• Economic and Environmental Geology
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• v.39 no.6 s.181
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• pp.629-641
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• 2006

The Standing Buddha Statue in the Gwanchoksa temple consists of medium to coarse grained biotite granodiorite with dark grey color, and it has a week gneissosity along the pegmatite veins. The results of magnetic susceptibility and geochemical patterns of the host rock of Standing Buddha Statue and the basement rock suggest that both values are formed from the co-genetic magma with the same differentiation process. The CIAs of the basement rock and the Standing Buddha Statue are calculated to 51.43 and 50.86, and the WPIs are estimated 4.52 and 8.95, respectively. So the weathering potential from the host rock of Standing Buddha Statue and basement rock prove to be high. The Standing Buddha Statue is terribly damaged with physical weathering from deterioration and exfoliation, and are scattered with secondary pollutant and precipitate. Basement rock is also in danger of ground collapse because of irregularly developed discontinuity system. Most surface of Standing Buddha Statue is seriously discolored into yellowish brown and dark gray, or black precipitates are also formed. Moreover, it is heavily covered with crustose lichen, fungi and algae, or moss are also found. In order to control the influential factors with the complex deterioration of Standing Buddha Statue, it is needed to rearrange a site environments, and conservation scientific management is required to protect it from covering lichens, exfoliations and fractures.

• Economic and Environmental Geology
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• v.57 no.2
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• pp.243-251
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• 2024

In this study, a surface geological survey was first conducted to investigate aggregate resources in the Yeongam area of Jeollanam-do, and a drilling survey was conducted in the lower part of the surface, which was difficult to identify through a surface geological survey, to determine the spatial distribution of aggregates. Drilling sites were selected considering the topographical development and Quaternary alluvium characteristics of the study area, and river aggregate drilling surveys were conducted at a total of 5 points and land aggregate drilling surveys were conducted at a total of 28 points. Borehole core sediments were classified into seven sedimentary units to determine whether they could be used as aggregates, and optically stimulated luminescence dating was performed on representative boreholes to measure the depositional period for each sedimentary unit. As a result of the study, most of the Yeongam area had a very wide river basin, so it was estimated that there would be a large amount of aggregate, but the amount of aggregate was evaluated to be very small compared to other cities and counties. Most of the unconsolidated sedimentary layers in the Yeongam area are composed of blue-grey marine clay with a vertical thickness of more than 10 m. The sand-gravel layer corresponding to the aggregate section is distributed in the lower part of the marine clay, thinly covering the bedrock weathering zone. This is because the amount of aggregates themselves is small and most of the aggregates are distributed at a depth of 10 m below the surface, which is currently difficult to develop, so the possibility of developing aggregates is evaluated to be very low. As a result of dating, it can be seen that the blue-grey marine clay layer is an intertidal sedimentary layer formed as the sea level rose rapidly about 10,000 years ago. The deposition process continued from 10,000 years ago to the present, and as a result, a very thick clay layer was deposited. This clay layer was formed very dominantly for about 6,000 to 8,000 years, and the sand-gravel layer in the section where aggregates deposited in the Pleistocene period can exist was measured to have been deposited at about 13.0 to 19.0 ka, and about 50 ka, showing that it was deposited as paleo-fluvial deposits before the marine transgression process.

• Economic and Environmental Geology
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• v.43 no.2
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• pp.73-84
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• 2010

