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폴리스티렌 기반 유기 라디칼 공중합체의 합성과 전지특성
양의석,류상욱,Yang, Eui-Seok,Ryu, Sang-Woog 한국전기화학회 2016 한국전기화학회지 Vol.19 No.4
본 실험에서는 2,2,6,6-tetramethyl-4-piperidyl methacrylate(TMA)와 합성된 스티렌 계열의 2,2,6,6-tetramethylpiperidine-4-vinylbenzyl ether(TVBE)으로 구성된 단독 및 공중합체를 합성하였으며 산화반응을 이용하여 고분자 라디칼로 변환시켰다. 제조된 고분자 라디칼은 카본블랙, 바인더와 함께 혼합되어 알루미늄 극판에 코팅되었으며 코인셀로 구성하여 전지특성을 평가하였다. 그 결과, 폴리스티렌 기반의 중합체는 폴리메타크릴레이트 기반의 재료에 비해 낮은 산화반응성과 낮은 방전용량을 보여주었다. 하지만 $60^{\circ}C$의 고온에서 실시된 방전실험에서는 폴리스티렌 기반에서 더욱 우수한 방전특성을 나타났다. 또한 예상대로 고분자 라디칼로 구성된 전지에서 우수한 율특성을 확인할 수 있었다. In this study, homo and copolymers of 2,2,6,6-tetramethyl-4-piperidyl methacrylate(TMA) and synthesized styrene derivative, 2,2,6,6-tetramethylpiperidine-4-vinylbenzyl ether(TVBE) were obtained by radical polymerization and oxidized to produce corresponding polymer radicals. The polymer radicals were mixed with carbon black, binders and coated onto Al current collector. The battery performance is then characterized by fabricating coin cells. As results, the polystyrene based organic radicals show lower oxidize efficiency and discharge capacity than methacrylate based one. However, the former shows better capacities from discharge experiments performed at $60^{\circ}C$ which suggests a possible way to overcome the high temperature fade out of performance in usual organic radical batteries. Also as expected, an excellent C-rate performance is observed in all the cells consisted of organic polymer radicals.
실리카가 첨가된 PEHA/PS 코어-쉘 압력가소성 고분자의 합성
양의석 ( Eui Seok Yang ),김유진 ( Yu Jin Kim ),이상석 ( Sang Seok Lee ),류상욱 ( Sang Woog Ryu ) 충북대학교 산업과학기술연구소 2011 산업과학기술연구 논문집 Vol.25 No.2
Baroplastics are defined as polymer with pressure induced miscibility under an applied pressure at lower temperature than thermal processing. In this study, nanoparticles of poly(ethylhexyl acrylate) and polystyrene core-shell were synthesized by two stage emulsion polymerization and silica nanoparticles were incorporatedthrough the quantitative electrostatic precipitation process. The baroplastic processing behavior was investigated by compression molding at room temperature and it was found that there is a strong composition dependence of polystyrene and silica on the compression molding. As a result, well processed specimens was obtained from the composition of 54 wt% of polystyrene and 30 wt% of silica,
녹화 영상 분석을 통한 일개 권역 응급의료센터에서 시행된 심폐소생술의 질에 관한 고찰
양의석,정원준,조성욱,조용철,유연호,이준완,유승 대한응급의학회 2015 대한응급의학회지 Vol.26 No.6
Purpose: Maintaining the quality of CPR is connected with improvement in survival rates, but CPR performance in the field does not always fulfill the guidelines. Therefore, many ways to obtain the quality of CPR have been studied and tried, including CPR education, manikin training, mechanical CPR, audio-visible feedback system, and video-recording system, et cetera. The aim of our study is to determine how CPR procedures are actually performed on the scene by real-time video recording. Methods: Digital video of CPR cases was obtained from April 2014 to March 2015 in a wide regional emergency medical center. The video was analyzed by two physicians in the emergency department. We evaluated quality of major CPR variables including compression rate, hands-off time, chest compression fraction, ventilation rate, et cetera. Results: A total of 52 cases were analyzed. Mean chest compression rate was 122.43±10.74/min, and mean ventilation rate was 7.47±2.58/min. Performance of adequate compression-to-ventilation ratio before insertion of advanced airway was 37%. Mean recognition to compression time was 31.31±27.32 seconds, and proportion of chest compression interruption time exceeding 10 seconds was 7.6%. Mean chest compression fraction was 91.12± 0.4%. In five out of 25 cases of defibrillation, chest compression was interrupted during charging, resulting in prolongation of chest compression interruption time. Conclusion: In this study, overall performance met the qualification of AHA guidelines. However, poor compliance was observed for some parameters. Continuous education and feedback are required in order to make an improvement in these areas.