http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
다환방향족탄화수소 생물정화실험을 위한 인공 퇴적물 개발연구
정홍배(Hong-Bae Jung),권개경(Kae Kyoung Kwon),김상진(Sang-Jin Kim) 한국해양환경·에너지학회 2004 한국해양환경·에너지학회 학술대회논문집 Vol.2004 No.-
Polycyclic aromatic hydrocarbons (PAHs) are toxic environmental contaminants Despite the practical difficulty, secure the enough amount of contaminated sediment having homogeneous characteristics was essential part for development of bioremediation techniques. Many researchers attempt to prepare artificially contaminated sediments, but it requires long time and hardly makes homogeneous products. For this reason we tried to develop artificial sediment based on clay mineral particles. The efficacy of coating and uniformity of coating on clay mineral of PAHs, one of the representative pollutants in sediment, were tested. As a result one ㎎ pyrene (or Benzo[a]pyrene)/g-clay mineral was surely coated (more than 99%) and showed only 12% (pyrene) or 9.5% (BaP) of standard deviation from 10 replicates. Biodegradability of PAHs coated on clay mineral was also compared with that of real sediment after 3 and 7 days of incubation. The degradation rates of PAHs in clay mineral were similar with that of real sediment. From the above results we suggested that artificial sediment based on clay mineral could substitute the real sediment for development of bioremediation techniques.
Hong-Bae Jung(정홍배),Kae Kyoung Kwon(권개경),Sang-Jin Kim(김상진) 한국해양환경·에너지학회 2004 한국해양환경공학회 학술대회논문집 Vol.2004 No.-
To develop the effective and environment-friendly remediation method of PAHs contaminated in marine sediment, the degradation rate of BaP and the Microtox toxicity of BaP degrading intermediates were evaluated by the combinatorial treatment of UV-C and BaP degrading bacteria, Nouosphingobium pentaromativorans, using artificial sediment based on alumina particles, on which BaP was coated. The degradation rates of BaP treated either by UV-C for one day or by bacterial inoculum for two days, were 59% or 78%, respectively. The toxicities of remaining BaP and degrading intermediates were 32% and 12.5%. To enhance the degradation rate of BaP, UV-C irradiation and bacterial degradation were combined. The first microcosm was irradiated by UV-C for one day followed by the bacterial degradation for additional one day and the second has been incubated with bacteria prior to UV-irradiation, The degradation rates in the two microcosms were increased to 94.2~99.6% compared to that of bacterial inoculation only. Toxicity was also decreased to 22~23.5% compared to that of 32%, UV-C irradiation only. The toxic intermediates presumably derived from UV treatment can be reduced by bacteria. It could be applicable as one of the effective and environment-friendly methods for the remediation of PAHs contaminated in marine sediment.
P형 우물 영역의 도핑 농도와 면적에 따른 4H-SiC 기반 DMOSFET 소자 구조의 최적화
안정준,방욱,김상철,김남균,정홍배,구상모,Ahn, Jung-Joon,Bahng, Wook,Kim, Sang-Chul,Kim, Nam-Kyun,Jung, Hong-Bae,Koo, Sang-Mo 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.7
In this work, a study is presented of the static characteristics of 4H-SiC DMOSFETs obtained by adjustment of the p-base region. The structure of this MOSFET was designed by the use of a device simulator (ATLAS, Silvaco.). The static characteristics of SiC DMOSFETs such as the blocking voltages, threshold voltages, on-resistances, and figures of merit were obtained as a function of variations in p-base doping concentration from $1\;{\times}\;10^{17}\;cm^{-3}$ to $5\;{\times}\;10^{17}\;cm^{-3}$ and doping depth from $0.5\;{\mu}m$ to $1.0\;{\mu}m$. It was found that the doping concentration and the depth of P-base region have a close relation with the blocking and threshold voltages. For that reason, silicon carbide DMOSFET structures with highly intensified blocking voltages with good figures of merit can be achieved by adjustment of the p-base depth and doping concentration.
Acid Sludge로 오염된 토양의 열탈착 공법 적용
박상민 ( Sang-min Park ),전필용 ( Pil-yong Jeon ),신수연 ( Su-yeon Shin ),박응렬 ( Eung-ryeol Park ),고성환 ( Sung-hwan Go ),정홍배 ( Hong-bae Jung ),백기태 ( Ki-tae Baek ) 한국환경기술학회 2016 한국환경기술학회지 Vol.17 No.1
