Digital Commons Network^™

Towards Practicalization Of Blockchain-Based Decentralized Applications, Songlin He

Dissertations

Blockchain can be defined as an immutable ledger for recording transactions, maintained in a distributed network of mutually untrusting peers. Blockchain technology has been widely applied to various fields beyond its initial usage of cryptocurrency. However, blockchain itself is insufficient to meet all the desired security or efficiency requirements for diversified application scenarios. This dissertation focuses on two core functionalities that blockchain provides, i.e., robust storage and reliable computation. Three concrete application scenarios including Internet of Things (IoT), cybersecurity management (CSM), and peer-to-peer (P2P) content delivery network (CDN) are utilized to elaborate the general design principles for these two main …

Understanding The Interfacial Processes Of Reactive Nanobubbles Toward Agricultural Applications, Xiaonan Shi

Dissertations

There is a growing interest in nanobubble (NB) technology because of its diverse applications (e.g., detergent-free cleaning, water aeration, ultra-sound imaging and intracellular drug delivery, and mineral processing). NBs have a higher efficiency of mass transfer compared to bulk scale bubbles due to the high specific surface areas. The high specific surface also facilitates physical adsorption and chemical reactions in the gas liquid interface. Furthermore, the collapse of NBs creates shock waves and the formation of hydroxyl radicals (OH).

However, it remains elusive why or how NBs are stabilized in water and particularly, the states of internal pressures of NBs …

Representation Learning In Finance, Ajim Uddin

Dissertations

Finance studies often employ heterogeneous datasets from different sources with different structures and frequencies. Some data are noisy, sparse, and unbalanced with missing values; some are unstructured, containing text or networks. Traditional techniques often struggle to combine and effectively extract information from these datasets. This work explores representation learning as a proven machine learning technique in learning informative embedding from complex, noisy, and dynamic financial data. This dissertation proposes novel factorization algorithms and network modeling techniques to learn the local and global representation of data in two specific financial applications: analysts’ earnings forecasts and asset pricing.

Financial analysts’ earnings forecast …

Outdoor Operations Of Multiple Quadrotors In Windy Environment, Deepan Lobo

Dissertations

Coordinated multiple small unmanned aerial vehicles (sUAVs) offer several advantages over a single sUAV platform. These advantages include improved task efficiency, reduced task completion time, improved fault tolerance, and higher task flexibility. However, their deployment in an outdoor environment is challenging due to the presence of wind gusts. The coordinated motion of a multi-sUAV system in the presence of wind disturbances is a challenging problem when considering collision avoidance (safety), scalability, and communication connectivity. Performing wind-agnostic motion planning for sUAVs may produce a sizeable cross-track error if the wind on the planned route leads to actuator saturation. In a multi-sUAV …

Design And Control Of Next-Generation Uavs For Effectively Interacting With Environments, Caiwu Ding

Dissertations

In this dissertation, the design and control of a novel multirotor for aerial manipulation is studied, with the aim of endowing the aerial vehicle with more degrees of freedom of motion and stability when interacting with the environments. Firstly, it presents an energy-efficient adaptive robust tracking control method for a class of fully actuated, thrust vectoring unmanned aerial vehicles (UAVs) with parametric uncertainties including unknown moment of inertia, mass and center of mass, which would occur in aerial maneuvering and manipulation. The effectiveness of this method is demonstrated through simulation. Secondly, a humanoid robot arm is adopted to serve as …

Towards A Cross-Layer Coupled Design Framework For Big Data Workflows, Qianwen Ye

Dissertations

The processing and analysis of big data increasingly rely on workflow technologies for knowledge discovery and scientific innovation. The execution of such workflows goes far beyond the capability and capacity of single computers and is now commonly supported on reliable and scalable data storage and analysis platforms in distributed environments, such as the Hadoop ecosystem. Workflow performance largely depends on how big data systems are configured and used. For example, the makespan of a big data workflow is affected by multiple layers of big data systems, including the parallel computing engine it runs on, the resource manager that orchestrates various …

