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원자력발전소 파워블럭에 대한 구조물-지반-구조물 상호 작용과 다양한 매개변수를 고려한 지진응답해석
서춘교,장동휘,정두리,장수혁,문일환 한국지진공학회 2018 한국지진공학회논문집 Vol.22 No.6
In this paper, we study the existing results of the structure-soil-structure interaction (SSSI) effect on seismic responses of structures and summarize important parameters. The parameters considered in this study are a combination of buildings in the power block of a nuclear power plant, the characteristics of earthquake ground motions and its direction, and the characteristics embedded under the ground. Based on these parameters, the seismic analysis model of the structures in the power block of the nuclear power plant is developed and the structure-soil-structure interaction analyses are performed to analyze the influence of the parameters on the seismic response. For all analyses, the soil-structure interaction (SSI) analysis program CNU-KIESSI, which was developed to enable large-sized seismic analysis, is used. In addition, the SSI analyses is performed on individual structures and the results are compared with the SSSI analysis results. Finally, the influence of the parameters on the seismic response of the structure due to the SSSI effect is reviewed through comparison of the analysis results.
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Hopf Bifurcation Index for Large Scale Power Systems
Aliakbar Mohammadi,Hamid Khaloozade,Roya Amjadifard 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.3
In this paper, we propose a novel index for the prediction of the Hopf bifurcation (HB) in power systems. The proposed index has strictly less processing load and less computation time in comparison to former HB indices. It also uses modern control properties of the power system such as system matrix and critical eigenvalue. Therefore, stochastic subspace system identification (SSSI) is used as a tool for estimation and prediction of the proposed HB index. Combining beneficial properties of SSSI methods and the processing advantages of the proposed index, we project a new algorithm for power system monitoring. The algorithm is easy and straight-forward. We conduct several test conditions for the proposed materials using 2-area 4-machine system, New England 10-Machine and IEEE 50-machine system. Simulation outcome expresses good performance of proposed index in comparison to former HB indices. The proposed index has fairly linear behavior, without discontinuities with re-spect to increases of system load. It also has less computation load.
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창의적 환경 측정도구들의 이론적 차원과 측정학적 타당성 검토
김혜숙(Hye-Sook Kim) 한국영재교육학회 2005 영재와 영재교육 Vol.4 No.1
본 연구는 창의적 환경을 측정하는 주요 측정도구들의 이론적 차원의 특성과 측정학적 타당성을 확인하고자 하는 데 목적이 있다. 이를 위하여 창의성과 혁신 관련 연구에서는 물론 실제 창의성과 관련된 작업 환경 분석에 활용되고 있는 측정도구들을 검토하였다. 분석의 대상이 된 척도들은 다음과 같다: CCQ(Creative Climate Questionaire), SOQ(Situational Outlook Questionnaire), KEYS(Assessing the Climate for creativity), TCI(Team Climate Inventory), SSSI(Siegel scale of Support for Innovation), 이들 측정 도구의 이론적 차원과 측정학적 특성을 검토하기 위하여 신뢰도(내적 일관성 및 재검사 신뢰도)와 타당도(요인분석, 준거타당도)를 확인하고 관련 연구들을 정리하였다. 창의성에 대한 환경적 요인의 영향력을 검증하는 기존의 측정도구들에 대한 면밀한 검토과정은 조직 및 학교의 창의성을 측정하는 관련 도구의 개발을 위한 연구와 개인의 창의적 능력 개발을 위한 교육 및 조직의 풍토 조성에 효과적으로 활용할 수 있을 것이다. This paper provdes a review of the measurements used in the study of organizational creativity. Five instruments were assessed (theoretical dimensions; reliability; validity): CCQ(Creative Climate Ouestionaire), SOQ(Situational Outlook Questionnaire), KEYS (Assessing the Climate for creativity), SSSI(Siegel scale of Support for Innovation), TCI(Team Climate Inventory).<BR> The paper concludes with a discussion of issues relating to the development of environments and climates for creativity and potential new directions for future methodological research.
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Pounding between adjacent buildings of varying height coupled through soil
Naserkhaki, Sadegh,El-Rich, Marwan,Aziz, Farah N.A. Abdul,Pourmohammad, Hassan Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.3
Pounding between adjacent buildings is a significant challenge in metropolitan areas because buildings of different heights collide during earthquake excitations due to varying dynamic properties and narrow separation gaps. The seismic responses of adjacent buildings of varying height, coupled through soil subjected to earthquake-induced pounding, are evaluated in this paper. The lumped mass model is used to simulate the buildings and soil, while the linear visco-elastic contact force model is used to simulate pounding forces. The results indicate while the taller building is almost unaffected when the shorter building is very short, it suffers more from pounding with increasing height of the shorter building. The shorter building suffers more from the pounding with decreasing height and when its height differs substantially from that of the taller building. The minimum required separation gap to prevent pounding is increased with increasing height of the shorter building until the buildings become almost in-phase. Considering the soil effect; pounding forces are reduced, displacements and story shears are increased after pounding, and also, minimum separation gap required to prevent pounding is increased.
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Pounding between adjacent buildings of varying height coupled through soil
Sadegh Naserkhaki,Marwan El-Rich,Farah N.A. Abdul Aziz,Hassan Pourmohammad 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.3
Pounding between adjacent buildings is a significant challenge in metropolitan areas because buildings of different heights collide during earthquake excitations due to varying dynamic properties and narrow separation gaps. The seismic responses of adjacent buildings of varying height, coupled through soil subjected to earthquake-induced pounding, are evaluated in this paper. The lumped mass model is used to simulate the buildings and soil, while the linear visco-elastic contact force model is used to simulatepounding forces. The results indicate while the taller building is almost unaffected when the shorter building is very short, it suffers more from pounding with increasing height of the shorter building. The shorter building suffers more from the pounding with decreasing height and when its height differs substantially from that of the taller building. The minimum required separation gap to prevent pounding is increased with increasing height of the shorter building until the buildings become almost in-phase. Considering the soil effect; pounding forces are reduced, displacements and story shears are increased after pounding, and also, minimum separation gap required to prevent pounding is increased.
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원심모형실험을 이용한 얕은 기초의 기초-지반-기초 상호작용: 실험적 접근
노린반,김재민,임재성,이창호 한국지반공학회 2018 한국지반공학회논문집 Vol.34 No.1
구조물-지반-구조물 상호작용을 확인하기 위하여 다양한 크기를 가지는 얕은 기초에 대하여 원심모형실험에 의한 진동대실험을 실시하고 결과를 분석하였다. 낙사법을 이용하여 지반을 조성하였으며, 두 기초의 이격 거리 및 매립에 따른 거동을 평가하였다. 원심모형실험 시 측정된 깊이별 지반 가속도는 입력 지진파의 크기가 증가함에 따라 증가하는 경향을 보였으며, 증폭 현상에 의하여 지표면에서 가장 큰 값을 보였다. 두 기초의 이격 거리가 줄어듦에 따라 구조물-지반-구조물 상호작용에 의하여 가속도 응답 스펙트럼 비(RRS)의 크기는 커지며, RRS 값이 최대가 되는 주기는 줄어 들었다. 동일한 이격 거리에서 기초가 지반에 매립될 경우, 두 기초의 RRS는 감소하는 경향을 보였다.
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