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- Title
- THE POWER IN MULTIPLYING: GROWTH IN NEW RELIGIOUS MOVEMENTS.
- Creator
-
Wrobel, Nicole, Gleig, Ann, University of Central Florida
- Abstract / Description
-
Starting in November of 2016, a documentary series aired on the original network A[and]E where it continues to capture the attention of thousands of viewers in America. Scientology: The Aftermath, starring the well-known King of Queens and Dancing with the Stars actress Leah Remini and former senior executive of the church of Scientology International and Sea Organization Mike Rinder, aim to reveal the "truth" that hides behind the church of Scientology. The show interviews ex-practitioners...
Show moreStarting in November of 2016, a documentary series aired on the original network A[and]E where it continues to capture the attention of thousands of viewers in America. Scientology: The Aftermath, starring the well-known King of Queens and Dancing with the Stars actress Leah Remini and former senior executive of the church of Scientology International and Sea Organization Mike Rinder, aim to reveal the "truth" that hides behind the church of Scientology. The show interviews ex-practitioners who claim their lives have been deeply impacted by the church and who want to assist in revealing the shocking stories of abuse and harassment the church tries to keep secret. The goal of the show, in short, is to not only share the "real" face of Scientology to the public, but to also reach out and assist people who have been affected personally by the church; some have lost their family and friends while others have been followed or monitored by church members. A simple Google search on Scientology brings up multiple news headlines on the church being labeled as a "cult" and "criminal" while magazines in the lines of grocery stores display the downfall on the marriage of Tom Cruise and Katie Holmes due to the intensity of the Church of Scientology. Yet Scientology isn't alone in receiving negative attention from the media. Christian Science has been accused of depriving the ill of needed medical attention which has led to some members becoming severely ill and dying in some cases. Most of these cases are children that were deprived of needed medical assistance due to their parents' religious views. Religious Studies scholar, Mary Bednarowski, adds that due to these circumstances, Christian Science has long experienced harsh criticism. With families and anti-cult movements protesting in the streets, ads, books, and magazines displaying their opposition, and the media labeling these movements as "dangerous", why would people join and remain in these New Religious Movements? What is it that makes these religious movements alluring and what are their adherents benefiting from them?
Show less - Date Issued
- 2018
- Identifier
- CFH2000325, ucf:45732
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH2000325
- Title
- EVALUATING THE IMPACT OF OOCEA'S DYMANIC MESSAGE SIGNS (DMS) ON TRAVELERS' EXPERIENCE USING A PRE AND POST-DEPLOYMENT SURVEY.
- Creator
-
Flick, Jason, Al-Deek, Haitham, University of Central Florida
- Abstract / Description
-
The purpose of this thesis was to evaluate the impact of dynamic message signs (DMS) on the Orlando-Orange County Expressway Authority (OOCEA) toll road network using a Pre and Post-Deployment DMS Survey (henceforth referred to as "pre and post-deployment survey") analysis. DMS are electronic traffic signs used on roadways to give travelers information about travel times, traffic congestion, accidents, disabled vehicles, AMBER alerts, and special events. The particular DMS referred to in this...