Assessing Structural And Functional Brain Alterations And Work-Related Fatigue In Non-Hyposmic And Hyposmic Covid-19 Survivors, Rakibul Hafiz

Dissertations

In the year 2019, life began to change at the advent of a global pandemic caused by the novel coronavirus. Mask mandates and mass vaccinations have mitigated the effects significantly, yet cases keep rising with new variants, especially, in densely populated countries, like India. Recent neuroimaging evidence shows the virus can attack the central nervous system (CNS). However, exactly which brain regions undergo structural and functional changes remain largely unknown. Many patients experience 'loss of/reduced sense of smell' (i.e., hyposmic) and an alarming number of survivors develop persistent symptoms ('long-COVID') for several months after initial infection. Fatigue is the most …

Graph Enabled Cross-Domain Knowledge Transfer, Shibo Yao

Dissertations

The world has never been more connected, led by the information technology revolution in the past decades that has fundamentally changed the way people interact with each other using social networks. Consequently, enormous human activity data are collected from the business world and machine learning techniques are widely adopted to aid our decision processes. Despite of the success of machine learning in various application scenarios, there are still many questions that need to be well answered, such as optimizing machine learning outcomes when desired knowledge cannot be extracted from the available data. This naturally drives us to ponder if one …

Private Information Retrieval And Function Computation For Noncolluding Coded Databases, Sarah A. Obead

Dissertations

The rapid development of information and communication technologies has motivated many data-centric paradigms such as big data and cloud computing. The resulting paradigmatic shift to cloud/network-centric applications and the accessibility of information over public networking platforms has brought information privacy to the focal point of current research challenges. Motivated by the emerging privacy concerns, the problem of private information retrieval (PIR), a standard problem of information privacy that originated in theoretical computer science, has recently attracted much attention in the information theory and coding communities. The goal of PIR is to allow a user to download a message from a …

Bodipy-Based Light-Responsive Materials, Zhaoxiong Wan

Dissertations

The energy required for life on our planet is provided by light. In science, light is an important and powerful tool for measuring and modifying substances. For example, under the effect of illumination, light-responsive materials can change their physical and chemical properties. Photochemistry is a branch of research to study the effects of light irradiation on chemical structures and reactions. Some photochemical changes could lead to chemical bond dissociation (such as in photosynthesis) and structure isomerization (such as in the retina). Photochemistry has a strong relationship with human lives and it is essential in many ways. Among photophysics, fluorescence emission …

Type I Error Rate Controlling Procedures For Multiple Hypotheses Testing, Beibei Li

Dissertations

This dissertation addresses several different but related topics arising in the field of multiple testing, including weighted procedures and graphical approaches for controlling the familywise error rate (FWER), and stepwise procedures with control of the false discovery rate (FDR) for discrete data. It consists of three major parts.

The first part investigates weighted procedures for controlling the FWER. In many statistical applications, hypotheses may be differentially weighted according to their different importance. Many weighted multiple testing procedures (wMTPs) have been developed for controlling the FWER. Among these procedures, two weighted Holm procedures are commonly used in practice: one is based …

Design Of Self-Assembled Peptides For Wound Healing, Ka-Kyung Kim

Dissertations

According to the CDC, 15% of diabetic patients develop diabetic foot ulcers (DFU) and approximately 170,000 patients undergo non-traumatic amputation annually. DFU is a major complication of diabetes caused by non-healing full-thickness wounds through the dermis. The current treatments include blood sugar control, frequent debridement, offloading, moist wound care, infection treatment, and amputation. To achieve wound closure of DFU, appropriate wound care and antibiotic therapy are essential. Topical regimens include hydrocolloids, alginates, foam, silver-impregnated dressings, and hydrogels. Wound healing is a complex and dynamic interplay between the immune system, keratinocytes, and dermal cells (in case of cutaneous wound). Angiogenesis has …

Experimental And Theoretical Studies Of Flows Driven By Soluto- And Thermo-Capillary Forces, Islam Benouaguef

