fluorescence microscopy, fluorescence-based sensing methodologies, and cancer therapy. Series of organic linear-/non-linear optical molecules including squaraine derivatives, and fluorene derivatives as well as other bioconjugates are designed and synthesized during the doctoral study for the aim of ion detection (Chapter 5), photo dynamic therapy, and deep-tissue imaging (Chapter 4). These optical probes are capable of absorbing light in the near infrared (NIR) window and thus have deeper penetration and cause less photodamage …

Direct And Indirect Controls On Bee Community Composition, Caroline Marie Devan

Dissertations

Bees are important pollinators, critical for the continued survival of plants in both natural and agricultural ecosystems. Diverse bee communities have been shown to increase richness in plant communities and plant reproduction depends upon bee community richness. Yet there is growing concern that pollinators, especially bees, are declining globally. This dissertation focuses on evaluating the mechanisms responsible for bee community composition in order to promote bee conservation in natural systems and their restoration in human-dominated urban and agricultural landscapes.

Bee populations are impacted directly by three things: floral resources, nesting resources and risk, primarily from natural enemies. Bees are indirectly …

Kinetic Study Of Free Radical-Radical Reactions Of Combustion Importance At Elevated Pressures, Chao Yan

Dissertations

Combustion mechanisms consist of hundreds elementary reactions of free radicals and stable molecules. Radical-radical elementary reactions play important roles due to the high concentration in which free radicals are accumulated in combustion systems. Radical-radical reactions are typically multi-channel. Some of the channels might be of chain propagation or even chain branching nature, while other channels might be of chain termination nature. The relative importance of different channels is pressure dependent. Compared to radical-molecule reactions, radical-radical reactions are much less studied. This is due to the difficulties of well characterized quantitative production of radical species as well as due to the …

Structural Studies To Determine The Mechanisms Supporting Multiferroic And Ferroelectric Properties Of Complex Oxides, Han Zhang

Dissertations

Multiferroics are a class of materials which possess both magnetic and electrical polarization with possible coupling between them. They show promise to enable new sensors and data storage devices with novel features, such as the possibility of writing polarization bits with magnetic fields at low power. The coexisting magnetic and ferroelectric order parameters are usually weakly coupled, preventing practical use. The development and study of new classes of materials with large magnetoelectric couplings is of high importance. Understanding the structure of these materials is key to this effort.

As one class of these systems, the RX3(BO₃)₄ has …

High Performance Cloud Computing On Multicore Computers, Jianchen Shan

Dissertations

The cloud has become a major computing platform, with virtualization being a key to allow applications to run and share the resources in the cloud. A wide spectrum of applications need to process large amounts of data at high speeds in the cloud, e.g., analyzing customer data to find out purchase behavior, processing location data to determine geographical trends, or mining social media data to assess brand sentiment. To achieve high performance, these applications create and use multiple threads running on multicore processors. However, existing virtualization technology cannot support the efficient execution of such applications on virtual machines, making them …

Experiments And Multi-Field Modeling Of Inelastic Soft Materials, Shuolun Wang

Dissertations

Soft dielectrics are electrically-insulating elastomeric materials, which are capable of large deformation and electrical polarization, and are used as smart transducers for converting between mechanical and electrical energy. While much theoretical and computational modeling effort has gone into describing the ideal, time-independent behavior of these materials, viscoelasticity is a crucial component of the observed mechanical response and hence has a significant effect on electromechanical actuation. This thesis reports on a constitutive theory and numerical modeling capability for dielectric viscoelastomers, able to describe electromechanical coupling, large- deformations, large-stretch chain-locking, and a time-dependent mechanical response. This approach is calibrated to the widely-used …

Identifying Depression In Primary Care: An Evidence-Based Intervention, Mary Alice Peters

Dissertations

Identifying depression in primary care is an urgent concern locally and nationally. Due to lack of screening or inquiry by primary care providers, as well as an insufficient number of mental health professionals, depression remains under-detected. This problem has been identified locally as a result of a 2014 population health survey in Huron County, Ohio. The population reported multiple reasons for not seeking out a program or service within the county to address symptoms of depression, anxiety, or emotional problems. The 2016 recommendation by The United States Preventative Services Task Force is to screen the general public as long as …

Anti-Black School Policy Making: A Critical Policy Analysis Of The Wellston/Normandy Merger, Eric Higgins

Dissertations

This study explores the closing of Wellston School District as an act of contempt and oppression. This study looks at the history of the Wellston community and also examines many micro-aggressive acts of oppression. Also, examined and discussed will be the impact of economic disenfranchisement, demographic change, historical memory, and school funding and accountability. This study uncovered a counter-narrative that helps to usurp the prevailing master narrative and rhetoric surrounding the closing and subsequent merger of the Wellston School District with the Normandy School District.

