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민경원,서백수,진호일,임길재 강원대학교 부설 석재복합신소재 제품연구센터 2000 석재연 논문집 Vol.5 No.-
화강암의 조직을 고려하여 4개지역에서 6개 석ㆍ골재 석산을 대상으로 신선한 화강암과 풍화된 화강암을 Ⅰ ~ Ⅵ단계까지 체계적으로 채취된 화강암을 대상으로 풍화에 따른 화강암의 물리적ㆍ화학적 특성 변화에 대한 고찰(민경원 등, 1998)에 추가하여, 풍화에 의한 slake 내구성과 색도의 변화를 측정하고 토의하였다. slake 내구성 시험에서는 일반적으로 Ⅰ~Ⅲ 단계의 화강암이 시험 주기가 증가할수록 선형적이 질량감소를 보이고 Ⅳ~Ⅵ 단계에서는 곡선 모양의 감소 경향을 보여주면 세립질의 화강암이 상대적으로 높은 내구성을 가진다. 풍화에 따라 암석의 백색도는 감소하고 황색도는 증가하며, 표준화된 백색도-황생도 지수는 풍화단게를 지시해 줄 수 있는 유용한 지시자로 제안되었다. Fresh and weathered granitic rocks of grades Ⅰ to Ⅵ were sampled systematically from six stone and aggregate quarries in four chosen areas in consideration of their textures. In addition to the observed variations. of physical and chemical properties of granitic rocks in terms of weathering grades(Min et al., 1998), slake durability and color index variations were measured and discussed in this article. In the slake durability test, generally with increasing test cycles the granitic rocks of grades Ⅰ to Ⅲ show linear losses of weight but those of Grades Ⅳ to Ⅴ show curvilinear trends, and the fine-grained weathered granitic rocks have comparatively higher durability. As weathering proceeds, whiteness of rocks decreases and yellowness increases. A normalized whiteness-yellowness index is suggested as a weathering index to be one of useful indicators of weathering grades.
민경원,강상훈 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.5
This paper deals with the controller design to drive a shaking table with one's intended motion, and also system identification of a building model, which is mounted on a shaking table. Reference signal, by which the shaking table is driven, differs from its response in amplitude and phase. Therefore, for driving the shaking table in accordance with its reference signal, there is a need for the dynamic characteristic between the reference signal and the shaking table to be cancelled. To cancel this dynamic characteristic of the shaking table, the controller using its inverse transfer function is designed. Also, the stiffness and damping coefficients of the building model are identified with acceleration data, which are measured from accelerometers attached at the shaking table and each story of the building model.