Digital Commons Network^™

Global Optimization Methods For Localization In Compressive Sensing, Marco Rossi

Dissertations

The dissertation discusses compressive sensing and its applications to localization in multiple-input multiple-output (MIMO) radars. Compressive sensing is a paradigm at the intersection between signal processing and optimization. It advocates the sensing of “sparse” signals (i.e., represented using just a few terms from a basis expansion) by using a sampling rate much lower than that required by the Nyquist-Shannon sampling theorem (i.e., twice the highest frequency present in the signal of interest). Low-rate sampling reduces implementation’s constraints and translates into cost savings due to fewer measurements required. This is particularly true in localization applications when the number of measurements is …

Fwer Controlling Procedures For Testing Multiple Hypotheses With Hierarchical Structure And Applications In Clinical Trials, Zhiying Qiu

Dissertations

In applications of clinical trials, the hypotheses to be tested often exhibit a hierarchical structure, and are usually hierarchically ordered based on their importance, clinical relevance, or dose concentration, etc. Thus, they are tested in a pre-defined fixed sequence. In some more complex cases, the hypotheses to be tested are hierarchically grouped into several families, and thus the families are tested in a sequential order. Although such problems of structured multiple testing have received much attention and several popular FWER controlling procedures, such as conventional fixed sequence procedure, fallback procedure and gatekeeping procedure have been introduced, not much progress has …

Computational Methods For The Analysis Of Next Generation Sequencing Data, Wei Wang

Dissertations

Recently, next generation sequencing (NGS) technology has emerged as a powerful approach and dramatically transformed biomedical research in an unprecedented scale. NGS is expected to replace the traditional hybridization-based microarray technology because of its affordable cost and high digital resolution. Although NGS has significantly extended the ability to study the human genome and to better understand the biology of genomes, the new technology has required profound changes to the data analysis. There is a substantial need for computational methods that allow a convenient analysis of these overwhelmingly high-throughput data sets and address an increasing number of compelling biological questions which …

Investigation Of New Feature Descriptors For Image Search And Classification, Atreyee Sinha

Dissertations

Content-based image search, classification and retrieval is an active and important research area due to its broad applications as well as the complexity of the problem. Understanding the semantics and contents of images for recognition remains one of the most difficult and prevailing problems in the machine intelligence and computer vision community. With large variations in size, pose, illumination and occlusions, image classification is a very challenging task. A good classification framework should address the key issues of discriminatory feature extraction as well as efficient and accurate classification. Towards that end, this dissertation focuses on exploring new image descriptors by …

Characterizing Motor Control Signals In The Spinal Cord, Yi Guo

Dissertations

The main goal of this project is to develop a rodent model to study the central command signals generated in the brain and spinal cord for the control of motor function in the forearms. The nature of the central command signal has been debated for many decades with only limited progress. This thesis presents a project that investigated this problem using novel techniques. Rats are instrumented to record the control signals in their spinal cord while they are performing lever press task they are trained in. A haptic interface and wireless neural data amplifier system simultaneously collects dynamic and neural …

Physical Controls On Water Flow And Solute Transport In Coastal Aquifers, Xiaolong Geng

Dissertations

Groundwater flow and associated subsurface solute fates have a significant impact on the structure and productivity of near-shore coastal ecosystems. For proper assessment and management of these coastal groundwater resources, it is quite essential to investigate the key factors (tides, waves, evaporation, and freshwater recharge etc.) affecting coastal groundwater systems. The main objective of this study is to examine and quantify two important physical control factors, oceanic waves and evaporation, on the groundwater flow and solute transport in near-shore aquifers. For the investigation of wave effects, a Computational Fluid Dynamics (CFD) modeling tool, Fluent, is used to simulate wave- induced …

Field Methods For Rapidly Characterizing Contaminant Mobility In Paint Waste During Bridge Rehabilitation, Zhan Shu

Dissertations

Currently, the New York State Department of Transportation (NYSDOT) uses a conservative approach of classifying all paint waste as hazardous from bridges undergoing rehabilitation which were constructed before 1989. This practice stems from the fact that there is no approved reliable, fast, and efficient method for classifying paint waste in-situ as non-hazardous. The main objective of this study was to develop a model that can predict the leachability of trace metals in paint waste generated during bridge rehabilitation. A statistically significant number of bridge sites were sampled based on hypothesis testing. Samples were then evaluated for total concentration of Resource …