Show moreThe purpose of this thesis was to evaluate the impact of dynamic message signs (DMS) on the Orlando-Orange County Expressway Authority (OOCEA) toll road network using a Pre and Post-Deployment DMS Survey (henceforth referred to as "pre and post-deployment survey") analysis. DMS are electronic traffic signs used on roadways to give travelers information about travel times, traffic congestion, accidents, disabled vehicles, AMBER alerts, and special events. The particular DMS referred to in this study are large rectangular signs installed over the travel lanes and these are not the portable trailer mount signs. The OOCEA have been working over the past two years to add several fixed DMS on their toll road network. At the time of the pre-deployment survey, only one DMS was installed on the OOCEA toll road network. At the time of the post-deployment survey, a total of 30 DMS were up and running on the OOCEA toll road network. Since most of the travelers on the OOCEA toll roads are from Orange, Osceola, and Seminole counties, this study was limited to these counties. This thesis documents the results and comparisons between the pre and post-deployment survey analysis. The instrument used to analyze the travelers' perception of DMS was a survey that utilized computer aided telephone interviews. The pre-deployment survey was conducted during early November of 2006, and the post-deployment survey was conducted during the month of May, 2008. Questions pertaining to the acknowledgement of DMS on the OOCEA toll roads, satisfaction with travel information provided on the network, formatting of the messages, satisfaction with different types of messages, diversion questions (Revealed and Stated preferences), and classification/socioeconomic questions (such as age, education, most traveled toll road, county of residence, and length of residency) were asked to the respondents. The results of both the pre and post-deployment surveys are discussed in this thesis, but it should be noted that the more telling results are those of the post-deployment survey. The results of the post-deployment survey show the complete picture of the impact of DMS on travelers' experience on the OOCEA toll road network. The pre-deployment results are included to show an increase or decrease in certain aspects of travel experience with relation to DMS. The results of the pre-deployment analysis showed that 54.4% of the OOCEA travelers recalled seeing DMS on the network, while a total of 63.93% of the OOCEA travelers recalled seeing DMS during the post-deployment analysis. This showed an increase of almost 10% between the two surveys demonstrating the people are becoming more aware of DMS on the OOCEA toll road network. The respondents commonly agreed that the DMS were helpful for providing information about hazardous conditions, and that the DMS are easy to read. Also, upon further research it was found that between the pre and post-deployment surveys the travelers' satisfaction with special event information provided on DMS and travel time accuracy on DMS increased significantly. With respect to formatting of the DMS, the following methods were preferred by the majority of respondents in both the pre and post-deployment surveys: • Steady Message as a default DMS message format • Flashing Message for abnormal traffic information (94% of respondents would like to be notified of abnormal traffic information) • State road number to show which roadway (for Colonial – SR 50, Semoran – SR 436 and Alafaya – SR 434) • "I-Drive" is a good abbreviation for International Drive • If the distance to the international airport is shown on a DMS it thought to be the distance to the airport exit The results from the binary logit model for "satisfaction with travel information provided on OOCEA toll road network" displayed the significant variables that explained the likelihood of the traveler being satisfied. This satisfaction model was based on respondents who showed a prior knowledge of DMS on OOCEA toll roads. With the use of a pooled model (satisfaction model with a total of 1775 responses – 816 from pre-deployment and 959 from post-deployment), it was shown that there was no statistical change between the pre and post-deployment satisfaction based on variables thought to be theoretically relevant. The results from the comparison between the pre and post-deployment satisfaction models showed that many of the coefficients of the variables showed a significant change. Although some of the variables were statistically insignificant in one of the two survey model results: Either the pre or post-deployment model, it was still shown that every variable was significant in at least one of the two models. The coefficient for the variable corresponding to DMS accuracy showed a significantly lower value in the post-deployment model. The coefficient for the variable "DMS was helpful for providing special event information" showed a significantly higher value in the post-deployment model. The final post-deployment diversion model was based on a total of 732 responses who answered that they had experienced congestion in the past 6 months. Based on this final post-deployment diversion model, travelers who had stated that their most frequently traveled toll road was either SR 408 or SR 417 were more likely to divert. Also, travelers who stated that they would divert in the case of abnormal travel times displayed on DMS or stated that a DMS influenced their response to congestion showed a higher likelihood of diversion. These two variables were added between the pre and post-deployment surveys. It is also beneficial to note that travelers who stated they would divert in a fictitious congestion situation of at least 30 minutes of delay were more likely to divert. This shows that they do not contradict themselves in their responses to Revealed Preference and Stated Preference diversion situations. Based on a comparison between pre and post-deployment models containing similar variables, commuters were more likely to stay on the toll road everything else being equal to the base case. Also, it was shown that in the post-deployment model the respondents traveling on SR 408 and SR 417 were more likely to divert, but in the pre-deployment model only the respondents traveling on SR 408 were more likely to divert. This is an expected result since during the pre-deployment survey only one DMS was located on SR 408, and during the post-deployment survey there were DMS located on all toll roads. Also, an interesting result to be noted is that in the post-deployment survey, commuters who paid tolls with E-pass were more likely to stay on the toll road than commuters who paid tolls with cash. The implications for implementation of these results are discussed in this thesis. DMS should be formatted as a flashing message for abnormal traffic situations and the state road number should be used to identify a roadway. DMS messages should pertain to information on roadway hazards when necessary because it was found that travelers find it important to be informed on events that are related to their personal safety. The travel time accuracy on DMS was shown to be significant for traveler information satisfaction because if the travelers observe inaccurate travel times on DMS, they may not trust the validity of future messages. Finally, it is important to meet the travelers' preferences and concerns for DMS.
