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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: Message Prioritization in Computer-Mediated Communication: A Study of Mobile Device Use in the Classroom.
Creator: Wills, Paul, Malala, John, Hastings, Sally, Miller, Ann, University of Central Florida
Abstract / Description: College students are using their mobile devices during class and this research investigates different aspects of why college students feel so inclined to use these devices during class as well as by what means are students using to participate in computer-mediated communication while simultaneously engaging in classes. This research surveyed 146 students on their perceived use of their own mobile device use during class. The study compared how often different types of devices, such as mobile...
Show moreCollege students are using their mobile devices during class and this research investigates different aspects of why college students feel so inclined to use these devices during class as well as by what means are students using to participate in computer-mediated communication while simultaneously engaging in classes. This research surveyed 146 students on their perceived use of their own mobile device use during class. The study compared how often different types of devices, such as mobile phones, tablets, and laptops, and different types of social media outlets, like Facebook, Twitter, and other social media websites, were used during class. The study compares these devices and media outlets to students' perception of the levels of incivility of using these various means of communication during class and their perceptions of how they impact their ability to focus on the class. Mobile phones, Facebook, and Twitter use were negatively associated with the perception of the incivility of use in the classroom. This research found phone use was viewed as more uncivil than tablets and tablet use was viewed as more uncivil than laptop use. In addition, students' perceptions of instructors' tolerance of mobile phone and laptop use was negatively associated with their perception of the incivility of using those devices during class. All three tested mobile devices and all three tested social media outlets were positively associated with students' perception that its use affects their ability to focus on the class. This research found mobile phones use as more distracting than laptops and laptops use as more distracting than tablets. ?
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Date Issued: 2013
Identifier: CFE0005073, ucf:49958
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005073

Title: Examining Facebook as a Digitally Immersive Language Environment for French Language Learners.
Creator: Wyatt, Shelly, Gunter, Glenda, Witta, Eleanor, Boyd, Tammy, Crevecoeur, Edwidge, Metcalf, David, University of Central Florida
Abstract / Description: This quasi-experimental study examined the impact of interactions with native French language Facebook posts on beginning French language learners' willingness to communicate (WTC) and their attitudes towards the target language and culture in a university setting. In addition, the degree of interaction, by participants, with the French language Facebook posts was recorded and analyzed. This study was conducted during the Spring 2013 semester at the University of Central Florida in Orlando,...
Show moreThis quasi-experimental study examined the impact of interactions with native French language Facebook posts on beginning French language learners' willingness to communicate (WTC) and their attitudes towards the target language and culture in a university setting. In addition, the degree of interaction, by participants, with the French language Facebook posts was recorded and analyzed. This study was conducted during the Spring 2013 semester at the University of Central Florida in Orlando, Florida. Participants in this study were recruited from two sections of FRE 1120, Elementary French Language and Civilization I. Native French language Facebook posts were (")pushed(") to participants' personal Facebook News Feeds over the course of four weeks, with posts pushed on weekdays only and Facebook polls asking for participant feedback on Fridays. Two instruments were used in this study to obtain participants' demographic information and to measure willingness to communicate as well attitudes towards the target language and culture. In addition, the researcher gathered observational data directly from Facebook.Data were analyzed using a Split-plot ANOVA and descriptive statistics. A total of 26 participants completed the study, with 14 participants in the control group and 12 participants in the treatment group. Both sections of FRE 1120 were conducted in a traditional, face-to-face format and were taught by the same instructor. Results indicated that participants' willingness to communicate in French and their attitudes towards the target language and culture were not significantly impacted by interaction with native French language Facebook posts. The level of Facebook-facilitated interactions in all areas, including (")Liking,(") Sharing,(") and (")Commenting(") was low. Self-reported interactions, including reading, viewing and translating of French language Facebook posts; Reading and viewing posts (such as simply viewing a photo) was the most frequently reported interaction, with (")Commenting(") and (")Sharing(") was the least common interaction. Opportunities for future research are numerous and include increasing the size of the sample, increasing the length of the study, and selected participants' who are more advanced in their mastery of the target language. The potential of social network sites to serve as digitally immersive environments for foreign language learners should be explored in more depth and across various languages.
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Date Issued: 2013
Identifier: CFE0005076, ucf:49957
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005076

Title: Advertising Risk: A Comparative Content Analysis of Contraceptive Advertisements Targeting Black and White Women.
Creator: Rogers, Tiffany, Carter, Shannon, Grauerholz, Liz, Broome, Amy, University of Central Florida
Abstract / Description: This research compared contraceptive advertisements in two top-circulated publications for white and African American female subscribers, Cosmopolitan and Essence. Data consisted of a sample of 172 contraceptive advertisements from the two magazines published between 1992 and 2012. Quantitative analysis focused on the model(s)' race, age, marital status, and socioeconomic status; the type of contraceptive being advertised; and the reason stated in the ad for using the product. This analysis...
Show moreThis research compared contraceptive advertisements in two top-circulated publications for white and African American female subscribers, Cosmopolitan and Essence. Data consisted of a sample of 172 contraceptive advertisements from the two magazines published between 1992 and 2012. Quantitative analysis focused on the model(s)' race, age, marital status, and socioeconomic status; the type of contraceptive being advertised; and the reason stated in the ad for using the product. This analysis determined a disparity in the rate of advertisement of doctor-administered contraceptives for the publications of 25.4 percent in Essence magazine and 9.5 percent in Cosmopolitan magazine. Black women were targeted with long-term, doctor-administered birth control ads more frequently than white women over a twenty-year period, which correlates with findings of previous studies suggesting minority women receive these types of birth control more often than their white counterparts. Qualitative analysis focused on the written messages in the advertisements. This analysis identified the theme of risk as a prominent message of advertisements, appealing to concerns surrounding health, desirability, freedom and pregnancy.
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Date Issued: 2014
Identifier: CFE0005406, ucf:50408
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005406

