Digital Commons Network^™

Study Of Current Optocoupler Techniques And Applications For Isolation Of Sensing And Control Signals In Dc-Dc Converters, Jake Williams

Graduate Theses and Dissertations

There is a need for power switches that can operate at high voltage, high temperature, and high switching frequencies with low losses. Power switches fabricated from wide bandgap materials such as silicon carbide (SiC) or gallium nitride (GaN) can outperform conventional silicon switches due to material property advantages. Another common problem in grid-connected applications is the need for high voltage-isolation of gate drivers and control circuitry while operating efficiently at the high switching frequencies, high power density, and high temperatures made possible by wide bandgap devices. Transformers cannot operate at the temperatures of these wide bandgap devices and a new …

Design And Analysis Of An Adaptive Asynchronous System Architecture For Energy Efficiency, Brent Michael Hollosi

Graduate Theses and Dissertations

Power has become a critical design parameter for digital CMOS integrated circuits. With performance still garnering much concern, a central idea has emerged: minimizing power consumption while maintaining performance. The use of dynamic voltage scaling (DVS) with parallelism has shown to be an effective way of saving power while maintaining performance. However, the potency of DVS and parallelism in traditional, clocked synchronous systems is limited because of the strict timing requirements such systems must comply with. Delay-insensitive (DI) asynchronous systems have the potential to benefit more from these techniques due to their flexible timing requirements and high modularity. This dissertation …

The Role Of Centromeric Chromatin And Kinetochore-Associated Factors In Chromosome Segregation, Wesley Williamson

Graduate Theses and Dissertations

Previous work in our lab has identified a point mutation in HTA1, one of the genes encoding histone H2A, which causes an increase-in-ploidy phenotype in Saccharomyces cerevisiae. This histone mutant strain was used to carry out a transposon insertion screen to identify suppressors of the increase-in-ploidy phenotype. This screen identified all three subunits of the Hda histone deacetylase complex, HDA1, HDA2, and HDA3. This study aims to elucidate the function of the Hda complex in chromosome segregation by exploring interactions among the members of the complex, as well as interactions between Hda complex and kinetochore components. …

The Lived Experience Of The Parents Of High School Dropouts: A Phenomenological Study, Christine Ann Silano

Graduate Theses and Dissertations

The purpose of this study is to describe the experiences and perceptions of parents whose children did not receive a high school diploma. This subpopulation has been rarely studied. The central question is, "What are the perceptions and experiences of the parents of public high school dropouts as they pertain to schools, their children, and themselves?"

This phenomenological study examined the lived experience of the parents of high school dropouts. Five women and one man participated in the study by sitting for interviews. The collected interview data was transcribed and analyzed using qualitative methodology including open and axial coding as …

Protecting The Hand: .Quantifying Pressures Involved In Daily Living Activities With Tools, Kelly Cotter, Trisha Thompson, Amanda Ward

Hand and Upper Extremity

This study utilized individuals with no known hand joint pathologies and analyzed the pressure exerted on varying spoon handle diameters during a simulated self-feeding exercise. This was done in an effort to determine which spoon handle diameter required the least amount of pressme. Individuals with no known hand joint pathologies were selected in order to prevent any inaccuracy of results due to underlying co-morbidities. Methods: The Novel Pliance-X hand sensor was wrapped around 15 mm, 25 IDDl, and 40 mm spoon handles. The participants were asked to complete a self-feeding exercise. The self-feeding exercise was simulated by scooping quarters from …

Effects Of Computer Assisted Tier Ii Interventions By Gender On Math And Reading Achievement For Remediated Students, Kathi (Lutz) Sweere

College of Education Dissertations

Response to Intervention (RtI) is a current reform initiative being examined by educators, politicians, and proponents of differentiated education. RtI has tiers of intervention designed to meet the various academic needs of all students. RtI has been developed as an educational methodology to increase student achievement through various problem-solving techniques, through the implementation of specific interventions based on each student’s individual needs, and through data-based decision making regarding the interventions used. The implementation of RtI requires schools to shift current educational paradigms of how services are delivered to students.

