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(1 - 11 of 11)
- Title
- Mirrors as Portals: Images of Mirrors on Ancient Maya Ceramics.
- Creator
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Rogers, Julie, Callaghan, Michael, Kovacevich, Brigitte, Reyes-Foster, Beatriz, University of Central Florida
- Abstract / Description
-
The Maya believed there were multiple worlds in addition to the human world. Portals connected these worlds and allowed active engagement between the Maya and their gods. Without portals and the ability to communicate between the worlds the Maya belief system could not function. Evidence suggests the Maya believed reflective surfaces (-) mirrors and water surfaces (-) were portals to spiritual worlds. In this thesis, I examine the portrayal of mirrors as portals in Maya art, focusing on...
Show moreThe Maya believed there were multiple worlds in addition to the human world. Portals connected these worlds and allowed active engagement between the Maya and their gods. Without portals and the ability to communicate between the worlds the Maya belief system could not function. Evidence suggests the Maya believed reflective surfaces (-) mirrors and water surfaces (-) were portals to spiritual worlds. In this thesis, I examine the portrayal of mirrors as portals in Maya art, focusing on mirrors in scenes painted on ceramics. Combining archaeological, iconographical, and linguistic data I argue that mirrors functioned in service to ritual as an essential gateway between humans and the gods and were two-way portals between earthly and spiritual worlds. I specifically examine fifty-one scenes on painted ceramic vessels involving mirrors to interpret and document their function as portals between worlds, how they were used in courtly life and what they may have meant to the people who used them. This research contributes to a deeper understanding of the relationship between the Maya, their gods, and a particular aspect of material culture (-) mirrors (-) and how the elite used mirrors and their relationship with the gods as a source of power. I conclude that the gods are not omnipresent and that mirrors portals are always active and strategically placed for the gods to have the best view of the world of humans.
Show less - Date Issued
- 2019
- Identifier
- CFE0007857, ucf:52799
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007857
- Title
- FAR-INFRARED/MILLIMETER WAVE SOURCE AND COMPONENT DEVELOPMENT FOR IMAGING AND SPECTROSCOPY.
- Creator
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Du Bosq, Todd, Boreman, Glenn, University of Central Florida
- Abstract / Description
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The far-infrared and millimeter wave (FIR/mmW) (wavelength 75 micrometer to 10 mm) portion of the electromagnetic spectrum is fairly underdeveloped technologically, owing to the large amount of atmospheric attenuation in that range. At present, the FIR/mmW region is lacking in compact, high-brightness radiation sources and practical imaging systems. This dissertation focuses on development of two complementary technologies in this area – an active mmW imaging system and high-reflectivity...
Show moreThe far-infrared and millimeter wave (FIR/mmW) (wavelength 75 micrometer to 10 mm) portion of the electromagnetic spectrum is fairly underdeveloped technologically, owing to the large amount of atmospheric attenuation in that range. At present, the FIR/mmW region is lacking in compact, high-brightness radiation sources and practical imaging systems. This dissertation focuses on development of two complementary technologies in this area – an active mmW imaging system and high-reflectivity Bragg mirrors for the FIR p-Ge laser. The imaging system uses a vector network analyzer in the frequency range of 90-140 GHz as the radiation source and receiver. Raster scanning is used to map a two-dimensional field of view, demonstrating the detection and imaging of buried plastic landmines. Principal components analysis is used for hyperspectral signal processing, where a series of images is taken at discrete frequencies. Results are obtained as a function of depth and disturbance of the soil surface. In support of this study, various types of soils were characterized for scattering loss across the mmW/FIR region, with measured results compared to theory. This mmW imaging system was also used to demonstrate imaging through walls and other obscuring materials, as well as for imaging of rocks beneath volcanic sand, simulating the conditions encountered by an imaging system on a Mars rover vehicle. Furthermore, a high-reflectivity Si-etalon FIR mirror design was developed and demonstrated as a cavity mirror for the p-Ge laser. These components stand to have a number of systems-level impacts on FIR imagers. In the context of an active illuminator, they may allow narrowband selection from the broad emission spectrum of the p-Ge laser source. These mirrors can also be used in a Fabry-Perot FIR scanning spectrometer, where the resulting high finesse would give discrimination advantages in chemical sensing and astrophysical spectroscopy applications.
