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정한식,정효민,김경근,노승탁,Chung, Han Shik,Jeong, Hyo Min,Kim, Kyung Kun,Ro, Sung Tack 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.2
The turbulent natural convection in the membrane type LNG carrier cofferdam with heating points has been studied by numerical method. As the numerical methods, we introduced the three turbulence model, a standard $k-{\varepsilon}$ model and two case of a low Reynolds number models. The parameters considered for this study ore number and capacity of heating points i.e., $1{\leq}Ns{\leq}12$ and $1.0{\times}10^5{\leq}Qs(W/m^3){\leq}1.0{\times}10^8$. The results of the isotherms and velocity vectors have been represented for various parameters. The temperature and velocity at upper position in the space ore shown to be higher than those at lower position. For obtaining the optimal temperatures, $20{\sim}30^{\circ}C$ in the cofferdam space, the heating capacities show $2.0{\times}10^7W/m^3$ at g-heating points and $1.0{\times}10^7W/m^3$ at 12-points. The mean temperature in the cofferdam space can be expressed as a function of number and capacity of heating points.
2개의 축방향핀을 가진 전도관과 원통사이의 자연대류 열전달
정한식,이상훈,김찬원,권순석,Chung, H.S.,Lee, S.H.,Kim, C.W.,Kwon, S.S. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.3
A numerical study has been performed on the natural convection heat transfer from a conducting tube with two axial fins to a surrounding cylinder. As increasing dimensionless fin length ($L_F$), the center of flow moves to the bottom of annulus and the recirculating flow rate is decreased. The maximum local Nusselt number of conducting tube appears at ${\theta}=180^{\circ}$ for $L_F=0.0$, but at ${\theta}=130^{\circ}$ for $L_F{\geq}0.3$ and that of outer cylinder appears at ${\theta}=13^{\circ}$ for $L_F{\leq}0.6$ but at ${\theta}=33^{\circ}$ for $L_F=1.0$. The fin temperature is decreased by increasing radial distance and the temperature distribution of the downward fin is generally less than that of the upward fin. By increasing fin length, the local Nusselt number of the upward fin appears negative values for $L_F=1.0$, but appears positive values for $L_F<0.8$, and that of the downward fin appears positive values.
2개(個)의 수직(垂直) 평판(平板)핀을 가진 전도관(傳導管)으로 부터의 자연대류(自然對流) 열전달(熱傳達)
정한식,이철재,권순석,Chung, H.S.,Lee, C.J.,Kwon, S.S. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.4
Conjugate heat transfer by steady laminar natural convection from a conducting tube with two vertical axial fins has been studied by a finite difference numerical procedure under basic conditions; $Ra=10_6$, Pr = 5 and $L_F=0.15$. The maximum local tube Nusselt number appears at ${\theta}=140^{\circ}$ for $L_F=0.06$, at ${\theta}=130^{\circ}$ for $L_F=0.30$ and at ${\theta}=120^{\circ}$ for $L_F=0.30$, $L_F=0.06$, respectively. The maximum mean Nusselt number shows at $L_F=0.18$ for the downward fin and at $L_F=0.12$ for the upward fin. Therefore the optimized fin length is $L_F{\approx}0.15$ under these conditions. At $L_F=0.15$, the mean Nusselt number by increasing Rayleigh number is remarkably increased for downward fin and then is slowly increased except for downward fin, it by increasing Prandtl number is apparently increased at $Pr{\leq}2$, and slightly increased at Pr>2.
정한식,권순석 대한기계학회 1987 대한기계학회논문집 Vol.11 No.2
본 논문에서는 수평관 내부의 체적평균온도를 가진유체의 난류강제대류에서 열전달이 일어나는 경우에 대하여 핀이 없는 수평전도관, 하향 핀이 부착된 수평전도 관 그리고 상향 핀이 부착된 수평전도관의 열전달 특성을 수치계산으로 연구하고 Mach -Zehnder 간섭계를 이용하여 실험하였고 수치해석과 실험결과를 비교하여 타당성을 확 인하였다. An numerical and experimental study has been performed on natural convection heat transfer from a horizontal heat exchanger tube with a fin. At s bare tube, by increasing $C_{T}$ (tube conduction parameter), mean Nusselt number and outer wall temperature are apparently increased at $C_{T}$.leq.300, slightly increased at $C_{T}$>300 and they can be represented in an exponential function of $C_{T}$. Natural convection heat transfer characteristics for the tube with a fin at given Rayleigh number are well agreed by those for an isothermal cylinder at a modified Rayleigh number. The local fin Nusselt number of the tube with a downward fin is much higher than that of the tube with an upward fin. The comparisons between numerical and experimental results showed good agreement.reement.
UML 모델링과 COM을 기반으로 한 컴포넌트의 런타임 갱신
정한식,김일곤,김황수,Jung, Han-Shik,Kim, Il-Kon,Kim, Hwang-Soo 한국정보과학회 2000 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.11
컴포넌트의 런타임 갱신은 컴포넌트를 사용하는 프로그램을 종료하지 않고, 기존에 사용하는 컴포넌트를 그 내부가 새로 변경된 컴포넌트로 교환하는 기술이다. 최근 소프트웨어 개발에서는 기존 컴포넌트를 재활용하여 새로운 소프트웨어를 개발하는 추세이다. 그러나 컴포넌트가 시간 측면에서 연속적인 서비스를 제공해야하는 소프트웨어에 사용될 때 컴포넌트를 새롭게 기능이 바뀐 것으로 변경하려면 기존 소프트웨어를 종료해야한다. 이 경우 기존 소프트웨어의 서비스를 제공받는 사용자는 서비스를 다시 요구해야 되며 때로는 자신이 사용하는 정보를 손실하는 경우도 발생한다. 따라서, 본 논문에서는 기존 컴포넌트 갱신 방법의 문제점을 해결하기 위하여 소프트웨어를 종료하지 않고 그 소프트웨어를 구성하는 컴포넌트를 새로운 컴포넌트로 갱신하기 위한 방법을 제시한다. Runtime updating of component is a technology which is replacing component used in program with newly implemented component without terminating running program using old one. Recently, it is trend that softwares are developed by reusing the existing component. When we use these components to softwares which have to offer consecutive services, they must be terminated or shutdown to update component with newly implemented one. In this case, users who are offered services of software have to request them one more time and sometimes lose informations which they use. Therefore, this paper suggests how to update components with newly implemented one without terminating tbe running software wbicb is cmnposed witb tbe component for tbe purpose of solving problems which are occurred wben existing components are being ubdated.