Title: Functional Characterization of Green Sorption Media and Scaling of Pilot Studies for Copper Removal in Stormwater Runoff.
Creator: Houmann, Cameron, Chang, Ni-bin, Wanielista, Martin, Lee, Woo Hyoung, University of Central Florida
Abstract / Description: Green adsorption media with the inclusion of renewable and recycled materials can be applied as a stormwater best management practice for copper removal. A green adsorption media mixture composed of recycled tire chunk, expanded clay aggregate, and coconut coir was physicochemically evaluated for its potential use in an upflow media filter. The results found that the use of the green adsorption media mixture in isolation or the coconut coir with an expanded clay filtration chamber could be an...
Show moreGreen adsorption media with the inclusion of renewable and recycled materials can be applied as a stormwater best management practice for copper removal. A green adsorption media mixture composed of recycled tire chunk, expanded clay aggregate, and coconut coir was physicochemically evaluated for its potential use in an upflow media filter. The results found that the use of the green adsorption media mixture in isolation or the coconut coir with an expanded clay filtration chamber could be an effective and reliable stormwater best management practice for copper removal. A suite of tests were conducted on the media mixture and the individual media components including studies of isotherm, reaction kinetics, column adsorption and reaction kinetics. Batch adsorption tests revealed that the media and media mixture follow both the Freundlich and Langmuir isotherm models and that the coconut coir had the highest affinity for copper. A screening of desorbing agents revealed that hydrochloric acid has good potential for copper desorption, while batch tests for desorption with hydrochloric acid as the desorbing agent showed the data fit the Freundlich isotherm model. Reaction kinetics revealed that the adsorption reaction took less than 1 hour to reach equilibrium and that it followed pseudo-second order kinetics for the mixture and coconut. Desorption kinetic data had high correlation with the pseudo-second order model and revealed a rapid desorption reaction. Batch equilibrium data over 3 adsorption/desorption cycles found that the coconut coir and media mixture were the most resilient and demonstrated that they could be used through 3 or more adsorption/desorption cycles. The coconut coir also performed the best under dynamic conditions, having an equilibrium uptake of 1.63 mg?g-1, compared to 0.021 mg?g-1 at an influent concentration of 1.0 mg?L-1 and a hydraulic retention time of 30 minutes. A physical evaluation of the media found the macro-scale properties, such as particle size distribution and mass-volume relationships, and observed the micro-scale properties such as surface and pore microstructures, crystalline structures, and elemental composition. FE-SEM imaging found a strong correlation between the porosity of the micro pore structure and the adsorptive capacity. The equilibrium and dynamic adsorption testing results were confirmed by elemental analysis, which showed measureable quantities of copper in the coconut coir and media mixture after adsorption followed by partial desorption. A new scaling-up theory was developed through a joint consideration of the Damk(&)#246;hler and P(&)#233;clet numbers for a constant media particle size such that a balance between transport-controlled and reaction-controlled kinetics can be harmonized. A series of column breakthrough tests at varying hydraulic residence times revealed a clear peak adsorptive capacity for the media mixture at a Damk(&)#246;hler number of 2.7. The P(&)#233;clet numbers for the column breakthrough tests indicated that mechanical dispersion is an important effect that requires further consideration in the scaling-up process. However, perfect similitude of the Damk(&)#246;hler number cannot be maintained for a constant media particle size, and relaxation of hydrodynamic similitude through variation of the P(&)#233;clet number must occur.
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Date Issued: 2015
Identifier: CFE0005630, ucf:50205
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005630

Title: Let's take a selfie! Living in a Snapchat beauty filtered world:The impact it has on women's beauty perceptions.
Creator: Cruz, Angelina, Hastings, Sally, Hanlon, Christine, Kinnally, William, University of Central Florida
Abstract / Description: Snapchat's beauty filters have become a prominent force in the social media realm. It's vital in understanding the impact in how Snapchat's beauty filters shape beauty standards among young women. This became the primary motivation of conducting this qualitative study. Six focus groups were conducted to explore the depths of why female college students between the ages of 18-25 decide to post either selfies with Snapchat's beauty filters applied or natural images. Dialectical tensions theory...
Show moreSnapchat's beauty filters have become a prominent force in the social media realm. It's vital in understanding the impact in how Snapchat's beauty filters shape beauty standards among young women. This became the primary motivation of conducting this qualitative study. Six focus groups were conducted to explore the depths of why female college students between the ages of 18-25 decide to post either selfies with Snapchat's beauty filters applied or natural images. Dialectical tensions theory was used as the foundation for this study to explore both the internal and external discursive struggles young women face when deciding to post natural or filtered selfies on their social media accounts. Integrating impression management, self-objectification, and self-esteem as components of understanding this phenomenon and using a thematic analysis to uncover prevalent and reoccurring themes discussed in the focus groups yielded remarkable results. Themes of perceptions of attractiveness, presenting a fa(&)#231;ade, and the power of self-esteem highlighted possible reasons why women were attracted in utilizing Snapchat's beauty filters or posting natural images. Findings also showed how the internal struggles between perfectionism-reality and external struggles of fitting in-standing out from the crowd became tensions women were often plagued in decision making to post natural or filtered images. This study serves as an epitome for beauty standards imposed in social media especially in HVSM (highly visual social media) sites like Snapchat and Instagram. There's limited research on Snapchat filters and the implications it has on females' overall perceptions of themselves of whether to implement filters within their photos. Understanding the reasons why women feel the need to use beauty filters or post natural selfies through a discussion-based setting embarked discoveries of how the media and society should integrate new sets of beauty standards.
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Date Issued: 2019
Identifier: CFE0007619, ucf:52519
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007619