Show less - Date Issued
- 2007
- Identifier
- CFE0001665, ucf:47222
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001665
- Title
- NEGATIVE BIAS TEMPERATURE INSTABILITY AND CHARGE TRAPPING EFFECTS ON ANALOG AND DIGITAL CIRCUIT RELIABILITY.
- Creator
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Yu, Yixin, Yuan, Jiann. S., University of Central Florida
- Abstract / Description
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Nanoscale p-channel transistors under negative gate bias at an elevated temperature show threshold voltage degradation after a short period of stress time. In addition, nanoscale (45 nm) n-channel transistors using high-k (HfO2) dielectrics to reduce gate leakage power for advanced microprocessors exhibit fast transient charge trapping effect leading to threshold voltage instability and mobility reduction. A simulation methodology to quantify the circuit level degradation subjected to...
Show moreNanoscale p-channel transistors under negative gate bias at an elevated temperature show threshold voltage degradation after a short period of stress time. In addition, nanoscale (45 nm) n-channel transistors using high-k (HfO2) dielectrics to reduce gate leakage power for advanced microprocessors exhibit fast transient charge trapping effect leading to threshold voltage instability and mobility reduction. A simulation methodology to quantify the circuit level degradation subjected to negative bias temperature instability (NBTI) and fast transient charge trapping effect has been developed in this thesis work. Different current mirror and two-stage operation amplifier structures are studied to evaluate the impact of NBTI on CMOS analog circuit performances for nanoscale applications. Fundamental digital circuit such as an eleven-stage ring oscillator has also been evaluated to examine the fast transient charge transient effect of HfO2 high-k transistors on the propagation delay of ring oscillator performance. The preliminary results show that the negative bias temperature instability reduces the bandwidth of CMOS operating amplifiers, but increases the amplifier's voltage gain at mid-frequency range. The transient charge trapping effect increases the propagation delay of ring oscillator. The evaluation methodology developed in this thesis could be extended to study other CMOS device and circuit reliability issues subjected to electrical and temperature stresses.
Show less - Date Issued
- 2007
- Identifier
- CFE0001930, ucf:47432
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001930
- Title
- THE MIRRORED WALLS OF REALITY:A JOURNAL OF SHATTERED REFLECTION.
- Creator
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Bryant, Lisa, Ingram, Kate, University of Central Florida
- Abstract / Description
-
ABSTRACT Theatre in its most crude, poignant, and honest form exists as the unapologetic mirror of our world. It houses the piercing reflections of mankind's hope, fear, self-doubt, passion, joy, despair, brilliance, destitution, and desire. It becomes the image of all that man hopes to be, yearns to achieve, and knows he has destroyed. Theatrical performance is without equal in its ability to conjure visible truth from the reflection man sees everyday and hopelessly fails to recognize....
Show moreABSTRACT Theatre in its most crude, poignant, and honest form exists as the unapologetic mirror of our world. It houses the piercing reflections of mankind's hope, fear, self-doubt, passion, joy, despair, brilliance, destitution, and desire. It becomes the image of all that man hopes to be, yearns to achieve, and knows he has destroyed. Theatrical performance is without equal in its ability to conjure visible truth from the reflection man sees everyday and hopelessly fails to recognize. Ultimately, theatre demands that man see himself without the masks of excuse, ignorance, or makeup. It is the vision of this journey to honor theatre's mask-less demand. Through the development of a multi-scene theatrical performance; the collection and analysis of relevant research material; and the cultivation of a comprehensive journal outlining the processes, the challenges, and the revelations that will travel the same road--from the cluttered moments of conception to the still air of an empty room after an exhausting final bow--only a mirror will remain. Each component--production, research, and journal--will function as equally essential elements. They will illuminate the evolution of fully realized theatre and detail the composition of a common theatrical message: Truth is both the seed of desperation and discovery.
