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Title: INSTRUMENTED NANOINDENTATION STUDIES OF DEFORMATION IN SHAPE MEMORY ALLOYS.
Creator: Rajagopalan, Sudhir, Vaidyanathan, Rajan, University of Central Florida
Abstract / Description: Near equi-atomic nickel titanium (NiTi) shape memory alloys (SMAs) are a class of materials characterized by their unique deformation behavior. In these alloys, deformation mechanisms such as mechanical twinning and stress induced phase transformation between a high symmetry phase (austenite) and a low symmetry phase (martensite) additionally occur and influence mechanical behavior and thus their functionality. Consequently, applications of SMAs usually call for precise phase transformation...
Show moreNear equi-atomic nickel titanium (NiTi) shape memory alloys (SMAs) are a class of materials characterized by their unique deformation behavior. In these alloys, deformation mechanisms such as mechanical twinning and stress induced phase transformation between a high symmetry phase (austenite) and a low symmetry phase (martensite) additionally occur and influence mechanical behavior and thus their functionality. Consequently, applications of SMAs usually call for precise phase transformation temperatures, which depend on the thermomechanical history and the composition of the alloy. Instrumented indentation, inherently a mechanical characterization technique for small sampling volumes, offers a cost effective means of empirically testing SMAs in the form of centimeter scaled buttons prior to large-scale production. Additionally, it is an effective probe for intricate SMA geometries (e.g., in medical stents, valves etc.), not immediately amenable to conventional mechanical testing. The objective of this work was to study the deformation behavior of NiTi SMAs using instrumented indentation. This involved devising compliance calibration techniques to account for instrument deformation and designing spherical diamond indenters. Substantial quantitative information related to the deformation behavior of the shape memory and superelastic NiTi was obtained for the first time, as opposed to existing qualitative indentation studies. For the case of shape memory NiTi, the elastic modulus of the B19' martensite prior to twinning was determined using spherical indentation to be about 101 GPa, which was comparable to the value from neutron diffraction and was substantially higher than typical values reported from extensometry (68 GPa in this case). Twinning at low stresses was observed from neutron diffraction measurements and was attributed to reducing the elastic modulus estimated by extensometry. The onset of predominantly elastic deformation of the twinned martensite was identified from the nanoindentation response and the elastic modulus of the twinned martensite was estimated to be about 17 GPa. Finite element modeling was used to validate the measurements. For the case of the superelastic NiTi, the elastic modulus of the parent austenite was estimated to be about 62 GPa. The onset of large-scale stress induced martensite transformation and its subsequent elastic deformation were identified from the nanoindentation response. The effect of cycling on the mechanical behavior of the NiTi specimen was studied by repeatedly indenting at the same location. An increase in the elastic modulus value for the austenite and a decrease in the associated hysteresis and residual depth after the initial few cycles followed by stabilization were observed. As for the case of shape memory NiTi, finite element modeling was used to validate the measurements. This work has initiated a methodology for the quantitative evaluation of shape memory and superelastic NiTi alloys with instrumented spherical indentation. The aforementioned results have immediate implications for optimizing thermomechanical processing parameters in prototype button melts and for the mechanical characterization of intricate SMA geometries (e.g., in medical stents, valves etc.) This work was made possible by grants from NASA (NAG3-2751) and NSF (CAREER DMR-0239512) to UCF.
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Date Issued: 2005
Identifier: CFE0000652, ucf:46502
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000652

Title: THE ACCOMPANIED EXPERIENCE AND THE AESTHETICS OF MEMORY.
Creator: Dickerson, Allyson, Harris, Christopher, University of Central Florida
Abstract / Description: For me, a memory is the thought of a feeling. Feeling, in this case, is the appreciable radiation of sensory emanating from all objects and persons in a given moment of time. "All thought, like all feeling, is a relationship between one human being and another human being or certain objects which form a part of his universe" (Astruc). Be it an instance of attraction to another person, a place, a creation, an object, or purely an aesthetic pleasure, said instance will become ingrained as a...
Show moreFor me, a memory is the thought of a feeling. Feeling, in this case, is the appreciable radiation of sensory emanating from all objects and persons in a given moment of time. "All thought, like all feeling, is a relationship between one human being and another human being or certain objects which form a part of his universe" (Astruc). Be it an instance of attraction to another person, a place, a creation, an object, or purely an aesthetic pleasure, said instance will become ingrained as a part of an aggregation of moment-to-moment experiences that form an individual's universe and lifetime of perceptions. Through film, I hope to give a visual tangibility for such feelings, a re-playable, and relatively more permanent, representation. It's a process similar to the way a headstone memorializes a life. A few words in stone could never measure up to the present time of actually living, but this is because they are not comparable. In much the same way, a synthesized montage of images cannot be compared to a memory, but should be used as way to experience the memory in a new way.
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Date Issued: 2014
Identifier: CFH0004613, ucf:45277
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004613

