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Title: The Relationship of English Language Scores on International Students' Academic Success.
Creator: Shbeeb, Rebekah, Biraimah, Karen, Cintron Delgado, Rosa, Bai, Haiyan, Wolford, Anna, University of Central Florida
Abstract / Description: International graduate students at the University of Central Florida (UCF) are not completing graduate programs at the same rate as domestic graduate students. One of the main differences in the admissions process for international graduate students compared to domestic students is the English language test requirement. The purpose of this study was twofold: to test if the Test of English as a Foreign Language (TOEFL) or the (International English Language Testing System) IELTS scores have...
Show moreInternational graduate students at the University of Central Florida (UCF) are not completing graduate programs at the same rate as domestic graduate students. One of the main differences in the admissions process for international graduate students compared to domestic students is the English language test requirement. The purpose of this study was twofold: to test if the Test of English as a Foreign Language (TOEFL) or the (International English Language Testing System) IELTS scores have any statistically significant linear relationships to international graduate students' academic success as defined by their cumulative grade point average (CGPA). Secondly, this study sought to understand how international graduate students feel about the TOEFL and/or IELTS, and whether or not they feel prepared for study with regards to their English language ability. Using mixed-methods research, data were retrieved from international graduate students who graduated from UCF during the 2012 (-) 2016 academic school years. Information from a total of 583 international graduate students was included in the retrieved data collection and data analyses. A survey was also utilized to assess current international graduate students' perceptions of the English language test and requirements. A total of 235 students completed the survey. The study demonstrated that TOEFL and IELTS scores do not have any statistically significant linear relationship to international graduate students' CGPA. Therefore, results from this research study did not indicate that the English language test scores have an impact on academic success for international graduate students who met the UCF admission requirements. The findings also demonstrate that international graduate students generally feel the scores are an accurate assessment of their English language abilities. However, many international graduate students expressed a desire for additional English language resources.The findings are beneficial in able to better understand whether or not English language test scores have any impact on international graduate students' success, and to more accurately comprehend the international graduate students' perspective regarding the language requirement.
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Date Issued: 2019
Identifier: CFE0007725, ucf:52421
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007725

Title: Nitrogen-Containing Materials for Mechanochemical Synthesis, Luminescence Analysis, and Heterogeneous Catalysis.
Creator: Nash, David, Zhai, Lei, Hampton, Michael, Harper, James, Rex, Matthew, Blair, Richard, University of Central Florida
Abstract / Description: Various inorganic nitrogen-containing materials have been exploited for their different properties. Several nitride materials are commercially attractive due to their mechanical properties making them suitable for ceramic industries and wide bandgaps fitting for use as semiconductor and insulator materials, as well as optoelectronics. Nitride materials can exhibit versatility in applications such as the use of gallium nitride to make blue LEDs, nitrides of titanium and silicon being utilized...
Show moreVarious inorganic nitrogen-containing materials have been exploited for their different properties. Several nitride materials are commercially attractive due to their mechanical properties making them suitable for ceramic industries and wide bandgaps fitting for use as semiconductor and insulator materials, as well as optoelectronics. Nitride materials can exhibit versatility in applications such as the use of gallium nitride to make blue LEDs, nitrides of titanium and silicon being utilized as medical implants for their chemical inertness and hardness, and the heavy use of boron nitride as a solid lubricant in the cosmetic industry. Amines have been used as nitrogen-containing organic ligands in organometallic complexes that exhibit phenomenal photophysical properties. These complexes have been heavily studied for potential applications in optoelectronics and chemical sensing. This dissertation will focus on two nitrogen-containing materials that have yet to be explored for the potential applications to be discussed. The first is hexagonal-boron nitride (h-BN), which was previously mentioned to have a substantial use in the cosmetic industry, giving products such as lipstick, foundation, and blush their slick feeling. Computational models have shown the possibility of altered electronic properties of defect sites in the h-BN sheets. These defect sites will be explored experimentally to determine any catalytic activity. Specifically, the hydrogenation reaction using defect-laden hexagonal-boron nitride will be investigated. Successful catalysis would add to the short list of non-metal catalyst, and provide an alternative catalyst that costs significantly less than the traditional metal catalysts commonly used in commercial industries. The second of the two nitrogen-containing materials is a class of metal complexes based on organometallic clusters of copper(I) iodide. Copper(I) iodide clusters formed with amine ligands have been studied for around four decades and the photophysics behind their photoluminescent properties are well understood. Much of the work has been done for use as a potential emissive material in the optoelectronics field. They have also been studied for applications in the sensing of environmental compounds. Here, research will display its use as a novel sensor for narcotic substances. This forensic application will be further explored to develop and eventually commercialize a complete field drug testing system for law enforcement and crime lab use, with the goal to equip law enforcement personnel with a presumptive drug testing method that is accurate, easy-to-use, safe, adaptable, and affordable. This system will consist of a narcotic drug-indicating test strip, a handheld fluorescence spectrometer manufactured in-house using relatively inexpensive parts, and a mobile app that will leverage photoemission data of the tested drug samples collected by multiple crime labs to provide the ability for sample-to-reference data matching. Law enforcement users would have the ability to rapidly identify an unknown substance by applying it to a test strip, testing it using the spectrometer, and capturing an image of the resulting photoemission and analyzing the spectral profile in search of a match with the support of a cloud database.
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Date Issued: 2017
Identifier: CFE0007129, ucf:52297
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007129

