View All Items

Title: Ok, Ladies, Now Let's Get Information: Recognizing Moments of Rhetorical Identification in Beyonc(&)#233;'s Digital Activism.
Creator: Arban, Garrett, Jones, Natasha, Vie, Stephanie, Wheeler, Stephanie, University of Central Florida
Abstract / Description: This research seeks to understand how activists are encouraging audiences to identify with their work in digital spaces through a case study of Beyonc(&)#233; Knowles-Carter's activism. The current scholarship surrounding digital activism is extensive and has offered a detailed look at individual tools used in activist movements, but there is a lack of research that recognizes the complex network of tools that are often used by an activist or activist group. To address this gap in the...
Show moreThis research seeks to understand how activists are encouraging audiences to identify with their work in digital spaces through a case study of Beyonc(&)#233; Knowles-Carter's activism. The current scholarship surrounding digital activism is extensive and has offered a detailed look at individual tools used in activist movements, but there is a lack of research that recognizes the complex network of tools that are often used by an activist or activist group. To address this gap in the research, this thesis offers an analysis of three specific activist tools used by Beyonc(&)#233; to encourage her fans and other audiences to identify with and participate in her activism. This study investigates the methods Beyonc(&)#233; employs to get her multiple audiences informed and engaged through an analysis of her activist blog, the (")Formation(") music video, and her live performance during the 2016 Super Bowl halftime show. Specifically, the purpose of this study is to assess, from a rhetorical standpoint, how Beyonc(&)#233; is inviting her audiences to respond and become engaged.The analysis of these three activist tools utilizes qualitative data analysis, focusing on Burke's (1969) concept of rhetorical identification to understand how her activist messages are presented across mediums. To expand on the findings of this analysis, a reception study on Beyonc(&)#233;'s (")Formation(") music video and 2016 Super Bowl performance was conducted to gauge the success of her rhetorical methods. The findings of this study recognize the need to continue looking at the multiple tools used by activists to understand the complexity of their rhetorical work online. This study also provides methods for analyzing the intertextual nature of digital activism so that further research can be done. While this study begins to address the gap in the current scholarship, more research needs to be done to study the current rhetorical practices of digital activists.
Show less
Date Issued: 2017
Identifier: CFE0006557, ucf:51344
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006557

Title: Ozone and GAC Treatment of a Central Florida Groundwater for Sulfide and Disinfectant By-Product Control.
Creator: Lamoureux, Tara, Duranceau, Steven, Randall, Andrew, Wang, Dingbao, University of Central Florida
Abstract / Description: This study evaluated the combination of ozone and granular activated carbon (GAC) treatment for the removal of sulfide and disinfection byproduct (DBP) precursors in drinking water at the pilot-scale. The research conducted was performed at the Auxiliary (Aux) and Main Water Treatment Plants (WTPs) in Sanford, Florida. Both WTPs rely upon groundwater sources that contain total sulfide ranging from 0.02 to 2.35 mg/L and total organic carbon (TOC) ranging from 0.61 to 2.20 mg/L. The Aux WTP's...
Show moreThis study evaluated the combination of ozone and granular activated carbon (GAC) treatment for the removal of sulfide and disinfection byproduct (DBP) precursors in drinking water at the pilot-scale. The research conducted was performed at the Auxiliary (Aux) and Main Water Treatment Plants (WTPs) in Sanford, Florida. Both WTPs rely upon groundwater sources that contain total sulfide ranging from 0.02 to 2.35 mg/L and total organic carbon (TOC) ranging from 0.61 to 2.20 mg/L. The Aux WTP's raw water contains, on average, 88% more sulfide and 24% more TOC than the Main WTP. Haloacetic acids (HAA5) and total trihalomethanes (TTHMs) comprise the regulated forms of DBPs. HAA5 are consistently below the maximum contaminant level (MCL) of 60 ?g/L, while TTHM ranges from 70 to 110 ?g/L, at times exceeding the MCL of 80 ?g/L in the distribution system. Ozone alone removed total sulfide and reduced UV-254 by about 60% at the Aux Plant and 35% at the Main Plant. Producing an ozone residual of 0.50 mg/L prevented the formation of bromate while removing approximately 35 to 60% concentration of DBP precursors as measured by UV-254. Operating the GAC unit at an empty bed contact time (EBCT) of 10 minutes for the Aux Plant and 5.5 minutes for the Main Plant resulted in 75% and 53% of UV-254 reduction, respectively. The average 120 hour TTHM formation potential for the Aux and Main Plants were 66 ?g/L and 52 ?g/L, respectively, after treatment by ozone and GAC. GAC exhaustion was deemed to have occurred after seven weeks for the Aux Plant and eleven weeks for the Main Plant. The GAC columns operated in three phases: an adsorption phase, a transitional phase, and a biologically activated carbon (BAC) phase. The GAC adsorption phase was found to produce the lowest TTHMs; however, TTHMs remained less than 80 ?g/L during the BAC stage at each plant. BAC exhaustion did not occur during the course of this study. Ozone-GAC reduced chlorine demand by 73% for the Aux Plant and 10% for the Main Plant.
Show less
Date Issued: 2013
Identifier: CFE0004708, ucf:49824
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004708

