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Peer revies method for teaching EAP composition
이돈,이원굿 팬코리아영어교육학회 1997 영어교육연구 Vol.6 No.1
The purpose of this research is to improve the EAP oriented composition courses in Korean higher education by integrating peer review into the existing curriculum.
이돈,서길수 한국고분자학회 2011 Macromolecular Research Vol.19 No.10
Polymer/clay based composite films were prepared by incorporating sodium montmorillonite (Na^+-MMT) and calcium montmorillonite (Ca^2+-MMT) clay into poly(ethylene-co-acrylic acid) (PEAA). The dispersion of the MMT particles in the PEAA/MMT nanocomposites was examined by transmission electron microscopy (TEM) and X-ray diffraction (XRD). TEM indicated that the mean lateral dimensions of MMT particles in the PEAA/MMT nanocomposites was approximately 300 nm and their thickness was < 20 nm. The PEAA chains were intercalated into the interlayers of MMT. The NH_4^+ ions on the PEAA chains were replaced by Na^+ or Ca^2+ ions in the interlayer of MMT. The mechanical behavior of the PEAA/MMT nanocomposites with different MMT contents was examined using an Instron. The tensile strength increased with increasing MMT content. Since PEAA forms a network by Ca^2+ ions, the tensile stress of the PEAA/Ca^2+-MMT nanocomposites is larger than that of the PEAA/Na^+-MMT nanocomposites with the same MMT content. The thermal properties of the PEAA/MMT nanocomposites were also discussed with reference to the TGA and DTA curves. TGA and DTA confirmed that the presence of Ca^2+ ions allowed the PEAA to form a network.