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- Title
- Third-order optical nonlinearities for integrated microwave photonics applications.
- Creator
-
Malinowski, Marcin, Fathpour, Sasan, Delfyett, Peter, Christodoulides, Demetrios, Lyakh, Arkadiy, University of Central Florida
- Abstract / Description
-
The field of integrated photonics aims at compressing large and environmentally-sensitive opticalsystems to micron-sized circuits that can be mass-produced through existing semiconductor fabri-cation facilities. The integration of optical components on single chips is pivotal to the realizationof miniature systems with high degree of complexity. Such novel photonic chips find abundant ap-plications in optical communication, spectroscopy and signal processing. This work concentrateson...
Show moreThe field of integrated photonics aims at compressing large and environmentally-sensitive opticalsystems to micron-sized circuits that can be mass-produced through existing semiconductor fabri-cation facilities. The integration of optical components on single chips is pivotal to the realizationof miniature systems with high degree of complexity. Such novel photonic chips find abundant ap-plications in optical communication, spectroscopy and signal processing. This work concentrateson harnessing nonlinear phenomena to this avail.The first part of this dissertation discusses, both from component and system level, the developmentof a frequency comb source with a semiconductor mode-locked laser at its heart. New nonlinear de-vices for supercontinuum and second-harmonic generations are developed and their performance isassessed inside the system. Theoretical analysis of a hybrid approach with synchronously-pumpedKerr cavity is also provided. The second part of the dissertation investigates stimulated Brillouinscattering (SBS) in integrated photonics. A fully-tensorial open-source numerical tool is developedto study SBS in optical waveguides composed of crystalline materials, particularly silicon. SBS isdemonstrated in an all-silicon optical platform.
Show less - Date Issued
- 2019
- Identifier
- CFE0007674, ucf:52497
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007674
- Title
- The efficacy and feasibility of neuropsychological services in a primary care setting.
- Creator
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Herring, Danielle, Paulson, Daniel, Sherod, Megan, Blaney, Cerissa, Cannarozzi, Maria, University of Central Florida
- Abstract / Description
-
Integrated primary care assimilates psychologists into the primary care setting, thus improving health outcomes and physician satisfaction. Neuropsychology has also begun to assimilate into primary care, as neurocognitive impairment is a correlate of many medical disorders. Subjective cognitive decline (SCD), a common complaint among older adults, is an increasingly recognized warning sign of non-normative cognitive aging. These patients typically present first to their primary care providers...
Show moreIntegrated primary care assimilates psychologists into the primary care setting, thus improving health outcomes and physician satisfaction. Neuropsychology has also begun to assimilate into primary care, as neurocognitive impairment is a correlate of many medical disorders. Subjective cognitive decline (SCD), a common complaint among older adults, is an increasingly recognized warning sign of non-normative cognitive aging. These patients typically present first to their primary care providers who may play a critical role in the early detection of cognitive impairment. Given the growing awareness about cognitive health and disability, the importance of neuropsychological assessment as a standard component of integrated care has been recognized by providers. Thus, the purpose of this study is to examine the efficacy and feasibility of neuropsychological services, for memory concerns, in a community primary care setting. The study also explored the relationship between SCD and performance on neurocognitive measures and satisfaction levels for both patient participants and medical providers. A total of 16 patient participants completed the study. On average, patients were in their late-60's and mostly female and Caucasian. Participants completed a brief interview, neurocognitive evaluation, self-report measures of SCD and mood, and satisfaction survey. Results did not reveal significant correlations between SCD and neurocognitive performance. Significantly more referrals were made to the onsite neurocognitive clinic, than were made for outside services in a nine-month period preceding the described program. Patients referred to the onsite clinic were also significantly more likely to have an accessible report located in their EMR than those referred offsite. Both participants and medical providers were reportedly satisfied with clinic services. Results suggest that a clinic of this nature has promising benefits and is well-liked by both patients and providers, though barriers related to full utilization of services remain a challenge. Further research with a larger, more diverse sample is recommended. ?
Show less - Date Issued
- 2019
- Identifier
- CFE0007653, ucf:52508
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007653
- Title
- AN OPTIMAL CONTROL APPROACH FOR DETERMINATION OF THE HEAT LOSS COEFFICIENT IN AN ICS SOLAR DOMESTIC WATER HEATING SYSTEM.
- Creator
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Gil, Camilo, Simaan, Marwan, University of Central Florida
- Abstract / Description
-
Water heating in a typical home in the U.S. accounts for a significant portion (between 14% and 25%) of the total homeÂÂÂÂ's annual energy consumption. The objective of considerably reducing the homeÂÂÂÂ's energy consumption from the utilities calls for the use of onsite renewable energy...