Show less - Date Issued
- 2006
- Identifier
- CFE0001166, ucf:46872
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001166
- Title
- SCANNING FABRY-PEROT SPECTROMETER FOR TERAHERTZ AND GIGAHERTZ SPECTROSCOPY USING DIELECTRIC BRAGG MIRRORS.
- Creator
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Cleary, Justin, Peale, Robert, University of Central Florida
- Abstract / Description
-
A scanning Fabry-Perot transmission filter composed of a pair of dielectric mirrors has been demonstrated at millimeter and sub-millimeter wavelengths. The mirrors are formed by alternating quarter-wave optical thicknesses of silicon and air in the usual Bragg configuration. Detailed theoretical considerations are presented for determining the optimum design including factors that affect achievable finesse. Fundamental loss by lattice and free carrier absorption are considered. High...
Show moreA scanning Fabry-Perot transmission filter composed of a pair of dielectric mirrors has been demonstrated at millimeter and sub-millimeter wavelengths. The mirrors are formed by alternating quarter-wave optical thicknesses of silicon and air in the usual Bragg configuration. Detailed theoretical considerations are presented for determining the optimum design including factors that affect achievable finesse. Fundamental loss by lattice and free carrier absorption are considered. High resistivity in the silicon layers was found important for achieving high transmittance and finesse, especially at the longer wavelengths. Also considered are technological factors such as surface roughness, bowing, and misalignment for various proposed manufacturing schemes. Characterization was performed at sub-mm wavelengths using a gas laser together with a Golay cell detector and at millimeter wavelengths using a backward wave oscillator and microwave power meter. A finesse value of 422 for a scanning Fabry-Perot cavity composed of three-period Bragg mirrors was experimentally demonstrated. Finesse values of several thousand are considered to be within reach. This suggests the possibility of a compact terahertz Fabry-Perot spectrometer that can operate in low resonance order to realize high free spectral range while simultaneously achieving a high spectral resolution. Such a device is directly suitable for airborne/satellite and man-portable sensing instrumentation.
Show less - Date Issued
- 2007
- Identifier
- CFE0001563, ucf:47128
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001563
- Title
- NURSING MANAGEMENT AND MIRROR THERAPY FOR PHANTOM LIMB PAIN.
- Creator
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Henry, Bridget, Allred, Kelly, University of Central Florida
- Abstract / Description
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Phantom limb pain may occur after the accidental removal or surgical amputation of a limb. Phantom limb pain is the experience of pain in the limb that is no longer present. The clinical management of phantom limb pain is essential in the overall reduction of patient rehabilitation and poor patient outcomes. A patient�s degree of phantom limb pain is influenced by their personal response to loss and pain and can have devastating effects to a person�s social performance, occupational role,...
Show morePhantom limb pain may occur after the accidental removal or surgical amputation of a limb. Phantom limb pain is the experience of pain in the limb that is no longer present. The clinical management of phantom limb pain is essential in the overall reduction of patient rehabilitation and poor patient outcomes. A patient�s degree of phantom limb pain is influenced by their personal response to loss and pain and can have devastating effects to a person�s social performance, occupational role, family role, relationships, and involvement in activities or hobbies. Like most chronic pain, phantom limb pain decreases the quality of life. Not all amputees who suffer from chronic pain respond to traditional therapies. The purpose of this integrated review of the literature was to explore current research and determine the efficacy of mirror therapy in the treatment of Phantom limb pain in amputees. A database search of CINAHL, PubMed (MEDLINE), and OneSearch was conducted. Mirror therapy had no reported side effects, was inexpensive, and was capable of being practiced at home and at the bedside. Relevant findings in the literature revealed a significant decrease in phantom limb pain when using mirror therapy for more than 4 weeks. Although limited research on the use of mirror therapy as an intervention for amputees, existing research supports the efficacy of mirror therapy for the management of phantom limb pain. Nurses and healthcare providers need education on mirror therapy to advocate for their patients to ensure the best possible outcome and reduction of phantom limb pain. Further research on mirror therapy is needed.
Show less - Date Issued
- 2016
- Identifier
- CFH2000028, ucf:45606
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH2000028
- Title
- SPECTROSCOPIC STUDIES OF LASER PLASMAS FOR EUV SOURCES.
