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Title: EVELYN OFFSCREEN: AN APPLICATION OF INTERACTIVE PERFORMANCE METHODSIN ALTERNATE REALITY GAMING.
Creator: Borglund, Dawn, Wirth, Jeff, University of Central Florida
Abstract / Description: For my thesis project for the Masters of Fine Art in Film and Digital Media, I designed and produced Evelyn Offscreen, an alternate reality game (ARG) that was facilitated by interactive performance. The goal was to create an interactive experience that allowed several players to collaboratively create story across numerous media within the field of alternate reality gaming. The approach used in Evelyn Offscreen was intended to provide a degree of creative freedom to the players that has not...
Show moreFor my thesis project for the Masters of Fine Art in Film and Digital Media, I designed and produced Evelyn Offscreen, an alternate reality game (ARG) that was facilitated by interactive performance. The goal was to create an interactive experience that allowed several players to collaboratively create story across numerous media within the field of alternate reality gaming. The approach used in Evelyn Offscreen was intended to provide a degree of creative freedom to the players that has not been demonstrated in other ARG experiences and to use digital media to capture information about the relative effectiveness of the different techniques that were employed. During the month of October 2009, Evelyn Offscreen invited players to participate in an overarching story as characters. The game existed simultaneously through several media platforms such as Ning, twitter, and blogger as well as scenes located in Central Florida where players could embody their character in a real world setting. The results revealed insights into techniques for massive collaboration of story and player reactions to this hybrid form of alternate reality gaming and interactive performance.
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Date Issued: 2010
Identifier: CFE0003059, ucf:48321
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003059

Title: TEACHING CHARACTERISTICS AND PRACTICES WHICH AFFECT LANGUAGE AND LITERACY DEVELOPMENT FOR STUDENTS WITH COMPLEX COMMUNICATION NEEDS.
Creator: King, Laura, Cross, Lee, University of Central Florida
Abstract / Description: This study examined teacher characteristics and practices identified as effective through current research for teaching students with complex communication needs. For this population, communication issues are more complex than those typically encountered in other settings. Specifically, the researcher asked: what are the desired characteristics and practices for this population, and are the desired characteristics and practices present in current settings? Working with six teachers in a large...
Show moreThis study examined teacher characteristics and practices identified as effective through current research for teaching students with complex communication needs. For this population, communication issues are more complex than those typically encountered in other settings. Specifically, the researcher asked: what are the desired characteristics and practices for this population, and are the desired characteristics and practices present in current settings? Working with six teachers in a large urban school district, this study utilized a multiple case study design. Criteria for participation included the teacher as the primary reading/language arts instructor for a student who used an augmentative and alternative communication system (AAC). This study builds on prior research and fills a gap in current research through a focus on the teacher. This study was conducted through three phases: a survey of teacher characteristics, observations of teacher practices, and a semi-structured interview. Four instruments were utilized to ensure validity. Results suggest that teachers for this population require knowledge on language and literacy specific to the non-verbal child. AAC training is critical in regard to programming and navigation. The use of other technology supports which offer auditory, visual, and access options are essential. Strong collaborative teams (school and district) are also important. However, one of the most significant findings documents that success may lie with the teacher's 'choice' to embrace challenges with this population. This issue of 'choice' questions the teacher's willingness (personally or professionally) to accept this commitment. This finding also questions the degree to which teachers are willing to pursue opportunities. Recommendations include the need for: training (teachers and paraprofessionals), pursuit of opportunities for supports, addressing parent issues, a district-based liaison between home and school, and to examine issues which prevent the recommended instructional time (90 minutes of reading instruction plus 45 minutes of supplemental instruction). Conclusions indicated that participants ranged from effective to ineffective. The identification of 'highly qualified' teachers through level of education and amount of experience did not correlate with participants' level of effectiveness. Given the limited research available, this study addresses a need in the field and lays the foundation for future research with this population.
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Date Issued: 2006
Identifier: CFE0001257, ucf:46921
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001257

Title: A CASE STUDY OF THE EFFECTS OF INQUIRY BASED PROFESSIONAL DEVELOPMENT THROUGH THE USE OF A MENTOR ON AN ALTERNATIVELY CERTIFIED ELEMENTARY TEACHER'S SCIENCE TEACHING SELF-EFFICACY.
Creator: Thrift, Michelle, Jeanpierre, Bobby, University of Central Florida
Abstract / Description: One alternatively certified elementary teacher was the subject of this sixteen week research study on science teaching self-efficacy. The researcher taught inquiry based student level science lessons to the fourth grade teacher. The teacher participant, in turn, taught those same lessons to her class while the researcher observed and took field notes. The participant responded to specific open ended questions in a journal after each science experience and also completed three interviews with...
Show moreOne alternatively certified elementary teacher was the subject of this sixteen week research study on science teaching self-efficacy. The researcher taught inquiry based student level science lessons to the fourth grade teacher. The teacher participant, in turn, taught those same lessons to her class while the researcher observed and took field notes. The participant responded to specific open ended questions in a journal after each science experience and also completed three interviews with the researcher. Each sequential lesson from the researcher was then modified based on participant needs. The participant completed the STEBI (Science Teaching Efficacy Belief Instrument) as a pre and post test to measure the effects of the above mentioned activities. The collected data from the STEBI was reported quantitatively. The collected data from the reflective journal entries and interviews were reported qualitatively. After careful analysis of the data gathered for this case study, the researcher came to the conclusion that inquiry based professional development through the use of a mentor affected the alternatively certified elementary teacher's science teaching self-efficacy. The subject maintained a positive attitude about the use of a mentor for the duration of the study and her Personal Science Teaching Efficacy increased or stayed the same on all of the STEBI questions. Limitations of the study as well as recommendations for further research were also discussed.
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Date Issued: 2007
Identifier: CFE0001618, ucf:47189
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001618

