Digital Commons Network^™

Modeling Transmission Of Photonic Crystal Waveguide Modes Enhanced By Kerr Nonlinearity, Buddhi M. Rai

Dissertations

Nonlinear modes of electromagnetic fields propagating in photonic crystal systems have been studied by implementing various computer simulation techniques using electromagnetic theory. The fundamentals of simulation of photonic crystals are analyzed using general purpose methodologies such as the FDTD or PWE methods. Information derived from the underlying physical insights into the systems could be utilized to describe the control mechanisms over the propagation of the modes around impurities in the photonic crystal lattice. The impurities trap the resonantly localized electromagnetic modes having a frequency in a stop band of the photonic crystal, suggesting novel optical controls in the photonic crystal …

Using The Good Behavior Game To Decrease Disruptive Behavior While Increasing Academic Engagement With A Headstart Population, Brandy Marie Hunt

Dissertations

The Good Behavior Game (GBG) has been widely supported as an effective intervention to alter a variety of target behaviors, in various settings, with varying age groups; however, there are areas warranting further investigation. Prior to the present study, no study has examined the GBG’s effectiveness in decreasing disruptive behaviors while increasing appropriate academic behaviors within a preschool population. The present study adds to the literature base by investigating the GBG’s effectiveness in simultaneously decreasing classroom disruptive behaviors while increasing appropriate behaviors. A multiple baseline design across three Headstart classrooms was used to evaluate the effectiveness of the GBG on …

Investigating The Biochemical Activity Of Some Flavonoids, Coumarins And Modified Gold-Nanoparticles As Anti-Breast-Cancer Agents, Amr Ezzat Mohamed Mahmoud

Dissertations

Polyphenols compounds are abundant natural products found in many plants as secondary metabolites. These compounds display many interesting pharmacological activities, which have motivated chemists over the years to explore them, and their synthetic derivatives, as potential drugs, especially anticancer drugs. Breast cancer is the most common cancer in women globally, and in the United States of America the estimated worldwide new breast cancer cases and the number of deaths are 1.38 million and 458 thousand, respectively. Currently in the USA there are 2.6 million women who have been treated for breast cancer, and the estimated number of deaths are 39,520 …

Describing The Apprenticeship Of Chemists Through The Language Of Faculty Scientists, Brandy Ann Skjold

Dissertations

Attempts to bring authentic science into the K-16 classroom have led to the use of sociocultural theories of learning, particularly apprenticeship, to frame science education research. Science educators have brought apprenticeship to science classrooms and have brought students to research laboratories in order to gauge its benefits. The assumption is that these learning opportunities are representative of the actual apprenticeship of scientists. However, there have been no attempts in the literature to describe the apprenticeship of scientists using apprenticeship theory. Understanding what science apprenticeship looks like is a critical component of translating this experience into the classroom. This study sought …

A Study Of Factors Related To Teacher Attrition, Leslie Ann Beaugez

Dissertations

This study examined factors related to teacher attrition. The purpose of this study was to determine whether the level of teacher satisfaction that could motivate a teacher to remain in the profession in a national sample could be predicted from selected factors. Furthermore, this study examined teachers’ perceptions of worry/stress based on student performance on state and/or local tests.

The participants in the study were in two groups: teachers in a national sample that responded to items on the 1999-2000 Schools and Staffing Survey and certified teachers from a southeastern school district who also responded to one of the items …

Social Networking Systems As A Vehicle To Promote Sense Of Community And Performance In Online Classes, Jonathan Mark Woodward

Dissertations

Academicians are navigating through the intersection of information technology and social change. The path that educators choose will help determine the future of higher education in traditional and online settings. The journey of teachers is clouded by the abundance and rapid creation of emerging technologies, but the trends of Net Generation students offer direction. Among Web 2.0 applications, social networking systems (SNSs) offer students a new approach to communicating, learning, and collaborating.