Analysis Of Far-Infrared Optical Spectra Of Multiferroics, Eric C. Standard

Dissertations

The optical spectra of multiferroic crystals Dy₃Fe₅O₁₂, Tb₃Fe₅O₁₂, and four hexagonal RMnO₃ (5D= Er, Tm, Yb, Lu) are studied using intense bright synchrotonic light in the infrared spectral range. In regards to the materials analyzed, two rare earth iron garnets and four rare earth manganites in total are examined. These materials have attracted much attention due to their interesting magnetoelectric properties. They could serve as the basis for the next generation of faster and more energy efficient memory and logic devices. To examine these materials, two …

Nanocarbon Immobilized Membrane For Separation And Analysis, Madhuleena Bhadra

Dissertations

Membrane processes classically cover a wide range of applications associated with various aspects of separation and purification. Over the last few years, membrane based processes have received much interest due to their compact and modular architecture, low energy consumption and cost effective separation. With the development of diverse nanomaterials which can serve as nanosorbents, or provide specific morphology for selective solute transport, recent years have witnessed the emergence of nanocarbon based membranes that can address some of the limitations of conventional membrane processes and make feasible the next generation of breakthroughs.

The objective of this research is the exploration of …

Inverse Methods For Sound Speed Estimation In The Ocean, Tao Lin

Dissertations

This dissertation presents theoretical and computational approaches for estimating sound-speed in the ocean under different conditions. The first part of the dissertation discusses a fast approach for solving the inverse problem of estimating sediment sound-speed based on the Deift-Trubowitz trace formula. Under certain assumptions, this algorithm can recover the sound speed profile in the seabed using pressure field measurements in the water column at low frequencies. The inversion algorithm requires solving a non-linear integral equation. In the past, Stickler and Zhou employed a first order Born approximation for solving the integral equation. This work introduces two new methods. The first …

Modeling, Control And Simulation Of Control-Affine Nonlinear Systems With State-Dependent Transfer Functions, Roger Kobla Kwadzogah

Dissertations

There has been no known research that applies nonlinear transfer function to a nonlinear control problem. The belief is that nonlinear systems have no transfer functions. The Laplace transformation required to define transfer functions is not tractable mathematically when the coefficients of the differential equation are functions of state, output and control variables. In other words, it is not defined for systems that do not obey principles of superposition. Only linear systems obey this principle. Therefore, this dissertation work represents the very first research to demonstrate how transfer functions can be used to represent and design feedback control for nonlinear …

Dynamics Of 1d Granular Column, Luo Zuo

Dissertations

This dissertation is focused on a discrete element study of the dynamics of a one- dimensional column of inelastic spheres that it subjected to taps by prescribing a half sine wave pulse to supporting floor. Contact interactions obey the Walton-Braun soft-sphere model in which the loading (unloading) path is governing by linear springs of stiffness K1, thereby producing col lisional energy loss through a constant restitution coefficient e. Over a ‘short time scale’, computations are done to examine the floor pulse wave as it propagates through the column contact network. Comparisons of the simulated findings are made with experimental measurements …

Optimization Of Vehicle Routing And Scheduling With Travel Time Variability - Application In Winter Road Maintenance, Haifeng Yu

Dissertations

This study developed a mathematical model for optimizing vehicle routing and scheduling, which can be used to collect travel time information, and also to perform winter road maintenance operations (e.g., salting, plowing). The objective of this research was to minimize the total vehicle travel time to complete a given set of service tasks, subject to resource constraints (e.g., truck capacity, fleet size) and operational constraints (e.g., service time windows, service time limit).

The nature of the problem is to design vehicle routes and schedules to perform the required service on predetermined road segments, which can be interpreted as an arc …

A Study Of Missouri's Educator Evaluation System And Its Efforts To Increase Teacher And Leader Effectiveness, Paul J. Katnik

Dissertations

This pilot project study explored the relationship between the newly created Educator Evaluation System by the Department of Elementary and Secondary Education in Missouri and a change in the professional performance of teachers and leaders. In particular, it addressed whether the process articulated in the state’s new model resulted in a positive change in an educator’s performance ultimately leading to improvements in student learning. A detailed review of the state’s model is provided along with the research that supports the need for each step in the process. The pilot project conducted is described and data are reviewed from the participating …