Title: BLANKETS OF MEMORY: SHORT STORIES.
Creator: Kubik, Kyle S, Telep, Peter, University of Central Florida
Abstract / Description: The collection of short stories presented in this thesis seeks to form a counter-narrative to the stigmas associated with mental illness and trauma through the portrayal of protagonists suffering from or affected by such issues. Individuals influenced by mental illness and/or trauma are not "others" deserving ostracization but fellow human beings searching for hope in a world too often touched by sorrow. The first three stories within this thesis address protagonists directly impacted by...
Show moreThe collection of short stories presented in this thesis seeks to form a counter-narrative to the stigmas associated with mental illness and trauma through the portrayal of protagonists suffering from or affected by such issues. Individuals influenced by mental illness and/or trauma are not "others" deserving ostracization but fellow human beings searching for hope in a world too often touched by sorrow. The first three stories within this thesis address protagonists directly impacted by mental illness. "Twin Magnolias" follows Maggie Briggins, an elderly woman battling both paranoia and Alzheimer's simultaneously in a search for reality. "Faberge" explores Candy Friedman's depression and relationship to her past as a ballerina. In "A Few Flowers to Hold," Leo Berns finds closure from a past filled with trauma and guilt through the connections his schizophrenia provides him. In contrast, the final two stories depict the lives of protagonists indirectly affected by mental illness. After the stillbirth of his daughter, Richard Glim finds hope in an unlikely place, a nursing home. Finally, the title piece of the collection explores and compares differing views of caregiving through the lives of Maggie Briggins' daughter and granddaughter. These perspectives demonstrate that mental illness and/or trauma are not what define a person but are simply a part of their lives. The number of individuals seeking help with mental health issues and trauma, especially among the younger generations, seems to be skyrocketing. Therefore, a larger body of literature that deals with such topics in a respectful and humanizing way is needed if our culture is to lovingly embrace individuals whose lives have been changed by these issues.
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Date Issued: 2017
Identifier: CFH2000355, ucf:45806
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000355

Title: TAXING WORKING MEMORY: THE EFFECTS ON CATEGORY LEARNING.
Creator: Ercolino, Ashley, Bohil, Corey, University of Central Florida
Abstract / Description: In the past decade, the COVIS model (Ashby, Alfonso-Reese, Turken, & Waldron, 1998) has emerged as the only neuropsychological theory for the existence of multiple brain systems for category learning. COVIS postulates that there are two systems, explicit and implicit, which compete against one another. These two systems reply on two discrete networks: explicit, or rule based categorization relies on executive function and working memory while implicit, or information integration...
Show moreIn the past decade, the COVIS model (Ashby, Alfonso-Reese, Turken, & Waldron, 1998) has emerged as the only neuropsychological theory for the existence of multiple brain systems for category learning. COVIS postulates that there are two systems, explicit and implicit, which compete against one another. These two systems reply on two discrete networks: explicit, or rule based categorization relies on executive function and working memory while implicit, or information integration categorization is mediated by dopaminergic pathways. The purpose of this pilot study was to further provide evidence for the existence of multiple systems of category learning. In all three experiments, we interrupted feedback processing using a modified Sternberg task. In Experiment 1 and 2, participants were separated into four conditions, rule based (RB) categorization with a short delay between feedback and the modified Sternberg task, RB categorization with a long delay, information integration (II) categorization with a short delay, and II categorization with a long delay. Participants in the RB conditions performed worse than those in the II conditions in Experiment 1 and 2. After determining there was no significant difference between the short and long delay manipulations, only the short delay was used for Experiment 3. Consistent with Experiment 1 and 2, participants in the RB condition performed worse than those in the II condition. Functional near-infrared spectroscopy (fNIRS) technology was also used in Experiment 3 to determine the difference in prefrontal activation between RB and II conditions. Although statistically not significant, across blocks, the difference in prefrontal activation increased.
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Date Issued: 2015
Identifier: CFH0004870, ucf:45471
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004870

Title: THE SERVICE LEARNING EXPERIENCE: HOW STORYTELLING EVOLVES IN PEOPLE WITH ALZHEIMER'S AND DEMENTIA AND WHY THIS IS IMPORTANT TO THE CREATIVE WRITING STUDENT AND THE COMMUNITY.
Creator: Spicer, Alice, Thaxton, Terry, University of Central Florida
Abstract / Description: All meaningful communication is a form of storytelling, according to Walter Fisher, who introduced the narrative paradigm to communication theory, and storytelling is universal across cultures and time as the manner in which people comprehend life. Storytelling is also a creative form of art. This interdisciplinary, multimedia work will explore the creative use of non-traditional storytelling to gather information about how creativity evolves in people with Alzheimer's and dementia and why...
Show moreAll meaningful communication is a form of storytelling, according to Walter Fisher, who introduced the narrative paradigm to communication theory, and storytelling is universal across cultures and time as the manner in which people comprehend life. Storytelling is also a creative form of art. This interdisciplinary, multimedia work will explore the creative use of non-traditional storytelling to gather information about how creativity evolves in people with Alzheimer's and dementia and why this is important to both academia and the community. Currently, there is a lot of research available about the debilitating affects of memory loss, but there is very little research available about retained abilities. Perhaps, just as the blind significantly outperform the sighted in tactile experiments, there are some forms of creativity in storytelling in which people with Alzheimer's and dementia may demonstrate more ability than their fully cognizant peers. My goal is to contribute to a small but growing effort to explore "memory loss as more than just memory loss" (Dr. Anne Bastings).
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Date Issued: 2013
Identifier: CFH0004442, ucf:45104
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004442