Title: EVALUATION OF ALTERNATIVE WATER RESOURCES FOR CAPE COAST AND ITS ENVIRONS IN GHANA.
Creator: Kumah, Alex, Nnadi, Ola, University of Central Florida
Abstract / Description: Cape Coast once a national capital of Ghana and its environs in recent years have constantly suffered perennial acute water shortage. The Brimsu dam which takes its supplies from the Kakum River with current production capacity of 1.4 × 104 m3/day cannot meet the water needs of the study area. The operating levels of the dam during crisis have reduced from 7.3 meters to 4.7 meters over the years with subsequent reduction in water production by 35%. Recently, the operating level has...
Show moreCape Coast once a national capital of Ghana and its environs in recent years have constantly suffered perennial acute water shortage. The Brimsu dam which takes its supplies from the Kakum River with current production capacity of 1.4 × 104 m3/day cannot meet the water needs of the study area. The operating levels of the dam during crisis have reduced from 7.3 meters to 4.7 meters over the years with subsequent reduction in water production by 35%. Recently, the operating level has reduced further to about 3.5 meters with 60% reduction in water supply. This study evaluated alternative water resources to augment water supply and mitigate the impact of perennial water shortage. Among the alternatives considered are surface water from Twifo Prasso on the Pra River, groundwater supplies, and the desalination technology. Mean annual streamflow of Pra River at Twifo Prasso was used to evaluate the continuous availability and reliance on surface water. Hydrogeological assessment of geology underlying the study area vis-à-vis the existing borehole and their yields was used to evaluate groundwater potential. Desalination technology which is not currently in existence in the study area was considered based on available literature. Since the implementation of projects of this magnitude are the responsibilities of the central government through grants and loans, the study focuses on the cost implications of water from these alternatives to the final consumer in terms of affordability. In considering the cost of water from the various alternatives to per capita per day consumption in rural and urban settlements within the study area for a household of five, the cost of surface water remains the most affordable means of water supply, followed by groundwater. Borehole yields indicate that intensive exploitation of groundwater even though more expensive than surface water sources could minimize the effect of perennial water shortage and over dependence on surface water. The cost comparison analyses have shown that the cost of desalination using reverse osmosis is still expensive and could not compare favorably with the existing water supply alternatives. The analyses have thus confirmed the long held perception that "desalination is expensive and cannot be used in study area".
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Date Issued: 2006
Identifier: CFE0001300, ucf:47018
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001300

Title: THE INFLUENCE OF SEXUAL SELECTION ON BEHAVIORAL AND PHYSIOLOGICAL MECHANISMS UNDERLYING REPRODUCTIVE SUCCESS IN MALE CAPE GROUND SQUIRRELS (XERUS INAURIS).
Creator: Manjerovic, Mary, Waterman, Jane, University of Central Florida
Abstract / Description: Sexual selection is considered a powerful evolutionary force responsible for the enormous diversity found in reproductive morphology, physiology, and behavior. I addressed questions related to selection in the Cape ground squirrel (Xerus inauris), a species characterized as highly social and promiscuous. These attributes often are responsible for variance in male reproductive success and as such, sexual selection theory predicts increased opportunity for sexual selection. I confirm that the...
Show moreSexual selection is considered a powerful evolutionary force responsible for the enormous diversity found in reproductive morphology, physiology, and behavior. I addressed questions related to selection in the Cape ground squirrel (Xerus inauris), a species characterized as highly social and promiscuous. These attributes often are responsible for variance in male reproductive success and as such, sexual selection theory predicts increased opportunity for sexual selection. I confirm that the predominant mechanism underlying genital evolution and competition for paternity in X. inauris is sperm competition. I find evidence that investment in sperm competition is costly and may reflect immunocompetence. I quantify reproductive success as it relates to alternative male tactics and female resource distribution. I find that male X. inauris alternative reproductive tactics differ within and across populations most likely due to differences in female resource distribution. In areas where females are evenly distributed, dispersed males encounter more estrous females, and therefore have increased breeding opportunities. However, the decision to remain natal does not preclude reproduction. I determine that these tactics are most likely conditional with equal fitness payoffs. Males, regardless of tactic, invest more in post-copulatory competition (e.g. sperm competition, copulatory plugs) than males within a population with a clustered distribution of breeding females. In the latter area, males form dominance hierarchies that affect copulatory success and lead to greater skews in reproduction among males. Both sites have evidence of a highly skewed variance in reproduction and intense sexual selective pressure. My results suggest these populations have increased opportunities for selection but that different mechanisms of intrasexual competition may result in rapid evolutionary change within this species.
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Date Issued: 2010
Identifier: CFE0003400, ucf:48402
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003400

Title: Analysis of Dialog Surrounding Animal Testing in Vaccine Research.
Creator: Johnson, Natalie, Scott, Blake, Rounsaville, Angela, Wheeler, Stephanie, University of Central Florida
Abstract / Description: This study analyzed the scholarly discussions surrounding the topic of animal testing for vaccine potency and safety in humans. The primary stakeholders in this discussion are the scientists, medical professionals, and researchers who are involved in animal models and alternative testing methods, specifically related to vaccine development. The debate among these professionals regarding alternative methods, which encompasses any testing approach that does not involve animals, has been...
Show moreThis study analyzed the scholarly discussions surrounding the topic of animal testing for vaccine potency and safety in humans. The primary stakeholders in this discussion are the scientists, medical professionals, and researchers who are involved in animal models and alternative testing methods, specifically related to vaccine development. The debate among these professionals regarding alternative methods, which encompasses any testing approach that does not involve animals, has been analyzed. This project looks at the argument from a historical perspective, which provides background context for the current debate and an understanding of how the current arguments originated. The changing mindset over time of using animals has been explored, as well as conversations and arguments about alternative methods.Research questions and prior questions consider the conversation's historical influences on this present day debate and are answered in this analysis. Persuasive language has been looked at, with a consideration of how it is used both within and outside the research community, as well as the influences the various stakeholders have on one another. The burgeoning field of the rhetoric of health and medicine provides a forum and a community of scholars for a rhetorical analysis such as this one to be discussed and the findings considered for other rhetorical studies. This research design project provides a comprehensive rhetorical analysis that uses the topoi theory and a textual-intertextual analysis as a framework, along with detailed coding of the texts. This project shows the advantages of a combined rhetorical approach that leads to understanding a debate through identifying multiple layers of argument. The findings and its implications for those within rhetoric, the scholarly community, as well as the scientific field are discussed in the final chapter.
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Date Issued: 2017
Identifier: CFE0006609, ucf:51288
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006609

