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- Title
- THE EFFECT OF TECHNOLOGY ACCEPTANCE ON POST SECONDARY AFRICAN- AMERICAN STUDENTS' ACHIEVEMENT IN MATHEMATICS:A PATH ANALYTIC INQUIRY.
- Creator
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Sen, Sulakshana, Sivo, Stephen, University of Central Florida
- Abstract / Description
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The purpose of this research was to investigate the effect of technology acceptance on post secondary African American students' achievement in Mathematics. The study was conducted in a historically Black four-year college in Daytona Beach, Florida on students using the computer to enhance their mathematics performance in an introductory algebra mathematics course. By using Technology Acceptance Model (TAM) developed by F. Davis (1989), this study focused on variables such as perceived...
Show moreThe purpose of this research was to investigate the effect of technology acceptance on post secondary African American students' achievement in Mathematics. The study was conducted in a historically Black four-year college in Daytona Beach, Florida on students using the computer to enhance their mathematics performance in an introductory algebra mathematics course. By using Technology Acceptance Model (TAM) developed by F. Davis (1989), this study focused on variables such as perceived usefulness, perceived ease of use, computer self-efficacy, subjective norms, attitude and actual use of the computer to account the effect towards the achievement in the final exam which is an outcome variable. The data were collected over four different time periods during the fall semester of 2004 to find how these results changed over time. The study was conducted by using six instruments to measure perceived usefulness, perceived ease of use, computer self-efficacy, subjective norms, actual use of computer (frequency and duration), attitude and an additional demographic instrument. The data were analyzed by path analysis using multiple regressions (SPSS for windows) to find the contribution of each independent variable to the dependent variable that ultimately predicted the final outcome. Computer self-efficacy and subjective norms were determinants of perceived usefulness and perceived ease of use which in turn determined the attitude of students using computer for enhancing their math score in the final. The findings of path analysis indicated that the research did not support TAM. The results suggested that perceived usefulness is the most significant predictor of perceived ease of use. The duration of actual use of the computer in a single session contributed significantly towards their final score for achievement in mathematics. The students preferred a face-to-face instruction in mathematics by the instructor than interaction with a computer. Additional research endeavors should be devoted to the measurement of system use in different set up with different ethnic background to further analyze students' acceptance or rejection of technology towards their achievement in mathematics.
Show less - Date Issued
- 2005
- Identifier
- CFE0000572, ucf:46435
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000572
- Title
- MEDIA EFFECTS ON BODY IMAGE IN THE CONTEXT OF ENVIRONMENTAL AND INTERNAL INFLUENCES: WHAT MATTERS MOST?.
- Creator
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VanVonderen, Kristen, Kinnally, William, University of Central Florida
- Abstract / Description
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Media effects on body dissatisfaction is a long-studied issue; however, aspects of the research - such as those regarding cultivation theory and its effects on body image - are unclear or incomplete. This study attempts to clarify the relationship between cultivation and body dissatisfaction. Besides cultivation, social comparison theory is also examined because upward comparisons with media images and peers can shape and reinforce body image attitudes as well. Additionally, the study...
Show moreMedia effects on body dissatisfaction is a long-studied issue; however, aspects of the research - such as those regarding cultivation theory and its effects on body image - are unclear or incomplete. This study attempts to clarify the relationship between cultivation and body dissatisfaction. Besides cultivation, social comparison theory is also examined because upward comparisons with media images and peers can shape and reinforce body image attitudes as well. Additionally, the study examines the connection between media and body dissatisfaction by looking at a broader social context - one that includes other social/environmental influences, such as peer and parental attitudes, as well as internal influences such as self-esteem. A sample of 285 female undergraduate students completed media exposure, parental influence, peer influence, and self-esteem measures, as well as internalization of the thin-ideal and body dissatisfaction measures. Overall, the study found that while peer comparisons and self-esteem are associated with internalization of the thin ideal, they are not as powerful as the most significant indicators - media attitudes regarding weight and body shape and media comparisons. Contrastingly, peer comparisons and self-esteem were observed to be the strongest indicators of body dissatisfaction. These findings suggest that cultivation is directly associated with the internalization of the thin ideal. However, the cultivation of media messages may not have a direct effect on body dissatisfaction, as social/environmental influences and the internal variable of self-esteem proved to be the most significant indicators.
Show less - Date Issued
- 2011
- Identifier
- CFE0003995, ucf:48676
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003995
- Title
- Nonlinear dynamic modeling, simulation and characterization of the mesoscale neuron-electrode interface.