Show moreWater heating in a typical home in the U.S. accounts for a significant portion (between 14% and 25%) of the total homeÂÂÂÂ's annual energy consumption. The objective of considerably reducing the homeÂÂÂÂ's energy consumption from the utilities calls for the use of onsite renewable energy systems. Integral Collector Storage (ICS) solar domestic water heating systems are an alternative to help meet the hot water energy demands in a household. In order to evaluate the potential benefits and contributions from the ICS system, it is important that the parameter values included in the model used to estimate the systemÂÂÂÂ's performance are as accurate as possible. The overall heat loss coefficient (Uloss) in the model plays an important role in the performance prediction methodology of the ICS. This work presents a new and improved methodology to determine Uloss as a function of time in an ICS system using a systematic optimal control theoretic approach. This methodology is based on the derivation of a new nonlinear state space model of the system, and the formulation of a quadratic performance function whose minimization yields estimates of Uloss values that can be used in computer simulations to improve the performance prediction of the ICS system, depending on the desired time of the year and hot water draw profile. Simulation results show that predictions of the systemÂÂÂÂ's performance based on these estimates of Uloss are considerably more accurate than the predictions based on current existing methods for estimating Uloss.
Show less - Date Issued
- 2010
- Identifier
- CFE0003266, ucf:48525
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003266
- Title
- Finding Sundays: A Collection of Stories.
- Creator
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Martin, Tamra, Neal, Mary, Hubbard, Susan, Thaxton, Terry, University of Central Florida
- Abstract / Description
-
Finding Sundays: A Collection of Stories is a collection that explores the lives of people in the fictional town of Hickory Springs, Virginia. The title story (")Finding Sundays(") follows the life of Deacon Taylor and connects him to the characters around him in the proceeding pieces. These stories explore the lives of Deacon, his family, and his childhood friend, Sandra. The focus of this collection is not meant to be about spirituality or religion in general, although these exist as themes...
Show moreFinding Sundays: A Collection of Stories is a collection that explores the lives of people in the fictional town of Hickory Springs, Virginia. The title story (")Finding Sundays(") follows the life of Deacon Taylor and connects him to the characters around him in the proceeding pieces. These stories explore the lives of Deacon, his family, and his childhood friend, Sandra. The focus of this collection is not meant to be about spirituality or religion in general, although these exist as themes in the background of the stories. Instead, it is meant to look at how the lives of people connected through a church and a small town setting can affect them and lead them on different paths through the choices they make. Their personal struggles and challenges help them to either discover who they are or lose a piece of themselves in the process, which is especially true for Deacon. He is the character who appears as a child, as an adolescent, and as an adult. Self-discovery is not always peaceful or satisfying for him or any of the characters around him, and their individual journeys show this process and the different events that come from the choices they make. This collection focuses on how religious roots, friendships, and familial connections, or the lack of such bonds, affect the characters' own personal views and decisions as well as how they relate to those around them.
Show less - Date Issued
- 2012
- Identifier
- CFE0004408, ucf:49386
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004408
- Title
- PROJECT CHILD® AND NON-PROJECT CHILD® SCHOOL PERFORMANCE ON FCAT® READING, MATHEMATICS AND WRITING.
- Creator
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Chappell, Julie, Hartle, Lynn, University of Central Florida
- Abstract / Description
-
Project CHILD® (Changing How Instruction for Learning is Delivered) provides an avenue for educational change using a triangulated approach. Using data from the Florida Department of Education, this research studies the Project CHILD® learning approach on preparing students for success on portions of the Florida Comprehensive Assessment Test (FCAT®) using results from fifteen charter schools in the state of Florida,...
Show moreProject CHILD® (Changing How Instruction for Learning is Delivered) provides an avenue for educational change using a triangulated approach. Using data from the Florida Department of Education, this research studies the Project CHILD® learning approach on preparing students for success on portions of the Florida Comprehensive Assessment Test (FCAT®) using results from fifteen charter schools in the state of Florida, seven participating in Project CHILD® and eight non-participating charter schools for the 2008-2009 school-year. Dispersion statistics such as range and standard deviation as well as independent t tests are computed to compare the percentage of students in grades three to five scoring levels 3 and higher on the reading and mathematics portions, and fourth grade students scoring a 3.5 or higher on the writing assessment of the FCAT®. Project CHILD® schools had smaller ranges and standard deviations in the majority of the comparisons. Descriptively, this suggests that students in the Project CHILD® schools are performing closer to the school average. There were no statistically significance differences between the Project CHILD® schools and non-Project CHILD® schools for grade level comparisons, nor on any grade level aggregate outcomes (i.e., grades 3-5 school FCAT® reading, mathematics, or writing mean). However moderate effect sizes were seen for reading in grade four and writing assessments in grade four. The non-statistically significant findings were likely due to low power, and the moderate effect sizes suggest evidence of practical significance.
Show less - Date Issued
- 2010
- Identifier
- CFE0003355, ucf:48444
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003355
- Title
- An Investigation of Media Coverage of a Local Crisis: The Courts, the Orange County School Board and the Community.
- Creator
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Rupp, Evelyn S., Fedler, Fred, Social Sciences
- Abstract / Description
-
Florida Technological University College of Social Sciences Thesis
- Date Issued
- 1974
- Identifier
- CFR0011949, ucf:53101
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFR0011949
- Title
- Design and Simulation of Device Failure Models for Electrostatic Discharge (ESD) Event.
- Creator
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Miao, Meng, Sundaram, Kalpathy, Yuan, Jiann-Shiun, Gong, Xun, Jin, Yier, Salcedo, Javier, University of Central Florida
- Abstract / Description
-
In this dissertation, the research mainly focused on discussing ESD failure event simulation and ESD modeling, seeking solutions for ESD issues by simulating ESD event and predict possible ESD reliability problem in IC design. The research involves failure phenomenon caused by ESD/ EOS stress, mainly on the thermal failure due to inevitable self-heating during an ESD stress. Standard Complementary Metal-Oxide-Semiconductor (CMOS) process and high voltage Doublediffusion Metal-Oxide...
