Digital Commons Network^™

Urban Freight Transportation: The Interaction Of Home Deliveries In Cities, Carla A. Tejada

Dissertations and Theses

The movement of freight in urban areas is a key factor in the sustainable development of cities. If managed correctly, it can potentiate economic growth and support urban lifestyles. Nevertheless, the movement of goods in cities is usually in conflict with other urban flows and is generally perceived as having more negative externalities, above all for environmental and social sustainability. While the first focuses on measuring the impact on the environment, the latter focuses on measuring the impacts of business decisions on people. The main goal of this dissertation is to study the relationship that urban goods movements, mainly residential …

Machine Learning Approach To Predict Tdcs-Induced Electric Current In The Human Brain, Chikako Olsen

Dissertations and Theses

Background: Transcranial direct current stimulation (tDCS) is a promising non-invasive method for treating neurological and psychiatric disorders and enhancing cognitive function. However, the underlying mechanisms of tDCS are not fully understood, and there is no ground truth for determining, non-invasively, where in the brain tDCS electrical currents flow. At the same time, effective neuronal engagement from tDCS requires accurate localization of the induced currents to specific brain target regions. Machine Learning (ML) has the potential to significantly improve the accuracy and precision of tDCS current prediction. This study aims to develop a novel approach using ML to predict the location …

Analysis Of Chemical Elements In Basalts Using Mislabeled Data, A Machine Learning Approach, Jenifer Vivar

Dissertations and Theses

Scientists use basalt chemistry to discriminate among different tectonic settings. There are well-known chemical elements used to classify tectonic settings. An exploration of new features is done using Logistic Regression and Random Forest to discover any new elements of interest. The models were used with other tools, such as recursive feature elimination and permutations, to increase reliability. Among the scarcely explored chemical elements are Terbium (Tb), Holmium (Ho), Samarium (Sm), and Erbium (Er). The data used for the exploration contained many outliers. Therefore, an ensemble model was created to explore the location and composition of such outliers. The ensemble was …

Exploring Information Leakage In Historical Stock Market Data, Edison Hua

Dissertations and Theses

Information leakage is a major concern for traders who want to execute large orders without affecting the market price. In this paper, we explore the sources and effects of information leakage in historical stock market data using various methods and metrics. We first define information leakage as a pattern caused by a trader that would otherwise not occur without the trader’s activity. Using historical data, the direct impact of a potential large trade cannot be measured, but we consider a minimal impact large trade to be one that minimizes changes to the established trading data. We then analyze how information …

Lidar Remote Sensing Of Aerosol And Ozone Profiles And Application To Air Quality Studies In New York City Area, Dingdong Li

Dissertations and Theses

Ozone (O₃) and PM2.5 (Particulate Matter with a diameter less than 2.5 μm) are the main pollutants in New York City (NYC) due to high levels of anthropogenic emissions, complex urban meteorology, and regional transport. However, vertical distribution observations are still lacking. This thesis utilizes lidar remote sensing techniques to retrieve the vertical distribution of O₃ and aerosols and study air pollution episodes in the NYC metropolitan area.

The thesis includes three parts. The first part analyzes continuous ceilometer observations of aerosols and atmospheric mixed-layer height (ML). We investigate the vertical, diurnal, and seasonal characteristics of the …

Anomaly Based Intrusion Detection System Through Remote Virtual Machine Introspection, Huseyn Huseynov

Dissertations and Theses

Research on identifying malicious applications is an important direction in information security, especially when it comes to detection of evasive malware such as keyloggers, trojans, rootkits and their derivatives. Inspired by a biological immune system and based on negative selection algorithm approach to detect various types of malwares is proposed in this paper.