Title: Examining presence and influence of linguistic characteristics in the Twitter discourse surrounding the women's right to drive movement in Saudi Arabia.
Creator: Sahly, Abdulsamad, Kinnally, William, Neuberger, Lindsay, Miller, Ann, University of Central Florida
Abstract / Description: Social media platforms like Facebook and Twitter have been popular tools for social and political movements in non-democratic societies in which traditional media outlets are under government control. Activists in Saudi Arabia, particularly women, have launched several campaigns through social media to demand the right to drive for women. This study used framing theory as the foundation for looking at the degree to which cognitive, emotion, and religious or moral language has been used to...
Show moreSocial media platforms like Facebook and Twitter have been popular tools for social and political movements in non-democratic societies in which traditional media outlets are under government control. Activists in Saudi Arabia, particularly women, have launched several campaigns through social media to demand the right to drive for women. This study used framing theory as the foundation for looking at the degree to which cognitive, emotion, and religious or moral language has been used to frame discussion of this issue on Twitter. Additionally, this study observed the relationship between these linguistic attributes in Twitter and retweeting behavior to understand the characteristics of the discourse that relate to the potential influence of the message. The results suggested that, within the sociopolitical discussion in social media, cognitive language was expressed the most often, particularly insight and causation language. The results also suggested that tweets containing cognitive language are more likely to be retweeted than those with emotion language. However, among the components of cognitive and emotion language, anger was the strongest specific predictor of retweeting behavior. The implications of the presence of linguistic attributes and their relationship to retweeting behavior and suggestions for future communication research within the context of social and political movements are discussed.
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Date Issued: 2016
Identifier: CFE0006386, ucf:51535
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006386

Title: MYSPACE OR OURSPACE: A MEDIA SYSTEM DEPENDENCY VIEW OF MYSPACE.
Creator: Schrock, Andrew, Brown, Timothy, University of Central Florida
Abstract / Description: MySpace is a type of "social networking" website where people meet, socialize, and create friendships. The way MySpace members, particularly younger individuals, interact online underscores the changing nature of mass media. Media system dependency states that individuals become reliant on media in their daily life because of fundamental human goals. This reliance, termed a dependency, leads to repeated use. Media system dependency was applied in the current study to explain how and why...
Show moreMySpace is a type of "social networking" website where people meet, socialize, and create friendships. The way MySpace members, particularly younger individuals, interact online underscores the changing nature of mass media. Media system dependency states that individuals become reliant on media in their daily life because of fundamental human goals. This reliance, termed a dependency, leads to repeated use. Media system dependency was applied in the current study to explain how and why individuals became habitual MySpace users. To attain results a survey was administered to a convenience sampling of 401 adult undergraduates at the University of Central Florida. Members reported MySpace dependency had a moderate correlation to MySpace use, and they actively used the website an average of 1.3 hours of use per day. Results indicated members use MySpace to primarily satisfy play and interaction orientation dependencies. MySpace use was found to have a correlation with number of MySpace friends. "Number of friends created" in turn had a correlation with MySpace dependency, as people returned to interact with their friends. Individual factors were also found to be a source of influence in MySpace dependency. These individual factors were demographics, psychological factors related to use of the Internet, and psychological factors related to use of MySpace. Factors related to MySpace, extroversion and self-disclosure, were positively correlated with intensity of dependency. The influence of factors related to the Internet was partly supported; computer self-efficacy was not significantly related to MySpace dependency, while computer anxiety was significantly related to MySpace dependency. Speed of connection to the Internet and available time to use the Internet were not related to MySpace dependency. Additionally, significant differences were found between genders in overall dependency, extroversion, self-disclosure, computer anxiety, and computer self-efficacy. These findings provide evidence that MySpace members were little, if at all, constrained by factors related to use of the Internet, but were attracted to the websites for similar reasons as real-life relationships. Finally, MySpace is just one of the large number of online resources that are predominantly social, such as email, message boards, and online chat. This study found that through a "technology cluster" MySpace members use these other social innovations more frequently than non-members. However, members also used significantly more non-social innovations, which may indicate that MySpace members are part of a larger technology cluster than anticipated or perhaps are in the same category of innovation adopter.
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Date Issued: 2006
Identifier: CFE0001451, ucf:47057
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001451

Title: THE DEVELOPMENT OF LOOP-BASED CINEMATIC TECHNIQUES IN TWENTIETH CENTURY MOTION PICTURES AND THEIR APPLICATION IN EARLY DIGITAL CINEMA.
Creator: Scoma, David, Scott, Blake, University of Central Florida
Abstract / Description: For centuries, repetition in one form or another has been seen as a significant element in the artistic palette. In numerous formats of expression, duplication and looping became a significant tool utilized by artisans in a multitude of creative formats. Yet within the realm of film, the Griffith and Eisenstein models of cinematic editing techniques (as the most popular-- and near-monolithic--narrative aesthetic criteria) effectively disregarded most other approaches, including looping....
Show moreFor centuries, repetition in one form or another has been seen as a significant element in the artistic palette. In numerous formats of expression, duplication and looping became a significant tool utilized by artisans in a multitude of creative formats. Yet within the realm of film, the Griffith and Eisenstein models of cinematic editing techniques (as the most popular-- and near-monolithic--narrative aesthetic criteria) effectively disregarded most other approaches, including looping. Despite the evidence for the consistent use of repetition and looping in multiple ways throughout the course of cinematic history, some theorists and practitioners maintain that the influx of the technique within digital cinema in recent years represents a sudden breakthrough, one that has arrived simply because technology has currently advanced to a point where their utilization within digital formats now makes sense both technologically and aesthetically. This situation points to a cyclical problem. Students of film and video frequently are not taught aesthetical or editorial options other than standard industry procedures. Those who are interested in varying techniques are therefore put in the position of having to learn alternative practices on their own. When they do look beyond visual norms to try applying different approaches in their projects, they risk going against the views of their instructors who are only interested in implementations of the standard methods which have been in the forefront for so long. Yet the loop's importance and prevalence as a digital language tool will only likely grow with the evolution of digital cinema. With this is mind, the dissertation addresses the following questions: To what extent can various forms of repetitive visuals be found throughout film history, and are not simply technical manifestations that have merely emerged within digital cinema? How might current educational practices in the realm of film and video work to inform students of techniques outside of the common narrative means? Finally, what other sources or strategies might be available to enlighten students and practitioners exploring both the history surrounding--and possible applications of--techniques based upon early cinema practices such as the loop?
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Date Issued: 2008
Identifier: CFE0002464, ucf:47720
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002464

