• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.4
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• pp.539-544
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• 2006

This study is to apply a modal analysis for a frame and roller of a treadmaill machine. A finite element model was developed to compute natural frequencies of a frame and a roller. This analysis were performed under several different conditions such as weight, boundary, and maxium stress/strain conditions.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.782-787
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• 2005

The bottom structure of an instrumented capsule is a part which is joined at the receptacle of the flow tube in the reactor in-core. A geometrical change or the bottom structure has an effect on the pressure drop and the vibration of the capsule. The out-pile test to evaluate the structural Integrity of the material capsule called 04M-l7U was performed by using a single channel and a half core test loop. From the pressure drop test, the optimized diameter of the cone shape's bottom structure which satisfies HANARO's flow requirement (19 6 kg/s) is 71 mm. The maximum displacement of the capsule measured at the half core test loop is lower than 1.0 mm. From the analysis results, it is found that the test hole will not be interfered with near the flow tubes because its displacement due to the cooling water is very small at 0.072 mm. The fundamental frequency of the capsule under water is 9.64 Hz. It is expected that the resonance between the capsule and the fluid flow due to the cooling water in HANARO's In-core will not occur. Also, the new bottom structure of a solid cone shape with 71 mm in diameter will be applicable to the material and special capsules in the future.

• The Korean Journal of Zoology
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• v.18 no.3
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• pp.141-146
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• 1975

The purposes of this study were to investigate the frequencies of acatalasemia and hypocatalasemia in Korean population to compare with those of Japanese, Chinese and chiefly Taiwan population. The results obtained were as followings; 1. In south area of Korea, Jeonju, Gwangju, Busan and Daegu, a total of 3,629 individuals were tested. No acatalasemia was found but 0.26% of hypocatalasemia in Jeonju, 0% in Gwangju, 0.21% in Busan and 0.06% in Daegu were found. 2. The frequency of hypocatalasemia in south area of Korea was found to be lower than in middle area. 3. The frequency of hypocatalasemia in this study was similar to that of Chinese(in Taiwan) and higher than that of Japanese. 4. The reason of the geographical differences in the freqency of the hypocatalasemia was considered to be due to the natural selection. And the reason of the higher frequency of Korean population living in Japan was considered that originally the frequency of Korean population is higher, and the maintenace of this higher degree is obliged to the assortative mating beteen them.