Show less - Date Issued
- 2008
- Identifier
- CFE0002295, ucf:47862
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002295
- Title
- A Grounded Theory Survey Study of Teachers Perception Perpetuating the Deficit Narrative About Marginalized Students of Color.
- Creator
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Austin, Cavel, Olan, Elsie, Hewitt, Randall, Jeanpierre, Bobby, Puig, Enrique, University of Central Florida
- Abstract / Description
-
The deficit narrative about marginalized students of color attributes their failure in school to some nature of innate cognitive deficiency, cultural, social, and familial dysfunctions among other schools of thoughts. The purpose of this grounded theory study is to provide a rich description about this phenomenon and to propose theoretical pedagogical adjustments in the classroom as it relates to educating students of color. The study applies Charmaz (2014) Constructivist approach to grounded...
Show moreThe deficit narrative about marginalized students of color attributes their failure in school to some nature of innate cognitive deficiency, cultural, social, and familial dysfunctions among other schools of thoughts. The purpose of this grounded theory study is to provide a rich description about this phenomenon and to propose theoretical pedagogical adjustments in the classroom as it relates to educating students of color. The study applies Charmaz (2014) Constructivist approach to grounded theory methods to examine the following research questions: (RQ1) How do teachers' narratives about students of color depict their teaching experiences and (RQ2) How do teachers' narratives about students of color inform students learning? Two overarching themes emerged in this study: practicing color blindness impacts cultural responsiveness while perpetuate deficit thinking, and understanding cultural background stimulates sensitivity when designing curriculum for students of color. The findings of this research demonstrate teachers' deficit thinking depicts their pedagogical practices and informs students learning. The research has both practical and theoretical implications for dispelling the deficit thinking regarding students of color.
Show less - Date Issued
- 2019
- Identifier
- CFE0007779, ucf:52339
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007779
- Title
- A Digital Media Exploration of the Federal Writers' Project's Folk Song Collecting Expeditions in Depression Era Florida.
- Creator
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Baker, Holly, Cassanello, Robert, French, Scot, Walker, Ezekiel, University of Central Florida
- Abstract / Description
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This digital thesis project examines the folk song collecting expeditions of the Federal Writers' Project (FWP) in Florida between 1935 and 1942. The FWP carried out numerous folk music collecting expeditions in Florida through the Works Progress Administration. Folklorists such as Zora Neale Hurston, Alan Lomax, and Stetson Kennedy led the expeditions and traveled throughout Florida to record blues, (")jook(") songs, work songs, and traditional music from African American, Cuban, Czech,...
Show moreThis digital thesis project examines the folk song collecting expeditions of the Federal Writers' Project (FWP) in Florida between 1935 and 1942. The FWP carried out numerous folk music collecting expeditions in Florida through the Works Progress Administration. Folklorists such as Zora Neale Hurston, Alan Lomax, and Stetson Kennedy led the expeditions and traveled throughout Florida to record blues, (")jook(") songs, work songs, and traditional music from African American, Cuban, Czech, Greek, Minorcan, Seminole, and Slavic communities. While romantic notions of nationalism in the 1930s often promoted homogenization, the FWP emphasized inclusiveness and highlighted cultural diversity. The FWP's approach challenged popular concepts concerning the homogeneousness of American culture and identity. Their recordings indicate that Florida was a patchwork of varied cultures. Yet, Florida's diversity is not adequately highlighted in popular history. Historians often see Florida history through the eyes of the mythologized (")Florida Cracker("), the Celtic pioneer who settled in Florida in the eighteenth century, but the Cracker perspective represents but a square in the patchwork quilt that makes up Florida's cultural history. An exploration of the FWP folk song recordings brings Florida's diversity to the forefront and increases the public's understanding of the state's cultural variety. The project includes a podcast series that features stories about the FWP expeditions, the folklorists, the performers, and the music. It also includes an interactive exhibit that is currently a work in progress. Source materials derived from open-access public archives create an immersive, interactive learning experience.