By deeply studying Linux kernel, understanding links behind different internal system processes, examining, and experimenting with hundreds of various keyloggers we propose a single Artificial Intelligence based solution as a comprehensive protection against wide range of malwares. Developed Intrusion Detection System (IDS) can be deployed in the …

Mechanically Driven In Vivo Osteocyte Ca2+ Signaling: Aging And Pharmacologic Effects, James Padgett

Dissertations and Theses

Bone’s ability to respond and adapt to mechanical loading declines significantly with age which is a major contributor to bone fragility. It is widely accepted that osteocytes are the key cells responsible for orchestrating the development of the “ideal” skeleton. This ability is attributed to osteocyte’s role as the primary mechanosensing cell that is responsible for maintaining the skeleton’s integrity throughout life. Recent work from our laboratory has shed light into how osteocytes respond to mechanical loading in vivo. The breakthrough approaches that enabled these discoveries were development of: (1) the first ever reporter mouse model with a genetically encoded …

Microfluidic Dual-Gel Cell Culture Model For Studying Cell Migration Under Controlled Interstitial Flow, Alimohamamd Anbari

Dissertations and Theses

Abstract

Interstitial flow, the slow flux of fluid occurring in the interstitial space of the extracellular matrix (ECM), affects the migration of many cell types through individual and synergistic contributions of several biophysical and biochemical phenomena. Notably, interstitial flow is linked to ECM permeability and provides direct mechanical cues via shear and normal stress. Additionally, the flow also couples with biomolecular diffusion to provide chemotactic signals to the cells. Recent in vitro studies have indicated that tumor cell migration is affected by interstitial fluid velocity and ECM permeability through the mechanisms of (1) autologous chemotaxis and (2) integrin-mediated focal adhesion …

Optimization Of Optical Nanosensor Response For The Detection Of Anthracyclines Using A Binary Machine Learning Classifier, Myesha Thahsin

Dissertations and Theses

Pharmacokinetic variables such as interindividual variation in metabolizing and eliminating drugs makes dose selection of chemotherapeutic anthracyclines difficult. One potential solution to determining dosing levels of an anthracycline is the development of non-invasive sensors to monitor their pharmacology in vivo. Single-walled carbon nanotubes (SWCNT) have substantial potential for in vivo sensor development, as they exhibit near-infrared fluorescence in the tissue-transparent window and a robust response to their local environment. An emerging method for evaluating and optimizing SWCNT sensor response is through machine learning. In this study, anthracyclines Daunorubicin, Doxorubicin, Epirubicin, Mitoxantrone and Idarubicin, were used to interrogate 12 SWCNT preparations …

Shallow Water Coral Distribution And Its Response To Climate Change, Amaury De Jesus

Dissertations and Theses

Shallow water corals are one of the main reef-building organisms that secrete carbonates as their skeletons, and therefore, are one of the major sinks of CO2 in the ocean. These reef builders are also very crucial to marine environments and human society. As the global energy demand continues rising, fossil fuel burning increases at a faster pace despite the increase in energy supply using clean and renewable energy. The increase of CO2 in the atmosphere has been shown to exacerbate global warming and may cause ocean acidification, threatening the habitat of shallow-water corals. Many recent observations show alarming signs of …

Nonlinear And Time-Modulated Metamaterials: Applications At Microwave Frequencies, Hady Mohammed Saied Sayed Moussa

Dissertations and Theses

Metamaterials (the Greek prefix meta, means beyond) are artificially structured materials that interact with the incoming waves in extraordinary ways, beyond the properties of natural materials, yielding unusual and exotic electromagnetics phenomena. By careful engineering of the material properties, invoking nonlinear elements and/or time-modulating some of the material parameters, linearity and/or time-invariance can be broken in metamaterials, enabling extraordinary wave phenomena that open opportunities for the microwave engineering community, including the creation of nonreciprocal devices, frequency conversion, and more. In this dissertation, we explore, investigate, design, and fabricate metamaterials that open new applications for nonlinearity-based and time-varying devices, particularly in …

Ultra-High Field Mri Methods For Precise Anatomical And Spectroscopic Measurements In The Brain And Application To Neurological And Neuropsychiatric Diseases, Judy Alper

Dissertations and Theses

Neurological and neuropsychiatric diseases and disorders are a major burden on society, impairing the health and functioning of millions of people every year. There is a need to define the biological bases of these diseases and identify potential biomarkers to improve diagnosis, monitoring, and treatment efficacy across multiple diseases.

