Digital Commons Network^™

Novel Image Descriptors And Learning Methods For Image Classification Applications, Ajit Puthenputhussery

Dissertations

Image classification is an active and rapidly expanding research area in computer vision and machine learning due to its broad applications. With the advent of big data, the need for robust image descriptors and learning methods to process a large number of images for different kinds of visual applications has greatly increased. Towards that end, this dissertation focuses on exploring new image descriptors and learning methods by incorporating important visual aspects and enhancing the feature representation in the discriminative space for advancing image classification.

First, an innovative sparse representation model using the complete marginal Fisher analysis (CMFA-SR) framework is proposed …

Practical Vortex Beam Generation, Nedime Pelin Mohamed Hassan Salem

Dissertations

Vector vortex beams are monochromatic electromagnetic wave fields carrying spin angular momentum (SAM) and orbital angular momentum (OAM). Spin angular momentum is associated with the polarization of the field, whereas OAM yields an azimuthal field dependence of the form exp( jqφ), where φ is the azimuthal angle, and q is an integer designating the helicity order, which is also known as the topological charge of the vortex beam. Vortex beams owe their names to the characteristic on-axis phase singularity and amplitude null.

In this study, a new method to generate vector vortex beams in the microwave regime is devised …

Theoretical Studies Of Photoinduced Dynamics And Topological States In Materials With Strong Electron-Lattice Couplings, Linghua Zhu

Dissertations

First, we study the nonequilibrium dynamics of photoinduced phase transitions in charge ordered (CO) systems with a strong electron-lattice interaction and analyze the interplay between electrons, periodic lattice distortions, and a phonon thermal reservoir. Simulations based on a tight-binding Hamiltonian and Boltzmann equations reveal partially decoupled oscillations of the electronic order parameter and the periodic lattice distortion during CO melting, which becomes more energy efficient with lower photon energy. The cooling rate of the electron system correlates with the CO gap dynamics, responsible for an order of magnitude decrease of the cooling rate upon the gap reopening. The work also …

Factors That Influence Students’ Decisions To Either Drop Out Or Graduate From High Schools In A Western Kentucky School District, Donna Kay Crouch

Dissertations

The purpose of this research was to identify and examine trends in the themes and patterns revealed in the qualitative analysis of the focus group interviews. Data were derived from responses from 21 graduates and six dropouts who answered questions from interview guides. Findings from the analysis indicate both graduates and dropouts experienced similar barriers throughout their academic career. The barriers identified were institutional, situational, and dispositional. Six themes were identified from the three barriers. They included employment, educational/remediation services, attendance, discipline and/or legal issues; educational values, and student-educator relationships. According to the data, these themes were not mutually exclusive …

Comparison Of Student Success Between Graduate And Undergraduate Students On The Missouri Content Assessments At A Private Midwestern University, Christina Been

Dissertations

This study analyzed the results of undergraduate and graduate teacher candidate scores on the Elementary Missouri Content Assessment at a private Midwestern University. The intent was to examine the possibility of a difference between pre-service teachers who satisfied coursework requirements through an undergraduate program or through a graduate program. This study focused on the content knowledge domain of teacher knowledge that had been the focus of teacher competency studies since Lee Shulman’s research in 1986. This study used pre-service teacher Missouri Content Assessment scores, subtest scores, number of attempts to earn a passing score, number of years since a college …

Thermosetting Polymers Via Azide Alkyne Cycloaddition, Richard H. Cooke Iii

Dissertations

This dissertation exploits properties inherent to azide-alkyne cycloaddition and applies practical solutions to difficult problems. Chapter II addresses structure-property relationships in glassy azido-alkyne matrices by varying the identity of the central linkage within tetrapropargyl bis-aniline-type crosslinkers, and by the addition or omission of Cu(I) catalyst. This systematic study showed that an ether or methylene linkage yielded lower melting tetrapropargyl crosslinkers that were soluble in, and produced homogeneous, networks when cured with, a standard azido resin, di(3-azido-2-hydroxypropyl) ether of bisphenol-A; in contrast, a sulfone linkage yielded a relatively insoluble crosslinker and poorly dispersed, heterogeneous networks when reacted with the same …

