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High-k HfO2와 HfO2/Al2O3/HfO2 적층막의 구조 안정성 및 전하 트랩핑 특성 연구
안영수 ( Young Soo Ahn ),허민영 ( Min Young Huh ),강해윤 ( Hae Yoon Kang ),손현철 ( Hyun Chul Sohn ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.3
In this work, high-k dielectric stacks of HfO2 and HfO2/Al2O3/HfO2 (HAH) were deposited on SiO2/ Si substrates by atomic layer deposition as charge trapping layers in charge trapping devices. The structural stability and the charge trapping characteristics of such stacks were investigated using Metal-Alumina- Hafnia-Oxide-Silicon (MAHOS) structure. The surface roughness of HfO2 was stable up to 11 nm with the insertion of 0.2 nm thick Al2O3. The effect of the thickness of the HAH stack and the thickness of intermediate Al2O3 on charge trapping characteristics were investigated for MAHOS structure under various gate bias pulse with duration of 100 ms. The threshold voltage shift after programming and erase showed that the memory window was increased with increasing bias on gate. However, the programming window was independent of the thickness of HAH charge trapping layers. When the thickness of Al2O3 insertion increased from 0.2 nm to 1 nm, the erase window was decreased without change in the programming window.
Marfan 증후군의 심혈관계 합병증의 수술적 치료 4례
김애란,김태희,이재호,허민영,이현성,김대경,김두일,김동수 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5
Marfan syndrome is a variable, autosomal dominant connective tissue disorder, affecting mainly the cardiovascular system, eyes, and skeleton. The incidence is approximately 1 in 9800, and around 26% of cases have no family history, the condition resulting from a new mutation. Cardiovascular complications of Marfan syndrome include mitral valve prolapse and regurgitation, Lt. ventricle dilatation and cardiac failure, and pulmonary artery dilatation, but aortic root dilatation is the most common cause of morbidity and mortality. Aortic valve incompetence usually arises in the context of a dilated aortic root, and the risk of aortic rupture increases substantially when the diameter at the sinus of Valsalva exceeds 5.5㎝. Marfan syndrome mortality from complications of aortic root dilatation has decreased and life expectancy has increased, associated with increased medical and surgical intervention. Risk factors for aortic root dissection include increased aortic diameter, extent of aortic dilatation, rate of aortic dilatation, and family history of aortic dissection.