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이대엽,Lee, Dae-Yeop 한국LP가스공업협회 2004 LP가스 Vol.16 No.4
지난 7월 21일 우운식 의원 주최로 국회도서관 대강당에서 열린 '대기오염저감을 위한 에너지상대가격체계 조개개편 토론회'에서 발제자로 나선 한국환경정책평가연구원 강만옥 연구의원, 환경정의 박용신 국장, 인하대 기계공학부 이대엽 교수의 발제 내용을 본지에 게재한다.
제조방법에 따른 Al<sub>2</sub>O<sub>3</sub>-SiC<sub>w</sub> 복합체의 특성
이대엽,윤당혁,Lee, Dae-Yeop,Yoon, Dang-Hyok 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5
$Al_2O_3$-SiC composites reinforced with SiC whisker ($SiC_w$) were fabricated using three different methods. In the first, $Al_2O_3-SiC_w$ starting materials were used. In the second, $Al_2O_3-SiC_w$-SiC particles ($SiC_p$) were used, which was intended to enhance the mechanical properties by $SiC_p$ reinforcement. In the third method, reaction-sintering was used with mullite-Al-C-$SiC_w$ starting materials. After hot-pressing at $1750^{\circ}C$ and 30 MPa for 1 h, the composites fabricated using $Al_2O_3-SiC_w$ and $Al_2O_3-SiC_w-SiC_p$ showed strong mechanical properties, by which the effects of reinforcement by $SiC_w$ and $SiC_p$ were confirmed. On the other hand, the mechanical properties of the composite fabricated by reaction-sintering were found to be inferior to those of the other $Al_2O_3$-SiC composites owing to its relatively lower density and the presence of ${\gamma}-Al_2O_3$ and ${\gamma}-Al_{2.67}O_4$. The greatest hardness and $K_{1C}$ were 20.37 GPa for the composite fabricated using $Al_2O_3-SiC_w$, and $4.9MPa{\cdot}m^{1/2}$ using $Al_2O_3-SiC_w-SiC_p$, respectively, which were much improved over those from the monolithic $Al_2O_3$.
전지용(Ji Yong Jeon),이해수(Hae Soo Lee),김태민(Tae Min Kim),이대엽(Dae Yeop Lee) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Three way catalyst(TWC) can reduce emission in LPG engine exhaust without complex constructions. When old vehicle"s TWC was driven long odometer or worn out, it will cause deterioration of conversion efficiency. But replacing an old vehicle"s catalytic convertor are still problem too high cost. In this research, the TWC effect for exhaust gas reduction efficiency over low precious metal catalyst was tested as CVS-75 mode.
정소영,강해란,유한준,최형,허효진,차병선,이소민,여혜림,강서정,이대엽,곽병문,이미기,빈범호,Jung, So Young,Kang, Hae-Ran,Yoo, Han Jun,Choi, Hyeong,Heo, Hyojin,Cha, Byungsun,Brito, Sofia,Lee, So Min,Yeo, Hye Lim,Kang, Seo Jeong,Lee, Dae Yeop 대한화장품학회 2021 대한화장품학회지 Vol.47 No.3
나노입자(nanoparticles)는 그 크기가 피부를 구성하는 세포보다 작다. 따라서 세포막을 통과하고 약물 또는 유전자를 전달하는 매개체로서의 역할에 매우 적합하며 특정 성분을 피부 속에 전달할 수도 있다. 본 연구에서는 쑥으로부터 나노입자를 추출하여 dynamic light scattering (DLS)를 통해 100 nm 전후 크기의 입자를 얻었음을 확인하였고, MTT assay를 통하여 섬유아세포에서 cell viability를 농도 의존적으로 증진시키는 결과를 얻었다. 또한, quantitative real time PCR 분석법을 통해서 COL1A1 mRNA 발현량을 증가시키고 IL-6 mRNA 발현량은 감소시킴을 확인하였다. 세포실험뿐 아니라 화장품 제형에서도 적용 가능하며, 안정함을 확인하였다. 최근 화장품 산업 동향에서 화학 성분을 배제하고 식물 유래 성분 수요가 지속적으로 높아지고 있는 반면, 식물에서 유래된 나노입자의 응용분야를 제시하는 연구 결과가 거의 없다는 한계가 있다. 따라서 현시점에서의 화장품 산업의 한계점을 극복하고자 본 연구를 통해 얻은 결과를 견주어 쑥으로부터 유래된 나노입자를 고기능성 화장품 소재로서 제시하고자 한다. Nanoparticles are substances that are smaller in size and smaller than cells that make up the skin. Therefore, they are very suitable as mediators for transmitting drugs or genes across cell membranes, and also deliver specific ingredients into the skin.In this study, nanoparticles were extracted from mugwort and particles of around 100 nm were obtained through dynamic light scattering (DLS), and the results of concentration-dependent enhancement of cell viability in fibroblasts were obtained through MTT assay. In addition, it was confirmed that the COL1A1 mRNA expression level was increased and the IL-6 mRNA expression level was decreased through the quantitative real-time PCR analysis method. Moreover, as these nanoparticles were confirmed to be stable, they can be applied not only to cell experiments but also to cosmetic formulations. While the demand for plant-derived ingredients continues to increase, excluding chemical ingredients from the recent cosmetics industry trend, there is a limitation in that there are few research results suggesting the application field of plant-derived nanoparticles. Therefore, in order to overcome the limitations of the cosmetic industry at the present time, the results obtained in this study present nanoparticles derived from Artemisia princeps (NDAP) as a highly functional cosmetic material.
대형차대 및 엔진동력계에서의 시험모드에 따른 배출가스 특성 비교 연구
전상우(Sang-woo Jeon),업동섭(Dong-seop Eom),김종춘(Jong-choon Kim),박용희(Yong-hee Park),권상일(Sang-il Kwon),이대엽(Dae-yeop Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In worldwide, emission certification tests of heavy-duty vehicles are performed on engine dynamometer. However, it must uninstall engines and can't reflect on actual driving characteristics. On the other hand, chassis dynamometer can perform the testing without time and cost of un installing engines, and simulate actual driving patterns of vehicle on road. In this study, exhaust emissions of urban of going presently round bus was measured on heavy-duty chassis dynamometer. And for review of the results on chassis dynamometer, engine test results on engine dynamometer were compared and analyzed.