Title: Semi-Analytical Solutions of Non-linear Differential Equations Arising in Science and Engineering.
Creator: Dewasurendra, Mangalagama, Vajravelu, Kuppalapalle, Mohapatra, Ram, Rollins, David, Kumar, Ranganathan, University of Central Florida
Abstract / Description: Systems of coupled non-linear differential equations arise in science and engineering are inherently nonlinear and difficult to find exact solutions. However, in the late nineties, Liao introduced Optimal Homotopy Analysis Method (OHAM), and it allows us to construct accurate approximations to the systems of coupled nonlinear differential equations.The drawback of OHAM is, we must first choose the proper auxiliary linear operator and then solve the linear higher-order deformation equation by...
Show moreSystems of coupled non-linear differential equations arise in science and engineering are inherently nonlinear and difficult to find exact solutions. However, in the late nineties, Liao introduced Optimal Homotopy Analysis Method (OHAM), and it allows us to construct accurate approximations to the systems of coupled nonlinear differential equations.The drawback of OHAM is, we must first choose the proper auxiliary linear operator and then solve the linear higher-order deformation equation by spending lots of CPU time. However, in the latest innovation of Liao's " Method of Directly Defining inverse Mapping (MDDiM)" which he introduced to solve a single nonlinear ordinary differential equation has great freedom to define the inverse linear map directly. In this way, one can solve higher order deformation equations quickly, and it is unnecessary to calculate an inverse linear operator.Our primary goal is to extend MDDiM to solve systems of coupled nonlinear ordinary differential equations. In the first chapter, we will introduce MDDiM and briefly discuss the advantages of MDDiM Over OHAM. In the second chapter, we will study a nonlinear coupled system using OHAM. Next three chapters, we will apply MDDiM to coupled non-linear systems arise in mechanical engineering to study fluid flow and heat transfer. In chapter six we will apply this novel method to study coupled non-linear systems in epidemiology to investigate how diseases spread throughout time. In the last chapter, we will discuss our conclusions and will propose some future work. Another main focus is to compare MDDiM with OHAM.
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Date Issued: 2019
Identifier: CFE0007624, ucf:52551
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007624

Title: Viability of a Residential Integrated Stormwater, Graywater, and Wastewater Treatment System.
Creator: Goolsby, Matthew, Chopra, Manoj, Wanielista, Martin, Randall, Andrew, Chang, Ni-bin, University of Central Florida
Abstract / Description: The subject of water scarcity and the rate of water consumption have become popular over the last few decades. Within the topic of water consumption, there are two separate issues from a residential standpoint. The first concern is the steadily increasing need for viable alternative water sources to be utilized for non-potable applications in an effort to reduce potable water demands. The second concern is the need to significantly reduce of nutrient-laden wastewater effluent discharge from...
Show moreThe subject of water scarcity and the rate of water consumption have become popular over the last few decades. Within the topic of water consumption, there are two separate issues from a residential standpoint. The first concern is the steadily increasing need for viable alternative water sources to be utilized for non-potable applications in an effort to reduce potable water demands. The second concern is the need to significantly reduce of nutrient-laden wastewater effluent discharge from septic systems in order to sustain groundwater quality and prevent adverse ecological impacts. This study addresses both issues with two separate systems integrated into one environmentally functional home that emphasizes low impact development (LID) practices. The first objective of the study is to quantify the performance of the passive treatment Bold (&) GoldTM reactive filter bed (FDOH classified (")innovative system(")) for nutrient removal. The second objective is to monitor the water quality of the combined graywater/stormwater cistern for non-potable use and asses all components (green roof, gutters, graywater treatment, AC condensate, well water, stormwater contribution). The performance of the passive innovative system is compared to past studies and regulatory standards. Also, a bench scale model of the OSTDS is constructed at the University of Central Florida (UCF) Stormwater Management Academy Research and Testing Lab (SMART Lab) and tested to provide effluent data at two different residence times. Complex physical, biological, and chemical theories are applied to the analysis of wastewater treatment performance. The data from the OSTDS and stormwater/graywater cistern both systems are also assessed using statistical analysis. The results of the OSTDS are compared to FDOH regulatory requirements for (")Secondary Treatment Standards("), and (")Advanced Secondary Treatment Standards(") with positive results. The bench scale results verify that both biological nutrient removal and physiochemical sorption are occurring within the filter media and quantified the relationship between removal rates and hydraulic residence time (HRT).The combined graywater/stormwater cistern contains acceptable water quality and operates efficiently. The demand on the cistern results in about 50% capacity utilization of the cistern and there is a consistent dependency on the artesian well. The salinity content and high sodium adsorption ratio (SAR) of the cistern water did not produce any noticeable adverse impacts on the home other than scale formation in the toilet. The results of the research determined that the implementation of the integrated system is a viable option at the residential level.
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Date Issued: 2011
Identifier: CFE0004114, ucf:49094
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004114

Title: THE EFFECTS OF PHOSPHATE AND SILICATE INHIBITORS ON SURFACE ROUGHNESS AND COPPER RELEASE IN WATER DISTRIBUTION SYSTEMS.
Creator: MacNevin, David, Taylor, James, University of Central Florida
Abstract / Description: The effects of corrosion inhibitors on water quality and the distribution system were studied. This dissertation investigates the effect of inhibitors on iron surface roughness, copper surface roughness, and copper release. Corrosion inhibitors included blended poly/ortho phosphate, sodium orthophosphate, zinc orthophosphate, and sodium silicate. These inhibitors were added to a blend of surface water, groundwater, and desalinated brackish water. Surface roughness of galvanized iron, unlined...
Show moreThe effects of corrosion inhibitors on water quality and the distribution system were studied. This dissertation investigates the effect of inhibitors on iron surface roughness, copper surface roughness, and copper release. Corrosion inhibitors included blended poly/ortho phosphate, sodium orthophosphate, zinc orthophosphate, and sodium silicate. These inhibitors were added to a blend of surface water, groundwater, and desalinated brackish water. Surface roughness of galvanized iron, unlined cast iron, lined cast iron, and polyvinyl chloride was measured using pipe coupons exposed for three months. Roughness of each pipe coupon was measured with an optical surface profiler before and after exposure to inhibitors. For most materials, inhibitor did not have a significant effect on surface roughness; instead, the most significant factor determining the final surface roughness was the initial surface roughness. Coupons with low initial surface roughness tended to have an increase in surface roughness during exposure, and vice versa, implying that surface roughness tended to regress towards an average or equilibrium value. For unlined cast iron, increased alkalinity and increased temperature tended to correspond with increases in surface roughness. Unlined cast iron coupons receiving phosphate inhibitors were more likely to have a significant change in surface roughness, suggesting that phosphate inhibitors affect stability of iron pipe scales. Similar roughness data collected with new copper coupons showed that elevated orthophosphate, alkalinity, and temperature were all factors associated with increased copper surface roughness. The greatest increases in surface roughness were observed with copper coupons receiving phosphate inhibitors. Smaller increases were observed with copper coupons receiving silicate inhibitor or no inhibitor. With phosphate inhibitors, elevated temperature and alkalinity were associated with larger increases in surface roughness and blue-green copper (II) scales.. Otherwise a compact, dull red copper (I) scale was observed. These data suggest that phosphate inhibitor addition corresponds with changes in surface morphology, and surface composition, including the oxidation state of copper solids. The effects of corrosion inhibitors on copper surface chemistry and cuprosolvency were investigated. Most copper scales had X-ray photoelectron spectroscopy binding energies consistent with a mixture of Cu2O, CuO, Cu(OH)2, and other copper (II) salts. Orthophosphate and silica were detected on copper surfaces exposed to each inhibitor. All phosphate and silicate inhibitors reduced copper release relative to the no inhibitor treatments, keeping total copper below the 1.3 mg/L MCLG for all water quality blends. All three kinds of phosphate inhibitors, when added at 1 mg/L as P, corresponded with a 60% reduction in copper release relative to the no inhibitor control. On average, this percent reduction was consistent across varying water quality conditions in all four phases. Similarly when silicate inhibitor was added at 6 mg/L as SiO2, this corresponded with a 25-40% reduction in copper release relative to the no inhibitor control. Hence, on average, for the given inhibitors and doses, phosphate inhibitors provided more predictable control of copper release across changing water quality conditions. A plot of cupric ion concentration versus orthophosphate concentration showed a decrease in copper release consistent with mechanistic control by either cupric phosphate solubility or a diffusion limiting phosphate film. Thermodynamic models were developed to identify feasible controlling solids. For the no inhibitor treatment, Cu(OH)2 provided the closest prediction of copper release. With phosphate inhibitors both Cu(OH)2 and Cu(PO4)·2H2O models provided plausible predictions. Similarly, with silicate inhibitor, the Cu(OH)2 and CuSiO3·H2O models provided plausible predictions.
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Date Issued: 2008
Identifier: CFE0002001, ucf:47621
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002001