Gold and silver deposits within the Eunjeok and Sangeun mines are located in Yeongam district, Cheollanamdo-province. They are composed of vein ore bodies infilling the fractures of Cretaceous rhyolitic tuff. The Eunjeok mine have three gold and silver bearing hydrothermal veins which is infilling the fracture of rhyolitic tuff. Major ore minerals within the Eunjeok and Sangeun mines are arsenopyrite, pyrite, chalcopyrite, sphalerite and galena and minor ores are electrum, native silver and argentite. Sericitization is dominant in alteration zone and chloritization and dickitization is minor. Quartz veins in the Eunjeok and Sangeun mine have the similar paragenesis and vein textures such like breccia, crustiform, comb and vuggy morphology indicating the formation of typical epithermal environment. In order to carry out the preliminary feasibility study of mine according to the commodity and elucidate the occurrence features of mineral resources from Eunjeok and Sangeun mine, common commodity (Pb, Zn, Cu, Fe, Mo, W, Au and U), and industrial commodity (In, Re, Ga, Ge, Se, Te, Y, Eu and Sm) for 17 ore specimen were analyzed. It is tentatively thought that there is no exploitable mine for iron, lead, zinc, copper, tungsten and uranium based on the preliminary result. If the reserves are secured through the detailed prospecting in case of molybdenum and silver, it is tentatively thought that there will be exploitable deposits depending on international metal price. If we assume the vein width from 0.25 m to 2 m including alteration zone with the gold grade of 80g/t, it is inferred that the resources amount of the Eunjeok-Sangeun mines range from 6.5 to 65ton. However, as the vein structure of the Eunjeok and Sangeun mines is developed together with alteration zone, it should be estimated to include potential alteration zone in order to yield the average grade. It is needed to carry out more exploration in the near future because the reserves can be flexibly estimated according to the change of average grade considering the alteration zone.

• Economic and Environmental Geology
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• v.54 no.4
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• pp.441-456
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• 2021

The Cretaceous Duwon Formation was studied on the basis of sedimentologic analysis in order to unravel geologic conditions for the development of the streamflow-dominated alluvial fan under arid to semi-arid climatic conditions. The Duwon Formation unconformably overlies the Paleoproterozoic gneiss (basement). Based on the sedimentologic analysis, the Duwon Formation is interpreted to have been deposited in gravelly braided stream (FA-1) near the basement, laterally transitional to sandy braided stream (FA-2) and floodplain environments (FA-3) with distance (< 7 km) from the basement. Lateral changes in sedimentary facies and the well development of calcrete nodules in FA-3, together with radial paleocurrent directions measured in FA-1, are suggestive of the deposition of the Duwon Formation in streamflow-dominated alluvial fan under arid to semi-arid climatic conditions. Recent analysis of detrital zircon chronology suggests that sediments of the Duwon Formation were derived from the southwestern part of the Korean peninsula, including the western part of Yeongnam Massif and the southwestern part of Okcheon Belt. This implies the alluvial fan where the Duwon Formation accumulated had the large drainage basin. Because the large drainage basin can supply the significant amounts of water and temporarily store the sediments within the basin, watery floodwater carried sediments to the alluvial fan rather than the debris flows. Furthermore, the drainage basin largely composed of coarse-grained metamorphic and igneous rocks produced sand-grade sediments, preventing evolution of floodwater into debris flows. We suggest that combined effects of the large drainage basin and its coarse-grained metamorphic and igneous rocks provided favorable conditions for the development of streamflow-dominated alluvial fan, despite arid to semi-arid climatic conditions during sedimentation.

• The KIPS Transactions:PartA
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• v.8A no.3
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• pp.235-244
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• 2001

Development of network and computer technology results in many studies to use physically distributed computers as a single resource. Generally, these studies have focused on developing environments based on message passing. These environments are mainly used to solve problems for scientific computation and process in parallel suing inside parallelism of the given problems. Therefore, these environments provide high parallelism generally, while it is difficult to program and use as well as it is required to have user accounts in the distributed computers. If a given problem is divided into completely independent subproblems, more efficient environment can be provided. We can find these problems in bio-informatics, 3D animatin, graphics, and etc., so the development of new environment for these problems can be considered to be very important. Therefore, we suggest new environment called InterCom based on a proxy computing, which can solve these problems efficiently, and explain the implementation of this environment. This environment consists of agent, server, and client. Merits of this environment are easy programing, no need of user accounts in the distributed computers, and easiness by compiling distributed code automatically.

