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이만재,박치영,곽재정,유보열,기장도,박찬국,김만우,김정용 조선대학교 1995 The Medical Journal of Chosun University Vol.20 No.1
Tuberculosis of duodenum is so rare and is usually secondary to pulmonary or intestinal tuberculosis . It is difficult to diagnose duodenal tuberculosis in clinical and radiologic findings due to its non-specific symptoms and inconsistent lesion. The diagnosis was made on the basis of the histological study of the endoscopic biopsy and resected surgical specimen. so we report a case of tuberculosis of duodenal bulb and of ascending colon with, the brief review of the literatures.
함세영,김무진,강래수,정재열,차용훈,장성 부산대학교 환경문제연구소 2003 環境硏究報 Vol.21 No.-
According to favorable water quality, groundwater is used as subsitutive water resources for surfare water. However, groundwater is contaminated more and more due to industrialization and population increase. This study assesses groundwater vulnerability to contaminants in 12 dongs (administrative districe) of Changwon city using with DRASTIC. DRASTIC was originally applied to the situations that contamination sources are on ground surface, and contaminants flow into groundwater with infiltration of rainfall. In addition to DRASTIC factors, groundwater contamination in urban area is also related with overpumping and with lowering of water level. Correlation coefficient between mumimum values of DRASTIC index and unfitness rate to drinking water quality for 10 dongs is low as 0.40. On the contrary, the correlation coefficient between minimum values of DRASTIC index and groundwater discharge rate and that between minimum values of DRASTIC index and well distribution density are 0.70 and 0.87, respectively. Thus, to evaluate the potential of groundwater contamination in urban areas, it is necessary to consider other factors such as groundwater abstraction rate and well density per unit area with ratings and weights as well as existing six DRASTIC factors.
( Jae Yeol Cheong ),( Se Yeong Hamm ),( Dong Chan Koh ),( Chung Mo Lee ),( Sang Min Ryu ),( Soo Hyoung Lee ) 대한지질공학회 2016 지질공학 Vol.26 No.1
Groundwater flow paths and groundwater ages at a radioactive waste repository located in a coastal area of South Korea were evaluated using the hydrochemical and hydrogeological characteristics of groundwater, surface water, rain water, and seawater, as well as by numerical modeling. The average groundwater travel time in the top layer of the model, evaluated by numerical modeling and groundwater age (34 years), approximately corresponds to the groundwater age obtained by chlorofluorocarbon (CFC)- 12 analysis (26.34 years). The data suggest that the groundwater in wells in the study area originated up-gradient at distances of 140.230 m. Results of CFC analyses, along with seasonal variations in the δ18O and δD values of groundwater and the relationships between 222Rn concentrations and δ18O values and between 222Rn concentrations and δD values, indicate that groundwater recharge occurs in the summer rainy season and discharge occurs in the winter dry season. Additionally, a linear relationship between dissolved SiO2 concentrations and groundwater ages indicates that natural mineralization is affected by the dilution of groundwater recharge in the rainy summer season.
Analyzing groundwater change on a volcanic island caused by the impact of the M9 Sumatra earthquake
Jae-Yeol Cheong,함세영,김상현,Soo-Hyoung Lee,우남칠,김규범 한국지질과학협의회 2013 Geosciences Journal Vol.17 No.2
Changes in groundwater level have been recognized by the earthquakes at various epicentral distances. The M9 Sumatra earthquake resulted in changes in the groundwater level, electrical conductivity, and temperature in monitoring wells on Jeju Island, South Korea. In regions of different groundwater type (basal, lower parabasal, upper parabasal, and high-level groundwater), the changes in the groundwater levels at 25 monitoring wells ranged between 4.0 and 49.5 cm; changes in the electrical conductivity at six monitoring wells ranged between 1 and 27,975 mS/cm; and the changes in water temperature at three wells ranged between 0.02 and 1.37 ûC. The irregular groundwater level changes at different locations on the island due to the earthquake reflect various interactions between hydrological properties and seismological processes. The impact of the earthquake was successfully recognized via transfer function modeling between the time series of groundwater level and the tidal oscillation. On the basis of the theoretical aquifer response to the earthquake, storage coefficient estimates for aquifers, which could not be determined from the single-well pumping tests, were determined to be within the range of 1.22•10–4–3.51•10–6.
