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무전해 은도금된 활성탄소섬유의 바이오에어로졸 저감 특성
윤기영(Ki-Young Yoon),변정훈(Jeong-Hoon Byeon),고병주(Byung-Ju Ko),박재홍(Jae-Hong Park),황정호(Jungho Hwang),윤희승(Hee-Seung Yoon),유승곤(Seung-Kon Ryu) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Bioaerosols are airborne particles of biological origins, including viruses, bacteria, fungi, and all varieties of living materials. In suitable hosts, bioaerosols are capable of causing acute or chornic diseases that may be infectious, allergenic, or toxigenic. Bioaerosols from outdoor air accumulate on filters of heating, ventilating and air conditioning (HVAC) system in large quantities and are able to multifly there under certain conditions. In this study, silver nanoparticles were coated on activated carbon fiber (ACF) filters by electroless plating method and their efficacy for bioaerosols removal were tested. Physical filtration and biological antimicrobial test were performed.
무전해 은도금된 활성탄소섬유필터의 바이오에어로졸 저감 특성
윤기영(Ki-Young Yoon),변정훈(Jeong-Hoon Byeon),고병주(Byung-Ju Ko),박재홍(Jae-Hong Park),김명운(Myeong-Woon Kim),윤희승(Hee-Seung Yoon),황정호(Jung-Ho Hwang) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.2
Bioaerosols are airborne particles of biological origins including viruses, bacteria, fungi, and all varieties of living materials. In suitable hosts, bioaerosols are capable of causing acute or chornic diseases that may be infectious, allergenic, or toxigenic. Bioaerosols from outdoor air accumulate on filters of heating, ventilating and air conditioning (HVAC) system in large quantities and are able to multiply there under certain conditions. In this study, silver was coated on activated carbon fiber (ACF) filters by an electroless plating method, and their efficacy for bioaerosols removal was tested. Physical filtration and biological antimicrobial test were performed. SEM and XRD analyses were used to characterize the morphology and components of ACF filters. Electroless silver-plated ACF filters showed antimicrobial efficiency, whereas pure ACF filters did not. It was found that electroless silver plating did not influence the physical filtration efficiency of ACF filters.
금은화 추출물의 항산화 효과를 통한 세포 보호효과 및 유전자 발현 양상
조원준(Won June Cho),윤희승(Hee Seung Yoon),김용현(Yong Hyun Kim),김정민(Jung Min Kim),유일재(Il Jae Yoo),한만덕(Man-Deuk Han),방인석(In Seok Bang) 한국생명과학회 2013 생명과학회지 Vol.23 No.8
금은화의 메탄올 추출에 의한 유기 용매별 분획에서 항산화 효과를 근거로 에틸 아세테이트 분획에서 H₂O₂로 유도된 RAW 264.7 세포독성에 대한 세포보호 효과와 유전자 발현 양상을 분석하였다. 용매별 분획의 항산화 활성은 시료의 농도가 증가할수록 DPPH에 대한 전자공여능도 증가하였으며, ED50은 에틸 아세테이트 분획에서 39.56 μg/ml로 가장 높게 나타났다. 또한 H2O2에 의해 유도된 Raw 264.7 세포사멸((IC50)에 대하여 에틸 아세테이트 분획은 농도 의존적으로 유의적인 세포 생존율과, 100 μg/ml의 농도에서 82.49%의 세포보호 효과를 나타내었다. 한편 IC50의 H₂O₂ 독성에 대한 에틸 아세테이트 분획의 Raw 264.7 세포보호 효과에 관련된 유전자 발현의 패턴은 BHA와 유사한 것으로 나타났다. 항산화 관련 유전자군의 비교 분석에서는 에틸 아세테이트 분획과 BHA는 매우 유사한 유전자 발현 양상을 보였으나, 세포 내 주요 항산화 효소를 만드는 유전자 중 하나인 heme oxygenase1 (Hmox1) 유전자의 발현 정도가 에틸 아세테이트 분획에서 4 배 이상 증가하였다. 