This historical analysis will rely heavily upon the use of CRT to undergird the conceptual …

School Accountability And Equal Opportunity In Missouri, Bradley Ross

Dissertations

In Missouri, the Missouri School Improvement Plan, generation 5 (MSIP-5) attempts to boil down assessment, attendance, college and career readiness, and graduation rates into a single score (out of 100). Within MSIP-5, Black and Hispanic students are lumped into a super subgroup with English language learners, students in poverty, and students with disabilities. The aggregate of test scores for all in these groups provide the indicators for school success.

There are two concerns. First, the indicator for subgroup achievement is worth only one-fourth of the points that overall student achievement. In addition, while the highest levels of achievement require the …

The Association Of Kangaroo Mother Care, Energy Conservation, And Bonding In Preterm Neonates, Dorothy Forde

Dissertations

Purpose:To examine the association of kangaroo mother care (KMC) on energy utilization and bonding as evidenced by reduced biochemical markers of adenosine triphosphate (ATP) degradation, hypoxanthine (Hx), xanthine (Xa), and uric acid (UA), and (allantoin), a measure of oxidative stress in preterm infants 24-36 weeks gestation. A secondary objective was to compare specific physiological parameters using bedside monitoring and perfusion and oxygenation of the gut using near-infrared spectroscopy (NIRS) during 1 hour of KMC compared to incubator care.

Study design: A randomized controlled trial (RCT) examining the effects of 1-hour of KMC or 1-hour incubator care on urinary markers …

Oxygen Consumption In Sepsis, Julie Graham

Dissertations

Background: Sepsis is a life-threatening condition that can lead to septic shock and death. With over 300,000 annual cases (AHRQ, 2011) costing a staggering $1.5 billion (Health Care Utilization Project Brief #185), the importance of sepsis is becoming clear. However, some basic biological mechanisms are poorly understood. Study Purpose: This study investigated the relationships between select demographics, resting energy expenditure (REE), serum lactate, SOFA score mortality index, oxygen consumption [by way of measuring net oxygen consumed, (V02) and net carbon dioxide produced (VC02)], and sepsis. Specific Aims: Aims were to describe 1) patient demographics, serum lactate, SOFA score mortality index, …

Educating Boys In Jamaica: In Search Of A New Lens, Marcia Sharon-May Chin

Dissertations

The need for innovative solutions to enhance educational outcomes for Jamaican high school male students is evident. For over two decades, national exam results demonstrate that these students have consistently underachieved. Using aqualitative research design, this study explores the possibility of scaling up a student leadership educational model, developed by one U.S. school that has proven successful in educating an inner city minority male student population, to a similarly placed Jamaican high school. Focus groups and interviews were conducted with stakeholders at an all male Jamaican school and with administrators at the Ministry of Education, to understand their perceptions regarding …

Performance Feedback: How Structure, Culture, And Agency Affects Feedback, Angelica Sleiman

Dissertations

Federal and state mandates have placed an added pressure on teachers to demonstrate “effective” instructional practices. These mandates also affect the role of a principal, as an evaluator of “effective” instructional strategies, and as an instructional leader who continuously needs to build teacher capacity to satisfy these mandates. Accountability mandates promise to improve students’ academic performance but they have lacked professional development that would provide the support teachers and principals need to achieve success. Feedback is arguably a valuable mechanism to build teacher capacity and respond to accountability pressures, however, the implementation of feedback and its consequences for teacher’s professional …

African American Women Baccalaureate Success: A Reflective Look At Pre-Collegiate Years Influencing Transition, Persistence, And Degree Attainment, Leilah K. Kirkendoll

Dissertations

African American women are graduating from college at rates higher than their Asian/Pacific Islander, Latino, Native American and even their African American male peers. This level of college persistence and success is occurring amid the challenges they face and share with their peers of the same schools, neighborhoods and society. Similar to many of their peers, these young women experience under-resourced schools and limited college preparation. In addition, they have unique school challenges including experiences with negative stereotypes and harsh discipline policies. African American women also face societal challenges through experiences with trauma, foster care and disproportionate early parenting, to …

The Human Dynamics Needed In The Change Process For Transformational Implementation Of Educational Reform: Common Core State Standards, Daisy Morales

Dissertations

Purpose: The purpose of this study was to explore and describe the changes made in mindset, behaviors, culture, and systems as perceived by K-12 school district directors and principals in California in the implementation of the California Common Core State Standards (CCSS).