Title: The Effect of Martensite-Fractions Assumptions In Shape Memory Alloy Springs.
Creator: Vazquez, Christian, Kauffman, Jeffrey L., Das, Tuhin, Kwok, Kawai, University of Central Florida
Abstract / Description: This research addresses various models of a spring-mass system that uses a spring made of a shape memory alloy (SMA). The system model describes the martensite fractions, which are values that describe an SMA's crystalline phases, via differential equations. The model admits and this thesis contrasts two commonly used but distinct assumptions: a homogeneous case where the martensite fractions are constant throughout the spring's cross section, and a bilinear case where the evolution of the...
Show moreThis research addresses various models of a spring-mass system that uses a spring made of a shape memory alloy (SMA). The system model describes the martensite fractions, which are values that describe an SMA's crystalline phases, via differential equations. The model admits and this thesis contrasts two commonly used but distinct assumptions: a homogeneous case where the martensite fractions are constant throughout the spring's cross section, and a bilinear case where the evolution of the martensite fractions only occurs beyond some critical radius. While previous literature has developed a model of the system dynamics under the homogeneous assumption using the martensite-fractions differential equations, little research has focused on the dynamics when considering the bilinear case, especially using the differential equations. This thesis models the system dynamics under both the homogeneous and bilinear assumptions and determines if the bilinear case is an improvement over the homogeneous case. The research develops a numerical approach of the system dynamics for both martensite-fractions assumptions. For various initial displacements and temperatures, plotting the resulting displacement, velocity, and martensite fractions over time determines the coherence of the assumptions. Not only did the bilinear assumption offer more reasonable plots, but the homogeneous assumption delivered bizarre results for certain temperatures and initial displacements. For future research, a fully nonlinear case can replace the homogeneous and bilinear assumptions. Additionally, future research can utilize other martensite-fractions evolution models, as opposed to differential equations.
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Date Issued: 2018
Identifier: CFE0007381, ucf:52742
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007381

Title: The Performance and Power Impact of Using Multiple DRAM Address Mapping Schemes in Multicore Processors.
Creator: Jadaa, Rami, Heinrich, Mark, DeMara, Ronald, Yuan, Jiann-Shiun, University of Central Florida
Abstract / Description: Lowest-level cache misses are satisfied by the main memory through a specific address mapping scheme that is hard-coded in the memory controller. A dynamic address mapping scheme technique is investigated to provide higher performance and lower power consumption, and a method to throttle memory to meet a specific power budget. Several experiments are conducted on single and multithreaded synthetic memory traces -to study extreme cases- and validate the usability of the proposed dynamic...
Show moreLowest-level cache misses are satisfied by the main memory through a specific address mapping scheme that is hard-coded in the memory controller. A dynamic address mapping scheme technique is investigated to provide higher performance and lower power consumption, and a method to throttle memory to meet a specific power budget. Several experiments are conducted on single and multithreaded synthetic memory traces -to study extreme cases- and validate the usability of the proposed dynamic mapping scheme over the fixed one. Results show that applications' performance varies according to the mapping scheme used, and a dynamic mapping scheme achieves up to 2x increase in peak bandwidth utilization and around 30% higher energy efficiency than a system using only a single fixed scheme Moreover, the technique can be used to limit memory accesses into a subset of the memory devices by controlling data allocation at a finer granularity, providing a method to throttle main memory by allowing un-accessed devices to be put into power-down mode, hence saving power to meet a certain power budget.
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Date Issued: 2011
Identifier: CFE0004121, ucf:49118
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004121

Title: DOES CHRONIC STRESS ACCELERATE LATE-AGING COGNITIVE DECLINE IN MEMORY AND EXECUTIVE FUNCTIONING?.
Creator: Robinson, Diane, Bedwell, Jeffrey, University of Central Florida
Abstract / Description: Few studies exist examining the relationship between self-reported stress and cognitive function in healthy nonpsychiatric older adults, and even less studies have examined whether high levels of self-reported stress accelerate the cognitive decline found in normal late-aging populations. A group of older nonpsychiatric adults, ages 54 years and above, were asked to complete three measures assessing their self-perceived stress over the past month, past year, and their lifetime. Sixty-one...
Show moreFew studies exist examining the relationship between self-reported stress and cognitive function in healthy nonpsychiatric older adults, and even less studies have examined whether high levels of self-reported stress accelerate the cognitive decline found in normal late-aging populations. A group of older nonpsychiatric adults, ages 54 years and above, were asked to complete three measures assessing their self-perceived stress over the past month, past year, and their lifetime. Sixty-one adults between the ages of 54 and 88 (52% female) participated in a second phase in which neuropsychological tasks were administered to assess three cognitive domains; memory, learning, and executive functioning. A hierarchical regression examined each of the three domain scores to explore whether self-perceived acute and chronic stress, after covaring for state anxiety, was related to neuropsychological performance. No statistically significant regressions were found, which was predicted for the learning domain, but contrary to the hypotheses for the memory and executive functioning domain. The potential influence of age in this study was explored in a series of ANOVAs examining the interactions between the three stress measures with state anxiety and age on the three cognitive domains. A statistically significant interaction was found between age and perceived lifetime stress when examining the memory domain score. In the young-old participants an increase in stress showed a non-significant relationship with a decrease in memory performance, while in the older-old participants the opposite non-significant tendency was found. The current study also partially replicated an earlier report of a relationship between an increase in recent self-reported stress and a decrease in performance on a specific divided attention task, and extended this finding to include older adults. While the majority of the studyÃ‚Â's hypotheses were not supported, these preliminary findings provide the field with interesting areas to explore in future studies.
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Date Issued: 2010
Identifier: CFE0003256, ucf:48515
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003256