- Creator
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Thakore, Vaibhav, Hickman, James, Mucciolo, Eduardo, Rahman, Talat, Johnson, Michael, Behal, Aman, Molnar, Peter, University of Central Florida
- Abstract / Description
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Extracellular neuroelectronic interfacing has important applications in the fields of neural prosthetics, biological computation and whole-cell biosensing for drug screening and toxin detection. While the field of neuroelectronic interfacing holds great promise, the recording of high-fidelity signals from extracellular devices has long suffered from the problem of low signal-to-noise ratios and changes in signal shapes due to the presence of highly dispersive dielectric medium in the neuron...
Show moreExtracellular neuroelectronic interfacing has important applications in the fields of neural prosthetics, biological computation and whole-cell biosensing for drug screening and toxin detection. While the field of neuroelectronic interfacing holds great promise, the recording of high-fidelity signals from extracellular devices has long suffered from the problem of low signal-to-noise ratios and changes in signal shapes due to the presence of highly dispersive dielectric medium in the neuron-microelectrode cleft. This has made it difficult to correlate the extracellularly recorded signals with the intracellular signals recorded using conventional patch-clamp electrophysiology. For bringing about an improvement in the signal-to-noise ratio of the signals recorded on the extracellular microelectrodes and to explore strategies for engineering the neuron-electrode interface there exists a need to model, simulate and characterize the cell-sensor interface to better understand the mechanism of signal transduction across the interface. Efforts to date for modeling the neuron-electrode interface have primarily focused on the use of point or area contact linear equivalent circuit models for a description of the interface with an assumption of passive linearity for the dynamics of the interfacial medium in the cell-electrode cleft. In this dissertation, results are presented from a nonlinear dynamic characterization of the neuroelectronic junction based on Volterra-Wiener modeling which showed that the process of signal transduction at the interface may have nonlinear contributions from the interfacial medium. An optimization based study of linear equivalent circuit models for representing signals recorded at the neuron-electrode interface subsequently proved conclusively that the process of signal transduction across the interface is indeed nonlinear. Following this a theoretical framework for the extraction of the complex nonlinear material parameters of the interfacial medium like the dielectric permittivity, conductivity and diffusivity tensors based on dynamic nonlinear Volterra-Wiener modeling was developed. Within this framework, the use of Gaussian bandlimited white noise for nonlinear impedance spectroscopy was shown to offer considerable advantages over the use of sinusoidal inputs for nonlinear harmonic analysis currently employed in impedance characterization of nonlinear electrochemical systems. Signal transduction at the neuron-microelectrode interface is mediated by the interfacial medium confined to a thin cleft with thickness on the scale of 20-110 nm giving rise to Knudsen numbers (ratio of mean free path to characteristic system length) in the range of 0.015 and 0.003 for ionic electrodiffusion. At these Knudsen numbers, the continuum assumptions made in the use of Poisson-Nernst-Planck system of equations for modeling ionic electrodiffusion are not valid. Therefore, a lattice Boltzmann method (LBM) based multiphysics solver suitable for modeling ionic electrodiffusion at the mesoscale neuron-microelectrode interface was developed. Additionally, a molecular speed dependent relaxation time was proposed for use in the lattice Boltzmann equation. Such a relaxation time holds promise for enhancing the numerical stability of lattice Boltzmann algorithms as it helped recover a physically correct description of microscopic phenomena related to particle collisions governed by their local density on the lattice. Next, using this multiphysics solver simulations were carried out for the charge relaxation dynamics of an electrolytic nanocapacitor with the intention of ultimately employing it for a simulation of the capacitive coupling between the neuron and the planar microelectrode on a microelectrode array (MEA). Simulations of the charge relaxation dynamics for a step potential applied at t = 0 to the capacitor electrodes were carried out for varying conditions of electric double layer (EDL) overlap, solvent viscosity, electrode spacing and ratio of cation to anion diffusivity. For a large EDL overlap, an anomalous plasma-like collective behavior of oscillating ions at a frequency much lower than the plasma frequency of the electrolyte was observed and as such it appears to be purely an effect of nanoscale confinement. Results from these simulations are then discussed in the context of the dynamics of the interfacial medium in the neuron-microelectrode cleft. In conclusion, a synergistic approach to engineering the neuron-microelectrode interface is outlined through a use of the nonlinear dynamic modeling, simulation and characterization tools developed as part of this dissertation research.
Show less - Date Issued
- 2012
- Identifier
- CFE0004797, ucf:49718
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004797