Colposcopy of Vagina

전종수 대한부인종양 콜포스코피학회 1990 Journal of Gynecologic Oncology Vol.1 No.1

비내진 상세를 갖는 철근콘크리트 교량의 응답에 대한 수직방향 지진파의 영향

전종수 한국복합신소재구조학회 2016 복합신소재구조학회논문집 Vol.7 No.4

This research describes the impact of vertical earthquake components on the performance of typical non-ductile bridges. To achieve this goal, this research chooses a non-seismically designed reinforced concrete bridge typically found in the California area. Particularly, their columns with inadequate design have a higher possibility of shear failure. To consider this failure, the column model reflects shear-axial interaction effect and is verified by comparing simulated results and experimental data available in literature. Two computational bridge models having column shear model subjected to constant and varying axial load are then built to conduct inelastic dynamic analyses. The responses are employed to construct probabilistic seismic demand models for two bridge models. This results indicate that the consideration of shear-axial interaction effect increases the seismic demand of all bridge components in non-ductile bridges, resulting in their increased seismic vulnerability.

원발성 월경곤란증의 원인과 치료 : Etiology & Treatment

전종수 중앙대부설한국의과학연구소 1971 한국의과학 Vol.3 No.5

CFRP 교각 재킷 보수를 적용한 손상된 철근콘크리트 교량 교각의 여진 취약도 분석

전종수,이도형 한국지진공학회 2018 한국지진공학회논문집 Vol.22 No.5

This paper presents a framework for developing aftershock fragility curves for reinforced concrete bridges initially damaged by mainshocks. The presented aftershock fragility is a damage-dependent fragility function, which is conditioned on an initial damage state resulting from mainshocks. The presented framework can capture the cumulative damage of as-built bridges due to mainshock-aftershock sequences as well as the reduced vulnerability of bridges repaired with CFRP pier jackets. To achieve this goal, the numerical model of column jackets is firstly presented and then validated using existing experimental data available in literature. A four-span concrete boxgirder bridge is selected as a case study to examine the application of the presented framework. The aftershock fragility curves are derived using response data from back-to-back nonlinear dynamic analyses under mainshock-aftershock sequences. The aftershock fragility curves for as-built bridge columns are firstly compared with different levels of initial damage state, and then the post-repair effect of FRP pier jacket is examined through the comparison of aftershock fragility curves for as-built and repaired piers.

AHP 분석기법을 활용한 수 처리 서설물의 성능 평가 지표 선정에 관한 연구

전종수,박진상,오상근,임남기 대한건축학회지회연합회 2016 대한건축학회연합논문집 Vol.18 No.5

본 연구는 국내 수 처리 시설물에 적용되고 있는 방수ㆍ방식재를 대상으로 재료별 특성에 따른 분류체계를 정립하여 제시하는 것과, 수 처리 시설물에서의 시공 및 사용 환경조건과 다양한 하자사례 분석을 통해 각 분류별 방수ㆍ방식재의 실질적으로 요구되는 성능 보유 유무의 평가가 가능할 수 있는 성능 평가 지표를 선정하는 것을 목적으로 하였다. 이를 위해 각 방수・방식재들의 특성 및 유사성을 파악하여 계열별로 분류를 실시하였으며, 각 재료별 하자 사례를 분석하였다. 하자 사례 분석을 토대로 방수・방식재의 수 처리 시설물 환경에서 요구 성능 확보 여부의 평가가 가능한 총 12개의 성능 평가 지표 안(案)을 우선적으로 도출하였다. 도출된 12개의 성능 평가 지표 안(案)에 대하여 AHP분석기법을 적용하여 항목별 중요도를 부여한 후 가장 높은 중요도의 60%이하로 현저히 낮은 중요를 가진 항목 5개를 제외하였으며, 최종적으로 7개의 성능 평가 지표(습윤면부착성, 내피로성, 내균열성, 부착성능, 접합성능, 내충격성, 내투수성)를 제시하였다. This study proposes a selection method of a performance evaluation index of waterproofing and anti corrosion materials used in domestic water treatment facilities for material and construction failures based on different usage and environmental conditions to study the possibility of structural performance maintenance. Different types of waterproofing・anti-corrosion materials have been evaluated based on their respective properties, and have been classified into separate categories based on their case studies of material failures in construction. As a result, 12 different performance evaluation indexes have been produced for the performance evaluation method. Among the 12 performance evaluation index 5 were selected with relatively low importance that produced a low value of 60% importance using AHP analysis method, and conclusively proposed 7 performance evaluation index criteria (wet surface adhesion, fatigue resistance, crack resistance, adhesion performance, joint performance, impact resistance, impermeability)