Title: The Influence of Instruction in Base 8 on Prospective Teachers' Mathematical Knowledge for Teaching.
Creator: Harshman, Katie, Haciomeroglu, Erhan, Andreasen, Janet, Witta, Eleanor, Safi, Farshid, Lewis, Nancy, University of Central Florida
Abstract / Description: The focus of this research project was to extend existing research literature by providing insight to how prospective teachers with differing levels of mathematical knowledge developed their conceptual understanding of whole number concepts and operations. Prospective teachers of interest were enrolled in an Elementary School Mathematics Course for Teachers (in the College of Education) with a whole number concepts and operations unit set entirely in base 8. In this mixed-mode study,...
Show moreThe focus of this research project was to extend existing research literature by providing insight to how prospective teachers with differing levels of mathematical knowledge developed their conceptual understanding of whole number concepts and operations. Prospective teachers of interest were enrolled in an Elementary School Mathematics Course for Teachers (in the College of Education) with a whole number concepts and operations unit set entirely in base 8. In this mixed-mode study, participants were given the MKT, a measure designed to measure teacher mathematical knowledge for teaching, before and after taking the base 8 unit. The researcher focused on two specific constructs: Common Content Knowledge (CCK) and Specialized Content Knowledge (SCK). The qualitative portion of the study involved carefully constructed student interviews which allowed the researcher to deeply explore how prospective teacher conceptual understanding changed as a result of taking the unit in base 8. Four participants with varying levels of knowledge were selected to be interviewed based upon initial scores on the MKT: 1) low CCK and low SCK, 2) low CCK and high SCK, 3) high CCK and low SCK, 4) high CCK and high SCK. Results of the interviews were used to help explain results from the MKT. Quantitative and qualitative results showed that participants did not significantly increase their CCK, but did experience an increase in their conceptual understanding (SCK) as a result of taking the unit in base 8. Most prospective teachers entering the Elementary School Mathematics Course already had high procedural knowledge of the algorithms associated with elementary mathematics, which could account for the non-significant increase in CCK. Prospective teachers all showed deeper conceptual understanding of whole number concepts and operations at varying levels by the end of the base 8 unit. Prospective teachers showed their increased understanding by way of explanations, justifications, and alternate solution strategies.
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Date Issued: 2016
Identifier: CFE0006321, ucf:51552
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006321

Title: Effects of a Mixed-Mode Instructional Program on the Communicative Turns of Preschoolers with Down syndrome who use Augmentative and Alternative Communication.
Creator: Nicsinger, Erika, Kent-Walsh, Jennifer, Schwartz, Jamie, Hahs-Vaughn, Debbie, Binger, Cathy, University of Central Florida
Abstract / Description: Children with Down syndrome are at increased risk for a variety of deficits, including those in the area of speech, language, and literacy. Speech-language pathologists (SLPs) have historically focused on building children's verbal and signed vocabulary, but these efforts do not always result in significant changes in children's functional communication. Augmentative and alternative communication (AAC) systems and interventions have been recommended by the American Speech-Language-Hearing...
Show moreChildren with Down syndrome are at increased risk for a variety of deficits, including those in the area of speech, language, and literacy. Speech-language pathologists (SLPs) have historically focused on building children's verbal and signed vocabulary, but these efforts do not always result in significant changes in children's functional communication. Augmentative and alternative communication (AAC) systems and interventions have been recommended by the American Speech-Language-Hearing Association as appropriate options for facilitating functional communication skills with children with Down syndrome ([American Speech-Language-Hearing Association [ASHA], 2010; New York State Department of Health [NYSDOH], 2006). In spite of these recommendations, there exists a critical shortage of SLPs who are clinically competent in providing necessary AAC services to children with Down syndrome (Edgar (&) Rosa-Lugo, 2007; Light, McNaughton, Drager, Roberts, (&) Wilson, 2004). As a result, families of children with varying disabilities, including Down syndrome report high levels of stress related to accessing important professional expertise and intervention for their children (Dabrowska (&) Pisula, 2010). Researchers and clinicians alike must consider alternative treatment delivery options that are responsive to the needs of families and children with complex communication needs (Cirrin et al., 2010; Light (&) McNaughton, 2015). A telepractice service delivery model has been documented to ease burdens felt by families when attempting to access rehabilitative services (Gladden, 2013). Telepractice involves the use of technology to connect clinicians and clients at a distance for the purposes of assessment, intervention, or consultation (Theodoros, 2011). An expanding body of research promotes the use of telepractice service delivery within AAC to address the needs of both children and families. One evidence-based AAC intervention of interest is communication partner instruction. Communication partner instruction, even in small doses, has been proven to be an effective method for providing parents and children with complex communication needs, specifically children with Down syndrome, access to necessary intervention (Kent-Walsh, Murza, Malani, (&) Binger, 2015). Partner instruction involves educating those critical stakeholders who surround the child most frequently (e.g., parents, educators, educational assistants) to recognize and respond to children's communicative signals and to create opportunities for children to participate in the conversation (Pennington, Goldbart, (&) Marshall, 2004). Despite the evidence supporting the use of communication partner instruction, SLPs continue to struggle with implementation in billable contexts (Ogletree, 2013). SLPs in the United States often operate in a billable context, where the client must be actively involved in the therapy session in order for practitioners to receive reimbursement from insurance companies for time spent with clients. This issue has served as a barrier to use of communication partner instruction, as currently accepted research-validated models use introductory parent sessions independent of the children's learning to teach partner skills. Therefore, the current investigation examined the effects of a communication partner instruction using a mixed-mode service delivery model, which incorporated face-to-face and telepractice sessions, as well as a billable context. The focus of the protocol was on educating parents in one aided language strategy using a communication partner instruction program incorporating continuous child involvement and a mixed-mode service-delivery model, including both face-to-face and telepractice intervention components (e.g., Skype/FaceTime), to address the need for interventions which consider stressors faced by families when attempting to access evidence-based AAC intervention. The study utilized a single-case, multiple-probe experimental design across three parent-child dyads. Baseline, intervention, generalization, and maintenance phases were used to investigate the efficacy of the nine-session intervention. Visual analysis and Improvement Rate Difference (IRD) analyses indicated that the intervention was highly effective in increasing parents' use of the target strategy and children's communicative turntaking during shared storybook reading. One-hundred percent of parent participants increased their performance from baseline to post-intervention (IRD = 1.0), and all parents maintained these levels of achievement during the maintenance phase (IRD = 1.0). Similarly, children increased their frequency of communicative turns from baseline to post-intervention (IRD = 1.0), and all children participants maintained these levels of turntaking during the maintenance phase (IRD = 1.0), as well as during a novel book series (IRD = 1.0). These findings suggest that the mixed-mode service delivery model, which includes both face-to-face and telepractice sessions, as well as continuous child involvement is an effective method for increasing parents' use of a target strategy and children's frequency of multimodal communicative turns. Clinical and professional implications, as well as future directions for research are discussed.
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Date Issued: 2016
Identifier: CFE0006542, ucf:51327
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006542

