• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1998년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Spring 1998
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• pp.180-187
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• 1998

One of the major difficulties in the seismic analysis of a dam-reservoir system is the treatment of the energy radiation in the upstream direction of the reservoir. In this paper a new transmitting boundary is presented that can model properly the radiation of energy in the far field direction of a semi-infinite reservoir with constant depth. In the newly developed method, effects of surface wave motion are taken into account and the reservoir-foundation interaction is approximately accounted for with an absorbing boundary condition. If a dam has vertical upstream face and the infinitely long reservoir maintains constant depth, then the proposed transmitting boundary can be directly coupled with the model of dam body. In present study, the dam body is assumed to behave elastically and modeled by finite element method. Seismic responses of a dam model are investigated using the newly developed transmitting boundary.

• 한국지진공학회논문집
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• 제3권1호
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• pp.123-132
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• 1999

댐-호소 계의 지진응답해석에 있어서의 어려운 문제 중 하나는 댐 상류방향으로의 에너지 방사를 적절하게 처리하는 것이다 본 논문에서는 깊이가 일정한 호소 원역으로의 에너지 방사를 잘 모델링할 수 있는 전달경계를 제시하였다 개발된 방법에서 수면파의 영향을 고려하였으며 호소-지반의 상호작용을 근사적으로 표현할수 있는 흡수경계조건도 도입하였다 댐과 호소의 경계면이 지표면에 수직하고 호소의 깊이가 일정할 경우에는 제안된 전달경계를 댐체의 모델에 직접 연결할 수 있다 댐체는 선형탄성거동을 가정하여 유한요소로 모델링 하였다 얻어진 댐-호소 계의 운동방정식을 이용하여 댐의 지진응답특성을 조사하였다

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1999년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Spring
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• pp.267-274
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• 1999

Since the seismic response of dams can be strongly influenced by the dam-reservior interaction in needs to be taken into account in the seismic design of dams. In general a substructure method is employed to solve the dam-reservoir interaction problem in which the dam body is modeled with finite elements and the infinite region of a reservoir using a transmitting boundary. When the water is modeled as a compressible fluid the equation is formulated in frequency domain. But nonlinear behavior of dam body cannot be studied easily in the frequency domain method. In this study time domain formulation of the dam-reservoir-soil interaction is proposed based onthe lumped parameter modeling of the reservoir region, The frequency dependent dynamic-stiffness coefficients of the reservoir are converted into frequency independent lumped-parameters such as masses dampers and springs. The soil-structure interactionis modeled using lumped parameters in similar way. the ground is assumed as a visco-elastic stratum on the rigid bedrock. The dynamic stiffnesses of the rigid surface foundation are calculated using the hyperelement method and are converted into lumped parameters. The application example demonstrated that the lumped parameter model gives almost identical results with the frequency domain formulation.

• 대한토목학회논문집
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• 제36권2호
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• pp.245-258
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• 2016

본 연구에서는 미 공병단의 내부 침식 평가 도구를 이용하여 서로 다른 결함 이력을 가진 국내 3개소의 필댐에 대해 내부 침식에 의한 지반공학적 파괴 시나리오의 시스템 응답 확률을 분석하였다. 분석된 확률을 국외 사례에서 조사된 시스템 응답 확률의 범위 및 국내 댐의 과거 사고 통계와 비교 분석하였다. 연구 대상 댐에서 구조물 인접부의 내부 침식 파괴에 대한 시스템 응답 확률은 최대 $10^{-5}$ 수준으로 다른 파괴 시나리오에 대한 값보다 상대적으로 매우 높게 평가되었으며, 실제 국내에서도 구조물 인접부에서 가장 빈번하게 내부 침식 사고가 발생하였다. 하지만 국외에서는 빈번하게 발생하는 기초 지반을 통한 내부 침식과 관련된 파괴 시나리오의 지반공학적 시스템 응답 확률은 상당히 낮은 수준의 $10^{-7}$으로 평가되었다. 이는 실제 국내에서 기초 지반을 통한 내부 침식으로 인해 발생한 댐 파괴 사례가 거의 전무하다는 사실과 유사한 결과이다.

• Structural Engineering and Mechanics
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• 제33권4호
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• pp.407-428
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• 2009

The effects of the uniform and spatially varying ground motions on the stochastic response of fluid-structure interaction system during an earthquake are investigated by using the displacement based fluid finite elements in this paper. For this purpose, variable-number-nodes two-dimensional fluid finite elements based on the Lagrangian approach is programmed in FORTRAN language and incorporated into a general-purpose computer program SVEM, which is used for stochastic dynamic analysis of solid systems under spatially varying earthquake ground motion. The spatially varying earthquake ground motion model includes wave-passage, incoherence and site-response effects. The effect of the wave-passage is considered by using various wave velocities. The incoherence effect is examined by considering the Harichandran-Vanmarcke and Luco-Wong coherency models. Homogeneous medium and firm soil types are selected for considering the site-response effect where the foundation supports are constructed. A concrete gravity dam is selected for numerical example. The S16E component recorded at Pacoima dam during the San Fernando Earthquake in 1971 is used as a ground motion. Three different analysis cases are considered for spatially varying ground motion. Displacements, stresses and hydrodynamic pressures occurring on the upstream face of the dam are calculated for each case and compare with those of uniform ground motion. It is concluded that spatially varying earthquake ground motions have important effects on the stochastic response of fluid-structure interaction systems.