Title: PREDICTING THE PERFORMANCE OF INTERPRETING INSTRUCTION BASED ON DIGITAL PROPENSITY INDEX SCORE IN TEXT AND GRAPHIC FORMATS.
Creator: Norman, David, Hirumi, Atsusi, University of Central Florida
Abstract / Description: Practitioners have proposed that Digital Natives prefer graphics while Digital Immigrants prefer text. While Instructional Design has been extensively studied and researched, the impact of the graphical emphasis in instructional designs as it relates to digital propensity has not been widely explored. Specifically, this study examined the performance of students when presented with text-only and graphic-only instructional formats. The purpose of this study was to test the relationship between...
Show morePractitioners have proposed that Digital Natives prefer graphics while Digital Immigrants prefer text. While Instructional Design has been extensively studied and researched, the impact of the graphical emphasis in instructional designs as it relates to digital propensity has not been widely explored. Specifically, this study examined the performance of students when presented with text-only and graphic-only instructional formats. The purpose of this study was to test the relationship between Digital Propensity Index scores of individuals and their performance when interpreting online instruction. A sample of students from the population of a large metropolitan university received the Digital Propensity Index questionnaire, which is a measure of an individual's time spent interacting with digital media. Each student was randomly assigned varying formats of a computer-based instructional unit via a public survey. The instructional unit consisted of the DPI questionnaire and six tasks related to the Central Florida commuter rail system. Participants were asked to answer the DPI questionnaire on a website by clicking on a link in an emailed invitation. Following the DPI questionnaire, participants were randomly assigned to one of two groups. Group One saw three instructional tasks shown in text and shuffled in random order. Each task was displayed on its own webpage. By submitting an answer to the task, the group progressed through the website to the next task. Group Two saw graphic tasks first, again, shuffled in random order. After the first three tasks, the groups swapped instructional formats to view the opposing group's initial questions. Participants were timed on how many seconds they spent reviewing each task. Each task had an assessment question to evaluate the learning outcomes of the instructional unit. Finally, the DPI score of the participant was matched with the time spent viewing each presentation format. The findings indicate that DPI score had a statistically significant prediction of time spent navigating each type of instruction. Though the link between DPI score and time spent navigating instruction was statistically significant, the actual measurable time difference between navigating text and graphic formats was only a fraction of a second for each increment in DPI score. Limitations and potential future research related to the study are discussed as well.
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Date Issued: 2008
Identifier: CFE0002234, ucf:47896
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002234

Title: Social Media Usage by Municipal Elected Officials for Open Government Community Engagement.
Creator: Stoeckel, Sarah, Bryer, Thomas, Mitchell, David, Hu, Qian, Brown, Tim, University of Central Florida
Abstract / Description: As public administration has evolved with the technological advances in today's society, it can be challenging to ensure the demands of the public are being met in terms of efficiency, effectiveness, and engagement. Nonetheless, a focus on community remains at the forefront of public administration. When looking at technology and the community, the tool known as social media emerges. Social media has allowed people to interact in new ways and therefore, has allowed the government to interact...
Show moreAs public administration has evolved with the technological advances in today's society, it can be challenging to ensure the demands of the public are being met in terms of efficiency, effectiveness, and engagement. Nonetheless, a focus on community remains at the forefront of public administration. When looking at technology and the community, the tool known as social media emerges. Social media has allowed people to interact in new ways and therefore, has allowed the government to interact with citizens in ways they have not been able to in the past. In addition to attempting to modernize public administration, there has been an increased focus on building citizen trust through providing a more open government structure. The Open Government Directive issued by President Barack Obama focused on three tenets, which included transparency, participation, and collaboration. One of the ways government entities within the United States are strengthening these areas is through the implementation of various social media sites as a means to stay connected with citizens. With an increase of users utilizing social media tools for both information and connection, many government departments and agencies have incorporated social media use into their workplace as a function for their department. However, it is elected officials that are the ones who represent the citizens from their governmental role and thus, can aid in bridging the gap between citizens and government. Yet, there is little research on how elected officials, specifically in municipalities, are utilizing social media to connect with their constituents. This study discusses social media use by municipal elected officials and how it relates to open government community engagement. Open government community engagement is defined in terms of the three tenets of the Open Government Directive: transparency, participation, and collaboration encompassing the rungs of Arnstein's ladder of citizen participation. For this qualitative study, fifty-seven Florida municipal elected officials were interviewed regarding their social media use or lack thereof in terms of engagement with citizens. The interviews are followed-up with content analysis of social media sites. An ethnographic approach is utilized to uncover and develop common themes related to open government community engagement. The findings suggest while some municipal elected officials are utilizing social media well in terms of open government community engagement, there is a lack of clear understanding of social media use within the context of the Sunshine Law, as well as other barriers prohibiting utilizing social media for more of the participation and collaboration components. There are several reasons municipal elected officials opt to avoid social media altogether, while additional concepts related to open government limited engagement and closed government community engagement are explored. The concept of avoidance was addressed, especially as it pertained to the practical implications for both city administrators and elected officials.
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Date Issued: 2018
Identifier: CFE0007377, ucf:52083
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007377