Title: Dynamic Modeling of Autorotation for Simultaneous Lift and Wind Energy Extraction.
Creator: Mackertich, Sadaf, Das, Tuhin, Moslehy, Faissal, Xu, Yunjun, University of Central Florida
Abstract / Description: The goal of this thesis is to develop a multi-body dynamics model of autorotation with the objective of studying its application in energy harvesting. A rotor undergoing autorotation is termed an Autogyro. In the autorotation mode, the rotor is unpowered and its interaction with the wind causes an upward thrust force. The theory of an autorotating rotorcraft was originally studied for achieving safe flight at low speeds and later used for safe descent of helicopters under engine failure. The...
Show moreThe goal of this thesis is to develop a multi-body dynamics model of autorotation with the objective of studying its application in energy harvesting. A rotor undergoing autorotation is termed an Autogyro. In the autorotation mode, the rotor is unpowered and its interaction with the wind causes an upward thrust force. The theory of an autorotating rotorcraft was originally studied for achieving safe flight at low speeds and later used for safe descent of helicopters under engine failure. The concept can potentially be used as a means to collect high-altitude wind energy. Autorotation is inherently a dynamic process and requires detailed models for characterization. Existing models of autorotation assume steady operating conditions with constant angular velocity of the rotor. The models provide spatially averaged aerodynamic forces and torques. While these steady-autorotation models are used to create a basis for the dynamic model developed in this thesis, the latter uses a Lagrangian formulation to determine the equations of motion. The aerodynamic effects on the blades that produce thrust forces, in-plane torques, and out-of-plane torques, are modeled as non-conservative forces within the Lagrangian framework. To incorporate the instantaneous aerodynamic forces, the above-mentioned spatial averaging is removed. The resulting model is causal and consists of a system of differential equations. To investigate the dynamics under energy-harvesting operation, an additional in-plane regenerative torque is added to simulate the effect of a generator. The aerodynamic effects of this regenerative braking is incorporated into the model. In addition, the dynamic model relaxes assumptions of small flapping angles, and the periodic flapping behavior of the blades are naturally generated by the dynamics instead of assuming Fourier expansions. The dynamic model enables the study of transients due to change in operating conditions or external influences such as wind speeds. It also helps gain insight into force and torque fluctuations.Model verification is conducted to ensure that the dynamic model produces similar steady-operating conditions as those reported in prior works. In addition, the behavior of autorotation under energy harvesting is evaluated. The thesis also explores the viability of achieving sufficient lift while extracting energy from prevailing winds. A range of regenerative torques are applied to determine the optimal energy state. Finally, a complete high-altitude energy harvesting system is modeled by incorporating a tether utilizing a catenary model. Overall, the thesis lends support to the hypothesis that a tethered autogyro can support its weight while harvesting energy from strong wind-fields, when augmented with appropriate control systems.
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Date Issued: 2016
Identifier: CFE0006138, ucf:51173
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006138

Title: A Study of the Effectiveness of the Equals Mathematics Curriculum and Teacher Perceptions Of and Attitudes About the Curriculum.
Creator: Hughes, Jennifer, Murray, Kenneth, Kennedy, Mary, Doherty, Walter, Bai, Haiyan, University of Central Florida
Abstract / Description: The purpose of this study was to determine if the use of the Equals mathematics curriculum had any statistically significant impact on the 2012 Florida Alternate Assessment mathematics scores of students with disabilities in six Florida school districts when comparing the scores of those who received mathematics instruction via the curriculum to the scores of students with disabilities in six other Florida school districts who did not receive mathematics instruction via the curriculum. This...
Show moreThe purpose of this study was to determine if the use of the Equals mathematics curriculum had any statistically significant impact on the 2012 Florida Alternate Assessment mathematics scores of students with disabilities in six Florida school districts when comparing the scores of those who received mathematics instruction via the curriculum to the scores of students with disabilities in six other Florida school districts who did not receive mathematics instruction via the curriculum. This study further examined the perceptions of and attitudes about the Equals mathematics curriculum that exist among Exceptional Student Education (ESE) teachers who teach mathematics to students with disabilities participating in the Florida Alternate Assessment (FAA).The study utilized a mixed methods approach to research that included both quantitative and qualitative methodologies. The quantitative portion of the study was conducted using archival data obtained from the 2012 Florida Alternate Assessment Data Book. A Mann-Whitney U Test was conducted through SPSS at a significance level of ? = .05 to test for relative differences in performance between the treatment (Equals) and control (non-Equals) groups. Based on the results, the Equals mathematics curriculum did not have any statistically significant impact on the 2012 FAA mathematics scores for students with disabilities in the treatment school districts at any of the tested grade groupings (elementary, middle, high, and overall).The qualitative method of data collection utilized an online teacher survey. The results were analyzed using the researcher-coded results and assisted through summary tables provided by Survey-Monkey. Differences and similarities among the survey question responses were explored. Common terms and themes were noted and compared. Data triangulation was used by surveying teachers from five of the six treatment counties. This promoted generalizability for study replication since the treatment counties train teachers and utilize the curriculum in different manners. The results of the qualitative analysis indicated that many teachers were not satisfied with the training they received and felt overwhelmed by the curriculum itself, specifically in the areas of lesson planning and delivery. Based on the quantitative and qualitative results, it was concluded that further research needs to be completed to determine the effectiveness of the Equals mathematics curriculum when used with true fidelity.
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Date Issued: 2013
Identifier: CFE0004866, ucf:49651
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004866

Title: Numerical Simulations for the Flow of Rocket Exhaust Through a Granular Medium.
Creator: Kraakmo, Kristina, Moore, Brian, Brennan, Joseph, Rollins, David, University of Central Florida
Abstract / Description: Physical lab experiments have shown that the pressure caused by an impinging jet on a granular bed has the potential to form craters. This poses a danger to landing success and nearby spacecraft for future rocket missions. Current numerical simulations for this process do not accurately reproduce experimental results. Our goal is to produce improved simulations to more accurately and efficiently model the changes in pressure as gas flows through a porous medium. A two-dimensional model in...
Show morePhysical lab experiments have shown that the pressure caused by an impinging jet on a granular bed has the potential to form craters. This poses a danger to landing success and nearby spacecraft for future rocket missions. Current numerical simulations for this process do not accurately reproduce experimental results. Our goal is to produce improved simulations to more accurately and efficiently model the changes in pressure as gas flows through a porous medium. A two-dimensional model in space known as the nonlinear Porous Medium Equation as it is derived from Darcy's law is used. An Alternating-Direction Implicit (ADI) temporal scheme is presented and implemented which reduces our multidimensional problem into a series of one-dimensional problems. We take advantage of explicit approximations for the nonlinear terms using extrapolation formulas derived from Taylor-series, which increases efficiency when compared to other common methods. We couple our ADI temporal scheme with different spatial discretizations including a second-order Finite Difference (FD) method, a fourth-order Orthogonal Spline Collocation (OSC) method, and an Nth-order Chebyshev Spectral method. Accuracy and runtime are compared among the three methods for comparison in a linear analogue of our problem. We see the best results for accuracy when using an ADI-Spectral method in the linear case, but discuss possibilities for increased efficiency using an ADI-OSC scheme. Nonlinear results are presented using the ADI-Spectral method and the ADI-FD method.
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Date Issued: 2013
Identifier: CFE0005017, ucf:49998
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005017

