Digital Commons Network^™

Scalable Scientific Data Management On High-Performance Computing Systems, Zhenbo Qiao

Dissertations

As high-performance computing (HPC) is being scaled up to exascale to accommodate new modeling and simulation needs, I/O has continued to be a major bottleneck in the end-to-end scientific processes. To bridge the widening gap between compute and I/O, and enable data to be more efficiently stored and analyzed, simulation outputs need to be refactored, reduced, and appropriately mapped to storage tiers. Also, a major question that the community is striving to answer is how to co-design data storage and complex physics-rich analytics in a way that the time to knowledge can be minimized in post-processing. As HPC storage systems …

Hydrodynamic Characterization Of Laboratory And Production Equipment For Pharmaceutical Testing And Manufacturing Using Experimental And Computational Approaches, Chadakarn Sirasitthichoke

Dissertations

The hydrodynamics of process units used in pharmaceutical industry, i.e., the distribution of velocity profiles and shear stresses within the vessel, often controls the process performance, significantly affecting product quality. The hydrodynamics is strongly influenced by several factors such as the vessel shape, stirrer type, presence of internals and baffles, agitation intensity, and liquid properties. Most of these parameters can be varied by the process designers and the operators to achieve the desired process outcomes. The impact of the hydrodynamics on the process outcome can be profound in both large vessels (e.g., reactors) and smaller vessels (e.g., dissolution vessels), involving …

Dependent Censoring In Survival Analysis, Zhongcheng Lin

Dissertations

This dissertation mainly consists of two parts. In the first part, some properties of bivariate Archimedean Copulas formed by two time-to-event random variables are discussed under the setting of left censoring, where these two variables are subject to one left-censored independent variable respectively. Some distributional results for their joint cdf under different censoring patterns are presented. Those results are expected to be useful in both model fitting and checking procedures for Archimedean copula models with bivariate left-censored data. As an application of the theoretical results that are obtained, a moment estimator of the dependence parameter in Archimedean copula models is …

Electric-Field-Driven Processes In Multiphase Fluid Systems, Qian Lei

Dissertations

Advantages of using electric fields in miniaturized apparatuses for a wide range of applications are revealed by numerous experimental and theoretical studies over the last several decades as it offers a simple and efficient method for manipulation of multiphase fluid systems. This approach is considered to be especially beneficial for control of boiling processes and colloidal suspensions considered in the presented work.

Boiling. Today's trends for enhancing boiling heat transfer in terrestrial and space applications focus on removal of bubbles to prevent formation of a vapor layer over the surface at a high overheat. In contrast, this dissertation presents a …

Machine Learning And Computer Vision In Solar Physics, Haodi Jiang

Dissertations

In the recent decades, the difficult task of understanding and predicting violent solar eruptions and their terrestrial impacts has become a strategic national priority, as it affects the life of human beings, including communication, transportation, the power grid, national defense, space travel, and more. This dissertation explores new machine learning and computer vision techniques to tackle this difficult task. Specifically, the dissertation addresses four interrelated problems in solar physics: magnetic flux tracking, fibril tracing, Stokes inversion and vector magnetogram generation.

First, the dissertation presents a new deep learning method, named SolarUnet, to identify and track solar magnetic flux elements in …

The Role Of Microorganisms In Rare Earth Elements Bioaccumulation, Maedeh Soleimanifar

Dissertations

Rare earth elements (REE) are valuable raw materials in our modern life. Extensive REE application from electronic devices to medical instruments and wind turbines, and non-uniform distribution of these resources around the world, make them strategically and economically important for countries. Current REE physical and chemical mining and recycling methods could have negative environmental consequences, and biologically-mediated techniques could be applied to overcome this issue.