Title: Understanding Crisis Communication and Mobility Resilience during Disasters from Social Media.
Creator: Roy, Kamol, Hasan, Samiul, Eluru, Naveen, Wu, Yina, University of Central Florida
Abstract / Description: Rapid communication during extreme events is one of the critical aspects of successful disaster management strategies. Due to their ubiquitous nature, social media platforms offer a unique opportunity for crisis communication. Moreover, social media usage on GPS enabled devices such as smartphones allow us to collect human movement data which can help understanding mobility during a disaster. This study leverages social media (Twitter) data to understand the effectiveness of social media...
Show moreRapid communication during extreme events is one of the critical aspects of successful disaster management strategies. Due to their ubiquitous nature, social media platforms offer a unique opportunity for crisis communication. Moreover, social media usage on GPS enabled devices such as smartphones allow us to collect human movement data which can help understanding mobility during a disaster. This study leverages social media (Twitter) data to understand the effectiveness of social media-based communication and the resilience of human mobility during a disaster. This thesis has two major contributions. First, about 52.5 million tweets related to hurricane Sandy are analyzed to assess the effectiveness of social media communication during disasters and identify the contributing factors leading to effective crisis communication strategies. Effectiveness of a social media user is defined as the ratio of attention gained over the number of tweets posted. A model is developed to explain more effective users based on several relevant features. Results indicate that during a disaster event, only few social media users become highly effective in gaining attention. In addition, effectiveness does not depend on the frequency of tweeting activity only; instead it depends on the number of followers and friends, user category, bot score (controlled by a human or a machine), and activity patterns (predictability of activity frequency). Second, to quantify the impacts of an extreme event to human movements, we introduce the concept of mobility resilience which is defined as the ability of a mobility infrastructure system to manage shocks and return to a steady state in response to an extreme event. We present a method to detect extreme events from geo-located movement data and to measure mobility resilience and loss of resilience due to those events. Applying this method, we measure resilience metrics from geo-located social media data for multiple types of disasters occurred all over the world. Quantifying mobility resilience may help us to assess the higher-order socio-economic impacts of extreme events and guide policies towards developing resilient infrastructures as well as a nation's overall disaster resilience.
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Date Issued: 2018
Identifier: CFE0007362, ucf:52090
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007362

Title: Effects of Electronic Media Messages on the Perceived Self-Efficacy of Pedestrian Commuters Living in the Unincorporated Central Florida Community of Conway.
Creator: Stephens, Daniel, Yu, Chia-Yuan, Martin, Lawrence, Hawkins, Christopher, Seigler, Daniel, University of Central Florida
Abstract / Description: Urban pedestrianism is increasingly perceived as a dangerous form of travel. While roadway design has been historically scaled to cars instead of people, planning professionals are now re-thinking their approach to make roads more inclusive for all travelers. Scholars, however, have learned harbored fear can trump behavior even under ideal travel conditions. Such fear can adversely impact perceived pedestrian self-efficacy, which is the self-generated internal assessment or belief in a...
Show moreUrban pedestrianism is increasingly perceived as a dangerous form of travel. While roadway design has been historically scaled to cars instead of people, planning professionals are now re-thinking their approach to make roads more inclusive for all travelers. Scholars, however, have learned harbored fear can trump behavior even under ideal travel conditions. Such fear can adversely impact perceived pedestrian self-efficacy, which is the self-generated internal assessment or belief in a traveler's agentive abilities to navigate the travel environment. The challenge thus becomes twofold: improve the built environment while bolstering traveler confidence. The following study, therefore, employed a qualitative phenomenological research design to ascertain the concerns and perceptions of vulnerable travelers as it pertained to and was affected by travel-specific media. The study employed denizens selected from the Central Florida community of Conway, who were interviewed using a multi-method approach employing a semi-structured interview technique utilizing individual interviews and small focus group sessions. Using Social Cognitive Theory (SCT) as the theoretical framework, the researcher studied and documented the elements contributing to the perceptions of pedestrian travelers. The rationale for this approach is found in the dynamic relationships that exist between the objective travel environment, the perceived travel environment, and travel behavior (-) all representing the triad of cognition, the external environment, and social stimuli, which encompass Bandura's Triadic Reciprocal Determinism (TRD). The four themes that emerged from the data analysis (-) communication, safety, cost, and happiness (-) characterize the experiences of the participants as they watched positively-themed media images modeling civil travel behavior. This research adds to existing literature on the magnitude such themes have on perception, to include latent perceptions harbored by pedestrian commuters concerning dangers (-) real or imagined (-) of traveling on local roadways.
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Date Issued: 2018
Identifier: CFE0007376, ucf:52100
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007376

Title: Holding off on the fun stuff: Academic media multitasking and binge watching among college students.
Creator: Merrill, Kelly, Rubenking, Bridget, Kinnally, William, Sellnow, Deanna, University of Central Florida
Abstract / Description: College students are often faced with the temptation of engaging in academic media multitasking and binge watching or completing their academic coursework in a timely and effective manner. A quantitative survey (N = 651) explored trait individual differences in self-control and academic delay of gratification and situational individual differences in enjoyment, reward, procrastination, regret, and guilt as predictors of academic media multitasking frequency, binge watching frequency, and...
Show moreCollege students are often faced with the temptation of engaging in academic media multitasking and binge watching or completing their academic coursework in a timely and effective manner. A quantitative survey (N = 651) explored trait individual differences in self-control and academic delay of gratification and situational individual differences in enjoyment, reward, procrastination, regret, and guilt as predictors of academic media multitasking frequency, binge watching frequency, and binge watching duration. Stepwise regressions reveal that self-control is not a predictor of these media behaviors, while age and greater enjoyment were the only predictors of academic media multitasking and gender and greater enjoyment were the only predictors of binge watching duration. On the other hand, the other five variables provided insight on what predicted binge watching frequency: academic delay of gratification, reward, procrastination, regret, and guilt. Greater self-control also led to greater academic delay of gratification. Lastly, there were small positive correlations between all of the media behaviors except for academic media multitasking and binge watching frequency. Practical and theoretical implications are discussed.
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Date Issued: 2018
Identifier: CFE0007053, ucf:51989
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007053