This quantitative causal comparative study compared the effectiveness of PLATO alone, …

Finding Unpredictable Behaviors Of Periodic Bouncing For Forced Nonlinear Spring Systems When Oscillating Time Is Large, Yanyue Ning

Honors Scholar Theses

The model of nonlinear spring systems can be applied to deal with different aspect of mechanical problems, such as oscillations in periodic flexing in bridges and ships. The concentration of this research is the bouncing behaviors of nonlinear spring system when the processing time is large, therefore nonlinear ordinary differential equations (ODE) are suitable since researchers can add different variables into the models and solve them by computational methods. Benefit from this, it is easy to check the oscillations or bouncing behaviors that each variable contributes to the model and find the relationship between some important factors: vibrating frequency, external …

Development Of Core Body Temperature (Cbt) And Heart Rate Wearable Device, Brenna Carbone, Madison Castellanos, Jonathan Chen, Jenna Wagner

Intersections Fall 2020

Hyperthermia is a condition when the body's heat-regulation system is overwhelmed and a person's core body temperature (CBT) is above 100.4°F (38°C). This is a major risk among athletes and occupational workers in the military, construction, manufacturing, and emergency response who engage in intense physical activity. Currently the gold standard to measure CBT is through a rectal thermometer. While rectal thermometers are accurate, they are quite invasive and do not provide a way for continuous monitoring. Other skin and oral thermometers which are considered noninvasive are not accurate because they only measure surface temperature and are easily influenced by other …

Empathy Maps Of The Foursight Preferences, Hanne M. Bratsberg

Creativity and Change Leadership Graduate Student Master's Projects

Empathy Maps of the FourSight Preferences

The purpose of this project is to make one empathy map for each of the FourSight preferences. The goal of the project is to add a visual representation of the four main preferences to the growing body of data of FourSight. Individuals who are interested in FourSight, both for personal and professional reasons, can use the empathy maps to form a deeper understanding of each preference.

Human Centered Design Approach To Mentoring, Jennifer Lynn Potratz

Creativity and Change Leadership Graduate Student Master's Projects

Design Thinking is quickly changing from a model of designing products to becoming known for human centered design. This change has occurred with the work of companies like IDEO, who strive to bring about change to non-profits in socially innovative ways. With this knowledge, more people are utilizing Design Thinking in new and challenging ways. This project serves to use Design Thinking and human centered design to assist in the ongoing challenge of youth who age out of the foster care system by creating a lesson plan to teach foster care and adoption agencies effective ways to recruit mentors and …

Turkish Housing Policies : A Case Study On Mass Housing Provision In The Last Decade., Salih Ozgur Sarica 1983-

Electronic Theses and Dissertations

Most industrial countries face with some form of housing problems. As a result, each state has adopted a variety of housing policies. Policy methods of government authorities in meeting the housing gap and addressing the low income families' housing needs differ from one country to another. In Turkey, the housing policies have not been effective to respond the housing needs of low- and middle-income families until the recent decades. Turkish Mass Housing Administration (TOKI), which was established in 1984, accelerated its mass housing provision in recent years. Through law amendments and administrative reforms in 2003 and 2004, TOKi as a …

Associations Between Self-Esteem And The Forms And Functions Of Aggression In A Community Sample Of Youth, Miklós Balázs Halmos

Senior Honors Theses

The purpose of the current study is to examine the association between self-esteem and the forms and functions of aggression. Research supports the existence of four aggressive subtypes (i.e., reactive overt, reactive relational, proactive overt, and proactive relational), and past research has found associations between aggression and self-esteem. However, past studies have not examined the relationships between all four subtypes of aggression and self-esteem together. 141 adolescents were recruited from the community with a mean age of 13.55. The sampled group was composed of 51% females and 52% Caucasians. Participants completed self-report questionnaires on self-esteem and aggression. The results provide …

Safe: Simulation Automation Framework For Experiments, Luiz Felipe Perrone, Bryan C. Ward, Christopher S. Main