Show moreIn this dissertation, the research mainly focused on discussing ESD failure event simulation and ESD modeling, seeking solutions for ESD issues by simulating ESD event and predict possible ESD reliability problem in IC design. The research involves failure phenomenon caused by ESD/ EOS stress, mainly on the thermal failure due to inevitable self-heating during an ESD stress. Standard Complementary Metal-Oxide-Semiconductor (CMOS) process and high voltage Doublediffusion Metal-Oxide-Semiconductor (DMOS) process are used for design of experiment. A multi-function test platform High Power Pulse Instrument (HPPI) is used for ESD event evaluation and device characterization. SPICE-like software ADICE is for back-end simulation.Electrostatic Discharges (ESD) is one of the hazard that may affect IC circuit function and cause serious damage to the chip. The importance of ESD protection has been raised since the CMOS technology advanced and the dimension of transistors scales down. On the other hand, the variety of applications of chips is also making corresponding ESD protection difficult to meet different design requirement. Aside from typical requirements such as core circuit operation voltage, maximum accepted leakage current, breakdown conditions for the process and overall device sizes, special applications like radio frequency and power electronic requires ESD to be low parasitic capacitance and can sustain high level energy. In that case, a proper ESD protection design demands not only a robust ESD protection scheme, but co-design with the inner circuit. For that purpose, it is necessary to simulate the results of ESD impact on IC and find out possible weak point of the circuit and improve it. The first step of the simulation is to have corresponding models available. Unfortunately, ESD models, especially there are lack of circuit-level ESD models that provide quick and accurate prediction of ESD event.In this dissertation paper, ESD models, especially ESD failure models for device thermal failure are introduced, with modeling methodology accordingly. First, an introduction for ESD event and typical ESD protection schemes are introduced. Its purpose is to give basic concept of ESD. For ESD failure models, two typical types can be categorized depends on the physical mechanisms that cause the ESD damage. One is the gate oxide breakdown, which is electric field related. The other is the thermal-related failure, which stems from the self-heating effect associated with the large current passing through the ESD protection structure. The first one has become increasingly challenging with the aggressive scaling of the gate dielectric in advanced processes and ESD protection for that need to be carefully designed. The second one, thermal failure widely exists in semiconductor devices as long as there is ESD current flow through the device and accumulate heat at junctions. Considering the universality of thermal failure in ESD device, it is imperative to establish a model to simulate ESD caused thermal failure.Several works related to ESD model can be done. One crucial part for a failure model is to define the failure criterion. As common solution for ESD simulation and failure prediction. The maximum current level or breakdown voltage is used to judge whether a device fails under ESD stresses. Such failure criteria based on measurable voltage or current values are straightforward and can be easy to implemented in simulation tools. However, the shortcoming of these failure criteria is each failure criterion is specifically designed for certain ESD stress condition. For example, the failure voltage level for Human Body Model and Charged Device Model are quite different, and it is hard to judge a device's ESD capability under standard test conditions based on its transmission line pulse test result. So it is necessary to look deeper into the physical mechanism of device failure under ESD and find a more universal failure criterion for various stress conditions.As one of the major failure mechanisms, thermal failure evaluated by temperature is a more universal failure criterion for device failure under ESD stress. Whatever the stress model is, the device will fail if a critical temperature is reached at certain part inside the device and cause structural damage. Then finding out that critical temperature is crucial to define the failure point for device thermal failure. One chapter of this dissertation will focus on discussing this issue and propose a simple method to give close estimation of the real failure temperature for typical ESD devices.Combined these related works, a comprehensive diode model for ESD simulation is proposed. Using existing ESD models, diode I-V characteristic from low current turn-on to high current saturation can be simulated. By using temperature as the failure criterion, the last point of diode operation, or the second breakdown point, can be accurately predicted. Additional investigation of ESD capability of devices for special case like vertical GaN diode is discussed in Chapter IV. Due to the distinct material property of GaN, the vertical GaN diode exhibits unique and interesting quasi-static I-V curves quite different from conventional silicon semiconductor devices. And that I-V curve varies with different pulse width, indicating strong conductivity modulation of diode neutral region that will delay the complete turn-on of the vertical GaN diode.
Show less - Date Issued
- 2017
- Identifier
- CFE0006626, ucf:51291
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006626
- Title
- Provider Recommendation of HPV Vaccination: Bridging the Intention-Behavior Gap.
- Creator
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Landis, Erica, Neuberger, Lindsay, Sandoval, Jennifer, Miller, Ann, University of Central Florida
- Abstract / Description
-
The present study, guided by preproduction formative research principles, employed in-depth interviews and a brief survey with pediatric healthcare providers (N=15) to investigate the consistency between behavioral intention to strongly recommend the HPV vaccine, and implementation of the actual behavior. Specifically, the Integrative Model of Behavioral Prediction (IMBP) was used as a framework to examine the impact of skills and environmental constraints on that behavioral intention...