Basis Function Approaches For Two Dimensional Cochlear Models, Lihua Li

Dissertations

The human cochlea possesses the amazing ability of analyzing audio signals. The structures and mechanisms behind its characteristic response to sound stimuli has been an active area of research for decades. It has been demonstrated that mathematical cochlear modeling poses a promising alternative to discover the elusive activities in an in vivo cochlea. However, despite the successful application of numerical methods such as the Wentzel-Kramers-Brillouin (WKB) method, finite difference method (FDM) and finite element method (FEM), the critical effects of the choice of basis functions have not been studied exclusively for the numerical solutions of cochlea models. This work presents …

Researching The Real: Transforming The Science Fair Through Relevant And Authentic Research, Rosemary Mcbryan Davidson

Dissertations

This teacher research study documents the processes used to help students in an all-female, religious-based high school create science fair projects that are personally meaningful, scientifically sophisticated and up-to date in terms of science content. One-hundred sixteen young women in an honors chemistry class were introduced by their teacher to the methods used by science journalists when researching and crafting articles. The students then integrated these strategies into their science fair research through collaborative classroom activities designed by their teacher. Data collected during the process included audio and video tapes of classroom activities, student interviews, process work, finished projects, email …

School Climate And Building Highly Effective Schools: How Student Perception Of School Structure And Supportive Learning Environments Affect Their Enjoyment Of School, Amber D'Nay Simpson

Dissertations

Education reformers have long sought to apply scientific framework analysis to engineer the ideal system in which both students and teachers are highly successful. Grounded in the evidence based theoretical framework of Social and Emotional Learning (SEL), many academicians and practitioners are now focusing on determinants of school structure and supportive learning environments to bolster students’ enjoyment of school, which supports increased positive outcomes. The Abbreviated School Climate Survey (Student Version) (Ding, Liu and Berkowitz, 2011) instrument was designed to explore student perspective of school climate as an indicator of student outcomes based on seven variables. The purpose of this …

An Analysis Of Acculturative Stress, Sociocultural Adaptation, And Satisfaction Among International Students At A Non-Metropolitan University, Hajara Mahmood

Dissertations

This quantitative descriptive study was designed to analyze levels of acculturative stress and sociocultural adaptation among international students at a non-metropolitan university in the U.S. in relation to college satisfaction and certain demographic characteristics. Surveys were used to measure international students’ levels of acculturative stress, sociocultural adaptation, including five subscales of sociocultural adaptation, and college satisfaction (N = 413). Demographic questions included gender, age, country of origin, length of stay in the U.S., degree level, and English language comfort. Results indicated a negative correlation between students’ levels of sociocultural adaptation and acculturative stress. In particular, increased competency among the five …

This Animal, Elena Therese Tomorowitz

Dissertations

This Animal is a poetic narrative about humans’ animalistic instincts and how we use them to navigate our relationships with others and the world around us.

The Effects Of Universal Design For Learning On The Academic Engagement Of Middle School Students, Kimberly M. Johnson-Harris

Dissertations

A multiple baseline across participants design was used to examine the impact of Universal Design for Learning (UDL), implemented as a total framework, on the academic engagement of middle school students with emotional or behavioral disorders (EBD), and students who are at-risk for academic failure due to behavior problems, who are included in general education classes. Five teachers from two middle schools participated in professional development on UDL and UDL lesson plan design and then implemented UDL lessons in their classes. Data were collected on the fidelity of UDL implementation, student academic engagement during lesson plan implementation, and teacher acceptability …

An Exponentiality Test Using A Modified Lilliefors Test, Achut Prasad Adhikari

Dissertations

No abstract provided.

The Effects Of Formative Assessment On Students' Zone Of Proximal Development In Introductory Calculus, Rebecca-Anne Dibbs

Dissertations

No abstract provided.

The Connection To Improved Student Performance For Teacher Experience And Advanced Degree Completion Above Bachelor’S Level, Jared Flay Terry

Dissertations

Educational leaders and experts claim that teachers are the number one classroom factor in the educational success of students (Marzano, 2007; Wong, 2009). This study determined there was not a significant correlation between the two teacher characteristics of advanced degree completion and years of experience. These are two of the more quantifiable and highly regarded teacher characteristics in the profession. The typical teacher salary is a major component of education that places high value on these two characteristics. There are many other policies and legislation, such as the No Child Left Behind Act, teacher tenure, hiring practices, and staff reduction …

Decision Making And Creativity: A Qualitative Study Of Macarthur Fellows, Leslie Hennessy Ph.D.