Faculty Journal Articles

The workflow of a network simulation study requires adherence to best practices in methodology so that results are credible and reproducible by third parties. The opportunities for one to introduce errors start at model description and permeate the process through to the reporting of results. The literature indicates that even publications in respected venues include inadvertent mistakes and poor application of methodology. When experts are liable to fail, it is unreasonable to expect that students would fare any better. This paper presents a system designed to provide guidance for inexperienced users of the popular ns-3 network simulator. SAFE automates the …

Multivalent Random Walkers:A Computational Model Of Superdiffusive Transport At The Nanoscale, Mark Joseph Olah

Computer Science ETDs

We present a stochastic model and numerical simulation framework for a synthetic nanoscale walker that can be used to transport materials and information at superdiffusive rates in artificial molecular systems. Our \emph{multivalent random walker} model describes the motion of a walker with a rigid, inert body and flexible, enzymatic legs. A leg can bind to and irreversibly modify surface-bound chemical substrate sites arranged as nanoscale tracks. As the legs attach to, modify, and detach from the sites, the walker moves along these tracks. Walkers are symmetrical and the tracks they walk on are unoriented, yet we show that under appropriate …

"Leadership Is Behaving And Acting Like A Leader": A Narrative Exploration Of The Life Stories Of Three Latino Leaders In Healthcare, Kevin L. Flores

Department of Agricultural Leadership, Education, and Communication: Dissertations, Theses, and Student Research

There is a dearth of Latino leaders holding executive positions in healthcare. The purpose of this study was to provide a privileged platform for the voice of Latino leaders in healthcare who, by definition, emanated from a marginalized population. This study began with the assumption that the stories of Latino leaders were different than leaders of the majority population due to their ethnicity. Latino critical theory asserts that concepts like leadership need to be viewed through an ethnic lens. The overarching question that guided this study was: What do the stories of three Latino leaders reveal about their development as …

Which Study Method Works Best? A Comparison Of Soar And Sq3r For Text Learning, Sarah C. Kasson

College of Education and Human Sciences: Dissertations, Theses, and Student Research

One hundred thirty-eight college students participated in a study comparing the SOAR (Select, Organize, Association, Regulate) and SQ3R (Survey, Question, Read, Recite, Review) study systems to each other and to students’ preferred study methods. Though both systems have been researched independently, just one other study has compared these study systems to each other. College students were assigned randomly to one cell of a 2x2 factorial design (method: SOAR or SQ3R; material: supplement or no supplement) or to a preferred-study-method control group. Groups were trained in their respective system (SOAR, SQ3R, or control) and then given materials about educational measurement to …

Making Room For Formative Assessment Processes: A Multiple Case Study, Rob Mcentarffer

College of Education and Human Sciences: Dissertations, Theses, and Student Research

This qualitative instrumental multiple case study (Stake, 2005) explored how teachers made room for formative assessment processes in their classrooms, and how thinking about assessment changed during those formative assessment experiences. Data were gathered from six teachers over three months and included teacher interviews, student interviews, participant-observation notes, videos of classroom experiences, and classroom artifacts. These data were analyzed using a category construction method (Merriam, 2009) that involved open coding, axial coding, and finally a cross-case analysis that grouped axial codes according to themes relating to the two research questions. Four case studies describe the process of co-created work with …

Processing Facial Emotions: An Eeg Study Of The Differences Between Conservatives And Liberals And Across Political Participation, Karl Evan Giuseffi

Department of Political Science: Dissertations, Theses, and Student Research

Behavioral differences have been reported between conservatives and liberals when categorizing facial expressions, yet no study explores potential differences in the manner in which the two groups process facial expressions, let alone how partisanship contributes or how political engagement may vary with brain processing of facial expressions. In this context, processing refers to brain patterns following exposure to a facial expression and participants’ subsequent attention to the presented facial expressions. This thesis addresses the question of whether political temperament is associated with differences in neural processing. Research subjects participated in an emotion discrimination task while event-related potentials (ERP) were captured …

Understanding Africa’S China Policy: A Test Of Dependency Theory And A Study Of African Motivations In Increasing Engagement With China, Nkemjika E. Kalu

