Digital Commons Network^™

Stochastic Programming And Agent-Based Simulation Approaches For Epidemics Control And Logistics Planning, Xuecheng Yin

Dissertations

This dissertation addresses the resource allocation challenges of fighting against infectious disease outbreaks. The goal of this dissertation is to formulate multi-stage stochastic programming and agent-based models to address the limitations of former literature in optimizing resource allocation for preventing and controlling epidemics and pandemics. In the first study, a multi-stage stochastic programming compartmental model is presented to integrate the uncertain disease progression and the logistics of resource allocation to control a highly contagious infectious disease. The proposed multi-stage stochastic program, which involves various disease growth scenarios, optimizes the distribution of treatment centers and resources while minimizing the total expected …

Modeling Dewetting, Demixing, And Thermal Effects In Nanoscale Metal Films, Ryan Howard Allaire

Dissertations

Thin film dynamics, particularly on the nanoscale, is a topic of extensive interest. The process by which thin liquids evolve is far from trivial and can lead to dewetting and drop formation. Understanding this process involves not only resolving the fluid mechanical aspects of the problem, but also requires the coupling of other physical processes, including liquid-solid interactions, thermal transport, and dependence of material parameters on temperature and material composition. The focus of this dissertation is on the mathematical modeling and simulation of nanoscale liquid metal films, which are deposited on thermally conductive substrates, liquefied by laser heating, and subsequently …

Modeling And Design Optimization For Membrane Filters, Yixuan Sun

Dissertations

Membrane filtration is widely used in many applications, ranging from industrial processes to everyday living activities. With growing interest from both industrial and academic sectors in understanding the various types of filtration processes in use, and in improving filter performance, the past few decades have seen significant research activity in this area. Experimental studies can be very valuable, but are expensive and time-consuming, therefore theoretical studies offer potential as a cost-effective and predictive way to improve on current filter designs. In this work, mathematical models, derived from first principles and simplified using asymptotic analysis, are proposed for: (1) pleated membrane …

Shale Softening Based On Pore Network And Laboratory Investigations, Di Zhang

Dissertations

This dissertation consists of two major parts: Firstly, experimental investigation of four major shale softening mechanisms and quantifications of structural parameters. Secondly, numerical simulations of nano-scale flow behaviors using the previous experiments determined parameters based on modified pore network modeling.

Hydraulic fracturing is widely applied to economical gas production from shale reservoirs. Still, the gradual swelling of the clay micro/nano-pores due to retained fluid from hydraulic fracturing causes a gradual reduction of gas production. Four different gas-bearing shale samples are investigated to quantify the expected shale swelling due to hydraulic fracturing. These shale samples are subject to heated deionized (DI) …

Data-Driven Learning For Robot Physical Intelligence, Leidi Zhao

Dissertations

The physical intelligence, which emphasizes physical capabilities such as dexterous manipulation and dynamic mobility, is essential for robots to physically coexist with humans. Much research on robot physical intelligence has achieved success on hyper robot motor capabilities, but mostly through heavily case-specific engineering. Meanwhile, in terms of robot acquiring skills in a ubiquitous manner, robot learning from human demonstration (LfD) has achieved great progress, but still has limitations handling dynamic skills and compound actions. In this dissertation, a composite learning scheme which goes beyond LfD and integrates robot learning from human definition, demonstration, and evaluation is proposed. This method tackles …

Feedstock Powders For Reactive Structural Materials, Daniel Hastings

Dissertations

Metals as fuels have higher energy density per unit mass or volume compared to any hydrocarbon. At the same time, metals are common structural materials. Exploring metals as reactive structural materials may combine their high energy density with attractive mechanical properties. Preparing such materials, however, is challenging. Requirements that need to be met for applications include density, strength, and stability enabling the component to sustain the structure during its desired operation; added requirements are the amount and rate of the energy release upon impact or shock. Powder technology and additive manufacturing are approaches considered for design of reactive structural materials. …