- Creator
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George, Simi, Richardson, Martin, University of Central Florida
- Abstract / Description
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With the availability of high reflectivity multilayer mirrors and zone plate lenses, the EUV region (5nm - 40nm) of the electromagnetic spectrum is currently being explored for applications of nanoscale printing and imaging. Advances made in this area have consequences for many areas of science. Research for producing a compact, bright EUV source for laboratory use has gained momentum in recent years. For this study, EUV radiation is produced by irradiating target materials using a focused...
Show moreWith the availability of high reflectivity multilayer mirrors and zone plate lenses, the EUV region (5nm - 40nm) of the electromagnetic spectrum is currently being explored for applications of nanoscale printing and imaging. Advances made in this area have consequences for many areas of science. Research for producing a compact, bright EUV source for laboratory use has gained momentum in recent years. For this study, EUV radiation is produced by irradiating target materials using a focused laser beam. Focused laser beam ionizes the target to create a hot, dense, pulsed plasma source, where emission is a result of the relaxation of excited levels. Spectroscopy is used as the main diagnostic to obtain the spectral signature of the plasma. Spectral characteristics are used to deduce the physical state of plasma, thus enabling the tuning of laser irradiance conditions to maximize the needed emission bandwidth. Various target materials are studied, as well as different target geometries, with spectroscopy below 200 nm on pulsed micro-plasmas being a particularly daunting task. Total range spectroscopy from 1 nm to greater than 1 micron is completed for tin-doped spherical droplet plasma source. Reliable plasma diagnostics require both accurate measurements and solid theoretical support in order to interpret the experimental results. Using existing 1D-hydrocode, temperature and density characteristics of the expanding plasma is simulated for any set of experimental conditions. Existing atomic codes written for calculating one-electron radial wavefunctions with LS-coupling scheme via Hartree-Fock method is used in order to gain details of the ion stages, populations, transitions, etc, contributing to the spectral data.
Show less - Date Issued
- 2007
- Identifier
- CFE0001972, ucf:47433
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001972
- Title
- TOWARDS THE FINITE: A CASE AGAINST INFINITY IN JORGE LUIS BORGES.
- Creator
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SANTIS, ESTEBAN, Rodríguez Milanés, Cecilia, University of Central Florida
- Abstract / Description
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The role of infinity as an antagonist in Jorge Luis Borges's oeuvre is undeniable. His stories in El jardín de senderos que se bifurcan (1941), Ficciones (1944), and El Aleph (1949) exhibit Borges's tendency to evoke dreams, labyrinths, mirrors, and libraries as both conduits for infinity and sources of conflict. Oftentimes, Borges's characters experience discomfort upon encountering the limitations of secular temporal succession. This discomfort is rooted in Borges's pessimism about the...
Show moreThe role of infinity as an antagonist in Jorge Luis Borges's oeuvre is undeniable. His stories in El jardín de senderos que se bifurcan (1941), Ficciones (1944), and El Aleph (1949) exhibit Borges's tendency to evoke dreams, labyrinths, mirrors, and libraries as both conduits for infinity and sources of conflict. Oftentimes, Borges's characters experience discomfort upon encountering the limitations of secular temporal succession. This discomfort is rooted in Borges's pessimism about the subject which is explored in Borges's most comprehensive essay on the issue of time: "A New Refutation of Time." Consequently, this thesis considers Borges's attitude towards the issue of time as postulated in "A New Refutation of Time" and exhibited in his early fiction, continues to acknowledge infinity as a fundamental conflict in Borges's work, and proceeds to search for a solution to this conflict.The analysis in this thesis relies heavily on a comparative study of the themes and symbols in Borges's fiction in order to establish a pattern wherein infinity is portrayed negatively. More importantly, the use of interviews, biographies, and Borges's own fiction, facilitates the construction of cohesive conception of time in his work. Subsequently, this study looks to establish a solution to the problem of infinity and establish a new pattern wherein there is a positive resolution to the narrative. Ultimately, the goal of this thesis is to acknowledge the problem of infinity in Borges's work and then propose a way to escape it.