Title: Energy-Aware Data Movement In Non-Volatile Memory Hierarchies.
Creator: Khoshavi Najafabadi, Navid, DeMara, Ronald, Yuan, Jiann-Shiun, Song, Zixia, University of Central Florida
Abstract / Description: While technology scaling enables increased density for memory cells, the intrinsic high leakagepower of conventional CMOS technology and the demand for reduced energy consumption inspiresthe use of emerging technology alternatives such as eDRAM and Non-Volatile Memory (NVM) including STT-MRAM, PCM, and RRAM. The utilization of emerging technology in Last Level Cache (LLC) designs which occupies a signi?cant fraction of total die area in Chip Multi Processors (CMPs) introduces new dimensions...
Show moreWhile technology scaling enables increased density for memory cells, the intrinsic high leakagepower of conventional CMOS technology and the demand for reduced energy consumption inspiresthe use of emerging technology alternatives such as eDRAM and Non-Volatile Memory (NVM) including STT-MRAM, PCM, and RRAM. The utilization of emerging technology in Last Level Cache (LLC) designs which occupies a signi?cant fraction of total die area in Chip Multi Processors (CMPs) introduces new dimensions of vulnerability, energy consumption, and performance delivery. To be speci?c, a part of this research focuses on eDRAM Bit Upset Vulnerability Factor (BUVF) to assess vulnerable portion of the eDRAM refresh cycle where the critical charge varies depending on the write voltage, storage and bit-line capacitance. This dissertation broaden the study on vulnerability assessment of LLC through investigating the impact of Process Variations (PV) on narrow resistive sensing margins in high-density NVM arrays, including on-chip cache and primary memory. Large-latency and power-hungry Sense Ampli?ers (SAs) have been adapted to combat PV in the past. Herein, a novel approach is proposed to leverage the PV in NVM arrays using Self-Organized Sub-bank (SOS) design. SOS engages the preferred SA alternative based on the intrinsic as-built behavior of the resistive sensing timing margin to reduce the latency and power consumption while maintaining acceptable access time.On the other hand, this dissertation investigates a novel technique to prioritize the service to 1)Extensive Read Reused Accessed blocks of the LLC that are silently dropped from higher levelsof cache, and 2) the portion of the working set that may exhibit distant re-reference interval in L2. In particular, we develop a lightweight Multi-level Access History Pro?ler to ef?ciently identifyERRA blocks through aggregating the LLC block addresses tagged with identical Most Signi?cantBits into a single entry. Experimental results indicate that the proposed technique can reduce theL2 read miss ratio by 51.7% on average across PARSEC and SPEC2006 workloads.In addition, this dissertation will broaden and apply advancements in theories of subspace recoveryto pioneer computationally-aware in-situ operand reconstruction via the novel Logic In Intercon-nect (LI2) scheme. LI2 will be developed, validated, and re?ned both theoretically and experimentally to realize a radically different approach to post-Moore's Law computing by leveraginglow-rank matrices features offering data reconstruction instead of fetching data from main memory to reduce energy/latency cost per data movement. We propose LI2 enhancement to attain highperformance delivery in the post-Moore's Law era through equipping the contemporary micro-architecture design with a customized memory controller which orchestrates the memory requestfor fetching low-rank matrices to customized Fine Grain Recon?gurable Accelerator (FGRA) forreconstruction while the other memory requests are serviced as before. The goal of LI2 is to conquer the high latency/energy required to traverse main memory arrays in the case of LLC miss, by using in-situ construction of the requested data dealing with low-rank matrices. Thus, LI2 exchanges a high volume of data transfers with a novel lightweight reconstruction method under speci?c conditions using a cross-layer hardware/algorithm approach.
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Date Issued: 2017
Identifier: CFE0006754, ucf:51859
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006754

Title: Exploring new boundaries in team cognition: Integrating knowledge in distributed teams.
Creator: Zajac, Stephanie, Salas, Eduardo, Bowers, Clint, Burke, Shawn, University of Central Florida
Abstract / Description: Distributed teams continue to emerge in response to the complex organizational environments brought about by globalization, technological advancements, and the shift toward a knowledge-based economy. These teams are comprised of members who hold the disparate knowledge necessary to take on cognitively demanding tasks. However, knowledge coordination between team members who are not co-located is a significant challenge, often resulting in process loss and decrements to the effectiveness of...
Show moreDistributed teams continue to emerge in response to the complex organizational environments brought about by globalization, technological advancements, and the shift toward a knowledge-based economy. These teams are comprised of members who hold the disparate knowledge necessary to take on cognitively demanding tasks. However, knowledge coordination between team members who are not co-located is a significant challenge, often resulting in process loss and decrements to the effectiveness of team level knowledge structures. The current effort explores the configuration dimension of distributed teams, and specifically how subgroup formation based on geographic location, may impact the effectiveness of a team's transactive memory system and subsequent team process. In addition, the role of task cohesion as a buffer to negative intergroup interaction is explored.
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Date Issued: 2014
Identifier: CFE0005449, ucf:50393
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005449

