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차호진,송태호,Cha, Ho-Jin,Song, Tae-Ho 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.6
The Discrete Ordinates Interpolation Method (DOIM) is tested in three-dimensional enclosures. The radiative transfer equation (RTE) is solved for a linear source term and the DOIM is formulated for a gray medium. Several interpolation methods can be applied to the DOIM scheme. Among them, the interpolation method applicable to an unstructured grid system is discussed. In a regular hexahedron enclosure, radiative wall heat fluxes are calculated and compared with exact solutions. The enclosure has an absorbing, emitting and nonscattering medium and a constant temperature distribution. These results are obtained with varying optical depths (xD = 0.1, 1.0, 10.0). Also, the same calculations are performed in an irregular hexahedron enclosure. The DOIM is applied to an unstructured grid system as well as a structured grid system for the same regular hexahedron enclosure. They are compared with the exact solutions and the computational efficiencies are discussed. When compared with the analytic solutions, results of the DOIM are in good agreement for three-dimensional enclosures. Furthermore, the DOIM can be easily applied to the unstructured grid system, which proves the reliability and versatility of the DOIM.
제어체적 복사열정산을 위한 구분종좌표보간법의 오차 및 보정방안
차호진,송태호,Cha, Ho-Jin,Song, Tae-Ho 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.6
The discrete ordinates interpolation method (DOIM) has shown good accuracy and versatile applicability for the radiation $problems^{(1,2)}$. The DOIM is a nonconservative method in that the intensity and temperature are computed only at grid points without considering control volumes. However, when the DOIM is used together with a finite volume algorithm such as $SIMPLER^{(3)}$, intensities at the control surfaces need to be calculated. For this reason, a 'quadratic' and a 'decoration' schemes are proposed and examined. They are applied to two kinds of radiation problem in one-dimensional geometries. In one problem, the intensity and temperature are calculated while the radiative heat source is given, and in the other, the intensity and the radiative heat source are computed with a given temperature field. The quadratic and the decoration schemes show very successful results. The quadratic scheme gives especially accurate results so that further decoration may not be needed. It is recommended that the quadratic and the decoration schemes may be used together, or, one of them may be applied for control volume radiative energy balance.
Cardiac Catabolic Factor 가 심장판막에 미치는 영향에 관한 연구
김경수,김정현,김성윤,임헌길,이정균,이방헌,강종명,차호진 대한내과학회 1987 대한내과학회지 Vol.32 No.1
It is recently known that the cultures of porcine heart valves & aorta secrete a factor that stimulate the degradation of cartilage matrix in a fashion similar that displayed by synovial catabolin. The heart valve factor also induces the release of chondroitin sulfate & hydroxyproline from isolated heart valve cultures. The present observations support the hypothesis that tissues producing catabolic factors may well be responsive to them and that these messengers may play a role in the cellular regulation of the degradation of intercellular macromolecules. We have investigated that the effect of cardiac catabolic factor on autologous or heterogous tissue by Masson`s trichrome stain and obtained following results. 1) The cardiac catabolic factors were released from the porcine heart valve media, the factors induced lysis its own intercellular matrix. 2) This cardiac catabolic factors showed the catabolic effect on human heart valve. 3) The porcine aorta showed resistance to cardiac catabolic factor. 4) The cardiac catabolic factors were not released from chordae tendineae & papillary muscle media.