Show moreThe present study, guided by preproduction formative research principles, employed in-depth interviews and a brief survey with pediatric healthcare providers (N=15) to investigate the consistency between behavioral intention to strongly recommend the HPV vaccine, and implementation of the actual behavior. Specifically, the Integrative Model of Behavioral Prediction (IMBP) was used as a framework to examine the impact of skills and environmental constraints on that behavioral intention-behavioral performance relationship. Results suggest providers intend to strongly recommend the HPV vaccine at a high level, but actually recommend the vaccine with a slightly lesser frequency. A thematic analysis of interview transcripts yielded a list of skills (e.g., tact, cultural competence) and environmental constraints (e.g., a lack of policy or school entry requirement, limited time designated for each patient) that contribute to that consistency gap. Additionally, healthcare providers indicated several preferences on training design (e.g., Continuing Medical Education course, delivered by medical and communication professionals) that could be used to inform future message construction. Suggestions for overcoming the environmental constraints reported by providers are presented, and implications for incorporating the emergent skills and preferences into training as a novel strategy for improving provider communication about the HPV vaccine outlined.
Show less - Date Issued
- 2016
- Identifier
- CFE0006132, ucf:51162
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006132
- Title
- An Applied Organizational Analysis of School Factors Affecting Technology Integration within the Context of Literacy Instruction.
- Creator
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Rawlinson, D'Ann, Boote, David, Zygouris-Coe, Vassiliki, Little, Mary, Pawlas, George, Behrens, Cherie, University of Central Florida
- Abstract / Description
-
The purpose of this Dissertation in Practice was to analyze the organizational factors affecting technology integration within the context of literacy instruction at a single school site that was preparing to implement a 1:1 mobile device initiative in all K-5 classrooms the following academic year. This was achieved through conducting an organizational analysis using a multi-frame model developed by Bolman and Deal (2008). This study used a convergent parallel mixed methods research design...
Show moreThe purpose of this Dissertation in Practice was to analyze the organizational factors affecting technology integration within the context of literacy instruction at a single school site that was preparing to implement a 1:1 mobile device initiative in all K-5 classrooms the following academic year. This was achieved through conducting an organizational analysis using a multi-frame model developed by Bolman and Deal (2008). This study used a convergent parallel mixed methods research design consisting of teacher and administrator interviews, a quantitative and qualitative survey, and classroom observational data. One main evaluation question was designed to frame this organizational analysis: What organizational factors support and impede technology integration within the context of literacy instruction? To answer the main evaluation question, the evaluator collected data to answer six evaluation sub-questions. The evaluation sub-questions were developed to ensure that data was being collected among Bolman and Deal's (2008) four frames. In the context of integrating technology into literacy instruction, the data collected in this study suggest that the organizational strategies and issues within the human resource frame are impacting, and are impacted by, the organization's political, structural, and symbolic practices. The teachers' lack of opportunities to develop the requisite knowledge, experience, and skills needed to integrate technology into literacy instruction seem to have impacted the teachers' level of technology integration as well as their levels of concern. Data from this organizational analysis indicated that the lack of time was a major obstacle in learning how to integrate mobile devices into literacy instruction. The school's current team-based organizational model, while supporting other aspects of their education practices, may create structural and political barriers to effectively implement the 1:1 mobile device initiative. Observations and interviews suggested that the school values technology to support basic literacy skills, but not the transformative role of technology on literacy in today's society. Using all four frames of the Bolman and Deal's (2008) model allows an organization to look beyond one frame, such as developing human resources through professional development, when working towards implementing a school-wide initiative effectively. Although tailored professional development is necessary for teachers to learn how to integrate technology into literacy instruction, the professional development will not be effective without greater stability in the instructional staff, and focused political and structural solutions that will support the instructional staff's professional learning and implementation.
Show less - Date Issued
- 2015
- Identifier
- CFE0005989, ucf:50768
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005989
- Title
- Determinants of hospital efficiency and patient safety in the United States.
- Creator
-
Shettian, Kruparaj, Wan, Thomas, Noblin, Alice, Gurupur, Varadraj, Cobb, Enesha, Anderson, Kim, University of Central Florida
- Abstract / Description
-
Hospitals engage in undertakings on a continual basis to enhance IT capabilities, diffusion of innovations, hospital-physician integration, and standardization to improve their performance. This empirical study explored the interdependence of three macro-level structural factors and their independent impact on the hospital performance measures efficiency and patient safety, with standardization as an important mediator. The researcher conducted a cross-sectional analysis of multiple data sets...
