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Sung Jin Yang(梁承珍),Myung Soon Jun(全明純) 대한자원환경지질학회 1981 자원환경지질 Vol.14 No.3
Seismic risk mapg in Korea are made using Korean historical and modern earthquake data. The risk maps made by several methods are presented in contour line of vibratory ground motion (acceleration, velocity, and displacement). The methods used are Kawasumi (1951), Kanai (1668), and Hsich et al (1975) methods. The maps made by Kawasumi (1951) method represent the acceleration distribution on alluvial ground and those by Kanai (1968) method show the acceleration, velocity, and displacement at bed rocks. The risk analysis by the method of Hsich et al (1975) shows the probability of acceleration at each of soft, medium, and hard grounds in each of tectionic provinces in Korea.
Sung Jin Yang(梁承珍),Dae Young Ahn(安大榮) 대한자원환경지질학회 1986 자원환경지질 Vol.19 No.4
Accoustic impedances of subsurface layers are determined from the amplitudes of reflections from the layers. Densities of the layers can also be calculated from the accoustic impedances in case where velocities are known by velocity analysis of reflection data or any other method. The accoustic impedance is a good information for direct identification of the kind of some sub-surface material like coal or oil.
탄성파반사자료(彈性波反射資料)에서 지하물질(地下物質)의 음향계수(音響係數) 추출(抽出)
양승진,안대영,Yang, Sung-Jin,Ahn, Dae-Young 대한자원환경지질학회 1986 자원환경지질 Vol.19 No.4
Accoustic impedances of subsurface layers are determined from the amplitudes of reflections from the layers. Densities of the layers can also be calculated from the accoustic impedances in case where velocities are known by velocity analysis of reflection data or any other method. The accoustic impedance is a good information for direct identification of the kind of some subsurface material like coal or oil.
부지(敷地)의 지질조건(地質條件)과 지진위험도(地震危險度)와의 관계(關係)
양승진,전명순,Yang, Sung Jin,Jun, Myung Soon 대한자원환경지질학회 1981 자원환경지질 Vol.14 No.3
Seismic risk maps in Korea are made using Korean historical and modern earthquake data. The risk maps made by several method are presented in contour line of vibratory ground motion(acceleration, velocity, and displacement). The method used are Kawasumi (1951), Kanai (1968), and Hsich et al (1975) method. The maps made by Kawasumi (1951) method represent the acceleration distribution ground and those by Kanai (1968) method show the acceleration, velocity, and displacement at bed rocks, The risk analysis by the method of Hsich et al (1975) shows the probability of acceleration at each of soft, medium and hard grounds in each tectonic province in Korea.
반복적(反復的) 역산법(逆算法)에 의(依)한 중력자료(重力資料)의 해석(解析)에 관(關)한 연구(硏究)
노철환,양승진,신창수,Roh, Cheol-Hwan,Yang, Sung-Jin,Shin, Chang-Soo 대한자원환경지질학회 1989 자원환경지질 Vol.22 No.3
This paper presents results of interpretaton of gravity data by iterative nonlinear inversion methods. The gravity data are obtained by a theoretical formula for two-dimensional 2-layer structure. Depths to the basement of the structure are determined from the gravity data by four interative inversion methods. The four inversion methods used here are the Gradient, Gauss-Newton, Newton-Raphson, and Full Newton methods. Inversions are performed by using different initial guesses of depth for the over-determined, even-determined, and under-determined cases. This study shows that the depth can be determined well by all of the methods and most efficiently by the Newton-Raphson method.
유해수,양승진,Yoo, Hai-Soo,Yang, Sung-Jin 한국음향학회 1996 韓國音響學會誌 Vol.15 No.1
해양조사선 온누리호에 장착되어 있는 슬리브건 배열의 특성을 분석하였으며, 탐사 자료와 비교하였다. 주파수 영역엣 빔폭의 변화는 송이 배열인 경우, 814Hz가지는 $179.5^{\circ}$로 일정하며 814-1631Hz 주파수 범위에서는 급격히 빔폭이 좁아진다. 반면에 길이 및 폭배열인 경우, 고주파수대로 갈수록 빔폭이 좁아지며 이때의 최적 주파수는 69Hz이다. 수직면 방향성에서 주엽은 위상 각도 $0^{\circ}$에서 최대 진폭 0dB를 나타낸다. 부엽이 생성되지 않는 최적주파수 범위는 송이배열인 경우 1631Hz 미만이며, 길이 및 폭배열인 경우 108Hz 미만이다. 따라서 송이배열은 천부 지층의 고분해능 탐사에 적합하며, 길이 및 폭배열은 저주파수대 심부지질구조 탐사에 적합함을 나타낸다. 송이배열을 이용한 탄성파 단면도를 동일 측선에서 폭배열을 이용하여 획득한 탄성파 단면도와 비교하였다. Characteristics of sleeve-gun arrays installed on the R/V Onnuri were analyzed and compared with survey data. In the case of cluster array, the beam width in the frequency range up to 814Hz is constant as $179.5^{\circ}$, and rapidly narrows in the frequency range of 814-1631Hz. However, in the case of long and wide arrays, as the frequency increases, the beamwidth decreases. The optimal frequency is 69Hz. the main lobe of vertical inclination has its maximum amplitude at phase angle $0^{\circ}$. The optimal frequency of cluster array which produces little side lobe is less than 1631Hz, and those of long and wide arrays are less than 108Hz. As a result, the cluster array produces a good source for high-resolution seismic survey, while the long and wide arrays are suitable for the survey of deep structures. The final high-resolution seismic section with cluster array was compared with that of long and wide arrays.
