• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 1999년도 춘계 공동학술발표회
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• pp.116-119
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• 1999

Amplification factor spectrum, using the observed strong ground motions database in the Korean Peninsula, has been obtained and compared with Standard Response Spectrum, which was suggested by United States Nuclear Regulatory Committee. The observed und motions from the Yongwol and the Kyoungju, and the other recent Earthquakes, respectively, which ate supposed to represent domestic seismotectonic characteristics such as seismic source, attenuation of the propagation medium, and site specific effect, are used for the analysis of amplification factor spectrum. The database are slightly different from the those of the second study. Amplification factors hue been calculated by comparing the observed peak ground motions with results from responses to the observed horizontal na vertical ground motions. The comparison have shown that the amplification factors resultant from this study exceeds these of Standard Response Spectrum, The results suggest that the characteristics of seismic strong ground motion, which are supposed to represent the domestic seismotectonic characteristics, differs from those of Standard Response Spectrum, especially at higher frequencies. The results from the 2nd study are similar to those of 1st analysis.

• 한국지진공학회논문집
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• 제1권1호
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• pp.25-29
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• 1997

실제 관측된 강지진동을 이용하여 증폭요소 스펙트럼을 구하였으며 그 결과를 미국에서 개발된 표준응답 스펙트럼과 비교 및 분석하였다. 본 연구를 위하여 국내의 지진지체구조특성을 충분히 대표 가능한 지진을 선택하였으며 구체적으로 Miramichi, Nahanni, Saguenay 및 New Madrid Earthquake (19 수직성분, 36 수평성분)으로부터 관측된 강지진동을 증폭요소 스펙트럼 분석에 이용하였다. 국내의 지진지체구조특성을 충분히 대표 가능한 지진으로부터 강지진동을 처리하여 수평 및 수직성분에 대한 응답을 계산하고 응답결과를 각각의 성분에 대하여 실제 관측된 강지진동값과 비교를 통하여 증폭요소 스펙트럼을 구하였다. 구하여진 증폭요소 스펙트럼을 미국에서 개발된 표준응답 스펙트럼과 비교 분석한 결과 수평 및 수직성분 공통적으로 약 10Hz 이상의 대역에서 본 연구로부터 구하여진 증폭요소 스펙트럼이 표준응답 스펙트럼에서 제시된 값보다 더 초과하고 있음을 보여주었다. 이러한 결과는 국내의 지진지체구조를 대표하는 지진이 향후 발생하여 이 지진으로부터 관측가능한 강지진동을 이용하여 응답스펙트럼을 분석할 경우 특히 약 10Hz 이상의 대역에서 구하여진 증폭요소 스펙트럼이 표준응답 스펙트럼이 제시한 값보다 초과할 가능성이 있음을 의미한다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1998년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Spring 1998
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• pp.407-412
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• 1998

Amplification factor spectrum, using the observed strong ground motions database, has been obtained and compared with Standard Response Spectrum, which were suggested by US NRC. The observed ground motions from the Yongwol and the Kyoungju Earthquake, respectively, which are suppose to represent domestic seismotectonic characteristics such as seismic source, attenuation, and site effect, are used for the analysis of amplification factor spectrum. Amplification factors have been calculated by comparing the observed peak ground motions with results from responses to the observed horizontal and vertical ground motions. The comparison shows that the amplification factors resultant from this study exceeds those of Standard Response Spectum at relatively higher frequencies. The results suggest that the characteristics of the seismic strong ground motion, which are supposed to represent the domestic seismotectonic characteristics, differs from those of Standard Response Spectrum, especially at hither frequencies

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1999년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Spring
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• pp.57-60
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• 1999

Amplification factor spectrum using the observed strong ground motions database in the Korean Peninsula has been obtained and compared with Standard Rpectrum which wa suggested by United States Nuclear Regulatory Committee. The observed ground motions from the Yongwol and the Kyoungju Earthquakes respectively which are supposed to represent domestic seismotectonic characteristics such as seismic source attenuation of the propagation meium and site specific effect are used for the analysis of amplification factor spectrum,. The database are slightly different from the those of the second study. Amplification factors have been calculated by comparing the observed peak ground motions with results from responses to the observed horizontal na vertical ground motions. The comparison have shown that the amplification factors resultant from this study exceeds those of Standard Response Spectrum The results suggest that the characteristics of seismic strong ground motion which are supposed to represent the domestic seismotectonic characteristics differs from those of Standard Response Spectrum especially at higher frequencies. The results from the 2nd study are similar to those of 1st analysis.

• 한국지진공학회논문집
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• 제24권3호
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• pp.123-128
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• 2020

Analysis of the 2016 Gyeongju earthquake and the 2017 Pohang earthquake showed the characteristics of a typical high-frequency earthquake with many high-frequency components, short time strong motion duration, and large peak ground acceleration relative to the magnitude of the earthquake. Domestic nuclear power plants were designed and evaluated based on NRC's Regulatory Guide 1.60 design response spectrum, which had a great deal of energy in the low-frequency range. Therefore, nuclear power plants should carry out seismic verification and seismic performance evaluation of systems, structures, and components by reflecting the domestic characteristics of earthquakes. In this study, high-frequency amplification factors that can be used for seismic verification and seismic performance evaluation of nuclear power plant systems, structures, and equipment were analyzed. In order to analyze the high-frequency amplification factor, five sets of seismic time history were generated, which were matched with the uniform hazard response spectrum to reflect the characteristics of domestic earthquake motion. The nuclear power plant was subjected to seismic analysis for the construction of the Korean standard nuclear power plant, OPR1000, which is a reactor building, an auxiliary building assembly, a component cooling water heat exchanger building, and an essential service water building. Based on the results of the seismic analysis, a high-frequency amplification factor was derived upon the calculation of the floor response spectrum of the important locations of nuclear power plants. The high-frequency amplification factor can be effectively used for the seismic verification and seismic performance evaluation of electric equipment which are sensitive to high-frequency earthquakes.

