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최호경(Hokyung Choi),김상도(Sangdo Kim),유지호(Jiho Yoo),임정환(Jeonghwan Lim),임영준(Youngjoon Rhim),이시훈(Sihyun Lee) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
This paper describes the potential application of ash-free coal to direct carbon fuel cell (DCFC). DCFC can be made of typical fuel cell components and generates the electric energy by direct electrochemical oxidation of carbon, replacing hydrogen with solid carbon fuel. Carbon is mostly originated from coal, which is readily available, easily transportable, and economical. However, employing coal as a carbon source has been excluded, mainly due to its high ash content. The ash-free coal, produced by solvent extraction of combustibles from raw coal, can be applicable as carbon fuel to DCFC. The successful adaption may cut the fuel cost to one third of usual hydrogen fuel cells. In addition, 80% of power generation efficiency can be achieved and CO₂ emission from the conventional coal-fired power plant can be reduced by 90%.
Hokyung Park,Rino Choi,Byoung Hun Lee,Seung-Chul Song,Man Chang,Young, C.D.,Bersuker, G.,Lee, J.C.,Hyunsang Hwang IEEE 2006 IEEE electron device letters Vol.27 No.8
<P>To understand the intrinsic effect of a hot-carrier injection on high-kappa dielectrics free from concurrent cold-carrier trapping, the authors have investigated a hot-carrier-induced damage with channel hot-carrier stresses and substrate hot-carrier stress. Compared to substrate hot-carrier stress, the channel hot-carrier stress shows a more significant cold-carrier-injection effect. By using a detrapping bias, they were able to decouple the effect of cold-carrier trapping from the permanent trap generation induced by the hot-carrier injection. As channel hot-carrier stress bias was reduced, a portion of cold-carrier trapping increased and a portion of interface trap generation decreased</P>
Choi Hayeon,Kim Hokyung,Kim Ki Tae 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.6
Fluorescent nucleosides play essential roles in designing functional nucleic acid systems for various biological applications. Therefore, expanding the scope of fluorescent nucleosides with unique properties has become an important challenge. Herein, we report novel fluorescent nucleosides constructed by aldol-type condensation between 5-formylpyrimidine and a fluorogenic dye. Two new fluorescent nucleobase analogs (4a and 4c), derived from 2-dicyanomethylene- 3-cyano-4,5,5-trimethyl-2,5-dihydrofuran and a quinolinium moiety, respectively, were determined through reaction screening, and their photophysical properties and formation kinetics were investigated. Among the two, 4a exhibits a unique fluorescence featuring a large Stokes shift (67–117 nm) and high environmental sensitivity, as evidenced by its viscosity-induced fluorescence and aggregationinduced emission behavior. The kinetic study revealed that 4a was readily synthesized even in aqueous solutions with pH 7 (kobs = 6.4 105/s). The overall results indicate that 4a is a promising molecule for use in fluorescent nucleic acid systems, particularly for selective fluorogenic labeling of 5-formyluracil.
테니스 플랫서브시 키네시올로지 테이핑 적용에 따른 어깨뼈의 운동학적 분석
김태규,최호경,Kim, Taegyu,Choi, Hokyung 한국융합학회 2020 한국융합학회논문지 Vol.11 No.9
본 연구는 대학 테니스 선수를 대상으로 플랫서브 동안 어깨관절 충돌 증후군 유무에 따른 어깨뼈 움직임의 차이를 분석하고 어깨뼈 움직임을 조절하는 키네시올로지 테이핑 적용 효과를 확인하고자 하였다. K대학교에서 훈련 중인 15명의 엘리트 테니스 선수를 어깨관절 충돌 증후군(SIS)집단 7명(남자 3명, 여자 4명)과 대조(CON)집단 8명(남자 5명, 여자 3명)으로 분류하였고, 3차원 영상분석을 통해 플랫서브 동안 어깨뼈 움직임을 분석하였으며, 키네시올로지 테이핑 적용 후 어깨뼈 움직임을 재분석하였다. 플랫서브는 5개의 이벤트로 구분하였고, 어깨뼈의 아래쪽(+)/위쪽(-) 돌림, 뒤쪽(+)/앞쪽(-) 기울임 및 안쪽(+)/가쪽(-) 돌림을 수치화하였다. 그 결과, 남자선수의 경우 위팔뼈가 최대 가쪽돌림이 되는 지점과 임팩트 순간에서 SIS집단의 어깨뼈(각각 -7.31±1.19°와 -5.28±1.08°)가 CON집단(각각 -0.98±5.38°와 -0.44±3.52°)에 비해 앞쪽으로 더 기울어져 있었고(각각 Z=-2.309, p=.021와 Z=-2.309, p=.021), 여자선수의 경우 위팔뼈가 최대 가쪽돌림이 되는 지점에서 SIS집단의 어깨뼈(-8.11±2.57°)가 CON집단(-0.97±3.31°)에 비해 앞쪽으로 더 기울어져 있었으나(Z=-2.121, p=.034), 테이핑 적용에 따른 어깨뼈 움직임의 긍정적인 변화는 보이지 않았다. This study aimed to identify the difference of scapular movements between tennis players with and without shoulder impingement syndrome(SIS) and to verify the effect of kinesiology taping applied to scapular. A total of 15 players were categorized in SIS group(n=7) and control(CON) group(n=8). The scapular movements evaluated using 3-dimensional motion analysis in the 5 events of the flat first serve before and after the application of taping. The male of SIS group(-7.31±1.19° and -5.28±1.08°, respectively) had tilted scapular more anteriorly compared to CON group(-0.98±5.38° and -0.44±3.52°, respectively) at the maximally humeral external rotation and the impact(Z=-2.309, p=.021 and Z=-2.309, p=.021, respectively). The scapular(-8.11±2.57°) of female in SIS group tilted more anteriorly than that of CON(-0.97±3.31°) group at the maximally humeral external rotation(Z=-2.121, p=.034). But the scapular movements had no statistical differences between before and after the application of taping.