Determination of Shallow Velocity-Interface Model by Pseudo Full Waveform Inversion
정상용,신창수,양승진,Jeong, Sang Yong,Shin, Chang Soo,Yang, Seung Jin The Korean Society of Economic and Environmental G 1995 자원환경지질 Vol.28 No.5
본 논문에서는 탄성파 굴절법 탐사자료를 이용하여 천부지층의 속도와 심도를 결정하기 위한 새로운 접근방법을 소개한다. 굴절법 자료로부터 초동을 발췌한 후 실제 합성단면도를 이러한 초동의 시간이동에 해당하는 단위 델타 함수로 대치할 수 있다고 가정하였다. 주시의 계산은 발사법 파선추척을 이용하였다. 감쇠 최소자승법의 적용을 위한 편미분치의 계산은 이론주시의 계산과 동시에 해석적으로 구하였다. 본 역산법은 합성자료와 현장자료에 적용하여 성공적인 결과를 가져왔으며, 초기 가정 모델이 실제 모델과 많이 다르더라도 저주파수 대역에서 매우 양호한 결과를 보여주는 장점을 지닌다. This paper presents a new approaching method to determine the velocity and geometry of shallow subsurface from seismic refraction events. After picking the first breaks from seismic refraction data, we assume that field refraction seismogram can be replaced by the unit delta function having time shift of first break. Time curves are generated by shooting ray tracing. The partial derivatives seismogram for a damped least squares method is computed analytically at each step of the forward ray tracing. The technique is successfully tested on synthetic and real data. It has the advantage of real full waveform inversion, which is robust at low frequency band even if the initial guess is far from the true model.
주파수영역에서 49점 가중평균을 이용한 scalar 파동방정식의 유한차분식 정확도 향상을 위한 연구
장성형,신창수,양동우,양승진,Jang, Seong Hyung,Shin, Chang Soo,Yang, Dong Woo,Yang, Sung Jin 대한자원환경지질학회 1996 자원환경지질 Vol.29 No.2
Much computing time and large computer memory are needed to solve the wave equation in a large complex subsurface layer using finite difference method. The time and memory can be reduced by decreasing the number of grid per minimun wave length. However, decrease of grid may cause numerical dispersion and poor accuracy. In this study, we present 49 points weighted average method which save the computing time and memory and improve the accuracy. This method applies a new weighted average to the coordinate determined by transforming the coordinate of conventional 5 points finite difference stars to $0^{\circ}$ and $45^{\circ}$, 25 points finite differenc stars to $0^{\circ}$, $26.56^{\circ}$, $45^{\circ}$, $63.44^{\circ}$ and 49 finite difference stars to $0^{\circ}$, $18.43^{\circ}$, $33.69^{\circ}$, $45^{\circ}$, $56.30^{\circ}$, $71.56^{\circ}$. By this method, the grid points per minimum wave length can be reduced to 2.5, the computing time to $(2.5/13)^3$, and the required core memory to $(2.5/13)^4$ computing with the conventional method.
장혁준(Hyuk Jun Jang),양승진(Sung Jin Yang),신창수(Chang Soo Shin) 대한자원환경지질학회 1990 자원환경지질 Vol.23 No.3
This paper presents numerical experiments on migration of synthetic seismograms using by 45° wave equation. The seismograms used are zero-offset seismogram (corresponding to stacked section) on point reflectors, dipping plane reflector, faulted and folded layers. The seismograms are constructed by upward continuation of seismic source wavelets, exploading on subsurface reflection interfaces, to the earth surface. The synthetic seismograms are migrated by downward continuation and imaging. The upward and downward continuations are implemented by solving the 45° wave equation with the finite-difference method. Migration of the synthetic data used in this study results in relatively accurate reposition of subsurface structures while the synthetic sections are quite different from the structures.