Show less - Date Issued
- 2018
- Identifier
- CFE0007153, ucf:52321
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007153
- Title
- Structural and Functional Studies of Glycine Riboswitches and Development of Fab Chaperone Assisted RNA Crystallography.
- Creator
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Sherman, Eileen, Ye, Jingdong, Kolpashchikov, Dmitry, Koculi, Eda, Harper, James, Self, William, University of Central Florida
- Abstract / Description
-
The glycine riboswitch is a structured RNA found upstream of genes in mRNA transcripts in many bacteria, functioning as a biofeedback gene regulator. Upon binding glycine, a complete RNA transcript including gene sequences is transcribed, effectively turning on gene expression. In an effort to understand the intricacies of its functioning, many mutants of the riboswitch were made and characterized during Ph. D. work, resulting in discovery of a P0 duplex/kink-turn motif involving a few...
Show moreThe glycine riboswitch is a structured RNA found upstream of genes in mRNA transcripts in many bacteria, functioning as a biofeedback gene regulator. Upon binding glycine, a complete RNA transcript including gene sequences is transcribed, effectively turning on gene expression. In an effort to understand the intricacies of its functioning, many mutants of the riboswitch were made and characterized during Ph. D. work, resulting in discovery of a P0 duplex/kink-turn motif involving a few nucleotides upstream of the established glycine riboswitch sequence which changed its ligand binding characteristics (Chapter 1). Previously, the two aptamers of the riboswitch were thought to cooperatively bind glycine, but with the inclusion of this leader sequence which forms a kink turn motif with the linker between the two aptamers, glycine binding in one aptamer no longer requires glycine binding in the other. Furthermore, the Kd from three species tested are now a similar, lower value of about 5 (&)#181;M, indicating authenticity of this new consensus sequence. Glycine binding and interaptamer interaction both enhanced one another in trans aptamer assays. Another discovery from this was a shortened construct including all of aptamer II but only part of aptamer I in which a few specific nucleotides prevented glycine binding in aptamer II (Chapter 2). This may provide insight into the nature of interaptamer interactions in the full switch; addition of an oligonucleotide complimentary to these nucleotides restored glycine binding ability to aptamer II. With future development, this could also be a useful molecular biology tool, using two signals, glycine and an oligonucleotide, to allow gene expression.To precisely understand how any macromolecule functions, a 3D structure, obtainable by x-ray crystallography, is vital. A new technique to accomplish that for RNA, precedented in the protein world, is Fab chaperoned crystallography, which has advantages compared to RNA alone. A phage displayed library of Fabs with reduced codon diversity designed for RNA was created, the YSGR Min library (Chapter 3). Its Fabs had specificities and affinities equal to or greater than previous libraries which were originally created for phage displayed selection against proteins. Fab chaperoned RNA crystallography is currently in progress for the glycine riboswitch; the best resolution thus far is 5.3 (&)#197; (Chapter 4). In addition to providing molecular insight into its gene regulation mechanism, a structure of the glycine riboswitch could be applied for use in structure based drug design of novel antibiotics targeting the riboswitch to disrupt important downstream carbon cycle genes in pathogenic bacteria.
Show less - Date Issued
- 2014
- Identifier
- CFE0005549, ucf:50285
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005549
- Title
- The African Puzzle: A Study of Democratic Backsliding in Sub Saharan Africa.
