• 한국지구물리탐사학회:학술대회논문집
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• 2005.05a
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• pp.79-86
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• 2005

The apparent source spectrum of the Fukuoka earthquake is estimated at the seismic basement by removing from the observed spectra at Korean seismic stations the path and site responses that were previously revealed through inversion process applied to large spectral D/B accumulated until 2004. The approximate source spectrum is also estimated by using data recorded near the epicenter from various Japanese seismic networks and compared with the Korean source spectrum. The comparison result shows that there is good agreement among source spectra estimated based on the data from seismic networks of Korea at large distances (190km

• Journal of the Korean Geophysical Society
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• v.8 no.1
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• pp.15-21
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• 2005

The apparent source spectrum of the Fukuoka earthquake is estimated at the seismic basement by removing from the observed spectra at Korean seismic stations the path and site responses that were previously revealed through inversion process applied to large spectral D/B accumulated until 2004. The approximate source spectrum is also estimated by using data recorded near the epicenter from various Japanese seismic networks and compared with the Korean source spectrum. The comparison result shows that there is good agreement among source spectra estimated based on the data from seismic networks of Korea at large distances (190 km

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.355-355
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• 2022

기후변화에 의한 이상가뭄 발생 등을 대비하기 위한 비상용수 또는 대체수자원으로서의 지하수 개발수요가 증가하는 추세에 따라 기저유량 확보 및 수질 개선 방안을 수립하는 것은 지속가능한 수자원 이용·관리 측면에 있어서 매우 중요하다. 지하수 및 기저유량 확보 및 수질 개선을 위해서는 지표-지하수 통합 관리가 필요하며 이를 기반으로 지하수 및 기저유량 변동에 대한 인과관계 파악 및 구체적인 조사가 필요하다. 따라서 본 연구에서는 지표-지하수에 대한 계절적·시공간적 변동성을 잘 모의할 수 있는 통합 모델을 기반으로 지하수위 변동을 포함한 물수지 분석과 장·단기 유출해석이 정량적으로 분석하고자 하였으며, 평창군 대화면, 만대지구, 신둔천 유역을 대상으로 간벌, BMP, LID를 비롯한 다양한 시나리오에 따른 기저유량 및 수질변화 그리고 오염특성 파악을 수행하였다. 본 연구에서는 지표-지하수 통합 모델링을 위하여 SWAT-MODFLOW 모형을 활용하였으며, 간벌 시나리오의 경우 모형 Source code를 수정하여 간벌의 효과를 모의할 수 있도록 수정하였다. 또한 BMP와 LID의 경우 각 HRU별로 저감시설에 대한 효율 및 매개변수 조정을 통해 효율을 모의하였다. 모형의 입력자료 구축을 위하여 지표 모형의 경우 DEM, 토지이용도, 토양도를 활용하였으며, 지하수 모형의 경우 지하수기초조사자료에 수록된 수리전도도, 비산출율, 비보유율 조사결과를 활용하여 입력자료를 구축하였다. 그 결과 간벌시나리오의 경우 건기시 최소 6.7% 이상의 하천유량, 22.56% 이상의 기저유량, 그리고 0.3 m 이상의 지하수위 확보가 가능한 것으로 나타났다. BMP의 경우 유역면적의 약 7%에 BMP가 설치된 것으로 나타났으며, 이에 따른 하천 말단 SS저감효율은 6.7%로 나타났으나 유량에서는 큰 차이를 나타내지 못하였다. 마지막으로 LID시나리오의 경우 적용 소유역의 강우시 평균유량이 약 29% 감소하였으며 건기시 평균 기저유량이 약 44%이상, 평균 BFI는 약 0.13 증가한 것으로 나타났다.

• Journal of the Korean Geophysical Society
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• v.9 no.4
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• pp.417-426
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• 2006

Geophysical survey has been conducted on the continental margin off the South Shetland Islands aboard R/V Onnuri of KORDI in 1992/1993. About 800-line km of 96-channel reflection data have been acquired. On the seismic section, BSR with strong reflectivity and negative polarity has been found at 700 ms below the sea bottom. BSR is considered as the base of gas hydrates and AVO analysis was performed to study physical properties along BSR. True amplitude recovery and surface consistence amplitude were applied to seismic data and angle gathers were obtained. AVO gradient and AVO intercept are calculated on every CDP gather. Section of AVO intercept show strong reflectivity and negative polarity on BSRs and stronger continuity of BSR than stacked section. Cross plot of P-G indicates that the lower layer below BSR is filled with free gas.