Department of Political Science: Dissertations, Theses, and Student Research

African states are increasingly engaging with China--politically, socially and economically--especially through the machinations of the Forum for China-Africa Cooperation (FOCAC). This dissertation asserts that Africans are willing partners of the Chinese, motivated by their state-centric belief that engagement with China is in their national interest. This assertion contradicts the assumption of most literature to date that appears to borrow from the logic of dependency theory and presents African nations as pawns, subject to the demands of a dominant and exploitative China, who is benefiting at Africa’s expense. Economic trends from the decade before the launch of the FOCAC and the …

Morphometric, Biochemical, And Raman Spctral Analyses Of Muscle Damage In Patients With Peripheral Arterial Disease: Provising Objective Criteria For Diagnosis And Treatment Monitoring, Kim Cluff

Department of Agricultural and Biological Systems Engineering: Dissertations, Theses, and Student Research

Peripheral arterial disease (PAD), which affects approximately 10 million Americans, is characterized by atherosclerosis of the non-coronary arteries. PAD produces a progressive accumulation of ischemic injury to the limbs that is reflected in a gradual worsening in the myofiber morphology and oxidative damage in the gastrocnemius muscle. In this study, we evaluated the hypothesis that quantitative morphological and biochemical parameters of gastrocnemius myofibers change in a consistent manner during the progression of PAD, provide an objective grading of muscle degeneration in the ischemic limb, and correlate to clinical stage of PAD. Myofiber morphometrics were determined precisely with mathematical equations that …

Assessing Local And Landscape Constraints On Habitat Management For Grassland And Upland Birds, Christopher F. Jorgensen

School of Natural Resources: Dissertations, Theses, and Student Research

Species-habitat relationships are a central tenant to ecological theory and are critical in species management. Yet, despite a long-standing tradition of utilizing species-habitat relationships in both theoretical and applied ecology, there remains to be no clear predictors of how species relate to habitat. In order to further our understanding of the habitat selection process, we must begin to comprehend what spatial scales species form habitat decisions and what potential behavioral or life-history predictors underlie the scale of habitat decisions. During 2010-2012, I conducted point counts for grassland birds across Nebraska and assessed habitat relationships over multiple spatial scales to construct …

Population Characteristics, Development Of A Predictive Population Viability Model, And Catch Dynamics For Pallid Sturgeon In The Lower Missouri River, Kirk D. Steffensen

School of Natural Resources: Dissertations, Theses, and Student Research

Population characteristics and long-term population trends of pallid sturgeon Scaphirhynchus albus in the lower Missouri River are relatively unknown. As recovery efforts continue, understanding and quantifying these characteristics and trends are critical for species recovery and future management decisions. Therefore, the objectives of this study were to determine the pallid sturgeon population characteristics, predict changes to the pallid sturgeon population based on different management and life history scenarios, and examine trot line catch dynamics in the lower Missouri River. Catch rates for pallid sturgeon collected with gill nets did not significantly change while catch rates using trot lines significantly declined …

Ecology And Invasive Properties Of Musk Thistle (Carduus Nutans) In The Central Prairies Of Nebraska, Chengchou Han

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Musk thistle (Carduus nutans) is an herbaceous monocarpic herb introduced to the U. S. from Eurasia. The invasion of musk thistle can reduce forage area, soil stability, and reduce recreation and open areas for humans and wildlife.

Resistance of warm season and cool season perennial grass communities to musk thistle invasion is important for land managers to consider, especially where disturbance has made an area particularly susceptible. Our results show that disturbances, such as overgrazing can open up niches in canopies of warm season grass communities and facilitate invasion but not in cool season grass communities. The mechanism …

The Impact Of Islam On Women In The Middle East A Discussion Of The Political Role Of Islam In Turkey, Saudi Arabia, And Lebanon, Elise Barimo