Show moreHospitals engage in undertakings on a continual basis to enhance IT capabilities, diffusion of innovations, hospital-physician integration, and standardization to improve their performance. This empirical study explored the interdependence of three macro-level structural factors and their independent impact on the hospital performance measures efficiency and patient safety, with standardization as an important mediator. The researcher conducted a cross-sectional analysis of multiple data sets from public user files on the acute care hospital industry. The theoretical underpinnings of the study included the structure-process-outcome theory and institutional isomorphism theory. The statistical analysis comprised confirmatory factor analysis (CFA) and covariance structural equation modeling (SEM). The study comprised data for 2,352 acute care hospitals in the United States, which represented more than half of the hospital population. As expected by the hypotheses, the study demonstrated that IT capability, hospital-physician integration, and innovativeness directly affect the variability in standardization, but they did not directly influence the variation in hospital efficiency and patient safety. This revealed that hospitals should focus on standardization because it is the mediating process between structural variables and performance variables. The results indicated a strong negative influence of standardization on hospital efficiency and a weak positive influence on patient safety. The study confirmed the triadic model that (")structure(") influences the process, which in turn influences organizational outcomes. As standardization through coercive, mimetic, and normative pressure mechanisms becomes more common through system integration and increased collaborative governance, more research on how the implementation of standards may perpetuate isomorphism or uniformity is imperative. The researcher recommends future studies to employ a longitudinal study design to explore the determinants of a variety of performance and outcome indicators, such as patient satisfaction, timeliness of care, the effectiveness of care, and equity/financial performance in addition to patient safety and hospital efficiency.
Show less - Date Issued
- 2017
- Identifier
- CFE0006794, ucf:51810
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006794
- Title
- Structure-preserving finite difference methods for linearly damped differential equations.
- Creator
-
Bhatt, Ashish, Moore, Brian, Choudhury, Sudipto, Gurel, Basak, Kauffman, Jeffrey L., University of Central Florida
- Abstract / Description
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Differential equations (DEs) model a variety of physical phenomena in science and engineering. Many physical phenomena involve conservative or dissipative forces, which manifest themselves as qualitative properties of DEs that govern these phenomena. Since only a few and simplistic models are known to have exact solutions, approximate solution techniques, such as numerical integration, are used to reveal important insights about solution behavior and properties of these models. Numerical...
Show moreDifferential equations (DEs) model a variety of physical phenomena in science and engineering. Many physical phenomena involve conservative or dissipative forces, which manifest themselves as qualitative properties of DEs that govern these phenomena. Since only a few and simplistic models are known to have exact solutions, approximate solution techniques, such as numerical integration, are used to reveal important insights about solution behavior and properties of these models. Numerical integrators generally result in undesirable quantitative and qualitative errors . Standard numerical integrators aim to reduce quantitative errors, whereas geometric (numerical) integrators aim to reduce or eliminate qualitative errors, as well, in order to improve the accuracy of numerical solutions. It is now widely recognized that geometric (or structure-preserving) integrators are advantageous compared to non-geometric integrators for DEs, especially for long time integration.Geometric integrators for conservative DEs have been proposed, analyzed, and investigated extensively in the literature. The motif of this thesis is to extend the idea of structure preservation to linearly damped DEs. More specifically, we develop, analyze, and implement geometric integrators for linearly damped ordinary and partial differential equations (ODEs and PDEs) that possess conformal invariants, which are qualitative properties that decay exponentially along any solution of the DE as the system evolves over time. In particular, we derive restrictions on the coefficient functions of exponential Runge-Kutta (ERK) numerical methods for preservation of certain conformal invariants of linearly damped ODEs. An important class of these methods is shown to preserve the damping rate of solutions of damped linear ODEs. Linearly stability and order of accuracy for some specific cases of ERK methods are investigated. Geometric integrators for PDEs are designed using structure-preserving ERK methods in space, time, or both. These integrators for PDEs are also shown to preserve additional structure in certain special cases. Numerical experiments illustrate higher order accuracy and structure preservation properties of various ERK based methods, demonstrating clear advantages over non-structure-preserving methods, as well as usefulness for solving a wide range of DEs.
Show less - Date Issued
- 2016
- Identifier
- CFE0006832, ucf:51763
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006832
- Title
- Novel Computational Methods for Integrated Circuit Reverse Engineering.
- Creator
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Meade, Travis, Zhang, Shaojie, Jin, Yier, Orooji, Ali, Zou, Changchun, Lin, Mingjie, University of Central Florida
- Abstract / Description
-
Production of Integrated Circuits (ICs) has been largely strengthened by globalization. System-on-chip providers are capable of utilizing many different providers which can be responsible for a single task. This horizontal structure drastically improves to time-to-market and reduces manufacturing cost. However, untrust of oversea foundries threatens to dismantle the complex economic model currently in place. Many Intellectual Property (IP) consumers become concerned over what potentially...
Show moreProduction of Integrated Circuits (ICs) has been largely strengthened by globalization. System-on-chip providers are capable of utilizing many different providers which can be responsible for a single task. This horizontal structure drastically improves to time-to-market and reduces manufacturing cost. However, untrust of oversea foundries threatens to dismantle the complex economic model currently in place. Many Intellectual Property (IP) consumers become concerned over what potentially malicious or unspecified logic might reside within their application. This logic which is inserted with the intention of causing harm to a consumer has been referred to as a Hardware Trojan (HT).To help IP consumers, researchers have looked into methods for finding HTs. Such methods tend to rely on high-level information relating to the circuit, which might not be accessible. There is a high possibility that IP is delivered in the gate or layout level. Some services and image processing methods can be leveraged to convert layout level information to gate-level, but such formats are incompatible with detection schemes that require hardware description language.By leveraging standard graph and dynamic programming algorithms a set of tools is developed that can help bridge the gap between gate-level netlist access and HT detection. To help in this endeavor this dissertation focuses on several problems associated with reverse engineering ICs. Logic signal identification is used to find malicious signals, and logic desynthesis is used to extract high level details.Each of the proposed method have their results analyzed for accuracy and runtime. It is found that method for finding logic tends to be the most difficult task, in part due to the degree of heuristic's inaccuracy. With minor improvements moderate sized ICs could have their high-level function recovered within minutes, which would allow for a trained eye or automated methods to more easily detect discrepancies within a circuit's design.
