Current Search: construct (x)
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Title
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An Agile Roadmap for Live, Virtual and Constructive-Integrating Training Architecture (LVC-ITA): A Case Study Using a Component based Integrated Simulation Engine.
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Creator
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Park, Tae Woong, Lee, Gene, Rabelo, Luis, Elshennawy, Ahmad, Kincaid, John, University of Central Florida
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Abstract / Description
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Conducting seamless Live Virtual Constructive (LVC) simulation remains the most challenging issue of Modeling and Simulation (M(&)S). There is a lack of interoperability, limited reuse and loose integration between the Live, Virtual and/or Constructive assets across multiple Standard Simulation Architectures (SSAs). There have been various theoretical research endeavors about solving these problems but their solutions resulted in complex and inflexible integration, long user-usage time and...
Show moreConducting seamless Live Virtual Constructive (LVC) simulation remains the most challenging issue of Modeling and Simulation (M(&)S). There is a lack of interoperability, limited reuse and loose integration between the Live, Virtual and/or Constructive assets across multiple Standard Simulation Architectures (SSAs). There have been various theoretical research endeavors about solving these problems but their solutions resulted in complex and inflexible integration, long user-usage time and high cost for LVC simulation. The goal of this research is to provide an Agile Roadmap for the Live Virtual Constructive-Integrating Training Architecture (LVC-ITA) that will address the above problems and introduce interoperable LVC simulation. Therefore, this research describes how the newest M(&)S technologies can be utilized for LVC simulation interoperability and integration. Then, we will examine the optimal procedure to develop an agile roadmap for the LVC-ITA.In addition, this research illustrated a case study using an Adaptive distributed parallel Simulation environment for Interoperable and reusable Model (AddSIM) that is a component based integrated simulation engine. The agile roadmap of the LVC-ITA that reflects the lessons learned from the case study will contribute to guide M(&)S communities to an efficient path to increase interaction of M(&)S simulation across systems.
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Date Issued
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2015
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Identifier
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CFE0005682, ucf:52867
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0005682
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Title
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A CONSTRUCTIONIST ANALYSIS OF SAME-SEX MARRIAGE.
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Creator
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Nead, Sandra, Lynxwiler, John, University of Central Florida
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Abstract / Description
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Same-sex marriage has been heavily debated in academics and in the public sphere. During the 2004 Presidential election same-sex marriage became an issue that polarized the candidates. It has become a lightning rod for public debate. Due to the increasing attention to the controversy of legalizing same-sex marriage, it is an important topic for research. This paper seeks to contribute to the research of same-sex marriage by providing insight into claims-making efforts to define same-sex...
Show moreSame-sex marriage has been heavily debated in academics and in the public sphere. During the 2004 Presidential election same-sex marriage became an issue that polarized the candidates. It has become a lightning rod for public debate. Due to the increasing attention to the controversy of legalizing same-sex marriage, it is an important topic for research. This paper seeks to contribute to the research of same-sex marriage by providing insight into claims-making efforts to define same-sex marriage as a social problem. My findings shed light on this topic from a social constructionist perspective by examining the use of rhetorical idioms of the claims made by opposing parties in the debate over same-sex marriage as it relates to the court ruling in Goodridge v. Department of Public Health.
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Date Issued
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2005
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Identifier
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CFE0000662, ucf:46552
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0000662
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Title
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Quality Indicators for Classrooms Serving Students with Autism Spectrum Disorder: A Construct Validation Study.
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Creator
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Hopkins, Rebecca, Vasquez, Eleazar, Marino, Matthew, Dieker, Lisa, Rosenberg, Michael, University of Central Florida
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Abstract / Description
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A rise in the prevalence of students with ASD points to the need for more qualified and effective teachers to meet the needs of this population. Existing research delineates evidence-based practices and teaching standards positively improve educational outcomes for students with ASD. Teacher evaluation systems have the potential to highlight strengths and areas for improvement in special education teaching practices. Research on observation instruments to evaluate the unique skills and...
