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이인정 ( In Jung Lee ),이철구 ( Chul Gu Lee ),허성남 ( Seong Nam Heo ),이재관 ( Jae Gwan Lee ),김혜란 ( Hye Ran Kim ),양득석 ( Deuk Seok Yang ),김종하 ( Jong Ha Kim ),이용희 ( Yong Hee Lee ) 한국환경분석학회 2011 환경분석과 독성보건 Vol.14 No.3
There are many industrial factories in the central Nakdong river basin and have been occurred water pollution accidents by hazardous chemicals such as phenol, 1,4-dioxane and perchlorate. The object of this study is to establish the database on the hazardous chemicals for the industrial wastewater and to prevent the pollutant accident of the Nakdong river. We categorized 20 hazardous chemicals potentially discharged into the Nakdong river. The concentrations of 20 compounds were measured in surface water samples, wastewater treatment plants(WWTPs) influents/effluents and wastewater discharge facilities in the Nakdong River basin. One compound( 1,4-dioxane) was detected in surface waters and three(1,4-dioxane, perchlorate, vinyl acetate) were detected in WWTPs. Eleven compounds(beryllium, perchlorate, 1,3-butadiene, vinyl acetate, ethyl acrylate, styrene, hexachloroethane, 1,4-dioxane, diethyl phthalate, di-n-butyl phthalate, 4,4`-bisphenol A) were detected in wastewater discharge facilities. 1,4-Dioxane was most frequently observed in surface waters, WWTPs and wastewater discharge facilities.
이철구(Cheol-gu Lee),하영철(Young-chul Ha),허재영(Jae-young Her) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
This study was experimentally performed in order to estimate the errors due to the leakage of transmitter gaugelines in the orifice flow meter for natural gas. It would be a serious problem in safety if a large quantity of leak was occurred at the tubes or fittings like valve. But in most cases the safety problems might be rarely happened because the gas leak detectors could be operated in advance and the various kinds of inspection would be also fulfilled periodically. If the leakage was occurred continuously with an undetectable amount at the gaugelines for measuring the pressure or the differential pressure(DP), the amount of leakage might be an error or an unaccounted flow(UAF). In addition if the measuring value of pressure or DP were affected by the leakage, it might also be a measurement error. The experiments were performed to estimate the amount of leakage and to check the DP changes if it exited. First, through the measurement of the air pressure changes in the airtight container connected to a transmitter with gaugelines as the time passed, the amount of leakage causing from the fittings of gaugelines was roughly estimated.<br/> As changing the leak position of the gaugeline, the leak was intentionally made to break out. The variance of DP was checked as controlling the extent of leakage and compared to no leak conditions. Consequently, under the normal maintenance conditions, the result represented that the amount of leakage causing from the gaugelines was insignificant and also the DP changes on leakage conditions were too small to cause the errors of measurements.
김해솔,임라주,김혜은,이철구,서정민,이석구,Kim, Hae-Sol,Im, Ra-Joo,Kim, Hye-Eun,Lee, Chul-Gu,Seo, Jeong-Meen,Lee, Suk-Koo 대한소아외과학회 2007 소아외과 Vol.13 No.2
Liver tumors in children are rare, relatively complex, and encompass a broad spectrum of disease processes. This study reviews our experience of liver tumors during the last 10 years. Medical records of 36 cases of liver tumors in children, treated at Samsung Medical Centers, from October 1994 to December 2005, were reviewed in this study. We analyzed disease characters and survival rates as a whole and by specific disease. The median age was 3.6 years. Male and female ratio was 1:1. The most common symptom was the palpable mass in 15 cases. Others were abdominal distension in 9 cases, jaundice in 2, vomiting in 2, weight loss in 2, and pubic hair growth in 1. CT or US and liver biopsy were performed for diagnosis. There were 28 malignant tumors: malignant rhabdoid tumor (1 case), hepatocellular carcinoma (3 cases), hemangioendothelioma type II (3 cases), angiosarcoma (1 case), and hepatoblastoma (20 cases). Eight tumors were benign; hepatic adenoma (1 case), focal nodular hyperplasia (2 cases), hemangioendothelioma type I (2 cases), mesenchymal hamartoma (3 cases). In this study the clinical characteristics were not different from the other reports. Liver transplantation was performed in 3 cases-1 with hepatoblastoma and 2 with hepatocelleular carcinoma. Accurate and early diagnosis, and individualized multimodality therapeutic approaches might be important for better outcome.
국내 하천수 및 하수처리장 유입·방류수의 합성머스크화합물 오염실태 조사
이인정(In Jung Lee),이철구(Chul Gu Lee),허성남(Seong Nam Heo),이재관(Jae Gwan Lee) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.11
합성머스크화합물은 개인이 일상생활에서 광범위하게 사용하는 비누, 화장품, 향수, 세제, 방향제 등에 향료로 사용되며 하·폐수 처리시설에서 완벽하게 제거되지 않고 생활하수에 포함된 상당수의 양이 환경 중으로 배출되고 있다. 외국사례의 경우 하천, 해양, 토양, 저질, 생물상 등 다양한 환경매체에서 검출되고 있으며, 잔류성·생물농축성이 있어 지속적으로 노출 시 생태계 및 인간의 건강에 심각한 영향을 끼칠 우려가 있다. 합성머스크화합물 15종(musk ketone, musk xylene, musk ambrette, musk moskene, musk tibetene, HHCB, AHTN, ADBI, AHDI, DPMI, ATII, ethylenebrasssylate, ambretettolide, cyclopentadecanolide, OTNE)을 액액 추출법으로 전처리 한 후 GC/MS로 분석하였으며, 방법검출한계는 0.005~0.398 μg/L로 나타났다. 낙동강 유역의 하천수 20개 지점 및 하수처리장 6개 지점을 조사한 결과 일부 조사대상 물질이 검출되었다. HHCB와 AHTN은가장 검출빈도가 높은 항목으로 대부분의 하천수 및 하수처리장 유입·방류수에서 검출되었으며, 검출농도는 외국의 조사결과와 유사한 수준이었다. Synthetic musk compounds are widely used as fragrances in a variety of personal care products like soaps, sampoos, cosmetics and perfumes. The occurrence of synthetic musk compounds in municipal sewage effluent and other environmental samples could negatively impact the health of the ecosystem and humans, due to persistent and long-term chronic exposure of aquatic organisms. Fifteen synthetic musk compounds (musk ketone, musk xylene, musk ambrette, musk moskene, musk tibetene, HHCB, AHTN, ADBI, AHDI, DPMI, ATII, ethylenebrasssylate, ambretettolide, cyclopentadecanolide, OTNE) were analysed in surface waters and sewage treatment plants (STP) influents/effluents in Korea by GC/MS. Method detection limits were 0.005~0.398 μg/L. HHCB and AHTN were most frequently observed in both surface waters and STP influents/effluents.