Title: Wireless Power Transfer for Space Applications: System Design and Electromagnetic Compatibility Compliance of Radiated Emissions.
Creator: Vazquez Ramos, Gabriel, Yuan, Jiann-Shiun, Sundaram, Kalpathy, Wu, Xinzhang, Soto Toro, Felix, University of Central Florida
Abstract / Description: This dissertation evaluates the possibility of wireless power transfer (WPT) systems for space applications, with an emphasis in launch vehicles (rockets). After performing literature review for WPT systems, it was identified that magnetic resonance provides the more suited set of characteristics for this application. Advanced analysis, simulation and testing were performed to magnetic resonance WPT systems to acquire system performance insight. This was accomplished by evaluating/varying...
Show moreThis dissertation evaluates the possibility of wireless power transfer (WPT) systems for space applications, with an emphasis in launch vehicles (rockets). After performing literature review for WPT systems, it was identified that magnetic resonance provides the more suited set of characteristics for this application. Advanced analysis, simulation and testing were performed to magnetic resonance WPT systems to acquire system performance insight. This was accomplished by evaluating/varying coupling configuration, load effects and magnetic element physical characteristics (i.e. wire material, loop radius, etc.). It was identified by analysis, circuit simulation and testing that the best coupling configuration for this application was series-series and series-shunt with Litz wire loop inductors. The main concern identified for the implementation of these systems for space applications was radiated emissions that could potentially generate electromagnetic interference (EMI). To address this EMI concern, we developed the Electromagnetic Compatibility Radiated Emissions Compliance Design Evaluation Approach for WPT Space Systems. This approach systematically allocates key analyses, simulations and tests procedures to predict WPT EMC compliance to NASA's EMC standard Mil-Std-461E/F. Three prototype/magnetic elements were successfully assessed by implementing the WPT EMC design approach. The electric fields intensity generated by the WPT prototypes/magnetic elements tested were: 30.02 dBuV/m, 28.90 dBuV/m and 82.13 dBuV/m (requirement limit: 140 dBuV/m). All three prototypes successfully transferred power wirelessly and successfully met the NASA EMC requirements.
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Date Issued: 2012
Identifier: CFE0004448, ucf:49344
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004448

Title: The Impact of Moving From SACS Level I to Level II Status on Faculty Employment in the Florida College System.
Creator: Broeker, Christine, Owens, James, Cintron Delgado, Rosa, Cox, Thomas, Boyd, Tammy, Albritton, Frank, University of Central Florida
Abstract / Description: The State of Florida legislatively authorizes Florida community colleges to confer workforce-oriented bachelor's degrees. As part of the legislation, community colleges are required to achieve Level II (baccalaureate-granting) status through Florida's regional accreditor, the Southern Association of Colleges and Schools-Commission on Colleges (SACS-COC). When moving from SACS Level I to II, former community colleges need to meet the SACS CS 3.7.1 (Qualified Faculty), which requires that...
Show moreThe State of Florida legislatively authorizes Florida community colleges to confer workforce-oriented bachelor's degrees. As part of the legislation, community colleges are required to achieve Level II (baccalaureate-granting) status through Florida's regional accreditor, the Southern Association of Colleges and Schools-Commission on Colleges (SACS-COC). When moving from SACS Level I to II, former community colleges need to meet the SACS CS 3.7.1 (Qualified Faculty), which requires that faculty who teach baccalaureate courses hold the minimum of a master's degree in field. Further complicating matters, as baccalaureate granting institutions, colleges must also comply with CS 3.5.4, requiring 25% of course hours in the baccalaureate degree major to be taught by terminally-degreed faculty. The purpose of this study was to identify what issues related to faculty credentials, if any, have been observed by Florida's community colleges as part of the process to gain SACS-COC Level II status. Results were analyzed through the lens of Travis Hirschi's Social Control Theory. The results of this study indicate that colleges have reported changes in faculty employment after implementing the community college baccalaureate. The most common types of changes included requirements for faculty to complete additional graduate coursework and moving faculty to different programs with different conditions for credentialing. Other types of changes reported included faculty terminations and retirements. The study found strong evidence supporting the notion that finding terminally-degreed faculty is a problem for institutions moving from Level I to Level II status particularly in the fields of nursing and computer science/information technology. The findings indicate that as Florida's community college baccalaureate programs continue to expand, colleges will need to find creative solutions to address SACS CS 3.5.4 requirement of terminal degrees for faculty.?
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Date Issued: 2013
Identifier: CFE0004979, ucf:49597
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004979