Dissertations

This dissertation aims to study the flow induced in a water body due to the presence of a solute or heat source on its surface. The flow arises because of a change in the local solute concentration or the temperature, which modify the local surface tension, giving rise to a surface tension gradient that drives the flow. These surface tension-driven flows are referred to as Marangoni flows. The following three induced-flows are investigated experimentally and theoretically: (i) Flow induced by a solute source present on a waterbody; (ii) Flow induced due to the impingement of a freshwater drop on a …

Optimization Of Polyhydroxyalkanoates (Phas) Bioplastic Production From Wastewater Activated Sludge, Bo Deng

Dissertations

Polyhydroxyalkanoate (PHA) is a biopolymer which has similar properties as fossil-fuel based plastic but also has capacity to biodegrade completely in the environment condition. This project aims to optimize the process to produce bioplastic PHA using activated sludge from wastewater. Specifically, five major research objectives are explored: (i) develop a quantification method of PHA by using Fourier-transform infrared spectroscopy (FTIR)F; (ii) improve the PHA production from mixed microbial cultures (MMC) by optimizing MMC; (iii) simulate the PHA production by using wastewater; (iv) evaluate the application of enzyme (alpha-amylase) in PHA production process; (v) market the investigation of wastewater produced PHA. …

Synthesis Of Polynitrogen With Radio Frequency Plasma, Haizheng Zhuang

Dissertations

Cubic gauche polynitrogen (cgPN) has been very attractive due to its high energy density that is 2.5 times higher than that of TNT. In the literature, cgPN has been investigated theoretically in detail, but few experimental works have been reported. In 2004, cgPN was first synthesized from nitrogen gas under extremely high temperature and high pressure (HTHP) conditions and the trace amount of cgPN in the high-pressure vessel decomposed once the pressure was released. Until recently, our group was the first to synthesize cgPN from NaN₃ precursor under ambient conditions with radio frequency (RF) plasma. In this study, the …

Unconscious Bias In United States Marine Corps Leadership Doctrine: Examining Microaggressions Through Document Analysis, Patrick Butler

Dissertations

This dissertation employed a document analysis format to examine Marine Corps leadership education doctrine for microaggressions. The United States Marine Corps (Marine Corps or USMC) is the military service with the least diverse officer cadre in terms of sex, gender identity, and race. The study results show a pattern of repeating unconscious bias-related content within the Marine Corps’ documents. Such patterns can negatively affect minority members in terms of their health, acceptance, and performance within the organization. The results also document an overriding bias-culture which puts Marine Corps leadership in a dilemma of trying to encourage conformity to traditional organizational …

Correlates Of Health Literacy And Perceptions Of Burden Among Caregivers Of Persons Diagnosed With Chronic Illnesses, Mubarak Aldawsare

Dissertations

Background/Rationale: Greater attention is needed on factors effectively supporting caregivers because poor well-being of caregivers can hamper overall patient outcomes. Lack of awareness of caregiver burden has implications for healthcare systems globally. Caregivers may encounter various levels of burden as a result of providing long-term care to individuals diagnosed with one or more chronic illnesses. Caregivers with inadequate health literacy are more likely to experience feelings of uncertainty, and as a result, caregiver burden. Little is known about the impact of the health literacy of caregivers on the level of burden when providing care to individuals with complex care …

Academic Trajectories Of Students With Disabilities And Caregiver Perspectives On Distance Learning In The Covid-19 Pandemic, Charlene Lee

Dissertations

As research on student learning during the COVID-19 pandemic continue to emerge, there remains a dearth of research on students with IEPs and how their caregivers experienced remote learning in a pandemic school year. This study examined the academic trajectories of students with IEPs and their caregivers’ perspectives towards distance learning during the COVID-19 pandemic. Measures included academic data extracted from the 2018–2019 school year and 2020–2021 school year and a survey of parental and caregiver opinions of the pandemic’s impact. Student academic data (N = 270) revealed a significant decrease in reading but not math trajectories. Notable differences were …

Pertenecemos: Trajectories Of Belonging, Knowing, And Discovering For Underrepresented Undergraduate Communicative Disorders And Sciences Students In California State Universities, Marcella C. Mccollum