Magnetic resonance imaging (MRI) is a noninvasive imaging technique which facilitates detection of brain lesions and visualization of the brain overall. However, limitations in contrast and resolution at clinical field strengths may hinder investigation of the underlying biological mechanisms of these diseases. Ultra-high field MRI scanners, such as those at 7-Tesla, …

Teacher Retention: Perceptions Of Teachers And School Administration In Rural Schools In Nebraska, Andrew Offner

Dissertations and Theses

Teacher retention has become a major challenge for schools over the past several years. Rural school districts have become increasingly short on staff and are struggling to retain the staffs they have. The study had four purposes: (a) to determine teachers' perceptions of the factors leading to their retention, (b) to determine administrators' perceptions of the factors leading to teacher retention, (c) to determine differences in perceptions of teachers and administrators based on personal characteristics, and finally, (d), to determine the differences between teachers' and administrators' perceptions of factors retaining teachers in rural school districts. This quantitative study examined the …

Explorations Of A Topology Constructed On The Maximal Ideals Of A Boolean Algebra, Abbigal Moos

Dissertations and Theses

The primary purpose of this thesis is to construct a topology on the collection of maximal ideals of a distributive and complemented lattice using the hull-kernel methodology. Through the construction of this topological space, we discovered that the space is compact, zero-dimensional, and Hausdorff. Next, we looked at the properties of some lattices, namely the power set of a finite set ordered by inclusion and the set of all positives divisors for some arbitrary integer ordered by divisibility. Whenever these lattices were both distributive and complemented, we constructed a topology on the collection of maximal ideals of the lattices using …

Mathematical Analysis Of Convolutional Neural Networks, Daniel Mccarter

Dissertations and Theses

In this thesis, the main topic is convolution as a mathematical operation and Convolutional Neural Networks (CNN’s). While convolution is classically defined as a function, it can also be defined as an operator from Lp(R) to itself for 1 ≤ p ≤ 2 where Tw(f ) = f ∗ w given some w ∈ L1(R). CNN’s use convolution in its convolutional layers. Defining a neural network to be the composition of layer maps, we find that the neural network is, by necessity, Lipschitz. While CNN’s can be very powerful for image classification, slight changes to an image can completely fool …

A Study Of Verbal Rumination, Relationships, Stress And Identity On Health Communication In Collegiate Athletics, Landon Mary Ellen Kemp

Dissertations and Theses

College athletes are a unique group of individuals as they face many positive and negative challenges when competing in a collegiate sport. Verbal rumination is repetitive talk about a particular issue, accompanied by adverse effects for an individual. Verbal rumination is a common strategy athletes use to cope with difficulties along with managing challenging situations in their athletic program. To explore factors that might inspire or impede verbal rumination in collegiate athletics, the present study examines the quality of coach and teammate relationships, perceived stress and athlete identity. Results revealed the impact of relationships between coaches and athletes in respect …

Chemistry Of Fluorinated Functional Groups: Impact On Molecular Packing, Optoelectronic Properties, Electrochemical Polymerization, Photochemistry, And Reagent Development, Shankar Gairhe

Dissertations and Theses

Fluorinated functional groups have attracted great interest in various aspects of chemistry applications including pharmaceuticals, organic electronics, and polymers. The aim of this study is to explore the impact of fluorinated functional groups on 1) optimization of crystal structures and electronic properties of organic semiconductor molecules, 2) electrochemical polymerization of fluorinated aromatics, 3) photochemical reactivity of carbonyl compounds, and 4) generating new nucleophilic fluorination reagents. Our initial work demonstrates that long fluoroalkyl side chains on planar aromatic systems give rise to fluorine-fluorine (F---F) attractive interactions, assisting formation of lamellar packing motif in the solid state. Surprisingly, introducing shorter perfluoroalkyl side …

An Examination Of Pell Grant Recipient Graduation Rates And Institutional Expenditures At Public Baccalaureate Institutions, Lamont Alphonso Sellers