Title: THE EFFECTS OF WEARABLE FITNESS DEVICES ON PEDIATRIC OBESITY: AN INTEGRATIVE LITERATURE REVIEW.
Creator: Sabina, Kevin, Decker, Jonathan, Hill, Peggy, University of Central Florida
Abstract / Description: Childhood obesity is a foremost concern throughout the health care community. Approximately 17.6% of the pediatric population meet the criteria for obesity, which can lead to health disparities later in life, such as hypertension, type 2 diabetes mellitus, and metabolic syndrome. Emerging mobile and wearable lifestyle tracking devices can be a viable solution to the challenging problem of childhood obesity through behavior changes, feasibility, and adherence. The purpose of this literature...
Show moreChildhood obesity is a foremost concern throughout the health care community. Approximately 17.6% of the pediatric population meet the criteria for obesity, which can lead to health disparities later in life, such as hypertension, type 2 diabetes mellitus, and metabolic syndrome. Emerging mobile and wearable lifestyle tracking devices can be a viable solution to the challenging problem of childhood obesity through behavior changes, feasibility, and adherence. The purpose of this literature review was to determine the effect that mobile and wearable activity tracking devices have on the obese pediatric population. A centralized review of the literature was conducted using various data basesand resulted in 19 articles. 5 articles were chosen to review in more detail. 13 other articles were hand searched through credible resource citations, rendering 14 articles that met all criteria. The three general themes found in this literature review suggest that wearable activity tracking devices can be designed and effectively used by the pediatric population. Also, wearable activity tracking devices are accurate in conveying information on physical activity, calories, and heart rate. Lastly, wearable activity tracking devices can initiate behavioral changes in children leading to an increase in physical activity, resulting in the prevention and treatment of pediatric obesity.While in a majority of the studies analyzed trails were short. The research suggests wearable activity tracking devices will produce the desired results of increased activity in pediatric populations when they are worn correctly, are adequately engaging, and when they are designed in a feasible manner that is appealing to children.
Show less
Date Issued: 2018
Identifier: CFH2000375, ucf:45824
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000375

Title: PHOSPHOLIPASE A2MECHANISM OF INTERFACIAL ACTIVATION,AN INTERDISCLIPLINARY APPROACH.
Creator: Nemec, Kathleen, Tatulian, Suren, University of Central Florida
Abstract / Description: Phospholipase A2 (PLA2) is an enzyme that hydrolyzes the sn-2-ester bond of membrane phospholipids and liberates arachidonic acid, which is converted to eicosanoids that act as potent mediators of inflammation and allergy. As such this enzyme plays a crucial role in many homeostatic physiological and immunologic processes and disease progression. PLA2s undergo substantial increase in activity upon binding to cellular membranes. This effect of interfacial activation is well recognized, yet its...
Show morePhospholipase A2 (PLA2) is an enzyme that hydrolyzes the sn-2-ester bond of membrane phospholipids and liberates arachidonic acid, which is converted to eicosanoids that act as potent mediators of inflammation and allergy. As such this enzyme plays a crucial role in many homeostatic physiological and immunologic processes and disease progression. PLA2s undergo substantial increase in activity upon binding to cellular membranes. This effect of interfacial activation is well recognized, yet its structural and physical aspects are poorly understood. In this work, we have employed the interdisciplinary methods of molecular biology, biochemistry, biophysics, bioinformatics and computational biology, in order to elucidate the structure-function relationships mediating the interfacial activation of human group IIA and group IB PLA2 isoforms. We have evaluated the structural and functional consequences of two conservative, single residue substitutions, located at key membrane-binding and substrate-binding positions of hIIA PLA2. We have also evaluated a human group IB fragment (hIBdeltaN10), missing the first 10 N-terminal residues which make up the N-terminal alpha helix, as well as a chimeric enzyme substituting the N-terminal alpha helix of hIB PLA2 with that from hIIA PLA2 (hIIA/IB PLA2). We have compared the engineered proteins against both the hIIA and hIB PLA2 native enzymes and their N-terminal peptides, N10-hIB and N10-hIIA, respectively. We have developed and used a novel multidisciplinary approach in order to position the segmentally labeled hIB PLA2 and hIIA/IB chimeric PLA2s at the membrane surface. The results of this work provide significant insight into the understanding of the physical aspects of interfacial activation by determining the precise membrane binding modes of PLA2 isoforms and identifying certain amino acid residues and whole protein segments that play key roles in membrane binding, activation, and involved allosteric conformational effects in PLA2s.
Show less
Date Issued: 2006
Identifier: CFE0001324, ucf:47015
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001324

Title: AN OCEAN SURFACE WIND VECTOR MODEL FUNCTION FOR A SPACEBORNE MICROWAVE RADIOMETER AND ITS APPLICATION.
Creator: Soisuvarn, Seubson, Jones, W. Linwood, University of Central Florida
Abstract / Description: Ocean surface wind vectors over the ocean present vital information for scientists and forecasters in their attempt to understand the Earth's global weather and climate. As the demand for global wind velocity information has increased, the number of satellite missions that carry wind-measuring sensors has also increased; however, there are still not sufficient numbers of instruments in orbit today to fulfill the need for operational meteorological and scientific wind vector data. Over the...
Show moreOcean surface wind vectors over the ocean present vital information for scientists and forecasters in their attempt to understand the Earth's global weather and climate. As the demand for global wind velocity information has increased, the number of satellite missions that carry wind-measuring sensors has also increased; however, there are still not sufficient numbers of instruments in orbit today to fulfill the need for operational meteorological and scientific wind vector data. Over the last three decades operational measurements of global ocean wind speeds have been obtained from passive microwave radiometers. Also, vector ocean surface wind data were primarily obtained from several scatterometry missions that have flown since the early 1990's. However, other than SeaSat-A in 1978, there has not been combined active and passive wind measurements on the same satellite until the launch of the second Advanced Earth Observing Satellite (ADEOS-II) in 2002. This mission has provided a unique data set of coincident measurements between the SeaWinds scatterometer and the Advanced Microwave Scanning Radiometer (AMSR). AMSR observes the vertical and horizontal brightness temperature (TB) at six frequency bands between 6.9 GHz and 89.0 GHz. Although these measurements contain some wind direction information, the overlying atmospheric influence can easily obscure this signal and make wind direction retrieval from passive microwave measurements very difficult. However, at radiometer frequencies between 10 and 37 GHz, a certain linear combination of vertical and horizontal brightness temperatures causes the atmospheric dependence to be nearly cancelled and surface parameters such as wind speed, wind direction and sea surface temperature to dominate the resulting signal. This brightness temperature combination may be expressed as ATBV-TBH, where A is a constant to be determined and the TBV and TBH are the brightness temperatures for the vertical and horizontal polarization respectively. In this dissertation, an empirical relationship between the AMSR's ATBV-TBH and SeaWinds' surface wind vector retrievals was established for three microwave frequencies: 10, 18 and 37 GHz. This newly developed model function for a passive microwave radiometer could provide the basis for wind vector retrievals either separately or in combination with scatterometer measurements.
Show less
Date Issued: 2006
Identifier: CFE0001493, ucf:47088
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001493