In this research, the first objective is to investigate the bioextraction of cerium oxide and neodymium oxide nanoparticles (REE-NP) by a pure culture Methylobacterium extorquens AM1 (ATCC®14718™). Results show that adding up to 1,000 ppm …

Design And Learning-Based Decoding Of Low-Density-Parity-Check Codes For Multiterminal Communication, Salman Habib

Dissertations

The field of information theory was initiated by Claude Shannon in 1948. According to his most notable work, data can be transmitted reliably over a noisy communication channel with high probability, as long as a suitable coding scheme is employed to protect the data from channel noise. Since then, coding theorists have made numerous attempts to design low-complexity error correcting schemes which achieve the Shannon limit.

In the 1960s, Robert Gallager introduced sparse graph-based low-density-parity-check (LDPC) codes which are practically suitable for various coding applications, mainly due to their low encoding and decoding complexity compared to classical codes (e.g., Reed-Muller …

Fluorescence Probes For Bioimaging: Synthesis, Photophysical Properties And Applications, Mehrun Nahar Uddin

Dissertations

Fluorescent probes are a vital tool in the study of cell imaging. There are many types of fluorescent probes ranging from inorganic and organic nanoparticles to organic molecules. When used judiciously, they can help provide essential information on cellular structure and function. The introduction of two-photon microscopy has expanded the need for new probes, in particular near-infrared (NIR) absorbing and emitting fluorescent probes. The photochemical and photophysical properties of NIR probes play a crucial role in their effectiveness in cell imaging by both conventional and two-photon excitation (2PE) microscopy. In this research, the synthesis, photophysical properties, and two-photon absorption (2PA) …

Bodipy Based Photodynamic Therapy And Potassium Probes, Xiangshan Liu

Dissertations

Boron dipyrromethene (BODIPY) has become more and more popular in photophysical and biological applications. BODIPY based fluorescence compounds have numerous advantage properties including low toxicity, high absorption extinction coefficients, high fluorescence quantum yields, sharp fluorescence emissions, and resistance to photobleaching. All the good properties lead to the wide applications of BODIPY based compounds. In this research, two different kinds of BODIPY are synthesized. Firstly, BDBrC containing carbazole and BODIPY core is synthesized. Cellular uptake research shows BDBrC can target on lysosome and singlet oxygen generation research result indicates that BDBrC can be used in photodynamic therapy. BDBrC also shows pH-sensitive …

Synthesis And Characterization Of Glycosaminoglycan Mimetic Variants For Cartilage Tissue Engineering Applications, Richard David Vincent Jr.

Dissertations

No abstract provided.

Washington State Community College Leaders: Perceptions Of The 2018 American Association Of Community Colleges Competencies For Community College Leaders, Teresa Mcdermott

Dissertations

Purpose: The two-fold purpose of this study was to understand how Washington state community college vice presidents, deans, and academic faculty members serve in leadership positions with the Washington Association of Community and Technical Colleges (WACTC) and the Faculty Association of Community and Technical Colleges (FACTC) rate the importance of the 2018 American Association of Community Colleges (AACC) Competencies for Community College Leaders, Third Edition and to compare the differences between the three groups’ views of the importance of the AACC competencies.

Methodology: A descriptive, non-experimental quantitative methodology was used for this study. The sample was 55 community college vice …

Exploring Factors Influencing The Transition Of Adult Students From Noncredit To Credit Community College Courses, Kevin Baker

Dissertations

Purpose: The purpose of this study was to explore and describe the factors that former Adult Basic Education (ABE) students perceived were important in their transition from noncredit courses to credit coursework offered at 2 community colleges in San Bernardino County and Riverside County, California, using Schlossberg’s (1984) transition theory and 4S system elements. A second purpose of this study was to determine which factors facilitated or hindered their transition from noncredit courses to credit coursework.