The sociocentric view of knowledge and learning and the theories of Vygotsky and Dewey are helping to drive educators to look for a solution to a missing link …

Analysis Of The Impact Of Implementing Interdisciplinary Pods On Student Achievement In Georgia Middle Schools, Andrew Lynn Bristow

Dissertations

With the increasing demands for middle schools to meet Annual Yearly Progress and the Annual Measurable Objective levels of the No Child Left Behind Act (2002) middle school principals are faced with decisions to incorporate the appropriate middle school instructional model. This study examined the longitudinal achievement data of sixth and seventh grade reading, English language arts, and math on the Georgia Criterion Reference Competency Test (CRCT) in 20 middle schools from 2008 – 2011 in a large suburban school district in Georgia. Of the schools, two implemented a junior high model, six implemented an interdisciplinary pod model, and twelve …

Interpretations Of Student Engagement In The Context Of The Orff Schulwerk Music Classroom At The Dubard School For Language Disorders, Anna Rebecca Bondurant Halliday

Dissertations

The purpose of this multiple case study was to explore the lived experiences of four students with language disorders within the context of their Orff Schulwerk music class at the DuBard School for Language Disorders. In addition, the observational insights of their classroom teachers and the practitioner researcher were compared with the responses of the students in order to determine any discrepancies between the child’s awareness of his or her musical engagement and that of the observer. Using data collected from interviews, stimulated recall (Dempsey, 2010), and student generated artwork (Freeman & Mathison, 2009), I explored the lived experiences of …

Factors Related To Student Performance In Statistics Courses In Lebanon, Hiba Salim Naccache

Dissertations

The purpose of the present study was to identify factors that may contribute to business students in Lebanese universities having difficulty in introductory and advanced statistics courses. Two statistics courses are required for business majors at Lebanese universities. Students are not obliged to be enrolled in any math courses prior to taking statistics courses. Drawing on recent educational research, this dissertation attempted to identify the relationship between (1) students’ scores on Lebanese university math admissions tests; (2) students’ scores on a test of very basic mathematical concepts; (3) students’ scores on the survey of attitude toward statistics (SATS); (4) course …

Empirical Identification Of Axis I And Axis Ii Symptom Subtypes Of Sex Addiction Using Lateny Profile Analysis, Maria Isabel Nino De Guzman

Dissertations

Sexual addiction is a disorder characterized by lack of control over sexual urges, pathological relationships and lack of intimacy, mood-altering experiences, and adverse consequences that tend to be disregarded by the person affected. Although not classified as a mental disorder in the Diagnostic Statistical Manual-IV-TR (DSM-IV-TR, APA, 2000) this distressful sexual manifestation is increasingly recognized as a clinical and public health problem. Previous studies suggest commonalities with addictive disorders and maladaptive personality traits. The purpose of the current study was to analyze personality configurations of individuals diagnosed as sex addicts and uncover specific subtypes or profiles associated to sexually addictive …

Evaluating The Interpersonal Nature Of Humor: Mapping Humor Styles Onto The Interpersonal Circumplex, Jessica Erin Vaughan

Dissertations

The present study examined the interpersonal content of the four humor styles outlined in the Humor Styles Questionnaire in order to gather additional information about the interpersonal content of these humor styles. This was accomplished by projecting each of the humor styles onto the interpersonal circumplex. Each of the humor styles possessed significant interpersonal content and demonstrated interpersonal cohesion such that the maladaptive humor styles were located in the Cold-Hearted region and the adaptive humor styles were located in the adjacent octants of Gregarious- Extroverted and Warm-Agreeable. These findings suggest that the adaptive humor styles and maladaptive humor styles possess …

Obstructive Sleep Apnea And The Effects Of Co-Existing Factors On Pacu Stay Time, Shari F. Jones Phd, Crna

Dissertations

Significance/Background: Obstructive Sleep Apnea (OSA) is the most common disturbance during sleep affecting 30% of the population. The occurrence of moderate/severe OSA is 11.4% in men and 4.7% in women. OSA is caused by repetitive partial or complete obstruction of the upper airway with apnea episodes. OSA is prevalent in western society, yet is frequently undiagnosed due to lack of knowledge of the disorder. This population presents a challenge during the peri-operative period due to increased risk for several complications. Of particular interest to Nurse Anesthetists, are respiratory complications that result in delayed emergence from anesthesia, delayed post-operative recovery, increased …