Title: MARKET FORESIGHT CAPABILITY: DETERMINANTS AND NEW PRODUCT OUTCOMES.
Creator: McCardle, Michael, J. Chris White, Ron Michaels and, University of Central Florida
Abstract / Description: To achieve and maintain a superior competitive position, firms must develop market sensing capability—the ability to sense events and trends in markets ahead of competitors (Day 1994a). According to Day, in firms with superior market sensing capability, “the processes for gathering, interpreting, and using market information are more systematic, thoughtful, and anticipatory than in other firms” [emphasis added]. Although Day asserted that market orientation captures the...
Show moreTo achieve and maintain a superior competitive position, firms must develop market sensing capability—the ability to sense events and trends in markets ahead of competitors (Day 1994a). According to Day, in firms with superior market sensing capability, “the processes for gathering, interpreting, and using market information are more systematic, thoughtful, and anticipatory than in other firms” [emphasis added]. Although Day asserted that market orientation captures the essence of a market sensing capability, researchers have suggested that market orientation, by itself, does not provide the requisite ability to develop competitive advantage because of its focus on detecting rather than anticipating market trends. While prior research, most notably pertaining to market orientation, has addressed the detection of current market trends, a gap in our knowledge remains regarding the ability to anticipate future market conditions. This research seeks to address this lacuna by exploring a firm’s market foresight capability, defined as the organizational capability that allows the firm to anticipate emerging shifts in the market before they are evident to competitors. Organizations possessing superior market foresight capability derive a multitude of benefits from having greater insight into future market conditions. These benefits include the ability to determine which future market trends warrant further exploration and exploitation, the identification of critical resources that will be needed in the future, and-of primary interest in this dissertation—the ability to develop new products that meet customer needs in the future. This research seeks to better inform managers as to the organizational characteristics that enhance the firm’s ability to anticipate future markets by developing and testing a model of the antecedents and new product outcomes of a firm’s market foresight capability. The constructs selected as determinants of market foresight capability are supported by dynamic capability theory, which focuses on the organization’s information processes, learning culture, and coordination/integration influences that elevate lower-level capabilities of individuals and teams to an organization-level or dynamic capability. The organizational information processes that are hypothesized to positively impact market foresight capability include active scanning, market experimentation, and lead user collaboration. The impact of information processes on market foresight capability is contingent on an organization’s learning culture (future orientation and learning orientation) and interdepartmental connectedness, which influence the coordination and integration of information between organizational actors. A firm’s potential for long-term competitive advantage lies in using the insights resulting from its market foresight capability to create advantageous resource configurations. To create valuable resource configurations, the firm with superior market foresight capability must capitalize on its ability to anticipate change through the development of new product and service offerings that better serve the needs of customers. It is hypothesized that superior market foresight capability results in heightened new product creativity, faster speed to market, and better market-entry timing. These new product outcomes of market foresight capability are further hypothesized to lead to superior new product financial performance. Of course, firms cannot realize the hypothesized new product benefits unless they are able to capitalize on market opportunities. Therefore, the relationships between market foresight capability and new product outcomes are hypothesized to be contingent on organizational inertia.
Show less
Date Issued: 2005
Identifier: CFE0000446, ucf:46381
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000446

Title: A STUDY OF EQUATORIAL IONOPSHERIC VARIABILITY USING SIGNAL PROCESSING TECHNIQUES.
Creator: wang, xiaoni, Eastes, Richard, University of Central Florida
Abstract / Description: The dependence of equatorial ionosphere on solar irradiances and geomagnetic activity are studied in this dissertation using signal processing techniques. The statistical time series, digital signal processing and wavelet methods are applied to study the ionospheric variations. The ionospheric data used are the Total Electron Content (TEC) and the critical frequency of the F2 layer (foF2). Solar irradiance data are from recent satellites, the Student Nitric Oxide Explorer (SNOE) satellite and...
Show moreThe dependence of equatorial ionosphere on solar irradiances and geomagnetic activity are studied in this dissertation using signal processing techniques. The statistical time series, digital signal processing and wavelet methods are applied to study the ionospheric variations. The ionospheric data used are the Total Electron Content (TEC) and the critical frequency of the F2 layer (foF2). Solar irradiance data are from recent satellites, the Student Nitric Oxide Explorer (SNOE) satellite and the Thermosphere Ionosphere Mesosphere Energetics Dynamics (TIMED) satellite. The Disturbance Storm-Time (Dst) index is used as a proxy of geomagnetic activity in the equatorial region. The results are summarized as follows. (1) In the short-term variations < 27-days, the previous three days solar irradiances have significant correlation with the present day ionospheric data using TEC, which may contribute 18% of the total variations in the TEC. The 3-day delay between solar irradiances and TEC suggests the effects of neutral densities on the ionosphere. The correlations between solar irradiances and TEC are significantly higher than those using the F10.7 flux, a conventional proxy for short wavelength band of solar irradiances. (2) For variations < 27 days, solar soft X-rays show similar or higher correlations with the ionosphere electron densities than the Extreme Ultraviolet (EUV). The correlations between solar irradiances and foF2 decrease from morning (0.5) to the afternoon (0.1). (3) Geomagnetic activity plays an important role in the ionosphere in short-term variations < 10 days. The average correlation between TEC and Dst is 0.4 at 2-3, 3-5, 5-9 and 9-11 day scales, which is higher than those between foF2 and Dst. The correlations between TEC and Dst increase from morning to afternoon. The moderate/quiet geomagnetic activity plays a distinct role in these short-term variations of the ionosphere (~0.3 correlation).
Show less
Date Issued: 2007
Identifier: CFE0001602, ucf:47188
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001602