Methodology: This qualitative research study utilized a phenomenological approach to explore the transition experience of former ABE students. Semistructured interviews were used to discover …

A Sequential Explanatory Mixed Methods Study Of The Strategies That Chief Human Resources Officers Use To Create A Culture Of Inclusiveness, Tonia Watkins

Dissertations

Purpose: The purpose of this sequential, explanatory mixed methods study was to identify and describe the leadership strategies that exemplary chief human resources officers (CHROs) of K-12 school districts use to create an organizational culture of inclusiveness using Kennedy’s (2008) 5 leadership qualities of cultural differences.

Methodology: This research study utilized quantitative surveys and qualitative interviews of 13 exemplary CHROs in Riverside, San Bernardino, and Orange counties in Southern California to identify and describe the strategies used to create an organizational culture of inclusiveness according to Kennedy’s (2008) 5 qualities of cultural differences.

Findings: The findings of the study reveal …

A Comparison Of Two Debriefing Methods On Clinical Reasoning Outcomes, Learner Satisfaction With Debriefing And Reflection, Clinical Learning And Clinical Reasoning, And Psychological Safety Of Nurse Orientees In Simulation-Based Education, Lori A. Persico

Dissertations

Simulation-based education is a teaching method used successfully in military, aviation, and medical education; however, the evidence rarely indicates how debriefing affects the learners' experiences. Debriefing is an essential component of simulation-based education that fosters conceptual learning, critical thinking, and clinical reasoning. The purpose of this study was to compare the effects of two different debriefing methods on nurses' perceptions of psychological safety, satisfaction with development of clinical reasoning skills, and satisfaction with learning.

Development Of A Scale To Measure Nursing Presence, Carol Toliuszis Kostovich

Dissertations

The purpose of this study was to develop a scale designed to measure nursing presence and to subsequently examine the psychometric properties of the scale; to describe patients' perceptions of nursing presence; and to evaluate the relationship between nursing presence and patient satisfaction. A conceptual definition of nursing presence was operationalized into the 25-item Presence of Nursing Scale (PONS). The sample consisted of 330 acutely ill medical-surgical adult patients hospitalized in a Midwestern community hospital. Using a 5-point Likert scale, patients were asked to rate the frequency that the registered nurse displayed these 25 characteristics of nursing presence. Content validity …

Clinical Decision Making Of Rural Novice Nurses, Teresa J. Seright

Dissertations

The purpose of this study was to develop substantive theory regarding decision making by the novice nurse in a rural hospital setting. Interviews were guided by the following research questions: What cues were used by novice rural registered nurses in order to make clinical decisions? What were the sources of feedback which influenced subsequent decision making for processing of cues?

Effectiveness Of A Simulated Hospital Day With Undergraduate Student Nurses: A Comparative Descriptive Design, Melissa A. Wholeben

Dissertations

Currently, outside forces create blocks that affect the quality and quantity of clinical experiences for pre-licensure nursing students. These limitations create an environment in which entry-level nursing students enter the workforce without a solid foundation in nursing concepts or in exposure to situations that they might encounter. To counter this dilemma, the University of Texas at El Paso (UTEP) School of Nursing Center of Simulation created a simulation activity to allow participants an opportunity to immerse themselves in a simulated hospital environment while practicing skills to be used with future "real" patients. The purpose of this study is to determine …

The Lived Experience Of Lebanese Oncology Patients Receiving Palliative Care, Myrna A. A. Doumit

Dissertations

The purpose of this study was to uncover the lived experience of Lebanese oncology patients receiving palliative care. The study design was based on the Utrecht School of phenomenology based on the Dutch school of phenomenology. This study followed purposeful sampling in which ten participants six women and four men with a mean age of 54.4 years were selected. The proposed research was approved by the Institutional Review Boards at the American University of Beirut and Duquesne University. In-depth semi-structured interviews along with observation-field notes were used as the source for data collection. Data were analyzed using the hermeneutic phenomenological …

A Phenomenological Study Of Exemplary Charter School Executive Directors Leading From The Heart, Giovanna Arzaga

Dissertations

Purpose: The purpose of this phenomenological study was to describe how charter school executive directors lead from the heart using Mark Crowley’s 4 heart-led principles (building a highly engaged team, connecting on a personal level, maximizing employee potential and valuing and honoring achievements) to accomplish extraordinary results in their organizations.