• Economic and Environmental Geology
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• v.48 no.2
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• pp.103-114
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• 2015

Jinsan gold deposit is a hydrothermal vein type deposit consisting of several fissure filling quartz veins developed within the Changri Formation of the Ogcheon Supergroup in Geumsan, Chungnam. This study is to provide an efficient exploration and development strategies based on the characteristics of the geology, geological structure, core logging, and ore vein occurrence and grade for the four pits (New pit, Main pit, Yanghapan pit and Teugho pit). Quartz veins are mostly developed with the strike of $N10^{\circ}-25^{\circ}W$ and $N5^{\circ}-20^{\circ}E$, and the thickness is in the range of 0.1~0.5 m, sometimes extending to over 1m. Although the quartz veins commonly form massive shape, they sometimes show zonal structure, comb structure as well as brecciated texture. Major ore minerals are pyrite and chalcopyrite, and pyrrhotite, sphalerite, galena, marcasite, electrum and chalcocite are also accompanied as minor phases. Gray and milky white quartz veins, which are occasionally crosscut by calcite vein, also include fluorite. Ore evaluations for the 22 samples revealed that the samples from the pits generally have very low Au contents, lower than 1 g/t, but some clay samples of drilled core show very high Au concentrations, up to 141 g/t, indicating that Au content is much higher within fault gouges rather than within fresh quartz veins. This may represent that gold might have been reworked and reprecipitated by hydrothermal fluids in association with reactivation of the faults, and thus suggest that ore occurrence in this deposit is very complex and irregular and therefore more precise and systematic exploration is required.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.200-200
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• 2017

강우에 의한 토양 침식 및 토사유츨량은 하천 및 유역환경관리 관점에서 가장 중요한 인자 중 하나로 보고되고 있으며, 다양한 분야에서 이에 대한 연구를 수행 중에 있다. 일반적으로 유역에서 발생한 토양침식 및 물의 이동에 의한 토사유출량을 해석하기 위해 SWAT 등과 같은 많은 모형이 적용되고 있지만, 대부분 농업지역에서 이용하는 수평형태의 수문학적 개념에 따른 overland flow 개념을 이용하고 있다. 하지만, 우리나라는 약 70% 이상이 산림으로 이루어진 지역으로 유역환경 해석에 있어 수평적인 개념과 함께 사면내에서 lateral flow와 같은 지표하 흐름의 이동에 관한 개념 역시 필요하지만, 이의 영향에 대한 관련 연구는 부족하다. 최근 수문학의 발달과 더불어 수평적인 개념을 탈피한 사면수문학 개념이 전 세계적으로 발달하고 있으며, 많은 발전을 이루고 있다. 이를 통해 GIS를 기반으로 물리학기반의 GeoWEPP 모형이 미국을 중심으로 개발되었고, 이에 대한 많은 적용 및 평가가 이루어지고 있다. 본 연구에서는 전 세계적으로 평가받고 있는 process 기반의 SWAT 모형과 사면수문학 개념을 반영한 물리학기반의 GeoWEPP 모형을 이용하였다. 이 두 모형은 강우, 지형, 토양도, 토지피 복도 등 두 모형의 입력자료 역시 거의 동일하게 구성되어 있으며, 같은 FORTRAN CODE 및 ArcGIS에서 운영될 수 있도록 이루어져 있어 비교 분석하기 원활하다. 모형의 적용은 매년 심각한 조류가 발생하는 대청호 지류인 소옥천 유역내 중하류에 위치한 옥각교에서 관측된 모니터링 자료(토사유출량과 유출량)를 이용하여 모형의 정확성을 평가 후, 사면수문학 개념의 적용성에 대해 논하였다. 각각의 모형의 결과에 대한 정확성 평가는, Nash-Sutcliffee를 이용하여 실시하였다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.606-608
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• 1998

