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RISS 인기검색어
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- 저자 : 김윤중 ( Yun Jung Kim ) (검색결과 51 건)
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16S rRNA 염기서열을 이용한 낮은 용존산소농도에서 발생한 벌킹슬러지의 우점종 분석
김윤중 ( Yun Jung Kim ),박은혜 ( Eun Hye Park ),김규동 ( Gyu Dong Kim ),남경필 ( Kyoung Phile Nam ),정태학 ( Tai Hak Chung ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.5
Maintaining dissolved oxygen (DO) at sufficiently low concentration in the aeration tank at a wastewater treatment plant (WWTP) is essential for reduction of the costs of operation and maintenance. On the other hand, the low DO level may result in adverse effect on the integrity of the activated sludge. A typical and disastrous outcome frequently experienced is the outgrowth of filamentous microorganisms, which is called as filamentous bulking. In addition to the traditional methods such as sludge settleability and microscopic observation of the culture, molecular techniques including polymerase chain reaction (PCR) amplification followed by 16S rRNA sequencing were applied to identify filamentous bacteria present in bulking sludge under a condition of low DO concentration. Two morphologically distinct groups, presumably consisting of Sphaerotilus natans, and Eikelboom Type 1701 or Type 1851, were identified through microscopic observation. They were further confirmed by subsequent 16S rRNA sequencing. Dominant filamentous bacteria identified by the molecular techniques were consisted of three major groups. Sequences of partial 16S rRNA cloned showed that the filamentous bulking organisms were closely related to Eikelboom Type 021N and Eikelboom Type 1701, and Sphaerotilus natans, respectively. Molecular methods were found to possess a strong potential of direct examination of the microbial community of an activated sludge system.
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김윤중(Yun Jung Kim),스티븐김(Steven Kim),조광섭(Guangsup Cho) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
장수명과 고효율을 얻기 위해서는 발광다이오드 칩 구조 등의 성능 향상뿐만이 아니라, LED 칩(Chip)에서 발생되는 고열을 제거하는 방열 기술을 필요로 하고 있다. 본 연구는 표준적으로 사용되는 LED 조명기구의 발열특성, 열에 의한 광속 감소와 열저항을 통해 LED 조명기구의 효율 저하 요소에 대해 분석 하였다. LED 조명기구의 온도 상승이 약 7%정도의 광속 손실을 발생 시켰으며, 온도 측정을 통해 방열에 방해가 되는 조명기구의 구조적인 요소를 분석한 결과 Fin의 폭이 가장 큰 영향을 미치고 있음이 발견되었다. 따라서 LED 조명기구의 설계에 있어 열이 전달되는 충분한 통로를 확보하는 것은 매우 중요한 요소이다. For long life time and high efficiency, not necessary in improvement of LED chip structure, but also improve heat radiation for decrease heat in LED chip. In this study, efficiency decline factor has been investigated in LED lamp as study heat characteristic, luminance flux and heat resistance. When LED lamp temperature was increased, about 7% loss of luminance flux. In consequence of temperature analysis, width of fin was the most important factor of heat radiation. As a result, secure the enough heat path is very important factor of LED lamp design.
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