• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.104.1-104.1
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• 2012

달표면 표토의 평균 입자크기와 성숙도(maturity)는 달 연구 및 탐사에 있어 중요한 정보이다. 표토의 성숙도는 탐사하는 지역의 형성시기에 대한 정보를 제공하고, 평균입자크기는 달 탐사 로보의 설계에 중요한 정보로 쓰이기 때문이다. 우리는 달표면 표토의 평균입자크기와 성숙도를 측정하기 위하여 경희대학교 천문대에서 12cm 굴절망원경과 정방형 2k CCD를 이용하여 $633{\mu}m$ 파장의 편광관측을 수행하였다. 관측의 공간 분해능은 달의 중심부에서 2.89km/pixel이다. 달표면에서 산란된 빛의 편광도는 달표면 표토의 평균입자크기를 알 수 있는 중요한 정보가 된다. 표토의 평균입자크기는 최대편광도와 알비도에 관계되기 때문에 편광관측과 알비도 관측으로부터 평균입자크기를 측정할 수 있다. 표토의 평균입자크기는 시간이 지남에 따라서 점점 작아지는데, 이는 표토가 미세운석체의 충돌에 오랜 시간 동안 노출되어 있기 때문이다. 미세운석체의 충돌은 달표면에서 고르고 지속적으로 일어났기 때문에, 표토의 평균입자크기를 알 수 있다면 표토가 얼마나 오랫동안 달표면에 노출되었는지를 나타내는 성숙도를 측정할 수 있다. 우리는 편광관측을 통하여 처음으로 달표면 전체의 평균입자크기의 분포를 측정하였고, 그로부터 표토의 성숙도를 추정했다.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 1999.04a
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• pp.93-99
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• 1999

조화진동하는 점진원에 의한 반무한 탄성체의 응답해석을 수행해 탄성체의 임의의 깊이에서의 응답을 나타내는 계산식을 유도했다 이결과는 최근 연구개발이 진행되고 있는 조화진원에 의한 정밀 지하구조탐사에 중요한 이론적 바탕이 된다. 먼저 실용상 중요한 수평가진에 의한 응답을 계산했다 표면에 큰 응답이 표면파의 형태로 발생하지만 수평진원의 에너지 방사형태는 지향성을 가지고 있어 진원아래의 원뿔형의 영역이 크게 여기된다는 사실을 밝혔다.

• The Journal of the Petrological Society of Korea
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• v.19 no.4
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• pp.245-254
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• 2010

Technology of surface investigation using X-ray is one of widely used technology nowadays. This technique has been numerously used for planetary surface investigations for both orbital and rover scientific instruments. Korea has a plan to send an orbiter and lander to the Moon by the early 2020s. Therefore, the time has come for Korean researchers to develop major scientific instruments and start to do research on basic research for the Moon. Because of this situation, we firstly investigate X-ray technology, which is essential as one of core techniques of planetary remote sensing from the orbit and ground. This paper presents the current status of planetary exploration using X-ray techniques and new development of worldwide X-ray technology which could be adapted for prospective planetary missions.

• 한국지구물리탐사학회:학술대회논문집
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• 2004.06a
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• pp.238-246
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• 2004

• Korean Journal of Remote Sensing
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• v.33 no.3
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• pp.313-324
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• 2017

A lava tube is one of the hot issues of lunar science because it is regarded as a good candidate place for setting a lunar base. Recently much effort has been made to find lunar lava tubes. However, preceding works mainly made use of high-resolution lunar surface image data in conjunction with geomorphological consideration to present some lava tube candidates. Yet, those candidates stay no more than indirect indications. We propose a new data analysis technique of High Frequency (HF) radar observation data to find lunar lava tubes of which location depth is smaller than the range resolution of the radar pulse. Such shallow target echoes cannot be resolved from surface echoes, which presents the different location of the lunar surface compared to that of real lunar surface. The proposed technique instead finds the surface range (distance from LRS to the reflector of the most intense signal) anomaly which occurs as a result of the low range resolution of LRS pulse. We applied this technique to the surface range of Kaguya Lunar Radar Sounder (LRS) data. The surface range was deduced to make LRS surface elevation which was compared with the average surface elevation of Kaguya Digital Terrain Model (DTM). An anomalous discrepancy of the surface elevation was found in the Rima Galilaei area, which suggests the existence of a shallow lava tube.