• The korean journal of orthodontics
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• v.41 no.4
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• pp.224-236
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• 2011

Objective: The purpose of this study was to analyze the dental and basal arch forms in patients with normal occlusion using the computed tomography (CT) imaging method. Methods: CT images were taken from 27 normal occlusion subjects (male, 15; female, 12) and these images were reconstructed into three-dimensional models. A 3D-coordinate system was formed by setting the middle of the facial axis (FA) point of the maxillary central incisors as the origin. The morphology of the maxilla and mandibular dental and basal arches were analyzed by sectioning parallel to the maxillary occlusal plane. Results: There was no significant difference between A point and B point and between the maxillary 1st molars in both sides of the maxillary and mandibular basal bone. The dental arch was located more labially than the basal arch in the anterior portion. The bucco-lingual crossover of the dental arch and basal arch was formed at the molar region in the maxilla, and at the premolar region in the mandible. Conclusions: This study will help provide three-dimensional diagnostic information about the relationship between basal and dental arches in patients who have severe dental compensation and inappropriate jaw relationships.

• Journal of the Korean Vacuum Society
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• v.20 no.5
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• pp.356-360
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• 2011

Indium oxide ($In_2O_3$) single layer and $In_2O_3$/copper (Cu) bi-layer films were prepared on glass substrates by RF and DC magnetron sputtering without intentional substrate heating. In order to determine the effect of the Cu bottom layer on the optical, electrical and structural properties of $In_2O_3$ films, 3-nm-thick Cu film was deposited on the glass substrate prior to deposition of the $In_2O_3$ films. As-deposited $In_2O_3$ films had an optical transmittance of 79% in the visible wavelength region and a sheet resistance of 2,300 ${\Omega}/{\square}$, while the $In_2O_3$/Cu film had optical and electrical properties that were influenced by the Cu bottom layer. $In_2O_3$/Cu films had a lower sheet resistance of 110 ${\Omega}/{\square}$ and an optical transmittance of 71%. Based on the figure of merit, it can be concluded that the Cu bottom layer effectively increases the performance of $In_2O_3$ films for use as transparent conducting oxides in flexible display applications.

• Journal of Korea Water Resources Association
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• v.48 no.4
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• pp.309-319
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• 2015

River characteristics in South Korea has been affected by seasonal climatic variability due to climate change and by remarkable land cover change due to rapid economic growth. In this regard, the roles of river management is getting more important to eco-system and human community in watersheds of South Korea. Understanding river characteristics including direct runoff and baseflow, the first step of river management, can give a significant contribution to sustainable river environment. Therefore, the objective of this study is to quantify the contributions of the direct runoff and baseflow to river streamflow. For this, we used the BFLOW and WHAT programs to conduct baseflow separation for 71 streamflow gauge stations in Han River system, South Korea. The results showed that baseflow index for 71 stations ranges from 0.42 to 0.78. Also, gauge stations which have baseflow index more than 0.5 occupied 76% of a total stations. However, baseflow index can be overestimated due to human impacts such as discharge from dams, reservoirs, and lakes. This study will be used as fundamental information to understand river characteristics in river management at the national level.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.375-375
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• 2011