Title: HYPERACTIVITY IN BOYS WITH ATTENTION-DEFICIT/HYPERACTIVITY DISORDER: A UBIQUITOUS CORE SYMPTOM OR MANIFESTATION OF WORKING MEMORY DEFICITS?.
Creator: Bolden, Jennifer, Rapport, Mark, University of Central Florida
Abstract / Description: Hyperactivity is currently considered a core and ubiquitous feature of attention-deficit/hyperactivity disorder (ADHD); however, an alternative model challenges this premise and hypothesizes a functional relationship between working memory (WM) and activity level. The current study investigated whether children's activity level is functionally related to WM demands associated with the domain-general central executive and subsidiary storage/rehearsal components using tasks based on...
Show moreHyperactivity is currently considered a core and ubiquitous feature of attention-deficit/hyperactivity disorder (ADHD); however, an alternative model challenges this premise and hypothesizes a functional relationship between working memory (WM) and activity level. The current study investigated whether children's activity level is functionally related to WM demands associated with the domain-general central executive and subsidiary storage/rehearsal components using tasks based on Baddeley's (2007) WM model. Activity level was objectively measured 16 times per second using wrist- and ankle-worn actigraphs while 23 boys between 8 and 12 years of age completed control tasks and visuospatial/phonological WM tasks of increasing memory demands. All children exhibited significantly higher activity rates under all WM relative to control conditions, and children with ADHD (n=12) moved significantly more than typically developing children (n=11) under all conditions. Activity level in all children was associated with central executive but not storage/rehearsal functioning, and higher activity rates exhibited by children with ADHD under control conditions were fully attenuated by removing variance directly related to central executive processes.
Show less
Date Issued: 2008
Identifier: CFE0002455, ucf:47702
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002455

Title: FRAMEWORKS FOR ENVIRONMENTAL POLICYMAKING IN BRAZIL AND CHILE: A COMPARATIVE POLICYMAKING ANALYSIS OF THE BELO MONTE AND HIDROAYS�N DAMS.
Creator: Vogan, Robert J, Wilson, Bruce M., University of Central Florida
Abstract / Description: A global proliferation of large dam construction since the 1950s has been accompanied by scientific research challenging the benefit of these projects while drawing attention to their numerous negative environmental and social impacts. The institutions that assess the costs and benefits associated with large dam proposals, creating policies either approving, altering, or disapproving them, collectively form what is known as a policymaking framework. Examining these frameworks allows observers...
Show moreA global proliferation of large dam construction since the 1950s has been accompanied by scientific research challenging the benefit of these projects while drawing attention to their numerous negative environmental and social impacts. The institutions that assess the costs and benefits associated with large dam proposals, creating policies either approving, altering, or disapproving them, collectively form what is known as a policymaking framework. Examining these frameworks allows observers to trace policies through outlined decision-making processes and can help to reveal inherent biases within those systems that may impact policy outcomes. Often, divergent policy outcomes, like the those observed in the cases of the Belo Monte dam in Brazil and HidroAys�n dam in Chile, are a result of variations in the environmental policymaking frameworks of the deviating cases. The subjects of this study present similar arrangements of costs and benefits but resulted incongruous policy outcomes, specifically that the HidroAys�n dam was not built while the Belo Monte dam is currently under construction. Existing bodies of literature outlining the environmental policymaking frameworks of Chile and Brazil fail to fully address the influence of external variables, including presidential influence, corruption, and electoral politics, on these cases. This project synthesizes an outline of the environmental policymaking frameworks of Chile and Brazil from existing literature and uses the divergent cases of the Belo Monte and HidroAys�n dams to provide evidence for the incorporation of these external variables to better understand the incongruous policy outcomes these frameworks produce.
Show less
Date Issued: 2016
Identifier: CFH2000129, ucf:46011
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000129

Title: REAL-TIME MONOCULAR VISION-BASED TRACKING FOR INTERACTIVE AUGMENTED REALITY.
Creator: Spencer, Lisa, Guha, Ratan, University of Central Florida
Abstract / Description: The need for real-time video analysis is rapidly increasing in today's world. The decreasing cost of powerful processors and the proliferation of affordable cameras, combined with needs for security, methods for searching the growing collection of video data, and an appetite for high-tech entertainment, have produced an environment where video processing is utilized for a wide variety of applications. Tracking is an element in many of these applications, for purposes like detecting anomalous...
Show moreThe need for real-time video analysis is rapidly increasing in today's world. The decreasing cost of powerful processors and the proliferation of affordable cameras, combined with needs for security, methods for searching the growing collection of video data, and an appetite for high-tech entertainment, have produced an environment where video processing is utilized for a wide variety of applications. Tracking is an element in many of these applications, for purposes like detecting anomalous behavior, classifying video clips, and measuring athletic performance. In this dissertation we focus on augmented reality, but the methods and conclusions are applicable to a wide variety of other areas. In particular, our work deals with achieving real-time performance while tracking with augmented reality systems using a minimum set of commercial hardware. We have built prototypes that use both existing technologies and new algorithms we have developed. While performance improvements would be possible with additional hardware, such as multiple cameras or parallel processors, we have concentrated on getting the most performance with the least equipment. Tracking is a broad research area, but an essential component of an augmented reality system. Tracking of some sort is needed to determine the location of scene augmentation. First, we investigated the effects of illumination on the pixel values recorded by a color video camera. We used the results to track a simple solid-colored object in our first augmented reality application. Our second augmented reality application tracks complex non-rigid objects, namely human faces. In the color experiment, we studied the effects of illumination on the color values recorded by a real camera. Human perception is important for many applications, but our focus is on the RGB values available to tracking algorithms. Since the lighting in most environments where video monitoring is done is close to white, (e.g., fluorescent lights in an office, incandescent lights in a home, or direct and indirect sunlight outside,) we looked at the response to "white" light sources as the intensity varied. The red, green, and blue values recorded by the camera can be converted to a number of other color spaces which have been shown to be invariant to various lighting conditions, including view angle, light angle, light intensity, or light color, using models of the physical properties of reflection. Our experiments show how well these derived quantities actually remained constant with real materials, real lights, and real cameras, while still retaining the ability to discriminate between different colors. This color experiment enabled us to find color spaces that were more invariant to changes in illumination intensity than the ones traditionally used. The first augmented reality application tracks a solid colored rectangle and replaces the rectangle with an image, so it appears that the subject is holding a picture instead. Tracking this simple shape is both easy and hard; easy because of the single color and the shape that can be represented by four points or four lines, and hard because there are fewer features available and the color is affected by illumination changes. Many algorithms for tracking fixed shapes do not run in real time or require rich feature sets. We have created a tracking method for simple solid colored objects that uses color and edge information and is fast enough for real-time operation. We also demonstrate a fast deinterlacing method to avoid "tearing" of fast moving edges when recorded by an interlaced camera, and optimization techniques that usually achieved a speedup of about 10 from an implementation that already used optimized image processing library routines. Human faces are complex objects that differ between individuals and undergo non-rigid transformations. Our second augmented reality application detects faces, determines their initial pose, and then tracks changes in real time. The results are displayed as virtual objects overlaid on the real video image. We used existing algorithms for motion detection and face detection. We present a novel method for determining the initial face pose in real time using symmetry. Our face tracking uses existing point tracking methods as well as extensions to Active Appearance Models (AAMs). We also give a new method for integrating detection and tracking data and leveraging the temporal coherence in video data to mitigate the false positive detections. While many face tracking applications assume exactly one face is in the image, our techniques can handle any number of faces. The color experiment along with the two augmented reality applications provide improvements in understanding the effects of illumination intensity changes on recorded colors, as well as better real-time methods for detection and tracking of solid shapes and human faces for augmented reality. These techniques can be applied to other real-time video analysis tasks, such as surveillance and video analysis.
Show less
Date Issued: 2006
Identifier: CFE0001075, ucf:46786
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001075

