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합성고무 보강제 Silica 의 화학처리에 관한 연구(2) : Silica Treatment by LBR - MDI MDI 처리 Silica 의 LBR 처리
김홍선,최세영,진재용 한국고무학회 1995 엘라스토머 및 콤포지트 Vol.30 No.3
The reinforcement of inorganic filler silica treated with LBR-MDI in SBR vulcanizates were investigated. The inorganic filler silica treated with MDI on unmodified surface and that of silica treated by MDI was retreated with LBR. The characteristics of vulcanization, physical properties, surface properites and dynamic properties were investigated after mixing those silica with SBR and unmodified silica with SBR. Rheometric studies of the vulcanization showed that S-series has fast scorch time(t_(10)) and an optimum cure time(t_(90)) in the SBR compounds. And it was turned out that SBR vulcanizates compounded with LBR treated silica was better than any other compounds in hardness, tensile strenght, 100-300% modula and elongation. We could confirm that urea bonding is formed from IR spectrum. We concluded that L-series shows the best reinforcement effect in SBR vulcanizates.
金弘善,盧光瑞,南淑賢,崔德瓊 고려대학교 의과대학 1966 고려대 의대 잡지 Vol.3 No.1
The normal lung volumes were determined and subdivided under sitting position in 50 nurse students. All subjects were free of pulmonary and cardiovascular diseases. The vital capacity was measured by McKesson's 'spirometer and the functional residual capacity was determined by Darling's open circuit method. The following results were obtained. 1. The lung volumes determined were: vital capacity 3.1±0.042 l (BTPS), functional residual capacity 2.51±0.049 l (BTPS) and residual volume 1.14±0.029 l (BTPS). 2. The calculated residual ratio (RV/TLC×100) was 26.72±0.53%, and functional residual ratio (FRC/TLC×100) was 55.49±0.55%, and were within the normal range. 3. The correlation coeffcient between vital capacity and total lung capacity was 0.895and total lung capacity was represented by the following regressions equation: Y(TLC)=1.13χ+0.74(l). 4. The correlation coefficients between body surface area, body height and vital capacity were 0.673 and 0.673 respectively. The correlation coefficient between vital capacity and functional residual capacity was 0.564.
韓國人 手掌皮膚 Meissner 小體의 量的 變化에 關한 硏究
金弘善,金武剛,趙聲煥,柳時潤 충남대학교 의과대학 지역사회의학연구소 1983 충남의대잡지 Vol.10 No.2
In order to observe the quantitative changes in Meissner's tactile corpuscles caused by aging and in different areas, 3×5 ㎟ punch excision specimens in the palm of the right and left hand from the 46 cadavers (male 35, female 11) were collected, sectioned serially, stained by the methylene blue and observed with light microscope and then analyzed a numerical changes in the palm of the right and left hand and in the site 6 and 7 in the palm of the hand. The results are summerized as follows: 1. The mean concentration of Meissner's corpuscles in the palm of the right hand was 2.92 per square millimeter and in the palm of the left hand was 5.17. There was appeared the mean concentration of Meissner's corpuscles in the palm of the hand was greater in the left than in the right. 2. In the site 6, the mean concentration of Meissner's corpuscles was 3.93 per square millimeter in the age group 21 to 50 years, 2.96 in the 51 to 60 years, 2.52 in the 61 to 83 years. There was a decrease in the mean concentration of Meissner's corpuscles with increasing age. 3. In the site 7, the mean concentration of Meissner's corpuscles was 5.51 per square millimeter in the age group 21 to 50 years, 4.98 in the 51 to 60 years, 4.94 in the 61 to 78 years. Also, there was a decrease in the mean concentration of Meissner's corpuscles with increasing age. 4. In the site 6, the mean concentration of Meissner's corpuscles in the palm of the right hand was 3.57 per square millimeter in the age group 21 to 50 years, 2.74 in the 61 to 78 years and in the palm of the left hand was 3.07 in the 21 to 60 years, 2.24 in the 61 to 83 years. There was appeared the mean concentration of Meissner's corpuscles in the site 6 of the palm was greater in the right than in the left. 5. In tie site 7, the mean concentration of Meissner's corpuscles in the palm of the right hand was 5.12 per square millimeter in the age group 21 to 78 years and in the palm of the left hand was 5.13 in the 21 to 78 years. There was appeared the mean concentration of Meissner's corpuscles in the site 7 of the palm was a little greater in the left than in the right.