Methodology: This study followed a qualitative phenomenological research study to describe the lived experiences of exemplary charter school directors. A sample of 8 charter school executive directors was selected from the target population that included Fresno, Ventura, Los Angeles, and Orange Counties in Central and Southern California. Each of the …

The Integration Of Art: A Multiple Case Study Of Science, Technology, Engineering, Art, And Math (Steam) Schools In Three Schools In Southern California, Reyna Esther Smith

Dissertations

Purpose: The purpose of this qualitative multi-case study was to describe and analyze how schools that implement a STEAM program include the arts in their integrated program. The study focused on 3 K-12 schools in Southern California that are located in the Antelope Valley high desert region of the state. This multi-case study analyzed an elementary school, a middle school, and a high school that are in different districts in the area.

Methodology: This multi-case study used qualitative data to analyze the research questions regarding art infusion in STEAM programs and teacher and leader perspectives. Drawing from interviews of teachers …

Factors Influencing Female Caregivers' Appraisals Of Their Preschoolers' Behaviors, Sallie Coke

Dissertations

Children with psychologically vulnerable caregivers may be at risk for being labeled as having behavior problems when typical behaviors are viewed by their caregivers as problematic. Research examining the accuracy of the caregivers' perceptions of children's behaviors is limited The purpose of this study was to use the Resiliency Model of Family Stress, Adjustment, and Adaptation to explore family and female caregiver factors associated with appraisals of children's behaviors, the extent to which these appraisals may be distorted and children's level of risk of having behavioral problems.

A cross-sectional, correlational design was used. Data were collected from female caregivers of …

New Nurses' Experiences In The Lateral Violence Zone: A Grounded Theory, Mary Lillian Hanks

Dissertations

The impact of lateral violence on nurses and the nursing profession contribute to the nursing shortage and has negative effects on patient care (Vessey, DeMarco, Gaffney, & Budin, 2009). According to the Center for American Nurses (CENTER, 2008), lateral violence and bullying are an everyday occurrence among health care professionals. Nurses must gain real world experiences to deliver quality, safe, and effective patient care (Benner, Surphen, Leonard, & Day, 2010). Unfortunately, there are experienced nurses who are unable or unwilling to help novice nurses transition into their new role. Impaired relationships among nurses can lead to absenteeism, medical errors, and …

Effects Of A Reminiscence Learning Experience On Registered Nurses' Attitudes Toward And Empathy With Older Adults, William J. Puentes

Dissertations

Negative attitudes toward older adults are endemic to the nursing profession, as well as society in general. With older adults accounting for an ever increasing proportion of health care services, it is imperative that nurse educators develop continuing education activities that have a positive impact on registered nurses' attitudes toward older adults. The purpose of this study was to evaluate the effects of participation in a reminiscence learning experience (RLE) on registered nurses' attitudes toward and empathy with older adults.

Perceptions Of Cardiac Self-Care Among Lebanese Patients And Their Family Caregivers, Nuhad Yazbik Dumit

Dissertations

In Lebanon cardiovascular diseases are the leading causes of mortality and morbidity. Assisting people to live with cardiac illness is a problem needing attention. Literature demonstrated significant association between effective self-care practices and secondary prevention of cardiac disease. However, adopting interventions effective in the West may yield different outcomes if not culturally sensitive. The purpose of this study was to explore perceptions of cardiac self-care among Lebanese patients and their family caregivers. The specific aims were to describe the cultural context of self-care in Lebanon, and to explore roles of cardiac patients and caregivers to enhance self-care practices.

