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TFT-LCDs에 적용 가능한 Cu-Ag 박막에 대한 Mo 기판 위에서의 특성조사
이현민,이재갑,Lee, H.M.,Lee, J.G. 한국재료학회 2006 한국재료학회지 Vol.16 No.4
We have investigated the effect of silver added to Cu films on the microstructure evolution, resistivity, surface morphology, stress relaxation temperature, and adhesion properties of Cu(Ag) alloy thin films deposited on Mo glue layer upon annealing. In addition, pure Cu films deposited on Mo has been annealed and compared. The results show that the silver in Cu(Ag) thin films control the grain growth through the coarsening of its precipitates upon annealing at $300^{\circ}C{\sim}600^{\circ}C$ and the grain growth of Cu reveals the activation energy of 0.22 eV, approximately one third of activation energy for diffusion of Ag dopant along the grain boundaries in Cu matrix (0.75 eV). This indicates that the grain growth can be controlled by Ag diffusion along the grain boundaries. In addition, the grain growth can be a major contributor to the decreased resistivity of Cu(Ag) alloy thin films at the temperature of $300^{\circ}C{\sim}500^{\circ}C$, and decreases the resistivity of Cu(Ag) thin films to $1.96{\mu}{\Omega}-cm$ after annealing at $600^{\circ}C$. Furthermore, the addition of Ag increases the stress relaxation temperature of Cu(Ag) thin films, and thus leading to the enhanced resistance to the void formation, which starts at $300^{\circ}C$ in the pure Cu thin films. Moreover, Cu(Ag) thin films shows the increased adhesion properties, possibly resulting from the Ag segregating to the interface. Consequently, the Cu(Ag) thin films can be used as a metallization of advanced TFT-LCDs.
아스팔트 및 강화노반의 두께 변화에 따른 아스팔트 직결궤도의 내구수명 평가 기초연구
이현민(H.M. Lee),이성혁(S.H. Lee),이진욱(J.W. Lee),조용성(Y.S. Cho) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
아스팔트 직결궤도는 평탄성 확보가 쉽고 별도의 충전층이 없이 신속한 시공이 가능하다. 또한 선로유실과 지반침하 등의 문제 발생 시 신속히 유지보수 할 수 있는 장점이 있다. 독일의 경우 베를린-하노버 구간의 아스팔트 직결궤도(ATD궤도)는 부설 이후 20년간 유지보수가 불필요하고 우수한 소음저감효과가 있는 것으로 보고하고 있다. 아스팔트 직결궤도는 열차하중이 침목 또는 패널로부터 아스팔트 노반에 직접 전달되는 구조로서 아스팔트 콘크리트 층의 두께 변화에 따라 상부노반에 작용하는 응력 및 아스팔트 노반 하부 변형률이 내구수명에 큰 영향을 미칠 것으로 예상된다. 따라서 본 논문에서는 현재 개발되어 있는 아스팔트 직결궤도용 광폭 침목을 이용하여 아스팔트노반 및 강화노반의 두께 변화가 강화노반에 미치는 영향을 분석하고 목표 설계수명을 평가하고자 하였다. Directly fastened asphalt track is easy to secure flatness and possible to construct quickly without any special filler layer. It also has an advantage of maintaining and repairing immediately in case of track loss or settlement. Directly fastened asphalt track (ATD track) between Berlin and Hanover in Germany is reported that its maintenance has been unnecessary for 20 years after construction. The track is also noted for its excellence of noise reduction. Directly fastened asphalt track transfers train load directly to asphalt roadbed through sleepers or panels. According to the thickness of asphalt concrete layer, therefore, the stress acting on upper roadbed and the strain of lower asphalt roadbed are expected to have a big effect on its design life. In this respect, this paper focused on the effect of the asphalt and reinforced roadbed layer thickness on reinforced roadbed and the evaluation of its service life using currently available wider sleepers for directly fastened asphalt track.
이현민(H. M. Lee),구자경(J. K. Ku),노학곤(H. G. Noh),송우진(W. J. Song),구태완(T. W. Ku),강범수(B. S. Kang),김정(J. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Electromagnetic forming(EMF) is a high-velocity forming process which uses electromagnetic Lorentz force. Advantage of this forming technique are improved formability, reduction in wrinkling, non-contact forming and applications of various forming process. But the application of electromagnetic forming technique is still limited in industry. Thus for continuous research and development of technique based on experiments, develop the forming equipment and carry out the forming experiments for validation of forming equipment.