Show moreA rise in the prevalence of students with ASD points to the need for more qualified and effective teachers to meet the needs of this population. Existing research delineates evidence-based practices and teaching standards positively improve educational outcomes for students with ASD. Teacher evaluation systems have the potential to highlight strengths and areas for improvement in special education teaching practices. Research on observation instruments to evaluate the unique skills and knowledge of special education teachers of students with ASD is limited. A need exists for high quality observation instruments to measure teacher performance in special education classrooms serving students with ASD. The purpose of this study was to examine the internal consistency reliability and the construct validity of the Quality Indicators for Classrooms Serving Students with Autism Spectrum Disorder (QIASD) scores. The researcher used a confirmatory factor analysis framework to determine if the QIASD quality indicators load onto the seven factors as hypothesized in the measurement model. The researcher found promising results but was not able to identify an acceptable model with this sample.
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Date Issued
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2018
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Identifier
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CFE0007193, ucf:52246
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0007193
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Title
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Ultra-High Performance Concrete for Precast Seismic Bridge Column Connection.
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Creator
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Chan, Titchenda, Mackie, Kevin, Catbas, Necati, Chopra, Manoj, Bai, Yuanli, University of Central Florida
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Abstract / Description
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Accelerated bridge construction (ABC) utilizes prefabricated bridge elements constructed off-site, delivered, and assembled on-site to expedite construction time and reduce traffic disruption. ABC has been increasingly used for super- and sub-structure elements in low seismic regions. However, its application in medium and high seismic regions remain limited, particularly for precast columns where connections typically coincide with plastic hinge (PH) regions. Ultra-high performance concrete ...
Show moreAccelerated bridge construction (ABC) utilizes prefabricated bridge elements constructed off-site, delivered, and assembled on-site to expedite construction time and reduce traffic disruption. ABC has been increasingly used for super- and sub-structure elements in low seismic regions. However, its application in medium and high seismic regions remain limited, particularly for precast columns where connections typically coincide with plastic hinge (PH) regions. Ultra-high performance concrete (UHPC), characterized by high compressive and tensile strength, and superior bond properties, is a potential material that can mitigate PH damage and enhance load transfer. This research proposes a new and simple damage tolerant precast column connection for use in medium and high seismic regions. The connection laps the column longitudinal reinforcement with footing dowels using a short splice length, a practical concrete cover, no shear reinforcement, and the shifted PH concept to prevent footing damage. Two 0.42-scale precast columns with different shear span ratios were tested under reversed cyclic loading to investigate the proposed connection relative to previously tested cast-in-place specimens. Results showed the connection performed well in shear, developed column longitudinal bars, shifted PH formation above the UHPC connection, and exhibited high lateral capacity and ductility. Twenty-seven pullout and lap splice beams were tested to study the bond of reinforcement in UHPC under different parameters and stress states. Results indicated significant bond strength improvement and splice length reduction compared with conventional concrete. The pullout specimens were simulated using the OpenSees framework to propose reinforcing steel in UHPC bond-slip models where existing studies in the literature were limited. The models were incorporated into the numerical modeling of the precast columns using one-dimensional fiber-section and two-dimensional plane stress nonlinear analyses. Results from the two modeling methods showed good agreement with the experiments, with the calibrated bond-slip models providing a good representation of load transfer in the connection.
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Date Issued
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2019
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Identifier
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CFE0007610, ucf:52534
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0007610
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Title
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Monitoring and Modeling to Estimate Hydrogen Sulfide Emissions and Dispersion from Florida Construction and Demolition Landfills to Construct Odor Buffering Distances.
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Creator
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Bolyard, Steven, Cooper, Charles, Mackie, Kevin, Randall, Andrew, Zhang, Husen, University of Central Florida
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Abstract / Description
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Emissions of hydrogen sulfide (H2S) from construction and demolition (C & D) landfills can result in odors that are a significant nuisance to nearby neighborhoods and businesses. As Florida's population continues to grow and create development pressures, housing is built closer to existing landfills. Additionally, new landfills will be created in the future. This research project was undertaken to develop a detailed modeling methodology for use by counties and other landfill owners to provide...