Participatory Learning: Measuring Learning And Educational Technology Acceptance, Erick Sanchez Suasnabar

Dissertations

Participatory Learning (PL) integrates several learning approaches, engaging students throughout the entire assignment process for both online and face-to-face courses. Beyond simply providing a solution, students also craft a problem (problem-based learning), grade each other (peer assessment and feedback), evaluate themselves (self-assessment), and can view others’ work (learning by example). This dissertation research explores the resulting learning effects. Contributions to both educational and Information Systems research include extending an early PL model and experiments that applied the PL approach to examinations, by validating and testing new constructs based on user activity and critical thinking. In addition, the study explores a …

Analysis Of Container Throughput: Demand Forecast And Seaport Competitiveness Assessment, Hussain Talat Sulaimani

Dissertations

Seaports play a crucial role in the container industry, where they act as important nodes in the transport chain to facilitate international trade. In a competitive market, port capacity plays a significant role in defining its competitive position to attract demand and avoid congestion. Failing to provide suitable capacity results in the loss of market share. Therefore, port decision-makers face the challenge of maintaining and developing suitable port facilities to provide efficient services to port users. One of the aspects that decision-makers consider in the planning and development process is analyzing container demand. The analysis of container demand can be …

Towards Understanding The Role Of Central Processing In Release From Masking, Nima Alamatsaz

Dissertations

People with normal hearing have the ability to listen to a desired target sound while filtering out unwanted sounds in the background. However, most patients with hearing impairment struggle in noisy environments, a perceptual deficit which current hearing aids and cochlear implants cannot resolve. Even though peripheral dysfunction of the ears undoubtedly contribute to this deficit, surmounting evidence has implicated central processing in the inability to detect sounds in background noise. Therefore, it is essential to better understand the underlying neural mechanisms by which target sounds are dissociated from competing maskers. This research focuses on two phenomena that help suppress …

Designing Collaborative Lifelogging To Facilitate Learning In Collaborative Physical-Recreation Communities, Sayed Mousa Ahmadi Olounabadi

Dissertations

Since the 1940s, researchers have envisioned lifelogging as the systematic capture and utilization of lived experiences for augmenting learning, performance, and community Unfortunately, this vision was never actualized since few, if any, systems support lifelogging in the term's original sense. Technologies that emerged through the Quantified-Self (QS) movement allowed users to monitor and track almost every life aspect. However, the decontextualized self-tracking data QS systems produced are unsuitable for supporting learning and community engagement, and therefore have not made lifelogging a reality yet. Central to this dissertation is understanding how to augment learning and community through lifelogging. This is particularly …

Essays On Health Care Quality: Timeliness, Equity, And Efficiency, Abubakar-Sadiq Bouda Abdulai

Dissertations

According to the National Academy of Medicine (NAM) (formerly called the Institute of Medicine), a quality health care system embodies six attributes: timeliness, equity, safety, efficiency, effectiveness, and patient-centeredness. Timeliness is to avoid unnecessary delays in care delivery for patients and caregivers; equity is to ensure that the quality of care that patients receive does not vary based on their personal characteristics; safety is to ensure that the care that is intended to help patients does not harm them; efficiency is to avoid waste and optimize resource allocation to improve care delivery; effective care is one that relies on sound …

Reserve Price Optimization In Display Advertising, Achir Kalra

Dissertations

Display advertising is the main type of online advertising, and it comes in the form of banner ads and rich media on publishers' websites. Publishers sell ad impressions, where an impression is one display of an ad in a web page. A common way to sell ad impressions is through real-time bidding (RTB). In 2019, advertisers in the United States spent nearly 60 billion U.S. dollars on programmatic digital display advertising. By 2022, expenditures are expected to increase to nearly 95 billion U.S. dollars. In general, the remaining impressions are sold directly by the publishers. The only way for publishers …

