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College of Pharmacy, Chungnam National University
지현석,Yong-An Kim 국민체육진흥공단 한국스포츠정책과학원 2016 International Journal of Applied Sports Sciences Vol.28 No.1
This study analysed the influence of a 4 week combined weight bearing circuit exercise program in the body composition, physical fitness, and blood profile of an perimenopausal women (aged from 40 ~ 60, N = 29). Significant improvements were found in blood related parameters, fat-related parameters in body compositions and physical fitness parameters (P<0.01). As skeletal muscle mass (SMM) and lean % Dual-energy X-ray absorptiometry (DXA) considered as a standard for muscle mass in this study are used because each standard showed significant differences (P<0.01) and each standard significantly correlated with SMM, weight, time to exhaustion, fat-related parameters such as fa t% DXA, lean % DXA and free fatty acid in pre and post exercise. Blood-related parameters (creatinine, glucose, HDL-cholesterol, and total protein) significantly correlated with changes in each corresponding blood-related parameter after exercise (P=0.000). Exercise contributed to improving muscle mass-related parameters used as biomarkers in this study, which improved the positive changes of healthy indices are indispensable factors for evaluating the effects of exercise. These changes contribute to a virtuous cycle, which accelerates the capacity to perform exercise. It suggests that the weight-bearing circuit exercise can improve the quality of life of perimenopausal women.
화염법으로 제조된 TiO<sub>2</sub> 나노분말의 결정구조에 미치는 화염가스 유량의 영향
지현석,안재평,허무영,박종구 한국분말야금학회 2003 한국분말재료학회지 (KPMI) Vol.10 No.6
$TiO_2$ nanopowder has been synthesized by means of the flame method using a precursor of titanium tetraisopropoxide (TTIP, Ti$(OC_3H_7)_4)$. In order to clarify the effect of cooling rate of hot flame on the formation of $TiO_2$ crystalline phases, the flame was controlled by varying the mixing ratio and the flow rate of gases. Anatase phase was predominantly synthesized under the condition having the steep cooling gradient in flame, while a slow cooling gradient enabled to form almost rutile $TiO_2$ nanopowder of above 95%.
원자짝 분포함수를 이용한 순수 C3S 경화체의 고온 노출 시 나노 구조에 관한 연구
지현석 ( Jee Hyeonseok ),서형원 ( Suh Heongwon ),박태훈 ( Park Taehoon ),배성철 ( Bae Sungchul ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
When the cement paste in concrete is exposed to high temperatures, the mechanical performance decreases due to a series of reactions inside the cement. In this study, we investigated the change of nanostructure of C3S when C3S was exposed to high temperature using pair distribution function (PDF) based on high energy X-ray scattering. As a result of X-ray diffraction, there was no significant difference when C3S was heated at 300℃, but most of Ca(OH)2 was decomposed into CaO at 500℃. In addition, it was confirmed that CaO is dominant in the nanostructure when C3S is heated to 500°C.