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      • 이차원 유한요소해석을 이용한 지진 시 지형효과의 영향 평가

        방기호,선창국,장용구,채덕호,이희연,조완제 한국방재학회 2012 한국방재학회 학술발표대회논문집 Vol.11 No.-

        지질지반 조건의 공간적 분포와 관련된 부지효과는 지진 시 지반운동의 증폭에 지대한 영향을 미친다. 즉, 지표부근 지질지반의 층상구조와 물성뿐만 아니라 지표면 지형 및 분지 형상이 부지효과의 영향 요인이다. 이러한 부지효과 관련 영향 요소들 중에서 단지 지표부근 지질지반 조건에 따른 증폭 정도만이 미국 서부지역 기준을 근간으로 하는 국내 현행 내진설계 지침에 반영되어 있다. 그럼에도 불구하고, 최근까지의 전 세계 지진 발생 사례들로부터 지표지형 변화에 따른 광범위하고 심각한 피해들을 확인해 볼 수 있다. 따라서 본 연구에서는 다각적 해석이 가능한 범용 유한요소해석 프로그램인 ABAQUS를 이용하여 인공 절성토 지반을 모사하여 일차원과 이차원 해석을 수행하였다. 일차원 해석 결과는 지형효과의 영향이 반영되지 않았으므로 일차원과 이차원 수치 모델 해석 결과의 지표면 최대가속도 분포의 비교를 통해 각각의 변수가 지형효과에 미치는 영향을 평가하였고 궁극적으로 국내 내진설계기준에 지형효과에 대한 고려 방안을 제시하고자 하였다.

      • KCI등재

        지표지형효과에 따른 지진지반운동 증폭에 대한 실용적 고찰

        선창국,방기호,조완제,Sun. Chang-Guk,Bang. Kiho,Cho. Wanjei 한국방재학회 2012 한국방재학회논문집 Vol.12 No.3

        지질지반 조건의 공간적 분포와 관련된 부지효과는 지진 시 지반운동의 증폭에 지대한 영향을 미친다. 즉, 지표부근 지질지반의 층상구조와 물성뿐만 아니라 지표면 지형 및 분지 형상이 부지효과의 영향 요인이다. 이러한 부지효과 관련 영향 요소들 중에서 단지 지표부근 지질지반 조건에 따른 증폭 정도만이 미국 서부지역 기준을 근간으로 하는 국내 현행 내진설계 지침에 반영되어 있다. 그럼에도 불구하고, 최근까지의 전 세계 지진 발생 사례들로부터 지표지형 변화에 따른 광범위하고 심각한 피해들을 확인해 볼 수 있다. 이러한 사례들의 구체적인 현상들을 이 연구에서 고찰 제시하였다. 또한, 지형효과의 정량화 기법을 파악하기 위하여 주요 내진설계 기준들을 검토하였다. 이러한 고찰 검토 내용들을 토대로, 국내 내진설계를 위한 지형효과 결정기법에 대해 예비적 토의를 진행하고 일차원과 이차원 수치 모델 해석 결과 비교를 통해 각각의 변수가 지형효과에 미치는 영향을 파악하는 것을 기존 기준들의 도입 개선과 함께 그 방안으로 제시하였다. Site effects associated with the spatial distribution of geologic and soil conditions have a significant influence on the amplification of ground motions during an earthquake. Exactly, the stratification structure and physical properties of near-surface soils and geology, as well as the surface topography and basin geometry, affect the site effects. Among these several influence factors on the site effects, only the amplification capabilities depending on the near-surface geologic conditions have been incorporated into current Korean seismic design guidelines, which is based on the codes in the western United States. Nonetheless, extensive severe damages caused by the irregularities in surface topography have been observed from the past and recent earthquake events over the world, and their detailed phenomena were investigated in this study. Several important seismic design codes were also reviewed to examine the methodologies for quantifying the topographic effects. Consequently, the methodology to determine the topographic effect in seismic design of Korea was discussed preliminarily and suggested as the quantitative comparisons between one- and two-dimensional numerical models, together with the introduction and modification of current other codes.

      • 職業과 進路設計

        金忠起,方琦鎬 建國大學校 敎育硏究所 1988 論文集 Vol.12 No.-

        Most of us spend about half our working lives in some form of work. We would all be very fortunate and quite happy if we could say, as Mark Twain did of his occupation, "I don't consider writing to be work at all-it's just something I love to do so". Mark Twain's love affair with writing was not work, but pleasure. In his opinion, "work is that which a body is obliged to do. 'Play is that which a body is not obligeded to do. Whether your occupation is pleasurable is less a function of how much effort you put in than of how throughly you enjoy what you are doing. Work can be a positive or negative experience, depending on how it matches your need. As we are grown up, you need to have a vocation or occupation for your way of living. Then how to choose and plan your career in the future of your life? One of the most deepest urges of life is to grow. Especially as a human being, our work is a major expression of our life's energies; our careers must grow with us and fulfill our changing needs if we are to feel healthy, free, and fully alive. A career that fits like an expanding, flexible skin which you can breath, flex your intell-ectual or physical muscles, and develop your capacities and strength to the fullest is the goal of the career and life planning system presented in this paper. The happiest working people are those who have the opportunity and the courage to grow along with a sequences of jobs that respond to their changing interests and needs. For this reason it would be a vast underestimation to view this career planning solely as a scheme for getting a job effectively. This planning is quite effective at achieving that limited goal. The purpose and promise of this thesis is to help you develop a career that you throughly enjoy throughout your life in the future because it responds fully to your unique needs. Then you will derive fulfilment from your work in proportion to the effort you put into it, and it will become a love affair because you have chosen it freely. The heart of this study is to explore what you have capacities that will help you identify your most important desires, interest, and skills; formulate goals that are consistent with them; learn to distinguish fact from fantasy in the world of work; and design effective plan of action to pursue attain your goals. Finally, career planning opens the doors to a fully rewarding career. It frees you from fears that you are powerless in the future and gives you confidence to acknowledge you need to grow and change through your work, and power to fulfill that need.