Show moreEmissions of hydrogen sulfide (H2S) from construction and demolition (C & D) landfills can result in odors that are a significant nuisance to nearby neighborhoods and businesses. As Florida's population continues to grow and create development pressures, housing is built closer to existing landfills. Additionally, new landfills will be created in the future. This research project was undertaken to develop a detailed modeling methodology for use by counties and other landfill owners to provide them with an objective and scientifically defensible means to establish odor buffer zones around C & D landfills. A technique for estimating methane (and odorous gas) emissions from municipal solid waste (MSW) landfills was recently developed by researchers at the University of Central Florida. This technique was based on measuring hundreds of ambient methane concentrations near the surface of the landfill, and combining that data with matrix inversion mathematics to back-solve the dispersion equations. The technique was fully documented in two peer-reviewed journal articles. This project extends that methodology. In this work the author measured ambient H2S concentrations at various locations in a C & D landfill, and applied those same matrix inversion techniques to determine the H2S emission rates from the landfill. The emission rates were then input into the AERMOD dispersion model to determine H2S odor buffer distances around the landfill.Three sampling trips to one C & D landfill were undertaken, data were taken, and the modeling techniques were applied. One problem encountered was that H2S emissions from C & D landfills are typically about 1000 times smaller than methane emissions (from MSW landfills). Thus, H2S ambient concentrations often are near the detection limits of the instruments, and the data may not be as reliable. However, this approach could be used for any particular C & D landfill if the appropriate amount of data were available to characterize its emissions with some certainty. The graphical tool developed in this work shows isopleths of (")H2S(") concentrations at various distances, and color codes the isopleths into a (")green-yellow-red(") scheme (analogous to a traffic signal) that depicts zones where private landowners likely will not detect odors, where they may experience some odors, or where they likely will experience odors. The (")likelihood(") can be quantified by selecting the Nth highest hourly concentrations in one year to form the plot. In this study, N was conservatively selected as 8. Requiring that concentrations be at or below the 8th highest concentration in a year corresponds to a 99.9% probability of not exceeding that concentration at that distance in any future year. The graphical tool can be applied to any C & D landfill but each landfill is different. So this technique depends on having a fairly good estimate of the rate of emissions of H2S from the landfill in question, and at least one year's worth of hourly meteorological data (wind speed, direction, and stability class) that is representative of the landfill location. The meteorological data can be obtained with relative ease for most locations in Florida; however, the emission data must be obtained from on-site measurements for any given landfill.
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Date Issued
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2012
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Identifier
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CFE0004272, ucf:52879
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0004272
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Title
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Assessment Center Structure and Construct Validity: A New Hope.
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Creator
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Wiese, Christopher, Jentsch, Kimberly, Salas, Eduardo, Jentsch, Florian, Burke, Shawn, University of Central Florida
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Abstract / Description
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Assessment Centers (ACs) are a fantastic method to measure behavioral indicators of job performance in multiple diverse scenarios. Based upon a thorough job analysis, ACs have traditionally demonstrated very strong content and criterion-related validity. However, researchers have been puzzled for over three decades with the lack of evidence concerning construct validity. ACs are designed to measure critical job dimensions throughout multiple situational exercises. However, research has...
Show moreAssessment Centers (ACs) are a fantastic method to measure behavioral indicators of job performance in multiple diverse scenarios. Based upon a thorough job analysis, ACs have traditionally demonstrated very strong content and criterion-related validity. However, researchers have been puzzled for over three decades with the lack of evidence concerning construct validity. ACs are designed to measure critical job dimensions throughout multiple situational exercises. However, research has consistently revealed that different behavioral ratings within these scenarios are more strongly related to one another (exercise effects) than the same dimension rating across scenarios (dimension effects). That is, results from ACs suggest that we are unsure of what these behavioral measures represent. Over the last three decades, researchers have sought to illuminate why same dimension ratings are inconsistent across scenarios. However, these investigations have been limited to changes influencing the source of the ratings (e.g., assessors, trained raters). No approach has been taken to change the structure of the AC. This study breaks with tradition and introduces a structurally different AC: A Day-In-The Life AC (DITLAC). A DITLAC structure is designed to mimic that of a normal day on the job. In the present study, the construct validity between a DITLAC and a traditionally structured AC is compared with the argument that the DITLAC will demonstrate stronger construct validity evidence. In several cases, this was found to be true.