- Creator
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Rice, Ailbhe, Powell, Jonathan, Boutton, Andrew, Bledsoe, Robert, University of Central Florida
- Abstract / Description
-
The following study examines the future of democratization and the apparent trend towards autocratization within the context of democratic backsliding in Sub-Saharan Africa. Initially, the findings indicate that regionally, backsliding is not acting fundamentally different in Sub-Saharan Africa when compared to other regions. The analysis finds that regime duration and civil conflict are both significant when it comes to the study of democratic backsliding. The variable for the prior military...
Show moreThe following study examines the future of democratization and the apparent trend towards autocratization within the context of democratic backsliding in Sub-Saharan Africa. Initially, the findings indicate that regionally, backsliding is not acting fundamentally different in Sub-Saharan Africa when compared to other regions. The analysis finds that regime duration and civil conflict are both significant when it comes to the study of democratic backsliding. The variable for the prior military regime's is extremely significant in all of the models and is, therefore, a strong indicator of backsliding in Africa. The chief takeaway from the study is in the variable for economic growth and finds that as economic growth increases the likelihood of backsliding decreases. This variable is negative and significant for all of the models, but if Africa is taken out of the analysis the trend ultimately disappears, which indicates that Africa is potentially driving this trend of economic growth and backsliding.
Show less - Date Issued
- 2018
- Identifier
- CFE0007360, ucf:52080
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007360
- Title
- Jail Mental Health Innovations: Factors Influencing Mental Health Services Innovations for Jails.
- Creator
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Clayton, Orville, Wan, Thomas, Anderson, Kim, Winton, Mark, Zhang, Ning, University of Central Florida
- Abstract / Description
-
ABSTRACTThe U.S. is recognized for uniquely high incarceration rates. Over recent decades, there has been a concurrent dramatic increase of jail detainees with mental disorders. Provision of adequate mental health services for jail inmates is constitutionally mandated, and has legal, ethical, quality of care, and fiscal implications for jails, families, communities, and detainees. Significant variation exists in the provision of mental health services across jails, and increased understanding...
Show moreABSTRACTThe U.S. is recognized for uniquely high incarceration rates. Over recent decades, there has been a concurrent dramatic increase of jail detainees with mental disorders. Provision of adequate mental health services for jail inmates is constitutionally mandated, and has legal, ethical, quality of care, and fiscal implications for jails, families, communities, and detainees. Significant variation exists in the provision of mental health services across jails, and increased understanding of the factors that influence the adoption of such services may help guide jails to implement beneficial services, and ensure that such services reflect, reflect quality standards. This study used a mixed methods strategy to examine the influence of theoretically determined variables on the adoption of jail mental health services, and the quality assessment of such services. Data was gathered by survey instrumentation, secondary data review, and in-depth interviews with jail leaders. The study found that isomorphism has a significant effect on the structural adequacy of jail mental health services, innovation characteristics have a negligible relationship to structural adequacy and process integrity, structural adequacy mediates the effects of isomorphism on process integrity, and jail size has a significant effect on structural adequacy. This study advances the knowledge base in its specification of the roles of internal, external, and demographic factors in the adoption of jail mental health services, and in the testing and application of Donabedian's healthcare model to assess the quality of such services.
Show less - Date Issued
- 2017
- Identifier
- CFE0006866, ucf:51755
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006866
- Title
- Hmong Americans in Higher Education: Exploring their Sense of Belongingness and the Concept of the American Dream.
- Creator
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Daugherty, Janet, Cintron Delgado, Rosa, Owens, J. Thomas, Cox, Thomas, Molina, Olga, University of Central Florida
- Abstract / Description
-
I conducted this study to examine Hmong American college students' perspectives on sense of belongingness and their idea on the American Dream. The college experience can serve as a precursor to improving the social and economic situation of the Hmong students when aligned with the personal desire to gain upward mobility and motivation to circumvent social and academic inconsistencies.The methodology of the study was designed for one-on-one phenomenological informal interviews with Hmong...