Show less - Date Issued
- 2012
- Identifier
- CFH0004237, ucf:44903
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004237
- Title
- Broadband Coherent Perfect Absorption in One-Dimensional Optical Systems.
- Creator
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Villinger, Massimo Maximilian, Abouraddy, Ayman, Dogariu, Aristide, Fathpour, Sasan, University of Central Florida
- Abstract / Description
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Absorption plays a critical role in a variety of optical applications (-) sometimes it is desirable to minimize it as in optical fibers and waveguides, or to enhance it as in solar cells and photodetectors. We describe here a new optical scheme that controllably produces high optical absorption over a broad wavelength range (hundreds of nm) in systems that have low intrinsic absorption over the same range. This effect, 'coherent perfect absorption' or CPA, arises from a subtle interplay...
Show moreAbsorption plays a critical role in a variety of optical applications (-) sometimes it is desirable to minimize it as in optical fibers and waveguides, or to enhance it as in solar cells and photodetectors. We describe here a new optical scheme that controllably produces high optical absorption over a broad wavelength range (hundreds of nm) in systems that have low intrinsic absorption over the same range. This effect, 'coherent perfect absorption' or CPA, arises from a subtle interplay between interference and absorption of two beams incident on a weakly absorbing medium. In the first part of this study, we present an analytical model that captures the relevant physics of CPA in one-dimensional photonic structures. This model elucidates an absorption-mediated interference effect that underlies CPA (-) an effect that is normally forbidden in Hermitian systems, but is allowed when conservation of energy is violated due to the inclusion of loss. As a concrete example, we consider a Fabry-P(&)#233;rot resonator containing a lossy dielectric and confirm this model through a computational study of a 1-micron-thick silicon layer in a cavity formed of dispersive mirrors with aperiodic multilayer design. We confirm that one may achieve 100% absorption in this thin silicon layer (whose intrinsic absorption is only ~ 3%) in the near-infrared. We then design two device models using few-micron-thick aperiodic planar dielectric mirrors and demonstrate (computationally, as well as experimentally) spectrally flat, coherently enhanced absorption at the theoretical limit in a 2-micron-thick film of polycrystalline silicon embedded in symmetric and asymmetric cavities. This coherent effect is observed over an octave-spanning wavelength range of ~800 (-) 1600 nm utilizing incoherent light in the near-infrared, exploiting mirrors that have wavelength-dependent reflectivity devised to counterbalance the decline in silicon's intrinsic absorption at long wavelengths. We anticipate that the design principles established here may be extended to other materials, broader spectral ranges, and large surface areas. Finally, we study the effect of the angle of incidence on CPA in planar structures. The results of this study point to a path for realizing CPA in such systems continuously over large bandwidths.
Show less - Date Issued
- 2015
- Identifier
- CFE0006059, ucf:50985
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006059
- Title
- An Exploratory Mixed Methods Study of Student Awareness in Expressing Emotions and Identifying the Emotions of Others: Through the Mirror Looking Glass.
- Creator
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Duff, Christine, Hines, Rebecca, Dieker, Lisa, Reyes, Maria, Butler, S. Kent, University of Central Florida
- Abstract / Description
-
The goal of this research was to determine how the self-awareness process of expressing emotions and identifying emotions of others was impacted during a mirror-based intervention for first grade students from inclusive classrooms. The study investigated the extent that a two-way mirror display helped eight students increase their level of awareness when expressing emotions and identifying the emotions of others. Traditional assessment measures for assessing empathy and accuracy in perception...