컴퓨터 통신의 발달로 인하여 정부기관, 학교, 연구소, 기업체등의 사회의 모든 분야에 걸쳐 인터넷 환경이 널리 보급되고 있다. 이를 통하여 컴퓨터간의 단순한 정보와 자원의 공유에 국한되었던 범위를 넘어 점자 결제, 전자 상거래, 상용 서비스 등 많은 편리함이 제공되고 있다. 그러나 최근 들어 이러한 인터넷을 이용한 불법 침입자들의 정보 유출이나 파괴 혹은 금융사고와 같은 범죄가 더욱 많아지고 지능화 되고 있다. 이러한 문제점을 보안 하기위해 불법적인 침입자들이 네트워크를 통해 시스템에 접근하여 중요한 정보를 유출 혹은 파괴하는 행위를 감시할 수 있는 시스템이 필요하게 되었다. 본 논문에서는 이러한 목적을 위해 사용하는 네트워크 모니터링 혹은 칩입 탐지를 위한 도구를 제안하고 기술할 것이다. 이 도구는 현존하는 도구들이 톡정 패킷만을 모니터링할 수 있는 문제점을 강력한 명세언어를 사용하여서 응용프로그램에서 사용하는 패킷까지도 포획할 수 있는 기능을 제공한다.

• Information and Communications Magazine
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• v.26 no.1
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• pp.11-15
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• 2009

지난 2008. 2월 정부조직 개편에 따라 방송통신위원회가 출범함으로써 디지털 융합환경에 능동적으로 대응할 수 있는 제도적 기반이 마련되었다. 신설된 방송통신위원회는 공공성과 산업성을 조화시켜 "품격있고 활기찬 커뮤니케이션 일류국가"를 구현하는 것을 비전으로 삼고 있다. 2009년에는 전반적인 경기침체 속에 방송통신 서비스 및 기기 분야도 예년에 비해 저성장이 예상되고 있어, 경제 살리기 차원에서 고용효과가 높고 경제적 파급효과가 큰 방송통신 서비스를 집중 육성할 계획이다. 우선 IPTV의 조기 산업화를 위해 네트워크 및 콘텐츠 투자확대, 공공분야 시범사업, 기술개발 등을 집중 추진하고 방송의 디지털전환에 대한 국민적 인지도를 획기적으로 향상 시키려고 한다. 나아가 수평적 규제체계로 나아가는 통합 사업법 준비에 본격 착수하고 다매체 다채널 시대에 적합한 방송통신 콘텐츠 활성화에도 노력을 경주할 것이다. 방송분야에서는 세계적 추세에 맞춘 규제 개혁이, 통신분야에서는 본원적 설비투자에 대한 투자활성화 유도가 핵심이다. 아울러 소중한 전파자원의 효율적 이용을 강화하고 방송통신망의 고도화도 계속 추진할 것이다. 끝으로 기술 발달과 산업 성장이 궁극적으로 이용자 복지 증진에 기여하도록 세심한 주의를 기울일 계획이다. 우리는 방송통신 융합 활성화에 유리한 물적 인프라와 인적 특성을 보유하고 있어 민관이 공동으로 노력한다면 다가오는 시대에도 방송통신 강국의 지위를 유지할 수 있을 것이다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.155-158
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• 2017

최근, 국내 방송시스템은 외부 방송 콘텐츠와 사내 멀티미디어 콘텐츠를 효율적으로 관리 및 전송하기 위해서 파일기반 으로 시스템을 운용하고 관리한다. IT기술이 발달함에 따라 생활의 편리성과 실용성을 도모하기 위해 많은 멀티미디어 콘텐츠와 통신기술이 개발 되었고, 모든 분야에서 통신 기술과 멀티미디어 콘텐츠를 통해서 정보화 사회의 핵심 자원인 정보를 서로 공유하고 전달함으로써 많은 사람들이 정보를 빠르고 정확하게 습득 할 수 있게 되었다. 이러한 다양한 방송기술들을 효율적으로 운용하기 위해 파일기반 방송시스템을 설계하여 효율적으로 콘텐츠를 실시간으로 제작 및 운용할 수 있는 환경을 조성하고 방송의 안정성을 확보하였다.