유역에서 강우에 따라 유출이 발생하면 지표면을 따라 하천으로 유입되거나, 땅속으로 침투하여 깊은 대수층으로 유입되던지 기저유출 형태로 하천으로 유입된다. 이렇듯 하천을 구성하는 중요 두 가지 요소인 직접유출량과 기저유출량을 정확히 산정하는 것이 유역 수자원관리 및 비점오염원 관리에 매우 중요한 부분이라 할 수 있다. 그동안 하천에서 측정된 유출량에서 직접유출과 기저유출을 분리하기 위한 많은 연구가 진행되어 왔으며, 최근에는 주관적인 면을 배제하고 장기실측 유량자료를 이용하여 기저유출을 분리할 수 있는 BFlow, HYSEP, PART, RORA, RECESS, 디지털 필터링 모형 등 많은 프로그램들이 개발되어 활용되어 오고 있다. 또한 최근에는 인터넷을 통해 활용할 수 있는 Web 기반 WHAT 프로그램이 개발되어 전 세계적으로 널리 활용되고 있다. 이에 본 연구에서는 XML 프로그래밍 기법을 이용하여 WHAT 프로그램을 확장한 Expaned XML-based WHAT (EX-WHAT) 시스템 (http://www.EnvSys.co.kr/~exwhat)을 개발 하였다. 기존의 시스템에서는 USGS 일유량자료를 URL을 통해 WHAT 서버에 저장한 후 이를 가공하여 수문 분석을 수행하였으나, 이번 연구를 통해서 개발된 시스템은 XML/Parser를 이용하여 USGS 서버에 저장되어 있는 일유량자료를 바로 읽어서 수문분석을 수행할 수 있게 되었다. 이 EXWHAT 시스템에는 BFlow, HYSEP, PART, Digital Filters 와 같은 엔진이 사용되고 있다. 본 연구에서 개발된 EX-WHAT 분석결과는 XML 형식으로 제공되고 있기 때문에, 다른 Web/Desktop 기반의 관련 프로그램에서 바로 활용될 수 있을 것이라 판단된다. 특히 EX-WHAT 분석결과는 유역관리, 기저유출을 통한 비점오염원 관리 평가, 지속가능한 지하수 고나리 등 다양한 수문/비점오염 연구/실무에 활용될 수 있을 것이라 판단된다.

• Applied Microscopy
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• v.35 no.3
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• pp.177-186
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• 2005

The foregut epithelium of the last instar larva in the scarab beetle, Allomyrina dichotoma was observed with electron microscopes. The foregut epithelium of the scarab beetle larva is composed of a single-layered squamous absorptive cell. The luminal surface of the epithelium is covered with cuticular intima. The free surface of the squamous cell has a irregular array of microvilli 'brush border', while cell membrans close to the basal lamina are infolded and a lot of mitochondria are concentrated in those processes. The cytoplasm in the epithelial cells is well developed nucleus, mitochondria. And the basal region of cell contains large lipid-, protein droplets and numerous glycogen granules. The basal lamina is located between the basal membrane and muscle bundle, providing barrier between the epithelium and the hemolymph. The epithelium is surround by the subepithelial space and muscles. The subepithelial space, which is composed of fibrous connective tissue is innervated by many tracheoles and axon.

• Tuberculosis and Respiratory Diseases
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• v.54 no.2
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• pp.191-198
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• 2003

Background : The pathological features in asthmatic airway remodeling are diverse. The aim of this study was to examine the degree of airway vascularity in relation to the other remodeling parameters in asthmatics. Methods : Bronchial biopsies were done in 34 asthmatic patients, and 6 control subjects. The basement membrane thickness and the subepithelial thickness were measured in the hematoxylin-eosin stained tissue, and the degree of vascularity was measured using type IV collagen immunostaining. Results : 1) Compared to the control subjects, the asthmatics showed a significant increase in the basement membrane thickness ($6.92{\pm}2.01{\mu}m$ vs $9.67{\pm}2.84{\mu}m$, p<0.05) and the subepithelial thickness ($44.49{\pm}31.92{\mu}m$ vs $121.22{\pm}72.79{\mu}m$, p<0.05). 2) Compared to the control subjects, the asthmatics showed a significant increase in the vascular area per unit submucosal area ($4.51{\pm}2.13%$ vs $10.32{\pm}6.08%$, p<0.05). In addition, the number of vessels per unit submucosal area showed an increased tendency without statistical significance. 3) In the asthmatics, the number of vessels and the vascular area per unit submucosal area showed no correlation with the basement membrane thickness, the subepithelial thickness, the severity, the forced expiratory volume in 1 second($FEV_1$), and the methacholine provocative concentration 20($PC_{20}$). Conclusion : This study showed that vascularity was an important parameter in asthmatic airway remodeling but it was not related to the other remodeling parameters such as the basement membrane thickness and the subepithelial thickness. Each of these asthmatic remodeling parameters may have a different clinical significance. Therefore, further studies will be needed.