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셀룰로오스 나이트라이트의 합성과 그의 응용(II) -아질산 셀룰로오스의 셀룰로오스에의 재생 및 셀룰로오스 유도체와 PAN과의 블랜딩-
고석원,황현숙,김영호,Go, Seok-Won,Hwang, Hyeon-Suk,Kim, Yeong-Ho 한국섬유공학회 1983 한국섬유공학회지 Vol.20 No.3
The effects of the reaction conditions in nitrosation of cellulose and the regeneration conditions of cellulose nitrite to cellulose on the molecular weight of regenerated cellulose, and the blending of cellulose nitrite or cellulose sulfate with PAN were investigated. The results are as follows. The molecular weight of regenerated cellulose is influenced by nitrosation temperature, nitrosation time and the alkalinity of regenerating liquor. X-ray diffractogram shows that the regenerated cellulose has cellulose II structure. Polyacrylonitrile is miscible with cellulose sulfate to a considerable extent, and the film of their blend is so outstanding in anti-static property that it is considered to be able to produce anti-static polyacrylic fiber.
팔굽혀 펴기 운동 시 지지면 간격에 따른 근 활성도 비교
오현석 ( Hyeon Seok Oh ),김지영 ( Ji Young Kim ),김경은 ( Gyeong Eun Kim ),이다희 ( Da Hee Lee ),유남우 ( Nam Woo Yoo ),최호정 ( Ho Jung Choi ),박평진 ( Pyeong Jin Park ),황현숙 ( Hyeon Suk Hwang ),김은혜 ( Eun Hye Kim ),강동연 ( 대한통합의학회 2013 대한통합의학회지 Vol.1 No.4
Purpose : The purpose of this study was to compare the muscle activities of infraspinatus, serratus anterior, upper trapezius, and triceps brachii in different supporting surface intervals during push-up exercise. Method : Subjects of the study were 18 healthy male students without any orthopedic or neurological injuries including neck and shoulder surgeries and can perform a push-up exercise required for the study. EMG was used to measure the muscle activities of four muscles. Result : There were statistically significant differences of all the muscles in three different supporting surface intervals(p<0.5). Muscle activity of upper trapezius was the highest(MVIC 39.40%) in the narrowest width and the lowest in the widest width. In infraspinatus, muscle activity was the highest(MVIC 36.23%) in the narrowest width and the lowest in the widest width. In serratus, muscle activity is the highest(MVIC 58.04%) in the widest width and the lowest in the narrowest width. In triceps brachii, muscle activity is the highest(MVIC 68.51%) in the widest width and the lowest in the narrowest width. Conclusion : Muscle activities are at the highest with the narrowest width in the upper trapezius and the infraspinatus. In the serratus and triceps brachii, however, muscle activities are at the highest with widest width.