Dissertations

The purpose of this study was to identify the ways that seniors in undergraduate programs in speech, language, and hearing sciences engaged with the department as they entered into their undergraduate programs, the factors that they considered when deciding whether to apply to graduate school in speech-language pathology, and perceptions of supports and barriers to entering into graduate school. This study partnered with seniors enrolled in public California university programs designed for future speech-language pathologists. A mixed methods design was utilized to provide a holistic account of student experiences. Three major themes emerged from the study. Throughout the process within …

The Role Of School Counselors In Advocating For Social Justice For All Students During The Covid-19 Pandemic, Amna Jaffer

Dissertations

The field of K–12 school counseling has evolved to embrace social–emotional and mental wellness aspects of students in addition to academic and career/college readiness. Social justice advocacy has been added to the role of school counselor by professional and educational entities. What is less clear is how well-versed school counselors are in social justice advocacy competencies, whether they are equipped to lead and advocate for social justice, barriers and accomplishments in doing so, and ways in which this role may be further developed and integrated into the field of school counseling, particularly in the context of the COVID-19 pandemic. As …

Faculty And Administrator Perspectives On Campus Internationalization At Selected California State University And University Of California Campuses: Individual Efforts And Interconnected Roles, Parinaz Zartoshty

Dissertations

This explanatory mixed-method research study explored campus internationalization trends by examining the practices of faculty and administrators engaged in campus internationalization efforts at selected four-year public institutions in Northern California. Most survey respondents and interviewees recognized the importance of internationalization, prompted greatly by their own personal transformational “international” journey, making them identifiable champions who can assist in promoting internationalization efforts. Most maintained that the system and their individual institutions do not provide adequate incentives to those faculty who are not personally motivated to engage in international activities and acknowledged internationalization does not float to the top of priorities. In instances …

Student Engagement And Universal Design For Learning (Udl): A Community College Case Study, Candice R. Nance

Dissertations

Community colleges have a significant impact on education. The community college population includes some of the most vulnerable students who have the most to gain from educational attainment. The objective of this mixed-methods case study was to investigate the practical implications and impact of Universal Design for Learning (UDL) on student learning, engagement, and sense of belonging. Forty-nine students participated in this study from seven sections of an asynchronous introduction to business course at a California community college during the COVID-19 pandemic. Findings suggested that the UDL intervention increased students’ final grade percentages, exam scores, and group project scores while …

A Description Of Impostor Phenomenon In Certified Registered Nurse Anesthesiologists, Jeffrey R. Darna

Dissertations

Background: Imposter Phenomenon (IP) is an evolving, multidimensional construct defined as self-perceived intellectual phoniness and professional ineptitude frequently experienced by individuals working in high performance or competitive environments. IP consequences include psychological distress, role under-optimization, and professional paralysis. Certified Registered Nurse Anesthesiologists (CRNAs) are at risk for impostorism; however, IP presence, intensity, and career effects are unknown.

Purpose: The study measured IP in CRNAs and determined the relationship between IP and select sociodemographic and practice variables.

Methods:

Design: A descriptive, cross-sectional correlation design measured IP using an Internet-based survey from a random sample of 170 members of the American …

Transitions In Palliative Care: Referral Time And Healthcare Utilization In Advanced Stage Colon, Rectal And Lung Cancer Patients., Ann Lawani

Dissertations

Background: Despite lung, colon, and rectal cancer being the leading and third leading cause of cancer-related death among both men and women respectively, few studies have examined Palliative Care Consultation (PCC) on healthcare utilization (HCU) in individuals with advanced stage diagnosis in this disease cohort. Extant research shows advanced stage cancer patients receive aggressive treatments, within the last 30 days of life. Palliative care is linked to less aggressive cancer treatment, and palliative interventions applied early, at diagnosis of advanced cancer, is more favorable for improving symptom and disease management. Patients and family members with early PCC are better informed …

Phenomenological Study Of The Lived Experience Of New Graduate Nurses Caring For Hospitalized Patients Living With Dementia, Geline Buenconsejo

Dissertations

Title. Phenomenological Study of the Lived Experience of New Graduate Nurses Caring for Hospitalized Patients Living with Dementia.