Constructive Solution Methodologies To The Capacitated Newsvendor Problem And Surrogate Extension, Pinyuan Shan

Dissertations

The newsvendor problem is a single-period stochastic model used to determine the order quantity of perishable product that maximizes/minimizes the profit/cost of the vendor under uncertain demand. The goal is to fmd an initial order quantity that can offset the impact of backlog or shortage caused by mismatch between the procurement amount and uncertain demand. If there are multiple products and substitution between them is feasible, overstocking and understocking can be further reduced and hence, the vendor's overall profit is improved compared to the standard problem. When there are one or more resource constraints, such as budget, volume or weight, …

Advances In Deep Learning With Applications To Computer Vision And Astronomy, Zhihang Hu

Dissertations

Deep Learning has spanned a variety of applications in computer vision as well as computational astronomy. These two aspects obtained similar data structure, therefore, their solutions can be transferable between each other. This dissertation look into two video-related tasks in computer vision and propose a novel problem in computational astronomy.

Specifically, acquiring an in-depth understanding of videos has been a cornerstone problem in computer vision. This problem has been studied by various researchers from different perspectives, among which video prediction has attracted much attention. Video prediction aims to generate the pixels of future frames given a sequence of context frames. …

Towards Quality By Design (Qbd) Of Pharmaceutical Oral Films Loaded With Poorly Watersoluble Drugs, Eylul Cetindag

Dissertations

Oral films are an emerging drug delivery dosage form with numerous advantages such as ease of handling, the possibility to circumvent the first-pass metabolism, better patient compliance, capability for continuous manufacturing, and as a platform for personalized medicine. As films are different from other final dosages by their dimensions and their matrix form, further research is required to better understand the impact of excipient and drug on product performance to assure a consistent and good quality product. Therefore, this dissertation aims to contribute towards the processability and manufacturability of films by examining the impact of the materials and processes. First, …

Learning Of Radar System For Target Detection, Wei Jiang

Dissertations

In this dissertation, the problem of data-driven joint design of transmitted waveform and detector in a radar system is addressed. Two novel learning-based approaches to waveform and detector design are proposed based on end-to-end training of the radar system. The first approach consists of alternating supervised training of the detector for a fixed waveform and reinforcement learning of the transmitter for a fixed detector. In the second approach, the transmitter and detector are trained simultaneously. Various operational waveform constraints, such as peak-to-average-power ratio (PAR) and spectral compatibility, are incorporated into the design. Unlike traditional radar design methods that rely on …

Exploring Fused Deposition Modeling (Fdm) Three-Dimensional Printing Tablet Design Options For Pharmaceutical Dosage Forms, Guluzar Gorkem Buyukgoz

Dissertations

This dissertation examines the use of Fused Deposition Modeling (FDM) based three-dimensional (3D) printing approach for developing patient-specific dosage forms and addressing related technical challenges in such drug delivery systems. The first main objective is to explore pharmaceutical tablet design options using novel FDM 3D printing technology as the drug delivery platform such that drug form and tablet properties are tailored by considering patient age-specific formulations and dissolution control. Of the five different design options, two proposed options meet the main objective of providing similar drug release, whereas the popular option of fixed drug concentration but differing tablet size could …

Novel Statistical Modeling Methods For Traffic Video Analysis, Hang Shi

Dissertations

Video analysis is an active and rapidly expanding research area in computer vision and artificial intelligence due to its broad applications in modern society. Many methods have been proposed to analyze the videos, but many challenging factors remain untackled. In this dissertation, four statistical modeling methods are proposed to address some challenging traffic video analysis problems under adverse illumination and weather conditions.

