http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 이현석 (검색결과 1,394 건)
- 무료
- 기관 내 무료
- 유료
-
석탄광 폐석적치장에서의 산성 암석 배수 발생 평가 연구
이현석,고주인,지상우,김선준,정영욱 한국자원공학회 2006 한국자원공학회지 Vol.43 No.5
Waste rock dumps of two abandoned mines(the S-J and the D-W) and also of an operating mine (the K-S mine) were analyzed with the objective of assessing Acid Rock Drainage (ARD) in terms of seepage and its characteristics. In the study, it was also attempted to see whether the seepage has potential health hazard. The results of the study to ARD generation assessment in the abandoned mine case show that Net Acid Producing Potential (NAPP) of the S-J mine can be as high as 180.24 ㎏ H2SO4/t equivalent of acidity. NAPP of the D-W mine was measured having acidity of 20.99 ㎏ H2SO4/t. The case of K-S mine currently being operated was compared with the two study areas of the S-J and the D-W mines. NAPP of the K-S mine appeared low with 11.47 ㎏ H2SO4/t but was confirmed that the ARD generation potential exists. In the results of seepage analysis, pH data ranged from 2.18 to 3.31 and high concentrations of Fe, Al, Mn, SO4-2 in the S-J mine and the D-W mine of waste rock dump were found out. This result shows that the water resources surrounding waste rock dumps are likely to be affected by this seepage posing health hazards. The pH of seepage (4.33~4.56) in K-S mine waste rock dump was high compared to other two study areas. But concentrations of Al, Mn, and SO42- appeared about 20, 40, and 2500 mg/l respectively. Therefore, it was concluded that waste rock dump of K-S mine drainage without treatment can generate significant pollution. A comprehensive environmental management plan is also necessary to control the problems of drainage. 폐광된 광산의 폐석적치장과 가행중인 광산의 폐석적치장을 대상으로 폐석의 산 발생 특성 및 침출수의 특성을 분석하여 폐광 후에 진행될 수 있는 광해 발생을 예측해 보았다. 폐석의 산 발생 평가 결과 이미 폐광된 S광산 J광업소의 경우 최대 순 산 발생 능력(NAPP)이 180.24 ㎏ H2SO4/t 로 높게 나타났으며, D-W광산의 경우도 마찬가지로 최대 순 산 발생 능력이 20.99㎏ H2SO4/t 로 높게 조사되었다. 현재 가행중인 K광산 S광업소는 두 연구지역에 비해 최대 순 산 발생능력이 11.47 ㎏ H2SO4/t 로 낮게 조사되었지만 ARD 발생 암석이 존재하는 것으로 나타났다. 침출수 조사 결과 S광산 J광업소와 D-W광산의 폐석적치장에서는 pH가 2.18~3.31의 범위를 갖고, 고농도의 Fe, Al, Mn 및 SO42-함량을 보이는 침출수가 하부로 유출되고 있었으며, 이로 인하여 주변수계에서 적화현상(Yellowboy)을 확인할 수 있었다. K광산 S광업소의 폐석적치장 하부에서도 pH가 4.33~4.56으로 다른 두 연구지역에 비해 높긴 하나, Al, Mn 및 SO42-의 농도가 각각 약 20, 40, 2500mg/l로 오염된 침출수가 유출되고 있다. 따라서 K광산 S광업소의 폐석적치장을 현 상태로 조치 없이 방치한다면 폐광 후 지속적인 침출수의 유출에 의한 환경오염문제가 유발될 우려가 있다. K광산 S광업소를 비롯한 가행중인 대형 탄광들에 대해서 가행단계에서부터 폐석적치장으로부터의 산성배수의 발생에 대한 예측을 수행한다면, 적절한 관리방안을 마련함으로서 폐광 후 발생할 수 있는 산성침출수에 의한 광해에 대해 대비 할 수 있을 것이다.2006년 8월 10일 접수, 2006년 9월 19일 채택1) 한국지질자원연구원 지질환경재해연구부2) 한양대학교 지구환경시스템공학과*Corresponding Author(이현석)E-mail; kamuixc@hanmail.netE-mail; Korea Institute of Geoscinece and Mineral Resources 30, Gajeong-dong, Yuseong-gu, Daejeon 305-350, Korea
-
이현석,백대승,주호종,김준환,홍연정,박진호,조호성,박철 한국임상수의학회 2012 한국임상수의학회지 Vol.29 No.6
A 5-year-old, intact female, Pomeranian was presented with a persistent vomiting for 5 days after swallowing a chicken bone. The dog was diagnosed with an esophageal foreign body, and a small perforation was found after the endoscopic removal of the chicken bone. The dog was determined to be treated with a non-operative management,and a complete closure of the perforation was confirmed by a flexible endoscopy 3 weeks after removal of a chicken bone. This paper reports the case of esophageal perforation caused by foreign body in esophagus managed with the non-operative therapy instead of surgical correction.
-
-
-
-
-
-
-
이현석,손정희,송기훈,오주현,김윤섭,황인걸,김세현,곽원준 한국지질과학협의회 2025 Geosciences Journal Vol.29 No.1
Biostratigraphic research has been conducted over the last four decades in the southwestern Ulleung Basin and has provided a chronostratigraphic framework to understand basin evolution. However, absolute geologic ages for the basin are almost absent owing to the lack of deep-drilled cores. To obtain the absolute age from the zircon, we extensively sampled and measured five deep-drilled conventional cores previously obtained for hydrocarbon exploration from the southwestern shelf of the Ulleung Basin. Maximum Depositional Ages (MDAs) for each cored interval are determined by the youngest age groups of zircons and are calculated to 12.1 ± 0.1 Ma for Gorae I-1, 12.9 ± 0.2 for Gorae I-2, 10.2 ± 0.8 for Gorae V-3, 11.4 ± 0.7 for Gorae V-4, and 16.9 ± 0.3 for Dolgorae V-1. All age groups exhibited relatively narrow errors (avg. ± 0.4 Ma), indicating good accuracy of MDA. The MDAs for the cores were first obtained by Laser Ablation-Multi Collector-Inductively Coupled Plasma Mass Spectrometry (LA-MC-ICPMS), and the youngest zircon grains were subsequently reanalyzed by Sensitive High-Resolution Ion Microprobe (SHRIMP) to prevent age underestimation due to possible Pb loss. The differences in absolute ages of Gorae I-1 and I-2 between LA-MC-ICPMS and SHRIMP methods are below than 0.8 Ma, indicating good verification of MDAs. The four seismic horizons that overlapped with the cored interval were newly established as GR I-2 MDA, GR I-1 MDA, GR V-4 MDA, and GR V-3 MDA (except for Dolgorae V-1 because of the poor quality of the seismic profiles). The newly defined MDA horizons were compared to the biostratigraphic sequence boundaries of (Yi et al., Marine and Petroleum Geology 122, 2020), indicating ages 1 to 3 Ma younger than the biostratigraphic estimates. The four MDA horizons provide a new time framework for sequence stratigraphic interpretation of the Miocene deposits as well as reconstruction of the basin-evolution model in the southwestern shelf of the Ulleung Basin.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
