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RISS 인기검색어
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- 저자 : 이근배(K. B. Lee) (검색결과 11 건)
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이근배,Lee, K.B. 대한정형외과스포츠의학회 2007 대한정형외과스포츠의학회지 Vol.6 No.1
최근에 스포츠 손상이 증가하고 관절경을 이용한 치료가 발전하면서 조기에 더 적극적인 치료를 하는 추세이다. 또한 방사선 소견에 비하여 관절경하에서는 연골이 불안정하거나 분리되어 있는 경우도 있으므로 기존의 수술 적응증보다는 좀 더 광범위하게 관절경 검사 및 수술적 치료가 요구된다고 생각한다. 치료 방법을 하면 $1.5cm^2$ 이하의 병변을 가진 50세 이하의 환자는 관절경을 이용하여 변연 절제술, 연골하 천공, 연마, 미세 골절술, 소파술 등의 방법으로 치료할 수 있다. 같은 방법으로 50세 이상의 $3cm^2$ 이하의 병변을 가진 환자 중 mosaicplasty와 자가 연골 세포 이식술을 적용할 수 없는 환자에서 시도해볼 수 있다. $1.5\sim3cm^2$의 병변을 가진 50세 이하의 환자, 그전의 관절경적 치료로 실패한 경우에는 자가골 연골 이식 또는 자가 연골 세포 이식술을 이용하여 치료해야 한다. $3cm^2$ 이상의 병변을 가진 50세 이하의 환자는 자가 연골 세포 이식술이나 동종 골 연골 이식을 이용하여 치료하며, 50세 이상의 환자는 관절 고정술이나 족근 관절 인공치환술을 고려하는 것이 바람직하다.
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3차원 곤충 날갯짓 비행에서 날개-몸통-와류 상호작용이 공력발생에 미치는 영향에 대한 수치연구
이근배(K. B. Lee),김종암(C. Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
This paper investigates the unsteady aerodynamic features of wing-body-vortex interactions in three-dimensional insects flapping motions under forward flight condition. Since the flow field around the blowfly exhibits characteristics of low-Reynolds number flow, the three-dimensional unsteady incompressible Navier-Stokes equations are employed as the governing equations. In this paper, detailed numerical simulations of four types of wings are carried out under various body angles. From the results, the wing-body interactions have a non-negligible effect on the qualitative and quantitative aerodynamic characteristics.
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이근배(K.B. Lee),김진호(J.H. Kim),김종암(C. Kim) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
To implement the insects' flapping flight for developing flapping MAVs(micro air vehicles), the unsteady flow characteristics of the insects' forward flight is investigated In this paper, two-dimensional FSI(Fluid-Structure Interaction) simulations are conducted to examine realistic flow features of insects' flapping flight and to examine the flexibility effects of the insect's wing. The unsteady incompressible Navier-Stokes equations with an artificial compressibility method are implemented as the fluid module while the dynamic finite element equations using a direct integration method are employed as the solid module. In order to exchange physical information to each module, the common refinement method is employed as the data transfer method Also, a simple and efficient dynamic grid deformation technique based on Delaunay graph mapping is used to deform computational grids. Compared to the earlier researches of two-dimensional rigid wing simulations, key physical phenomena and flow patterns such as vortex pairing and vortex staying can still be observed. For example, lift is mainly generated during downstroke motion by high effective angle of attack caused by translation and lagging motion. A large amount of thrust is generated abruptly at the end of upstroke motion. However, the quantitative aspect of flow field is somewhat different. A flexible wing generates more thrust but less lift than a rigid wing. This is because the net force acting on wing surface is split into two directions due to structural flexibility. As a consequence, thrust and propulsive efficiency was enhanced considerably compared to a rigid wing. From these numerical simulations, it is seen that the wing flexibility yields a significant impact on aerodynamic characteristics.
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EDISON_CFD : e-Science 인프라 기반의 전산유체역학 교육ㆍ연구용 시뮬레이션 소프트웨어 및 콘텐츠 개발
이성욱(S. Lee),이근배(K. B. Lee),박수형(S. H. Park),최성임(S. I. Choi),김종암(C. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
EDISON_CFD, an abbreviation of EDucation-research Integration through Simulation On the Net for Computational Fluid Dynamics, is a virtual organization designed to support educationㆍresearch in the e-Science environment. Our research group focuses on developing simulation software and contents based on numerical analyses. Through national research projects, many valuable R&D results have been developed in universities and research institutes. However, educational contents used for delivering advanced researches to inspire students still lack, and various nonlinear fluid dynamic phenomena make it harder to understand the physical reality intuitively. Thus, development of software and contents for effective and advanced educationㆍresearch is essential. The present work aims to establish the open platform of software and contents for online educationㆍresearch using the results of the state-of-art techniques.
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EDISON_전산열유체를 활용한 풍력발전기 타워의 후류 불안정성 억제에 관한 수치연구
김수용(S.Y. Kim),진도현(D.H. Jin),이근배(K.B. Lee),김종암(C. Kim) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.1
The performance of the wind turbine is determined by wind speed and unsteady flow characteristics. Unsteady wake flow causes not only the decline in performance but also structural problems of the wind turbine. In this paper, conceptual designs for the wind turbine tower are conducted to minimize unsteady wake flow. Numerical simulations are performed to inspect the shape effect of the tower. Through the installation of additional structures at the rear of the tower, the creation of Karman vortex is delayed properly and vortex interactions are reduced extremely, which enhance the stability of the wind turbine. From the comparative analysis of lift and drag coefficients for each structure, it is concluded that two streamwise tips with a splitter plate have the most improved aerodynamic characteristics in stabilizing wake flow.
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李基寧,李根培,李春寧,全鉉五 서울대학교 1958 서울대학교 論文集 Vol.7 No.-
Vitamin B_12 contents of a variety of conventional Korean foods were bioassayed employing Euglena gracilis. On the basis of fresh weight animal organs and fremented sea foods are excellent sources of vitamin B_12. Several foods of plant origin were found to be fair sources of the vitamin B_12.
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