The Effect Of School Based Intervention Processes On Secondary School Graduation Rates, Ben H. Yocom

Dissertations

The focus of this research is in the area of academic interventions and their effect on graduation rates in secondary schools in Missouri. In light of the regulations within the No Child Left Behind Act of 2001 and its accountability requirements for schools, this study is important and timely in order to provide valuable examples of effective intervention processes. The research approach adopted in this dissertation was a mixed methods approach; therefore, quantitative analysis was utilized during a statistical comparison of secondary schools in Missouri and a review of trends from a survey distributed to all secondary school principals in …

Implications Of The No Child Left Behind Legislation On Career And Technical Education, Thomas Kyle Wallace

Dissertations

The passage of No Child Left Behind (NCLB) legislation in 2001 brought about a multitude of education reform policies for education institutions that made the future of Career and Technical Education’s (CTE) role in secondary educations unclear. These mandates forced educational leaders to emphasize student enrollment in tracks that prepare them for post-secondary educational opportunities that require a stronger background in academic courses. The standards-based mandates required by NCLB legislation make promotion of CTE courses more difficult because these courses are primarily elective courses and have caused educational agencies to look at what CTE programs provide in terms of meeting …

An Investigation Of Relationships Between Body Mass Index And Factors Of Wellness Among Full-Time Employees At Private Kentucky Colleges And Universities, Christopher Schmidt

Dissertations

The United States is in the middle of a health epidemic that shows no signs of stopping. Obesity is a disease that carries a significant number of health-related issues. The adult population has experienced a decrease in overall wellness, where the mental and physical health of individuals is disrupted by the effects of obesity. Even more alarming is the rate of increase in childhood obesity and its impact on America’s future.

The consequences of this health epidemic are especially visible in the increased costs of health care caused by obesity-related diseases. This epidemic reaches across many aspects of life. The …

A Stochastic Delay Model For Pricing Corporate Liabilities, Elisabeth Kemajou

Dissertations

We suppose that the price of a firm follows a nonlinear stochastic delay differential equation. We also assume that any claim whose value depends on firm value and time follows a nonlinear stochastic delay differential equation. Using self-financed strategy and replication we are able to derive a random partial differential equation (RPDE) satisfied by any corporate claim whose value is a function of firm value and time. Under specific final and boundary conditions, we solve the RPDE for the debt value and loan guarantees within a single period and homogeneous class of debt. We then analyze the risk structure of …

A Dynamic Programming Approach To Identifying Optimal Mining Sequences For Continuous Miner Coal Production Systems, Joseph Christian Hirschi

Dissertations

Underground mines are the source of 33% of US coal production and 60% of worldwide coal production. Room-and-pillar mining with continuous miners has been the most common production system used in these mines since the 1960s. The introduction of continuous miners mechanized the underground coal mining industry triggering a period of sustained growth in mine productivity; however, productivity peaked at the turn of the century and has been in decline for a decade. Research on productivity in underground coal mines began at Southern Illinois University Carbondale in 2000 and led to development of a deterministic spreadsheet model for evaluating continuous …

Image Reconstruction And Imaging Configuration Optimization With A Novel Nanotechnology Enabled Breast Tomosynthesis Multi-Beam X-Ray System, Weihua Zhou

Dissertations

Digital breast tomosynthesis is a new technology that provides three-dimensional information of the breast and makes it possible to distinguish the cancer from overlying breast tissues. We are dedicated to optimizing image reconstruction and imaging configuration for a new multi-beam parallel digital breast tomosynthesis prototype system. Several commonly used algorithms from the typical image reconstruction models which were used for iso-centric tomosynthesis systems were investigated for our multi-beam parallel tomosynthesis imaging system. The representative algorithms, including back-projection (BP), filtered back-projection (FBP), matrix inversion tomosynthesis reconstruction (MITS), maximum likelihood expectation maximization (MLEM), ordered-subset maximum likelihood expectation maximization (OS-MLEM), simultaneous algebraic reconstruction …

