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자라에 있어서 Catecholamine이 유리지산대사(遊離脂酸代謝)에 미치는 영향(影響)
김병주,Kim Byong-Joo 대한약리학회 1965 대한약리학잡지 Vol.1 No.1
1. In the tortoise, Amyda japonica, a cold-blooded animal readily available in this country, the role of catecholamines in the regulation of free fatty acids(FFA) metabolism was investigated in both in vivo and in vitro studies. 2. Norepinephrine elevated both FFA and glucose levels in plasma. 3. When $50{\mu}g/kg$ of Epinephrine, Norepinephrine and Isopropylarterenol were administered intravenously, the relative effectiveness of mobilizing FFA was in the descending order of potency-Epinephrine, Norepinephrine and Isopropylarterenol. 4. In order to exclude the 'tonic influence of the endogenous catecholamines', reserpine was given to some animals. Two days after the reserpine-treatment, glucose showed a significant increase over the solely vehicle treated controls, FFA but an insignificant one. Excised auricles from those animals showed a diminished response to tyramine. Seven days after the treatment, however, when the depletion of catecholamines from the tissue stores seemed to be complete, judged from the absence of the response of isolated auricles to tyramine, both FFA and glucose levels were definitely lowered. 5. In in vitro experiments Epinephrine enhanced the FFA-release from the adipose tissue. The effect increased proportionately with the concentration until a maximal effect was attained at a concentration of 1x $10^5$ g/ml. 6. The order of potency in releasing FFA from adipose tissue in vitro was the same as in vitro, i.e., Epinephrine, Norepinephrine and Isopropylarterenol, but the differences were much less marked. 7. Ergotamine exerted no lipolytic action, but inhibited the lipolytic effect ef Epinephrine significantly. 8. Nethalide showed a slight lipolytic effect per se but inhibited the Epinephrine-induced lipolysis significantly. 9. Catecholamines play an important role in regulating FFA metabolism in the cold-blooded animal, just as in the warm-blooded animals, and the tortoise, Amyda japonica, may be used in the studies of fat metabolism as well as the rat.
사다리꼴 미세유로의 대류비등 2상유동:1부-압력강하 특성
김병주(Byong Joo Kim),김건일(Geonil Kim) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.1
Characteristics of two-phase pressure drop in microchannels were investigated experimentally. The microchannels consisted of 9 parallel trapezoidal channels with each channel having 205 ㎛ of bottom width, 800 ㎛ of depth, 3.6° of sidewall angle, and 7 ㎝ of length. Pressure drops in convective boiling of Refrigerant 113 were measured in the range of inlet pressure 105~195 ㎪, mass velocity 150~920 ㎏/㎡s, and heat flux 10~100 ㎾/㎡. The total pressure drop generally increased with increasing mass velocity and/or heat flux. Two-phase frictional pressure drop across the microchannels increased rapidly with exit quality and showed bigger gradient at higher mass velocity. A critical review of correlations in the literature suggested that existing correlations were not able to match the experimental results obtained for two-phase pressure drop associated with convective boiling in microchannels. A new correlation suitable for predicting two-phase friction multiplier was developed based on the separated flow model and showed good agreement with the experimental data.
김병주(Byong Joo Kim),김건일(Geonil Kim) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.11
Characteristics of flow boiling heat transfer in microchannels were investigated experimentally. The microchannels consisted of 9 parallel trapezoidal channels with each channel having 205 m of bottom width, 800 m of depth, 3.6 o of sidewall angle, and 7 cm of length. Tests were performed with R113 over a mass velocity range of 150~920 kg/m 2 s, heat flux of 10~100 kW/m 2 and inlet pressures of 105~195 kPa. Flow boiling heat transfer coefficient in microchannels was found to be dominated by heat-flux. However the effect of mass velocity was not significant. Contrary to macrochannel trends, the heat transfer coefficient was shown to decrease with increasing thermodynamic equilibrium quality. A new correlation suitable for predicting flow boiling heat transfer coefficient was developed based on the laminar single-phase heat transfer coefficient and the nucleate boiling dominant equation. Comparison with the experimental data showed good agreement.
김병주(Byong Joo Kim),김건일(Geonil Kim) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.12
An experimental study has been performed on the single phase flow and convective heat transfer in trapezoidal microchannels. The microchannel was about 270 ㎛ wide, 800 ㎛ deep. and 7 ㎜ long, which might ensure hydrodynamically fully-developed laminar flow at a low Reynolds number. The experiments were conducted with R113 and water, with the Reynolds number ranging from approximately 30 to 5000 for friction factor and 30 to 700 for the Nusselt number. Friction factors in laminar are found to be in good agreement with the predictions of existing correlation suggesting that a conventional analysis approach can be employed in predicting flow friction behavior in microchannels. However turbulent friction factors are hardly predictable by the existing con-elations. The experimental results show that the Nusselt number is not a constant but increases almost linearly with the Reynolds number even the flow is fully developed (Re<100). The dependence of the Nusslet number on the Reynolds number is contradictory to the conventional theory. At a Reynolds number greater than 100, the Nusselt number increases slowly with the Reynolds number, where thermally developing flow is responsible for the increase of the Nusselt number with the Reynolds number.
저온수를 이용하는 일중효용/이단승온 리튬브로마이드-물 흡수식 시스템의 동적 해석
김병주(Byong Joo Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.12
Dynamic behavior of Libr-water absorption system using low-temperature hot water was investigated numerically. Thermal-hydraulic model of single-effect/double-lift 100 RT chiller was developed by applying transient conservation equations of total mass, Libr mass, energy and momentum to each component. Transient variations of system properties and transport variables were analysed during start-up operation. Numerical analysis were performed to quantify the effects of bulk concentration and part-load operation on the system performance in terms of cooling capacity, coefficient of performance, and time constant of system. For an absorption chiller considered in the present study, optimum bulk concentration was found to exist, which resulted in the minimum time constant with stable cooling capacity. COP and time constant increased as the load decreased down to 40%, below which the time constant increased abruptly and COP decreased as the load decreased further.