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Cosmological Scale과 Atomic Scale의 相互 關聯性
金敬益,李時雨 경북대학교 과학교육연구소 1979 科學敎育硏究誌 Vol.3 No.-
Physical laws and quantities derived from the observed macroscopic universe and microscopic atomic structure are compared with each other for the purpose of examining the interrelation between cosmological and atomic scales. The numerical ratios are derived for some parameters as follows;(ⅰ) effective force ranges between intergalaxies and of nucleus (ⅱ) radius of the universe and atom. In these calculations, the present results are found to be about 10^3 times smaller than Dirac's results. By appling the relationship between nuclear radius and mass number to the universe, the theoretical radius of the universe is obtained to be 6.5×10^27㎝ which is three times smaller than that derived from the assumption of the bound universe. These results suggest that there are some structural similarities between the two extreme scales, and that microphysical approach to the cosmology is valuable to a certain extent.
安炳鎬,金敬益 경북대학교 1978 논문집 Vol.10 No.-
There are many kinds of galactic classification schemes, but none of these shows a clear evolutionary sequence of galaxies. In order to examine possible evolutionary sequences, the published classification schemes were compared with each other, and particularly the properties of SO and Irregular galaxies were examined. From the comparision of the well known four classification schemes and observed properties of galaxies, a new classification scheme which suggests three possible evolutionary sequences is presented; that is, Irregular S evolves to SO galaxies either through normal spirals and anemic spirals or through barred spirals and anemic spirals, and Irregular E evolves to elliptical galaxies directly. In this new galactic classification scheme two new types of galaxies are introduced to make the continuity of classification sequence. One of these is Irregular E, which is considered as an incipient type of elliptical galaxies and the other type is Irregular S, which is considered as the beginning type of spiral galaxies. These two galactic types, which are considered as a little evolved stage from protogalaxy, are different from the ordinary irregular types of Hubble, Sandage and de Vaucouleurs, and also their initial physical conditions are different from each other.
安炳鎬,金敬益 慶北大學校 1978 論文集 Vol.25-26 No.-
Tidal energy gains of a star cluster moving along various orbits around the galaxy were examined by many authors. In this paper, we derive the expression for the tidal energy gain taking account of the effects of a two- body orbit and internal motion of the cluster. (ⅰ) We show that the expression obtained for the gain of internal energy of a star cluster on the assumption of impulsive approximation does not differ from that obtained by Spitzer for the uniform rectilinear motion within a factor of 2. (ⅱ) We derive the expression for the tidal energy gain of a star cluster more explicitly in the case of slow encounter.
Kyung Yeub Nam,Ki Ho Chang,Kyung Eak Kim,Sung Nam Oh,Young Jean Choi,Kyung Sik Kim,Dong In Lee,Kum Lan Kim 大韓遠隔探査學會 2008 大韓遠隔探査學會誌 Vol.24 No.1
Rainfall data from three different types of rain gauge system have been collected for the summertime rain event at Mokpo in the Korean peninsula. The rain gauge system considered in this paper is composed of three tipping-bucket rain gauges with 0.1, 0.2, and 0.5 mm measuring resolutions, the Optical Rain Gauge (ORG), and the PARSIVEL (PARticle Size and VELocity). The PARSIVEL rainfall rate has been considered as the reference for comparison since it gave good resolution and performance on this event. Comparison with the PARSIVEL rainfall rate gives the results that the error and temporal variation of rainfall rate are simultaneously reduced with increasing the averaging interval of rainfall rate or decreasing the size of tipping bucket. This suggests that the estimated rainfall rate must be optimized, differently for the type of tipping-bucket rain gages, by minimizing the averaging interval of rainfall rate under the condition satisfying the given performance of rainfall rate.