Dissertations and Theses

The present study examines the differences between public baccalaureate institutional expenditures and Pell Grant recipient graduation rates at high and low Pell Grant recipient graduating institutions. IPEDS data were analyzed, including instructional, academic support, student services, institutional support, and Pell Grant recipient 6-year graduation rates from the 2018 academic reporting year. Results from a Mann-Whitney U test compare 99 institutions divided into a high graduation rate group (N_high=40) and a low graduation group (N_low=59). The analysis showed there are mean rank differences between the groups that are statistically significant. These results support the need for further study to make sense …

In Whitman's Wake, Kacie Megan Fodness

Dissertations and Theses

In Whitman’s Wake argues that nineteenth-century American writing includes a living invitation for its future readers. The kind of invitational writing prioritized in this work has not yet been fully accounted for in literary criticism. What’s more, even when we as readers have experienced such an invitation (one we feel is for us) we have not followed the feeling far enough. As a result, scholarship has largely neglected, and perhaps has consciously rejected, the intentional action of a writer that creates an encounter with their future reader. My project contributes to the ongoing critical conversation around the relationship of readers …

Teacher Retention: Retaining Teachers In High-Needs, Urban Secondary Schools In A Midwest State Post-Pandemic, Christopher Kenneth Schmit

Dissertations and Theses

Teacher retention has been a challenge for most schools for several years. High-needs schools have been known to have twice the trouble with teacher retention as schools not considered high-needs. The purpose of this study was to identify effective practices school principals can implement to retain teachers at high-needs, urban secondary schools. This quantitative study called on teachers from high-needs schools in Iowa to complete a survey identifying principal qualities related to retention, perceived reasons for teacher attrition, and reasons they continue to teach at their current school. Three hundred eighty-five teachers from five different Iowa school districts participated in …

Evaluating The Effects Of A Social Skills Training Program For Children With Asd Generalized To A P.E. Setting, Anissa Johns

Dissertations and Theses

ASD is a developmental disability, or group of conditions which begin during the developmental period and impact day-to-day functioning, which can cause significant social, communication, and behavioral challenges (CDC, 2019). According to the CDC (2014) Autism Spectrum Disorder occur in every 1 in 36 children. ASD is characterized by persistent deficits in social communication and social interaction across multiple contexts (American Psychiatric Association, 2020). The diagnosis also requires the presence of restricted repetitive patterns of behavior, interests, or activities. Among the number of social skills training modalities used to promote positive social skill development for children with ASD, the Superheroes …

Closing The Digital Divide: Understanding Organizational Approaches To Digital Accessibility In Higher Education, Angela Kae Jackson

Dissertations and Theses

Digital accessibility practices are becoming standardized in higher education as institutions seek to meet compliance with federal and state equal access laws. Students with disabilities have equal rights to access university programs and services in digital format. The widespread use of assistive technology, artificial intelligence, and content available in digital format brings forth ethical and legal concerns about equal access for individuals with disabilities. While broad approaches to digital accessibility in higher education are in the literature, there is a growing need for more studies to examine comprehensive approaches to digital accessibility across multiple units, disciplines, and the organization's hierarchy. …

Highly Power Dense Dc To Three-Phase Ac Modular Converters With Tiny Module Capacitors, Wiwin Hartini Lew

Dissertations and Theses

A Modular Multilevel Converter (MMC) is an attractive candidate in high power conversion due to its modularity and scalability. The energy storage element, namely the module capacitance in the MMC submodule circuit, is typically large and when scaled to convert high power, requires very bulky module capacitors. In addition to deteriorating the power density, the design necessitates the use of electrolytic capacitors, which further affects the overall converter efficiency and reliability. This research presents an MMC submodule topology and the accompanying modulation approach that reduces the submodule capacitance requirements significantly compared to conventional MMC topology (few micro-farads versus several milli-farads). …

Cloud Container Security’ Next Move, Vishakha Sadhwani

Dissertations and Theses

In the last few years, it is apparent to cybersecurity experts everywhere that the proverbial container tech genie is out of the bottle, and has been widely embraced across multiple organizations. To achieve the flexibility of building and deploying applications anywhere and everywhere, cloud native environments have gained great momentum and made the development lifecycle simpler than ever. However, container environments brings with them a range of cybersecurity issues that includes images, containers, hosts, runtimes, registries, and orchestration platforms, which needs the necessity to focus on investing in securing your container stack.

