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최희철(Hee Chol Choi),조윤아(Yoon A Cho),최상일(Sang Il Choi),이태진(Tae Jin Lee) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.5
토양으로부터 농화배양된 두 미생물 군집의 디젤 분해 특성과 미생물의 군집 양상을 살펴보았다. 간균 형태를 띄는 두 군집은 육안으로 뚜렷히 구별되는 황색(YE-5)과 투명한 형태(WH-5)의 콜로니를 형성하였으며 1% 디젤 오염된 배지에서 26일간 배양하였을 때 디젤 분해율은 99.07 mg-Diesel/L·day와 57.82mg-Diesel/L·day로 YE-5가 약 1.7배정도의 빠른 분해속도를 나타내었다. YE-5에 의한 디젤의 분해양상은 C8-C₂4 전반에 걸쳐고르게 분해되는 양상을 보여주었다. PCR-DGGE 기법을 이용하여 YE-5를 동정한 결과 Psedomonas, Klebsiella, Escherichia, Stenotrophomonas 등이 관찰 되었으며 모두 단백세균에 속하는 것으로 분석 되었고 YE-5에서만 Uncultured Stenotrophomonas sp.가 관찰되었다. 본 실험을 통해 디젤의 효과적 분해를 위해 적절한 군집의 조합이 필요하다는 것을 알 수 있었으며 Escherichia hermannii나 Uncultured Stenotrophomonas sp.와 같은 기 보고되지 않은 종들이 디젤 분해에 미치는 영향에 관한 후속연구가 필요할 것으로 판단하였다. This study investigates characteristics of diesel degradation and variations of microbial community with the soil enrichment cultures. The cultures has yellow(YE-5) and transparent color`s(WH-5) colony on solid plate medium. The bacillus type of YE-5 and WH-5 cultures showed diesel degradation at the rate of 99.07mg-Diesel/L·day and 57.82 mg-Diesel/L·day in the presence of 1%(v/v) initial diesel concentration. Diesel degradation was 1.7 times faster than WH-5 culture. YE-5 or WH-5 culture could degrade a wide range of diesel compounds from C8 to C₂4. Microbial community analysis by PCR-DGGE technique shows that Psedomonas, Klebsiella, Escherichia and Stenotrophomonas as proteobacteria take role on the diesel degradation. uncultured Senotrophomonas sp. was only detected with YE-5 culture. It is concluded that proper combination of the microorganism should be present to stimulate the degradation of diesel and further studies are recommended for the effect of uncultured Senotrophomonas sp. or Escherichia hermannii on diesel degradation.
유전체 염기서열의 base - composition에 대한 연구
정철희(Chol-Hee Jung),윤경오(Kyong-Oh Yoon),최진영(Jin-Young Choi),박현석(Hyun-Seok Park) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1A
생물체가 생명을 영위하기 위해 수행하는 모든 기능들에 대한 정보는 각 개체가 가지고 있는 유전체에 들어있다. 그런데 각 생물체마다, 심지어는 한 생물체의 서로 다른 염색체마다 그 전체 염기서열에서의 base-composition 은 같지 않고, 또한 이 구성비에는 일정한 특징이 있다. 따라서 이 논문에서는 각 생물체들의 전체 염기서열을 구성하는 염기의 구성비에 대해 조사하고 비교해 보고자 한다.
Report on the Cooperative Experimental Study Program
Kim, Hun-Chol,Yang, Seung-Il,Lee, Seung-Hee,Kim, Eun-Chan,Kang, Kuk-Jin,Lee, Young-Gill,Kim, Yoon-Ho,Lee, Kwi-Joo,Kwak, Young-Ki,Joa, Soon-Won,Kim, Hyo-Chul,Van, Suak-Ho,Kim, Wu-Joan,Song, Mu-Seok,Cho 대한조선학회 1987 大韓造船學會誌 Vol.24 No.3
The present paper describes the results of the cooperative experimental study organized by the Resistance Committee of the Korea Towing Tank Conference, which aims to improve model testing technique and accuracy and to self-evaluate their own capabilities. A Series 60, $C_b=0.60$ model was tested at the towing tanks of Korea Institute of Machinery & Metals, Hyundai Maritime Research Institute, Seoul National University, and Inha University. Results for total resistance, wave pattern analysis, wave pattern analysis, wave profile, trim & sinkage and wake measure ments are presented.
Seo, Seon Hee,Jeong, Eun Ji,Han, Joong Tark,Kang, Hyon Chol,Cha, Seung I.,Lee, Dong Yoon,Lee, Geon-Woong American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.20
<P>Electrocatalytic materials with a porous structure have been fabricated on glass substrates, via high-temperature fabrication, for application as alternatives to platinum in dye-sensitized solar cells (DSCs). Efficient, nonporous, nanometer-thick electrocatalytic layers based on graphene oxide (GO) nanosheets were prepared on plastic substrates using electrochemical control at low temperatures of ≤100 °C. Single-layer, oxygen-rich GO nanosheets prepared on indium tin oxide (ITO) substrates were electrochemically deoxygenated in acidic medium within a narrow scan range in order to obtain marginally reduced GO at minimum expense of the oxygen groups. The resulting electrochemically reduced GO (E-RGO) had a high density of residual alcohol groups with high electrocatalytic activity toward the positively charged cobalt-complex redox mediators used in DSCs. The ultrathin, alcohol-rich E-RGO layer on ITO-coated poly(ethylene terephthalate) was successfully applied as a lightweight, low-temperature counter electrode with an extremely high optical transmittance of ∼97.7% at 550 nm. A cobalt(II/III)-mediated DSC employing the highly transparent, alcohol-rich E-RGO electrode exhibited a photovoltaic power conversion efficiency of 5.07%. This is superior to that obtained with conventionally reduced GO using hydrazine (3.94%) and even similar to that obtained with platinum (5.10%). This is the first report of a highly transparent planar electrocatalytic layer based on carbonaceous materials fabricated on ITO plastics for application in DSCs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-20/acsami.5b01938/production/images/medium/am-2015-01938y_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b01938'>ACS Electronic Supporting Info</A></P>
윤대희(Dae-Hee Yoon),황돈하(Don-Ha Hwang),신병철(Byoung-Chol Shin),김용주(Yong-Joo Kim),이광식(Kwang-Sik Lee) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-
Recently many research activities on the diagnosis of stator winding insulation of large rotating machines have been reported. Capacitive couplers are widely used as sensors for on-line partial discharge (PD) measurement of high voltage rotating machines. This paper presents laboratory test to compare Stator Slot Coupler (SSC), Resistance Temperature Detector (RTD), 80 [pF] coupler and 500 [pF] coupler for on-line PD measurement of rotating machines. And a novel on-line monitoring system for an insulation diagnosis is proposed.