Finding Voice From A Distance: Learning Voice In Writing Through Online Learning, Amy Marie Ade Peach

Dissertations

One of the primary objectives for many instructors of first-year composition (FYC) is to encourage students to use their own voice/persona, or express themselves with authority in their writing. While there are many pedagogical methods to address this in a face to face environment, there is now need to understand how the course tools and architecture in online versions of the course can facilitate “voice” in writing. This qualitative study observed a summer FYC (First Year Composition) course online at one institution in the Midwestern United States. At the conclusion of the course, two students and the instructors were interviewed …

The Relationship Between Multiplication Fact Speed-Recall And Fluency And Higher Level Mathematics Learning With Eighth Grade Middle School Students, Steven James Curry

Dissertations

This quantitative study investigated relationships between higher level mathematics learning and multiplication fact fluency, multiplication fact speed-recall, and reading grade equivalency of eighth grade students in Algebra I and Pre-Algebra. Higher level mathematics learning was indicated by an average score of 80% or higher on first and second semester mathematics assessments and proficient or advanced descriptor on the mathematics Missouri Assessment Program tests. Timed multiplication fact quizzes were administered to eighth grade students. Speed-recall scores were measured by the number of accurate answers in a 45-second time frame. Fluency was obtained by a student score of 35 accurate answers in …

Employment Of An Informal Educational Mathematical Facility To Lower Math Anxiety And Improve Teacher And Student Attitudes Towards Understanding Mathematics, Vicki Adams

Dissertations

Students do not pursue careers in science, technology, engineering, or mathematics (STEM) because of a lack of ability, but rather a lack of positive experiences with mathematics. Research has concluded that attitudes in math directly influence success in mathematics. As many as 75% of high school graduates in the United States suffer from mild to severe forms of math anxiety. The improvement of student achievement in mathematics in the United States lags behind that of many other nations in the world. Efforts to improve student achievement in mathematics have focused on developing effective teachers and teaching practices, creating state and …

Variations On A Graph Coloring Theme, Bryan Phinezy

Dissertations

Historically, the subject of graph colorings has been the most popular research area in graph theory. There are many problems in mathematics and in real life that can be represented by a graph and whose solution involves finding a specific coloring of this graph. Our research consists of two parts: (1) combinatorial problems and vertex colorings and (2) distance-defined colorings. In this research, we show that certain combinatorial puzzles and problems can be placed in a graph coloring setting and graph colorings can be defined in terms of distance in graphs that are useful in applications.

Two vertices u and …

Beyond The Dream:Improving College-Readiness Of Underprepared Community College Students, Joan L. Kindle

Dissertations

The majority of the nation’s first-year college students are not prepared to assume postsecondary level studies. Many are diverted to developmental education programs and most never attain postsecondary credentials. Educational reform is on the national agenda and challenges community colleges to address the growing lack of postsecondary achievement. The purpose of this instrumental multi-case study was to explore and analyze reformative strategies that effectively address college-readiness and achievement of underprepared community college students.

A qualitative methodology was employed in analyzing strategies implemented at community colleges to improve college-readiness. A criterion-based selection process identified six community colleges recognized by the Achieving …

Paleoclimatic Regimes Of The African Sahara Desert During Pleistocene And The Origin Of Groundwater In The Nubian Sandstone Aquifer System, Abdou A. Abouelmagd

Dissertations

This study involves an integrated three-fold approach to better understand the paleoclimatic regimes over the North African Sahara Desert with emphasis on the origin of groundwater in the Nubian Sandstone Aquifer System. Specifically, the nature and origin of the paleo-wind regimes that produced the precipitation that recharged the fossil aquifers in North Africa in the previous wet climatic periods are deciphered using inferences from stable isotope data, noble gases, remote sensing and GIS.