• 조명전기설비학회논문지
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• 제28권1호
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• pp.105-113
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• 2014

Currently, the energy consumption rate in buildings is approximately 28.5% of the total energy consumption in Korea. Therefore the amount of the consumption of petroleum resourses is at a worrying level of the blackout. The system of the amount of the Architectural Energy Efficiency Grade [AEEG] is in force by the government to apply the technologies of the Emissions Trading System and the Target Management System to mitigate the Green House Gases for buildings according to the climate change. On the account the mitigation of the Green House Gases and the reduction of the energy, from the view of maintenance and management, for the new and remodeling buildings should be under consideration. The author wants to present the possible ways how to improve the AEEG for the existing buildings by trying to establish the foundation of the BEMs, and by confirming the potential of the energy savings.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회 논문집
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• pp.44-51
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• 2005

Water flow in rivers during flood season can be 10 to 100 fold higher than normal seasons (low precipitation) in Japan and predicting flood runoff is essential for operating reservoirs with discharging gates. Abundant experiences and knowledge are requisites for operators to be able to make efficient decisions at work. This research investigated a method to transfer technical knowledge by acquiring skills and knowledge from actual dam operators and by using the information to construct an educational training system. The purpose of the research was to enable the execution of a secure and rational reservoir operation during flood period. The educational training system for reservoir operation was developed with the focuses on acquiring knowledge on hydraulics and hydrology and learning about decision making related to the reservoir operation as well as the timing of control. The system is capable of conducting education that corresponds to individual levels in each location. Of the educational training methods, a lecture method that uses textbooks is effective for the understanding of basic knowledge and concepts while a training method that uses a simulation device is essential for the practice of advanced and specialized procedures in specific fields. Simulation devices are used in operational training for airplane flight and driving cars and trains. The educational system presented here was designed to provide further assistance to those who have acquired basic knowledge and concepts through textbooks and also to at low them to perform the satisfactory operation of dam equipment. Our research proposes a method which can realize a system to acquire technical skills-the skills which are the foundation of technical knowledge and operation.

• 한국지반환경공학회 논문집
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• 제19권5호
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• pp.13-22
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• 2018

The number of researches on the mechanical properties of cemented sand and gravel (CSG) materials and the application of the CSG Dam has been increased. In order to explain the technical scheme of strength prediction model about the artificial neural network, we obtained the sample data by orthogonal test using the PVA (Polyvinyl alcohol) fiber, different amount of cementing materials and age, and established the efficient evaluation and prediction system. Combined with the analysis about the importance of influence factors, the prediction accuracy was above 95%. This provides the scientific theory for the further application of CSG, and will also be the foundation to apply the artificial neural network theory further in water conservancy project for the future.

• 동양고전연구
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• 제37호
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• pp.217-248
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• 2009

조선후기 통신사 파견을 통해 일본에 현존하는 필담창수집(筆談唱酬集)은 과거 한일 양국의 성신교린(誠信交隣)을 확인할 수 있는 귀중한 역사적 기록물이다. 그 중에는 당시 양국 의원(醫員)들 간의 만남을 통해 이루어진 필담도 상당수 포함되어 있다. 본 연구자는 제목에 '~ 록(錄)', '~ 의담(醫談)', '~ 필어(筆語)'가 포함된 필담창수집 중 의학필담을 중심으로 형식과 내용이 어떤 상호 관련을 맺고 있는가를 살펴보았다. '~ 록'은 중요 사실을 기록한 다른 텍스트의 부록이거나 해당 텍스트 내용 일부분에 의학필담을 부수적으로 담고 있다. 이들 텍스트는 양국간 생생한 교류 흔적을 담고 있으며, 의학필담도 핵심적 내용만 짧은 분량으로 요약되어 그 사료적 중요성이 크다. '~ 의담'은 당시 양국 의원을 중심으로 진행된 의학적 담화 내용만을 본격적으로 정리한 의학필담집이다. 이들은 일본 의원의 치험례 정리 및 확인으로부터 의론(醫論) 강화를 통한 적극적 의견 개진으로 변화되는 각 시기 의학적 주요 관심사의 변천 흐름을 잘 보여주는 자료이다. '~ 필어'의 특성은 현장감 강화를 위한 대화 방식이다. '필어'의 의미에도 암시되어 있듯이 신변잡기적 내용까지 빠짐없이 기록하여 현장감이라는 필담의 성격을 보다 명확하게 규정하고 있다. 또한 약물과 병증중심의 의학 관련 필담과 박물학적 내용 위주로 구성되어 있고, 시문(詩文)은 의원들과 관련된 작품들만 수록함으로써 '록'의 기록성과 '의담'의 분화적 성격을 함께 지닌 특성을 잘 보여주는 텍스트이다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제27권2호
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• pp.36-40
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• 2022

To respond to rapidly changing water circumstances such as climate change, drought, etc., the korean government (MOE) established four advanced strategies for integrated groundwater management. The first strategy is watershed-based management of groundwater. The second strategy is total quantity management of groundwater including improvement of groundwater preservation area policy and procedure of investigation for groundwater influence area, additional construction of groundwater dam, installation of large-scale public wells, extention of spilled groundwater use. The third strategy is prevention of groundwater contamination including expansion of monitoring wells, introducing declaration of groundwater contamination. The last strategy is advancement of groundwater information management including integrated management of data, setting up a big-data based open platform. The above-mentioned four strategies will be reflected in the 4th National Groundwater Management Plan to secure implementation power, and it is expected to laid the foundation for advanced and rational groundwater management system.