Perinatal Corticosteroids: Latent Neurodevelopment Of The Preterm Infant, Isabell Biene Purdy

Dissertations

The purpose of this study was to evaluate potential relationships between perinatal dexamethasone treatment of premature infants and latent child development. Often, postnatal corticosteroid (PNS) is offered in the neonatal intensive care unit (NICU) to wean mechanical ventilation. Experts suggested minimizing PNS use after studies identified higher milligrams per kilogram (mg/kg) as a risk factor for adverse developmental outcomes. This study quantified fetal dexamethasone and cumulative perinatal dexamethasone by mg/kg exposure to accurately assess associations between steroid exposure and premature infant behavioral development.

Informing Effective Simulation Pedagogy In Nursing Simulation, Sherry L. Barnard

Dissertations

Simulation methods are now widely used in nursing education programs. Several studies have been conducted that examine the effect of simulation on student outcomes in learning (Alinier, Hunt, Gordon, & Harwood, 2006; Arnold, et al, 2009; Rosen, Salas, Silvestri, Wu, & Lazzara, 2008), however, little has been discovered regarding models of faculty support and guidance during simulation. The factors that influence student learning in the simulation experience suggest faculty be a guide by offering cueing and support before, during, and after the simulation process (Parsh, Roberts, & Green, 2010). It is also suggested that debriefing be non-judgmental and a time …

A Nationally Representative Survey Of Depression Symptoms Among Jordanian Adolescents: Associations With Depression Stigma, Depression Etiological Beliefs, And Likelihood To Seek Help For Depression, Latefa Ali Dardas

Dissertations

Arab adolescents are considered a particularly vulnerable population to depression. The substantial lack of mental health services and the stigma associated with mental illness on the one hand; and poverty, unemployment, and lack of reasonable hopes for a decent future in the context of corruption of regimes and perceived social injustice on the other, call for establishing committed and effective policies to tackle depression and its associated stigma among Arab adolescents at risk for or diagnosed with depression. However, there is a substantial lack of research that can inform the current profile of adolescent depression in the Arab region. We …

The Health-Related Quality Of Life Of Adults With Down Syndrome, Rebecca Jermyn Graves

Dissertations

The purpose of this study was to examine the health-related quality of life (HRQOL) and factors associated with the HRQOL of adults with Down syndrome (DS) as reported by adults with DS and their caregivers. The study was designed to compare measures of HRQOL, health problems, health risks, and health-care utilization of adults with DS based on self-report with those from caregiver-report and to explore associations between HRQOL and health problems, health risks, health-care utilization, adaptive behavior, and demographic characteristics.

Simulated Presence Use For Quality Of Life Maintenance And Reduction Of Symptoms Of Distress In Persons Living With Dementia In Long-Term Care, Erin E. Bush

Dissertations

Nursing home residents with dementia often have an array of neuropsychiatric symptoms, including dementia-related agitation. It is theorized that many of these agitation symptoms occur due to unmet psychosocial needs that could be met by the presence of a caring nursing staff member, family member, or friend.

The purpose of this study was to determine whether live simulated presence improves dementia-related agitation when offered, identify barriers and facilitators to simulated presence between caregivers and residents of long-term care during the COVID-19 pandemic, and to determine if live simulated presence by a caregiver delivered one-on-one improved quality of life in long-term …

Exploring Resilience In Exemplary Rural School Superintendents, Silas Gaussoin-Radcliffe

Dissertations

Purpose: The purpose of this exploratory phenomenological study was to identify and describe the strategies used by exemplary rural superintendents to maintain personal resiliency based on Everly, Strouse, and McCormack’s (2015) five factors of personal resilience (active optimism, decisive action, moral compass, relentless tenacity, and interpersonal support).

Methodology: This exploratory phenomenological study used purposeful criterion sampling and recommendations from the county superintendents in the identified geographic area. Each of the 8 identified exemplary rural superintendents was interviewed using an instrument aligned to the five factors of personal resilience and their definitions. The researcher collected rich qualitative interview data, that were …