Title: METHANE AND DIMETHYL ETHER OXIDATION AT ELEVATED TEMPERATURES AND PRESSURE.
Creator: Zinner, Christopher, Basu, Saptarshi, University of Central Florida
Abstract / Description: Autoignition and oxidation of two Methane (CH4) and Dimethyl Ether (CH3OCH3 or DME) mixtures in air were studied in shock tubes over a wide range of equivalence ratios at elevated temperatures and pressures. These experiments were conducted in the reflected shock region with pressures ranging from 0.8 to 35.7 atmospheres, temperatures ranging from 913 to 1650 K, and equivalence ratios of 2.0, 1.0, 0.5, and 0.3. Ignition delay times were obtained from shock-tube endwall pressure traces for...
Show moreAutoignition and oxidation of two Methane (CH4) and Dimethyl Ether (CH3OCH3 or DME) mixtures in air were studied in shock tubes over a wide range of equivalence ratios at elevated temperatures and pressures. These experiments were conducted in the reflected shock region with pressures ranging from 0.8 to 35.7 atmospheres, temperatures ranging from 913 to 1650 K, and equivalence ratios of 2.0, 1.0, 0.5, and 0.3. Ignition delay times were obtained from shock-tube endwall pressure traces for fuel mixtures of CH4/CH3OCH3 in ratios of 80/20 percent volume and 60/40 percent volume, respectively. Close examination of the data revealed that energy release from the mixture is occurring in the time between the arrival of the incident shock wave and the ignition event. An adjustment scheme for temperature and pressure was devised to account for this energy release and its effect on the ignition of the mixture. Two separate ignition delay correlations were developed for these pressure- and temperature-adjusted data. These correlations estimate ignition delay from known temperature, pressure, and species mole fractions of methane, dimethyl ether, and air (0.21 O2 + 0.79 N2). The first correlation was developed for ignition delay occurring at temperatures greater than or equal to 1175 K and pressures ranging from 0.8 to 35.3 atm. The second correlation was developed for ignition delay occurring at temperatures less than or equal to 1175 K and pressures ranging from 18.5 to 40.0 atm. Overall good agreement was found to exist between the two correlations and the data of these experiments. Findings of these experiments also include that with pressures at or below ten atm, increased concentrations of dimethyl ether will consistently produce faster ignition times. At pressures greater than ten atmospheres it is possible for fuel rich mixtures with lower concentrations of dimethyl ether to give the fastest ignition times. This work represents the most thorough shock tube investigation for oxidation of methane with high concentration levels of dimethyl ether at gas turbine engine relevant temperatures and pressures. The findings of this study should serve as a validation for detailed chemical kinetics mechanisms.
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Date Issued: 2008
Identifier: CFE0002096, ucf:47539
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002096

Title: Environmental Study of Solid Waste Collection.
Creator: Maimoun, Mousa, Reinhart, Debra, Mccauley Bush, Pamela, Cooper, Charles, University of Central Florida
Abstract / Description: The growing municipal solid waste generation rates have necessitated more efficient, optimized waste collection facilities. The majority of the US collection fleet is composed of diesel-fueled vehicles which contribute significant atmospheric emissions including greenhouse gases. In order to reduce emissions to the atmosphere, more collection agencies are investigating alternative fuel technologies such as natural gas, biofuels (bio-gas and bio-diesel), and hybrid electric technology. This...
Show moreThe growing municipal solid waste generation rates have necessitated more efficient, optimized waste collection facilities. The majority of the US collection fleet is composed of diesel-fueled vehicles which contribute significant atmospheric emissions including greenhouse gases. In order to reduce emissions to the atmosphere, more collection agencies are investigating alternative fuel technologies such as natural gas, biofuels (bio-gas and bio-diesel), and hybrid electric technology. This research is an in-depth environmental analysis of potential alternative fuel technologies for waste collection vehicles.This study will evaluate the use of alternative fuels by waste collection vehicles. Life-cycle emissions, cost, fuel and energy consumption were evaluated for a wide range of fossil and bio-fuel technologies. Moreover, the energy consumption and the tail-pipe emissions of diesel-fueled waste collection vehicles were estimated using MOVES 2010a software. Emission factors were calculated for a typical waste collection driving cycle as well as constant speed. Finally, the selection of fuel type by the waste collection industry requires consideration of environmental, security, financial, operational, and safety issues. In this study, a qualitative comparison between alternative fuels was performed; a multifactorial assessment of these factors was conducted taking into account the opinion of the waste collection industry of the importance of each factor.Liquid-petroleum fuels have higher life-cycle emissions compared to natural gas; however landfill natural gas has the lowest life-cycle emissions compared to all other fuel categories. Compressed natural gas waste collection vehicles have the lowest fuel cost per collection vehicle mile travel compared to other fuel categories. Moreover, the actual driving cycle of waste collection vehicles consists of repetitive stops and starts during waste collection; this generates more emissions than constant speed driving. Finally, the multifactorial assessment indicates that natural gas and landfill gas have better environmental, economical, and energy security performance than current liquid-petroleum fuels.
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Date Issued: 2011
Identifier: CFE0004133, ucf:49115
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004133