Title: Autobiographical Memory and Theory of Mind in Schizotypy.
Creator: Deptula, Andrew, Bedwell, Jeffrey, Beidel, Deborah, Sims, Valerie, University of Central Florida
Abstract / Description: Individuals with schizophrenia exhibit marked impairments on tasks assessing theory of mind (ToM) and autobiographical memory (AM) qualities, and preliminary research has indicated a positive link between these abilities. This study is the first to systematically explore this relationship in the related personality trait of schizotypy. In a study of 47 undergraduate students (23 males) reporting a wide continuous range of schizotypy, we found that females, but not males, exhibited a negative...
Show moreIndividuals with schizophrenia exhibit marked impairments on tasks assessing theory of mind (ToM) and autobiographical memory (AM) qualities, and preliminary research has indicated a positive link between these abilities. This study is the first to systematically explore this relationship in the related personality trait of schizotypy. In a study of 47 undergraduate students (23 males) reporting a wide continuous range of schizotypy, we found that females, but not males, exhibited a negative correlation between ToM and schizotypy, and an unexpected positive correlation between AM qualities and schizotypy. Factor score analysis within females indicated that disorganized schizotypy was the strongest correlate of both ToM (i.e., affective ToM; ability to infer emotions), and AM qualities (i.e., mental imagery vividness). Finally, independent of schizotypy and sex, ToM was negatively correlated with AM qualities. This negative association between ToM and AM as well as the positive relationship between schizotypy and AM (in females) distinguish findings in schizotypy from those in schizophrenia. Although, the qualities of AM in schizotypy are relatively unexplored in schizotypy, overlapping and AM-related constructs (e.g., mental image vividness, creativity) are enhanced in schizotypy. This phenomenon is theorized to occur due to a reduced latent inhibition process, which also reveals distinct patterns of sexual dimorphism in schizotypy. In sum, the current study found sex to be a critical variable in each hypothesis, demonstrating a unique pattern in females, but not males. It could be that distinct underlying mechanisms account for sex differences on ToM and AM tasks in schizophrenia-related disorders.
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Date Issued: 2013
Identifier: CFE0004671, ucf:49855
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004671

Title: MEMORY-CRAFT: THE ROLE OF DOMESTIC TECHNOLOGY IN WOMEN'S JOURNALS.
Creator: Powley, Tammy, Saper, Craig, University of Central Florida
Abstract / Description: The term "memory-craft" refers to arts and crafts media where personal memorabilia and journaling are combined and assembled into book form. Examples of memory-crafts include scrapbooks, art journals, and altered books. Traditionally, women have been the primary assemblers of memory-crafts, using this form as a method of autobiography and genealogical archiving. Memory-crafting is often associated with the amateur home-crafter, and while historians have long understood its cultural...
Show moreThe term "memory-craft" refers to arts and crafts media where personal memorabilia and journaling are combined and assembled into book form. Examples of memory-crafts include scrapbooks, art journals, and altered books. Traditionally, women have been the primary assemblers of memory-crafts, using this form as a method of autobiography and genealogical archiving. Memory-crafting is often associated with the amateur home-crafter, and while historians have long understood its cultural significance, academia has not properly considered memory-craft as a type of alternative discourse. The purpose of this study is to examine the use of memory-crafting as a non-traditional method of writing, especially among women who use it to record personal and familial narratives. Just as women are usually the primary care-takers of the family, through memory-craft they also become responsible for collecting and preserving memories, which would otherwise become lost. These memories of the everyday – birthday parties, family vacations, and wedding anniversaries – grow to be culturally significant over time. Through the use of domestic technology, which today includes both paper scraps and home computer systems, memory-crafts assist in the interpretation of the present and provide insight into the past. To help explore the connection between domestic technology and memory-crafts, I have organized this study into four themes: history and memory-craft; women and domestic technology; feminist literary autobiography and memoir; and feminism and hypermedia. My approach is a mixture of fictionalized personal narrative and analysis loosely modeled after Writing Machines by N. Katherine Halyes and Alias Olympia by Eunice Lipton. Just as I discuss experimental methods of writing in the form of memory-crafting, I also use an experimental writing technique which gathers from personal memories in the form of a persona named Tess and from the life of my Great Aunt Mamie Veach Dudley. Mamie's journals and letter to her sister document the memories of the Dudleys including a tragic double suicide, which still haunts the Dudleys almost 100 years later. As narrator and storyteller, my stories connect to those documented by Mamie and link the past to the present. Along with Mamie's family records, I consider other memory-related works by women during the eighteenth and nineteenth centuries including Jane Austen, Anne Bronte, and Emily Dickinson, and I also examine contemporary memory-crafters such as those constructed by altered book artists Tom Phillips and Judith Margolis. Digital memory-craft is another source of support for my argument, and I look at web groups and bloggers. For example, I discuss the Wish Jar Journal, a weblog written by illustrator Keri Smith, where she journals her life and creative process and often mixes textual and visual elements in her blog posts. Writer and blogger Heather Armstrong from Dooce.com is another case study included in this project as her blog is an example of documenting familial events and memoir. Because of their fragmented formats and narrative elements, hardcopy and digitally-based memory-crafts become artifacts which combine text and visual elements to tell a story and pass on knowledge of the everyday through the mixture of text and domestic technology. Memory-craft construction does not follow conventional writing models. Therefore, this provides opportunity for experimentation by those writers who have traditionally been removed from established rhetorical writing methods.
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Date Issued: 2006
Identifier: CFE0001365, ucf:46992
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001365

