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Jin, Younghee,Seung, Hyunjung,Oh, Younghee,Jung, Jihun,Jeon, Sujin,Lee, Jaekyoo,Kim, ChangKyu,Choi, Sungmin,Chae, Youngzoo 대한미생물학회 2013 Journal of Bacteriology and Virology Vol.43 No.1
Of total 1,438 specimens of patients with diarrhea in Seoul, 2011, 217 samples (15%) were found pathogenic Escherichia coli that included 192 strains (89%) of enterotoxigenic E. coli (ETEC) and enteroaggregative E. coli (EAEC). The highest isolation rate for ETEC and EAEC was found in August and September. Sixty two pathogenic E. coli strains (34 ETEC and 28 EAEC strains) were selected from 175 strains (94 ETEC and 81 EAEC strains) isolated in August and September. Of 94 strains characterized for ETEC phenotype, 76 (81%) expressed heat-stable toxin (ST) only. Antimicrobial susceptibility test was carried out by using sixteen types of antibiotics. A high level of antimicrobial resistance to tetracycline (57%), ampicillin and ticarcillin (54%) was observed among EAEC isolates while the highest resistance rate of ETEC was found for nalidixic acid (47%), followed by tetracycline (32%). As to the antimicrobial susceptibility test, EAEC showed the complicated multi-drug resistant patterns in which the resistance was higher than ETEC. Pulsed-field gel electrophoresis (PFGE) was carried out to examine the genetic relatedness among ETEC and EAEC isolates. Except for 11 strains, 51 strains were divided by eight pulsotypes. In PFGE analysis, isolates from foodborne disease outbreaks in August and September 2011 showed close relation.
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Rather Than Heat or Eat? Cold Weather and Consuming Behavior on Necessities in Korea
( Younghee Kim ),( Oh Sang Kwon ) 한국환경경제학회, 한국자원경제학회 ( 구 한국환경경제학회 ) 2017 한국환경경제학회 학술발표논문집 Vol.2017 No.하계
This study explores the consumption patterns of the poor by comparing elasticities between poor and non-poor households seasonally. As own prices change, food demand is the most inelastic among poor households but energy demand is among non-poor households. For the poor households, whereas the own-price elasticities of the necessities such as food, energy and health care are inelastic in non-winter season, the elasticities of energy and health care turn elastic in winter. Whereas the cross-price elasticities among necessities are almost zero in non-winter, the elasticities double higher in winter. These results show the poor households who live with budget constraints in non-winter season might reduce the essential consumptions in winter because of heating cost. In case of relative energy price increases because of outdoor temperature drops, poor households who have to consume more energy to keep the indoor temperature are found to choose more food consumption instead of heating consumption. In line with policies for climate change mitigation and sustainable environment, energy price increases are expected. Hence policy makers should consider the energy price shock on the poor households.
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An Analysis of User Satisfaction of K University’s Library Service
Younghee Noh,Min-Ju Choi,Yong-Wog Choi,Sin-Won Jeong,Eun-Ji Jung,Mi-So Kang,Jin-Young Kim,Kyung-Won Lee,Sung-Jae Lee,Seon-Hye Oh,So-Yeon Park,Sung-Chul Shin,Da-Jeong Suh 건국대학교 지식콘텐츠연구소 2011 International Journal of Knowledge Content Develop Vol.1 No.1
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CO<sub>2</sub> Capture by Semi-Dry Carbonation Reaction using Fly Ash from SRF Power Plant
( Oh-kyu Kwon ),( Younghee Kim ),( Woo-teck Kwon ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
The application of the fly ash from solid refused fuel (SRF) power plant for CO2 capture by semi-dry carbonation process have researched as an eco-friendly practicable CO2 reduction technique. To study the effects of humidity on the carbonation kinetics of fly ash, the fly ash was exposed to accelerated carbonation conditions at a relative humidity of 25, 50, 75, and 100 %. The CO2 capture performance of fly ash can be affected by the process conditions (humidity, concentration of CO2, and reaction time). Because of short diffusion length of H2CO3 in water, the semi-dry process shows faster and effective carbonation reaction than wet processes. This study can show the possibility of fly ash application with the semi-dry process for CO2 capture.
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슬러지 건조 발생 악취 제어를 위한 활성탄 흡착탑의 최적 유동특성 선정 연구
장영희(Younghee Jang),정현수(Hyeonsu Jeong),김준오(Jun Oh Kim),이예환(Ye Hwan Lee),최승원(Seungwon Choi),변성제(Seongje Byun),고영서(Youngseo Go),이상문(Sang Moon Lee),김성수(Sung Su Kim) 유기성자원학회 2022 유기성자원학회 학술발표대회논문집 Vol.2022 No.추계
본 연구에서는 슬러지 건조 과정에서 발생할 수 있는 악취를 제어하기 위해 흡착탑의 유동분석을 수행하였다. 다양한 환경 공정에서 발생하는 대기오염물질 및 악취물질은 심미적인 이유 외에도고농도 누출 시 인체에 유해한 영향을 미침에 따라 반드시 완전 제거를 목표로 삼아야 한다. 활성탄을 이용한 흡착법은 황화수소의 농도 및 각종 부하에 대한 유연성 그리고 낮은 처리비용으로 다양한흡착제들 중 가장 많이 이용되고 있다. 그러나 크게 두 가지의 문제점을 가지고 있어 이를 보완하고자 하는 연구가 다수 수행되고 있다. 첫째, 탈착물을 포함한 2차 오염물의 발생이다. 모든 흡착제의숙명이기는 하나 흡착법은 흡착제가 흡착할 수 있는 절대량이 존재하고, 특히 활성탄(Activated carbon, AC)은 재생 사용의 어려움이 있기 때문에 흡착효율을 증진시키기 위한 소재 개질 연구가 계속적으로수행되어야 한다. 둘째, 활성탄이 충진된 흡착탑은 과다한 압력손실, 높은 분진 발생률 등의 문제가있으므로 실 공정에서의 흡착탑의 효율을 극대화하기 위해 압력손실을 최소화하고 높은 접촉면접을갖는 최적 운전조건을 선정해야 한다. 활성탄별 압력손실 특성을 분석한 결과, 형태 및 크기에 따른압력손실 변화를 확인하였으며, 원통형 조립이 각형 활성탄 대비 약 28% 감소하였으며, 각 활성탄의압력 손실 특성은 특정 입자 크기와 모양을 가질 때 가장 낮은 압력 손실이 관찰되었다. 따라서 2~4 mesh 크기의 Carbon 범위와 불규칙한 모양이 흡착탑의 성능을 향상시키고 경제적 효율성을 확보할수 있다고 제안하였다.
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