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Date Issued
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2015
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Identifier
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CFE0005905, ucf:50878
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0005905
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Title
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Positive Political Outcomes From Feminist Islam in Afghanistan: Identifying Development Program Features that Raise the Status of Women.
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Creator
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Barnard, Margaret, Hamann, Kerstin, Owens, J. Thomas, Dolan, Thomas, Kinsey, Barbara, University of Central Florida
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Abstract / Description
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Existing literature establishes a connection between elevating the status of women in less developed countries and positive political outcomes including: increased national stability, decreased likelihood of civil conflict, and international stability. In particular, the literature suggests that working within the dominant cultural framework of a country makes development projects more successful. This thesis expands upon these bodies of literature and examines the outcomes of the work of two...
Show moreExisting literature establishes a connection between elevating the status of women in less developed countries and positive political outcomes including: increased national stability, decreased likelihood of civil conflict, and international stability. In particular, the literature suggests that working within the dominant cultural framework of a country makes development projects more successful. This thesis expands upon these bodies of literature and examines the outcomes of the work of two major development agencies in Afghanistan, the UN and USAID in the area of women's education and healthcare. The thesis analyzes some specific characteristics that influence the effects of these programs in the Afghan context. It argues that when development agencies work within the unique cultural context of Afghanistan, and promote development gains for women within an Islamic framework, they are more likely to be effective than if they do not work within this framework. The thesis tests this hypothesis with a comparative qualitative analysis of the goals and accomplishes of the UN and USAID and compares the results of the analysis with survey data from The Asia Foundation Survey of the Afghan people, which provides data from 2006-2013 regarding attitudes of the Afghan people. Based on a qualitative analysis, the study's results, although tentative, identifies patterns of success using the Islamic framework.
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Date Issued
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2014
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Identifier
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CFE0005460, ucf:50368
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0005460
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Title
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Captain John Smith and American Identity: Evolutions of Constructed Narratives and Myths in the 20th and 21st Centuries.
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Creator
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Corbett, Joseph, Murphree, Daniel, Sacher, John, Larson, Peter, University of Central Florida
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Abstract / Description
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Historical narratives and anecdotes concerning Captain John Smith have been told and retold throughout the entire history the United States of America, and they have proved to be sacred, influential, and contested elements in the construction of the individual, sectional, regional, and national identity of many. In this thesis, I first outline some of the history of how narratives and discourses surrounding Captain John Smith were directly connected with the identity of many Americans during...
Show moreHistorical narratives and anecdotes concerning Captain John Smith have been told and retold throughout the entire history the United States of America, and they have proved to be sacred, influential, and contested elements in the construction of the individual, sectional, regional, and national identity of many. In this thesis, I first outline some of the history of how narratives and discourses surrounding Captain John Smith were directly connected with the identity of many Americans during the 18th and 19th century, especially Virginians and Southerners. Then I outline how these narratives and discourses from the 18th and 19th centuries have continued and evolved in the 20th and 21st centuries in American scholarship and popular culture. I demonstrate how Captain John Smith went from being used as a symbol for regional and sectional identity to a symbol for broader national American identity, and how he has anachronistically come to be considered an American. I then show how Captain John Smith has continued to be constructed, to a seemingly larger degree than previous centuries, as a hero of almost mythic proportions. Finally I demonstrate how this constructed American hero is used as a posterchild for various interest groups and ideologies in order to legitimize the places of certain discourses and behavior within constructed and contested American identities.
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Date Issued
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2013
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Identifier
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CFE0004666, ucf:49892
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0004666
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Title
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Data-Driven Simulation Modeling of Construction and Infrastructure Operations Using Process Knowledge Discovery.
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Creator
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Akhavian, Reza, Behzadan, Amir, Oloufa, Amr, Yun, Hae-Bum, Sukthankar, Gita, Zheng, Qipeng, University of Central Florida
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Abstract / Description
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Within the architecture, engineering, and construction (AEC) domain, simulation modeling is mainly used to facilitate decision-making by enabling the assessment of different operational plans and resource arrangements, that are otherwise difficult (if not impossible), expensive, or time consuming to be evaluated in real world settings. The accuracy of such models directly affects their reliability to serve as a basis for important decisions such as project completion time estimation and...