Methods: This study was descriptive and qualitative, conducted by interviewing 8 principals and 8 directors who have been in their positions for 3 or more years, had first-hand experience with the implementation of the California Common Core State Standards (CCSS), and were familiar with the shifts needed in CCSS. The interviews were recorded, transcribed, coded, and analyzed for …

A Profile Of Selected Conservatorships In Failing Mississippi School Districts, Josh Jones

Dissertations

The purpose of this study was to determine factors associated with the success of conservatorships as a method for school district improvement by analyzing school accountability ratings, results from an adaptive leadership instrument, and action plans of conservators. A sequential exploratory design was used to examine the action plans implemented by conservators to increase academic achievement in five failing school districts. The quantitative data from this study consisted of accountability ratings from districts under the control of a conservator within the 2012 – 2016 time period and data from the adaptive leadership questionnaire. This questionnaire was sent to administrators in …

African American Women: The Role Of Education, Spirituality, And Resilience In Their Transition From Poverty, Donna Scott

Dissertations

African American women born into impoverished families often have difficulty moving beyond their low socioeconomic circumstances (Cozarelli, Wilkinson, & Tagler, 2001). Although education has been shown to influence the lives of African American women, limited research has been conducted relative to the influence of education in their transition from poverty. Also, while there is considerable evidence regarding the authoritative role of spirituality in the lives of women, and for African American women in particular (Mattis, 2002), little research has focused on how African American women utilized spirituality as a source of strength in response to the challenges of poverty. The …

Theory Of Planned Behavior Applied To High School Science Teachers Implementing Next Generation Science Standards, Anna Pierce

Dissertations

The high demand for a scientifically literate society and workforce led to the creation of the Next Generation Science Standards (NGSS) and their release in April 2013. NGSS are based on a call to improve science education at the primary and secondary levels and emphasize the importance of a more conceptual and hands-on approach to science. The purpose of this mixed methods research study was to examine, through the use of Ajzen’s theory of planned behavior, the factors involved in teachers’ intentions to implement the NGSS in high school science courses. Semi-structured interviews were performed with nine teachers and experts …

A Case Study Evaluation Of The Implementation Of Twice-Exceptional Professional Development, Chin-Wen Lee

Dissertations

According to the 2014–2015 State of the States in Gifted Education, Colorado is the only state in the United States where a series of onsite, customized twice-exceptional professional development opportunities have been implemented. Yet, the Colorado Department of Education and its partner school districts have not systematically evaluated the impact of that two-year initiative. The purpose of this study was to understand the implementation of twice-exceptional professional development during 2014–2016 in a school district in Colorado. A case study design was used to better understand (a) educators’ perspectives about their training experiences and the educational services developed and/or implemented as …

Culturally Relevant Pedagogy: Teacher Experiences And Impact On Student Learning, Jessica Denton

Dissertations

Growing public concern about the educational experiences of English language learners (ELL) has placed pressure on teachers and schools to provide equitable learning opportunities for this group of students. Currently, federal and state mandates promise to hold all students to the same high expectations, but ELLs consistently underperform academically. Such research suggests that culturally relevant pedagogy (CRP), specifically the inclusion of culture in the classroom, as well as the integration of students’ lived experiences can influence students’ learning opportunities.

This study was guided by existing theories of culturally relevant pedagogy, “funds of knowledge,” social maturity and cognitive development theories as …

Exploring Pre-Service Special And General Education Teachers’ Beliefs And Attitudes In Mathematics And Learning And Teaching Mathematics, Bedoor A H E Alazemi

Dissertations

The purpose of this quantitative study was to examine and compare the beliefs and attitudes of pre-service special and general education teacher candidates regarding mathematics and the learning and teaching of mathematics and explore factors including student learning, teaching math, math rated affect (math anxiety and confidence), effectance motivation, usefulness of math, and the effect of previous teachers’ perceptions. The interrelationship among these factors was explored and compared to participants’ academic level and majors (i.e., special education and general) to determine whether these factors influenced the approaches pre-service teachers thought they would use when teaching math. The participants were 362 …

Physical Education Cooperating Teachers Participation And Beliefs As Teacher Educators, Hillary May Franks

Dissertations

Cooperating teachers (CTs) have consented “to assume one of the most responsible, influential, and exciting roles in teacher education” (Henry & Weber, 2010, p. 2); therefore, it is imperative for teacher preparation programs to prepare and support them for this role. No evidence suggests ways in which CTs, specifically physical education cooperating teachers (PECTs), either do or do not participate as teacher educators during the student teaching experience. Clarke, Triggs, and Neilsen (2014) identified 11 teacher educator roles CTs engage in and suggest further exploration into the ways in which CTs identify and participate in these roles. It is unclear …

The National Hockey League Totals Market: Efficiency, Profitability, And Heuristic Behaviors, Alexander Traugutt

Dissertations

The National Hockey League (NHL) totals market provides an optimal setting to test the theory of efficient markets. Under the notion of market efficiency, prices of an asset are reflexive of all publicly available information, making it impossible to enjoy consistent, above-average, returns. In contrast to the other major professional sporting leagues in North America, the NHL was the last to become fully integrated into sportsbooks, thus making it more susceptible to inefficiencies. To date, there has only been one published study related to the NHL totals market, which found deviations from market efficiency. The present research builds and expands …