Show less - Date Issued
- 2017
- Identifier
- CFE0006896, ucf:51716
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006896
- Title
- Quality by Design Procedure for Continuous Pharmaceutical Manufacturing: An Integrated Flowsheet Model Approach.
- Creator
-
Vezina, Ashley, Elshennawy, Ahmad, Rabelo, Luis, Karwowski, Waldemar, University of Central Florida
- Abstract / Description
-
Pharmaceutical manufacturing is crucial to global healthcare and requires a higher, more consistent level of quality than any other industry. Yet, the traditional pharmaceutical batch manufacturing has remained largely unchanged in the last fifty years due to high R(&)D costs, shorter patent durations, and regulatory uncertainty. This has led regulatory bodies to promote modernization of manufacturing process to continuous pharmaceutical manufacturing (CPM) by introducing new methodologies...
Show morePharmaceutical manufacturing is crucial to global healthcare and requires a higher, more consistent level of quality than any other industry. Yet, the traditional pharmaceutical batch manufacturing has remained largely unchanged in the last fifty years due to high R(&)D costs, shorter patent durations, and regulatory uncertainty. This has led regulatory bodies to promote modernization of manufacturing process to continuous pharmaceutical manufacturing (CPM) by introducing new methodologies including quality by design, design space, and process analytical technology (PAT). This represents a shift away from the traditional pharmaceutical manufacturing way of thinking towards a risk based approach that promotes increased product and process knowledge through a data-rich environment. While both literature and regulatory bodies acknowledge the need for modernization, manufacturers have been slow to modernize due to uncertainty and lack of confidence in the applications of these methodologies. This paper aims to describe the current applications of QbD principles in literature and the current regulatory environment to identify gaps in literature through leveraging regulatory guidelines and CPM literature. To aid in closing the gap between QbD theory and QbD application, a QbD algorithm for CPM using an integrated flowsheet models is also developed and analyzed. This will help to increase manufacturing confidence in CPM by providing answers to questions about the CPM business case, applications of QbD tools, process validation and sensitivity, and process and equipment characteristics. An integrated flowsheet model will aid in the decision-making process and process optimization, breaking away from ex silico methods extensively covered in literature.
Show less - Date Issued
- 2017
- Identifier
- CFE0006923, ucf:51683
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006923
- Title
- Buidling Lax Integrable Variable-Coefficient Generalizations to Integrable PDEs and Exact Solutions to Nonlinear PDEs.
- Creator
-
Russo, Matthew, Choudhury, Sudipto, Moore, Brian, Schober, Constance, Christodoulides, Demetrios, University of Central Florida
- Abstract / Description
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This dissertation is composed of two parts. In Part I a technique based on extended Lax Pairs isfirst considered to derive variable-coefficient generalizations of various Lax-integrable NLPDE hierarchies recently introduced in the literature. It is demonstrated that the technique yields Lax- or S-integrable nonlinear partial differential equations (PDEs) with both time- and space-dependent coefficients which are thus more general than almost all cases considered earlier via other methods such...
Show moreThis dissertation is composed of two parts. In Part I a technique based on extended Lax Pairs isfirst considered to derive variable-coefficient generalizations of various Lax-integrable NLPDE hierarchies recently introduced in the literature. It is demonstrated that the technique yields Lax- or S-integrable nonlinear partial differential equations (PDEs) with both time- and space-dependent coefficients which are thus more general than almost all cases considered earlier via other methods such as the Painleve Test, Bell Polynomials, and various similarity methods. However, this technique, although operationally effective, has the significant disadvantage that, for any integrable system with spatiotemporally varying coefficients, one must 'guess' a generalization of the structure of the known Lax Pair for the corresponding system with constant coefficients. Motivated by the somewhat arbitrary nature of the above procedure, we present a generalization to the well known Estabrook-Wahlquist prolongation technique which provides a systematic procedure for the derivation of the Lax representation. In order to obtain a nontrivial Lax representation we must impose differential constraints on the variable coefficients present in the nlpde. The resulting constraints determine a class of equations which represent generalizations to a previously known integrable constant coefficient nlpde. We demonstrate the effectiveness of this technique by deriving variable-coefficient generalizations to the nonlinear Schrodinger (NLS) equation, derivative NLS equation, PT-symmetric NLS, fifth-order KdV, and three equations in the MKdV hierarchy. In Part II of this dissertation, we introduce three types of singular manifold methods which have been successfully used in the literature to derive exact solutions to many nonlinear PDEs extending over a wide range of applications. The singular manifold methods considered are: truncated Painleve analysis, Invariant Painleve analysis, and a generalized Hirota expansion method. We then consider the KdV and KP-II equations as instructive examples before using each method to derive nontrivial solutions to a microstructure PDE and two generalized Pochhammer-Chree equations.
Show less - Date Issued
- 2016
- Identifier
- CFE0006173, ucf:51144
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006173
- Title
- Moral Judgment Development of Student Nurses in an Associate Degree in Nursing Program.