( Jae-yeol Cheong ),( Se-yeong Hamm ),( Hyoung-soo Kim ),( Soo-hyoung Lee ),( Heung-jai Park ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.10
At riverbank filtration sites, groundwater levels of alluvial aquifers near rivers are sensitive to variation in river discharge and pumping quantities. In this study, the groundwater level fluctuation, pumping quantity, and streamflow rate at the site of a riverbank filtration plant, which produces drinking water, in the lower Nakdong River basin, South Korea were interrelated. The relationship between drawdown ratio and river discharge was very strong with a correlation coefficient of 0.96, showing a greater drawdown ratio in the wet season than in the dry season. Autocorrelation and cross-correlation were carried out to characterize groundwater level fluctuation. Autoregressive model analysis of groundwater water level fluctuation led to efficient estimation and prediction of pumping for riverbank filtration in relation to river discharge rates, using simple inputs of river discharge and pumping data, without the need for numerical models that require data regarding several aquifer properties and hydrologic parameters.
정재열 ( Jae Yeol Cheong ),함세영 ( Se Yeong Hamm ),유일륜 ( Il Ryun Yu ),황학수 ( Hak Soo Whang ),김상현 ( Sang Hyun Kim ),김문수 ( Moon-su Kim ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.12
When constructing tunnels, it is important to understand structural, geological and hydrogeological conditions. Geumgeong tunnel that has been constructed in Mt. Geumjeong for the Gyeongbu express railway induced rapid drawdown of groundwater in the tunnel construction area and surroundings. This study aimed to analyze groundwater flow system and baseflow using long-term monitoring and groundwater flow modeling around Geumgeong tunnel. Field hydraulic tests were carried out in order to estimate hydraulic conductivity, transmissivity, and storativity in the study area. Following the formula of Turc and groundwater flow modeling, the annual evapotranspiration and recharge rate including baseflow were estimated as 48% and 23% compared to annual precipitation, respectively. According to the transient modeling for 12 years after tunnel excavation, baseflow was estimated as 9,796 - 9,402 m3/day with a decreasing tendency.
정재열 ( Jae Yeol Cheong ),함세영 ( Se Yeong Hamm ),김형수 ( Hyoung Su Kim ),손건태 ( Keon Tae Son ),차용훈 ( Yong Hoon Cha ),장성 ( Seong Jang ),백건하 ( Keon Ha Baek ) 대한지질공학회 2003 지질공학 Vol.13 No.4
본 연구에서는 창원시 대산면 강변여과수 취수장 부지의 지하수위 변동 특성을 분석하였다. 지하수위 및 하천수위 변동과 하천-대수층간의 상호작용은 장기적으로 취수정의 적정양수량을 평가하는데 중요하다. 2003년 2월부터 2003년 10월까지의 지하수위 분포를 보면 지하수위는 대체로 배후지쪽에서 낙동강쪽으로 갈수록 낮아지는 경향성을 보이고 있으며, 수두경사는 0.008 정도를 나타낸다. 그러나, 취수정의 양수와 강수량에 의한 낙동강 수위 상승에 의해 일시적으로 유동방향이 역전되기도 한다. 낙동강 수위는 강수량 변화에 따라 해수면 기준으로 0 ∼ 10m를 보인다. 6개 지하수 관측공(DS1, DS2, DS3, DS4, DS6, DS7)에 대해서 자기상관분석을 실시한 결과, 세 개의 그룹으로 분류되었다. 1그룹(DS1호공과 DS3호공)은 강한 선형성과 기억효과를 보여주고, 2그룹(DS2호공과 DS6호공)은 중간정도의 선형성과 기억효과를 나타내며, 3그룹(DS4호공과 DS7호공)은 가장 약한 선형성과 기억효과를 보였다. 1그룹은 낙동강수위변화의 영향을 상대적으로 많이 받고, 2그룹은 낙동강수위와 취수량의 영향을 동시에 받으며, 3그룹은 취수량의 영향을 가장 많이 받는 것으로 분석되었다. This study aims to elucidate characteristics of groundwater level fluctuation at riverbank filtration sites in Daesan-myeon, Changwon City. Groundwater level fluctuation, river water level change and stream-aquifer interaction are very important to estimate optimal discharge rate of the pumping well. Water level contours from February 2003 to October 2003 show normal decreasing trend toward the Nakdong river with the hydraulic gradient of 0.008. However, flow reversion occurs when groundwater is discharged at the pumping wells or rise of the Nakdong river by rainfall. The fluctuation of the Nakdong river ranges 0 - 10 m msl. Autocorrelation analysis was conducted to the groundwater levels measured on the six monitoring wells (DS1, DS2, DS3, DS4, DS6 and DS7). The analyzed waterlevel data can be grouped into three: group 1 (DS1 and DS3) represents strong linearity and long memory effect, group 2 (DS1 and DS6) intermediate linearity and memory, and group 3 (DS4 and DS7) weak linearity and memory. Waterlevels of group 1 wells are relatively closely related to the change of river-water level. Those of group 2 wells are largely affected by the pumping and the river-water level, and those of group 3 wells are strongly linked to pumping.