• Geophysics and Geophysical Exploration
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• v.9 no.1
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• pp.93-101
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• 2006

In this study, we propose a joint inversion method, using genetic algorithms, to determine the shear-wave velocity structure of deep sedimentary layers from receiver functions and surface-wave phase velocity. Numerical experiments with synthetic data indicate that the proposed method can avoid the trade-off between shear-wave velocity and thickness that arises when inverting the receiver function only, and the uncertainty in deep structure from surface-wave phase velocity inversion alone. We apply the method to receiver functions obtained from earthquake records with epicentral distances of about 100 km, and Rayleigh-wave phase velocities obtained from a microtremor array survey in the Kanto Plain, Japan. The estimated subsurface structure is in good agreement with the previous results of seismic refraction surveys and deep borehole data.

• Journal of the Korean Geotechnical Society
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• v.28 no.8
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• pp.55-63
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• 2012

The evaluation of shear modulus (or shear wave velocity) profile of the site is very important in various fields of geotechnical engineering and various surface wave methods have applied to determine the shear wave velocity profiles and showed good performance. Surface wave methods evaluate the dispersion curve in the field and determine the shear wave velocity profile through the inversion process. In this paper, the automated inversion process using the genetic algorithm is developed for HWAW method which is one of surface wave methods recently developed. The proposed method uses the error function based on the wavelength domain dispersion curve and can determine the reliable shear wave velocity profile not only in shallow depth but also in deep depth. To estimate the validity of the proposed method, numerical simulations and field test were performed and the proposed method was applied to determine the shear wave velocity profiles. Through the numerical simulations and field applications, the promising potential of the proposed method was verified.

• The Science & Technology
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• v.30 no.8 s.339
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• pp.16-18
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• 1997

화성에는 과연 생명체가 존재하는가. 지프형 탐사로봇 소저너가 화성표면의 토양샘플을 분석해서 지구로 알려옴으로써 화성의 신비가 점차 풀려지고 있다. NASA는 늦어도 2018년까지는 인간의 화성착륙을 목표로 탐사작업을 계속하고 있다.

• 한국지구물리탐사학회:학술대회논문집
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• 2006.06a
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• pp.271-276
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• 2006

In this paper a polarimetric airborne SAR measurement has been used to study the radar polarimetric characteristics in the intertidal area on the south coastof the Korea. The L-band NASA/JPL airborne SAR (AIRSAR) data, which were acquired on the intertidal zone during PACRIM-II Korea campaign on September 30, 2000, were used for this research. The most intertidal zones of Yeoja Bay are composed of muddy soils with high silt and clay percentage. Models of microwave scattering from rough surfaces, i.e., semi-empirical model, and Extended Bragg model, were applied to investigate the surface characteristics of intertidal zones.

• Geophysics and Geophysical Exploration
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• v.10 no.1
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• pp.19-28
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• 2007

In this study, we propose a joint inversion method, using genetic algorithms, to estimate an S-wave velocity structure for deep sedimentary layers from receiver functions and surface-wave phase velocity observed at several sites. The method takes layer continuity over a target area into consideration by assuming that each layer has uniform physical properties, especially an S-wave velocity, at all the sites in a target area in order to invert datasets acquired at different sites simultaneously. Numerical experiments with synthetic data indicate that the proposed method is effective in reducing uncertainty in deep structure parameters when modelling only surface-wave dispersion data over a limited period range. We then apply the method to receiver functions derived from earthquake records at one site and two datasets of Rayleigh-wave phase velocity obtained from microtremor array surveys performed in central Tokyo, Japan. The estimated subsurface structure is in good agreement with the results of previous seismic refraction surveys and deep borehole data. We also conclude that the proposed method can provide a more accurate and reliable model than individual inversions of either receiver function data only or surface-wave dispersion data only.