본 연구는 Acid sludge 폐기물 매립에 의한 탄화수소로 오염된 인도네시아 정유플랜트 부지 토양을 대상으로 초기특성분석 및 열중량 분석(TGA-DSC)을 통해 열탈착 공법의 적용가능성을 확인하였다. 해당부지의 오염물질 성분은 GC/FID 분석을 통해 고체성분의 paraffin (C<sub>18</sub>H<sub>38</sub>~C<sub>37</sub>H<sub>76</sub>) wax계열로 확인되었다. 열중량 분석을 통해 질량변화가 가장 많은 구간은 364~461℃사이로 확인되었으며 이것은 이 온도 구간에서 대부분의 유기물이 제거되는 것을 나타낸다. 또한 약 400℃에서 가장 높은 DSC그래프가 나타났기 때문에 대부분의 유류오염물질들은 400℃에서 제거될 것으로 예상되었다. 이 결과를 기초로 열탈착 실험을 한 결과, 오염토양의 최적 열탈착 온도 조건은 약 350℃로 나타났으며 이 온도에서 TPH 농도는 인도네시아 환경기준 이하로 제거되었다. This study investigated the potential of thermal desorption of the soil contaminated with hydrocarbon in refinery site, Indonesia, which was contaminated by landfilling acid sludge. In this study, the characteristics of contaminated soil was confirmed and thermal gravimetric analysis (TGA) and differential scanning calorimeter (DSC) analysis were carried out. Contaminant was confirmed as paraffin (C<sub>18</sub>H<sub>38</sub>~C<sub>37</sub>H<sub>76</sub>) wax. In the results of TGA-DSC, the most of the organic matter was removed at 364~461℃ and the most contaminants was desorbed at 400℃. Based on these results, the optimum condition of thermal desorption was expected to 350℃ and hydrocarbons in the soil was removed under Indonesia standard in the temperature range
국내 하천 퇴적물 건강성평가를 위한 Microtox 독성시험 조건확립 연구
정홍배,박정규,문성환,류태권,김소정,배철한,황인영 한국환경독성학회 2001 환경독성보건학회지 Vol.16 No.4
1. 하천 퇴적물 공극수, 증류수 추출용액 및 유기용매 추출액을 pH6.0~6.5 범위로 조절한 후 Microtox 독성을 측정하는 것이 퇴적물내의 암모니아 독성이 배제된, 유해화학물질 오염에 의한 퇴적물 독성을 평가하는 방안임을 확인하였다. 2. 퇴적물에 대해 공극수, 증류수 추출물, 유기용매 추출물 구분하여 Microtox 독성을 구하는 것이 퇴적물 내 유해화학물질의 독성발현 특성을 예측할 수 있는 기법이라고 사료된다. 3. 조사정점 내 시료 채취 지점간 독성에 편차로 인하여, 동일 정점의 반경 50~100m 내에서 최소 4지점 이상의 퇴적물을 확보하는 것이 해당 정점의 독성 대표값을 산출할 수 있는 방안이 된다고 판단된다. 4. 한강수계인 남한강 지천인 복하천과 양화천, 금강수계인 청주 미호천, 대전 갑천, 낙동강수계인 대구 금호강, 영산강수계인 황룡강 그리고 익산 만경강을 대상으로 한 예비 조사한 결과, 집중연구대상 하천으로의 조건은 금호강이 가장 우수하였다. 5. 하천 퇴적물의 증류수 추출액과 유기용매 추출액의 Microtox 독성값 간의 상호 상관성이 높았다. 그러나, 농축 과정이 용이하므로 정점간 비교를 위한 독성 측정시 유기용매 추출액을 사용하는 것이 바람직하다고 사료되었다. Six rivers were selected as preliminary screening sites to determine the test conditions of Microtox in assessing the toxicity of the sediment. In addition, a pH range of 6.0--6.5 was established in testing pore water, aqueous extracts and organic extracts. Each extractable fraction of sediment showed different toxicities. Therefore, in order to properly examine the toxicity in the sediment, all extractable fractions of sediment samples needed to be tested with Microtox. Thus, sediment samples were additionally collected from at least 4 secondary sites within 50~100 m area of the primary sampling site to reduce any variation or deviation in toxicity assessment. From all sediment toxicity data that was collected from this study, it was concluded that the Keumho river was the most polluted with the highest sediment toxicity of all the rivers analyzed and needed further detailed research on its pollution problem.
대구지역 금호강 및 주요 지천 퇴적물의 시·공간적 독성변화
정홍배,문성환,정진애,김재현,박정규,배철한,황인영 한국환경독성학회 2001 환경독성보건학회지 Vol.16 No.4
1. 사전에 선정된 공통 조사 정점들 가운데 KㆍH4(금호대교)이후의 퇴적물 독성이 상부의 것보다 크게 나타났다. 즉, 정점 KH3과 KH4, 그리고 KH4와 KH5 사이에 독성물질 유입원이 있는 것으로 판단되었다. 2. 하천 퇴적물의 독성 수준에 영향을 주고 있는 물질의 종류와 배출원 파악이 필요하였다. 이러한 내용을 향후 계속적 연구 및 조사를 통하여 수행되어야 하는 과제라 사료된다. 3. 퇴적물 시료의 채취 시점에 따라서 동일 정점의 독성 변화가 심하였다. 유해화학물질에 의한 오염 수준과 하천 생태계의 영향을 예측하기 위해서는 하천 퇴적물을 대상으로 경시적으로 독성의 변화를 계속 관측하는 것이 필요하다고 판단되었다. In aqueous ecosystems, the level of toxicity is highly responsive dependant to multiple variables, including rainfall, sunlight, pH, adhesion, etc. Because Korea has particularly distinct wet and dry seasons, the toxicity of pollutants in rivers or streams is dependant on the sampling season and time. In order to examine the effects of rainfall on toxicity, sediment samples were collected from five sites along the Keumho river. It was found that Microlox toxicity levels were generally higher during the dry season than the wet season. It indicated that river pollutants are carried off more quickly by the water during the wet season. As a result, it was recommended that the point sources of pollutants of the Keumho river would be placed between KH3 (Paldalgyo) and KH4 (Keumhogyo), KH4 (Keumhogyo) and KH5 (Dasa).
박정규,황인영,문성환,정홍배 한국환경독성학회 2001 환경독성보건학회지 Vol.16 No.4
A new passive sampler was developed, improving SPMD (Semipermeable Membrane Devices) that contained triolein in nonporous, low-density polyethylene layflat tubing. Experiments to measure PAHs concentration were carried out at four sites (Dukpo, Sochi, Sohwonggando, Yeonmok) on the southern coast of Korea that were contaminated by oil spills. Passive samplers were deployed at 4 and 8 week intervals at each site. Results showed that bioconcentration levels of PAHs were increased in proportion to exposure duration from all sample sites and accumulation in the passive sampler was much higher than in biota at the Dukpo site. Results of these tests suggest that new passive sampler is a useful tool for measuring bioconcentration organic compounds in aquatic environments.