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Cho Jeong Hun,Hong Yong Deog,Kim Donghyun,Park Si Jun,Kim Jung Soo,Kim Hyun-Min,Yoon Eun Jeong,Cho Jin-Seong 한국응용생명화학회 2022 Applied Biological Chemistry (Appl Biol Chem) Vol.65 No.1
Plant exosomes are nanosized (30–150 nm) membrane vesicles that contain biomolecules and influence the development of a plant and protect the plant from pathogens. Recently, plant exosomes are in the spotlight as a new biologically active substance. However, whether plant exosomes have similar efficacy to conventional secondary metabolites of plants is unknown. In this study, the difference in efficacy between plant exosomes and conventional secondary metabolites was analyzed with three or four types of plant extracts, including ginseng ( Panax ginseng ) and green tea ( Camellia sinensis ). After 6 h of treatment, the analysis of gene expression pattern of each sample showed that the exosome treatment group and the extract treatment group were clearly distinguished. After selecting the genes that showed differential expression of > twofold change, the number of genes that were up- or downregulated appeared to be 398 or 438 for the extract and 861 or 648 for the exosome, on average. This suggests that the change in transcriptome is more expressed in the exosome treatment group than in the extract treatment group. In addition, in the comparative analysis of expression of genes that are known to affect aging, regeneration, skin barrier, and moisturization— MMP12 , MMP13 , NOTCH3 , FGF12 , HS3ST3A1 , LOX , VIM , ELOVL3 , and KRTI —the exosome treatment group was predicted to more effectively contribute to maintaining a healthy skin when compared to the extract treatment group. The number of genes that were identified to specifically react to the Panax ginseng or Camellia sinensis treatment group during the transcriptome change phase was 11 and 8, respectively. This suggests that exosomes bear its specific effect according to the plant it is derived from. In conclusion, the results of this study indicate that plant exosomes, as natural biologically active substances, have different effects from conventional plant extracts, and have the potential to be commercialized as a cosmeceutical product.
교육시설의 개선 방향에 관한 연구-대구시 초등학교의 도서실 및 미디어 관련시설의 면적 구성에 관하여-
조동현(Cho. Donghyun),김교준(Kim. Kyojoon),이상홍(Lee. Sanghong) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The current school library and related media facilities are not enough to take their own role for the 7th curriculum that try to match with theses technology and information world. This study propose the direction of future media center that the information world demands for and maximum efficiency of space. Thorough the area composition of the existing library and related facilities. The sample schools were chosen as standard schools which of number is below 2000 people above 800 people in the city of Daegu which is metropolis except the capital region.<br/> Planning library and media relation facilities, we should consider requirement of the user in the information world for the area composition and ratio.
조동현(Cho Donghyun),이상홍(Lee Sanghong),홍원화(Hong Wonhwa) 한국주거학회 2004 한국주거학회 논문집 Vol.15 No.6
This study proposes the direction of planning and designing for the media related facilities through the future concepts of media-center even though the concept and environment of the media-center are developed mealy at elementary schools in Korea. This study investigates and analyzes whether the present facilities are ready for the efficient education and improved facilities through comparison between after and before the 7th education program of systems of the academic support facilities. Therefore this study proposes the direction of developing and designing media-center through the field survey, make-up questionaries and analyzing architectural drawings of media related facilities for the future.
유동층 반응기를 이용한 열 플라즈마-촉매 반응기에서 CF₄ 제거 성능 평가
조동현(Donghyun Cho),조성권(Sungkwon Jo),이대훈(Dae Hoon Lee),강우석(Woo Seok Kang) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
As part of the development of a scrubber for the removal of warming gases generated in semiconductor and display industries, an evaluation of CF₄ removal was conducted by using a thermal plasma-catalysis reactor that applied with a fluidized bed. The fluidized bed can stabilize the temperature of the catalyst bed due to its high heat transfer characteristic and minimize the effect of particle impurities generated in the semiconductor and display processes. CF₄ was used as a reactant gas, and the removal rate and design factors of the thermal plasma-catalysis reactor were confirmed through experiments. As a result, the fluidized bed reactor can secure high temperature uniformity without hot spots compared to the fixed bed catalytic reactor. The CF₄ removal rate is affected by the space velocity of the catalyst, and it was possible to secure up to 95% or more. In addition, main elements for designing the thermal plasma-catalysis reactor and directions for performance improvement were presented.
CF₄ 제거를 위한 유동층 반응기를 이용한 열 플라즈마-촉매 스크러버 특성 연구
조동현(Donghyun Cho),조성권(Sungkwon Jo),강홍재(Hongjae Kang),강우석(Woo Seok Kang) 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.1
지구온난화에 따른 기후 문제가 심각해지는 반면, 세계적인 반도체 수요 증가로, 온실가스인 과불화화합물 사용량이 증가하고 있다. 특히, 높은 열분해 온도를 갖는 CF₄ 제거를 위해 많은 에너지를 소모하고 있다. 에너지 효율이 높은 스크러버 기술 개발을 위해 열 플라즈마-촉매 조합에 대한 연구를 수행하였으며, CF₄ 제거 특성 및 에너지 효율을 분석하였다. 플라즈마 열의 집중에 따른 부작용을 최소화하기 위해 유동층 촉매 반응기를 적용한 새로운 열 플라즈마-촉매 반응기를 적용하였으며, 고정층 촉매반응기와의 CF₄ 분해 성능 및 온도 분포를 비교하였다. 그 결과, 높은 온도 균일성 및 95%의 CF₄ 분해율을 확인하였다. 또한, 기존 플라즈마 단독 스크러버 대비 약 2.5배 이상 에너지 효율을 확보할 수 있었다. 본 연구의 결과는 열 플라즈마-촉매 방식의 고효율 스크러버 개발에 기여할 것 기대한다. To develop a scrubber technology with high energy efficiency, a study was conducted on a thermal plasma-catalysis combination in which carbon tetrafluoride (CF₄) removal characteristics and energy efficiency were analyzed. To minimize the side effects caused by the concentration of the plasma heat, a new thermal plasma-catalysis reactor equipped with a fluidized bed was applied. The CF₄ decomposition and temperature distribution were compared with that of a fixed bed. As a result, high uniformity of temperatures and CF₄ decomposition of 95% were confirmed. In addition, it was possible to secure about 2.5 times or greater energy efficiency compared to the existing scrubber containing only plasma. The results of this study are expected to contribute to the development of an energy-efficient scrubber using a thermal plasma-catalysis.