Induction Programs, Teacher Efficacy, And Inquiry Practices In Novice Teachers, Anisha Munshi

Dissertations

Induction Programs, Teacher Efficacy, and Inquiry Practices in Novice Teachers

This purpose of this study was to identify the influence of Induction Programs on first-year

teachers. Research shows that a large percentage of novice teachers leave the profession within the first five years. Novice teachers often begin the first year of teaching with a limited understanding of challenges that are faced daily by teachers in classrooms. While teacher training programs provide ideas of how teachers can plan effective lessons and manage classroom time effectively, it is often through daily experiences that novice teachers can truly understand the gamut of challenges …

Examining The Efficacy Of Inclusive Practices And Its Impact On The Academic Achievement Of High School Students With Mild To Moderate Disabilities, Paulette C. Cobb

Dissertations

There is extensive research in elementary education on effective practices that support academic success for students with mild to moderate disabilities in general education; however there is a dearth of research on high school inclusion practices. A survey examined the current inclusionary practices at a Central Coast High School. California State Standardized Assessment scores of 11th grade English Language Art and Math classes were also analyzed by groups. Overall, findings indicated that inclusionary practices were implemented to different degrees, but none were fully in place i.e., practices building relationships was rated the highest and instructional practices was rated lowest. In …

Relational Trust Within An Urban Public Comprehensive High School District In Northern California, Shawn Tennenbaum

Dissertations

The 2013 adoption of the Local Control Funding Formula and Local Control Accountability Plan provides local communities and districts with educational decision-making and provides a roadmap of how to improve outcomes in low-performing districts. One of the eight-priority areas California public school districts are held accountable to make progress on an annual basis is improving school climate. Building strong trust based relationships prepares schools to address a myriad of complex challenges. This dissertation examined the key facets that build relational trust between high school teachers and principals within a hierarchical role relationship in a public comprehensive high school district in …

Building Teacher Self-Efficacy Through Administrator Feedback, Limary Trujillo Gutierrez

Dissertations

The study explored current site principals’ feedback practices that support or hinder teachers’ implementation of feedback, and identified site principal’s practices that encourage or interfere with teacher’s self-efficacy. Using qualitative interviews with site principals and teachers from two different districts and three different school sites, the study analyzed two major leadership practices: (a) an administrator’s ability to communicate effectively with teachers before, during, and after the feedback process, and (b) an administrator’s use of emotional intelligence when providing feedback. Data were separated into four feedback types (positive feedback, negative feedback, feedback and feedforward) and emotional intelligence traits (self-regulation, self-aware, empathy, …

Predictors Of First Semester Baccalaureate Nursing Student Academic Success, Julie Twidwell

Dissertations

Accreditation standards, such as those of the American Association of Colleges of Nursing Commission on Collegiate Nursing Education’s program indicators, require pre-licensure programs of nursing to report outcome metrics which includes program completion rates. In response to regulatory requirements and accreditation standards, pre-licensure programs of nursing have an interest in selecting applicants most likely to meet outcomes standards. Attrition is a serious issue with implications for students, pre-licensure programs of nursing, the nursing workforce, and populations requiring nursing care. Academic failure due to insufficient cognitive aptitude often contributes to the attrition rate. Pre-licensure programs of nursing may consider interviews, essays, …

Estimating Wasi Iq Scores To Assist In Identifying Elementary School Gifted Students, Debra Garrett Pregler