HIM 1990-2015

The social instability of the Middle East is often assumed to be consequential predominantly from the influences of extreme traditional Islamic practices; with substantial prominence placed upon the treatment of and violence against Middle Eastern women. This discussion seeks to directly prove the prevalence of Islamic influence on Middle Eastern politics and the resulting social instability. This assessment is designed around an interdisciplinary examination of coalescent factors. By assessing the political history, social and cultural lifestyle, and political and legal situation of the region, the assessment examines the contributors to the social instability of Saudi Arabia, Lebanon, and Turkey. The …

Women's Rights In Iran During The Years Of The Shah, Ayatollah Khomeini, And Khamenei, Andrea De La Camara

HIM 1990-2015

Women's rights have been a historically controversial issue. This is no exception in Iran, where the struggle between modernization and keeping with traditional Islamic values has been a topic of constant disagreement between political leaders. Women in Iran have experienced many changes in their personal rights and freedoms throughout the decades. This research focuses on religion and culture, the policies of the main leaders of Iran in the past decades, and the role of non-governmental organizations as factors that expand or limit the rights and freedoms of women. It attempts to identify which factor is mostly responsible for the position …

The Influence Of Beliefs On People's Perception Of Illness In The Spanish Golden Age, Nicole Cruz

HIM 1990-2015

Medicine is a field of science that is always changing and promoting new ideas and innovations. Throughout history, medicine has been an important factor in the lives of people around the world since the beginning of civilizations. This study focused on the literature of medicine as it relates to the Spanish Golden Age period. By looking at the history and critical studies in medicine during sixteenth and seventeenth century Spain as well as during the pre-colonial period in America, this thesis overviews the effects and influences in regards to health and illness in Spain and the Americas during the Spanish …

Optimal Investment Strategies Using Multi-Property Commercial Real Estate Analysis Of Pre/Post Housing Bubble, Kyle Kundiger

HIM 1990-2015

This paper analyzes theperformance of five commercial real estate property types (office, retail, industrial, apartment, and hotel) between 2000 and 2012 to determine the U.S. housing crisis'simpact on Real Estate investing. Under the concept of Modern Portfolio Theory, the data was analyzed using investment analysis programs to determine correlation, risk/return characteristics, and trade-offs (Sharpe ratio) as well as the optimal allocation among the individual property types. In light of the results, each property type plays a different role in investment strategies in various economic cycles. Some assets are attractive solely based onpotential return, or risk for return tradeoffs; however, through …

The Constitutionality Of The Occupy Movement, Yoe Lopez

HIM 1990-2015

The Occupy movement has spread over hundreds of cities nationwide and over 1,500 cities around the world. The movement is formed around a common goal, which is to protest the way government actions or inactions have rooted widespread discontent. The Occupy movement has encountered opposition from the cities and counties where it is located. Arrests have been made for a number of violations of city and county codes including resistance to police orders and disorderly conduct charges. In our country, freedom of speech and the right to protest have been regarded as inalienable rights. The question becomes how to balance …

Art As A Questioning Process, Elizabeth Perez

HIM 1990-2015

The topic of this thesis is, broadly, the crisis of postmodernity and the solution that French rhetorician, Michel Meyer, presents in his theory “problematology.” Meyer looks to relocate the focus of philosophical attention on the question as opposed to the answer. Meyer calls preoccupation with answers “propositionalism.” Propositionalism can be likened to the looming scientism that threatens philosophy in general. Meyer shows, through an examination of questioning, how philosophy can be rescued from obsolescence without being detracted to scientism. Although Meyer’s philosophy is promising, it could not be considered thorough if it did not address art. Using Gilles Deleuze and …

Examining The Power Of Using Primary Sources In Middle School Social Studies, Emily Richardson

HIM 1990-2015

Educational experts believe that utilizing primary sources opens new doors for students by allowing them to think like historians, which ultimately hones in on the purpose of developing critical thinking skills (Rodeheaver, 2009). Historians constantly question documents, events, and credentials in order to form their own opinions while using primary source documents (Drake, 2002). When students have the opportunity and freedom to question documents and events and form their own opinions, learning may be enhanced. This study examines the possible power of allowing students to explore primary documents and learn by doing during social studies instruction (Dewey, 1916). This thesis …