Purpose. This study explored new graduate nurses’ lived experiences in caring for hospitalized patients living with dementia.

Background. The first twelve months of transitioning from student to professional nurse in acute care settings are the most stressful, emotionally challenging, and mentally exhausting for new nurses striving to apply newly acquired skills into practice. Some of the most challenging patients for nurses to care for are hospitalized patients living with dementia (PtLWD). With the projected increase in the number of patients with dementia …

Trauma Recidivism: Threat Orientations And Recurrent Injury Perceptions, Molly Bauer, Ann M. Mayo

Dissertations

Purpose: To describe select sociodemographic and clinical variables, threat orientations, and the perceived likelihood of recurrent injury (PLRI) of individuals deemed at risk for trauma recidivism (TR).

Background: Injuries and violence are the leading cause of traumatic death among persons aged 1 to 44 in the United States. Trauma recidivism occurs when an individual experiences more than one significant injury requiring hospital care in a five-year period. The relationship between a trauma recidivist’s perception of recurrent injury and orientation towards a threat remains unclear.

Conceptual Basis: Trauma recidivism risk factors contribute to forming an individual’s PLRI. When individuals acknowledge the …

The Hustler Award Program, Julia N. Biayi

Dissertations

Problem: Hospitalized adults are at increased risk of falling due to multiple aspects, including but not limited to changes in health status, the environment, pain, weakness, confusion, and prolonged immobility. This project focused on the question: How will the utilization of the Hustler Award Program decrease fall rates in an adult inpatient medical-surgical unit?

Method: A prospective quality improvement pilot study focused on a 24-bed medical-surgical unit in a Midwest, 487-bed metropolitan-based facility.

Results: The results captured are for the evaluation period occurring from September through November 2021. The staff responded to 52-bed exit alarms, which yielded a response rate …

Impact Of Preoperative Psychological Evaluations On Bariatric Surgery Outcomes, Melanie A. Caustrita

Dissertations

Obesity is a major global health challenge affecting 603.7 million adults and is a risk factor for common illnesses such as diabetes mellitus II, chronic kidney disease, cardiovascular disease, gastroesophageal reflux disease, and poorly controlled hypertension. Americans have the highest rate of obesity. Patients with a body mass index (BMI) > 35 with one or more obesity related complications should be considered for bariatric surgery. Forty percent of patients seeking obesity treatment have at least one psychiatric illness with mood and anxiety disorders being the most common. Preoperative screening is recommended to identify patients with psychosocial risk factors that may lead …

An Investigation On The Impact Of Intestinal Oxygen Availability On Survival And Regulation Of Virulence In Listeria Monocytogenes, Damayanti Chakravarty

Dissertations

The deadly foodborne pathogen Listeria monocytogenes is a gram positive facultative anaerobic bacterium. It is the third leading cause of death from food-borne illnesses. Once ingested, it encounters various stressors in the gastrointestinal (GI) tract, including acidic pH, bile, and alterations in oxygen availability. Various studies have been done regarding the pathogen’s survival mechanism against acid and bile. Since the lower parts of the GI tract are anaerobic, it is imperative to investigate how physiologically relevant anaerobic conditions impact L. monocytogenes’s survival. Transcriptomic analysis of L. monocytogenes under conditions mimicking the GI tract was performed. A large number of genes …

Implementation Of The Bedside Mobility Assessment Tool In The Ambulatory Care Setting, Racquel Hermosura Ballinger

Dissertations

Falls remain a concern for healthcare organizations nationally. Fall rates at the site remained a concern, so an evidence-based approach was sought. The purpose of this quantitative, quasi-experimental quality improvement project was to determine if the implementation of Boynton's Bedside Mobility Assessment Tool (BMAT) used in conjunction with current fall practices would impact fall rates among patients 65 years and older undergoing a colonoscopy. The project was implemented in an ambulatory care setting in Southern California over four weeks. Sister Callista Roy's middle-range nursing theory, the adaptation model, and Neuman's systems theory were the scientific underpinnings of the project. Data …