Digital Commons Network^™

An All-Against-One Game Approach For The Multi-Player Pursuit-Evasion Problem, Shahriar Talebi

Electronic Theses and Dissertations

The traditional pursuit-evasion game considers a situation where one pursuer tries to capture an evader, while the evader is trying to escape. A more general formulation of this problem is to consider multiple pursuers trying to capture one evader. This general multi-pursuer one-evader problem can also be used to model a system of systems in which one of the subsystems decides to dissent (evade) from the others while the others (the pursuer subsystems) try to pursue a strategy to prevent it from doing so. An important challenge in analyzing these types of problems is to develop strategies for the pursuers …

Effect Of Load Path And Failure Modes On Seismic Response Of Regular Bridges., Haider Darwash

Electronic Theses and Dissertations

Bridges are essential infrastructure constituents that have been studied for centuries. Typically, seismic bridge design and assessment utilize simplified modeling and analysis techniques based on one-dimensional spine elements and zero-length springs/hinges. The geometry of the elements and calibration of parameters are based on assumptions for the lateral load path and failure modes, e.g., sacrificial backwall and shear keys, neglecting wing walls, and strength based on backfill alone. These assumptions have led to observations of underestimated resistance, overestimated displacement demands, and unpredicted damage and failure mode. The focus of the study is on ordinary standard bridges with continuous reinforced concrete box …

Optimization Approaches For Electricity Generation Expansion Planning Under Uncertainty, Yiduo Zhan

Electronic Theses and Dissertations

In this dissertation, we study the long-term electricity infrastructure investment planning problems in the electrical power system. These long-term capacity expansion planning problems aim at making the most effective and efficient investment decisions on both thermal and wind power generation units. One of our research focuses are uncertainty modeling in these long-term decision-making problems in power systems, because power systems' infrastructures require a large amount of investments, and need to stay in operation for a long time and accommodate many different scenarios in the future. The uncertainties we are addressing in this dissertation mainly include demands, electricity prices, investment and …

Resource Allocation And Pricing In Secondary Dynamic Spectrum Access Networks, Enas Khairullah

Electronic Theses and Dissertations

The paradigm shift from static spectrum allocation to a dynamic one has opened many challenges that need to be addressed for the true vision of Dynamic Spectrum Access (DSA) to materialize. This dissertation proposes novel solutions that include: spectrum allocation, routing, and scheduling in DSA networks. First, we propose an auction-based spectrum allocation scheme in a multi-channel environment where secondary users (SUs) bid to buy channels from primary users (PUs) based on the signal to interference and noise ratio (SINR). The channels are allocated such that i) the SUs get their preferred channels, ii) channels are re-used, and iii) there …

Improving The Performance Of Data-Intensive Computing On Cloud Platforms, Wei Dai

Electronic Theses and Dissertations

Big Data such as Terabyte and Petabyte datasets are rapidly becoming the new norm for various organizations across a wide range of industries. The widespread data-intensive computing needs have inspired innovations in parallel and distributed computing, which has been the effective way to tackle massive computing workload for decades. One significant example is MapReduce, which is a programming model for expressing distributed computations on huge datasets, and an execution framework for data-intensive computing on commodity clusters as well. Since it was originally proposed by Google, MapReduce has become the most popular technology for data-intensive computing. While Google owns its proprietary …

Chaotification As A Means Of Broadband Vibration Energy Harvesting With Piezoelectric Materials, Daniel Geiyer

Electronic Theses and Dissertations

Computing advances and component miniaturization in circuits coupled with stagnating battery technology have fueled growth in the development of high efficiency energy harvesters. Vibration-to-electricity energy harvesting techniques have been investigated extensively for use in sensors embedded in structures or in hard-to-reach locations like turbomachinery, surgical implants, and GPS animal trackers. Piezoelectric materials are commonly used in harvesters as they possess the ability to convert strain energy directly into electrical energy and can work concurrently as actuators for damping applications. The prototypical harvesting system places two piezoelectric patches on both sides of the location of maximum strain on a cantilever beam. …

Effects Of Surfactant Concentrations On Perovskite Emitters Embedded In Polystyrene, Eric Calkins

Electronic Theses and Dissertations

With their simple fabrication, narrow light spectrum, and color tunability, a class of materials known as perovskites are emerging as promising candidates for light emission applications. These materials, when exposed to normal atmospheric conditions show significant degradation. Improved protection has been demonstrated by embedding perovskites in polymers. Furthermore, the addition of a surfactant into the precursor solution has been shown to increase stability and allow for color tuning by exploiting quantum confinement effects. However, the effects of surfactants typically used to stabilize perovskites in solution have not been explored in this polymer embedding strategy. Here we determine the physical and …