Dissertations

Identifying gifted students early is important so they may receive adaptations in their learning environment including admittance into gifted programs (Subotnik, Olszweski-Kubilius, & Worrell, 2012). An effective method to increase the likelihood of identifying gifted students is needed (Pfeiffer, 2003). Admission at the elementary level primarily uses the individually-administered intelligence test; yet, the test is only administered to students nominated to the gifted program. The purpose of this study was to determine if individually-administered IQ test scores were related to specific information available to the elementary school counselor to aid in the determination of unidentified gifted elementary school students who …

A Mixed Methods Comparative Analysis Of The Implementation Of The Multi-Tiered Systems Of Support In Missouri Elementary Public Schools, Laura Smith

Dissertations

This study consisted of a mixed-methods comparative analysis of the implementation of the Multi-Tiered Systems of Support (MTSS) in public school districts in the state of Missouri. The researcher surveyed nine public school districts similar in demographics of socio-economic representation, free and reduced lunch percentage, and average daily fund expended to educate students. One district administrator responsible for the implementation of MTSS represented each school district. In the qualitative component of the study, the researcher utilized an original electronic survey to gather insights into the unique implementation path each district employed. Coding and analysis resulted in identification of themes, similarities, …

A 3d Simulation Of Leukocyte Adhesion In Blood Flow, Tai-Hsien Wu

Dissertations

It has been widely acknowledged that further understanding about the dynamics between blood cells and blood flow can help us gain more knowledge about the causes of diseases and discover more effective treatments. Examples of such dynamics include red blood cell (RBC, or erythrocyte) aggregation, white blood cell (WBC, or leukocyte) margination, and WBC extravasation. WBC extravasation is an important multiple-step process in the inflammatory response and therefore has drawn considerable attention over the past two decades. In this multiple-step process, a WBC undergoes at least four steps, including capture, rolling, firm adhesion, and transmigration, and each step is influenced …

Graceful Colorings And Connection In Graphs, Alexis D. Byers

Dissertations

For a graph G of size m, a graceful labeling of G is an injective function f : V (G) → {0, 1, . . . , m} that gives rise to a bijective function f ¹ : E(G) → {1, 2, . . . , m} defined by f ¹(uv) = |f (u) − f (v)|. A graph is graceful if it has a graceful labeling. Over the years, a number of variations of graceful …

Detection Of Bedrock Fractures And Joints Beneath Cover: Geophysical Approaches To An Engineering Geology Problem, Muthanna Yousif Yaqoob Aldiney

Dissertations

This research used geophysical methods to detect the presence of sub-vertical failure planes, their direction(s), and their frequency in bedrock beneath soil or glacial drift overburden. Azimuthal measurements using the seismic, electrical resistivity (ER), and electromagnetic conductivity were made to evaluate which techniques might provide the best indication of the bedrock joints, faults, or shear zones. Measurements were made at multiple sites near each of three locations: Jackson, Alpena, and Grand Ledge, Michigan. The first two are former limestone quarries and the third is underlain by sandstone. Seismic measurements began with one or two linear refraction spreads, used to establish …

Three Essays On Asset Price Bubbles, Frank Ofori-Acheampong

Dissertations

This dissertation examines various issues associated with asset price bubbles. In the first essay, a Markov regime-switching model with time-varying transition probabilities is developed to identify asset price bubbles in the S&P 500 Index. The model nests two different methodologies; a state-dependent regime-switching model and a Markov regime-switching model. Three bubble regimes are identified; dormant, explosive, and collapsing. Time-varying transition probabilities are specified for each of the nine possible transitions in the Markov regime-switching model. Estimation of the model is done using conditional maximum likelihood with the Hamilton filter. Results show that transition probabilities depend significantly on trading volume and …

Nanojars: Versatile Platform For Pyrazole Synthesis And Chemistry, And Selective Extraction Of Anions, Basil Mohammed Ahmed

Dissertations

This work is centered around nanojars, a family of nano-sized anion-incarcerating agents. It addresses various aspects of nanojar chemistry, such as synthesis strategies (including green methodologies) for pyrazole ligands needed for the preparation of nanojars, characterization and study of the mechanism of assembly of nanojars, and selective extraction of anions from water using nanojars.