Title: Learning Internal State Memory Representations from Observation.
Creator: Wong, Josiah, Gonzalez, Avelino, Liu, Fei, Wu, Annie, Ontanon, Santiago, Wiegand, Rudolf, University of Central Florida
Abstract / Description: Learning from Observation (LfO) is a machine learning paradigm that mimics how people learn in daily life: learning how to do something simply by watching someone else do it. LfO has been used in various applications, from video game agent creation to driving a car, but it has always been limited by the inability of an observer to know what a performing entity chooses to remember as they act in an environment. Various methods have either ignored the effects of memory or otherwise made...
Show moreLearning from Observation (LfO) is a machine learning paradigm that mimics how people learn in daily life: learning how to do something simply by watching someone else do it. LfO has been used in various applications, from video game agent creation to driving a car, but it has always been limited by the inability of an observer to know what a performing entity chooses to remember as they act in an environment. Various methods have either ignored the effects of memory or otherwise made simplistic assumptions about its structure. In this dissertation, we propose a new method, Memory Composition Learning, that captures the influence of a performer's memory in an observed behavior through the creation of an auxiliary memory feature set that explicitly models the aspects of the environment with significance for future decisions, and which can be used with a machine learning technique to provide salient information from memory. It advances the state of the art by automatically learning the internal structure of memory instead of ignoring or predefining it. This research is difficult in that memory modeling is an unsupervised learning problem that we elect to solve solely from unobtrusive observation. This research is significant for LfO in that it will allow learning techniques that otherwise could not use information from memory to use a tailored set of learned memory features that capture salient influences from memory and enable decision-making based on these influences for more effective learning performance. To validate our hypothesis, we implemented a prototype for modeling observed memory influences with our approach and applied it to simulated vacuum cleaner and lawn mower domains. Our investigation revealed that MCL was able to automatically learn memory features that describe the influences on an observed actor's internal state, and which improved learning performance of observed behaviors.
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Date Issued: 2019
Identifier: CFE0007879, ucf:52755
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007879

Title: The Mothers: An Exploration of Memory and Secondary Knowledge.
Creator: Battle, Taylor, Raimundi-Ortiz, Wanda, Harris, Christopher, Price, Mark, University of Central Florida
Abstract / Description: I consider the experiences of past generations of women in my family and my relationship to them. This body of work began with Bessie, a portrait of my father's mother. I painted it after attending her funeral. I did not have a meaningful relationship with either of my grandmothers. This led me to consider my right to portray them. My need to admit my incomplete memory and avoid the objectification of my subjects caused me to question my perspective. I wanted to memorialize these women to...
Show moreI consider the experiences of past generations of women in my family and my relationship to them. This body of work began with Bessie, a portrait of my father's mother. I painted it after attending her funeral. I did not have a meaningful relationship with either of my grandmothers. This led me to consider my right to portray them. My need to admit my incomplete memory and avoid the objectification of my subjects caused me to question my perspective. I wanted to memorialize these women to avoid their erasure. Through the progressive abstraction of these women's figures, I chase an honest representation of my understanding.
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Date Issued: 2016
Identifier: CFE0006072, ucf:50947
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006072

Title: The Rhetoric of Public Memory in Urban Park Revitalization in 20th Century Jacksonville, Florida.
Creator: Kelley, Mary, Cassanello, Robert, Gordon, Fon, Dandrow, Edward, University of Central Florida
Abstract / Description: In recent decades the study human geography has become an increasingly enlightening mode of analysis in the historian's repertoire. One area in which this method has proved insightful is in the exploration of the various ways that interpretations of the past in public places shape the public consciousness. Works on this topic have primarily been broad studies that look at public representations of the past regionally, nationally, or even globally. This study seeks to provide a more nuanced...
Show moreIn recent decades the study human geography has become an increasingly enlightening mode of analysis in the historian's repertoire. One area in which this method has proved insightful is in the exploration of the various ways that interpretations of the past in public places shape the public consciousness. Works on this topic have primarily been broad studies that look at public representations of the past regionally, nationally, or even globally. This study seeks to provide a more nuanced perspective on the complex ways in which public memory and place are created, and continually shaped, through a case study which takes an in-depth look at this process in one locale. This comparative analysis of Jacksonville, Florida's Hemming and Memorial Parks throughout the twentieth century explores how monuments, commemorative events, and historical discourses act as rhetorical devices which promote partisan ideologies within public parks, which shape the public perception of the both the past and the present. In particular, this study explores the revitalization campaigns of Hemming and Memorial Parks in the last quarter of the century to demonstrate how the rhetoric of public memory has been used strategically to recreate the public perception of each park in an effort to control access to and behavior within each park.
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Date Issued: 2016
Identifier: CFE0006125, ucf:51176
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006125

