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3차원 비대칭 철근콘크리트 구조물의 비선형 지진응답해석
임현규,이영근,강준원,지호석,조호현,김문수,Lim, Hyun-Kyu,Lee, Young-Geun,Kang, Jun Won,Chi, Ho-Seok,Cho, Ho-Hyun,Kim, Moon-Soo 한국전산구조공학회 2014 한국전산구조공학회논문집 Vol.27 No.5
본 논문은 철근콘크리트 구조물의 지진해석에 관한 국제 벤치마크 프로젝트인 SMART-2013을 통해 3차원 비대칭 철근콘크리트 건물의 고유진동수와 재료 비선형성을 고려한 지진응답을 계산한 결과를 제시한다. 이를 위해 콘크리트와 철근의 비선형 재료모델을 구성하고 대표부피요소에 대한 국부테스트를 수행하여 비선형 모델의 성능을 평가하였다. 이러한 SMART-2013 철근콘크리트 건물의 비선형 유한요소모델에 대해 모드해석과 저강도 지진하중에 대한 선형 시간이력해석을 수행한 결과, 구조물의 고유진동수, 변위 및 가속도 시간이력이 SMART-2013 프로젝트에서 제시한 실험값들과 유사하였다. 또한 Northridge 지진에 대한 변위 및 가속도 응답의 시간이력과 최대층간상대변위의 응답스펙트럼을 계산하여 고강도 지진하중에 대한 이 철근콘크리트 건물의 거동을 평가하였다. This paper presents the seismic performance of a geometrically unsymmetrical reinforced concrete building considering torsional effect and material nonlinearity of concrete and steel. The reinforced concrete building is a structure for seismic performance evaluation in the SMART-2013 international benchmark program. Nonlinear constitutive models for concrete and steel were constructed, and their numerical performance was demonstrated by various local tests. Modal analysis showed that the first three natural frequencies and mode shapes were close to the experimental results from the SMART-2013 program. In the time history analysis for low-intensity seismic loadings, displacement and acceleration responses at sampling points were similar to the experimental results. In the end, nonlinear time history analysis was conducted for Northridge earthquake to predict the behavior of the reinforced concrete structure under high-intensity seismic loadings.
Mg-Al 합금의 크리프 거동에 미치는 합금원소의 영향
임현규 ( Hyun Kyu Lim ),김세광 ( Shae K Kim ),김도향 ( Do Hyang Kim ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.1
In this study, three magnesium alloys were investigated; those are 1.5wt.% CaO added AM80, 1.0wt.% CaO added AM60, and conventional MRI153 alloys. Test specimens of three alloys were prepared by re-melting and casting into steel mold with ingots and machining. The mechanical properties and the creep behavior at 150 degrees Celsius of these specimens were determined and their microstructures were characterized using OM and SEM. For the application to die-casting, fluidity test were carried out with spiral mold. Compared with 1.0wt.% CaO added AM60 alloy, 1.5wt.% CaO added AM80 alloy exhibited good creep properties in all test conditions. Moreover, CaO added alloys showed better creep properties than MRI153 alloy at lower load condition. It is proposed that 1.5wt.% CaO added AM80 alloy is useful to apply to power-train parts such as transmission case in vehicles.
종합 안전지수 평가체계 수립을 위한 스마트디바이스 기반 HSE 모니터링 시스템에 관한 연구
우종훈,임현규,윤경원,함동균,Woo, Jong-Hun,Lim, Hyun-Kyu,Youn, Kyung-Won,Ham, Dong-Kyun 해양환경안전학회 2015 해양환경안전학회지 Vol.21 No.4
본 연구에서는 조선소에서 작업자의 안전 확보를 위하여 스마트디바이스를 기반으로 동작, 체온, 외부온도, 맥박, 호흡, 청각적 기능을 탑재하였고, 이로부터 획득되는 정보들을 취합하여 서버 컴퓨터로 보내기 위한 클라이언트/서버 프로그램을 개발하였다. 또한, 작업자의 안전 상태를 진단할 수 있는 종합안전지수의 개념을 제시하였고 실제 선박에 탑승하여 센서모듈 및 스마트디바이스 테스트를 수행을 통해 획득된 데이터들에 대한 상관관계분석 및 다중 회귀분석을 통해 결과데이터와 센서 값 사이에 유의미한 상관관계를 가지고 있음을 확인하였다. In this paper, smartphone based measuring device was developed by integration of several sonsors such as moving, temperature, pulsation, respiration and hearing and sever/client programs was developed for the data acquisition and communication between smartphone and server computer. Then, the concept of CSI(combined safety index) was proposed for the comprehensive diagnositcs of workers status. For the validation of the proposed concept, the real data was acquired by boarding at training ship of korea maritime and ocean university. The acquired data was analyzed with the stochastical method of regressionn, then the meaningful result was driven that could explain the relation between the risky situation and the measured chronical data.
종합 안전지수평가체계 수립을 위한 스마트디바이스 기반 HSE 모니터링 시스템에 관한 연구
함동균(Dong Kyun Ham),임현규(Hyun Kyu Lim),우종훈(Jong Hun Woo) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
In general, the workspace of ship building is one of the most places accident happening. Furthermore, many companies are not willing to have HSE (Health, Safety, Environment) human resource enough to ensure safety. Therefore, this study was to utilize smart device for worker safety management to the workspace of Ship Building and Offshore Plant by considering ergonomic attribution. The purpose of this study is to secure the safety of workers by utilizing the sensors about motion, temperature, heart rate and decibel to cut down the accident rate by monitoring workplace constantly. And another purpose of this study is to establish CSI (Combined Safety Index) procedure through correlation analysis between worker’s data and accident data. Work’s data is analyzed by considering work process and workplace. Then, the relation between each factor and CSI is defined according to fore analysis.