Title: REDUCTION OF VORTEX-DRIVEN OSCILLATIONS IN A SOLID ROCKET MOTOR COLD FLOW SIMULATION THROUGH ACTIVE CONTROL.
Creator: Ward, Jami, Leonessa, Alexander, University of Central Florida
Abstract / Description: Control of vortex-driven instabilities was demonstrated via a scaled-down, cold-flow simulation that modeled closed-end acoustics. When vortex shedding frequencies couple with the natural acoustic modes of a choked chamber, potentially damaging low-frequency instabilities may arise. Although passive solutions can be effective, an active control solution is preferable. An experiment was performed to demonstrate an active control scheme for the reduction of vortex-driven oscillations. A non...
Show moreControl of vortex-driven instabilities was demonstrated via a scaled-down, cold-flow simulation that modeled closed-end acoustics. When vortex shedding frequencies couple with the natural acoustic modes of a choked chamber, potentially damaging low-frequency instabilities may arise. Although passive solutions can be effective, an active control solution is preferable. An experiment was performed to demonstrate an active control scheme for the reduction of vortex-driven oscillations. A non-reacting experiment using a primary flow of air, where both the duct exit and inlet are choked, simulated the closed-end acoustics. Two plates, separated by 1.27 cm, produced the vortex shedding phenomenon at the chamber's first longitudinal mode. Two active control schemes, closed-loop and open-loop, were studied via a cold-flow simulation for validating the effects of reducing vortex shedding instabilities in the system. Actuation for both control schemes was produced by using a secondary injection method. The actuation system consisted of pulsing compressed air from a modifed, 2-stroke model airplane engine, controlled and powered by a DC motor. The use of open-loop only active control was not highly effective in reducing the amplitude of the first longitudinal acoustic mode, near 93 Hz, when the secondary injection was pulsed at the same modal frequency. This was due to the uncontrolled phasing of the secondary injection system. A Pulse Width Modulated (PWM) signal was added to the open-loop control scheme to correct for improper phasing of the secondary injection flow relative to the primary flow. This addition allowed the motor speed to be intermittently increased to a higher RPM before returning to the desired open-loop control state. This proved to be effective in reducing the pressure disturbance by approximately 46%. A closed-loop control scheme was then test for its effectiveness in controlling the phase of the secondary injection. Feedback of the system's state was determined by placing a dynamic pressure transducer near the chamber exit. Closed-loop active control, using the designed secondary injection system, was proven as an effective means of reducing the problematic instabilities. A 50% reduction in the FFT RMS amplitude was realized by utilizing a Proportional-Derivative controller to modify the phase of the secondary injection.
Show less
Date Issued: 2006
Identifier: CFE0000920, ucf:46728
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000920

Title: REIMAGINING DRUGS: AN ANTHROPOLOGICAL ANALYSIS OF U.S. DRUG POLICY FRAMEWORKS AND STUDENT ACTIVISM.
Creator: Sarmento, Megan A, Harris, Shana, University of Central Florida
Abstract / Description: As the repercussions of the nearly 50-year U.S. War on Drugs are revealing themselves to be harmful and life-threatening, especially to lower-class and minority populations, social movements aimed at drug policy reform have been on the rise. While today's generation of college students were raised on abstinence-based discourses, which constantly warned and threatened them about the dangers of drug use, these same students often change their perspective, some as early as high school, when they...
Show moreAs the repercussions of the nearly 50-year U.S. War on Drugs are revealing themselves to be harmful and life-threatening, especially to lower-class and minority populations, social movements aimed at drug policy reform have been on the rise. While today's generation of college students were raised on abstinence-based discourses, which constantly warned and threatened them about the dangers of drug use, these same students often change their perspective, some as early as high school, when they begin having their own experiences with drugs and engage in more drug-related conversations. As a result, many students become motivated to change drug policy and education and address the stigma associated with drug use in order to reduce drug-related harm to individuals. This thesis examines the ideas and efforts of students at a university in the southeastern United States who are actively engaged in making these changes. Based on interviews with students involved with two drug policy reform groups in 2018, this thesis highlights the role of student activism in the larger drug policy reform movement. Student activists raise awareness of the need for a critical examination of U.S. drug policy frameworks and their place in this endeavor. I argue that student activists' involvement in the drug policy reform movement is motivated by the numerous disparities they experience and observe in the dominant abstinence-based drug approach. Based on these students' perspectives, I argue for a shift towards a more holistic harm reduction education that aims to increase the quality of care and livelihood for drug users, an accomplishment they believe is inextricable from U.S. policy.
Show less
Date Issued: 2018
Identifier: CFH2000439, ucf:45742
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000439

