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The Effects of Task Types on English Writing Performance in SNS-based Learning Environments
Jang Eunjee,Kim Jieyoung 한국영어어문교육학회 2012 영어어문교육 Vol.18 No.2
The purpose of this study was to investigate the impact of two different SNS-based tasks on university students’ English writing performance. To address our primary research question, Me2day, microblogging and Social Networking Service, was employed. 43 university students were divided into two experimental groups depending on the task types: a comparison task group and a sharing personal experiences task group. The main findings of the study were as follows: first, two different types of SNS-based tasks, ‘spot the differences’ and ‘writing diaries’, had a positive effect on learners’ writing performance. The reason for this was that the succinct messages limited to 150 characters made it easier for the students to try writing in English without burden; and they may benefit from their peers by seeing their posts and interacting with each other. Yet there were no significant differences between the two groups when it came to the degree of improvement. Second, two different types of SNS-based tasks differently fostered certain aspects of the writing performance; ‘contents knowledge’ was supported by the ‘writing diaries’ task and range was supported by the ‘spot the differences’ task. Third, learners in the two experimental groups mostly had positive impressions regarding usage of Me2day as a new learning tool.
Uses of Smartphone Apps for English Listening Practice
( Eunjee Jang ),( Jie Young Kim ) 글로벌영어교육학회(구 호남영어교육학회) 2015 Studies in English education Vol.20 No.1
With the advent of mobile assisted language learning, learning (MALL), learning is taking place anytime, anywhere, and its informal and personal aspects are receiving attention in academic circles. This qualitative study explored the personalized language learning experiences of learners who used smartphones for daily listening practice. Particularly, we focused on how learners engage in English listening practice and what listening strategies they use. Fifteen Korean university students participated in MALL activities with a variety of apps. Focus group interviews were conducted with five students to understand how students used smartphone apps for listening practice. The analysis of qualitative data indicated that the mobility of smartphones helped the students fully utilize the flexibility of time and place. Although the issue of partial attention was brought up regarding the process of learning, we looked at the possibility of learning as a habitual practice. The other significant finding is that students were very keen to authenticity, and this influenced their choice of listening apps. Finally, the students enjoyed extensive practice in listening, but passively used listening strategies.
Design and Fabrication of High-Performance Liquid Crystal Gratings
Yu, Chang-Jae,Jang, Eunje,Lee, Sin-Doo,Kim, Hak-Rin TaylorFrancis 2006 Molecular Crystals and Liquid Crystals Vol.454 No.1
<P> We present basic principles of designing and fabricating high-performance liquid crystal (LC) gratings with binary alignment structures which produce a variety of the diffraction properties. The periodic binary structure in the LC layer was fabricated through a selective irradiation of the UV light using the single-masking process. An alternating homeotropic and hybrid alignment configuration produces the input polarization-dependent diffraction suitable for the polarization-separating devices while an oppositely twisted binary alignment configuration gives the input polarization-insensitive diffraction. It is found that a dye-doped bidirectional alignment configuration can be used for obtaining optically controllable polarization properties.</P>
Chondroitin Sulfate-Based Biomineralizing Surface Hydrogels for Bone Tissue Engineering
Kim, Hwan D.,Lee, Eunjee A.,An, Young-Hyeon,Kim, Seunghyun L.,Lee, Seunghun S.,Yu, Seung Jung,Jang, Hae Lin,Nam, Ki Tae,Im, Sung Gap,Hwang, Nathaniel S. American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.26
<P>Chondroitin sulfate (CS) is the major component of glycosaminoglycan in :connective tissue. In this study, we fabricated methacrylated PEGDA/CS-based hydrogels with varying CS concentration (0, 1, 5, and 10%) and investigated them as biomineralizing three-dimensional scaffolds for charged ion binding and depositions. Due to its negative charge from the sulfate group, CS exhibited an osteogenically favorable microenvironment by binding charged ions such as calcium and phosphate. Particularly, ion binding and distribution within negatively charged hydrogel was dependent on CS concentration. Furthermore, CS dependent biomineralizing microenvironment induced osteogenic differentiation of human tonsil-derived mesenchymal stem cells in vitro. Finally, when we transplanted PEGDA/CS-based hydrogel into a critical sized cranial defect model for 8 weeks, 10% CS hydrogel induced effective bone formation with highest bone mineral density. This PEGDA/CS-based biomineralizing hydrogel platform can be utilized for in situ bone formation in addition to being an investigational tool for in vivo bone mineralization and resorption mechanisms.</P>
Kim, Hak-Rin,Jang, Eunje,Kim, Jiyoon,Joo, Kyung-Il,Lee, Sin-Doo The Optical Society 2012 Applied Optics Vol.51 No.36
<P>We present a dynamic polarization grating based on a dye-doped liquid crystal cell that is controllable by a single pump beam in a binary homeotropic-planar configuration produced through selective rubbing. Upon single pump beam irradiation, the azo dyes in the liquid-crystal (LC) layer diffuse and adsorb onto the planar LC-anchoring surface due to trans-cis photo-isomerization. It is found that the dynamic polarization grating effect results mainly from the photo-induced easy axis reorientation by the amount of dye molecules adsorbed on the planar LC-alignment surface in a single-beam control scheme. The initial LC-anchoring conditions and the dynamic behavior of the dye adsorption strongly influence the repetitive writing-erasing processes by the single pump beam.</P>