• 한국지진공학회논문집
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• 제1권4호
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• pp.37-43
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• 1997

여러 가지 진동원으로부터 전파되는 진동으로 인하여 진동폐해민원이 계속적으로 증가하는 추세에 있으나 이에 대한 진동규제기준이 미흡한 상태이다. 진동피해의 예측이나 경감방안을 마련하기 위해서 간편하고 실용적인 진동예측이 절실한 상태이다. 본 연구에서는 Newmark와 Hall이 제시한 증폭계수의 개념을 도입한 응답스펙트럼을 이용하여 쉽게 진동을 예측할 수 있는 기법을 제시하고 그 적용성을 검토하고자 한다. 이를 위하여 운행중인 지하철 구조물 내부 및 지상과 건물에서의 진동을 측정하였으며 제시된 방법으로 분석한 결과 본 방법이 진동예측에 손쉽게 적용될수 있음을 보여 주었다.

• Earthquakes and Structures
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• 제13권1호
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• pp.17-27
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• 2017

In this study, the characteristics of site amplification at seismic observation stations in Japan were estimated using the attenuation relationship of each station's response spectrum. Ground motion records observed after 32 earthquakes were employed to construct the attenuation relationship. The station correction factor at each KiK-net station was compared to the transfer functions between the base rock and the surface. For each station, the plot of the station correction factor versus the period was similar in shape to the graphs of the transfer function (amplitude ratio versus period). Therefore, the station correction factors are effective for evaluating site amplifications considering the period of ground shaking. In addition, the station correction factors were evaluated with respect to the average shear wave velocities using a geographic information system (GIS) dataset. Lastly, the site amplifications for specific periods were estimated throughout Japan.

• Structural Engineering and Mechanics
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• 제42권1호
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• pp.121-129
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• 2012

All contemporary seismic Codes have adopted smooth design acceleration response spectra, which have derived by statistical analysis of many elastic response spectra of natural accelerograms. The above smooth design spectra are characterized by two main branches, an horizontal branch that is 2.5 times higher than the peak ground acceleration, and a declining parabolic branch. According to Eurocode EN/1998, the period range of the horizontal, flat branch is extended from 0.1 s, for rock soils, up to 0.8 s for softer ones. However, from many natural recorded accelerograms of important earthquakes, the real spectral amplification factor appears to be much higher than 2.5 and this means that the spectrum leads to an unsafe seismic design of the structures. This point is an issue open to question and it is the object of the present study. In the present paper, the spectral amplification factor of the smooth design acceleration spectra is re-calculated on the grounds of a known "reliability index" for a desired probability of exceedance. As a pilot scheme, the seismic area of Greece is chosen, as it is the most seismically hazardous area in Europe. The accelerograms of the 82 most important earthquakes, which have occurred in Greece during the last 38 years, are used. The soil categories are taken into account according to EN/1998. The results that have been concluded from these data are compared with the results obtained from other strong earthquakes reported in the World literature.

• Journal of Photoscience
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• 제9권2호
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• pp.338-340
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• 2002

In broom sorghum, Sorghum bicolor Moench, UV causes anthocyanin synthesis having action peaks in UVA and UVB regions. We previously reported that UV induces anthocyanin synthesis through UVB photoreceptor and phytochrome activated by UV. Furthermore, UVA and UVB amplify phytochrome-induced anthocyanin synthesis (PIAS). Our action- spectroscopic research indicated that a UV -receptor for amplification of PIAS is likely to be the same or same type of UVB photoreceptor for induction of anthocyanin synthesis. UVA-amplification of PIAS can be explained by the action of a cryptic red light signal (CRS), an amplification factor for PIAS produced by a distinct phytochrome-species activated by UVA. We suggest that UVA photoreceptors are not involved in anthocyanin synthesis in the broom sorghum.

• 한국지반공학회논문집
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• 제36권11호
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• pp.21-33
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• 2020

본 연구에서는 국내 내진설계기준 공통적용사항(MOIS, 2017)의 지반증폭계수를 활용하여 지표면 최대가속도를 산출하는 방법의 적절성을 검토하기 위해 포항지역 전역의 시추공을 대상으로 1차원 등가선형해석프로그램을 통해 지반응답해석을 수행하였다. 지반응답해석을 위한 지진파는 내진설계기준 공통적용사항에 따라 지진 재현주기 500년, 1000년, 2400년의 표준설계응답스펙트럼에 맞추었고, 지반데이터는 국토지반정보 포털시스템을 활용하여 확보하였다. 그 결과 내진설계기준 공통적용사항에서 제시하는 응답스펙트럼과 지반응답해석에서 얻어진 응답스펙트럼은 지반분류에 상관없이 대략적으로 일치하는 것을 알 수 있었다. 하지만, 증폭계수를 활용하여 지표면최대가속도를 산출할 경우 지반응답해석에서 얻어진 결과와 상당한 차이를 나타내는 것을 알 수 있었다.