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여민구(Minku Yeo),신윤혁(Yoonhyuck Shin),임홍재(Hong Jae Yim),임시형(Si-Hyung Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A microcantilever is a well-known MEMS structure for sensing bio-chemical molecules. When bio-chemical molecules are adsorbed on the microcantilever's surface, resonance frequency shift is generated. There are two issues in this phenomena. The first one is which one between mass change and surface stress change effects is more dominant on the resonance frequency shift. The second one is what will be the performance change when the boundary condition is changed from cantilevers to double clamped beams. We have studied the effect of surface stress change and compared it with that of mass change by using FEM analysis. Furthermore, for microstructures having different boundary conditions, we have studied Q-factor, which determines the detection limit of micro/nano mechanical sensors.
Parametric Morphing 기법을 이용한 차량 개발 프로세스 개선
여민구(Minku Yeo),이철(Chul Lee),장상인(Sangin Chang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
CAE simulation work is important to reduce the cost and time. But in the early phase of vehicle development CAE simulation work is limited because of CAD based vehicle development process which takes much time to release the CAD data from design group. In this study, parametric morphing technique is adjusted to improve the vehicle development process using commercial SFE software. It can change the concept design model quickly and easily and can be performed to topology change and dimensional study. Commercial DEP Morpher software which is based on FE model is compared with SFE software to furnish information of morphing technique. Finally concept design study was performed for the new vehicle program of GMK using SFE. The research results shows that improved vehicle development process using parametric morphing contribute to significantly reduce the time and resources.
극대면적 UV-NIL 공정에서의 균일 가압 시스템 개발
최원호(Wonho Choi),신윤혁(Yoon-Hyuk Shin),여민구(Minku Yeo),임홍재(Hong Jae Yim),신동훈,장시열(Siyoul Jang),정재일(Jay Il Jeong),이기성(Kee Sung Lee),임시형(Si-Hyung Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Ultraviolet-nanoimprint lithography (UV-NIL) is promising technology for cost effectively defining micro/nano scale structure at room temperature and low pressure. In addition, this technology is fascinating because of it's possibility for high-throughput patterning without complex processes. However, to acquire good micro/nano patterns using this technology, there are some challenges such as uniformity and fidelity of patterns, etc. In this paper, we have focused on uniform contact mechanism and performed contact mechanics analysis. The dimension of the flexible sheet to get adequate uniform contact area has been obtained from contact mechanics simulation. Based on this analysis, we have made a uniform pressurizing device and confirmed its uniform pressurized zone using a pressure sensing paper.