Title: DESIGNING AN EXPERIENTIAL WEB-BASED LEARNING MODEL TO DELIVER THE ACQUISITION AND APPLICATION OF KNOWLEDGE TO HOSPITALITY EVENT MANAGEMENT STUDENTS USING ROLE-PLAY SIMULATIONS.
Creator: Hogg, James, Gunter, Glenda, University of Central Florida
Abstract / Description: ABSTRACT Most hospitality institutions have increasingly moved classes online but are concerned about migrating classes and instructional content online. The concern is most Web-based models are designed to deliver the acquisition of knowledge but lack the ability to transform that knowledge into applied career skills for practical use in the industry. The purpose of this study was to test a new Web-based instructional model. The model supported delivering both the acquisition and application...
Show moreABSTRACT Most hospitality institutions have increasingly moved classes online but are concerned about migrating classes and instructional content online. The concern is most Web-based models are designed to deliver the acquisition of knowledge but lack the ability to transform that knowledge into applied career skills for practical use in the industry. The purpose of this study was to test a new Web-based instructional model. The model supported delivering both the acquisition and application of knowledge. Educators, researchers, and practitioners can utilize the new model to enhance the application of career skills and enhance organizational objectives by providing just-in-time training. The new Web-based instructional model can be delivered through multiple platforms including computers, electronic devices, wireless devices and mobile devices. The application of knowledge was delivered through experiential role-play exercises delivered live to the comparison group and virtual, inside Second Life, to the treatment group. An Analysis of Co-Variance (ANCOVA) revealed a significant difference between groups with higher application scores for the students who received the role-play live compared to virtual. In addition, an analysis was conducted to explore factors to consider when examining the cost effectiveness of Web-based instructional content. Factors determined to be important were developmental costs, delivery costs, and reusability of the Web-based instruction.
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Date Issued: 2010
Identifier: CFE0003044, ucf:48341
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003044

Title: DESIGN AND OPERATION OF STATIONARY DISTRIBUTED BATTERY MICRO-STORAGE SYSTEMS.
Creator: Al-Haj Hussein, Ala, Batarseh, Issa, University of Central Florida
Abstract / Description: Due to some technical and environmental constraints, expanding the current electric power generation and transmission system is being challenged by even increasing the deployment of distributed renewable generation and storage systems. Energy storage can be used to store energy from utility during low-demand (off-peak) hours and deliver this energy back to the utility during high-demand (on-peak) hours. Furthermore, energy storage can be used with renewable sources to overcome some of their...
Show moreDue to some technical and environmental constraints, expanding the current electric power generation and transmission system is being challenged by even increasing the deployment of distributed renewable generation and storage systems. Energy storage can be used to store energy from utility during low-demand (off-peak) hours and deliver this energy back to the utility during high-demand (on-peak) hours. Furthermore, energy storage can be used with renewable sources to overcome some of their limitations such as their strong dependence on the weather conditions, which cannot be perfectly predicted, and their unmatched or out-of-synchronization generation peaks with the demand peaks. Generally, energy storage enhances the performance of distributed renewable sources and increases the efficiency of the entire power system. Moreover, energy storage allows for leveling the load, shaving peak demands, and furthermore, transacting power with the utility grid. This research proposes an energy management system (EMS) to manage the operation of distributed grid-tied battery micro-storage systems for stationary applications when operated with and without renewable sources. The term "micro" refers to the capacity of the energy storage compared to the grid capacity. The proposed management system employs four dynamic models; economic model, battery model, and load and weather forecasting models. These models, which are the main contribution of this research, are used in order to optimally control the operation of the micro-storage system (MSS) to maximize the economic return for the end-user when operated in an electricity spot market system.
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Date Issued: 2011
Identifier: CFE0003964, ucf:48712
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003964

Title: ANALYSIS OF THE FLORIDAÃ‚Â'S SHOWCASE GREEN ENVIROHOME WATER/WASTEWATER SYSTEMS AND DEVELOPMENT OF A COST-BENEFIT GREEN ROOF OPTIMIZATION MODEL.
Creator: Rivera, Brian, Chang, Ni-Bin, University of Central Florida
Abstract / Description: The Florida Showcase Green Envirohome (FSGE) incorporates many green technologies. FSGE is built to meet or exceed 12 green building guidelines and obtain 8 green building certificates. The two-story 3292 ft2 home is a Ã‚Â"Near Zero-Loss HomeÃ‚Â™Ã‚Â", Ã‚Â"Near Zero-Energy HomeÃ‚Â™Ã‚Â", "Near Zero-Runoff HomeÃ‚Â™", and Ã‚Â"Near Zero...
Show moreThe Florida Showcase Green Envirohome (FSGE) incorporates many green technologies. FSGE is built to meet or exceed 12 green building guidelines and obtain 8 green building certificates. The two-story 3292 ft2 home is a Ã‚Â"Near Zero-Loss HomeÃ‚Â™Ã‚Â", Ã‚Â"Near Zero-Energy HomeÃ‚Â™Ã‚Â", "Near Zero-Runoff HomeÃ‚Â™", and Ã‚Â"Near Zero-Maintenance HomeÃ‚Â™Ã‚Â". It is spawned from the consumer-driven necessity to build a home resistant to hurricanes, tornadoes, floods, fire, mold, termites, impacts, and even earthquakes given up to 500% increase in insurance premiums in natural disaster zones, the dwindling flexibility and coverage of insurance policies, and rising energy, water and maintenance costs (FSGE 2008). The FSGE captures its stormwater runoff from the green roof, metal roof and wood decking area and routes it to the sustainable water cistern. Graywater from the home (after being disinfected using ozone) is also routed to the sustainable water cistern. This water stored in the sustainable water cistern is used for irrigation of the green roof, ground level landscape, and for toilet flushing water. This study was done in two phases. During phase one, only stormwater runoff from the green roof, metal roof and wood decking area is routed to the sustainable water cistern. Then, during phase two, the water from the graywater system is added to the sustainable water cistern. The sustainable water cistern quality is analyzed during both phases to determine if the water is acceptable for irrigation and also if it is suitable for use as toilet flushing water. The water quality of the sustainable cistern is acceptable for irrigation. The intent of the home is to not pollute the environment, so as much nutrients as possible should be removed from the wastewater before it is discharged into the groundwater. Thus, the FSGE design is to evaluate a new on-site sewage treatment and disposal (OSTD) system which consists of a sorption media labeled as Bold and GoldTM filtration media. The Bold and GoldTM filtration media is a mixture of tire crumb and other materials. This new OSTD system has sampling ports through the system to monitor the wastewater quality as it passes through. Also, the effluent wastewater quality is compared to that of a conventional system on the campus of the University of Central Florida. The cost-benefit optimization model focused on designing a residential home which incorporated a green roof, cistern and graywater systems. This model had two forms, the base model and the grey linear model. The base model used current average cost of construction of materials and installation. The grey model used an interval for the cost of construction materials and green roof energy savings. Both models included a probabilistic term to describe the rainfall amount. The cost and energy operation of a typical Florida home was used as a case study for these models. Also, some of the parameters of the model were varied to determine their effect on the results. The modeling showed that the FSGE 4500 gallon cistern design was cost effective in providing irrigation water. Also, the green roof area could have been smaller to be cost effective, because the green roof cost is relatively much higher than the cost of a regular roof.
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Date Issued: 2010
Identifier: CFE0003297, ucf:48499
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003297