Show moreI conducted this study to examine Hmong American college students' perspectives on sense of belongingness and their idea on the American Dream. The college experience can serve as a precursor to improving the social and economic situation of the Hmong students when aligned with the personal desire to gain upward mobility and motivation to circumvent social and academic inconsistencies.The methodology of the study was designed for one-on-one phenomenological informal interviews with Hmong American college upper-classmen using a two-part interview protocol to elicit demographic and experiential information. Moustakas' approach to the analysis of data provided guidelines to review individual transcripts and to group, remove, cluster, and thematize lived experiences.The findings of this study indicated that Hmong college students: (a) enrolled out of obedience to the parents, especially their fathers, regardless of the educational level of the parents and (b) thrived when authority figures on campus reached out to help their humble situation. . . it not only made them belong to the campus family but it strengthened their self-esteem.
Show less - Date Issued
- 2015
- Identifier
- CFE0005596, ucf:50250
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005596
- Title
- A Case Study Exploring the Relationship between Culturally Responsive Teaching and a Mathematical Practice of the Common Core State Standards.
- Creator
-
Howse, Tashana, Dixon, Juli, Haciomeroglu, Erhan, Andreasen, Janet, Adams, Thomasenia, University of Central Florida
- Abstract / Description
-
This collective case study explores the nature of the relationship between teachers' use of culturally responsive teaching (CRT) practices and students' engagement in constructing viable arguments and critiquing the reasoning of others (SMP3). This study was informed by the Common Core State Standards Initiative related to developing mathematically proficient students through the use of student engagement practices consistent with the standards for mathematical practice. As a means to support...
Show moreThis collective case study explores the nature of the relationship between teachers' use of culturally responsive teaching (CRT) practices and students' engagement in constructing viable arguments and critiquing the reasoning of others (SMP3). This study was informed by the Common Core State Standards Initiative related to developing mathematically proficient students through the use of student engagement practices consistent with the standards for mathematical practice. As a means to support teachers' facilitating specific student engagement practices, professional development was provided. This study is situated in the growing body of research associated with student engagement and cultural identity. The case of two teachers was defined from interviews, classroom observations, journal prompts, and student artifacts. Data was collected before, during, and after professional development following a cross-case analysis. Four themes emerged: (a) shift in teacher practice; (b) depth and breadth of the knowledge of culturally responsive teaching and standard for mathematical practice three; (c) teacher reflection and reception; and (d) classroom management. The findings suggest that the shift in teacher practice can be supported by professional development focused on reflective practice. This shift is impacted by classroom management and teachers' depth and breadth of their knowledge of CRT and SMP3.
Show less - Date Issued
- 2013
- Identifier
- CFE0005005, ucf:50009
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005005
- Title
- EFFECTIVE SCHOOL CHARACTERISTICS AND STUDENT ACHIEVEMENT CORRELATES AS PERCEIVED BY TEACHERS IN AMERICAN STYLE INTERNATIONAL SCHOOLS.
- Creator
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Doran, James, Allen, Kay, University of Central Florida
- Abstract / Description
-
The purpose of this study is to investigate the relationships between effective school characteristics and norm referenced standardized test scores in American-style international schools. In contrast to schools in traditional effective schools research, international schools typically have middle to high SES families, and display average to above average achievement. Eleven effective school characteristics were identified and correlated with standardized test scores for grades 4, 6, and 8...
Show moreThe purpose of this study is to investigate the relationships between effective school characteristics and norm referenced standardized test scores in American-style international schools. In contrast to schools in traditional effective schools research, international schools typically have middle to high SES families, and display average to above average achievement. Eleven effective school characteristics were identified and correlated with standardized test scores for grades 4, 6, and 8 and high school SAT scores. Data was gathered from an online teacher questionnaire designed for this study. All eleven characteristics were present in high performing international schools while frequent analysis of student progress, high academic expectations and positive school environment were more prominent. Positive school environment, high academic expectations, strong instructional leadership and cultural diversity were chosen as important characteristics of an effective international school. Learning time is maximized was the only characteristic that was significantly correlated with achievement and only in grades 4, 6 and 8. There was no statistically significant relationship found between norm referenced test scores and the aggregate effective school characteristics score.