- Creator
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Way, Graciela, Cintron Delgado, Rosa, Owens, J. Thomas, Olan, Elsie, Welch, Kerry, Cicotti, Cheryl, University of Central Florida
- Abstract / Description
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This study explored the correlation between the development of moral judgment and the variables of gender, age, primacy of religion, level of educational attainment, and year in the nursing program student nurses enrolled in an associate degree in nursing program who were concurrently enrolled in a bachelor degree in nursing program in the southern United States. A correlation was established with the dependent variable, or N2 index score, and the independent variable, primacy of religion. A...
Show moreThis study explored the correlation between the development of moral judgment and the variables of gender, age, primacy of religion, level of educational attainment, and year in the nursing program student nurses enrolled in an associate degree in nursing program who were concurrently enrolled in a bachelor degree in nursing program in the southern United States. A correlation was established with the dependent variable, or N2 index score, and the independent variable, primacy of religion. A negative correlation between the N2 index was established in students who believed that religion exerted a great influence on their lives while a positive correlation was established between the N2 index score and students who believed that religion exerted no influence on their lives. One conclusion reached was that the freshman class had a higher number of respondents who did not feel that religion was important in their lives with higher N2 index scores and a larger number of students in the Postconventional Schema of Moral Judgment. Regarding recommendations, it was suggested that ethical instruction needs to move beyond merely teaching students' ethical theories and shift towards instruction in situationally-dependent, context-driven, real-world management of ethical predicaments in practice.
Show less - Date Issued
- 2016
- Identifier
- CFE0006195, ucf:51092
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006195
- Title
- Ethical Decision-Making in Higher Education: A sociological examination of graduate students' understanding of appropriate academic sharing.
- Creator
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Parham, Jennifer, Boote, David, Biraimah, Karen, Vitale, Thomas, Owens, Tom, University of Central Florida
- Abstract / Description
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Most prior research and scholarship views cheating as an individual failing rather than a sociological or organizational phenomenon. The purpose of this study was to identify the challenges students face in graduate education and the factors that affect ethical beliefs towards academic dishonesty. This study used a mixed method research approach including an online survey with approximately 1,250 responses from graduate students representing each of UCF's colleges and fifteen interviews with...
Show moreMost prior research and scholarship views cheating as an individual failing rather than a sociological or organizational phenomenon. The purpose of this study was to identify the challenges students face in graduate education and the factors that affect ethical beliefs towards academic dishonesty. This study used a mixed method research approach including an online survey with approximately 1,250 responses from graduate students representing each of UCF's colleges and fifteen interviews with students in fourteen different disciplines. Results of the online survey indicated no significant differences between international and domestic students. Survey and interview data indicate that graduate students' perceptions of the perceived norms and expectations related to academic honesty are impacted by the culture of the academic program. Analyzing these data through three sociological theories of deviance (-) anomie, labeling, and rational choice (-) shows that graduate students' understanding of appropriate academic behavior depends on their academic socialization. The data also reveal that graduate students struggle with subtleties of cheating, such as misrepresentation or (")fudging(") of data. Especially for the doctoral students in the sample, their views were highly influenced by viewing themselves as teachers and independent researchers. This sociological analysis emphasizes the role of culture in graduate programs and students' socialization into those cultures. This doctoral dissertation also provides a deeper understanding of the social and organizational factors affecting graduate students and re-frames students' perspectives on appropriate academic behavior.
Show less - Date Issued
- 2014
- Identifier
- CFE0005394, ucf:50452
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005394
- Title
- INTEGRAL PROJECTION MODELS REVEAL INTERACTIVE EFFECTS OF BIOTIC FACTORS AND DISTURBANCE ON PLANT DEMOGRAPHY.
- Creator
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Tye, Matthew, Quintana-Ascencio, Pedro, Fauth, John, Nevai, Andrew, Menges, Eric, University of Central Florida
- Abstract / Description
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Understanding factors limiting population growth is crucial to evaluating species persistence in changing environments. I used Integral Projection Models (IPMs) to elucidate the role of biotic interactions and disturbance on population growth rate in two plants: Helianthemum squamatum, a perennial endemic to gypsum habitats in central Spain, and Liatris ohlingerae, a long-lived perennial endemic to the Lake Wales Ridge of central Florida. In H. squamatum, there was a strong positive effect of...
Show moreUnderstanding factors limiting population growth is crucial to evaluating species persistence in changing environments. I used Integral Projection Models (IPMs) to elucidate the role of biotic interactions and disturbance on population growth rate in two plants: Helianthemum squamatum, a perennial endemic to gypsum habitats in central Spain, and Liatris ohlingerae, a long-lived perennial endemic to the Lake Wales Ridge of central Florida. In H. squamatum, there was a strong positive effect of trampling in the site with the highest plant density and moderate positive effects of seed addition in the site with the lowest plant density. Differences in treatment effectiveness between sites may represent a shift from seed to microsite limitation at increasing densities. Additionally, a distinct drop in population growth rate occurred in the hottest and driest year (2009-10). In Liatris ohlingerae, roadside populations had consistently higher population growth rates than scrub populations. A modest negative effect of time-since-fire was observed in plants that did not experience herbivory. Both habitat and time-since-fire showed distinct interactions with vertebrate herbivory, with herbivory increasing the difference in growth rate between habitats and decreasing the difference between time-since-fire classes. The direct effect of herbivory was negative in all environmental combinations except in long unburned populations. These results demonstrate the importance of considering environmental interactions when constructing population models, as well as the validity of using IPMs to assess interactions in species with differing life histories.