In the first phase, the progressive depletion trend of stable isotopic composition in the fossil groundwaters under influence of paleowesterlies across North African Sahara Desert is simulated …

Design, Modeling And Fabrication Of Shear Mode Bulk Acoustic Wave Sensor As A Potential Biosensor, Chi-Jung Cheng

Dissertations

There has been an increasing interest in development of thin film bulk acoustic wave resonator (FBAR) devices for chemical and biological sensing applications in the environmental and biomedical industries. The zinc oxide (ZnO) thin film based FBAR devices provides attractive advantages, such as high resonant frequency, small size, and rapid response. Typically, the ZnO-based FBAR devices are operated in the longitudinal wave mode where the ZnO crystallites are perpendicular to the substrate. In gaseous environments, the longitudinal mode FBAR device provides high sensitivity for mass sensing. However, the longitudinal wave mode is adversely affected when used in liquid environments because …

Rank-Based Estimation And Prediction For Mixed Effects Models In Nested Designs, Yusuf K. Bilgic

Dissertations

Hierarchical designs frequently occur in many research areas. The experimental design of interest is expressed in terms of fixed effects but, for these designs, nested factors are a natural part of the experiment. These nested effects are generally considered random and must be taken into account in the statistical analysis. Traditional analyses are quite sensitive to outliers and lose considerable power to detect the fixed effects of interest.

This work proposes three rank-based fitting methods for handling random, fixed and scale effects in k-level nested designs for estimation and inference. An algorithm, which iteratively obtains robust prediction for both scale …

Adaptive Security-Aware Scheduling For Packet Switched Networks Using Real-Time Multi-Agent Systems, Ma'en Saleh Saleh

Dissertations

Conventional real-time scheduling algorithms are in care of timing constraints; they don’t pay any attention to enhance or optimize the real-time packet’s security performance. In this work, we propose an adaptive security-aware scheduling with congestion control mechanism for packet switching networks using real-time agentbased systems. The proposed system combines the functionality of real-time scheduling with the security service enhancement, where the real-time scheduling unit uses the differentiated-earliest-deadline-first (Diff-EDF) scheduler, while the security service enhancement scheme adopts a congestion control mechanism based on a resource estimation methodology.

The security service enhancement unit was designed based on two models: singlelayer and weighted …

A Discriminative Imaging-Based Framework For Road Sign Condition Assessment Using Local Features And Svm Classifiers, Jafar Jameel Abukhait

Dissertations

Transportation departments are required to monitor the condition of road signs through appropriate condition assessment mechanisms to improve road safety and keep drivers properly informed. Typically, these mechanisms include visual inspection or specialized equipment such as retroreflectometers. These methods are costly, tedious, and risky since they need direct contact with road signs. Efforts to use emerging computer vision techniques for the assessment of road signs condition combined with the availability of road data inventories are allowing the automation of these processes, thus easing the inspection process, reducing costs of equipment, and decreasing the risks associated with the need for maintenance …

Study Of The Structure Of 9C Via Single Neutron Transfer, Scott T. Marley

Dissertations

This thesis describes a study of the nucleus ⁹C, produced in the single-neutron transfer reaction d(¹⁰C, t) ⁹C using a radioactive ¹⁰C beam. The structure of the neutron-deficient nucleus ⁹C is poorly known. Only a few excited states have been observed and no information exists of their single-particle characteristics. The measured ground-state magnetic dipole moment of ⁹C is anomalously small and could imply large contributions from sd-shell orbitals in the ground-state wave function. The positions of the ⁹C excited states and their single-particle properties are vital to furthering the …

Understanding Burnout And Promoting Engagement Among Adjunct Faculty In Community Colleges, Michael Alan Bates

Dissertations

This mixed methods study explored the phenomenon of job burnout among adjunct faculty at two suburban Illinois community colleges. The Maslach Burnout Inventory – Educators’ Survey (MBI-ES) was administered to adjuncts at both colleges to determine overall levels of burnout for the three dimensions of burnout – emotional exhaustion, depersonalization, and lack of personal accomplishment. The results of the MBI-ES also allowed differences in burnout levels based on selected employment characteristics and teaching disciplines to be examined. Qualitative methods, specifically semi-structured interviews and document review, provided further insight into these areas. Qualitative methods were also used to investigate the risk …