Dissertations

This research study explored how eight individuals recognized for their creativity activate, develop, express, and sustain their creativity through decision making. The individuals were MacArthur Fellowship award winners. This prestigious fellowship is given to individuals who the MacArthur Foundation considers to be high-achieving and highly innovative individuals. The Fellowship recipients in this study were affiliated with either nonprofit or for-profit organizations, and all were founders of their respective organizations.

The specific goals of the research were to: (a) understand the details of participant decision making strategies and processes; (b) investigate if participants demonstrate consistent or different decision making strategies across …

Professional Quality Of Life And Emergency Department Nurses' Communication Patterns, Elvira Dominguez-Gomez Phd

Dissertations

The purpose of this mixed methods embedded design study was to examine relationships between compassion satisfaction, burnout, compassion fatigue/secondary trauma, and perceived levels of communication difficulty in emergency room nurses employed at a health care system. Quantitative data was collected from a purposive sample of 43 emergency room nurses using the Professional Quality of Life Scale (ProQOL), the Silencing Response Scale, and a demographic form. The study's embedded qualitative component was participants' experiences with traumatic cases in the emergency room. Qualitative data was collected via telephone interview with 10 emergency room nurses obtained from a subset of the original sample …

The Effects Of Leadership And High-Stakes Testing On The Retention Of Teachers, Amy Krohn Thibodeaux

Dissertations

The purpose of this study was to examine whether principal leadership behaviors and the demands of high-stakes tests had an impact on teachers’ intent to remain in the teaching profession. Perceptions of teachers concerning the contributing factors that led to their intent to remain in the teaching profession were also examined. Factors included in this study were examined by the researcher in an effort to gain knowledge of what leads to teacher job satisfaction in the teaching profession.

The researcher used a quantitative survey instrument with a qualitative component. The survey instrument was created by the researcher and consisted of …

The Relationship Between Frequency And Functionality Of Professional Learning Communities To Student Achievement, Jack Linton Jr.

Dissertations

The ultimate goal of teacher professional development is to improve student achievement by improving teacher practices. To that end, the literature and research supports the development of professional learning communities as one of the most effective ways to accomplish that goal.

Therefore, the research questions addressed in this study were: (a) Are schools in Mississippi using professional learning communities? (b) To what degree does the principal rate his or her school is functioning as a professional learning community as measured by the School Professional Staff as Learning Community instrument (Hord, 1996)? (c) …

A Study Of Statistical Efficiency On The Effects Of Non-Compliant Reporting And Item List Size From The Indirect Questioning Techniques: Random Response And Non-Random Response Models, Caroline Bublitz Emsermann

Dissertations

Estimating prevalent rates of sensitive behaviors using self-report measures generally resulted in bias estimates when direct questioning approaches were used. Random Response (RR) and Non-random Response (NRR) models were developed to provide an additional layer of confidentiality that was meant to illicit more honest reporting. Despite these efforts, there was evidence that survey participants using these techniques do not always report honestly, and as a result, estimates from these techniques were biased. The current study examined the statistical efficiency, using the ratio of MSE between the RR models, the unrelated question technique (UQT) and forced choice technique (FCT) and the …

Exploring Students' Perceptions And Performance On Predict-Observe-Explain Tasks In High School Chemistry Laboratory, Praveen Vadapally

Dissertations

This study sought to understand the impact of gender and reasoning level on students’ perceptions and performances of Predict-Observe-Explain (POE) laboratory tasks in a high school chemistry laboratory. Several literature reviews have reported that students at all levels have not developed the specific knowledge and skills that were expected from their laboratory work. Studies conducted over the last several decades have found that boys tend to be more successful than girls in science and mathematics courses. However, some recent studies have suggested that girls may be reducing this gender gap. This gender difference is the focal point of this research …

Schools Are Very Different Here: Somali Refugees' Perspectives Of Parent Involvement, Mary L. Van Korlaar

Dissertations

Qualitative case study with participant observation was used to explore the parent involvement experiences of nine Somali refugee parents in a small city in an agricultural area of the Rocky Mountain region. The parents of students who were attending classes through a school-based Welcome Center program were invited to participate. Parents were asked to discuss their own educational background, and their experiences prior to immigration to the United States in an effort to understand the development of their understanding, values and beliefs about education. Parents were also asked about their experiences in the local school systems to better understand their …