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VOF 방법에 의한 이동하는 자유표면이 존재하는 유동의 유한요소 해석
신수호,이우일,Sin, Su-Ho,Lee, U-Il 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.9
A numerical technique for simulating incompressible viscous flow with free surface is presented. The flow field is obtained by penalty finite element formulation. In this work, a modified volume of fluid (VOF) method which is compatible with 4-node element is proposed to track the moving free surface. This scheme can be applied to irregular mesh system, and can be easily extended to three dimensional geometries. Numerical analyses were done for two benchmark examples, namely the broken dam problem and the solitary wave propagation problem. The numerical results were in close agreement with the existing data. Illustrative examples were studied to show the effectiveness of the proposed numerical scheme.
자유 표면이 존재하는 유체 유동 해석을 위한 VOF방법의 기반의 새로운 수치 기법(I)-새로운 자유 표면 추적 알고리즘 및 검증-
김민수,신수호,이우일,Kim, Min-Su,Sin, Su-Ho,Lee, U-Il 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.12
Numerical simulation of fluid flow with moving free surface has been carried out. For the free surface flow, a VOF(Volume of Fluid)-based algorithm utilizing a fixed grid system has been investigated. In order to reduce numerical smearing at the free surface represented on a fixed grid system, a new free surface tracking algorithm based on the donor-acceptor scheme has been presented. Novel features of the proposed algorithm are characterized as two numerical tools; the orientation vector to represent the free surface orientation in each cell and the baby-cell to determine the fluid volume flux at each cell boundary. The proposed algorithm can be easily implemented in any irregular non-uniform grid systems that are usual in finite element method (FEM). Moreover, the proposed algorithm can be extended and applied to the 3-D free surface flow problem without additional efforts. For computation of unsteady incompressible flow, a finite element approximation based on the explicit fractional step method has been adopted. In addition, the SUPG(streamline upwind/Petrov-Galerkin) method has been implemented to deal with convection dominated flows. Combination of the proposed free surface tracking scheme and explicit fractional step formulation resulted in an efficient solution algorithm. Validity of the present solution algorithm was demonstrated from its application to the broken dam and the solitary wave propagation problems.
인간태아 섬유아세포와 생쥐배아 섬유아세포를 기저세포로 활용한 인간 배아줄기세포의 확립
조혜원,고경래,김미경,이재익,신수일,이동형,김기형,이규섭,Cho, Hye Won,Ko, Kyoung Rae,Kim, Mi Kyoung,Lee, Jae Ik,Sin, Su Il,Lee, Dong Hyung,Kim, Ki Hyung,Lee, Kyu Sup 대한생식의학회 2005 Clinical and Experimental Reproductive Medicine Vol.32 No.2
Objectives: This study was carried out to establish human embryonic stem cells derived from frozen-thawed embryos using mouse embryonic fibroblasts (mEFs), human fetal skin and muscle fibroblasts as feeder cells, and to identify the characteristic of embryonic stem cells. Methods: When primary mEFs, human fetal skin and muscle fibroblasts were prepared, passaging on 4 days from replating could have effective trypsinization and clear feeder layers. Eight of 23 frozenthawed 4~8 cell stage embryos donated from consenting couples developed to blastocysts. Inner cell mass (ICM) was isolated by immunosurgery. ICM was co-cultured on mEFs, human fetal skin or muscle fibroblasts. The ICM colonies grown on mEFs, human fetal skin or muscle fibroblasts were tested the expression of stage specific embryonic antigen-3, -4 (SSEA-3, -4), octamer binding transcription factor-4 mRNA (Oct-4) and alkaline phosphatase surface marker. Results: We obtained 1 ICM colony from 2 ICM co-cultured on mEFs as feeder cells and did not obtain any ICM colony from 6 ICM clumps co-cultured on human fetal skin or muscle fibroblasts. The colony formed on mEFs could be passaged 30 times every 5 days with sustaining undifferentiated colony appearance. When the colonies cultured on mEFs were grown on human fetal skin or muscle fibroblasts, the colonies could be passaged 15 times every 9 days with sustaining undifferentiated colony appearance. The colonies grown on mEFs and human fetal fibroblasts expressed SSEA-4 and alkaline phosphatase surface markers and positive for the expression of Oct-4 by reverse transcription-polymerase chain reaction (RT-PCR). The produced embryoid body differentiated spontaneously to neural progenitorlike cells, neuron-like cells and beating cardiomyocyte-like cells, and frozen-thawed embryonic stem cells displayed normal 46,XX karyotype. Conclusions: The human embryonic stem cells can be established by using mEFs and human fetal fibroblasts produced in laboratory as feeder cells.
간피막과 전복벽간에 직접 유착이 형성된 급성기 Fitz-Hugh-Curtis 증후군
이규섭 ( Kyu Sup Lee ),김정태 ( Jeong Tae Kim ),장호진 ( Ho Jin Jang ),신수일 ( Su Il Sin ),서동수 ( Dong Soo Suh ),박종훈 ( Jong Hoon Park ),장성규 ( Sung Kyoo Jang ),이동형 ( Dong Hyung Lee ),나용진 ( Yong Jin Na ) 대한산부인과학회 2006 Obstetrics & Gynecology Science Vol.49 No.10
Fitz-Hugh-Curtis syndrome means perihepatitis consisting of liver capsule inflammation without parenchymal damage associated with pelvic inflammatory disease (PID). The incidence of this syndrome in PID is reported to be 15-30%. It produces right upper quadrant pain from acute inflammatory reaction between liver capsule and adjacent peritoneum in acute phase, and later forms characteristic violin-string adhesions. Recently, it is suggested that marked hepatic subcapsular enhancement at arterial phase in contrast-enhanced CT has diagnostic value, but diagnostic laparoscopy is used as definitive diagnostic method in Fitz-Hugh-Curtis syndrome. We have experienced one case of Fitz-Hugh-Curtis syndrome in women with right upper quadrant pain, which was diagnosed by CT imaging and was not improved by appropriate antibiotic therapy. In diagnostic laparoscopic examination, we have found direct adhesion between liver capsule and anterior abdominal wall and experienced improvement in symptoms after adhesiolysis. So, we report this case with the brief review of the literatures.
냉동 컨테이너 적재부의 배관 형상에 따른 환기성능 실험
박일석(Park Il-Seouk),박상민(Park Sang-Min),이동조(Lee Dong-Jo),설신수(Seol Sin-Su) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The analysis of ventilation performance varying with duct shapes in reefer container of scale-model has studied experimentally. Most container ships have ventilation system of which ducts extended to<br/> the bottom for the purpose of efficient exhausting of condensing heat from hold. However, the size of ducts is so over-long that it causes manufacturing troubles. In this study, for various types of duct, flow visualization using smoke and normalized temperature analysis are presented. Finally, the cooling performance are compared respectively.