      • 직업(職業)과 진로설계(進路設計)

        김충기 ( Choong Ki Kim ),방기호 ( Ki Ho Bang ) 건국대학교 교육연구소 1988 교사와 교육(구 교육논집) Vol.12 No.-

        Most of us spend about half our working lives in some form of work. We would all be very fortunate and quite happy if we could say, as Mark Twain did of his occupation, "I don`t consider writing to be work at all-it`s just something I love to do so". Mark Twain`s love affair with writing was not work, but pleasure. In his opinion, "work is that which a body is obliged to do. ‘Play is that which a body is not obligeded to do. Whether your occupation is pleasurable is less a function of how much effort you put in than of how throughly you enjoy what you are doing. Work can be a positive or negative experience, depending on how it matches your needs. As we are grown up, you need to have a vocation or occupation for your way of living. Then how to choose and plan your career in the future of your life? One of the most deepest urges of life is to grow. Especially as a human being, our work is a major expression of our life`s energies; our careers must grow with us and fulfill our changing needs if we are to feel healthy, free, and fully alive. A career that fits like an expanding, flexible skin which you can breath, flex your intellectual or physical muscles, and develop your capacities and strength to the fullest is the goal of the career and life planning system presented in this paper. The happiest working people are those who have had the opportunity and the courage to grow along with a sequences of jobs that respond to their changing interests and needs. For this reason it would be a vast underestimation to view this career planning solely as a scheme for getting a job effectively. This planning is quite effective at achieving that limited goal. The purpose and promise of this thesis is to help you develop a career that you throughly enjoy throughout your life in the future because it responds fully to your unique needs. Then you will derive fulfilment from your work in proportion to the effort you put into it, and it will become a love affair because you have chosen it freely. The heart of this study is to explore what you have capacities that will help you identify your most important desires, interest, and skills; formulate goals that are consistent with them; learn to distinguish fact from fantasy in the world of work; and design effective plan of action to pursue attain your goals. Finally, career planning opens the doors to a fully rewarding career. It frees you from fears that you are powerless in the future and gives you confidence to acknowledge you need .to grow and change through your work, and power to fulfill that need.

      • KCI등재

        논문 : 이차원 지반 유한요소 모델링을 통한 사면상부 지진지반운동의 지표면 지형효과 분석

        선창국 ( Chang Guk Sun ),방기호 ( Ki Ho Bang ),조완제 ( Wan Jei Cho ) 대한지질공학회 2015 지질공학 Vol.25 No.2

        지진지반운동 증폭을 야기하는 부지효과는 지하 토사 조건과 구조뿐만 아니라 지표 지형에 의해 지대한 영향을 받는다. 그럼에도 불구하고 국내에서는 최근 수십 년에 걸쳐 주로 지질 및 토사 조건과 관련된 부지고유 지진응답 연구들이 대부분을 차지해 왔으며, 이러한 국부 지질 효과는 잘 정립되어 현행 국내 내진설계기준들에 반영되고 있다. 이 연구에서는 현행 국내 내진설계기준에서는 고려되고 있지 않은 지표 지형효과 평가의 일환으로, 세 가지 다른 경사각 조건의 유한요소 지반 모델링을 통한 이차원 지진 부지응답 해석을 수행하였다. 이차원 유한요소 해석 결과인 최대 지반가속도와 가속도 응답스펙트럼을 추가적으로 수행한 일차원 유한요소 해석 결과와 비교하였다. 최대 지반가속도와 스펙트럴가속도는 대부분의 사면상부 영역에서 지형효과로 인해 이차원이 일차원 해석에 비해 크게 나타났다. Site effects resulting in the amplification of earthquake ground motion are strongly influenced not only by the subsurface soil conditions and structure, but also by the surface topography. Yet, over the last several decades, most studies of site-specific seismic responses in Korea have focused primarily on the seismic amplification associated with geologic and soil conditions. For example, the effects of local geology are now well established and have been incorporated into current Korean seismic design codes, whereas topographic effects have not been considered. To help address this shortcoming, two-dimensional (2D) seismic site response analyses, using finite element (FE) ground modeling with three different slope angles, were performed in order to assess the site effects of surface topography. We then compared our results, specifically peak ground acceleration (PGA) and acceleration response spectrum, to those of one-dimensional (1D) FE model analyses conducted alongside our study. Throughout much of the upper slope region, PGAs and spectral accelerations are larger in the 2D analyses than in the 1D analyses as a result of the topographic effect.

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