Title: Digital Citizenship Tools for Cause-Based Campaigns: A Broadened Spectrum of Social Media Engagement and Participation-Scale Methodology.
Creator: Miller, Jennifer, Vie, Stephanie, Scott, Blake, Flammia, Madelyn, St. Amant, Kirk, University of Central Florida
Abstract / Description: Digital Citizenship Tools for Cause-Based Campaigns: A Broadened Spectrum of Social Media Engagement and Participation-Scale Methodology develops and applies two new tools for understanding, measuring, and recursively adjusting small to medium-size social media-based philanthropic campaigns to better foster participation and engagement(-)in other words, democratic digital citizenship. First, a theoretical model is offered broadening current binary conceptions of success and failure or impact...
Show moreDigital Citizenship Tools for Cause-Based Campaigns: A Broadened Spectrum of Social Media Engagement and Participation-Scale Methodology develops and applies two new tools for understanding, measuring, and recursively adjusting small to medium-size social media-based philanthropic campaigns to better foster participation and engagement(-)in other words, democratic digital citizenship. First, a theoretical model is offered broadening current binary conceptions of success and failure or impact of campaigns, situating specific participant actions in social media on a spectrum. Then, from that model, a new methodology is provided to measure participation and engagement generated by campaign posts. Recommendations are also offered for recursively adjusting campaign posts to better foster democratic digital citizenship. These tools were developed from data generated by #TheFaceOffChallenge, a research project representative of a typical small to medium-size cause-based campaign. #TheFaceOffChallenge also serves as a sample for analysis illustrating how to use these tools. While explicating these tools, this dissertation explores a broad range of topics related to better understanding democratic digital citizenship: online philanthropy, awareness, and digital activism; viral and memetic transmission; tensions between consumption and creation of ideas, content, and knowledge; public(s), counterpublics, and counter-efforts; literacies and access for engagement and participation in algorithmic environments; and visual communication and semiotics.
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Date Issued: 2018
Identifier: CFE0007227, ucf:52214
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007227