Title: HEALTH INSURANCE STATUS AND DIABETES MANAGEMENT PRACTICES AMONG BLACK ADULTS IN THE U.S.
Creator: Rosier, Luderve, Wells, Brittny, University of Central Florida
Abstract / Description: The purpose of this study was to investigate the relationship between health insurance status and diabetes management (in terms of medication adherence and physical activity levels) in Black adults based on socioeconomic factors. Data were harvested from the Sample Adult Questionnaires of the National Health Interview Survey (NHIS) between the years of 2010 and 2016. The survey questions that were collected included information about the participants' income, education level, insurance status...
Show moreThe purpose of this study was to investigate the relationship between health insurance status and diabetes management (in terms of medication adherence and physical activity levels) in Black adults based on socioeconomic factors. Data were harvested from the Sample Adult Questionnaires of the National Health Interview Survey (NHIS) between the years of 2010 and 2016. The survey questions that were collected included information about the participants' income, education level, insurance status, diabetes diagnosis, medication therapy and physical activity levels. This study employed the most recent version of the Statistical Package for Social Sciences (SPSS) software. The association between diabetes management and socioeconomic factors were analyzed using chi-square analysis. It was hypothesized that Black adults who were uninsured, lower income, and less-educated would report lower adherence to medication and lower physical activity participation when compared to their insured, higher income, and higher-educated counterparts. However, there was no statistically significant relationship between health insurance status and diabetes management in people of different socioeconomic status. Too few people met the weekly recommendations for moderate exercise thus chi-square outcomes for physical activity were invalid. This study will be beneficial for future research as it has provided more generalizable information on this topic due to the use of a national dataset. This study also highlighted the importance of adequate physical activity interventions for this population and can be used for further research on Black adults with diabetes.
Show less
Date Issued: 2018
Identifier: CFH2000303, ucf:45751
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000303

Title: Comparative Analysis of The Effects Of Virtual Reality Active Video Game And Controller-Free Active Video Game Play On Physiological Response, Perceived Exertion, And Hedonic Experience.
Creator: Wooden, Shanon, McCauley, Pamela, Rabelo, Luis, Karwowski, Waldemar, Fukuda, David, University of Central Florida
Abstract / Description: Over 60% of US adults are overweight or obese. Sedentary lifestyles are considered major contributors to the high rates and increasing prevalence of obesity. Physical activity is a critical component in shifting from sedentary lifestyles. Studies indicate that less than half of U.S. adults meet the CDC/ACSM physical activity recommendations. Interactive video games can increase PA, but no study has yet assessed physiologic effort, hedonics, and perceived exertion for playing immersive virtual...
Show moreOver 60% of US adults are overweight or obese. Sedentary lifestyles are considered major contributors to the high rates and increasing prevalence of obesity. Physical activity is a critical component in shifting from sedentary lifestyles. Studies indicate that less than half of U.S. adults meet the CDC/ACSM physical activity recommendations. Interactive video games can increase PA, but no study has yet assessed physiologic effort, hedonics, and perceived exertion for playing immersive virtual reality (VR) and controller-free screen-based active video games (AVGs), compared to treadmill walking and resting. We ran 25 subjects (9 female, 16 male) in 10-minute sessions of five conditions. Head Mounted Display VR: Oculus (Fruit Ninja and Boxing), Screen-based AVG: Kinect (Fruit Ninja and Boxing), and Treadmill walking at 3 mph. One, six-condition (Rest, Treadmill 3.0, Kinect Boxing, Kinect Fruit Ninja, Oculus Boxing, Oculus Fruit Ninja) repeated-measures ANOVA was used to examine differences in HRmean. Three, five-condition (Treadmill 3.0, Kinect Boxing, Kinect Fruit Ninja, Oculus Boxing, Oculus Fruit Ninja) repeated-measures ANOVA were used to examine differences in HRpeak, ratings of perceived exertion (RPE) and Hedonics (Liking). Post hoc analyses using pairwise comparisons were used to further assess significant main effects of the condition. A Pearson's product-moment correlation was run to assess the relationship between activity condition HRmean and RPE VR Boxing elicited the greatest physiological effort, producing vigorous-intensity PA. There was no significant difference in average heart rate for the Treadmill, Kinect Fruit Ninja, Kinect Boxing, and VR Fruit Ninja. Thus, the Kinect and VR sport and casual games are comparable to treadmill walking PA levels and qualify as moderate-intensity activity. The VR Fruit Ninja, VR Boxing, Kinect Fruit Ninja were the most enjoyed activities. Despite having the highest Heart rate and the highest self-reported Rating of Perceived Exertion (RPE), VR Boxing was significantly more enjoyable than Treadmill Walking. There was no statistically significant correlation between Activity Condition HRmean and RPE.Both casual and sports VR and AVG activities are enjoyable activities for adults, stimulating moderate-to-vigorous activity through a traditionally sedentary medium. This research extends previous works in active video gaming effects on physiological cost, perceived exertion and hedonics and fills the gap relating virtual reality active video games. The significance of the research outcomes is that this analysis provides a scientifically validated approach to support the establishment of physical activity level goals and guidelines in the development of active video games as a response and/or remedy to address the sedentary lifestyles that are contributing to American and global obesity.
Show less
Date Issued: 2018
Identifier: CFE0007383, ucf:52065
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007383

Title: Leadership Development Programs in College Athletics: An Exploration of the Student-Athlete Experience.
Creator: Obrien, Jeffrey, Cintron Delgado, Rosa, Owens, J. Thomas, Preston, Michael, Harrison, Carlton, University of Central Florida
Abstract / Description: The purpose of this study was to explore the lived experiences and perceptions of twelve college student-athletes, from two NCAA Division I institutions, who participated in leadership development programs provided by their athletic department. There is a demonstrated need for this level of exploration as evidenced by the growing trend of college athletic departments providing leadership development programming for their respective student-athlete populations. However, there is not a...
Show moreThe purpose of this study was to explore the lived experiences and perceptions of twelve college student-athletes, from two NCAA Division I institutions, who participated in leadership development programs provided by their athletic department. There is a demonstrated need for this level of exploration as evidenced by the growing trend of college athletic departments providing leadership development programming for their respective student-athlete populations. However, there is not a commensurate level of scholarship related to the effectiveness of these programs, nor is there an understanding of the lived experiences of the student-athlete participants that is grounded in research. Therefore, this qualitative study utilized Moustakas' (1994) Transcendental Phenomenology to explore the lived experiences and perceptions of college student-athletes who participated in leadership development programs provided by their athletic department. This study applied Dweck's (2008) theory of Mindset to distill the role effort, failure, and adversity played in the participants lives, and their leadership development. Textural and structural analysis of the data revealed six themes and the essence of the phenomenon. The themes were: (1) Personal Growth and Development; (2) Skill Development; (3) Engaging Pedagogies; (4) Meaning of Effort; (5) Meaning of Failure; and (6) Problem Solving Mindset. Recommendations for college athletic departments implementing leadership development programs include: Intentionality of design; focus on personal growth and development; provide tangible skill development; and include training on growth mindset.
Show less
Date Issued: 2018
Identifier: CFE0007067, ucf:51996
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007067