Flocks, Swarms, Crowds, And Societies: On The Scope And Limits Of Cognition, Zachariah A. Neemeh

Honors Undergraduate Theses

Traditionally, the concept of cognition has been tied to the brain or the nervous system. Recent work in various noncomputational cognitive sciences has enlarged the category of “cognitive phenomena” to include the organism and its environment, distributed cognition across networks of actors, and basic cellular functions. The meaning, scope, and limits of ‘cognition’ are no longer clear or well-defined. In order to properly delimit the purview of the cognitive sciences, there is a strong need for a clarification of the definition of cognition. This paper will consider the outer bounds of that definition. Not all cognitive behaviors of a given …

Gallai-Ramsey Numbers For C7 With Multiple Colors, Dylan Bruce

Honors Undergraduate Theses

The core idea of Ramsey theory is that complete disorder is impossible. Given a large structure, no matter how complex it is, we can always find a smaller substructure that has some sort of order. One view of this problem is in edge-colorings of complete graphs. For any graphs G, H₁, ..., H_k, we write G → (H₁, ..., H_k), or G → (H)_k when H₁ = ··· = H_k = H, if every k-edge-coloring of G contains a monochromatic H_i in color i for some i ∈ …

Spatial And Temporal Compressive Sensing For Vibration-Based Monitoring: Fundamental Studies With Beam Vibrations, Vaahini Ganesan

Electronic Theses and Dissertations

Vibration data from mechanical systems carry important information that is useful for characterization and diagnosis. Standard approaches rely on continually streaming data at a fixed sampling frequency. For applications involving continuous monitoring, such as Structural Health Monitoring (SHM), such approaches result in high data volume and require powering sensors for prolonged duration. Furthermore, adequate spatial resolution, typically involves instrumenting structures with a large array of sensors. This research shows that applying Compressive Sensing (CS) can significantly reduce both the volume of data and number of sensors in vibration monitoring applications. Random sampling and the inherent sparsity of vibration signals in …

The Role Of The Y-Chromosome In The Evolution Of Autosomally Coded Traits, Ian Kutch

Electronic Theses and Dissertations

Recent work indicates that the Y-chromosome of the fruit fly Drosophila melanogaster can influence gene regulation on the autosomes and X chromosome. This newly discovered function of the Y has the potential to dramatically shape the regulatory evolution of numerous genes that reside throughout the genome; even for genes that code for both male and female traits. Given that the mechanism underlying the Y-linked influence on gene expression in D. melanogaster appears to exist in other independently evolved heterogametic sex chromosomes, the evolutionary implications of Y-linked regulatory variation (YRV) deserves to be explored. These implications include the potential for Y-chromosomes …

Cd-Rom's Acquaintances: What To Do With The Skeletons In Our Academic Libraries, Jeanne Piascik, Kristine Shrauger, Lindsey Ritzert

Faculty Scholarship and Creative Works

The University of Central Florida (UCF) Libraries had a large number of CD-ROMs accompanying books that had not circulated, did not work, or both. This article outlines the evaluation process of withdrawal.

University Of Central Florida Factbook 2016-2017, University Of Central Florida

Historical Fact Book and Enrollment

Historical fact book and enrollment data for the University of Central Florida.

American Chemical Society (Acs) Legacy Archives, Ucf Libraries

Technology Fee Funded Projects

The UCF Libraries is requesting $98,835 ($101,835-$3,000 cost share) for the one-time purchase of the American Chemical Society (ACS) Legacy Archives.

Can We Improve Student Achievement Through Multiple Interventions? A Test Of Theory, Joshua Guillemette

Electronic Theses and Dissertations

The research conducted tested a theory based on work by Tinto (1999), Astin (1984), and the Center for Community College Student Engagement (CCCSE, 2012) that multiple interventions are needed to significantly improve graduation rates at community colleges. The literature says little about this approach for community college students; therefore, this dissertation contributes to the knowledge base for educational programs. A first-year program at a large, diverse community college using multiple interventions assisted in determining the validity of the theory. The interventions built into the first-year program included learning communities, a student success course (SSC), proactive advising, and experiential learning. The …

Computer Programming With Early Elementary Students With And Without Intellectual Disabilities, Matthew Taylor

Electronic Theses and Dissertations

Researchers suggest students at the preschool and kindergarten grade levels are active learners and creators and need to be exposed to science, technology, engineering, and mathematics (STEM) curriculum. The need for student understanding in STEM curriculum is well documented, and positive results in robotics, computer programming, and coding are leading researchers and policy makers to introduce new standards in education. The purpose of this single case design study is to research the abilities of kindergarten students, with and without intellectual disabilities (ID), to learn skills in computer programming and coding through explicit instruction, concrete manipulatives, and tangible interfaces. While constructionist …