Show less - Date Issued
- 2004
- Identifier
- CFE0000245, ucf:46244
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000245
- Title
- Adaptive Architectural Strategies for Resilient Energy-Aware Computing.
- Creator
-
Ashraf, Rizwan, DeMara, Ronald, Lin, Mingjie, Wang, Jun, Jha, Sumit, Johnson, Mark, University of Central Florida
- Abstract / Description
-
Reconfigurable logic or Field-Programmable Gate Array (FPGA) devices have the ability to dynamically adapt the computational circuit based on user-specified or operating-condition requirements. Such hardware platforms are utilized in this dissertation to develop adaptive techniques for achieving reliable and sustainable operation while autonomously meeting these requirements. In particular, the properties of resource uniformity and in-field reconfiguration via on-chip processors are exploited...
Show moreReconfigurable logic or Field-Programmable Gate Array (FPGA) devices have the ability to dynamically adapt the computational circuit based on user-specified or operating-condition requirements. Such hardware platforms are utilized in this dissertation to develop adaptive techniques for achieving reliable and sustainable operation while autonomously meeting these requirements. In particular, the properties of resource uniformity and in-field reconfiguration via on-chip processors are exploited to implement Evolvable Hardware (EHW). EHW utilize genetic algorithms to realize logic circuits at runtime, as directed by the objective function. However, the size of problems solved using EHW as compared with traditional approaches has been limited to relatively compact circuits. This is due to the increase in complexity of the genetic algorithm with increase in circuit size. To address this research challenge of scalability, the Netlist-Driven Evolutionary Refurbishment (NDER) technique was designed and implemented herein to enable on-the-fly permanent fault mitigation in FPGA circuits. NDER has been shown to achieve refurbishment of relatively large sized benchmark circuits as compared to related works. Additionally, Design Diversity (DD) techniques which are used to aid such evolutionary refurbishment techniques are also proposed and the efficacy of various DD techniques is quantified and evaluated.Similarly, there exists a growing need for adaptable logic datapaths in custom-designed nanometer-scale ICs, for ensuring operational reliability in the presence of Process, Voltage, and Temperature (PVT) and, transistor-aging variations owing to decreased feature sizes for electronic devices. Without such adaptability, excessive design guardbands are required to maintain the desired integration and performance levels. To address these challenges, the circuit-level technique of Self-Recovery Enabled Logic (SREL) was designed herein. At design-time, vulnerable portions of the circuit identified using conventional Electronic Design Automation tools are replicated to provide post-fabrication adaptability via intelligent techniques. In-situ timing sensors are utilized in a feedback loop to activate suitable datapaths based on current conditions that optimize performance and energy consumption. Primarily, SREL is able to mitigate the timing degradations caused due to transistor aging effects in sub-micron devices by reducing the stress induced on active elements by utilizing power-gating. As a result, fewer guardbands need to be included to achieve comparable performance levels which leads to considerable energy savings over the operational lifetime.The need for energy-efficient operation in current computing systems has given rise to Near-Threshold Computing as opposed to the conventional approach of operating devices at nominal voltage. In particular, the goal of exascale computing initiative in High Performance Computing (HPC) is to achieve 1 EFLOPS under the power budget of 20MW. However, it comes at the cost of increased reliability concerns, such as the increase in performance variations and soft errors. This has given rise to increased resiliency requirements for HPC applications in terms of ensuring functionality within given error thresholds while operating at lower voltages. My dissertation research devised techniques and tools to quantify the effects of radiation-induced transient faults in distributed applications on large-scale systems. A combination of compiler-level code transformation and instrumentation are employed for runtime monitoring to assess the speed and depth of application state corruption as a result of fault injection. Finally, fault propagation models are derived for each HPC application that can be used to estimate the number of corrupted memory locations at runtime. Additionally, the tradeoffs between performance and vulnerability and the causal relations between compiler optimization and application vulnerability are investigated.
Show less - Date Issued
- 2015
- Identifier
- CFE0006206, ucf:52889
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006206