Title: Long-term Carbon and Copper Impact on Nutrient Removal via Green Sorption Media in Dynamic Linear Ditch Environments.
Creator: Ordonez, Diana, Chang, Ni-bin, Randall, Andrew, Sadmani, A H M Anwar, University of Central Florida
Abstract / Description: Nutrient-laden stormwater runoff causes environmental and ecological impacts on receiving water bodies. Biosorption Activated Media (BAM) composed of the sand, tire crumb, and clay have been implemented in stormwater best management practices due to its ability to efficiently remove nutrients from stormwater runoff, such as in roadside linear ditches, via unique chemophysical and microbiological processes. In this study, a set of fixed-bed columns were set up to simulate some external forces...
Show moreNutrient-laden stormwater runoff causes environmental and ecological impacts on receiving water bodies. Biosorption Activated Media (BAM) composed of the sand, tire crumb, and clay have been implemented in stormwater best management practices due to its ability to efficiently remove nutrients from stormwater runoff, such as in roadside linear ditches, via unique chemophysical and microbiological processes. In this study, a set of fixed-bed columns were set up to simulate some external forces in roadside linear ditches and examine how these external forces affect the performance of BAM. In our experiment, scenario 1 simulates the impact that animals such as tortoises, moles and ants produce conduits on the top layer of BAM. Scenario 2 simulates the presence of animals on BAM, together with external compaction. Finally, scenario 3 simulates external compaction such as traffic compaction alone. Furthermore, two baseline conditions were included to sustain the impact assessment of these three scenarios, respectively. They are the long-term presence of carbon in stormwater as carbon can be transported by stormwater runoff from neighboring crop fields, and the long-term presence of copper ions in stormwater as copper depositions can also be found because of electrical wiring, roofing, stormwater ponds disinfection and automobile brake pads in transportation networks. This systematic assessment encompasses some intertwined field complexity in real world systems driven by different hydraulic conditions, microbial ecology, Dissolved Organic Nitrogen (DON) reshape/removal, and long-term addition of carbon and copper (alone) on the effectiveness of total nitrogen removal. The removal efficiencies are substantially linked to varying microbial processes including mineralization, ammonification, nitrification, denitrification, and even dissimilatory nitrate reduction to ammonium, each of which is controlled by different dominant microbial species. The identification of DON compounds at the molecular level was done via a Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-IR-MS) whereas the quantitation of microbial species was done by using quantitative Polymerase Chain Reaction (qPCR). The results from the interactions between microbial ecology and DON decomposition were compared to the external forces and baseline conditions to obtain a holistic understanding of the removals efficiencies of total nitrogen. With the aid of qPCR and FT-IR-MS, this study concluded that the long-term presence of carbon is beneficial for nutrient removal whereas the long-term copper addition inhibits nutrient removal.
Show less
Date Issued: 2019
Identifier: CFE0007847, ucf:52816
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007847

Title: Magnesium-based treatment for the degradation of octachlorodibenzofuran and trinitrotoluene.
Creator: Mogharbel, Amal, Yestrebsky, Cherie, Beazley, Melanie, Zou, Shengli, Legron-Rodriguez, Tamra, Randall, Andrew, University of Central Florida
Abstract / Description: The aim of the present research is to investigate the efficacy of using ball-milled zero-valent magnesium (ZVMg) with and without activated carbon (AC) for the dechlorination of polychlorinated dibenzofurans. Three different solvent systems are presented here which are ethanol, ethanol/ethyl lactate (90:10), and 2-butoxyethanol. These solvents in combination with ZVMg with and without activated carbon were tested towards the degradation of octachlorodibenzofuran (OCDF, the most highly...
Show moreThe aim of the present research is to investigate the efficacy of using ball-milled zero-valent magnesium (ZVMg) with and without activated carbon (AC) for the dechlorination of polychlorinated dibenzofurans. Three different solvent systems are presented here which are ethanol, ethanol/ethyl lactate (90:10), and 2-butoxyethanol. These solvents in combination with ZVMg with and without activated carbon were tested towards the degradation of octachlorodibenzofuran (OCDF, the most highly chlorinated PCDF congener). All the tested systems were very powerful and reductively dechlorinated OCDF to less chlorinated congeners. However, the system of ball-milled ZVMg and ethanol was the only system which converted OCDF and all byproducts to dibenzofuran, the chlorine- free compound. Kinetic results for all the studied systems fit a pseudo-first-order decay model with respect to OCDF degradation. A detailed study of the formed byproducts during the dechlorination process and a proposed degradation pathway for OCDF are present in this research. The systems consisting of ZVMg and ZVMg/AC in acidified ethanol and acidified 2-butoxyethanol were examined towards the degradation of the low-chlorinated congener 2,8-dichlorodibenzofuran. This compound was degraded efficiently in all systems. The addition of activated carbon enhanced the degradation kinetics of 2,8-dichlorodibenzofuran degradation. Another study using ZVMg and ZVMg/AC in acidified ethanol was conducted to evaluate the efficiency of the system towards the remediation of the explosive contaminant trinitrotoluene (TNT). Both systems were effective in the degradation of TNT and the reactions were found to follow pseudo-first-order kinetics. A plausible degradation pathway is proposed in this study based on the identified degradation products.
Show less
Date Issued: 2018
Identifier: CFE0007761, ucf:52374
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007761