Title: Integrated Sustainability Assessment Framework for the U.S. Transportation.
Creator: Onat, Nuri, Tatari, Omer, Nam, Boo Hyun, Oloufa, Amr, Pazour, Jennifer, University of Central Florida
Abstract / Description: This dissertation aims to investigate the sustainability impacts of alternative vehicle technologies and develop comprehensive sustainability assessment frameworks to analyze potential impacts of these vehicles in the U.S. In order to assess sustainability impact of vehicle alternatives, life-cycle based models has been extensively used in the literature. Although life cycle-based models are often used for environmental impacts of alternative vehicles, analysis of social and economic impacts...
Show moreThis dissertation aims to investigate the sustainability impacts of alternative vehicle technologies and develop comprehensive sustainability assessment frameworks to analyze potential impacts of these vehicles in the U.S. In order to assess sustainability impact of vehicle alternatives, life-cycle based models has been extensively used in the literature. Although life cycle-based models are often used for environmental impacts of alternative vehicles, analysis of social and economic impacts of these vehicles has gained a tremendous interest. In this regard, there is a growing interest among the international platform and academia to use the Life Cycle Sustainability Assessment framework to have more informed sustainable products, material and technology choices by considering the environmental, as well as social and economic impacts. The Life Cycle Sustainability Assessment framework is still under development and there is an ongoing research to advance it for future applications. In this dissertation, current and future needs of sustainability assessment frameworks and the U.S. transportation are identified and addressed. The major research gaps are identified as follows: (1) there has been small emphasis on effects of spatial and temporal variations on the sustainability impacts of alternative vehicle technologies, (2) no national research efforts as of now have been directed specifically toward understanding the fundamental relationship between the adoption of electric vehicles and water demand, (3) there has been a lack of understanding the dynamic complexity of transportation sustainability, encompassing feedback mechanisms, and interdependencies, for the environmental, social, and economic impacts of alternative vehicles, and (4) there is no emphasis on addressing uncertainties inherent to the U.S. transportation and its complex relationships with the environment, society, and economy.The environmental, economic, and social impacts of alternative vehicles are highly critical for truly assessing and understanding the long-term sustainability of vehicles and propose economically viable, socially acceptable, and environmentally-friendly transportation solutions for U.S. passenger transportation. This dissertation provides a more comprehensive sustainability assessment framework by realizing following objectives: (1) inclusion of spatial and temporal variations when quantifying carbon, energy, and water footprints of alternative vehicle technologies, (2) quantifying environmental, social, and economic impacts of alternative vehicle technologies, (3) capturing the dynamic relations among the parameters of U.S. transportation system, environment, society, and the economy, (4) dealing with uncertainties inherent to the U.S. transportation sector considering the complexity of the system and dynamic relationships. The results of this dissertation reveal that the results with consideration of uncertainties, temporal and spatial variations, and dynamic complex relationships among the system variables can be significantly different than those of without consideration of those. Therefore, when developing policies the robustness of proposed scenarios should be valuated with consideration of uncertainties, temporal and spatial variations as well as the dynamic feedback mechanisms. The outcomes of this study can pave the way for advancement in the state-of-the-art and state-of-the-practice in the sustainability research by presenting novel approaches to deal with uncertainties and complex systems.
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Date Issued: 2015
Identifier: CFE0005857, ucf:50904
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005857

Title: Life-cycle Greenhouse Gas Emissions and Water Footprint of Residential Waste Collection and Management Systems.
Creator: Maimoun, Mousa, Reinhart, Debra, McCauley, Pamela, Cooper, David, University of Central Florida
Abstract / Description: Three troublesome issues concerning residential curbside collection (RCC) and municipal solid waste (MSW) management systems in the United States motivated this research. First, reliance upon inefficient collection and scheduling procedures negatively affect RCC efficiency, greenhouse gas (GHG) emissions, and cost. Second, the neglected impact of MSW management practices on water resources. Third, the implications of alternative fuels on the environmental and financial performance of waste...
Show moreThree troublesome issues concerning residential curbside collection (RCC) and municipal solid waste (MSW) management systems in the United States motivated this research. First, reliance upon inefficient collection and scheduling procedures negatively affect RCC efficiency, greenhouse gas (GHG) emissions, and cost. Second, the neglected impact of MSW management practices on water resources. Third, the implications of alternative fuels on the environmental and financial performance of waste collection where fuel plays a significant rule. The goal of this study was to select the best RCC program, MSW management practice, and collection fuel. For this study, field data were collected for RCC programs across the State of Florida. The garbage and recyclables generation rates were compared based on garbage collection frequency and use of dual-stream (DS) or single-stream (SS) recyclables collection system. The assessment of the collection programs was evaluated based on GHG emissions, while for the first time, the water footprint (WFP) was calculated for the most commonly used MSW management practices namely landfilling, combustion, and recycling. In comparing alternative collection fuels, two multi-criteria decision analysis (MCDA) tools, TOPSIS and SAW, were used to rank fuel alternatives for the waste collection industry with respect to a multi-level environmental and financial decision matrix. The results showed that SS collection systems exhibited more than a two-fold increase in recyclables generation rates, and a ~2.2-fold greater recycling efficiency compared to DS. The GHG emissions associated with the studied collection programs were estimated to be between 36 and 51 kg CO2eq per metric ton of total household waste (garbage and recyclables), depending on the garbage collection frequency, recyclables collection system (DS or SS) and recyclables compaction. When recyclables offsets were considered, the GHG emissions associated with programs using SS were estimated between -760 and -560, compared to between -270 and -210 kg CO2eq per metric ton of total waste for DS programs. In comparing the WFP of MSW management practices, the results showed that the WFP of waste landfilling can be reduced through implementing bioreactor landfilling. The WFP of electricity generated from waste combustion was less than the electricity from landfill gas. Overall, the WFP of electricity from MSW management practices was drastically less than some renewable energy sources. In comparing the WFP offsets of recyclables, the recycling of renewable commodities, e.g. paper, contributed to the highest WFP offsets compared to other commodities, mainly due to its raw material acquisition high WFPs. This suggests that recycling of renewable goods is the best management practice to reduce the WFP of MSW management. Finally, the MCDA of alternative fuel technologies revealed that diesel is still the best option, followed by hydraulic-hybrid waste collection vehicles (WCVs), then landfill gas (LFG) sourced natural gas, fossil natural gas and biodiesel. The elimination of the fueling station criterion from the financial criteria ranked LFG-sourced natural gas as the best option; suggesting that LFG sourced natural gas is the best alternative to fuel WCV when accessible. In conclusion, field data suggest that RCC system design can significantly impact recyclables generation rate and efficiency, and consequently determine environmental and economic impact of collection systems. The WFP concept was suggested as a method to systematically assess the impact of MSW management practices on water resources. A careful consideration of the WFP of MSW management practices and energy recovered from MSW management facilities is essential for the sustainable appropriation of water resources and development.
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Date Issued: 2015
Identifier: CFE0005656, ucf:50174
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005656