Title: Field Evaluation of Insync Adaptive Traffic Signal Control System in Multiple Environments Using Multiple Approaches.
Creator: Shafik, Md Shafikul Islam, Radwan, Essam, Abou-Senna, Hatem, Eluru, Naveen, University of Central Florida
Abstract / Description: Since the beginning of signalization of intersections, the management of traffic congestion is one of most critical challenges specifically for the city and urbanized area. Almost all the municipal agencies struggle to manage the perplexities associated with traffic congestion or signal control. The Adaptive Traffic Control System (ATCS), an advanced and major technological component of the Intelligent Transportation Systems (ITS) is considered the most dynamic and real-time traffic...
Show moreSince the beginning of signalization of intersections, the management of traffic congestion is one of most critical challenges specifically for the city and urbanized area. Almost all the municipal agencies struggle to manage the perplexities associated with traffic congestion or signal control. The Adaptive Traffic Control System (ATCS), an advanced and major technological component of the Intelligent Transportation Systems (ITS) is considered the most dynamic and real-time traffic management technology and has potential to effectively manage rapidly varying traffic flow relative to the current state-of-the-art traffic management practices.InSync ATCS is deployed in multiple states throughout the US and expanding on a large scale. Although there had been several 'Measure of Effectiveness' studies performed previously, the performance of InSync is not unquestionable especially because the previous studies failed to subject for multiple environments, approaches, and variables. Most studies are accomplished through a single approach using simple/na(&)#239;ve before-after method without any control group/parameter. They also lacked ample statistical analysis, historical, maturation and regression artifacts. An attempt to evaluate the InSync ATCS in varying conditions through multiple approaches was undertaken for the SR-434 and Lake Underhill corridor in Orange County, Florida. A before-after study with an adjacent corridor as control group and volume as a control parameter has been performed where data of multiple variables were collected by three distinct procedures. The average/floating-car method was utilized as a rudimentary data collection process and 'BlueMac' and 'InSync' system database was considered as secondary data sources. Data collected for three times a day for weekdays and weekends before and after the InSync ATCS was deployed.Results show variation in both performance and scale. It proved ineffective in some of the cases, especially for the left turns, total intersection queue/delay and when the intersection volumes approach capacity. The results are verified through appropriate statistical analysis.
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Date Issued: 2017
Identifier: CFE0006915, ucf:51687
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006915

Title: Design Disjunction for Resilient Reconfigurable Hardware.
Creator: Alzahrani, Ahmad, DeMara, Ronald, Yuan, Jiann-Shiun, Lin, Mingjie, Wang, Jun, Turgut, Damla, University of Central Florida
Abstract / Description: Contemporary reconfigurable hardware devices have the capability to achieve high performance, powerefficiency, and adaptability required to meet a wide range of design goals. With scaling challenges facing current complementary metal oxide semiconductor (CMOS), new concepts and methodologies supportingefficient adaptation to handle reliability issues are becoming increasingly prominent. Reconfigurable hardware and their ability to realize self-organization features are expected to play a key...
Show moreContemporary reconfigurable hardware devices have the capability to achieve high performance, powerefficiency, and adaptability required to meet a wide range of design goals. With scaling challenges facing current complementary metal oxide semiconductor (CMOS), new concepts and methodologies supportingefficient adaptation to handle reliability issues are becoming increasingly prominent. Reconfigurable hardware and their ability to realize self-organization features are expected to play a key role in designingfuture dependable hardware architectures. However, the exponential increase in density and complexity of current commercial SRAM-based field-programmable gate arrays (FPGAs) has escalated the overheadassociated with dynamic runtime design adaptation. Traditionally, static modular redundancy techniques areconsidered to surmount this limitation; however, they can incur substantial overheads in both area andpower requirements. To achieve a better trade-off among performance, area, power, and reliability, thisresearch proposes design-time approaches that enable fine selection of redundancy level based on target reliability goals and autonomous adaptation to runtime demands. To achieve this goal, three studies were conducted:First, a graph and set theoretic approach, named Hypergraph-Cover Diversity (HCD), is introduced as a preemptive design technique to shift the dominant costs of resiliency to design-time. In particular, union-freehypergraphs are exploited to partition the reconfigurable resources pool into highly separable subsets ofresources, each of which can be utilized by the same synthesized application netlist. The diverseimplementations provide reconfiguration-based resilience throughout the system lifetime while avoiding thesignificant overheads associated with runtime placement and routing phases. Evaluation on a Motion-JPEGimage compression core using a Xilinx 7-series-based FPGA hardware platform has demonstrated thepotential of the proposed FT method to achieve 37.5% area saving and up to 66% reduction in powerconsumption compared to the frequently-used TMR scheme while providing superior fault tolerance.Second, Design Disjunction based on non-adaptive group testing is developed to realize a low-overheadfault tolerant system capable of handling self-testing and self-recovery using runtime partial reconfiguration.Reconfiguration is guided by resource grouping procedures which employ non-linear measurements given by the constructive property of f-disjunctness to extend runtime resilience to a large fault space and realize a favorable range of tradeoffs. Disjunct designs are created using the mosaic convergence algorithmdeveloped such that at least one configuration in the library evades any occurrence of up to d resource faults, where d is lower-bounded by f. Experimental results for a set of MCNC and ISCAS benchmarks havedemonstrated f-diagnosability at the individual slice level with average isolation resolution of 96.4% (94.4%) for f=1 (f=2) while incurring an average critical path delay impact of only 1.49% and area cost roughly comparable to conventional 2-MR approaches. Finally, the proposed Design Disjunction method is evaluated as a design-time method to improve timing yield in the presence of large random within-die (WID) process variations for application with a moderately high production capacity.
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Date Issued: 2015
Identifier: CFE0006250, ucf:51086
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006250

