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강병희,양성환,권순석,Kang, B.H.,Yang, S.H.,Kwon, S.S. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.4
The effect of the gap width on conjugate heat transfer in the cylindrical annulus for an insulated tube has been studied numerically by the finite difference method. The parameters considered here are the Rayleigh number, Ra, the dimensionless insulated wall thickness, $W/D_i$ and the dimensionless gap width, S/W. As S/W increases, the mean wall temperature increases at the inside wall of annulus and decreases at the outside walls of annulus and the insulated tube at $S/W{\leq}0.5$, and then slightly increases at $Re=10^4$, $W/D_i=1.47$. The heat transfer rate decreases at $S/W{\leq}0.5$ and then increases apparently as S/W increases at $Re=10^4$, W/Df=1.47. Therefore, it is considered that $$S/W{\sim_=}0.5$$ is the optimum gap width for the effect of insulation at $Re=10^4$, $W/D_f=1.47$.
유출구가 사각공간에서의 혼합대류 열전달에 미치는 영향 (Ⅰ)
이철재(C.J.Lee),양성환(S.H.Yang),정한식(H.S.Chung),권순석(S.S.Kwon) 한국태양에너지학회 1994 한국태양에너지학회 논문집 Vol.14 No.1
본 연구는 유출구가 사각공간에서의 혼합대류 열전달에 마치는 영향을 유한차분법을 사용하여 수치해석 하였으며, Pr=0.71. 30≤Re≤600, 700≤Cr≤100000의 범위에서 중앙 또는 오른쪽 유출구에 대하여 유선, 등온선, 속도분포, 온도분포 등을 구하여 해석한 결과, Re=100, Gr=10000에서 최소셀이 나타났고, 평균 Nusselt 수는 다음과 같은 상관식으로 나타낼 수 있었다.<br/> Nu=C Gr^(0.04)Re^(0.61). The effect of the positions of an outlet on mixed convective heat transfer in a rectangular enclosure has been investigated by numerically using the finite difference method. The parameters studied in this study are Pr=0.71, 30≤Re≤600, 700≤Gr≤100000 and the positions of an outlet. The results show streamlines, isotherms, velocity distributions, as well as correlations for Nusselt numbers. It is found that the minimum cell occurs at Re=100, Gr= 10⁴. The mean Nusselt numbers can be expressed by the correlation equation, Nu=C Gr^(0.04)Re^(0.61).
잡견에서 조영제 혈관외유출 예방을 위한 스트레인 게이지 기반의 EDA 시스템 성능 평가를 위한 실험적 연구
권대철,유병규,이종석,조문선,양성환,Kweon, D.C.,Yoo, B.G.,Lee, J.S.,Cho, M.S.,Yang, S.H. 대한의용생체공학회 2008 의공학회지 Vol.29 No.1
The major risk associated with the use of automated power injectors is the well known complication of contrast material extravasation at the injection site. Automated injection of computed tomography (CT) contrast media can produce the compartment syndrome. The purpose of this study was to assess the ability of this device during clinically important episodes of extravasation. The extravasation detection accessory (EDA) system was composed of a strain gage, an amplifier and a computer based system. A strain gage pliable adhesive patch was applied to the skin aver the intravenous catheter and the catheter was connected to the power injector with a cable to monitor the resolution data. If the programmed monitoring, which was developed with MS Visual C++, at the extravasation occurred, then the injection was interrupted the auto injector. CT was used to demonstrate the clinically important extravasation. This study was a prospective, observational study in which the EDA system was used to monitor the automated mechanical injection of contrast material in 7 dogs. There were two true-positive cases (range of extravasation volumes: $18{\sim}22ml$), twenty three true-negative cases, three false-positive cases and no false-negative cases. The EDA system had a sensitivity of 100% and a specificity of 88% for the detection of clinically important extravasation. The EDA system had good sensitivity for the detection of clinically important extravasation and the EDA system has the clinical potential for the early detection of extravasation of the contrast medium that is administered with power injectors. The EDA system is easy to use safe and accurate for the monitoring extravasation of the intravenous injections, and this system may prove especially useful in CT applications.