The Effectiveness Of Project-Based Learning Using Digital Storytelling Technology On Improving Second-Grade Students' Performance Of Science Standards, Mariella Dorr

Electronic Theses and Dissertations

The purpose of this study was to find the effectiveness of digital storytelling technology integration through a project-based learning approach using digital stories combined with hands-on guided inquiry science lessons. As a teacher researcher, the focus was on the effectiveness in the performance of second-grade students using higher-order thinking science standards. For a period of ten weeks, the researcher through comparative action research investigated how emergent technology integration improved the performance of two second-grade classrooms implementing three higher-order thinking life science standards. A total of 27 students from two second-grade classrooms volunteered for this research. For the study, a pretest …

Scientific Transformations: A Philosophical And Historical Analysis Of Cosmology From Copernicus To Newton, Manuel-Albert Castillo

Electronic Theses and Dissertations

The purpose of this thesis is to show a transformation around the scientific revolution from the sixteenth to seventeenth centuries against a Whig approach in which it still lingers in the history of science. I find the transformations of modern science through the cosmological models of Nicholas Copernicus, Johannes Kepler, Galileo Galilei and Isaac Newton. Since of the enormous content, I shall only pay particular attention to Copernicus and Newton in which the emerging sciences transformed the cosmos on what Alexandre Koyré calls from a "closed world to infinite universe". As an interdisciplinary approach, I used the methods and inquiries …

Advanced Liquid Crystal Displays With Supreme Image Qualities, Haiwei Chen

Electronic Theses and Dissertations

Several metrics are commonly used to evaluate the performance of display devices. In this dissertation, we analyze three key parameters: fast response time, wide color gamut, and high contrast ratio, which affect the final perceived image quality. Firstly, we investigate how response time affects the motion blur, and then discover the 2-ms rule. With advanced low-viscosity materials, new operation modes, and backlight modulation technique, liquid crystal displays (LCDs) with an unnoticeable image blur can be realized. Its performance is comparable to an impulse-type display, like cathode ray tube (CRT). Next, we propose two novel backlight configurations to improve an LCD's …

Enhanced Ablation By Femtosecond And Nanoseond Pulses, Haley Kerrigan

Electronic Theses and Dissertations

Laser ablation of GaAs by a combination of femtosecond and nanosecond pulses is investigated as a means of enhancing material removal by a femtosecond pulse in the filamentation intensity regime. We demonstrate for the first time increased ablation of GaAs by ultrafast laser pulse plasmas augmented by nanosecond pulse radiation from a secondary laser. Material removal during laser ablation is a complex process that occurs via multiple mechanisms over several timescales. Due to different pulse durations, ablation by femtosecond and nanosecond pulses are dominated by different mechanisms. Ablation can be enhanced by optimally combining a femtosecond and nanosecond pulse in …

Laser-Induced Crystallization Mechanisms In Chalcogenide Glass Materials For Advanced Optical Functionality, Laura Sisken

Electronic Theses and Dissertations

Glass-ceramics (GC) are promising candidates for gradient refractive index (GRIN) optics. These multi-phase, composite materials also exhibit improved physical properties as compared to the parent base glass resulting from the formation of a secondary crystalline phase(s). Nanocrystal phase formation in a multi-component chalcogenide glass (ChG), (GeSe2-3As2Se3)(1-x)-(PbSe)x glass where x = 0-40 has been investigated, and the role of the starting material morphology has been correlated to the resulting composite's optical properties including refractive index, transmission, dispersion, and thermo-optic coefficient. Optical property evolution was related to the type and amount of the crystal phases formed, since through control of the local …

The Consequences Of A Reduced Superlattice Thickness On Quantum Cascade Laser Performance, Pedro Figueiredo

Electronic Theses and Dissertations

Coherent infrared radiation sources are essential for the operability of a wide range of scientific, industrial, military and commercial systems. The importance of the mid-infrared spectral region cannot be understated. Numerous molecules have some vibrational band in this range, allowing for identification of species by means of absorption, emission or some other form of spectroscopy. As such, spectroscopy alone has numerous applications ranging from industrial process control to disease diagnosis utilizing breath analysis. However, despite the discovery of the LASER in the 60s, to this day the amount of coherent sources in this range is limited. It is for this …

Plasma Dynamics Of Laser Filaments, Danielle Reyes

Electronic Theses and Dissertations

Laser filamentation is a complex phenomenon occurring for pulses with peak power above a critical value. A filament is a dynamic self-guided structure characterized by several unique qualities, which include a beam with a high-intensity core surrounded by an energy reservoir, a weakly ionized plasma channel, and supercontinuum generation. Several of the proposed applications for filamentation utilize the plasma channel, such as for assisted electric discharge and microwave guiding. However, filament properties are highly influenced by the physical conditions under which they are formed. A host of studies have been conducted to further characterize filaments, but much work still remains …