Title: A Formative Process Evaluation Study of Teacher Usage of a Learning Management System in a K-12 Public School.
Creator: Franzese, Victoria, Gunter, Glenda, Swan, Bonnie, Hartshorne, Richard, Vitale, Thomas, Rath, Victoria, University of Central Florida
Abstract / Description: The purpose of this study is to explore teacher perceptions, concerns, and integration of a Learning Management System (LMS) in a K-12 public school. With more educational institutions adopting LMSs, it is imperative to examine teachers' concerns regarding the tool as teachers have an important role in how effectively an innovation(-)such as an LMS(-)is implemented (Lochner, Conrad, (&) Graham, 2015). Ultimately, adoption of an innovation can be successful if teachers have an understanding of...
Show moreThe purpose of this study is to explore teacher perceptions, concerns, and integration of a Learning Management System (LMS) in a K-12 public school. With more educational institutions adopting LMSs, it is imperative to examine teachers' concerns regarding the tool as teachers have an important role in how effectively an innovation(-)such as an LMS(-)is implemented (Lochner, Conrad, (&) Graham, 2015). Ultimately, adoption of an innovation can be successful if teachers have an understanding of the components leading to the innovation's success, such as the innovation's value in enhancing both the curriculum and the students' learning experiences (Lochner et al., 2015). This study used the Concerns-Based Adoption Model (CBAM) as a main framework to not only measure implementation of the LMS, but to also increase the likelihood of the LMS effecting positive change in schools (George, Hall, (&) Stiegelbauer, 2006). The framework's Stages of Concern Questionnaire (SoCQ) was used with participants to determine teachers' concerns. The sample population for this study consisted of secondary teachers at a public high school in central Florida in 2017. Out of the 125 teachers employed at the school, a total of 36 (n = 36) participated in the online survey. Three of the teachers surveyed then participated in interviews to provide additional insight.Data was analyzed and organized into five main topics: (a) Stages of Concern Profile; (b) teacher concerns; (c) benefits of the LMS; (d) barriers to the LMS; and (e) teacher needs. An analysis of the survey data revealed that the study's survey participants, on average, had the highest concerns at Stage 0 (Unconcerned), Stage 1 (Informational) and Stage 2 (Personal), thus indicating the group conformed to a non-user profile when it comes to LMS use. An analysis of the interview data revealed an overall positive disposition toward the LMS with the self-awareness that participants have more to learn about its capabilities. Results suggested that LMS implementation should be refined in order to allow participants to advance to higher stages of concern (George et al., 2006). Further research should be conducted on other areas of LMS implementation, including the students' perceptions and concerns when it comes to using the LMS.
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Date Issued: 2017
Identifier: CFE0006739, ucf:51834
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006739

Title: Zora.
Creator: Tyrrell, Genevieve, Roney, Lisa, Rushin, Patrick, Scott, John, University of Central Florida
Abstract / Description: This mixed-media memoir uses a variety of forms from short epigrammatic essays to straightforward stories and graphic narratives to explore the author's coming-of-age experiences augmented by chronic illness. Trying to succeed in the film industry, romance, and family situations, the young female narrator navigates the often unexpected or disappointing consequences of having an autonomic nervous system disorder. Relationships between conflicting identities emerge(-)between healthy versus sick...
Show moreThis mixed-media memoir uses a variety of forms from short epigrammatic essays to straightforward stories and graphic narratives to explore the author's coming-of-age experiences augmented by chronic illness. Trying to succeed in the film industry, romance, and family situations, the young female narrator navigates the often unexpected or disappointing consequences of having an autonomic nervous system disorder. Relationships between conflicting identities emerge(-)between healthy versus sick self, projected/envisioned versus actual self, and tough versus vulnerable self(-)as the narrator journeys toward a more complete and accepting self-understanding.
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Date Issued: 2013
Identifier: CFE0004763, ucf:49777
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004763

Title: Recognition of Complex Events in Open-source Web-scale Videos: Features, Intermediate Representations and their Temporal Interactions.
Creator: Bhattacharya, Subhabrata, Shah, Mubarak, Guha, Ratan, Laviola II, Joseph, Sukthankar, Rahul, Moore, Brian, University of Central Florida
Abstract / Description: Recognition of complex events in consumer uploaded Internet videos, captured under real-world settings, has emerged as a challenging area of research across both computer vision and multimedia community. In this dissertation, we present a systematic decomposition of complex events into hierarchical components and make an in-depth analysis of how existing research are being used to cater to various levels of this hierarchy and identify three key stages where we make novel contributions,...
Show moreRecognition of complex events in consumer uploaded Internet videos, captured under real-world settings, has emerged as a challenging area of research across both computer vision and multimedia community. In this dissertation, we present a systematic decomposition of complex events into hierarchical components and make an in-depth analysis of how existing research are being used to cater to various levels of this hierarchy and identify three key stages where we make novel contributions, keeping complex events in focus. These are listed as follows: (a) Extraction of novel semi-global features -- firstly, we introduce a Lie-algebra based representation of dominant camera motion present while capturing videos and show how this can be used as a complementary feature for video analysis. Secondly, we propose compact clip level descriptors of a video based on covariance of appearance and motion features which we further use in a sparse coding framework to recognize realistic actions and gestures. (b) Construction of intermediate representations -- We propose an efficient probabilistic representation from low-level features computed from videos, basedon Maximum Likelihood Estimates which demonstrates state of the art performancein large scale visual concept detection, and finally, (c) Modeling temporal interactions between intermediate concepts -- Using block Hankel matrices and harmonic analysis of slowly evolving Linear Dynamical Systems, we propose two new discriminative feature spaces for complex event recognition and demonstratesignificantly improved recognition rates over previously proposed approaches.
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Date Issued: 2013
Identifier: CFE0004817, ucf:49724
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004817

