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고성능 강재(HSB 800)를 적용한 플레이트 거더의 휨강도에 대한 플랜지 국부좌굴
김정훈,김경열,이정화,김경식,강영종,Kim, Jeong Hun,Kim, Kyoung Yul,Lee, Jeong Hwa,Kim, Kyung Sik,Kang, Young Jong 한국강구조학회 2014 韓國鋼構造學會 論文集 Vol.26 No.2
최근에 인장강도 800MPa급 고성능 강재가 개발되었지만 플랜지와 복부판의 상호작용을 고려한 플레이트 거더의 국부좌굴에 대한 연구는 아직까지 미흡한 실정이다. 본 연구는 HSB 800을 적용한 플레이트 거더의 플랜지 국부좌굴에 대한 강도를 비선형 유한요소해석으로 평가하였다. 비선형 해석 시 I-단면을 갖는 플레이트 거더의 플랜지와 복부판은 3차원 쉘요소로써 초기결함 및 잔류응력을 고려하였으며, 고성능 강재의 재료모델은 다중선형 재료로 모형화하였다. 이를 적용하여 복부판이 조밀, 비조밀 그리고 세장 단면을 갖는 압축 플랜지에 대해 매개변수 해석을 수행하였다. 플레이트 거더의 플랜지 국부좌굴에 대한 거동을 분석하였고, 본 연구의 비선형 해석 결과를 AASHTO LRFD(2012)와 도로교설계기준(한계상태설계법, 2012)의 압축플랜지 공칭휨강도와 비교하여 평가하였다. High performance steel for bridges(HSB 800) with a minimum tensile stress of 800MPa was recently developed. However, the study for local buckling behavior of plate girders considering interactive effects of flanges and webs is still insufficient. In this study, the flange local buckling(FLB) strength of plate girders with HSB 800 was evaluated by nonlinear finite element analysis. The flanges and webs of plate girders having I-section were modeled as 3D shell elements in the nonlinear analysis. Initial imperfection and residual stress were imposed on the plate girder. The high performance steel was modeled as a multi-linear material. Thus, parametric study of compression flanges with a compact, noncompact and slender web was performed. The flange local buckling behavior of plate girders was analyzed, and the nonlinear analysis results were compared with the nominal flexural strength of both AASHTO LRFD(2012) and KHBDC LSD(2012) codes.
SE기반의 전순기 항공기 중량.평형관리 Program 개발
김정훈,박차환,정영화,김문규,강민성,Kim, Jeong Hun,Park, Cha Hwan,Jeong, Yeong Hwa,Kim, Mun Giu,Kang, Min Sung 한국시스템엔지니어링학회 2007 시스템엔지니어링학술지 Vol.3 No.2
There has been no systematic accumulation in the aircraft weight data even though those are crucial in the full life-cycle weight and balance program of aircraft. Companies, government agencies, and the Korea Air Force have been controling the data separately. The lack of communication between these institutes prevented the mutual use of the data. This study deals with a SE model-based weight and balance program development process for the full life-cycle weight and balance control of aircraft which enabled the efficient and mutual use of the weight data from the various institutes.
한국인 망막모세포종의 발생률(1991~1993)과 생존율(1991-2003) 보고
김정훈,유영석,Jeong Hun Kim,Young Suk Yu 대한안과학회 2010 대한안과학회지 Vol.51 No.4
Purpose: To determine the incidence (1991~1993) and survival rates (1991~2003) of retinoblastoma in Korea. Methods: Data of all Korean patients diagnosed with retinoblastoma from 1991-1993 were retrospectively collected by the hospital- based national registry based on notifications from physicians who are able to diagnose retinoblastoma. The incidence rate (1991~1993) was calculated per 100,000 childbirths (dividing the number of retinoblastoma patients by the total number of childbirths). The survival rate (1991~2003) was calculated using the Kaplan–Meier method, and the differences were evaluated with the logrank and Wilcoxon tests and Cox’s proportional hazards model.In addition, the clinical findings and prognostic factors associated with survival rate were analyzed. Results: There were a total of 108 distinct patients diagnosed with retinoblastoma in the registry. The incidence of retinoblastoma in Koreawas 4.99 per 100,000 childbirths, and the survival rate for 13 years (1991-2003) was 77.8%. The survival rate was significantly lower in the population of bilateral retinoblastomapatients, as compared to unilateral retinoblastoma patients. Optic nerve invasion was found to be an independent variable for the reduction of survival rate, although its effects were not significant. Conclusions: In the present study, the incidence and survival rates of retinoblastoma in Koreawere presented for the first time. The incidence rate was similar to rates reported from other countries. On the other hand, the survival rate was lower than those in European and the United States. In particularly, the survival rate was significantly lower in patients with bilateral retinoblastoma. J Korean Ophthalmol Soc 2010;51(4):542-551
특집:자연모사 그린테크놀로지 - 자연모사 바이오 접착 패치 개발
김정훈,서갑양,Kim, Jeong-Hun,Seo, Gap-Yang 재료연구소 2011 機械와 材料 Vol.23 No.4
본고는 자연모사공학에서 출발하여, 자연계에 존재하는 건식 접착 성질을 이용하기 위한 방법으로서 게코도마뱀의 발바닥 섬모 구조를 모사하기 위한 방안들을 설명하고 그 응용분야를 전망한다. 도마뱀의 섬모 구조가 가지는 네 가지 특징들은 고분자 폴리머 재료와 나노 신장 기술, 2단계 UV 자외선 성형 기술, 전자빔 조사 등과 같은 기술을 통해 구조 및 기능의 모사가 가능하고 실제로 제작된 구조는 좋은 접착 특성을 나타냄을 알 수 있었다. 이를 토대로 다양한 섬모 구조에서의 접착 성능을 분석하고 실제 생활에서 바이오 패치로의 응용 가능성을 제시하였다.