First, a new foreground detection method is presented to detect the foreground objects in videos. A novel Global Foreground Modeling (GFM) method, which estimates a global probability density function for the foreground and applies the Bayes decision rule …

From Roundabout To Roundabout: Tahrir Square (1869- 2021), Mariam Abdelazim

Dissertations

Tahrir Square not only represents a symbol of liberation but also reflects the modern history of Egypt. Its several physical changes signify the rise and fall of the monarchy, colonialism, modernism, nationalism, capitalism, echoing a constantly changing definition of the Egyptian public space. And while the surrounding façades physically define the square, either the authorities or the public control its activities.

Khedive Ismail founded the square around 1869 as a roundabout on his “Paris along the Nile” modern city. Between 1882 and 1947, the site became the barracks’ location for the British troops who colonized Egypt. In 1952, an Egyptian …

The Effect Of Choice Programs On Student Achievement, David Whitham

Dissertations

Educational choices provide unique learning opportunities for all children to have access to and allow parents to be the decision-makers for their child’s education (Valant & Lincove, 2018). Brown v. Board of Education (1954) of Topeka sparked the creation of choice programs in the United States to end the segregation of students and empower families to be direct stakeholders in their child’s education (Brown v. Board of Education, 1954). This study focused on a school district in the Midwest region of the United States, which investigated the expansion of learning options available to the community. The purpose of this study …

The Influence Of Gender, Weight, And Age On Osa Progression In Rem And Nrem Sleep, Alan M. Jones

Dissertations

In the United States, it is estimated that obstructive sleep apnea (OSA), which greatly increases the risk of many adverse health conditions, affects over 25 million adults with prevalence rates that have drastically increased over the last two decades, likely due to the obesity epidemic. Research has identified several explanatory variables of OSA, but studies have indicated that OSA incidence and severity is mainly determined by three variables: gender, weight and age.

The purpose of this study is to investigate the effects and importance of gender, weight, and age on OSA levels (as measured by respiratory disturbance index (RDI) values) …

Temporal Evolution Of Structure And Function In The Periphery And Central Auditory Systems With Mild Blast Induced Tinnitus In Rat Animal Models, Ningning Shao

Dissertations

Exposure to blast causes debilitating trauma including tinnitus among soldiers and civilians (Cave et al., 2007; Remenschneider et al., 2014; Singh et al., 2016). Tinnitus is a constant ringing noise perception without external acoustic event; it affects sleep, concentration, behavior, leading to suicidal tendencies (Swan et al., 2017). Though blast induced tinnitus has been studied, structural and functional dysfunctions along auditory systems have not been systematically studied. It was hypothesized in this work that blast causes tinnitus even while the ears are mechanically protected, and the damage occurred in both central and peripheral auditory systems, which contributed to increased anxiety …

A Description Of Cultural Humility As Perceived By Nursing Faculty In Baccalaureate Nursing Education, Linda Webster

Dissertations

In diverse populations, health inequities can exist, thereby contributing to health disparities. A lack of knowledge regarding unfamiliar cultural patterns and practices by health care providers can contribute to miscommunication and mistrust. The willingness to adopt the practices of self-awareness and self-reflection with critique is cultural humility. This concept may help to reduce health inequities and suboptimal health outcomes when a mutual respect for culture and diversity is present.

A foundational, qualitative descriptive study was proposed to investigate cultural humility as perceived by nursing faculty. The purpose of this study was to describe the concept of cultural humility from the …

Stress, Anxiety, And Depression: Role Of Campus Connectedness, Social Support, And Coping Among Nepalese Nursing Students, Priscilla Samson

Dissertations

High levels of stress, anxiety, and depression (SAD) can adversely influence physical health, psychological well-being, and academic and clinical performance of nursing students. Numerous studies have identified the factors associated with SAD; however, a paucity of empirical research addresses the relationship of SAD with campus connectedness (CC), perceived social support (PSS), and coping. The purpose of this quantitative cross-sectional study, guided by Lazarus and Folkman's theory of stress, coping, and adaptation, was to determine the prevalence of SAD and examine its relationship with CC, PSS, and coping among undergraduate nursing students of Nepal. Survey research was conducted using depression anxiety …