Nanojars are neutral, supramolecular coordination complexes of the general formula [anion⊂ {Cu(μ-OH)(μ-pz)}_n], formed by the reaction of Cu²⁺, HO^‒ and pyrazolate ions (C₃H₂N₂‒, pz^‒) in the presence of oxoanions with large hydration energy …

Deterioration Prediction Modeling For The Condition Assessment Of Concrete Bridge Decks, Aqeed Moshin Chyad

Dissertations

Bridges are key elements in the US transportation system. There are more than six hundred thousand bridges on the highway system in the United States. Approximately one third of these bridges are in need of maintenance and will cost more than $120 billion to rehabilitate or repair. Several factors affect the performance of bridges over their life spans. Identifying these factors and accurately assessing the condition of bridges are critical in the development of an effective maintenance program. While there are several methods available for condition assessment, selecting the best technique remains a challenge. Therefore, developing an accurate and reliable …

Optimized Insulation And Filter Design Of Rotating Machines Fed By Fast Front Pulses, Mohammed Khalil Hussain

Dissertations

AC rotating machines are exposed to fast front pulses when fed from inverters. This type of excitation produces dielectric stress in the machine’s insulation system that can result in premature deterioration or even failure.

In this dissertation, a non-uniform transmission line model to predict the transient voltage distribution in a machine coil under steep-fronted surge conditions is described and implemented. This model is a function not only of frequency but also of space to represent the variation of electrical parameters in the overhang and slot regions of the coil. These parameters are computed using the finite element method. In order …

Exploring The Role Of Semi-Supervised Deep Reinforcement Learning And Ensemble Methods In Support Of The Internet Of Things, Mehdi Mohammadi

Dissertations

Smart services are an important element of the Internet of Things (IoT) ecosystem where insights are drawn from raw data through the use of machine learning techniques. However, the pathway to develop IoT smart services is complicated as IoT data presents several challenges for machine learning, including handling big data, shortage of labeled data, and the need to benefit from the spatio-temporal relations hidden in the training data.

In this dissertation, after reviewing the state-of-the-art deep learning (DL) and deep reinforcement learning (DRL) techniques and their use in support of IoT applications, this study proposes to extend DRL to semi-supervised …

The Bellringer Sequence: Investigating What And How Preservice Mathematics Teachers Learn Through Pedagogies Of Enactment, Mary A. Ochieng

Dissertations

This study examines preservice teacher learning through pedagogies of enactment—approaches to teacher education that allow preservice teachers to learn by doing what teachers do. Preservice teacher (PST) learning is examined through the implementation of the Bellringer Sequence (BRS), a pedagogy of enactment conceptualized in the study. The BRS is centered around bellringers—brief mathematical tasks implemented as students arrive for class. The BRS is a sequence of four activities centered on a bellringer: preparation (for teaching a bellringer) implementation (of the bellringer with peers), debriefing (discussing the implementation as colleagues), and written reflection (about the effectiveness of the bellringer).

Practice-based approaches …

The Catholic Church And Its Impact On Public Policy In Contemporary Democracies, Dawid Tatarczyk

Dissertations

The overarching aim of this dissertation was to examine the extent to which the Catholic Church is still a significant public policy actor in 35 economically developed democracies. The research design used in this project draws on three distinct approaches, each addressing a different puzzle but when integrated together they provide an answer to the main question. Taken together these three approaches show that the Catholic Church continues to be an important political institution with considerable influence even in economically developed democracies.

