• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.433-436
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• 2005

국내 A군에서 운영중인 한 쓰레기 매립지에서 배출되는 침출수와 주변 지하수를 채취하여 화학분석과 동위원소 분석을 실시하였다. 그리고 생활 쓰레기가 분해되는 과정에서 생성되는 가스들을 채집하여 동위원소 분석을 실시하였다. 유기물 분해로 생성된 이산화탄소는 일차적으로 침출수의 알칼리도를 높이고 이차적으로 일어나는 이산화탄소의 환원작용에 의하여 메탄가스가 형성되었다. 이러한 과정에서 침출수내의 용존무기탄소(DIC)의 탄소 동위원소 조성이 부화되었으며, 아울러 생성된 메탄과의 수소 동위원소 교환반응에 의하여 침출수의 수소 동위원소 조성이 크게 부화되는 특징이 관찰 되었다. 쓰레기장에서 발생되는 혼합가스에서 이산화탄소를 분리하여 탄소 동위원소 조성을 분석해 본 결과 새로운 매립지 보다 오래된 매립지에서 배출되는 이산화탄소의 탄소 동위원소 조성이 부화되는 특징이 관찰되었다.

• Journal of the Korean earth science society
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• v.43 no.1
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• pp.165-175
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• 2022

Earthquakes have occurred owing to movements on a fault since several billion years ago. Research on the relationship between earthquakes and groundwater began in the 1960s in the United States, but related works, including hydrogeochemistry research, only began in the 2010s in South Korea. In this study, domestic studies on the relationship between earthquakes and groundwater until 2021 were collected from the Web of Science and characterized by subject area (groundwater level, hydrogeochemistry, combination of the two, and others). The results showed that the number of published articles per year was positively correlated with the 2011 Tohoku earthquake, 2016 Gyeongju earthquake, and 2017 Pohang earthquake, with the maximum numbers observed in 2011, 2018, 2019, and 2020. Most studies on the relationship between earthquakes and groundwater level addressed groundwater level fluctuations in the duration of the subject earthquake, with little consideration of the precursors. Groundwater level monitoring data, as well as hydrogeochemical information and microbial communities, may contribute to a more detailed understanding of groundwater flow and chemical reactions in bedrock caused by earthquakes. Therefore, the establishment of a national groundwater monitoring network for seismic monitoring and prediction is required.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2019.10a
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• pp.206-206
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• 2019

• Proceedings of the KSEEG Conference
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• 2002.04a
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• pp.89-90
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• 2002

• Economic and Environmental Geology
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• v.38 no.6 s.175
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• pp.707-716
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• 2005

Organic geochemical analyses including Rock-Eval pyrolysis, elemental analysis and stable carbon isotope analysis were performed to evaluate the characteristics of organic matter in the ODP Leg 127 Site 794A sediments and to understand paleoceanographic changes. Based on the TOC contents, C/N ratio, HI vs. OI, $\delta^{13}C_{org}$ and C/S ratio, results imply that dark layers containing a large amount of terrigenous organic matter were deposited under the suboxic/anoxic conditions, whereas the light layers containing largely marine organic matter were deposited under the oxic conditions. These results indicate that increasing surface-productivity by the input of a large amount of terrigenous organic matter from adjacent continent led to the deposition of dark layers during the interglacial highstands, whereas marine primary production and dilution caused by Kosa from the China desert area led to the deposition of light layers with the decreased to terrigenous organic matter during the glacial lowstands.

• Journal of the Korean earth science society
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• v.31 no.4
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• pp.301-312
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• 2010

Geochemical data have been regarded as one of the important environmental variables in the environmental management. Since they are often sampled at sparse locations, it is important not only to predict attribute values at unsampled locations, but also to assess the uncertainty attached to the prediction for further analysis. The main objective of this paper is to exemplify how indicator geostatistics can be effectively applied to geochemical data processing for providing decision-supporting information as well as spatial distribution of the geochemical data. A whole geostatistical analysis framework, which includes probabilistic uncertainty modeling, classification and risk analysis, was illustrated through a case study of cadmium mapping. A conditional cumulative distribution function (ccdf) was first modeled by indicator kriging, and then e-type estimates and conditional variance were computed for spatial distribution of cadmium and quantitative uncertainty measures, respectively. Two different classification criteria such as a probability thresholding and an attribute thresholding were applied to delineate contaminated and safe areas. Finally, additional sampling locations were extracted from the coefficient of variation that accounts for both the conditional variance and the difference between attribute values and thresholding values. It is suggested that the indicator geostatistical framework illustrated in this study be a useful tool for analyzing any environmental variables including geochemical data for decision-making in the presence of uncertainty.