According to this report[1], released by cloud-native …

Scientology's Faq: Sciencing, Tech-Romancing, Simulacra, & Simulation An Estranged Content Analysis, David Scott Morrill

Dissertations and Theses

This thesis examines how the practice of sciencing, tech-romancing, simulacra, and simulation manifests in both the text and symbols used on audiences of the Church of Scientology’s outreach materials. It specifically examines its official FAQ page. Self-framing was observed that satisfied the definition of sciencing and tech-romancing. Under an Estranged approach, Morrill examined selections of the Church’s FAQ pages, coding for instances of sciencing, tech-romancing, simulacra, and simulation. The data indicate that the Church frequently adopts simulacra and engages in simulation. The Church was seen frequently adopting technological and scientific symbols and jargon. The degree of sciencing, tech-romancing, simulacra, and …

Confederate Statues In University Opinion Newspaper Articles: An Analysis Of Themes And Attachment, Jamie Nicole Knopf

Dissertations and Theses

Many have asked for Confederate monuments' removal while others argue that they should remain or be recontextualized. Knopf analyzed themes found in Southern university student newspapers on the monument issue and how the statues related to community attachment. Using thematic analysis, Knopf identified six themes across the articles, and found that both removal and recontextualization arguments refer to the ideology behind the statues and the impacts this can have on students. Instances of attachment were used in both removal and recontextualization articles.

Possibilities For Inertial Electrostatic Confinement Fusion, Jeffrey Edward Black

Dissertations and Theses

While most of the fusion energy research is focused on magnetic confinement, there have been several alternative confinement methods aimed at the development of smaller and less expensive reactors. A number of these devices utilize a spherically convergent beam of recirculating ions, a technique known as inertial electrostatic confinement (IEC). This study looks at several aspects of IEC devices, including measurements of the fusion rate of an IEC device with a wire mesh electrode cathode, and a solid titanium cathode. In addition, several computational studies were performed to explore the possibilities for IEC fusion. These include development of a 1D-1P …

Scaling Epa-Rimm With Multicore System Management Interrupt Handlers, Alexander K. Freed

Dissertations and Theses

Continuous runtime integrity measurement mechanisms (RIMMs) can be used for timely detection of kernel and hypervisor rootkits. Researchers have proposed running RIMMs in privileged execution environments, such as the x86 architecture’s System Management Mode (SMM), to detect interference from rootkits that have gained control of the host operating system. However, the extended amount of time in SMM required to perform inspections can cause severe disruption to the host. A previously proposed RIMM design called EPA-RIMM addresses this by decomposing long inspections across multiple System Management Interrupts (SMI), the interrupt used to invoke SMM.

EPA-RIMM is intended for deployment on server-class …

K-12 Racial Equity Work In The Predominantly White Pacific Northwest: Interracial Conversations, Counter-Stories, And Considerations, Bradley Justin Parker

Dissertations and Theses

K-12 public education in the United States, post Brown v. Board of Education (1954), has historically maintained a predominantly White teaching force, and has persistently underserved students of Color in terms of academic, social, and emotional outcomes. Additionally, K-12 school-based racial equity work that strives to address the operation of racism is inconsistent, difficult to measure, and has not demonstrably created more racially equitable experiences or outcomes for students or educators of Color. In this project, I critically explore K-12 school-based efforts towards more racial equity in the predominantly White Pacific Northwest, and I take an intentional and critical look …

Applying Biomimetic Passive Dynamics To A Quadruped Robot Leg, Emma Krnacik

Dissertations and Theses

The study of synthetic nervous systems is an emerging field within biomimetic robotics as an alternative to more classic control techniques. As the modeling of these nervous systems becomes more accurate, it is important to note that the nervous system and physical system co-evolved and continue to operate in an interdependent fashion. Many legged robots, including the existing quadruped in the AARL, have leg systems that may have similar geometrical properties to that of a mammal, but have significantly different dynamic properties. This paper presents a method for designing a limb so that the passive dynamics more accurately represent that …