국내 발생지진에 의한 물류창고 강재 적재설비의 내진성능 평가

전종수,최형석,서영득,김충길,허광희 한국지진공학회 2018 한국지진공학회논문집 Vol.22 No.3

This study experimentally and analytically examines the seismic vulnerability of steel rack storage frames subjected to Korea earthquakes (2016 Gyeongju earthquake and 2017 Pohang earthquake). To achieve this aim, this study selects a three-story, one-bay steel rack frame with a typical configuration of rack frame in Korea. Firstly, the local behavior for frame components is examined by performing monotonic and/or cyclic load tests and the global response and dynamic characteristics of the subject rack frame are investigated by conducting a shaking table test. The analytical model of the rack frame is then created based on the experimental results and is used to perform nonlinear time history analyses with recorded Korea earthquakes. The seismic demand of the rack frame is considerably affected by the spectral acceleration response, instead of peak ground accelerations (peak floor accelerations). Moreover, the collapse fragility curve of the rack frame is developed using incremental dynamic analyses for the Gyeongju and Pohang earthquakes. Fragility results indicate that the ground motion characteristics of these earthquakes do not significantly affect the frame vulnerability at the collapse state.

A flammability limit model for hydrogen-air-diluent mixtures based on heat transfer characteristics in flame propagation

전종수,최원준,김성중 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.7

Predicting lower flammability limits (LFL) of hydrogen has become an ever-important task for safety of nuclear industry. While numerous experimental studies have been conducted, LFL results applicable for the harsh environment are still lack of information. Our aim is to develop a calculated non-adiabatic flame temperature (CNAFT) model to better predict LFL of hydrogen mixtures in nuclear power plant. The developed model is unique for incorporating radiative heat loss during flame propagation using the CNAFT coefficient derived through previous studies of flame propagation. Our new model is more consistent with the experimental results for various mixtures compared to the previous model, which relied on calculated adiabatic flame temperature (CAFT) to predict the LFL without any consideration of heat loss. Limitation of the previous model could be explained clearly based on the CNAFT coefficient magnitude. The prediction accuracy for hydrogen mixtures at elevated initial temperatures and high helium content was improved substantially. The model reliability was confirmed for H2-air mixtures up to 300 °C and H2-air-He mixtures up to 50 vol % helium concentration. Therefore, the CNAFT model developed based on radiation heat loss is expected as the practical method for predicting LFL in hydrogen risk analysis.

Fragility characteristics of skewed concrete bridges accounting for ground motion directionality

전종수,최은수,노명현 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.5

To achieve this goal, two four-span concrete box-girder bridges with typical configurations of California highway bridges are selected as representative bridges: an integral abutment bridge and a seat-type abutment bridge. A detailed numerical model of the representative bridges is created in OpenSees to perform dynamic analyses. To examine the effect of earthquake incidence angle on the fragility of skewed bridges, the representative bridge models are modified with different skew angles. Dynamic analyses for all bridge models are performed for all earthquake incidence angles examined. Simulated results are used to develop demand models and component and system fragility curves for the skewed bridges. The fragility characteristics are compared with regard to earthquake incidence angle. The results suggest that the earthquake incidence angle more significantly affects the seismic demand and fragilities of the integral abutment bridge than the skewed abutment bridge. Finally, a recommendation to account for the randomness due to the ground motion directionality in the fragility assessment is made in the absence of the predetermined earthquake incidence angle.

Component fragility assessment of a long, curved multi-frame bridge: Uniform excitation versus spatially correlated ground motions

전종수,Abdollah Shafieezadeh,Reginald DesRoches 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.5

This paper presents the results of an assessment of the seismic fragility of a long, curved multi-frame bridge under multi-support earthquake excitations. To achieve this aim, the numerical model of columns retrofitted with elliptical steel jackets was developed and validated using existing experimental results. A detailed nonlinear numerical model of the bridge that can capture the inelastic response of various components was then created. Using nonlinear time-history analyses for a set of stochastically generated spatially variable ground motions, component demands were derived and then convolved with new capacity-based limit state models to obtain seismic fragility curves. The comparison of failure probabilities obtained from uniform and multi-support excitation analyses revealed that the consideration of spatial variability significantly reduced the median value of fragility curves for most components except for the abutments. This observation indicates that the assumption of uniform motions may considerably underestimate seismic demands. Moreover, the spatial correlation of ground motions resulted in reduced dispersion of demand models that consequently decreased the dispersion of fragility curves for all components. Therefore, the spatial variability of ground motions needs to be considered for reliable assessment of the seismic performance of long multi-frame bridge structures.

연속지진하중을 받는 교량 교각의 FRP 재킷 보수에 따른 확률론적 성능 평가

전종수,박태영,유완상,이상열 한국복합신소재구조학회 2019 복합신소재구조학회 학술발표회 Vol.2019 No.04