Title: TRANSMISSION ELECTRON MICROSCOPY STUDIES IN SHAPE MEMORY ALLOYS.
Creator: TIYYAGURA, MADHAVI, VAIDYANATHAN, RAJ, University of Central Florida
Abstract / Description: In NiTi, a reversible thermoelastic martensitic transformation can be induced by temperature or stress between a cubic (B2) austenite phase and a monoclinic (B19') martensite phase. Ni-rich binary compositions are cubic at room temperature (requiring stress or cooling to transform to the monoclinic phase), while Ti-rich binary compositions are monoclinic at room temperature (requiring heating to transform to the cubic phase). The stress induced transformation results in the superelastic...
Show moreIn NiTi, a reversible thermoelastic martensitic transformation can be induced by temperature or stress between a cubic (B2) austenite phase and a monoclinic (B19') martensite phase. Ni-rich binary compositions are cubic at room temperature (requiring stress or cooling to transform to the monoclinic phase), while Ti-rich binary compositions are monoclinic at room temperature (requiring heating to transform to the cubic phase). The stress induced transformation results in the superelastic effect, while the thermally induced transformation is associated with strain recovery that results in the shape memory effect. Ternary elemental additions such as Fe can additionally introduce an intermediate rhombohedral (R) phase between the cubic and monoclinic phase transformation. This work was initiated with the broad objective of connecting the macroscopic behavior in shape memory alloys with microstructural observations from transmission electron microscopy (TEM). Specifically, the goals were to examine (i) the effect of mechanical cycling and plastic deformation in superelastic NiTi; (ii) the effect of thermal cycling during loading in shape memory NiTi; (iii) the distribution of twins in martensitic NiTi-TiC composites; and (iv) the R-phase in NiTiFe. Both in situ and ex situ lift out focused ion beam (FIB) and electropolishing techniques were employed to fabricate shape memory alloy samples for TEM characterization. The Ni rich NiTi samples were fully austenitic in the undeformed state. The introduction of plastic deformation (8% and 14% in the samples investigated) resulted in the stabilization of martensite in the unloaded state. An interlaying morphology of the austenite and martensite was observed and the martensite needles tended to orient themselves in preferred orientations. The aforementioned observations were more noticeable in mechanically cycled samples. The observed dislocations in mechanically cycled samples appear to be shielded from the external applied stress via mismatch accommodation since they are not associated with unrecoverable strain after a load-unload cycle. On application of stress, the austenite transforms to martensite and is expected to accommodate the stress and strain mismatch through preferential transformation, variant selection, reorientation and coalescence. The stabilized martensite (i.e., martensite that exists in the unloaded state) is expected to accommodate the mismatch through variant reorientation and coalescence. On thermally cycling a martensitic NiTi sample under load through the phase transformation, significant variant coalescence, variant reorientation and preferred variant selection was observed. This was attributed to the internal stresses generated as a result of the thermal cycling. A martensitic NiTi-TiC composite was also characterized and the interface between the matrix and the inclusion was free of twins while significant twins were observed at a distance away from the matrix-inclusion interface. Incorporating a cold stage, diffraction patterns from NiTiFe samples were obtained at temperatures as low as -160ºC. Overall, this work provided insight in to deformation phenomena in shape memory materials that have implications for engineering applications (e.g., cyclic performance of actuators, engineering life of superelastic components, stiffer shape memory composites and low-hysteresis R-phase based actuators). This work was supported in part by an NSF CAREER award (DMR 0239512).
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Date Issued: 2005
Identifier: CFE0000500, ucf:46462
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000500

Title: CRYOGENIC SHAPE MEMORY ALLOY ACTUATORS FOR SPACEPORT TECHNOLOGIES: MATERIALS CHARACTERIZATION AND PROTOTYPE TESTING.
Creator: Lemanski, Jennifer, Vaidyanathan, Rajan, University of Central Florida
Abstract / Description: Shape memory alloys (SMAs) possess the unique ability to change their shape by undergoing a solid-state phase transformation at a particular temperature. The shape change is associated with a large strain recovery as the material returns to its "remembered" shape. Their ability to act as both sensor and actuator has made them an attractive subject of study for numerous applications. SMAs have many characteristics which are advantageous in space-related applications, including generation of...
Show moreShape memory alloys (SMAs) possess the unique ability to change their shape by undergoing a solid-state phase transformation at a particular temperature. The shape change is associated with a large strain recovery as the material returns to its "remembered" shape. Their ability to act as both sensor and actuator has made them an attractive subject of study for numerous applications. SMAs have many characteristics which are advantageous in space-related applications, including generation of large forces associated with the strain recovery, smooth and controlled movements, large movement to weight ratio, high reliability, and spark-free operation. The objective of this work is the further development and testing of a cryogenic thermal conduction switch as part of NASA funded projects. The switch was developed to provide a variable conductive pathway between liquid methane and liquid oxygen dewars in order to passively regulate the methane temperature. Development of the switch concept has been continued in this work by utilizing Ni-Ti-Fe as the active SMA element. Ni-Ti-Fe exhibits the shape memory effect at cryogenic temperatures, which makes it well suited for low temperature applications. This alloy is also distinguished by an intermediate phase change known as the rhombohedral or R-phase, which is characterized by a small hysteresis (typically 1-2 deg C) and offers the advantage of precise control over a set temperature range. For the Ni-Ti-Fe alloy used, its thermomechanical processing, subsequent characterization using dilatometry and differential scanning calorimetry and implementation in the conduction switch configuration are addressed. This work was funded by grants from NASA KSC (NAG10-323) and NASA GRC (NAG3-2751).
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Date Issued: 2005
Identifier: CFE0000501, ucf:46448
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000501

