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이중기,박달근 한국화학공학회 1987 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.25 No.1
내경이 7.62×10^(-2)m 인 유동층을 사용하여 저질탄 회재 및 모래입자에 대해 최소 유동화 속도를 측정하였다. 실험온도 범위는 15-700℃이고, 입자의 크기는 0.21-2.38㎜사이의 3개의 좁은 범위와 저질탄의 유동층 연소에서 층내에 존재할 수 있는 4.76㎜ 이하 및 0.59㎜이하인 2개의 광범위한 입자범위를 선택하였다. 작은 입자의 최소 유동화 속도는 온도가 증가함에 따라 감소하고 큰 입자(2㎜ 이상)의 경우는 온도가 증가함에 따라서 최소 유동화 속도가 증가하는 것이 확인되었다. 따라서 실험에서 구한 최소 유동화 속도의 측정값과 기존식으로 부터 구한 계산치를 비교할 때 근본적인 차이가 있었다. 따라서 기존식들보다 저질탄 회재의 최소 유동화 속도를 잘 나타내고 있는 변형된 Eugun식을 제시하였다. Minimum fluidization velocity(U_(mf)) of low-grade anthracite ash and sand particles were measured at temperatures ranging from 15 to 700℃ in a fluidized bed of 7.62 × 10^(-2)m ID. Two different series of particle size were used: three narrowly sized cut ranging from 0.21 to 2.38 ㎜, and two of wide size distribution. It was confirmed that U_(mf) for small particles decreases with the increase of temperature but U_(mf) of large particles(>2㎜) increases with temperature. However, experimental values of U_(mf) for low-grade anthcite ash differed significantly from those of calculated from existing correlations in the literature. Therefore a modified Ergun equation which gives much better correlation is suggested here.
이중기 한국수자원학회 1976 한국수자원학회논문집 Vol.9 No.1
To study influences on the downstream, and the Gunsan harbor by setting up estuary of the Gumgang, available data which were collected from the measuring stations which were established within the river basin of which results attained are as follows: 1. The discharge can be calculated as the relationship between the discharge and precipitation in the basin is $R=4{\times}10^{-4}p^2$ or R=P-600 2. The discharge flow in to small resevoirs in the basin can be estimated as $QR=QS\frac{PR-600}{PS-600}(\frac{AR}{AS})$ 3. This daily average discharge at Kongju is 31% less than the during maximum probable discharge and that in Okcheon is 48% less than the daily maximum probable flood. 4. The maximum probable flood from the small stream in the basin can be estimated by a $Q=82.45A^{0{\cdot}464}$ 5. Sediments can be computed with Qs (suspended load)=1.41 $Q^{1{\cdot}42}$ and Qb (bed load)=165.2 $Q^{0{\cdot}705}$. 6. By setting up the specific estuary the tidal movement will be reduced to 93.6% on the average and the sedimentation is reduced to 96.0%. Upon review of overall analysis, the dead wate level of estuary of Gumgang will completely sedimented in next 30 years, therefore, the dredging work at Gunsan harbor is reduced to 73.6%, it is considered that life length will be extended about 52years taking account the existing condition.
이중기 한국농공학회 1978 한국농공학회논문집 Vol.20 No.2
The objeative of this study is to study how to rapidly convert tidal land into cultivable land. The study of a rapid, reasonable desalinization method is conducted at Namyang tidal land which represents soil texture of tidal lands along the south west costa larea of Korea. Therefore, Researches were made at many Pilots in order to find a way of high efficiency of leaching with simpler facilities and cheaper costs. The results of study are briefly summarized as follaws: 1. Subdrainage efficieny is 35%. This is a Poorly drained area, and needs longer leaching desalinization period. 2. The efficieny of desalinization in P.V.C 16 meters plot is the same as that of mole drainage 2 meters plot. P.V.C 4 meters plot has desalinization effect as much as two times compared to P.V.C 16 meters plot. 3. Because the soil texture is silty-clay, desalinization in non-treated plot of sub-drainage and surface drainage desalinization take three times longer period in comparision with P.V.C 4 meters plot. 4. As to the desalinization rate of soluble salt in the soil, the efficieny of desalinization of the topsoil in P.V.C plots was 50% higher than that of mole drainage plot and about 170% higher than that of non-treated plot. In the deep soil salt accumulation at topsoil was observed in non-treated and mole drainage plots, but efficiency in P.V.C polt is about 40 times as high as that of mole drainage and non-treated plot. 5. As to the results of use gypsum and lime as sub-drainage soil improver, gypsum was 60% more efficieny than lime in the continuously inundated plot and 44% in the intermittently inundated plot. The efficieny of gypsum and lime in the intermittently flooded plot is 35% and 42% higher than that of continuously flooded plot reapeaticee1y.
吸煙이 健康人의 心筋收縮力및 酸素消耗量에 미치는 影響의 非觀血的 評價
李重基,朴熙明 慶北大學校 醫科大學 1980 慶北醫大誌 Vol.21 No.1
吸煙이 心力係數 및 心筋酸素消耗量에 미치는 영향을 관찰하기 위하여 건강한 남자 50例에서 卷煙 2개피의 吸煙前後의 心力係數, PRP, TP 및 TTI를 비교하였던바 心力係數는 吸煙前 유의한 변화가 없었으나 PRP, TP 및 TTI는 다 같이 吸煙後에 유의하게 증가하였다. 이러한 성적으로 미루어보아 吸煙은 건강인의 心筋酸素消耗量을 증가시키되 心筋의 收縮力에는 영향을 미치지 않는 것으로 생각된다. The acute effects of cigarette smoking on myocardial contractility and oxygen consumption were studied by noninvasive means in 50 healthy males. Parameters measured in this study were index of myocardial contractile strength and indices reflecting myocardial oxygen consumption: namely, tension time index, triple product, and pressure rate product. All the participants refrai ned from smoking at least one hour prior to the experiment. and then were asked to smoke two cigarettes successively inhaling as deeply as possible every five seconds. The filter-tipped cigarette used in this study weighed about 0.75 gram (excluding the filter), and contained 1.9 percent of nicotine and 13.2 percent of tar. The smoking produced significant increases in tension time index, triple product and pressure rate product, which resulted from increases in both blood pressure and heart rate. However, there was no significant changes in index of myocardial contractile strength. These results suggest that cigarette smoking increases myocardial oxygen consumption without increasing myocardial contractility.