• 제목/요약/키워드: Geophysical exploration

검색결과 1,216건 처리시간 0.028초

CONTENT-BASED IMAGE RETRIEVAL TECHNIQUES

  • KulwinderSingh;MingMa;DongWonPark
    • 지구물리
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    • 제4권3호
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    • pp.183-195
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    • 2001
  • This paper contains and facts to a number of projects on "content-based access to image databases" around the world today. The main focus is on what kind of image features are used but also the user interface and the users possibility to interact with the system.

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무극광산(無極鑛山)의 탐사(探査)와 개발현황(開發現況) (Exploration and Development of the Muguk Au Mine)

  • 신양우;서규식
    • 자원환경지질
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    • 제20권4호
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    • pp.261-271
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    • 1987
  • Muguk gold deposits are composed of quartz veins emplaced along faults in Mesozoic granodiorite. General strikes and dips of the veins are $N15{\sim}20^{\circ}W$ and $70{\sim}80^{\circ}NE$. Associated ore minerals are pyrite, arsenopyrite, sphalerite, galena, chalcopyrite, pyrrhotite, native silver, argentite, tetrahedrite and electrum. Vein mineral paragenesis is complicated by repeated fracturing, but five distinct depositional stages can be recognized. Electrum grains are associated mainly with sulfide bands formed along both margins of pale pink quartz of stage 3, and with patches of pyrite aggregate of stage 4. Before the close down in 1972, Muguk gold mine yielded more than 8 tons of gold of which major portion was produced from the No.2 vein. No.2 vein, extending about 1,500m laterally, was exploited to a depth of about 750m. In 1984, Young-poong mining company acquired the mining property and began geologic mapping, geochemical and geophysical exploration, diamond drilling and exploration tunnelling around the mine area to seek for other rich gold-bearing quartz veins. As the Samhyungje vein was disclosed to be the most rich vein, exploration works were focussed on the Samhyungje vein. As of August 1987, 22,338m of diamond drilling and 9,652m of exploration tunnelling have been undertaken. Owing to the successful result of exploration, the Muguk mine commenced normal operation on January 1987, treating 5,500 tons of ore per month.

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An integrated studies for salt-water intrusion in Yeonggwang-gun, Korea

  • Hwang Seho;Chi Sejung;Lee Won-suk;Shin Jehyun;Park Inhwa;Huh Dae-Gee;Lee Sang-kyu
    • 한국지구물리탐사학회:학술대회논문집
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    • 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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    • pp.455-458
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    • 2003
  • A combination of drilling, hydrogeochemical survey, geophysical survey and the numerical modelling for the flow and transport of groundwater was performed to evaluate the seawater intrusion in Baeksu-eup, Yeonggwang-gun, Korea. The survey area extends to over 24 $km^2$. Twelve wells were also drilled for the collection of geologic, geochemical, hydrologic, and geophysical logging data to delineate the degree and vertical extent of seawater intrusion. To evaluate and map the salinity in a coastal aquifer, geophysical data and hydrogeochemical results were used. Layer parameters derived from VES data, various in situ physical properties from geophysical well loggings, and the estimated equivalent NaCl concentration were used as the useful input parameters for the numerical simulation with density-dependent flow. Our multidisciplinary approach for evaluating the seawater intrusion can be considered as a valuable attempt to enhancing the utilization of various data and the reliability of numerical ground modelling.

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국내 유도분극 탐사의 연구동향 (Research Trends in Induced Polarization Exploration in Korea)

  • 박삼규
    • 지구물리와물리탐사
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    • 제24권4호
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    • pp.202-208
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    • 2021
  • 유도분극(Induced Polarization, IP)탐사가 1973년에 국내 학술지에 처음 소개되었으며, 그 이후 석탄 및 금속광상탐사에 응용되기 시작하면서 대학 및 연구기관에서 유한요소법에 의한 IP 모델링 연구와 인공모형 시료의 유도분극반응 측정 기술이 개발되었다. 1980년 중반에 광대역유도분극(SIP) 탐사기가 국내에 도입되면서 실내 측정 및 해석 기술이 개발되었으나 자원산업의 쇠퇴와 더불어 광상탐사 현장에서 널리 활용되지는 못했다. 1990년대에는 IP탐사가 황화광물의 열수광상 및 벤토나이트 광화대 조사와 해수 침입에 의한 지하수 오염지역에 적용된 사례가 있다. 2000년대 들어서면서 IP탐사의 3차원 역해석 기술이 개발되고, 국내외 광물자원확보를 위한 정밀물리탐사 기술이 요구되면서 암석 시료의 SIP 측정 및 현장 탐사 기술이 확보되었으며, 해남지역 금은광상의 광화대 탐사에 적용한 결과 SIP탐사 기술이 황화광물을 포함하고 있는 금속광상탐사에 유용함이 입증되었다. 이러한 IP 탐사는 리튬, 코발트, 니켈과 같은 첨단 산업의 핵심광물 탐사에서 효과적일 것으로 여겨지고, 또한 환경오염과 지반조사 분야에서도 유용할 것으로 기대된다.