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이광수(K.S. Kim),이승재(S.J. Lee),서정천(J.C. Suh) 한국전산유체공학회 2003 한국전산유체공학회 학술대회논문집 Vol.2003 No.-
A vorticity-velocity integra-differential formulation of incompressible Navier-Stokes equations is described, focusing on a scheme for calculating pressure fields in application of the Lagrangian vortex method in connection with panel methods. It deals with the dynamic coupling among velocity, vorticity and pressure, and the Helmholtz decomposition of the velocity field. through a comparative study with the Eulerian finite volume method, we provide an extensive understanding of the Lagrangian vortex methods for numerical simulations of viscous flows around arbitrary bodies.
이광수(J.S.Lee),최국광(K.K.Choi) 한국태양에너지학회 1998 한국태양에너지학회 논문집 Vol.18 No.3
축류비가 5이고 형상비가 7인 長方形 노즐을 사용하여 연직 상향의 3차원 자유 충돌 수분류계를 구성하였다. 수평 충돌판에 상향의 장방형 충돌수분류가 충돌할 때, 보조수를 동반하지 않은 단일수분류 및 보조수를 동반하는 수분류에 대하여 노즐-충돌판 사이의 거리, 노즐출구 속도를 변수로하여 노즐의 긴변 방향과 짧은 변 방향에 대하여 전압 및 정압 분포를 측정하였다. 이때 충돌판상에서 정압이 영이 되는 국소 위치까지의 거리인 충돌 반폭을 구하고, 최고 압력을 나타내는 정체점을 기준으로 무차원 정압 분포식을 제시하였다. 또한 각 실험조건에서 정체점상에서의 충돌속도를 구하였으며, 충돌속도는 노즐-전열면간 거리가 증가함에 따라 감소하며 그 감쇄율은 삼차원 자유 분류의 특성감쇄 영역의 유동 특성을 갖는다. The purpose of this research is to investigate the characteristics of static and total pressure distribution' in the upward free water jet system impinged on a downward flat plate. The rectangular nozzle was used and its contraction and aspect ratio was five and about seven respectively. Experimental conditions considered were jet velocity, distance between nozzle and flat plate, height of supplementary water.<br/> It was founded that pressure distribution on the flat plate had the Gaussian curve when the pressure at stagnation point and impinging half width were chosen as the scaling parameters. The maximum pressure was shown at the stagnation point. The central impingement velocity decreased with the increment of distance between nozzle and flat plate, and its slop of decay was similar to that of chracteristics decay region in the three-dimensional free jet.
김세형(Sae Hyung Kim) 한국데이터정보과학회 2019 한국데이터정보과학회지 Vol.30 No.1
이 연구의 목적은 고등학교 3학년 성별에 따라 체육수업 중 운동시간이 우울수준에 미치는 영향에서 자아존중감에 의한 자아탄력성의 조절된 매개효과를 검증하는 것이다. 연구대상은 한국청소년정책연구원에서 조사하고 공개한 ‘중학교 1학년 패널 6차년도’ 고등학교 3학년 2011명 (남학생 1014명, 여학생 997명) 이다. SPSS PROCESS macro 3.0 프로그램을 사용하였고 유의수준은 5%로 설정하였다. 남학생의 경우는 체육수업 시간에 활발한 운동으로 증진되는 자아탄력성 효과가 우울수준의 감소로 연결되기 위해서는 긍정적인 자아존중감이 필요한 것으로 나타났다. 여학생의 경우는 체육수업 운동시간이 증가함에 따라 자아탄력성은 향상되고 우울수준은 감소하지만, 자아탄력성이 자아존중감과 조합하여 주는 효과는 없는 것으로 나타났다. 또한 남학생과 여학생의 자아존중감이 우울수준에 미치는 직접적인 영향은 여학생이 남학생에 비해 자아존중감이 높을수록 우울감소 효과가 더 크게 나타났다. 이 연구로 남녀학생들에게 공통적인 정보는 유연한 자아탄력성을 가지고 체육수업 운동시간에 활발하게 참여할수록 우울수준이 낮아진다고 할 수 있다. The purpose of this study was to examine the moderated mediating effect of ego-resilience by self-esteem in the influence of exercise hours during physical education class on depression level. The subjects were 3rd year high school students 2011 (1014 male and 997 female students), which were investigated and released by the Korean national youth policy institute. The SPSS PROCESS macro 3.0 program in SPSS 24.0 program was used. The alpha level was set at 5%. In the case of boys, active exercise hours during physical education reduced depression level and interaction effect with positive self-esteem and high ego-resilience was significantly needed. In the case of female students, active exercise hours during physical education reduced depression level but interaction effect with self-esteem and ego-resilience was not significant. In addition, the direct effect of self-esteem on the level of depression was greater for girls than for boys. This study suggested that flexible ego-resilience and active participation in physical education classes made low depression level to both male and female students.
심성택 ( Shim S. T ),송민성 ( Song M. S ),이광수 ( Lee K. S ),신성우 ( Shin S. W ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
External Confinement of concrete in CFS(Carbon Fiber sheets) enhances strength and ductility of concrete columns. This paper presents the test results on the study of reinforced concrete columns strengthened with carbon fiber sheets. The purpose of this research is to evaluate the CFS confinement characteristics of square reinforced concrete columns and the ductility behavior of R/C columns strengthened with CFS. The tests were performed with different lateral reinforcement ratios, CFS reinforcement ratios and concrete strength. Test results were characterized according to maximum loads and lateral strain of CFS and Lateral reinforcement.
송민성 ( Song¸ M. S ),심성택 ( Shim¸ S. T ),이광수 ( Lee¸ K. S ),신성우 ( Shin¸ S. W ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
Most period code formulas for the RC moment resisting frame building are empirical formulas. Code formula is developed by the measured period of the low-medium buildings during the 1971 San Fernando Earthquake. But measured periods are insufficient to assure the reliability of its accuracy and safety. This paper improves the code formula by regression analysis of the measured period data. Seismic coefficient using the improved formula is evaluated and also compared with those of being based on the current code formula.