Title: Augmentative-Alternative Communication Access for Individuals with Communication Disorders in Medical Settings.
Creator: Amundsen, Stephanie, Kent-Walsh, Jennifer, Hoffman Ruddy, Bari, Rivers, Kenyatta, University of Central Florida
Abstract / Description: This study surveyed speech-language pathologists (SLPs) working in medical settings in the state of Florida in order to: (a) assess the availability of AAC devices, related materials, and services in acute, sub-acute, long-term care, and outpatient medical facilities, (b) examine barriers and supports in providing AAC services to patients with complex communication needs (CCN) in the aforementioned settings, and (c) determine perceived levels of AAC knowledge of health care practitioners. One...
Show moreThis study surveyed speech-language pathologists (SLPs) working in medical settings in the state of Florida in order to: (a) assess the availability of AAC devices, related materials, and services in acute, sub-acute, long-term care, and outpatient medical facilities, (b) examine barriers and supports in providing AAC services to patients with complex communication needs (CCN) in the aforementioned settings, and (c) determine perceived levels of AAC knowledge of health care practitioners. One of the study's major findings was that 97.59% of SLPs served at least one patient they identified as having CCNs, and 94.1% of respondents indicated that their patients could benefit from increased access to AAC devices and service delivery. A notable finding relating to the need for increased AAC-related communication partner instruction (CPI) is as follows: 97% and 100% of respondents indicated that increased CPI for medical practitioners/staff and family members, respectively, were important elements in order to ensure functional communication for individuals with AAC needs in the medical setting. Major barriers to providing AAC services related to device access (i.e., lack of AAC supports / devices, lack of funding for equipment, length of time of device funding). Other barriers were related to the nature of medical settings (i.e., frequently changing caseloads, limited time with patients) and demands of the job (i.e., lack of time to prepare AAC materials / devices). Supports to providing AAC services included low-tech AAC options and mobile technologies. In terms of practitioner knowledge, 57.6% of respondents rated themselves not at all or somewhat knowledgeable regarding AAC. Physicians, nurses, and other rehabilitation professionals were rated as less than knowledgeable by 95%, 97%, and 84.3% of participants, respectively. Overall, the findings of this study suggests there is a high prevalence of patients in medical settings with AAC needs, and some face unmet communication needs resulting from barriers related to the setting itself, lack of access to AAC devices and materials, and limited time spent on AAC service delivery.
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Date Issued: 2014
Identifier: CFE0005455, ucf:50370
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005455

Title: ZINC CADMIUM SULPHIDE AND ZINC SULPHIDE AS ALTERNATIVE HETEROJUNCTION PARTNERS FOR CIGS2 SOLAR CELLS.
Creator: Kumar, Bhaskar, Dhere, Neelkanth G, University of Central Florida
Abstract / Description: Devices with ZnCdS/ZnS heterojunction partner layer have shown better blue photon response due to higher band gap of these compounds as compared to devices with CdS heterojunction partner layer. CdS heterojunction partner layer has shown high photovoltaic conversion efficiencies with CIGS absorber layer while efficiencies are lower with CuIn1-xGaxS2 (CIGS2). A negative conduction band offset has been observed for CdS/CIGS2 as compared to near flat conduction band alignment in case of CdS/CIGS...
Show moreDevices with ZnCdS/ZnS heterojunction partner layer have shown better blue photon response due to higher band gap of these compounds as compared to devices with CdS heterojunction partner layer. CdS heterojunction partner layer has shown high photovoltaic conversion efficiencies with CIGS absorber layer while efficiencies are lower with CuIn1-xGaxS2 (CIGS2). A negative conduction band offset has been observed for CdS/CIGS2 as compared to near flat conduction band alignment in case of CdS/CIGS devices, which results in higher interface dominated recombination. Moreover, it has been predicted that optimum band offsets for higher efficiency solar cells may be achieved for cells with alternative heterojunction partner such as ZnS. With varying ratio of Zn/ (Zn+Cd) in ZnxCd1-xS a range of bandgap energies can be obtained and thus an optimum band offset can be engineered. For reducing interface dominated recombination better lattice match between absorber and heterojunction partners is desirable. Although CdS has better lattice match with CuIn1-xGaxS2 absorber layer, same is not true for CuIn1-xGaxS2 absorber layers. Utilizing ZnxCd1-xS as heterojunction partner provides a range of lattice constant (between aZnS= ~5.4 Ǻ and aCdS= ~5.7 Ǻ) depending on Zn/(Zn+Cd). Therefore better lattice match can be obtained between heterojunction partner and absorber layer. Better lattice match will lead to lower interface dominated recombination, hence higher open circuit voltages. In the present study chemical bath deposition parameters are near optimized for high efficiency CIGS2 Solar cells. Effect of various chemical bath deposition parameters on device performance was studied and attempts were made to optimize the deposition parameters in order to improve the device performance.In/(In+Ga) ratio in absorber layer is varied to obtain good lattice match and optimum band alignment. Solar cells with conversion efficiencies comparable to conventional CdS/CIGS2 has been obtained with ZnxCd1-xS /CIGS2. High short current as well as higher open circuit voltages were obtained with ZnxCd1-xS as alternative heterojunction partner for CIGS2 solar cells as compared to SLG/Mo/CIGS2/ CdS / i-ZnO/ZnO:Al.
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Date Issued: 2007
Identifier: CFE0001936, ucf:47469
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001936

Title: The Ontological Sociology of Cryptocurrency: A Theoretical Exploration of Bitcoin.
Creator: Villarreal, Omar, Gay, David, Hinojosa, Ramon, Corzine, Harold, University of Central Florida
Abstract / Description: For millennia, money has been a basal element of everyday life reality in market-organized societies. Albeit money has changed extrinsically (e.g., form, use, utility) countless of times, some intrinsic characteristics remain the same, i.e., money is reified value. But why? What gives money value? Even more crucial, what is money in the first place? This exploratory study delves into the intricacies of money, in particular the revolutionary 21st century pecuniary techno-phenomenon, a...
Show moreFor millennia, money has been a basal element of everyday life reality in market-organized societies. Albeit money has changed extrinsically (e.g., form, use, utility) countless of times, some intrinsic characteristics remain the same, i.e., money is reified value. But why? What gives money value? Even more crucial, what is money in the first place? This exploratory study delves into the intricacies of money, in particular the revolutionary 21st century pecuniary techno-phenomenon, a cryptocurrency called Bitcoin. Though cryptocurrencies have been the topic of several financial and legal scholarly publications for a few years, we rather focus our analysis on Bitcoin's ontological characteristics under a schema of overlapping theoretical layers: Social Exchange Theory, Marxian Dialectics, and Social Construction of Reality. Our intention is to dissect Bitcoin sociologically and empirically examine its global exchange, consumption, and institutionalization. Consequently, we venture to ask, can Bitcoin redefine the meaning of money and how we relate to it? Reformulate the role of banking? Disrupt the universally accepted objective reality of currency value attached to sensorial experience? Transfer trust from ambivalent human relations to an incorruptible algorithm? Or even become (")the Internet of money(")?
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Date Issued: 2016
Identifier: CFE0006412, ucf:51468
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006412