Title: Streamlining the Acquisition Process: Systems Analysis for Improving Army Acquisition Corps Officer Management.
Creator: Chu-Quinn, Shawn, Kincaid, John, Wiegand, Rudolf, Mohammad, Syed, University of Central Florida
Abstract / Description: The Army Acquisition Officer lacks proficient experience needed to fill key leadership positions within the Acquisition Corps. The active duty Army officer is considered for the Acquisition Corps functional area between their 5th and 9th years of service as an officer (-) after completing initial career milestones. The new Acquisition Corps officer is the rank of senior Captain or Major when he arrives to his first acquisition assignment with a proficiency level of novice (in acquisition)....
Show moreThe Army Acquisition Officer lacks proficient experience needed to fill key leadership positions within the Acquisition Corps. The active duty Army officer is considered for the Acquisition Corps functional area between their 5th and 9th years of service as an officer (-) after completing initial career milestones. The new Acquisition Corps officer is the rank of senior Captain or Major when he arrives to his first acquisition assignment with a proficiency level of novice (in acquisition). The Army officer may be advanced in his primary career branch, but his level decreases when he is assigned into the Acquisition Corps functional area. The civilian grade equivalent to the officer is a GS-12 or GS-13 whose proficiency level is advanced in his career field. The purpose of this study is to use a systems analysis approach to decompose the current acquisition officer professional development system, in order to study how well the current active duty officer flow works and how well it interacts or influences an acquisition officer's professional development; and to propose a potential solution to assist in the management of Army acquisition officers, so they gain proficiency through not only education and training, but also the hands-on experience that is needed to fill key leadership positions in the Army Acquisition Corps. An increased proficiency and proven successful track record in the acquisition workforce is the basis to positively affect acquisition streamlining processes within the Department of Defense by making good decisions through quality experience.
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Date Issued: 2015
Identifier: CFE0005590, ucf:50254
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005590

Title: Impacts of Complexity and Timing of Communication Interruptions on Visual Detection Tasks.
Creator: Stader, Sally, Mouloua, Mustapha, Hancock, Peter, Neider, Mark, Kincaid, John, University of Central Florida
Abstract / Description: Auditory preemption theory suggests two competing assumptions for the attention-capturing and performance-altering properties of auditory tasks. In onset preemption, attention is immediately diverted to the auditory channel. Strategic preemption involves a decision process in which the operator maintains focus on more complex auditory messages. The limitation in this process is that the human auditory, or echoic, memory store has a limit of 2 to 5 seconds, after which the message must be...
Show moreAuditory preemption theory suggests two competing assumptions for the attention-capturing and performance-altering properties of auditory tasks. In onset preemption, attention is immediately diverted to the auditory channel. Strategic preemption involves a decision process in which the operator maintains focus on more complex auditory messages. The limitation in this process is that the human auditory, or echoic, memory store has a limit of 2 to 5 seconds, after which the message must be processed or it decays. In contrast, multiple resource theory suggests that visual and auditory tasks may be efficiently time-shared because two different pools of cognitive resources are used. Previous research regarding these competing assumptions has been limited and equivocal. Thus, the current research focused on systematically examining the effects of complexity and timing of communication interruptions on visual detection tasks. It was hypothesized that both timing and complexity levels would impact detection performance in a multi-task environment. Study 1 evaluated the impact of complexity and timing of communications occurring before malfunctions in an ongoing visual detection task. Twenty-four participants were required to complete each of the eight timing blocks that included simple or complex communications occurring simultaneously, and at 2, 5, or 8 seconds before detection events. For simple communications, participants repeated three pre-recorded words. However, for complex communications, they generated three words beginning with the same last letter of a word prompt. Results indicated that complex communications at two seconds or less occurring before a visual detection event significantly impacted response time with a 1.3 to 1.6 second delay compared to all the other timings. Detection accuracy for complex communication tasks under the simultaneous condition was significantly degraded compared to simple communications at five seconds or more prior to the task. This resulted in a 20% decline in detection accuracy. Additionally, participants' workload ratings for complex communications were significantly higher than simple communications. Study 2 examined the timing of communications occurring at the corresponding seconds after the visual detection event. Twenty-four participants were randomly assigned to the communication complexity and timing blocks as in study 1. The results did not find significant performance effects of timing or complexity of communications on detection performance. However the workload ratings for the 2 and 5 second complex communication presentations were higher compared to the same simple communication conditions. Overall, these findings support the strategic preemption assumption for well-defined, complex communications. The onset preemption assumption for simple communications was not supported. These results also suggest that the boundaries of the multiple resource theory assumption may exist up to the limits of the echoic memory store. Figures of merit for task performance under the varying levels of timing and complexity are presented. Several theoretical and practical implications are discussed.
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Date Issued: 2014
Identifier: CFE0005420, ucf:50415
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005420

Title: Autonomous Recovery of Reconfigurable Logic Devices using Priority Escalation of Slack.
Creator: Imran, Syednaveed, DeMara, Ronald, Mikhael, Wasfy, Lin, Mingjie, Yuan, Jiann-Shiun, Geiger, Christopher, University of Central Florida
Abstract / Description: Field Programmable Gate Array (FPGA) devices offer a suitable platform for survivable hardware architectures in mission-critical systems. In this dissertation, active dynamic redundancy-based fault-handling techniques are proposed which exploit the dynamic partial reconfiguration capability of SRAM-based FPGAs. Self-adaptation is realized by employing reconfiguration in detection, diagnosis, and recovery phases.To extend these concepts to semiconductor aging and process variation in the deep...
Show moreField Programmable Gate Array (FPGA) devices offer a suitable platform for survivable hardware architectures in mission-critical systems. In this dissertation, active dynamic redundancy-based fault-handling techniques are proposed which exploit the dynamic partial reconfiguration capability of SRAM-based FPGAs. Self-adaptation is realized by employing reconfiguration in detection, diagnosis, and recovery phases.To extend these concepts to semiconductor aging and process variation in the deep submicron era, resilient adaptable processing systems are sought to maintain quality and throughput requirements despite the vulnerabilities of the underlying computational devices. A new approach to autonomous fault-handling which addresses these goals is developed using only a uniplex hardware arrangement. It operates by observing a health metric to achieve Fault Demotion using Reconfigurable Slack (FaDReS). Here an autonomous fault isolation scheme is employed which neither requires test vectors nor suspends the computational throughput, but instead observes the value of a health metric based on runtime input. The deterministic flow of the fault isolation scheme guarantees success in a bounded number of reconfigurations of the FPGA fabric.FaDReS is then extended to the Priority Using Resource Escalation (PURE) online redundancy scheme which considers fault-isolation latency and throughput trade-offs under a dynamic spare arrangement. While deep-submicron designs introduce new challenges, use of adaptive techniques are seen to provide several promising avenues for improving resilience. The scheme developed is demonstrated by hardware design of various signal processing circuits and their implementation on a Xilinx Virtex-4 FPGA device. These include a Discrete Cosine Transform (DCT) core, Motion Estimation (ME) engine, Finite Impulse Response (FIR) Filter, Support Vector Machine (SVM), and Advanced Encryption Standard (AES) blocks in addition to MCNC benchmark circuits. A significant reduction in power consumption is achieved ranging from 83% for low motion-activity scenes to 12.5% for high motion activity video scenes in a novel ME engine configuration. For a typical benchmark video sequence, PURE is shown to maintain a PSNR baseline near 32dB. The diagnosability, reconfiguration latency, and resource overhead of each approach is analyzed. Compared to previous alternatives, PURE maintains a PSNR within a difference of 4.02dB to 6.67dB from the fault-free baseline by escalating healthy resources to higher-priority signal processing functions. The results indicate the benefits of priority-aware resiliency over conventional redundancy approaches in terms of fault-recovery, power consumption, and resource-area requirements. Together, these provide a broad range of strategies to achieve autonomous recovery of reconfigurable logic devices under a variety of constraints, operating conditions, and optimization criteria.
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Date Issued: 2013
Identifier: CFE0005006, ucf:50005
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005006

