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이필승 한국해양환경·에너지학회 2014 한국해양환경공학회 학술대회논문집 Vol.2014 No.5
본 발표에서는 국내외 해양원자력 시스템의 개발현황 및 전망을 설명한다. 우선 해양원자력 시스템을 정의하고 가능한 상품별로 분류한다. 분류된 각각의 상품에 대해 국외 개발 역사 및 현황을 요약하여 설명한다. 특히 원자력 추진선과 부유식 해양원전에 대한 각 나라별 현황을 살펴본다. 선박용 원자로 및 해양원전에 대한 구내의 연구개발 동향을 살펴보고, 마지막으로 결론에서 전체 발표내용을 요약하고 시사점을 도출한다.
Geometry-dependent MITC method for a 2-node iso-beam element
이필승,Hyuk-Chun No,Chang-Koon Choi 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.29 No.2
In this paper, we present an idea of the geometry-dependent MITC method. The simple concept is exemplified to improve a 2-node iso-beam (isoparametric beam) finite element of varying section. We first study the behavior of a standard 2-node iso-beam finite element of prismatic section, which has been widely used with reduced integration (or the equivalent MITC method) in order to avoid shear locking. Based on analytical studies on cantilever beams of varying section, we propose the axial strain correction (ASC) scheme and the geometry-dependent tying (GDT) scheme for the 2-node iso-beam element. We numerically analyze varying section beam problems and present the improved performance by using both ASC and GDT schemes.
양필승,황충주,차정열,유윤정 대한치과의사협회 2012 대한치과의사협회지 Vol.50 No.7
The adhesion capabilities of different types of self-ligating brackets were measured with respect to Streptococcus mutans and Streptococcus sobrinus. Methods: Five types of self-ligating brackets (Clippy-C; Mini Clippy; Clarity-SL; Speed;Damon 3) were used for the experiment group and composite resin brackets (Spirit-MB), metal brackets (Victory) and polycrystalline alumina brackets (Clarity) were used for the control group. In order to assess adhesion of bacteria to the brackets,the brackets were cultured for 3, 6 and 24 hours in media containing bacteria and 20% sucrose. Results: There was no statistic difference in adhesion amount of Streptococcus mutans and Streptococcus sobrinus according to the types of brackets. A total adhesion amount according to bracket type was different. An extended incubation time increased adhesion amount. Observation under scanning electron microscope showed that Streptococcus sobrinus adhered more to Clippy-C and Victory rather than to Clarity-SL. Conclusions: Clarity-SL, a self-ligating esthetic bracket was confirmed to show lower bacterial adhesion to cariogenic bacteria, Streptococcus mutans and Streptococcus sobrinus group than other self-ligating brackets or conventional brackets, which suggests that proper use of self-ligating esthetic brackets might even be better in preventing tooth surface decalcification.