Title: Weighted Low-Rank Approximation of Matrices:Some Analytical and Numerical Aspects.
Creator: Dutta, Aritra, Li, Xin, Sun, Qiyu, Mohapatra, Ram, Nashed, M, Shah, Mubarak, University of Central Florida
Abstract / Description: This dissertation addresses some analytical and numerical aspects of a problem of weighted low-rank approximation of matrices. We propose and solve two different versions of weighted low-rank approximation problems. We demonstrate, in addition, how these formulations can be efficiently used to solve some classic problems in computer vision. We also present the superior performance of our algorithms over the existing state-of-the-art unweighted and weighted low-rank approximation algorithms...
Show moreThis dissertation addresses some analytical and numerical aspects of a problem of weighted low-rank approximation of matrices. We propose and solve two different versions of weighted low-rank approximation problems. We demonstrate, in addition, how these formulations can be efficiently used to solve some classic problems in computer vision. We also present the superior performance of our algorithms over the existing state-of-the-art unweighted and weighted low-rank approximation algorithms.Classical principal component analysis (PCA) is constrained to have equal weighting on the elements of the matrix, which might lead to a degraded design in some problems. To address this fundamental flaw in PCA, Golub, Hoffman, and Stewart proposed and solved a problem of constrained low-rank approximation of matrices: For a given matrix $A = (A_1\;A_2)$, find a low rank matrix $X = (A_1\;X_2)$ such that ${\rm rank}(X)$ is less than $r$, a prescribed bound, and $\|A-X\|$ is small.~Motivated by the above formulation, we propose a weighted low-rank approximation problem that generalizes the constrained low-rank approximation problem of Golub, Hoffman and Stewart.~We study a general framework obtained by pointwise multiplication with the weight matrix and consider the following problem:~For a given matrix $A\in\mathbb{R}^{m\times n}$ solve:\begin{eqnarray*}\label{weighted problem}\min_{\substack{X}}\|\left(A-X\right)\odot W\|_F^2~{\rm subject~to~}{\rm rank}(X)\le r,\end{eqnarray*}where $\odot$ denotes the pointwise multiplication and $\|\cdot\|_F$ is the Frobenius norm of matrices.In the first part, we study a special version of the above general weighted low-rank approximation problem.~Instead of using pointwise multiplication with the weight matrix, we use the regular matrix multiplication and replace the rank constraint by its convex surrogate, the nuclear norm, and consider the following problem:\begin{eqnarray*}\label{weighted problem 1}\hat{X} (&)=(&) \arg \min_X \{\frac{1}{2}\|(A-X)W\|_F^2 +\tau\|X\|_\ast\},\end{eqnarray*}where $\|\cdot\|_*$ denotes the nuclear norm of $X$.~Considering its resemblance with the classic singular value thresholding problem we call it the weighted singular value thresholding~(WSVT)~problem.~As expected,~the WSVT problem has no closed form analytical solution in general,~and a numerical procedure is needed to solve it.~We introduce auxiliary variables and apply simple and fast alternating direction method to solve WSVT numerically.~Moreover, we present a convergence analysis of the algorithm and propose a mechanism for estimating the weight from the data.~We demonstrate the performance of WSVT on two computer vision applications:~background estimation from video sequences~and facial shadow removal.~In both cases,~WSVT shows superior performance to all other models traditionally used. In the second part, we study the general framework of the proposed problem.~For the special case of weight, we study the limiting behavior of the solution to our problem,~both analytically and numerically.~In the limiting case of weights,~as $(W_1)_{ij}\to\infty, W_2=\mathbbm{1}$, a matrix of 1,~we show the solutions to our weighted problem converge, and the limit is the solution to the constrained low-rank approximation problem of Golub et. al. Additionally, by asymptotic analysis of the solution to our problem,~we propose a rate of convergence.~By doing this, we make explicit connections between a vast genre of weighted and unweighted low-rank approximation problems.~In addition to these, we devise a novel and efficient numerical algorithm based on the alternating direction method for the special case of weight and present a detailed convergence analysis.~Our approach improves substantially over the existing weighted low-rank approximation algorithms proposed in the literature.~Finally, we explore the use of our algorithm to real-world problems in a variety of domains, such as computer vision and machine learning. Finally, for a special family of weights, we demonstrate an interesting property of the solution to the general weighted low-rank approximation problem. Additionally, we devise two accelerated algorithms by using this property and present their effectiveness compared to the algorithm proposed in Chapter 4.
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Date Issued: 2016
Identifier: CFE0006833, ucf:51789
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006833

Title: PERSPECTIVES ON THE EUROZONE CRISIS: ASSESSING THE EFFECTS ON THE POLITICAL SYSTEMS OF GERMANY, FRANCE, AND THE UNITED KINGDOM.
Creator: Myerson, Caitlyn, Sadri, Houman, University of Central Florida
Abstract / Description: In 2010, the reverberations of the 2008 Global Financial Crisis had created a whole new crisis in Europe. Five Eurozone countries, Greece, Spain, Portugal, Ireland, and Cyprus all had requested financial aid packages, unable to repay their national debt. The crisis is ongoing in Europe ever since, becoming the greatest challenge presented to the Eurozone since the monetary union was formed. The intent of this thesis is to explore the effects of the Eurozone crisis on the political systems of...
Show moreIn 2010, the reverberations of the 2008 Global Financial Crisis had created a whole new crisis in Europe. Five Eurozone countries, Greece, Spain, Portugal, Ireland, and Cyprus all had requested financial aid packages, unable to repay their national debt. The crisis is ongoing in Europe ever since, becoming the greatest challenge presented to the Eurozone since the monetary union was formed. The intent of this thesis is to explore the effects of the Eurozone crisis on the political systems of Germany, France, and the United Kingdom. This thesis will study the effects utilizing the most prominent perspectives in political economy: neoliberalism, neomercantilism, and structuralism. This thesis also attempts to explain the recent rise in Euroscepticism in each country, whilst seeking an explanation in the rise in three Eurosceptic parties: Alternative fur Deutschland from Germany, National Front from France, and the United Kingdom Independence Party. Lastly, this thesis conducts a comparative analysis to find the common elements in each case study, as well as the areas in which the studies diverge.
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Date Issued: 2015
Identifier: CFH0004867, ucf:45477
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004867

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