Title: THE RELATIONSHIP BETWEEN SLEEP, WORKING MEMORY, AND DECISION MAKING IN YOUNG AND OLD ADULT POPULATIONS.
Creator: Merz, Melissa G., Lighthall, Nichole, University of Central Florida
Abstract / Description: Sleep is known to influence basic tasks concerning working memory, reaction time and executive functioning (Silva, Wang, Ronda, Wyatt, & Duffy, 2010; Nebes, Buysse, Halligan, Houck, & Monk, 2009). However, the amount that sleep influences these functions varies from study to study possibly due to differences in age and task design. Aim 1A of this study is to determine if sleep quality affects working memory. Aim 1B of this study is to determine if age affects sleep quality and working memory...
Show moreSleep is known to influence basic tasks concerning working memory, reaction time and executive functioning (Silva, Wang, Ronda, Wyatt, & Duffy, 2010; Nebes, Buysse, Halligan, Houck, & Monk, 2009). However, the amount that sleep influences these functions varies from study to study possibly due to differences in age and task design. Aim 1A of this study is to determine if sleep quality affects working memory. Aim 1B of this study is to determine if age affects sleep quality and working memory in comparison of young and old adult populations. Finally, Aim 2 of this study is to determine if there is a relationship between sleep quality, working memory, and decision making in the younger adults. These aims were researched using a validated and commonly used sleep questionnaire: the Pittsburgh Sleep Quality Index (PSQI). In addition, the study utilized an n-back test to measure working memory and executive functioning, and an economic decision task to measure decision making accuracy. Results show that sleep quality did not significantly influence accuracy on an n-back test in either age group, but age was significantly correlated with accuracy on an n-back test in the older adults. The study also found a relationship between working memory performance and complex decision making among younger adults, but this relationship was not modulated by sleep quality. Our findings suggest that self-reported sleep quality is not a strong predictor of working memory or complex decision making, particularly in early adulthood. Future research on this topic may benefit from a more objective measure of sleep quality and from larger samples across different phases of the lifespan.
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Date Issued: 2017
Identifier: CFH2000210, ucf:46023
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000210

Title: WORKING MEMORY, SEARCH, AND SIGNAL DETECTION: IMPLICATIONS FOR INTERACTIVE VOICE RESPONSE SYSTEM MENU DESIGN.
Creator: Commarford, Patrick, Smither, Janan, University of Central Florida
Abstract / Description: Many researchers and speech user interface practitioners assert that interactive voice response (IVR) menus must be relatively short due to constraints of the human memory system. These individuals commonly cite Miller's (1956) paper to support their claims. The current paper argues that these authors commonly misuse the information provided in Miller's paper and that hypotheses drawn from modern theories of working memory (e.g., Baddeley and Hitch, 1974) would lead to the opposite conclusion...
Show moreMany researchers and speech user interface practitioners assert that interactive voice response (IVR) menus must be relatively short due to constraints of the human memory system. These individuals commonly cite Miller's (1956) paper to support their claims. The current paper argues that these authors commonly misuse the information provided in Miller's paper and that hypotheses drawn from modern theories of working memory (e.g., Baddeley and Hitch, 1974) would lead to the opposite conclusion – that reducing menu length by creating a greater number of menus and a deeper structure will actually be more demanding on users' working memories and will lead to poorer performance and poorer user satisfaction. The primary purpose of this series of experiments was to gain a greater understanding of the role of working memory in speech-enabled IVR use. The experiments also sought to determine whether theories of visual search and signal detection theory (SDT) could be used to predict auditory search behavior. Results of this experiment indicate that creating a deeper structure with shorter menus is detrimental to performance and satisfaction and more demanding of working memory resource. Further the experiment provides support for arguments developed from Macgregor, Lee, and Lam's dual criterion decision model and is a first step toward applying SDT to the IVR domain.
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Date Issued: 2006
Identifier: CFE0000987, ucf:46715
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000987

Title: WARNING COMPLIANCE: EFFECTS OF STRESS AND WORKING MEMORY.
Creator: Helmick-Rich, Jessica, Hancock, Peter A, University of Central Florida
Abstract / Description: ABSTRACT This study investigated the effects of cross-modality warning presentation and retention in a dual-task paradigm in a simulated military environment under various task-induced stress levels. It was also intended to determine what role working memory played in the mode of warning presentation that resulted in the highest retention and subsequent compliance. An all within participant design was created in order to determine if scores on working memory span tasks predicted performance...
Show moreABSTRACT This study investigated the effects of cross-modality warning presentation and retention in a dual-task paradigm in a simulated military environment under various task-induced stress levels. It was also intended to determine what role working memory played in the mode of warning presentation that resulted in the highest retention and subsequent compliance. An all within participant design was created in order to determine if scores on working memory span tasks predicted performance across the varying forms of warning presentation. Furthermore, task-induced stress levels were varied over the course of the experiment to identify if workload transitions affected performance. Results revealed that when the presentation format and the response format matched (e.g., verbal-verbal), behavioral compliance was greater then when presentation and response format were mismatched (e.g., verbal-pictorial). Thus, it is not necessarily the presentation type that affects compliance, but the combination of presentation and response mode. Analysis also revealed that the pictorial-pictorial warning combination resulted in greater behavioral compliance compared to verbal-verbal or written-written combinations. The format of warning presentation did not affect performance on the operational tasks as predicted. Thus, the visual/spatial operational task, regardless of its complexity was not interrupted in timesharing with intra-modal warning presentations or cross-modal time-sharing. As predicted, task based stress affected the WCCOM task in all experimental procedures. Results further revealed that as task demand increased, performance on the WCCOM task decreased. Task demand did affect the operational tasks, the shooting and the navigation tasks. The shooting task, which was less complex than the navigation task was not affected by lower levels of task demand, but at the greatest level of demand (eight warnings) performance in the operational task, degraded. Degradations in performance on the more complex task, the navigation task, materialized at a moderate level of task demand (four warnings). For subjective ratings, task demand did affect workload ratings. As the task demand increased, the subjective workload ratings also increased, revealing a true association between workload and subjective ratings. The working memory separability hypothesis was supported by the working memory span tasks, but consequently they were not predictive of the warning presentation format.
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Date Issued: 2005
Identifier: CFE0000725, ucf:46624
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000725

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