Title: Biogeochemical Cycling and Nutrient Control Strategies for Groundwater at Stormwater Infiltration Basins.
Creator: O'Reilly, Andrew, Chang, Ni-bin, Wanielista, Martin, Chopra, Manoj, Wang, Dingbao, Katz, Brian, University of Central Florida
Abstract / Description: Elevated concentrations of nutrients, particularly nitrate, in groundwater and springs in Florida are a growing resource management concern. Stormwater infiltration basins, which are a common stormwater management practice in the well-drained karst terrain areas of Florida, are a potentially important source of nutrients to the groundwater system because stormwater exits the basin by only evaporation or infiltration. To better understand the biogeochemical processes integrating stormwater...
Show moreElevated concentrations of nutrients, particularly nitrate, in groundwater and springs in Florida are a growing resource management concern. Stormwater infiltration basins, which are a common stormwater management practice in the well-drained karst terrain areas of Florida, are a potentially important source of nutrients to the groundwater system because stormwater exits the basin by only evaporation or infiltration. To better understand the biogeochemical processes integrating stormwater infiltration impacts on groundwater resources in a field-scale setting, a combination of hydrologic, soil chemistry, water chemistry, dissolved and soil gas, isotope, and microbiological data was collected from 2007 through 2010 at two stormwater infiltration basins receiving runoff from predominantly residential watersheds in north-central Florida. Substantially different biogeochemical processes affecting nitrogen fate and transport were observed beneath the two stormwater infiltration basins. Differences are related to soil textural properties that deeply link hydroclimatic conditions with soil moisture variations in a humid, subtropical climate. During 2008, shallow groundwater beneath the basin with predominantly clayey soils (median 41% silt+clay content) exhibited decreases in dissolved oxygen from 3.8 to 0.1 mg/L and decreases in nitrate-nitrogen from 2.7 mg/L to less than 0.016 mg/L, followed by manganese and iron reduction, sulfate reduction, and methanogenesis. In contrast, beneath the basin with predominantly sandy soils (median 2% silt+clay content), aerobic conditions persisted from 2007 through 2009 (dissolved oxygen of 5.0(-)7.8 mg/L), resulting in nitrate-nitrogen of 1.3(-)3.3 mg/L in shallow groundwater. Soil extractable nitrate-nitrogen was significantly lower and the copper-containing nitrite reductase gene density was significantly higher beneath the clayey basin. Differences in moisture retention capacity between fine- and coarse-textured soils resulted in median volumetric gas-phase contents of 0.04 beneath the clayey basin and 0.19 beneath the sandy basin, inhibiting surface/subsurface oxygen exchange beneath the clayey basin. Subsurface biogeochemical processes at the clayey stormwater infiltration basin were further analyzed to better understand the effects of the highly variable hydrologic conditions common in humid, subtropical climates. Cyclic variations in biogeochemical processes generally coincided with wet and dry hydroclimatic conditions. Oxidizing conditions in the subsurface persisted for about one month or less at the beginning of wet periods with dissolved oxygen and nitrate showing similar temporal patterns. Reducing conditions in the subsurface evolved during prolonged flooding of the basin. At about the same time oxygen and nitrate reduction concluded, manganese, iron, and sulfate reduction began, with the onset of methanogenesis one month later. Reducing conditions persisted up to six months, continuing into subsequent dry periods until the next major oxidizing infiltration event. Evidence of denitrification in shallow groundwater at the site is supported by median nitrate-nitrogen less than 0.016 mg/L, excess nitrogen gas up to 3 mg/L progressively enriched in delta-15N during prolonged basin flooding, and isotopically heavy delta-15N and delta-18O of nitrate (up to 25 and 15 per mil, respectively). Isotopic enrichment of newly infiltrated stormwater suggests denitrification was partially completed within two days. Soil and water chemistry data suggest a biogeochemically active zone exists in the upper 1.4 m of soil, where organic carbon was the likely electron donor supplied by organic matter in soil solids or dissolved in infiltrating stormwater. The cyclic nature of reducing conditions effectively controlled the nitrogen cycle, switching nitrogen fate beneath the basin from nitrate leaching to reduction in the shallow saturated zone. Soil beneath the sandy stormwater infiltration basin was amended using biosorption activated media (BAM) to study the effectiveness of this technology in reducing inputs of nitrogen and phosphorus to groundwater. The functionalized soil amendment BAM consists of a 1.0:1.9:4.1 mixture (by volume) of tire crumb (to increase sorption capacity), silt and clay (to increase soil moisture retention), and sand (to promote sufficient infiltration), which was applied to develop an innovative best management practice (BMP) utilizing nutrient reduction and flood control sub-basins. Construction and materials costs, excluding profit and permit fees, for the innovative BMP were about $US 65 per square meter of basin bottom. Comparison of nitrate/chloride ratios for the shallow groundwater indicate that prior to using BAM, nitrate concentrations were substantially influenced by nitrification or variations in nitrate input. In contrast, for the new basin utilizing BAM, nitrate/chloride ratios indicate minor nitrification and nitrate losses with the exception of one summer sample that indicated a 45% loss. Biogeochemical indicators (denitrifier activity derived from real-time polymerase chain reaction and variations in major ions, nutrients, dissolved and soil gases, and stable isotopes) suggest nitrate losses are primarily attributable to denitrification, whereas dissimilatory nitrate reduction to ammonium and plant uptake are minor processes. Denitrification was likely occurring intermittently in anoxic microsites in the unsaturated zone, which was enhanced by increased soil moisture within the BAM layer and resultant reductions in surface/subsurface oxygen exchange that produced conditions conducive to increased denitrifier activity. Concentrations of total dissolved phosphorus and orthophosphate were reduced by more than 70% in unsaturated zone soil water, with the largest decreases in the BAM layer where sorption was the most likely mechanism for removal. Post-BAM orthophosphate/chloride ratios for shallow groundwater indicate predominantly minor increases and decreases in orthophosphate with the exception of one summer sample that indicated a 50% loss. Differences in nutrient variations between the unsaturated zone and shallow groundwater may be the result of the intensity and duration of nutrient removal processes and mixing ratios with water that had undergone little biogeochemical transformation. In order to quantify potential processes leading to observed nitrogen losses beneath the innovative BMP, an integrated infiltration basin(-)nitrogen reduction (IBNR) system dynamics model was developed. Based on two simulation periods, the IBNR model indicated denitrification accounted for a loss of about one-third of the total dissolved nitrogen mass inflow and was occurring predominantly in the BAM layer. The IBNR model results in combination with the field-based biogeochemical assessment demonstrated that the innovative BMP using the functionalized soil amendment BAM is a promising passive, economical, stormwater nutrient-treatment technology. Further field- and laboratory-scale research on the long-term sustainability of nutrient losses and further elucidation of causative physicochemical and biogeochemical mechanisms would contribute to improved BAM performance and green infrastructure development in the future.
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Date Issued: 2012
Identifier: CFE0004419, ucf:49391
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004419

Title: A CONTENT ANALYSIS OF ELITE U.S. NEWSPAPERSÃ‚Â' COVERAGE OF IRAN, 1979 AND 2005.
Creator: Kamal, Melissa, Akita, Kimiko, University of Central Florida
Abstract / Description: This study is a quantitative content analysis of the New York Times and Washington Post coverage of Iran during the period surrounding the Ayatollah KhomeiniÃ‚Â's ascension to power in 1979 as well as the period surrounding Mahmoud AhmadinejadÃ‚Â's election in 2005. The results showed that coverage of Iran in the elite American print media as it related to terror was higher in the period after Khomeini came to power and also in the period after...
Show moreThis study is a quantitative content analysis of the New York Times and Washington Post coverage of Iran during the period surrounding the Ayatollah KhomeiniÃ‚Â's ascension to power in 1979 as well as the period surrounding Mahmoud AhmadinejadÃ‚Â's election in 2005. The results showed that coverage of Iran in the elite American print media as it related to terror was higher in the period after Khomeini came to power and also in the period after AhmadinejadÃ‚Â's election than it was in the period immediately preceding their respective ascensions. The results also showed that there was more coverage of Iran as it related to terror in the year surrounding AhmadinejadÃ‚Â's election than there was during the year surrounding Ayatollah KhomeiniÃ‚Â's rise to power in Iran.
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Date Issued: 2010
Identifier: CFE0003077, ucf:48331
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003077