Show moreWithin the architecture, engineering, and construction (AEC) domain, simulation modeling is mainly used to facilitate decision-making by enabling the assessment of different operational plans and resource arrangements, that are otherwise difficult (if not impossible), expensive, or time consuming to be evaluated in real world settings. The accuracy of such models directly affects their reliability to serve as a basis for important decisions such as project completion time estimation and resource allocation. Compared to other industries, this is particularly important in construction and infrastructure projects due to the high resource costs and the societal impacts of these projects. Discrete event simulation (DES) is a decision making tool that can benefit the process of design, control, and management of construction operations. Despite recent advancements, most DES models used in construction are created during the early planning and design stage when the lack of factual information from the project prohibits the use of realistic data in simulation modeling. The resulting models, therefore, are often built using rigid (subjective) assumptions and design parameters (e.g. precedence logic, activity durations). In all such cases and in the absence of an inclusive methodology to incorporate real field data as the project evolves, modelers rely on information from previous projects (a.k.a. secondary data), expert judgments, and subjective assumptions to generate simulations to predict future performance. These and similar shortcomings have to a large extent limited the use of traditional DES tools to preliminary studies and long-term planning of construction projects.In the realm of the business process management, process mining as a relatively new research domain seeks to automatically discover a process model by observing activity records and extracting information about processes. The research presented in this Ph.D. Dissertation was in part inspired by the prospect of construction process mining using sensory data collected from field agents. This enabled the extraction of operational knowledge necessary to generate and maintain the fidelity of simulation models. A preliminary study was conducted to demonstrate the feasibility and applicability of data-driven knowledge-based simulation modeling with focus on data collection using wireless sensor network (WSN) and rule-based taxonomy of activities. The resulting knowledge-based simulation models performed very well in properly predicting key performance measures of real construction systems. Next, a pervasive mobile data collection and mining technique was adopted and an activity recognition framework for construction equipment and worker tasks was developed. Data was collected using smartphone accelerometers and gyroscopes from construction entities to generate significant statistical time- and frequency-domain features. The extracted features served as the input of different types of machine learning algorithms that were applied to various construction activities. The trained predictive algorithms were then used to extract activity durations and calculate probability distributions to be fused into corresponding DES models. Results indicated that the generated data-driven knowledge-based simulation models outperform static models created based upon engineering assumptions and estimations with regard to compatibility of performance measure outputs to reality.
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Date Issued
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2015
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Identifier
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CFE0006023, ucf:51014
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0006023
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Title
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The Ontological Sociology of Cryptocurrency: A Theoretical Exploration of Bitcoin.
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Creator
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Villarreal, Omar, Gay, David, Hinojosa, Ramon, Corzine, Harold, University of Central Florida
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Abstract / Description
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For millennia, money has been a basal element of everyday life reality in market-organized societies. Albeit money has changed extrinsically (e.g., form, use, utility) countless of times, some intrinsic characteristics remain the same, i.e., money is reified value. But why? What gives money value? Even more crucial, what is money in the first place? This exploratory study delves into the intricacies of money, in particular the revolutionary 21st century pecuniary techno-phenomenon, a...
Show moreFor millennia, money has been a basal element of everyday life reality in market-organized societies. Albeit money has changed extrinsically (e.g., form, use, utility) countless of times, some intrinsic characteristics remain the same, i.e., money is reified value. But why? What gives money value? Even more crucial, what is money in the first place? This exploratory study delves into the intricacies of money, in particular the revolutionary 21st century pecuniary techno-phenomenon, a cryptocurrency called Bitcoin. Though cryptocurrencies have been the topic of several financial and legal scholarly publications for a few years, we rather focus our analysis on Bitcoin's ontological characteristics under a schema of overlapping theoretical layers: Social Exchange Theory, Marxian Dialectics, and Social Construction of Reality. Our intention is to dissect Bitcoin sociologically and empirically examine its global exchange, consumption, and institutionalization. Consequently, we venture to ask, can Bitcoin redefine the meaning of money and how we relate to it? Reformulate the role of banking? Disrupt the universally accepted objective reality of currency value attached to sensorial experience? Transfer trust from ambivalent human relations to an incorruptible algorithm? Or even become (")the Internet of money(")?
