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김두기(Kim Doo Kie),서형렬(Seo Hyeong Yeol) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2
This study presents the seismic risk assesment for an extradosed bridge with seismic isolators of lead rubber bearings(LRB). First, the seismic vulnerability of a structure and then the seismic hazard of the site are evaluated using earthquake data set and seismic hazard map in Korea, and the seismic risk of the structure is assessed. The nonlinear seismic analyses to consider plastic hinges of bridge columns are performed, and nonlinear characteristics of soil are included. The ductility demand is adopted to describe the nonlinear behavior of a column, and the moment-curvature curve of a column is assumed to be bilinear hysterestic. The fragility curves are represented as a lognormal distribution function for colum damage, movement of superstructure, and cable yielding. And seismic hazard is estimated using the available seismic hazard maps. The results show that the effectiveness of the columns is more noticeable than those of cables and girders, in seismic isolated extradosed bridges under earthquakes.
가진 주파수성분에 따른 항만구조물의 지진응답특성에 관한 연구
김두기(Kim, Doo Kie),류희룡(Ryu, Hee Ryong),서형렬(Seo, Hyeong Yeol),장성규(Chang, Seong Kyu) 한국해안해양공학회 2005 한국해안해양공학회 논문집 Vol.17 No.1
항만구조물의 유체-구조물-지반 상호작용(FSSI)을 고려한 지진응답해석을 수행하였다. 우리나라 동남해안에 위치한 방파제 구조물을 대상으로 장주기 및 단주기파로 구분된 지진을 비롯하여 최근 우리나라에서 발생한 울진지진에 대한 지진응답특성에 대하여 고찰하였다. FSSI 효과를 고려하기 위하여 유체요소는 평면변형해석에 사용하는 4절점 사변형요소를 수정한 요소를 이용하여 모델링 하였다. 그리고 FSSI해석, 진도법, 부가질량법에 의한 지진응답특성을 비교하였다. 고유치해석을 통하여 방파제의 고유주기를 찾고, 기존의 지진 및 최근 우리나라에서 발생한 지진에 대한 지진응답특성 결과로부터 방파제 구조물이 장주기성분에 대한 영향을 더 많이 받는 것을 확인하였다. The seismic response characteristics of a port structure were investigated by the earthquake analyses of the structure subjected to high-, low-frequency component, and Uljin earthquakes. In the Fluid-Structure-Soil Interaction(FSSI) analysis, the fluid is modeled by the 4-node quadrilateral element which is a modification of a structural plane element, and the port structure and foundation is modelled by the plane strain element. Since the present method directly models the fluid-structure-soil interaction system using finite element method, it can be easily applied to the dynamic analysis of a 2-D fluid-port-soil system with complex geometry. The results of the seismic coefficient. added mass, and FSSI methods are compared. The results showed that the earthquake with high frequency components more affects the seismic response of the structure than that of low frequency components.
김두일 ( Doo Il Kim ),이주원 ( Joo Won Lee ),김동기 ( Dong Kie Kim ),박승현 ( Seung Hyun Park ),김기훈 ( Ki Hun Kim ),설상훈 ( Sang Hoon Seol ),박보민 ( Bo Min Park ) 대한내과학회 2012 대한내과학회지 Vol.83 No.5
Acute myocarditis can be caused by viral, bacterial, or protozoal infection, or drug toxicity. Fulminant myocarditis progresses rapidly and frequently leads to cardiogenic shock, so patients should be supported by extracorporeal membrane oxygenation (ECMO), an intra-aortic balloon pump (IABP), mechanical ventilation, or a temporary pacemaker to maintain hemodynamic status. Most patients recover with supportive therapy. However, a few patients have persistent atrioventricular (AV) block. We report the case of a 34-year-old male with persistent complete atrioventricular block after the regression of acute myocarditis. Ultimately, a permanent pacemaker was implanted. (Korean J Med 2012;83:629-632)
김두기 ( Kim Doo Kie ),서형렬 ( Seo Hyeong Yeol ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
This study presents the seismic risk assesment for an extradosed bridge with seismic isolators of lead rubber bearings(LRB). First, the seismic vulnerability of a structure and then the seismic hazard of the site are evaluated using earthquake data set and seismic hazard map in Korea, and the seismic risk of the structure is assessed. The nonlinear seismic analyses to consider plastic hinges of bridge columns are performed, and nonlinear characteristics of soil are included. The ductility demand is adopted to describe the nonlinear behavior of a column, and the moment-curvature curve of a column is assumed to be bilinear hysterestic. The fragility curves are represented as a lognormal distribution function for colum damage, movement of superstructure, and cable yielding. And seismic hazard is estimated using the available seismic hazard maps. The results show that the effectiveness of the columns is more noticeable than those of cables and girders, in seismic isolated extradosed bridges under earthquakes.
김두기 ( Kim Doo Kie ),서형렬 ( Seo Hyeong Yeol ),이창주 ( Lee Chang-ju ),권세곤 ( Kwon Se-gon ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
This study presents a method for wind fragility curves of a six-span extradosed bridge. The load condition is followed by domestic design codes. The uncertainty of input variables on loads are considered. The fragility curve is represented as a log-normal distribution function. Two parameters in the log-normal distribution are estimated by the maximum likelihood method. The results show that the considered extradosed bridge seems to be very safe under design wind velocity, 50m/sec. In which, the damage state is defined using the strength of members.
김두기(DOO-KIE KIM),김동현(DONG-HYAWN KIM),장성규(SEONG-KYU CHANG),장상길(SANG-KIL CHANG) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.5
A Probabilistic neural network (PNN) technique for predicting the stability number for the armor blocks of breakwaters is presented. A PNN is prepared using the experimental data of van der Meer and is then compared with the empirical formula and previous artificial neural network (ANN) model. This comparison shows that a PNN can effectively predict the stability numbers in spite of data complexity, incompleteness, and incoherence, and can be an effective tool for the designers of rubble mound breakwaters to support their decision process and to improve design efficiency.
김두기 ( Kim Doo Kie ),서형렬 ( Seo Hyeong-yeol ),김상훈 ( Kim Sang-hoon ),류회룡 ( Ryu Hee-ryong ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
This study presents fragility curves for the seismic risk analysis of a middle-span extradosed bridge with LRB seismic isolators. The nonlinear seismic analysis is performed using SAP2000, and SHAKE91 is used to consider the nonlinear characteristics of soil. The ductility demand is adopted to discribe the nonlinear behavior of a column, and the moment-curvature curve of a columns is assumed to have bilinear hysterestic characteristics. The fragility curve is represented as a function of peak ground acceleration(PGA) and a lognormal distribution function. Two parameters in the lognormal distribution are estimated by the maximum likelihood method. The results show that the effectiveness of the columns is more noticeable than those of cables and girders, in seismic isolated extradosed bridges, under earthquakes.
김두기(Kim Doo Kie),서형렬(Seo Hyeong Yeol),이창주(Lee Chang-Ju),권세곤(Kwon Se-Gon) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
This study presents a method for wind fragility curves of a six-span extradosed bridge. The load condition is followed by domestic design codes. The uncertainty of input variables on loads are considered. The fragility curve is represented as a log-normal distribution function. Two parameters in the log-normal distribution are estimated by the maximum likelihood method. The results show that the considered extradosed bridge seems to be very safe under design wind velocity, 50m/sec. In which, the damage state is defined using the strength of members.