Title: Comparison of a modified and traditional rapid infiltration basin for treatment and control of nutrients in wastewater effluent.
Creator: Cormier, Jessica, Duranceau, Steven, Wang, Dingbao, Sadmani, A H M Anwar, University of Central Florida
Abstract / Description: Rapid infiltration basins (RIB) have been historically used in Florida for groundwater recharge, effluent disposal, or a combination of both. However, this technique has proven ineffective in providing nitrogen control unless the RIB is modified in some manner. In this study, a traditional RIB was compared to a modified RIB constructed with manufactured biosorption activated media (BAM) to evaluate nitrate removal from reclaimed water. The RIBs are used for reclaimed and excess storm water...
Show moreRapid infiltration basins (RIB) have been historically used in Florida for groundwater recharge, effluent disposal, or a combination of both. However, this technique has proven ineffective in providing nitrogen control unless the RIB is modified in some manner. In this study, a traditional RIB was compared to a modified RIB constructed with manufactured biosorption activated media (BAM) to evaluate nitrate removal from reclaimed water. The RIBs are used for reclaimed and excess storm water disposal. Few, if any, studies have been published where BAM-modified RIBs have been used for this purpose. In this work, a mixture of clay, tire crumb, and sand (CTS) was selected to serve as the BAM material (Bold and Gold(TM) CTS media). Each RIB was constructed with two feet of either sand or BAM, covering more than 43,600 square feet of surface area. The BAM-modified RIB had an initial 90 pounds per cubic-foot in-place density, and the density of the control RIB approximated about 94 pounds per cubic-foot. Over an eight-month period, loadings to the BAM RIB and control RIB approximated 5.4 million gallons (MG) per acre each. Water samples, collected from lysimeters installed below the 2-foot of sand or BAM materials, were gathered monthly during 2017 (except for September and October due to the impacts of hurricane Irma); these samples were analyzed for water quality to determine nitrate removal. Soil moisture and weather data were also collected over the study period. This study demonstrated the nitrate removal effectiveness of a field-scale BAM-modified RIB as compared to a traditional field-scale sand-based RIB. Results suggest that BAM removed 30 percent more nitrates than the Control (78% and 47%, respectively) under the conditions of the study. Furthermore, BAM removed higher percentages of TN (31%) and TP (62%) than the Control (12% and 28%, respectively).
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Date Issued: 2018
Identifier: CFE0007566, ucf:52583
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007566

Title: Nam June Paik and Avant-Garde as Pedagogy: Promoting Student Engagement and Interdisciplinary Thinking in the Undergraduate Humanities Classroom.
Creator: Mazzarotto, Marcia, Mauer, Barry, Applen, John, Rounsaville, Angela, Taylor, Robert, University of Central Florida
Abstract / Description: This dissertation demonstrates how avant-garde methods can be employed as pedagogical methods in the undergraduate Humanities classroom to promote student engagement and interdisciplinary thinking. The study first addresses pedagogy and avant-garde art within their historical contexts as separate, but related disciplines. Subsequently the study fuses pedagogy and avant-garde art and provides examples of in-class activities and out-of-class assignments that illustrate the ways in which avant...
Show moreThis dissertation demonstrates how avant-garde methods can be employed as pedagogical methods in the undergraduate Humanities classroom to promote student engagement and interdisciplinary thinking. The study first addresses pedagogy and avant-garde art within their historical contexts as separate, but related disciplines. Subsequently the study fuses pedagogy and avant-garde art and provides examples of in-class activities and out-of-class assignments that illustrate the ways in which avant-garde methods function as practical teaching and learning methods. Further, the study presents artist Nam June Paik, whose work exemplifies the theoretical and practical underpinnings of avant-garde art as pedagogy. The dissertation champions the pedagogy of John Dewey, who called for a progressive educational system. It also argues for Paulo Freire's critical pedagogy and the Jesuits' Ignatian pedagogical paradigm, both of which serve as necessary complements in achieving Dewey's goal of an experiential educational environment. Dewey believed education should co-exist with life and should not be treated as a preparation for it, and thus his theories on aesthetics, in particular, argued that art is not severed from life, an idea shared by four avant-garde movements discussed in this study: Futurism, Dada, Surrealism, and Fluxus. Each of these movements sought to change the political and cultural environment, while maintaining that art and life are on equal ground. These pedagogies, aided by avant-garde methods, encourage and challenge students to engage with and think critically about the world around them.
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Date Issued: 2017
Identifier: CFE0006623, ucf:51282
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006623

Title: A Snapchat Marketing Perspective: Examining the Personality Traits and Motives that Predict Attitudes Toward and Engagement with Non-Sponsored and Sponsored Content in Snapchat.
Creator: Sousa Garnica, Tiany, Kinnally, William, Rubenking, Bridget, Sellnow, Deanna, University of Central Florida
Abstract / Description: Social networking sites (SNS) have revolutionized the communication between consumers and brands, publishers, and marketers. These platforms have become a way for advertisers to communicate directly and engage users with content that is innovative and less intrusive. The aim of this research is to examine the personality traits and motives (based on the uses and gratifications theory) that predict attitudes toward and engagement with non-sponsored and sponsored content in Snapchat. An online...
Show moreSocial networking sites (SNS) have revolutionized the communication between consumers and brands, publishers, and marketers. These platforms have become a way for advertisers to communicate directly and engage users with content that is innovative and less intrusive. The aim of this research is to examine the personality traits and motives (based on the uses and gratifications theory) that predict attitudes toward and engagement with non-sponsored and sponsored content in Snapchat. An online survey with 606 participants showed that the main motives of using Snapchat were social information seeking, entertainment, and impression management. Multiple regression analyses were used to determine what personality traits predict the motives for using Snapchat. Finally, hierarchical multiple regressions were used to examine the models that predict attitudes toward the non-sponsored and sponsored features in Snapchat as well as the engagement with them. Recommendations for practitioners were given to help them develop marketing strategies in Snapchat.
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Date Issued: 2017
Identifier: CFE0006799, ucf:51825
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006799

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