The rational choice institutionalism paradigm is used to explain the political behavior of the Catholic Church. The paradigm …

The Effects Of Peer Observation On Teacher Intervention Integrity, Garrett D. Warrilow

Dissertations

The observer effect is a term used to describe a process during which an observer's behavior changes as they measure the behavior of another individual. The observer effect has been widely studied in organizational behavior management but has limited research with teachers in schools. The current study sought to use the observer effect as part of a teacher training package by evaluating the effects of peer observations on an observing teacher's implementation integrity of components of a Positive Behavioral Interventions and Supports (PBIS) system. Participants were four middle school teachers of students in general education classrooms. The primary dependent variables …

Induced Graph Colorings, Ian Hart

Dissertations

An edge coloring of a nonempty graph G is an assignment of colors to the edges of G. In an unrestricted edge coloring, adjacent edges of G may be colored the same. If every two adjacent edges of G are colored differently, then this edge coloring is proper and the minimum number of colors in a proper edge coloring of G is the chromatic index χ^/(G) of G. A proper vertex coloring of a nontrivial graph G is an assignment of colors to the vertices of G such that every two adjacent vertices of …

An Integrated Decision Support Framework For Life-Cycle Building Asset Management, Maha Reda Alkasisbeh

Dissertations

Building assets are essential to the economic, cultural, and historical growth of any nation. Examples of buildings include shelters, entertainment facilities, living spaces, teaching facilities, civil offices, parking structures, police buildings, libraries, and service areas used to accommodate human activity. Deterioration of building assets, inadequate renewal budgets, climbing deficits, and increasing demand levels are difficulties that face owners when managing building assets. The role of asset management has recently become significant in municipal governments for strategic, operational, and financial reasons. The main functions of an asset management system include assessment of the current condition, prediction of future deterioration, asset prioritization, …

A Policy Advocating For Turnaround Reform To Improve Failing Schools: Policy Advocacy Document, Kenyatta Starks

Dissertations

ABSTRACT

I am advocating for the districts to adopt Turnaround reform. This reform would be available to all schools that are considered failing in the district and not showing sufficient academic improvement. The district has implemented many initiatives to reform schools including turnaround. The implication and effectiveness of turnaround reform if done with fidelity and monitoring can be successful. There is ample research that supports turnaround reform and the positive academic gains and improvement in discipline, attendance, and teacher quality. My research and experience in this work has led me to understand that specific concept are vital to Turnaround success, …

Borehole Communication Via Drill Strings In Oil Wells, Ali Hamdan Alenezi

Dissertations

The performance of multichannel and single channel accelerometers used as uphole communication receivers is studied. Using measured channels from the drill string testbed, it is shown that one tri-axial accelerometer can provide nearly uncorrelated signals when compared to two single channel accelerometers. Having uncorrelated signals at the uphole receiver provides a diversity which in turn can lead to an increase in the communication system performance. The use of a strain sensor as a receiver in borehole communication is proposed. Using measured channels from the drill string testbed, the performance of a strain receiver with a single-accelerometer receiver is compared. The …

Secure Entity Authentication, Zuochao Dou

Dissertations

According to Wikipedia, authentication is the act of confirming the truth of an attribute of a single piece of a datum claimed true by an entity. Specifically, entity authentication is the process by which an agent in a distributed system gains confidence in the identity of a communicating partner (Bellare et al.). Legacy password authentication is still the most popular one, however, it suffers from many limitations, such as hacking through social engineering techniques, dictionary attack or database leak. To address the security concerns in legacy password-based authentication, many new authentication factors are introduced, such as PINs (Personal Identification Numbers) …

Survival Analysis Using Archimedean Copulas, Xieyang Jia

Dissertations

This dissertation has three independent parts. The first part studies a variation of the competing risks problem, known as the semi-competing risks problem, in which a terminal event censors a non-terminal event, but not vice versa, in the presence of a censoring event which is independent of these two events. The joint distribution of the two dependent events is formulated under Archimedean copula. An estimator for the association parameter of the copula is proposed, which is shown to be consistent. Simulation shows that the method works well with most common Archimedean copula models.

The second part studies the properties of …