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Poly(Urethane Acrylate) Siloxane Oligomer를 이용한 플라스틱 디스플레이 기판용 UV 하드코팅 용액의 합성
백성균,장선호,유성식,조을룡 한국반도체디스플레이기술학회 2017 반도체디스플레이기술학회지 Vol.16 No.3
Poly(urethane acrylate) siloxane oligomers with Interpenetrating polymer networked nanoparticles were prepared to synthesize hard coating solution by reaction with isophorone diisocyanate(IPDI) of 1, 2, 3, 4 phr. The structures and molecular weights of the synthesized solutions were characterized by IR spectroscopy and gel permeation chromatography, respectively. In the cross-cut test for the adhesion, all the solutions showed good adhesion of 5B regardless of the content of IPDI and film thickness. The addition of 1 phr IPDI resulted in the best pencil hardness. The IPDI combined siloxane hard coating solution showed more flexibility than the siloxane solution. These results will yield the improvement in the siloxane solution using for plastic display plate.
백성균,장선호,조을룡 한국반도체디스플레이기술학회 2017 반도체디스플레이기술학회지 Vol.16 No.1
Poly(urethane acrylate) siloxane oligomers with Interpenetrating polymer netwoked nanoparticles were prepared to synthesize hard coating solution by reaction with diisocyanates. The diisocyanate combined siloxane hard coating solution showed more flexibility than the siloxane solution. In addition, diisocyanate resulted in improvement of curl property and surface hardness in the siloxane solution. Of the used diisocyanates, isophorone diisocyanate and acryloyloxy ethyl diisocyanate were good for UV hard coating solution. This effect will decrease brittleness in the siloxane solution using for plastic display plate.
김갑선,백성균 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.20 No.1
The purpose of this study is, through the kinematic analysis of the instep kick motion, to provide scientific data for coaches and athletes related with soccer. The subjects of this study were selected twelve students of junior high school(skilled group:3, unskilled group:3). Five trials were sampled with two high speed video cameras for each subjects at 60fields/s, but only one was selected for analysis. The DLT method was used to obtain the 3-dimensional coordinates of the body landmarks. The recorded images was digitized with Kwon3D Motion Analysis Package (Version 2.1). The conclusions were as follows ; 1. The elapsed time of skilled group was longer phase 1 than phase 2. There is no significant difference between phase 1 and phase 2 to unskilled group. And the strides of the skilled group showed smaller than unskilled group. 2. The velocity displacement of skilled group showed effectively from thigh joint to shank joint, from shank joint to ankle joint. 3. To take more poweful kick, skilled group increased joint velocity of kicking leg. However, unskilled group increased the horizontal velocity of the center of gravity. 4. The angle of the upper parts of trunk of skilled group was smaller than unskilled group at the whole phase. Especially, skilled group maintained the angle of the upper parts of trunk from E2 to E3. Differently, angle of unskilled group was increased at phase 2. 5. The minimum value of knee joint angle of skilled group was 62.23±9.08, comparing with 67.20±6.10 of unskilled group. Which is significant factor that skilled group takes more powerful instep kick. 6. At the whole phase, the ankle joint angle of skilled group showed larger than unskilled group. Taking a smaller angle than unskilled group, skilled group resisted tendency of rising above the air.