항염증 관련 유전자군의 비교에서는 T-box transcription factor (Tbx21)가 BHA 처리군에서는 2 배 감소하였으나 에틸 아세테이트 분획의 처리군에서는 오히려 약 2 배 증가한 것으로 나타났다. In this study, based on the antioxidative effects in organic solvent fractions obtained from the main methanolic extract of L. japonica, the protective cellular effects and gene expression patterns of ethyl acetate fractions on H₂O₂-induced Raw 264.7 cell death (IC50) were analyzed. The antioxidant activity of the fractions measured using DPPH free radical scavenging activity increased in a dose-dependent manner, and the ED50 exhibited the highest 39.56 μg/ml in the ethyl acetate fraction. In addition, the ethyl acetate fractions’ cell viability on H₂O₂-induced Raw 264.7 cell damage increased in a concentration- dependent manner, showed a visible cell survival rate of 82.49% at a concentration of 100 μg/ml. The gene expression patterns related to the ethyl acetate fractions’ cytoprotective effect in H₂O₂-induced Raw 264.7 cell damage presented similar patterns to those of BHA. In comparative analysis for antioxidant activity-related genes affected by ethyl acetate fractions and BHA in H₂O₂-induced Raw 264.7 cells, both ethyl acetate fractions and BHA showed very similar gene expression patterns, but the gene expression level of the heme oxygenase 1 (Hmox1) gene making antioxidant enzymes in cells was four times higher in ethyl acetate fractions than BHA. In inflammation-related genes in H₂O₂induced Raw 264.7 cells, the T-box transcription factor (Tbx21) gene was expressed about two times more frequently in the ethyl acetate fraction treatment group, while it was expressed half as frequently in the BHA treatment group.
피치계 활성섬유탄소의 무전해 구리 코팅 및 NO 저감특성
변정훈(Jeong Hoon Byeon),윤희승(Hee Seung Yoon),황정호(Jungho Hwang),유승곤(Seung Kon Ryu) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Removal of NO was carried out on electroless copper-plated activated carbon fiber (ACF/Cu) based on three different copper plating times in a packed bed tubular reactor under varying reaction temperatures (300-400℃) under fixed inlet NO concentration (160ppm, N₂ carrier). Pitch fibers were prepared from identical petroleum-derived isotropic pitch precursors (IPPs) by meltspinning. The fibers obtained were stabilized, carbonized, and then activated by steam. The ACF was sensitized with Pd-Sn catalytic nuclei via a single-step activation approach. This sensitized ACF was used as precursors for obtaining copper plated ACF via electroless plating. Sensitization of the ACF surfaces promoted specific plating of copper on the ACF surfaces. As a result, ACF uniformly coated with copper particles were obtained with reduced copper plating in the reaction solution.
구리가 코팅된 활성섬유탄소의 항균 및 VOC 흡/탈착 특성
변정훈(Jeong Hoon Byeon),윤기영(Ki Young Yoon),박재홍(Jae Hong Park),고병주(Byung Ju Ko),윤희승(Hee Seung Yoon),황정호(Jungho Hwang),유승곤(Seung Kon Ryu) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The aim of this study is to assess the applicability of simultaneous control of a microbial colonization and a volatile organic compounds (VOC) penetration using a copper plated activated carbon fiber (ACF). Antimicrobial material, generated by using an electroless copper-plating, applied to the ACF filter media and tested for their ability to reduce microbial colonization and VOC penetration. This study contribute to the filtration complexity problems concerning the removal of microbial contamination and VOC penetration of air filters in the heating, ventilating, air-conditioning and air cleaning systems commonly used in indoor environments, hospitals, electronic industry, pharmaceutical industry and other environments where the absence of contaminating microorganisms and VOC is required.
