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김동섭,신정철,고명규,최준규,장세진 한양대학교 의과대학 1998 한양의대 학술지 Vol.18 No.1
The congential fibrosis syndorme is rare congenital disorder which is characterized by blepharoptosis, varying degrees of limitation of eye movement, especially in vertical gaze, and abnormal head position. These clinical findings result from the fibrous replacement of normal contractile extraocular muscle tissue. The authors report one sporadic case of congential fibrosis syndrome. The 14 year-old-girl showed bilateral ptosis, fixed ocular misalignment in downward gaze, limited ductions and versions, and characteristic chin up position. The surgical management attempted to achieve functional readjustment of the ocular alignment and lid position and to correct cosmetically unacceptable abnormal head position. Result of histopathologic examination obtained at surgery shows replacement of the extraocular muscles, conjuctiva and Tenon's capsule by collagen and dense fibrous tissue. The surgical outcome is considered satisfactory when compared with preoperative status although the limitation of vertical eye movement remains unchanged after surgery.
격자 볼츠만 방법을 이용한 난류 경계층에서의 오염물질 확산에 대한 수치적 연구
김준형(Joon-Hyung Kim),윤준용(Joon-Yong Yoon),변성준(Sung-Joon Byun),신명섭(Myung-Seob Shin) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The purpose of this study is a numerical simulation of pollutant-laden flow in a boundary layer. The pollutant source is divided Ground-Level Source (GLS) and Elevated source (ES). Air velocity and pollutant particle concentration profile is compared with the experiments in a turbulent boundary layer flow. The code for this research uses Large-Eddy Simulation (LES) model by using Lattice Boltzmann Method (LBM). The Lattice Boltzmann subgrid model predicts more exact solution than previous Reynolds-Averaged Navier-Stokes (RANS) model.
격자볼츠만 아격자 모델을 이용한 난류 경계층 내에서의 오염물질 확산에 대한 수치적 연구
신명섭(Myung Seob Shin),변성준(Sung Jun Byun),김준형(Joon Hyung Kim),윤준용(Joon Yong Yoon) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.2
격자볼츠만 방법(LBM)을 이용하여 난류 경계층에서의 오염물질 확산에 대하여 수치계산을 수행하였다. 난류 경계층 내의 유동을 모사하기 위하여 격자볼츠만 방법에 Smagorinsky 아격자 모델을 적용한 LB-SGS 모델을 사용하였으며, 오염물질의 확산을 모사하기 위하여 Passive-scalar 방법을 적용하였다. LB-SGS 모델의 신뢰성 검증을 위하여 Fackrell & Robins(1982)과 Raupach & Legg(1983)의 실험 조건과 동일한 조건하에서 수치계산을 수행하였고, 수치계산으로 얻어진 농도 분포를 실험값과 비교하였다. 이 결과로부터 LB-SGS 모델이 난류 경계층 내에서의 오염물질의 농도분포를 예측하는데 적합한 모델임을 알 수 있었다. The dispersion of a pollutant in a turbulent boundary layer has been described in this study by using a two-dimensional lattice Boltzmann method (LBM) and the Smagorinsky sub-grid-scale (SGS) model. The scalar transport equation corresponding to the pollutant concentration is adopted; the pollutant is considered to be in a continuous phase. The pollutant source is classified as ground-level source (GLS) and elevated-point source (ES). Air velocity and particle concentration profile for the pollutant are compared with the respective results and profiles obtained in the experiments of Fackrell and Robins (1982) and Raupach and Legg (1983). The numerical results obtained in this study, i.e., the simulation and the experimental data for the mean flow velocity profiles and the pollutant concentration profiles, are in good agreement with each other.
격자 볼츠만 방법을 이용한 미소채널 내에서의 층류 유동에 대한 표면 거칠기의 영향
신명섭(Myung-Seob Shin),윤준용(Joon-Yong Yoon),변성준(Sung-Joon Byun),김각중(Kak-Joong Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Surface roughness is present in most of the microfluidic devices due to the microfabrication techniques. This paper presents lattice Boltzmann method (LBM) results for laminar flow in a microchannel with surface roughness. The surface roughness is modeled by an array of rectangular modules placed on top and bottom side of a parallel-plate channel. In this study, LBGK D2Q9 code in lattice Boltzmann Method is used to simulate flow field for low Reynolds number in a micro-channel. The effects of relative surface roughness, roughness distribution, roughness size and the results are presented in the form of the product of friction factor and Reynolds number. Finally, a significant increase in Poiseuille number is detected as the surface roughness is considered, while the effect of roughness on the microflow field depends on the surface roughness.
격자 볼츠만 방법을 이용한 미소 채널에서의 가스 유동에 대한 표면 거칠기 영향
신명섭(Myung-Seob Shin),윤준용(Joon-Yong Yoon),최대진(Dae-Jin Choi),변성준(Sung-Joon Byun) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Surface roughness is present in most of the microfluidic devices due to the microfabrication techniques. This paper presents lattice Boltzmann method (LBM) results for gas flow of low Reynolds number. surface roughness is modeled by a zigzag array of rectangular modules placed on two sides of a parallel-plate channel. In this study, passive scalar code in lattice Boltzmann Method is used to simulate temperature field for gas flow of low Reynolds number in a microchannel. The results show significant effects of temperature field and surface roughness in the term of the roughness element height. Finally, a significant increase in Poiseuille number is detected as the surface roughness is considered, while the effect of roughness on the temperature field is depends on the surface roughness height.