An Explanatory Sequential Study Of Cadet Commitment At The United States Air Force Academy, Justin Pendry

Dissertations

Character and leadership are the essence of the United States Air Force Academy (USAFA). USAFA’s mission is to develop leaders of character responsible for defending this nation. Our country has the most lethal Air Force this world has ever known. The men and women entrusted with protecting its citizens must be committed to the highest standards of ethical leadership. To accomplish this, USAFA provides a robust education and training program with extensive opportunities for cadet development. However, achieving USAFA’s vision of creating the nation’s best leaders of character relies upon cadet trust in the process and commitment to their development …

Using Visual Storytelling To Design Solutions-Based Approaches To Homelessness, Peggy Peattie

Dissertations

Despite millions of dollars spent over several decades on assistance programs, the nation’s homeless population has increased for the last four years in a row. The number of people reporting as homeless for the first time doubled in San Diego between June 2019 and June 2020. Trying to impose a one-size-fits-all model of care on a population comprised of unique individuals has resulted in many homeless opting for the street rather than subjugating themselves to rules they feel do not treat them with respect and dignity. Yet, the perspectives of homeless individuals are excluded from decision-making dialogue around policies and …

Alcohol As A Catalyst For Hiv-Associated Neuroinflammation And Tbi-Induced Iron Toxicity, Agnieszka Agas

Dissertations

Alcohol has long been considered an exacerbator of diseases, disorders, and injuries as well as many of the accompanying symptoms. As an alternative approach, this dissertation explores alcohol as a catalyst for two different human disease conditions, human immunodeficiency virus (HIV)-associated neuroinflammation and traumatic brain injury (TBI)-induced iron toxicity. In HIV-1 infection, this dissertation presents a novel anti-viral drug, called Drug-S, for a possible inhibition and treatment of HIV-1 disease progression.

The first aim explores the influence of alcohol with HIV-associated neuroinflammation on macrophage migration across an in vitro model of the blood brain barrier. There is a gap in …

Exploring Perspectives Of Legal Nurse Consultants As Entrepreneurs: A Case Study, Evelyn H. Bell

Dissertations

Entrepreneurial opportunities exist in the nursing profession for nurses who are seen as innovative, forward thinkers, and have a desire to work independently. Entrepreneurship as a legal nurse consultant is a career choice that allows for that independence while supporting the legal community. Legal nurse consultants use training and clinical experience to provide expert opinions related to practice standards of care and damages. In this exploratory qualitative case study, the researcher explored the perceptions of legal nurse consultants regarding the journey to become entrepreneurs. The problem that was the focus of this study was absence of sufficient and applicable research …

Nursing Faculty Perceptions About Peers With Physical And Sensory Disabilities, Tammy C. Killough

Dissertations

Nursing faculty perceptions of peer faculty with sensory and physical disabilities is an important topic for research, as the review of literature indicates that this topic has not been adequately investigated. Current research related to nursing faculty with disabilities has been primarily focused on nursing students with disabilities. This study explored nursing faculty's perceptions about nursing peers with disabilities. A descriptive qualitative research design was selected to best reflect the viewpoints of the participants and to allow for a more holistic open view of participants' perceptions about the research questions. The participants participated in an online survey using Survey Monkeyâ„¢. …

Male Nurses' Experiences Of Gender Stereotyping Over The Past Five Decades: A Narrative Approach, Michael W. Finnegan

Dissertations

Negative stereotyping of men in nursing has been a chronic problem that has a direct effect on males and detracts from efforts to recruit and retain them. At this time in American history (2018), traditionally male-dominated professions are making significant progress toward the goal of a gender-balanced workplace. However, the opposite is not true. Traditionally female-dominated professions are not attracting or appealing to men. In the nursing profession, the number of male nurses is relatively small and has remained relatively fixed over time. Estimates vary between 6-15 percent, with the current average being approximately 11 percent (American Nurses Association, 2014). …