• Bulletin of the Korean Institute for Industrial Safety
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• v.1 no.1
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• pp.7-10
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• 2001

화학공장에서 발생되는 중대산업사고(major industrial accident)는 그 영향이 공장내부에만 국한되지 않고 인근 지역의 주민들과 환경에까지 치명적인 영향을 미친다. 이러한 중대산업사고의 원인은 여러 가지가 있을 수 있으나 발열화학 반응공정에서 발생될 수 있는 폭주반응도 그 중 하나이다. 폭주반응에 의한 중대산업사고(major industrial accident)의 대표적인 사례로는 인도의 보팔(Bhopal)에서 methylisocyanate 누출사고와 이탈리아의 세베소(Seveso) 폭발사고를 들 수 있으며 보팔 사고의 경우 사망자수가 2,000명 이상이었고, 20,000명 이상이 부상하였으며, 세베소 사고의 경우 막대한 환경피해를 입혔다.(중략)

• Korean Journal of Environment and Ecology
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• v.18 no.2
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• pp.210-220
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• 2004

The purpose of this study is to propose the raw data of conservation and restoration by analyzing the environmental and growth characteristics in Abeliophyllum distichum habitats. The types of soil were sandy loam, loam and silty clay loam and the correlation on chemical characteristics of soil appeared that T-N and C.E.C were highly correlative. In case of growth characteristics, height and diameter in 1st site, crown in 2nd site, number of leaves in 5th site and number of seeds in 4th site were better than other sites. In the results of correlation on growth characteristics, height and diameter were highly correlative. In case of growth and chemical characteristics, EC and height were highly correlative. In the results of regression analysis, R-square of height and EC was some 70.4％ and that of number of leaves and T-N was some 70.2%. To conserve and restore Abeliophyllum distichum habitats, there were demanded that the accurate environmental analysis that considered such diverse factors as light intensity, temperature, genetic quality and so forth.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.1B
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• pp.161-168
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• 2008

The ecological environmental zones in coastal area, like tidal flat and salt marsh, were gradually decreased due to large scale of coastal development projects, reclamation and so on. Therefore, the development of artificial tidal flat and salt marsh has been emphasized in coastal area as mitigation concept and studies on related this background has performed. But studies on the quantitative evaluation for degree of restoration were insufficient. In this paper, as a fundamental study for evaluation of restoration on the creation of ecological environmental zones in coastal area, it was conducted that the monitoring and experiment for bio-chemical factors (bio-diversity, population and biomass of macro-benthos, survival ratio of reed, the number of heterotrophic bacteria and physico-chemical characteristics such as COD, IL, TN, TP and pH) using a in-situ pilot plant of tidal flat (Zone. P1) and salt marsh (Zone. P2), which was distinguished by content of dredged soil, in Jinudo, Nakdong estuary. From results of this study, the restoration index (RI), for evaluation concerning degree of restoration on the creation of ecological environmental zones in coastal area, was suggested and quantitative evaluation was performed using a restoration index (RI).

• 전기의세계
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• v.41 no.6
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• pp.7-11
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• 1992

연료전지는 연료가 가진 화학에너지를 전기화학반응에 의해 직접 전기에너지로 변환시키는 발전방식으로 에너지 변환효율이 높고 환경공해가 적어 도시부근이나 도심지 건물내 설치할 수 있으므로 전력계통운용이 용이하여 장래 화력발전 대체용이나 열병합발전용으로 유효하게 사용될 수 있는 등의 장점이 많아 국내의 개발이 활발이 진행되고 있다. 연료전지는 반응물질을 전지내에 저장헤 두는 1차전지(건전지등)나 2차전지(축전지)와는 달리 반응물질이 외부로부터 공급되는한 발전할 수 있으며 단위전지의 내부구조는 일반전지와 유사하나 에너지저장능력이 없는 발전장치이다.