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미분구적법에 의한 탄성지반상의 열림 균열을 가진 EUler-Bernoulli보의 진동 해석
신영재(Youngjae Shin),황기섭(Kisup Hwang),윤종학(Jonhak Yun),노엘(N. M. Dioyan) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, Generalized Differential Quadrature Method is applied vibration analysis of Euler-Bernoulli beam with open cracks on elastic foundation. The natural frequencies of Euler-Bernoulli beam with open cracks on elastic foundation were obtained and analyzed for various boundary conditions by using the Generalized Differential Quadrature Method. The concepts of Generalized Differential Quadrature Method were briefly introduced. The cracks are modeled by massless substitute spring. The effects of the crack location, size and the foundation constants, on the natural frequencies of the beam, are investigated.
충적대수층 지역에서의 계간축열 지열냉난방시스템 적용 연구
박성민(Sungmin Park),황기섭(Kisup Hwang),문종필(Jongphil Mon),민동민(Dongmin Min) 한국지열·수열에너지학회 2018 한국지열에너지학회논문집 Vol.14 No.3
In this paper, we designed a seasonal geothermal storage system and studied the applicability in the alluvial aquifer. We conducted a basic survey to apply this system to greenhouses actually operated in the Geum river basin alluvial aquifer. After choosing a potential area through electrical resistivity survey, the system parameters were set using drilling survey and pumping test result. We installed a system based on the factors, and operated for about 9 months. As a result, high temperature water(injection temperature 30℃) was stored at 22.5 Mcal (1,609 m³) for 3 months in cooling operation and 125 Mcal (16,960 m³) of low temperature water (injection temperature 7℃) were stored for 6 months in the remaining heating operation.