Show less - Date Issued
- 2014
- Identifier
- CFE0005271, ucf:50558
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005271
- Title
- RF Energy Harvesting for Implantable ICs with On-chip Antenna.
- Creator
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Liu, Yu-chun, Yuan, Jiann-Shiun, Gong, Xun, Jones, W, University of Central Florida
- Abstract / Description
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Nowadays, as aging population increasing yearly, the health care technologies for elder people who commonly have high blood pressure or Glaucoma issues have attracted much attention. In order to care of those people, implantable integrated circuits (ICs) in human body are the direct solution to have 24/7 days monitoring with real-time data for diagnosis by patients themselves or doctors. However, due to the small size requirement for the implanted ICs located in human organs, it's quite...
Show moreNowadays, as aging population increasing yearly, the health care technologies for elder people who commonly have high blood pressure or Glaucoma issues have attracted much attention. In order to care of those people, implantable integrated circuits (ICs) in human body are the direct solution to have 24/7 days monitoring with real-time data for diagnosis by patients themselves or doctors. However, due to the small size requirement for the implanted ICs located in human organs, it's quite challenging to integrate with transmitting and receiving antenna in a single chip, especially operating in 5.8-GHz ISM band. This research proposes a new idea to solve the issue of integrating an on-chip antenna with implanted ICs. By adding an additional dielectric substrate upon the layer of silicon oxide in CMOS technology, utilizing the metal-6, it can form an extremely compact 3D-structure on-chip antenna which is able to be placed in human eye, heart or even in a few mm-diameter vessels. The proposed 3D on-chip antenna is only 1(&)#215;1(&)#215;2.8 mm3 with -10 dB gain and 10% efficiency, which has capability to communicate at least within 5 cm distance. The entire implanted battery-less wireless system has also been developed in this research. A designed 30% efficiency Native NMOS rectifier could generate 1 V and 1 mA to supply the designed low power transmitter including voltage-controlled oscillator (VCO) and power amplifier (PA). The entire system performance is well evaluated by link budget analysis and the simulation result demonstrates the possibility and feasibility of future on-demand easy-to-design implantable SoC.
Show less - Date Issued
- 2014
- Identifier
- CFE0005202, ucf:50652
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005202
- Title
- An Agile Roadmap for Live, Virtual and Constructive-Integrating Training Architecture (LVC-ITA): A Case Study Using a Component based Integrated Simulation Engine.
- Creator
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Park, Tae Woong, Lee, Gene, Rabelo, Luis, Elshennawy, Ahmad, Kincaid, John, University of Central Florida
- 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.
Show less - Date Issued
- 2015
- Identifier
- CFE0005682, ucf:52867
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005682
- Title
- An Investigation of State College to University Transfer Students' Sense of Belonging.
- Creator
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Brady, Claire, Taylor, Rosemarye, Baldwin, Lee, Doherty, Walter, Cavanaugh, Pam, University of Central Florida
- Abstract / Description
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The purpose of this mixed methods study was to examine the sense of belonging of state college transfer students who enroll at a large research-intensive university through structured and unstructured transfer pathways using the Sense of Belonging Instrument (SBI; Hoffman, Richmond, Morrow, (&) Solomon, 2002). The SBI includes five subscales (Peer Support, Faculty Support, Classroom Comfort, Isolation, and Empathetic Faculty Understanding). To date, no systematic investigation has considered...
Show moreThe purpose of this mixed methods study was to examine the sense of belonging of state college transfer students who enroll at a large research-intensive university through structured and unstructured transfer pathways using the Sense of Belonging Instrument (SBI; Hoffman, Richmond, Morrow, (&) Solomon, 2002). The SBI includes five subscales (Peer Support, Faculty Support, Classroom Comfort, Isolation, and Empathetic Faculty Understanding). To date, no systematic investigation has considered the construct of belonging with this population or transfer pathway. The findings from this study (n = 54) found a positive statistically significant correlation between Peer Support and Isolation (r(52) =.801, p = .000) and a statistically significant difference between the mean values of Empathetic Faculty Understanding between the structured and unstructured pathways (p = 0.027). This study showed that structured transfer pathway student sense of belonging was grounded in the classroom experience, empathetic faculty, and faculty support. Unstructured transfer pathway student sense of belonging was grounded in peer relationships, the classroom experience, and empathetic faculty. First generation participants were more likely to perceive isolation than non-first generation participants and structured pathway participants were more likely to perceive faculty empathetic understanding than unstructured pathway participants. There were also differences in the qualitative data between the pathway groups, including differing perceptions of faculty care and empathy, peer engagement, and the role of Advisors and online support systems in the transfer experience. The data and findings presented in this study show that the academic experience in the classroom and the perception of empathetic faculty are central to state college transfer student experience and contributes to transfer student sense of belonging.
Show less - Date Issued
- 2017
- Identifier
- CFE0006569, ucf:51332
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006569