송민영(Min-Young Song),정세진(Se-Jin Jung),박영권(Young-Kwon Park),윤희승(Hee-Seung Yoon),유재희(Jaihee Yoo),전종기(Jong-Ki Jeon) 한국실내환경학회 2008 한국실내환경학회지 Vol.5 No.3
The importance of indoor air environment gets higher because time of staying in indoor such as house or car become longer due to a change of the life pattern on human society. One of major pollution sources, VOCs or odor could be reduced or controlled by using adsorbent. It may be valuable for used catalyst to be applied in the adsorption of VOCs or odor. This could reduce the cost of adsorbent. In this work, the potential of used zeolites such as HZSM-5 catalyst and FCC catalyst as an adsorbent for removing acetaldehyde was investigated. Their adsorptive performances were compared with those of active carbon and MCM-41. The removal performace of used HZSM-5 was similar to that of active carbon due to its higher surface area. But used-FCC catalyst showed the lowest performance. These results suggest that used HZSM-5 can be applied to cheap adsorbent for acetaldehyde removal.
日帝 統治時代 『皇民化』敎育政策에 關한 硏究 : 初等敎育을 中心으로 Centering Around Primary School Education
윤희승 부산외국어대학교 교육대학원 1999 敎育論叢 Vol.- No.-
The「Imperialist」 educational policy was established during the period of a Japanese militaristic control of the 1910s as a basis for a colonial education. Under such colonial education, children of most workers were forced by the obscurantist policy to have no opportunity of leaning an a few allowed such opportunity were brought up by the 「 Imperialist」 policy as sub assistants to a colonial rule. Private schools were not allowed to expand their self-education and instead the were regulated to have the same curriculum as national and pubic schools did. The cultural control of the 1920s mixed violence and excursion, differently from militaristic control of the 1910s which depended only on violence. As a part of excursion, a reform of the school system was enforced by the New Education Ordinance enacted in 1992 according to the mainland expansionsim. The reform included the extension of the term of teaching by educational institutions, emphasis on Japanese(national) language education, location of primary schools at the lowest-level administrative districts on a one to one basis, and training by middle education of sub-assistants to Japanese colonial rule. These were not different with educational policies of the militaristic control period in the they were means to facilitate the colonial rule although having not an intensive but moderate quality. The 「Imperialist」Policy during the Period of a supply base of the 1930s had five main purposes of the clearness of national polity, the identification of Korea and Manchuria, educational promotion, the parallel advancement agriculture and industry and the purification of officialdom. For the. purposes, the 「Imperialist」 Policy was materialized as the enforcement of shrine worship for the identification of Korea and Japan, the enactment and enforcement of the oath by people under imperial control, the optionalization and actual abolition of Korean Language education, the enforcement of common use of Japanese language and the forced justification of Korea-Japan annexation through a distorted history education. Ultimately these were seeking toward the mobilization of Korean human resources, which were affluent next to Japanese main land under regions of the imperialist nation, to workplace and battle fields. In short, the history of Japanese colonial education in Korea was one of Japanesation by Korean people under the imperialist policy, or assimilation to Japan. It was also a thoroughly non-educational process which turned a deaf ear to the essential duty of education, a development of educational invasion and the enforcement of anti-educational situations. Japanese colonists divided the period of such colonial education into several phases, established a view of rationalizing non-educational qualities for each of the phases and applied the view to their colonial education policies. Of course, such colonial education policies were not always smoothly carried out with no resistance by Korean people. The Koreans resisted educational invasion by other ethnic people through the movement of saving education by the whole nation, the nationalism-oriented education and resistance to Japanese colonial education by private schools, and anti-Japanese movements by students.
정국삼,하동명,강민호,윤희승 한국산업안전학회 2000 한국안전학회지 Vol.15 No.3
The flash point is an important property and hazardous index of a flammable liquid. The flash points are used by virtually all the environmental, health, and safety organizations in both government and industry to classify flammable liquids for safety and transportation regulations. The basics of all flash points behavior are concerned with the vapor pressure and explosive limits. The flash points of pure components and the mixture of solvents can be calculated with the use of the laws of Raoult, Dalton and Le Chatelier. In this paper, experimentally determined lower flash points of a p-xylene and epoxy resin system were compared with the calculated values by using Raoults law. Calculated lower flash points were in reasonable agreement with the observed values.