Title: Shape Recovery Behavior of Carbon Nanopaper Shape Memory Polymer Composite.
Creator: Ozdemir, Veli Bugra, Kwok, Kawai, Gou, Jihua, Ghosh, Ranajay, University of Central Florida
Abstract / Description: This thesis presents analytical, experimental and modeling studies of the shape recovery behavior of electrically activated Carbon Nanopaper (CNP) Shape Memory Polymer (SMP)composite. The composite structure studied consists of a CNP layer sandwiched by two SMP layers where the CNP layer acts as a ?exible electrical heater when a voltage difference is applied. The behavior of CNP/SMP composite presents a coupled electrical - thermal - structural problem. The governing equations for the...
Show moreThis thesis presents analytical, experimental and modeling studies of the shape recovery behavior of electrically activated Carbon Nanopaper (CNP) Shape Memory Polymer (SMP)composite. The composite structure studied consists of a CNP layer sandwiched by two SMP layers where the CNP layer acts as a ?exible electrical heater when a voltage difference is applied. The behavior of CNP/SMP composite presents a coupled electrical - thermal - structural problem. The governing equations for the multiphysics behavior are derived. Derived parameters as a result of multiphysics analysis and effects of these parameters on the shape recovery behavior are investigated. The mechanical properties of the carbon nanopaper and viscoelastic properties of the shape memory polymer are characterized. A nonlinear, fully coupled electrical -thermal-structural ?nite element model is developed, and shape recovery experiments are carried out to validate multiphysics analysis and ?nite element model of the shape recovery of the CNP/SMP composite. Finite element model captures the general behavior of shape recovery, but overpredicts shape ?xity and shape recovery rate.
Show less
Date Issued: 2019
Identifier: CFE0007700, ucf:52417
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007700

Title: "Design and Simulation of CMOS RF Active Mixers".
Creator: Gibson, Allen, Yuan, Jiann-Shiun, Wei, Lei, Sundaram, Kalpathy, University of Central Florida
Abstract / Description: This paper introduces a component of the Radio Frequency transceiver called the mixer. The mixer is a critical component in the RF systems, because of its ability for frequency conversion. This passage focuses on the design analysis and simulation of multiple topologies for the active down-conversion mixer. This mixer is characterized by its important design properties which consist of conversion gain, linearity, noise figure, and port isolation. The topologies that are given in this passage...
Show moreThis paper introduces a component of the Radio Frequency transceiver called the mixer. The mixer is a critical component in the RF systems, because of its ability for frequency conversion. This passage focuses on the design analysis and simulation of multiple topologies for the active down-conversion mixer. This mixer is characterized by its important design properties which consist of conversion gain, linearity, noise figure, and port isolation. The topologies that are given in this passage range from the most commonly known mixer design, to implemented design techniques that are used to increase the mixers important design properties as the demand of CMOS technology and the overall RF system rises. All mixer topologies were designed and simulated using TSMC 0.18 (&)#181;m CMOS technology in Advanced Design Systems, a simulator used specifically for RF designs.
Show less
Date Issued: 2011
Identifier: CFE0004112, ucf:49086
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004112

Title: Is Selective Mutism an Emotion Regulation Strategy for Children with Social Phobia? A Single Case Design Investigation.
Creator: Scott, Samantha, Beidel, Deborah, Rapport, Mark, Cassisi, Jeffrey, Hundley, Gulnora, University of Central Florida
Abstract / Description: To determine whether children with selective mutism (SM) withhold speech to regulate their emotional arousal and decrease automatic distress, the current study examines the behavioral and physiological responses of children with SM in comparison to children with social phobia (SP) and children with no psychiatric disorder (TD) as they participate in two social situations. A single case design strategy is used to compare behavioral and physiological responses both within and across groups....
Show moreTo determine whether children with selective mutism (SM) withhold speech to regulate their emotional arousal and decrease automatic distress, the current study examines the behavioral and physiological responses of children with SM in comparison to children with social phobia (SP) and children with no psychiatric disorder (TD) as they participate in two social situations. A single case design strategy is used to compare behavioral and physiological responses both within and across groups. Examining the temporal sequencing of behaviors and physiology provides a direct test of the utility of emotion regulation theory as it pertains to children with social phobia/selective mutism. The results indicate that children with SM show elevated arousal and emotional reactivity across all interaction segments relative to other children. Unique affective, behavioral and physiological responses occur between and within groups in relation to situational demands. The temporal sequencing of behavioral and physiological responses suggests that behavioral deficits may be related to underutilized and/or deficient physiological response systems and that not speaking represents a primitive avoidance strategy by children with SM to regulate extreme physiological arousal.
Show less
Date Issued: 2012
Identifier: CFE0004438, ucf:49348
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004438

physical activity (9)	+ -
activism (7)	+ -
Physical Activity (5)	+ -
Political activity (4)	+ -
Active Learning (3)	+ -

Activity Recognition (3)	+ -
diet (3)	+ -
digital activism (3)	+ -
nitrate (3)	+ -
BAM (2)	+ -
Biosorption Activated Media (2)	+ -
EU (2)	+ -
Exercise (2)	+ -
Facebook (2)	+ -
Heart Rate (2)	+ -
Labor (2)	+ -
Machine Learning (2)	+ -
Millennials (2)	+ -
Optimization (2)	+ -
Peace (2)	+ -
Phospholipase A2 (2)	+ -
Simulation (2)	+ -
Students (2)	+ -
Working class (2)	+ -
active learning (2)	+ -
activity theory (2)	+ -
adolescents (2)	+ -
adsorption (2)	+ -
autism (2)	+ -
clay (2)	+ -

ETD Collection (96)	+ -
Honors Collection (15)	+ -
PRISM: Political & Rights Issues & Social Movements (6)	+ -

United States (3)	+ -
Germany (1)	+ -
Hollywood (1)	+ -

University of Central Florida (111)	+ -
Randall, Andrew (8)	+ -
Duranceau, Steven (6)	+ -
Fukuda, David (5)	+ -
Shah, Mubarak (5)	+ -

Search In

Pages

Pages

Sort Results By:

Narrow results by:

Topical Subject

Collection

Geographic Subject

Genre

Type of Resource

Language

Creator

Format

Owner