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오석훈,이무형 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.6
Congenital giant melanocytic nevi (CGMN) are lesions of more than 20 ㎝ in diameter, often in the distribution of a garment. Depigmented zones may appear around several types of acquired lesions such as dermal, junctional, and compourd nevi, Spitz nevus, blue nevus, and malignant melanoma. The depigmentation may occur within the lesion, around it, or at a distant site. In contrast, congenital nevi rarely develop depigmentation. Vitiligo-like leukoderma distant from the nevus has developed in only three cases with a CGMN. We report two cases of CGMN with vitiligo which is located away from primary CGMN lesion. (Korean J Dermatol 2003;41(6) : 805~808)
오석훈 한국자원공학회 2008 한국자원공학회지 Vol.45 No.6
Geostatistical inverse approach using geophysical data was applied to indirectly make the RMR classification at points apart from boreholes. The geostatistical approach was usually used to find optimized estimation which supports two or more different physical properties at unsampled points. However, in this study, an approach to solve inverse problem was proposed. The primary variable, RMR values obtained at known boreholes, is geostatistically simulated with many realization at pre-defined grid point according to the variogram model. The simulated values are sequentially compared with the physical property resulted from geophysical survey at an arbitrary grid point, and the most similar one is chosen. This process means that the spatial distribution of primary variable, RMR, is conformed well to the original pattern of the borehole observation, and ensure to fit the geophysical survey result to reflect the correlation between different physical properties.
오석훈,박현호,이정덕,김낙인 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.8
Cutaneous cholesterol embolism is a disease due to the embolism of cholesterol crystals from ulcerated atheromatous plaques to peripheral vessels of the skin. It has been associated with major vessel surgery, angiography, angioplasty, intra-aortic balloon pump placement, anticoagulation, thrombolytic therapy and cardiopulmonary resuscitation. In addition, it may occur spontaneously. In paraffin-fixed sections, the cholesterol crystals are dissolved and leave needle-like clefts within the lumina of arterioles. We report a case of cutaneous cholesterol embolism in a 72-year-old woman who had purplish gangrenous lesions on both her feet after coronary angiography and percutaneous transluminal coronary angioplasty. (Korean J Dermatol 2003;41(8) : l121~l123)
오석훈 한국지질과학협의회 2012 Geosciences Journal Vol.16 No.1
Some microearthquakes that occur in the Korean Peninsula show significant geomagnetic variation when subjected to a specialized principal component analysis, wavelet-based semblance filtering and eigenvalue analysis. In this study, the principal component analysis was used to reconstruct and predict the geomagnetic field based on the past observed magnetic fields, and the reconstructed field was compared with the field observed during the earthquake event. The wavelet-based filtering showed improved results in delineating the earthquake event’s geomagnetic variations from their background field. Finally, the change in the tendency of the eigenvalues was detected by the analysis of three components of the geomagnetic fields during the earthquake event. The basement rock of the Korean Peninsula is known to have a highly resistive electrical structure that makes it possible for small-magnitude earthquakes to generate exaggerated geomagnetic variations. This is the first study reporting the relation between these earthquake events and the geomagnetic variations observed in the Korean Peninsula.
Bayesian Inversion for Cavity Investigation
오석훈,서백수 한국자원공학회 2010 Geosystem engineering Vol.13 No.3
Geophysical investigation and Bayesian inversion have been performed to investigate the cavity structure. The targeted cavity is a lava cave in Cheju Island, Korea and the geometry of the cavity is already known. For the cavity detection, we have used the both dipole-dipole array resistivity and gravity method. Although the two methods generally have different objectives, common characteristics may be appeared in the cavity structure. That is, the resistivity value is high but the gravity one is low in the presence of the cavity. We choose the dipole-dipole array resistivity data as prior information for the Bayesian inversion of gravity data. We applied the indicator variogram modeling to transform the result of resistivity inversion to density information, as higher resistivity block has lower density one. This assumption is valid in Cheju Island where most of the rocks are composed of basalt. Generally, cavity investigation by single geophysical exploration is difficult to get effective result. However, this coupled interpretation proposes a new way to provide remarkable improvement and stability when compared to the result of single method.
3차원 전기비저항 모델링을 통한 제체의 안정성 분석 연구
오석훈 한국지구과학회 2008 한국지구과학회지 Vol.29 No.6
Recently, the electrical DC survey has frequently been performed to assess the safety of embankment. This study showed that the damaged section of embankment could be appropriately detected by the survey only when the three dimensional effect was correctly considered. The shape of the three dimensional embankment was numerically implemented, and a proper modeling was performed to confirm the effect by analyzing the apparent and inverted true resistivity. Then, the field work was carried out. The three dimensional interpretation distinguished the erroneous weak zones from the geometrical artifact, and the embankment was ensured as safe both by the additional survey performed in rainy season and the partial excavation for direct observation. 최근 제체 등의 수자원시설물에 대한 안정성 검토를 위해 전기비저항 탐사가 많이 수행되고 있다. 본 연구에서는 전기비저항 조사를 통해 제체의 안정성을 검토하고자할 때, 제체의 3차원 형상에 의한 효과를 정확히 분석하여야만 손상 구간을 파악할 수 있음을 제시하고자 한다. 이의 검토를 위해 3차원 전기비저항 모델링을 통해 3차원 형태의 제체 모양을 수치모델로 구현하고, 제체 내부의 상태에 따른 겉보기 비저항과 역산 결과를 분석하였다. 또한 실제 3차원 곡면 형태를 가진 제체에서 전기비저항 탐사를 수행하여 그 결과를 분석하였다. 그 결과, 단순히 2차원으로 해석하였을 때 이상대로 추정되었던 구간이, 실제로는 3차원 곡면에 의한 기하학적 효과였음이 밝혀졌으며, 3개월 뒤에 수행된 우기의 추가 조사와 추후 일부 굴착을 통하여 제체의 내부가 안전한 상태임을 확인하였다.