Title: Modeling and Simulation of All-electric Aircraft Power Generation and Actuation.
Creator: Woodburn, David, Wu, Xinzhang, Batarseh, Issa, Georgiopoulos, Michael, Haralambous, Michael, Chow, Louis, University of Central Florida
Abstract / Description: Modern aircraft, military and commercial, rely extensively on hydraulic systems. However, there is great interest in the avionics community to replace hydraulic systems with electric systems. There are physical challenges to replacing hydraulic actuators with electromechanical actuators (EMAs), especially for flight control surface actuation. These include dynamic heat generation and power management.Simulation is seen as a powerful tool in making the transition to all-electric aircraft by...
Show moreModern aircraft, military and commercial, rely extensively on hydraulic systems. However, there is great interest in the avionics community to replace hydraulic systems with electric systems. There are physical challenges to replacing hydraulic actuators with electromechanical actuators (EMAs), especially for flight control surface actuation. These include dynamic heat generation and power management.Simulation is seen as a powerful tool in making the transition to all-electric aircraft by predicting the dynamic heat generated and the power flow in the EMA. Chapter 2 of this dissertation describes the nonlinear, lumped-element, integrated modeling of a permanent magnet (PM) motor used in an EMA. This model is capable of representing transient dynamics of an EMA, mechanically, electrically, and thermally.Inductance is a primary parameter that links the electrical and mechanical domains and, therefore, is of critical importance to the modeling of the whole EMA. In the dynamic mode of operation of an EMA, the inductances are quite nonlinear. Chapter 3 details the careful analysis of the inductances from finite element software and the mathematical modeling of these inductances for use in the overall EMA model.Chapter 4 covers the design and verification of a nonlinear, transient simulation model of a two-step synchronous generator with three-phase rectifiers. Simulation results are shown.
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Date Issued: 2013
Identifier: CFE0005074, ucf:49975
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005074

Title: Stochastic Optimization for Integrated Energy System with Reliability Improvement Using Decomposition Algorithm.
Creator: Huang, Yuping, Zheng, Qipeng, Xanthopoulos, Petros, Pazour, Jennifer, Liu, Andrew, University of Central Florida
Abstract / Description: As energy demands increase and energy resources change, the traditional energy system has beenupgraded and reconstructed for human society development and sustainability. Considerable studies have been conducted in energy expansion planning and electricity generation operations bymainly considering the integration of traditional fossil fuel generation with renewable generation.Because the energy market is full of uncertainty, we realize that these uncertainties have continuously challenged...
Show moreAs energy demands increase and energy resources change, the traditional energy system has beenupgraded and reconstructed for human society development and sustainability. Considerable studies have been conducted in energy expansion planning and electricity generation operations bymainly considering the integration of traditional fossil fuel generation with renewable generation.Because the energy market is full of uncertainty, we realize that these uncertainties have continuously challenged market design and operations, even a national energy policy. In fact, only a few considerations were given to the optimization of energy expansion and generation taking into account the variability and uncertainty of energy supply and demand in energy markets. This usually causes an energy system unreliable to cope with unexpected changes, such as a surge in fuel price, a sudden drop of demand, or a large renewable supply fluctuation. Thus, for an overall energy system, optimizing a long-term expansion planning and market operation in a stochastic environment are crucial to improve the system's reliability and robustness.As little consideration was paid to imposing risk measure on the power management system, this dissertation discusses applying risk-constrained stochastic programming to improve the efficiency,reliability and economics of energy expansion and electric power generation, respectively. Considering the supply-demand uncertainties affecting the energy system stability, three different optimization strategies are proposed to enhance the overall reliability and sustainability of an energy system. The first strategy is to optimize the regional energy expansion planning which focuses on capacity expansion of natural gas system, power generation system and renewable energy system, in addition to transmission network. With strong support of NG and electric facilities, the second strategy provides an optimal day-ahead scheduling for electric power generation system incorporating with non-generation resources, i.e. demand response and energy storage. Because of risk aversion, this generation scheduling enables a power system qualified with higher reliability and promotes non-generation resources in smart grid. To take advantage of power generation sources, the third strategy strengthens the change of the traditional energy reserve requirements to risk constraints but ensuring the same level of systems reliability In this way we can maximize the use of existing resources to accommodate internal or/and external changes in a power system.All problems are formulated by stochastic mixed integer programming, particularly consideringthe uncertainties from fuel price, renewable energy output and electricity demand over time. Taking the benefit of models structure, new decomposition strategies are proposed to decompose the stochastic unit commitment problems which are then solved by an enhanced Benders Decomposition algorithm. Compared to the classic Benders Decomposition, this proposed solution approachis able to increase convergence speed and thus reduce 25% of computation times on the same cases.
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Date Issued: 2014
Identifier: CFE0005506, ucf:50339
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005506

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