Reasoning About Frame Properties In Object-Oriented Programs, Yuyan Bao

Electronic Theses and Dissertations

Framing is important for specification and verification of object-oriented programs. This dissertation develops the local reasoning approach for framing in the presence of data structures with unrestricted sharing and subtyping. It can verify shared data structures specified in a concise way by unifying fine-grained region logic and separation logic. Then the fine-grained region logic is extended to reason about subtyping. First, fine-grained region logic is adapted from region logic to express regions at the granularity of individual fields. Conditional region expressions are introduced; not only does this allow one to specify more precise frame conditions, it also has the ability …

Ugh…Statistics! College Students’ Attitudes And Perceptions Toward Statistics, Drew A. Doyle

Honors Undergraduate Theses

Statistics is a course that is required for a majority of undergraduate college students in a wide variety of majors. It is not just required for Statistics or Mathematics majors, but also for those undergraduate college students majoring in Biology, Engineering, Sociology, and countless other majors. It can often be seen as a daunting course, especially for those who feel that mathematics is not their strongest subject. Students begin to dislike the course before even starting and this can carry on throughout the entirety of the course. This thesis will focus primarily on students’ perceptions and attitudes toward their statistics …

The Integration Of Music In An Ela Classroom: Creating Pedagogical Parodies For Elementary Education, Doranna Smith

Honors Undergraduate Theses

The intent of this thesis is to capitalize the effects of using music as a tool in tandem with English language arts in order for students to improve their ELA skills. Songs are already flooding the Internet and social media; such as Facebook, Instagram, Twitter, and Vine, echoing in the background of television broadcasts and commercials, and blasting across radio stations and in public areas like restaurants and malls, classroom lessons tied to current songs, are more apt to resonate with students in this era. In lieu of subconsciously humming a song by popular artist such as Beyoncé, Kanye West, …

A Structural And Functional Analysis Of Human Brain Mri With Attention Deficit Hyperactivity Disorder, Arjun A. Watane

Honors Undergraduate Theses

Attention Deficit Hyperactivity Disorder (ADHD) affects 5-10% of children worldwide. Its effects are mainly behavioral, manifesting in symptoms such as inattention, hyperactivity, and impulsivity. If not monitored and treated, ADHD may adversely affect a child's health, education, and social life. Furthermore, the neurological disorder is currently diagnosed through interviews and opinions of teachers, parents, and physicians. Because this is a subjective method of identifying ADHD, it is easily prone to error and misdiagnosis. Therefore, there is a clear need to develop an objective diagnostic method for ADHD.

The focus of this study is to explore the use of machine language …

Profit-Bearing Administrators: Exploring The Application Of Economics And Financial Concepts In Healthcare Management, Brandon K. Riddick

Honors Undergraduate Theses

Healthcare managers face an incredible challenge today; understanding and implementing financially and economically sound decisions in the complex healthcare environment of the United States. The pressure to be profitable managers is greater than ever. Considering current research, past studies, and articles focused on the demands of healthcare managers will illuminate the state of health care administration, and the importance of real world application of accounting and economics in healthcare.

This thesis will explore and examine research about industry standards, and the need for preparedness in healthcare finance management. It will also examine the important and complex role of accounting and …

Using Low-Coherence Interferometry To Monitor Cell Invasion In An In-Vitro Model System, Behnaz Davoudi Nasab

Honors Undergraduate Theses

In an optically random system, such as naturally occurring and man-made media, light undergoes pronounced multiple scattering. This phenomenon has shown a remarkable potential in characterizing complex materials. In this regime, scattering occurs from each individual center of the scattering and independent scattering events lead to multiple light scattering. This phenomenon is often described as a random walk of photons and can be modeled in terms of a diffusion equation based on the radiative transfer theory. In this thesis, we used optical path-length spectroscopy (OPS), which is an experimental method to obtain the path-length probability density of the propagating light …

Temperature Dependence Of Dynamical Spin Injection In A Superconducting Niobium Thin Film, Tyler S. Townsend

Honors Undergraduate Theses

Spintronics is a research field that focuses on the manipulation of the quantum mechanical spin of charge carriers in solid state materials for future technological applications. Creating large spin currents with large relaxation times is sought after in the field of spintronics which may be aided by combining spintronics with superconductivity. This thesis provides a phenomological study of the effective change in ferromagnetic resonance linewidth, by dynamical spin injection into a permalloy-copper-niobium tri-layer in the superconducting state. The ferromagetic resonance linewidth was measured from 2-14 K. It was observed that there was a change in the behavior of the resonance …