Show moreThe goal of this research was to determine how the self-awareness process of expressing emotions and identifying emotions of others was impacted during a mirror-based intervention for first grade students from inclusive classrooms. The study investigated the extent that a two-way mirror display helped eight students increase their level of awareness when expressing emotions and identifying the emotions of others. Traditional assessment measures for assessing empathy and accuracy in perception of emotions of others have relied on binary, forced choice responses that have not addressed a student's level of awareness, or increased awareness in identifying the emotions of others. Further, binary tests of theory of mind (ToM) and empathy that provide 'either/or' assessment do not account for an individual's level of ToM or empathy in identifying emotions of others, when 100% accuracy is not achieved 100% of the time. A two-way mirror served to provide a real time, real world opportunity for students to examine their own expression of a given emotion, while the student on the non-reflected side simultaneously evaluated the accuracy of that emotion. The accuracy of the projected emotion was evaluated and results indicated an increase in accuracy of expressing emotions. This research study introduced a three choice assessment measure, 'The Emotion Word Assessment (EWA) that provided students choices in identifying their peers' emotion, and was used to assess accuracy and increases in correct choices, with concomitant changes in student own awareness of their emotion expression and the awareness of others' emotions. Constructs of ToM, empathy, cognitive empathy and affective empathy, cognitive processing, compassion, and sympathy were examined and recommendations for future empathy and emotional assessment provided.
Show less - Date Issued
- 2017
- Identifier
- CFE0006737, ucf:51867
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006737
- Title
- Evaluating Improvisation as a Technique for Training Pre-Service Teachers for Inclusive Classrooms.
- Creator
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Becker, Theresa, Hines, Rebecca, Beverly, Monifa, Hopp, Carolyn, Hamed, Kastro, University of Central Florida
- Abstract / Description
-
Improvisation is a construct that uses a set of minimal heuristic guidelines to create a highly flexible scaffold that fosters extemporaneous communication. Scholars from diverse domains: such as psychology, business, negotiation, and education have suggested its use as a method for preparing professionals to manage complexity and think on their feet. A review of the literature revealed that while there is substantial theoretical scholarship on using improvisation in diverse domains, little...
Show moreImprovisation is a construct that uses a set of minimal heuristic guidelines to create a highly flexible scaffold that fosters extemporaneous communication. Scholars from diverse domains: such as psychology, business, negotiation, and education have suggested its use as a method for preparing professionals to manage complexity and think on their feet. A review of the literature revealed that while there is substantial theoretical scholarship on using improvisation in diverse domains, little research has verified these assertions. This dissertation evaluated whether improvisation, a specific type of dramatic technique, was effective for training pre-service teachers in specific characteristics of teacher-child classroom interaction, communication and affective skills development. It measured the strength and direction of any potential changes such training might effect on pre-service teacher's self-efficacy for teaching and for implementing the communication skills common to improvisation and teaching while interacting with student in an inclusive classroom setting. A review of the literature on teacher self-efficacy and improvisation clarified and defined key terms, and illustrated relevant studies. This study utilized a mixed-method research design based on instructional design and development research. Matched pairs t-tests were used to analyze the self-efficacy and training skills survey data and pre-service teacher reflections and interview transcripts were used to triangulate the qualitative data. Results of the t-tests showed a significant difference in participants' self-efficacy for teaching measured before and after the improvisation training. A significant difference in means was also measured in participants' aptitude for improvisation strategies and for self-efficacy for their implementation pre-/post- training. Qualitative results from pre-service teacher class artifacts and interviews showed participants reported beneficial personal outcomes as well as confirmed using skills from the training while interacting with students. Many of the qualitative themes parallel individual question items on the teacher self-efficacy TSES scale as well as the improvisation self-efficacy scale CSAI. The self-reported changes in affective behavior such as increased self-confidence and ability to foster positive interaction with students are illustrative of changes in teacher agency. Self-reports of being able to better understand student perspectives demonstrate a change in participant ability to empathize with students. Participants who worked with both typically developing students as well as with students with disabilities reported utilizing improvisation strategies such as Yes, and..., mirroring emotions and body language, vocal prosody and establishing a narrative relationship to put the students at ease, establish a positive learning environment, encourage student contributions and foster teachable moments. The improvisation strategies showed specific benefit for participants working with nonverbal students or who had commutation difficulties, by providing the pre-service teachers with strategies for using body language, emotional mirroring, vocal prosody and acceptance to foster interaction and communication with the student.Results from this investigation appear to substantiate the benefit of using improvisation training as part of a pre-service teacher methods course for preparing teachers for inclusive elementary classrooms. Replication of the study is encouraged with teachers of differing populations to confirm and extend results.
Show less - Date Issued
- 2012
- Identifier
- CFE0004516, ucf:49273
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004516
