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상실된 영구 중절치의 교정적 치료와 심미적 수복 치험례
김용기,전상언 大韓小兒齒科學會 1994 大韓小兒齒科學會誌 Vol.21 No.2
A major cause of missing permanent incisors is congenital abscence and extraction because of trauma and pathologic condition. The request for restoration of missing or spaced anterior teeth is common in dental practice. Problems, such as the tilting, drifting, and rotation of teeth adjacent to the space, complicate the restoration of apperance, and a normally simple restorative dental procedure may become difficult. There are two primary treatment alternatives to improving a dentition's irregular and spaced apperance-closing the space by orthodontic means or providing a prosthesis to disguise the space. The treatment choice depends on many variables, but, as a general rule, patients with a normal overbite, overjet, and buccal relationship are better treated by maintaining the space and providing a prosthesis, either fixed or removable. This case report presents two cases : Traumatic loss of maxillary right and left central incisors, Extraction of malformed mandibular right central inciosr. The loss of central incisor space was regained by the fixed-removable and fixed orthodontic appliance, and then Mary-land bridge was cemented.
가시광선과 아르곤 레이저에 의한 복합레진 중합 효과의 비교 연구
전상언,김용기 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.2
The purpose of this study was to evaluate the shear bond strengths,microhardness,compressive strength and contraction gap at the resin-tooth interface of two types of composite resins polymerized with visible light and argon laser sourse. The results from the present study can be summarized as follows: 1.Resin sample polymerized either by argon laser or visible light did not show significant difference in their physical properities tested(p>.05). 2.The contraction gap at the resin tooth interface was found to be present in all samples but any significant difference between groups could not be established due to their variability.Although the superiority of argon laser over visible light in enhancing the physical properities of resin could not be elucidated in the present study,continous efforts are deemed to be worthwhile to investigate this using different conditions and materials of experiment.
충격파 경계층 상호작용에서 난류모델 및 난류점성의 효과
전상언(Sang Eon Jeon),박수형(Soo Hyung Park),변영환(Yung Hwan Byun) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.2
Two compression ramp problems and an impinging shock problem are computed to investigate influence of turbulence models and eddy viscosity on the shock-wave / boundary layer interaction. A Navier-Stokes boundary layer generation code was applied to the generation of inflow boundary conditions. Computational results are validated well with the experimental data and effects of turbulence models are investigated. It is shown that the behavior of turbulence (eddy) viscosity directly affects both the extent of the separation and shock-wave positions over the separation.
천이 전달 방정식을 이용한 진동하는 익형의 동적 실속의 해석
전상언(S.E. Jeon),사정환(J.H. Sa),박수형(S.H. Park),변영환(Y.H. Byun) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.1
Numerical investigation on the dynamic stall over an oscillating airfoil is presented. A Reynolds-Averaged Navier-Stokes (RANS) equations are coupled with transition transport equations for the natural transition. Computational results considering the turbulent transition are compared with the fully turbulent computations and the experimental data. Results with transition prediction show closer correlation with the experimental data than those with the fully turbulent assumption, especially in the reattachment region.
전상언(Sang Eon Jeon),박수형(Soo Hyung Park),김상호(Sangho Kim),변영환(Yung Hwan Byun),정경진(Kyung Jin Jung),강인모(Inmo Kang) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.3
Laminar separation bubble and transitional flow over the NACA0012 are investigated at a moderate range of Reynolds numbers. A Reynolds-Averaged Navier-Stokes code is coupled with an empirical transition model that can predict transition onset points and the length of transition region. Without solving the boundary layer equations, approximated e-N method is directly applied to the RANS code and iteratively solved together. The computational results are compared with the experimental data for the NACA0012 airfoil. Results of transition onset point and the length are compared well with experimental data and Xfoil prediction. The present RANS results show at high angles of attack better agreement with experimental data than Xfoil results using the boundary layer equations.
단일 및 다단의 가스 터빈 블레이드의 2차원 단면 유동 해석
전상언(S.E. Jeon),문찬웅(C.W. Moon),박수형(S.H. Park),사정환(J.H. Sa),신정훈(J.H. Shin) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.3
Numerical investigation on two-dimensional blades of axial gas turbine is presented. The mixing plane method is applied for the boundary condition for multi-stage analysis. This method can be applied if flow field is steady and flow variations are neglected in the pitch-wise direction. The computation results are validated with the experimental data and effects of turbulence models are investigated. The VKI results using a transition model show closer correlation with the experimental data than those with fully turbulent assumption. The transition model using transport equations is widely used at moderate Reynolds numbers. The accuracy and usefulness of flow analysis on two-dimensional unsteady turbine are assessed through the multi-stage validation with the mixing plane method.
전상언(Sang Eon Jeon),박수형(Soo Hyung Park),김창주(Chang Joo Kim),정기훈(Ki Hoon Chung),정경진(Kyung Jin Jung) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
A Reynolds-Averaged Navier-Stokes (RANS) code with transition prediction model is developed and the computational results on an oscillating airfoil are compared with the experimental data for OA209 airfoil. An approximated eN method that can predict transition onset points and the length of transition region is directly applied to the RANS code. The hysteresis loop in dynamic stall is compared for the computational results using transition prediction and fully turbulent models with the experimental data. Results with transition prediction show more correlation with the experimental data than the fully turbulent computation.