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Date Issued
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2016
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Identifier
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CFE0006412, ucf:51468
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0006412
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Title
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A Methodology on Weapon Combat Effectiveness Analytics using Big Data and Live, Virtual, or/and Constructive Simulations.
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Creator
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Jung, Won Il, Lee, Gene, Rabelo, Luis, Elshennawy, Ahmad, Ahmad, Ali, University of Central Florida
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Abstract / Description
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The Weapon Combat Effectiveness (WCE) analytics is very expensive, time-consuming, and dangerous in the real world because we have to create data from the real operations with a lot of people and weapons in the actual environment. The Modeling and Simulation (M(&)S) of many techniques is used for overcoming these limitations. Although the era of big data has emerged and achieved a great deal of success in a variety of fields, most WCE research using the Defense Modeling and Simulation (DM(&)S...
Show moreThe Weapon Combat Effectiveness (WCE) analytics is very expensive, time-consuming, and dangerous in the real world because we have to create data from the real operations with a lot of people and weapons in the actual environment. The Modeling and Simulation (M(&)S) of many techniques is used for overcoming these limitations. Although the era of big data has emerged and achieved a great deal of success in a variety of fields, most WCE research using the Defense Modeling and Simulation (DM(&)S) techniques were studied without the help of big data technologies and techniques. The existing research has not considered various factors affecting WCE. This is because current research has been restricted by only using constructive simulation, a single weapon system, and limited scenarios. Therefore, the WCE analytics using existing methodologies have also incorporated the same limitations, and therefore, cannot help but get biased results.To solve the above problem, this dissertation is to initially review and compose the basic knowledge for the new WCE analytics methodology using big data and DM(&)S to further serve as the stepping-stone of the future research for the interested researchers. Also, this dissertation presents the new methodology on WCE analytics using big data generated by Live, Virtual, or/and Constructive (LVC) simulations. This methodology can increase the fidelity of WCE analytics results by considering various factors. It can give opportunities for application of weapon acquisition, operations analytics and plan, and objective level development on each training factor for the weapon operators according to the selection of Measures of Effectiveness (MOEs) and Measures of Performance (MOPs), or impact factors, based on the analytics goal.
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Date Issued
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2018
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Identifier
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CFE0007025, ucf:52870
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0007025
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Title
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Lattice-Valued T-Filters and Induced Structures.
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Creator
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Reid, Frederick, Richardson, Gary, Brennan, Joseph, Han, Deguang, Lang, Sheau-Dong, University of Central Florida
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Abstract / Description
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A complete lattice is called a frame provided meets distribute over arbitrary joins. The implication operation in this context plays a central role. Intuitively, it measures the degree to which one element is less than or equal to another. In this setting, a category is defined by equipping each set with a T-convergence structure which is defined in terms of T-filters. This category is shown to be topological, strongly Cartesian closed, and extensional. It is well known that the category of...
Show moreA complete lattice is called a frame provided meets distribute over arbitrary joins. The implication operation in this context plays a central role. Intuitively, it measures the degree to which one element is less than or equal to another. In this setting, a category is defined by equipping each set with a T-convergence structure which is defined in terms of T-filters. This category is shown to be topological, strongly Cartesian closed, and extensional. It is well known that the category of topological spaces and continuous maps is neither Cartesian closed nor extensional.Subcategories of compact and of complete spaces are investigated. It is shown that each T-convergence space has a compactification with the extension property provided the frame is a Boolean algebra. T-Cauchy spaces are defined and sufficient conditions for the existence of a completion are given. T-uniform limit spaces are also defined and their completions are given in terms of the T-Cauchy spaces they induce. Categorical properties of these subcategories are also investigated. Further, for a fixed T-convergence space, under suitable conditions, it is shown that there exists an order preserving bijection between the set of all strict, regular, Hausdorff compactifications and the set of all totally bounded T-Cauchy spaces which induce the fixed space.
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Date Issued
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2019
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Identifier
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CFE0007520, ucf:52586
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0007520
Pages