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강형석(H.S. Kang),김연식(Y.S. Kim),전형길(H.G. Chun),송철화(C.H. Song) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.2
A CFD benchmark calculation for a steam blowdown test was performed for 30 seconds to develop the methodology of numerical analysis for the thermal mixing between steam and subcooled water. In the CFD analysis, the grid model simulating the sparger and the IRWST pool were developed by the axisymmetric condition and then the steam condensation phenomena by a direct contact was modelled by the so-called condensation region model. Thermal mixing phenomenon in the subcooled water tank was treated as an incompressible flow, a free surface flow between the air and the water, a turbulent flow, and a buoyancy flow. The comparison of the CFD results with the test data showed a good agreement as a whole, but a small temperature difference was locally found at some locations. The commercial CFD code of CFX4.4 together with the condensation region model can simulate the thermal mixing behavior reasonably well when a sufficient number of mesh distribution and a proper numerical method are adopted.
증기제트 응축으로 유발된 난류제트의 유동특성 예측 상관식 개발
강형석(Hyung Seok Kang),김연식(Y. S. Kim),윤영중(Y. J. Youn),송철화(C. H. Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
An experimental research was performed to develop an empirical correlation of the turbulent water jet induced by the steam jet through a single hole in a subcooled water pool. A moveable pitot tube including a thermal couple was used to measure a local velocity and temperature of the turbulent water jet. The experimental results show that the velocity and the temperature distributions agree well with the theory of axially symmetric turbulent jet. The correlation predicting the maximum velocity of the turbulent jet was modified from the previous correlation and a new correlation to predict the characteristic length was developed based on the test results.
李圭澤,權五鉉,金庚植,南相哲,金東洛,金相煜,郭然植,金聖倍,韓龍燮,金源准 慶北大學校 1960 論文集 Vol.4 No.-
A relationship between the amount of dietary fat, the concentration of serum lipids and the development of coronary heart disease has been one of the most important medical problems in the recent years. Accumulated data indicate that striking differences exist among different populations in the incidence and severity of coronary heart disease and these differences tend to correlate with dietary factors rather than with racial or other factors. Extensive studies on healthy peoples in various parts of the world lead to the conclusion that the incidence of coronary heart disease is directly to related the average level of serum cholesterol and this cholesterol level is directly related to the percentage of calories provided by fats in the diet, particularly common saturated fats of meats and dairy products. Such a study has never been carried out in Korea and studies in other countries of the Far· East have indicated that their diets are extremely low in the fat content and their serum cholesterol and frequency of the coronary heart disease are also remarkably low. In an attempt to correlate the dietary fat intake, blood lipid level and the Incidence of coronary heart disease in Korean people, the following population groups are selected. 319 farmers, 100 Taegu City people, 50 upper class people, 129 Buddhist Monks, and 90 Korean soldiers attached to the United States Army who have been fed American diet for from 1 to 18 months and 60 American soldiers and officers. On all of those people an analysis of dietary constituents, complete blood lipid analysis including total and free cholesterol, cholesterol ester, total esterified fatty acid . lipid phosphorus, neutral fat. C/P ratio and cholesterol ester/total cholesterol ratio and 12 leads electrocardiogram for evidences of the coronary heart disease were performed and the data thus obtained were analyzed and correlated. The most striking difference in diets of various groups is the fat content. The fat intake of Buddhist Monks and farmers is significantly lower than any other groups and their serum lipid level and the incidence of abnormal electrocardiogram are also lowest in the whole groups. Among Koreans upper class people of Taegu city have the highest fat intake and also the highest serum lipid level and the incidence of abnormal electrocardiogram. The dietary fat intake of Korean is significantly lower than that of American and the serum lipid level and the incidence of coronary heart disease are also significantly lower than American. The results of current study indicate that there is direct correlation between the dietary fat intake, the serum lipid level and the incidence of coronary heart disease and it seems to be reasonable to conclude that among many factors which may affect the remarkably low incidence of the coronary heart disease in Koreans the low dietary fat intake is the most important factor.
김연식 한국수학교육학회 1974 수학교육 Vol.12 No.2
Matroid theory, which was first introduced in 1935 by Whitney[2], is a branch of combinational mathematics which has some very much to the fore in the last few years. H. Whitney had just spent several years working in the field of graph theory, and had noticed several similarities between the ideas of independence and rank in graph theory and those of linear independence and dimension in the study of vector spaces. A matroid is essentially a set with some kind of 'independence structure' defined on it. There are several known results concerning how matroids can be induced from given matroid by a digraph. The purpose of this note is to show that, given a matroid M_0(N) and a digraph Γ(N), then a new matroid M(N) is induced, where A⊆N is independent in M(N) if and only if A is the set of initial vertices of a family of pairwise-vertex-disjoint paths with terminal vertices independent in M_0(N).
김연식 한국수학교육학회 1972 수학교육 Vol.10 No.2
We consider the class ∏_k of all k-degenerate graphs, for k a non-negative integer. The class ∏_0 and ∏₁ are exactly the classes of totally disconnected graphs and of forests, respectively; the classes ∏₂ and ∏_5 properly contain all outerplanar and planar graphs respectively. The advantage of this view point is that many of the known results for chromatic number and point arboricity have natural extensions, for all larger values of k. The purpose of this note is to show that a graph G is (P³)-realizable if G is planar and 3degenerate.