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The heat transfer characteristics of CO₂ and CO₂-oil mixture in tubes
Rin Yun(윤린) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The heat transfer characteristics of CO₂ and CO₂-oil mixture in tubes including convective flow boiling, gas cooling, and condensation are investigated. Two-phase flow patterns are thoroughly investigated based on physical phenomena, which show the early flow transition to intermittent or annular flow especially for small diameter tube. The physical phenomena for nucleate boiling of CO₂ follow the same trends with other organic fluids under the same reduced pressure. The gas cooling heat transfer is critically dependent on the turbulent diffusivity related with buoyancy force due to the large density difference. Under the oil presence conditions, the interaction of oil rich layer and bubble formation is the physical mechanism for the CO₂-oil mixture convective boiling. Besides, the gas cooling phenomena with oil should be investigated based on the flow patterns formed by CO₂ and oil, and the oil rich layer, whose thickness are depends on the solubility of CO₂ to oil explains the physical mechanisms of heat transfer. The thermodynamic properties of CO₂-oil were estimated by the general model based on EOS, and they are utilized to estimate the properties for oil rich layer and oil droplet vapor core. Through these predicted properties, the convective boiling and gas cooling heat transfer coefficients and pressure drop theoretically estimated. Condensation of CO₂ is not so different from the existing one, so the heat transfer coefficients and pressure drop are well estimated by the existing one developed for other fluids.
Kyoung-Yun Kim,Ha-Rin Moon,Jung-Mi Yun 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Metabolic syndrome (MetS) is a complex metabolic disorder and is a high-risk condition for type 2 diabetes and cardiovascular disease. Rapid screening of at-risk individuals using accurate and time-saving tools is effective in disease management. Using the KNHANES data, we collected data of 2,234 subjects suitable for the study design, of which 974 (43.6%) were men and 1,260 (56.4%) were women. We used ROC analysis to estimate the sex-specific neck circumference (NC) optimal cut-off point to predict MetS risk. In addition, in order to analyze the risk of MetS according to the estimated NC, logistic regression analysis was performed by correcting confounding factors. As a result of ROC analysis, the optimal neck cut point for predicting the risk of MetS was in men 38.25 cm (AUC: 0.759, 95% CI: 0.729-0.790) and in women 33.65 cm (AUC: 0.811, 95% CI: 0.782-0.840). In above this neck cut point, the risk of MetS was associated with increasing by 1.872-fold (P=0.004) in men and 4.639-fold (P<0.001) in women. It is suggested that more studies should be conducted to analyze the disease prediction effect of the combined application of anthropometric indicators currently in use and NC.
윤해린 ( Yun¸ Hae Rin ) 한국동양예술학회 2021 동양예술 Vol.52 No.-
This study compares and analyzes the rhythmic composition of the sound read when reciting these Chinese poems in Korea and China how the composition and transliteration and melody is progressed. in the composition of the beat, one syllable and one beat are the common basics in the way to recite Chinese poetry in Korea and China. the two countries also show differences in the way lyrics are composed. In Chinese poetry recitement in China, “composition of lyrics” and melodies are determined according to the four-tone rules of Chinese. it was confirmed that the “composition of lyrics” and the melody were determined by factors such as Hyunto(Korean word attached to the end of a Chinese sentence), context, and musical effect in Korean poetry reciting characteristics. as for the melody composition, the four-tone scale is used in the Korean reciting method of the poetry, but the six-tone scaleis used in the Chinese reciting method of the poetry. And, it was confirmed that the transliteration range is within one octave in Korea and more than one octave in China. in the melodic progression method, common to both Korea and China, it starts with a high note, goes down, goes up and down, and then finishes. In the finishing process, there was a difference of 4 degrees ascending in Korea and a descending termination in China. Through the research process, it could be confirmed that the reciting tone of Chinese poetry in korea was according to the characteristics of Korean language and Korean music, not Chinese linguistic and musical characteristics.