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라만 분광법을 이용한 지질생산 미세조류 Scenedesmus obliquus 성장 평가
유용진(Yong Jin Yoo),이건우(Geon Woo Lee),백동현(Dong Hyun Baek),김진우(Jin-Woo Kim),김호섭(Ho Seob Kim) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.5
최근 3세대 바이오매스라고 알려진 미세조류를 이용하여 생산되는 바이오디젤은 기존의 교통수단에 사용되는 화석연료를 대체할 수 있는 유일한 재생에너지로 알려져 있다. 미세조류 중에서도 Scenedesmus obliquus 는 다른 미세조류 대비 성장이 빠르고 건조세포무게 대비 지질을 40-50 % 축적이 가능하여 바이오디젤 생산에 있어 야외 및 대규모 재배에 적합한 지질생산 우수 종으로 알려져 있다. 미세조류를 이용한 바이오디젤 생산을 위해서는 높은 바이오매스 생산량 확보가 선행되어야 하며 배양공정의 제어를 위해 효과적인 세포 질량 측정 및 분석이 필요하다. 본 연구는 S. obliquus 를 75일 동안 배양하며 흡광도, 현미경 이미지, 라만 분광법 등으로 미세조류의 성장 변화를 측정하고, 측정된 값들에 대한 상관관계를 관찰하였다. 배양 60일과 배양 75일 기간에, 흡광도의 변화량이 3 % 미만인 반면, 현미경으로 관찰한 미세조류의 숫자는 3배 이상 증가하였다. 또한, 라만 분광법으로 측정된 결과에서는 β-카로틴에 해당하는 997 cm<SUP>-1</SUP>, 1148 cm<SUP>-1</SUP>, 1515 cm<SUP>-1</SUP>의 강한 피크값이 측정되었으며, 배양 기간 동안 β-카로틴의 피크값은 초기보다 3배 이상 증가하는 것이 관찰되었다. 따라서 라만 분광법을 이용하면 미세조류 배양에서 세포 내 성장 물질과 성장 정도를 알아내어 높은 바이오매스를 생산할 수 있을 것이다. Biodiesel produced using microorganisms, which are recognized as the third-generation biomass, is among the various known renewable energy sources that can replace fossil fuels used in conventional transportation. Scenedesmus obliquus has been identified as an excellent species for biodiesel production, as it grows faster and can accumulate up to 40-50 percent of the dry cell weight. Enhancing production using S. obliquus requires measuring the cell mass for controlling the cultivation process. In the current study, S. obliquus was cultured for 75 days, and growth changes of the microalgae were measured by absorbance, microscopic imaging, and Raman spectroscopy. Between days 60 to 75 of culture, the change in absorbance was observed to be less than 3%, whereas the number of microalgae observed microscopically was more than three times higher. Moreover, the Raman spectroscopy results showed three strong peak values of β-carotene at 997 cm<SUP>-1</SUP>, 1148 cm<SUP>-1</SUP>, and 1515 cm<SUP>-1</SUP>, with peak values of β-carotene showing greater than 3-fold increase during the culture period. Therefore, we predict that application of Raman spectroscopy will help in identifying the growth elements and growth degree in microalgae culture during increased biomass production.
유용진(Yoo, Yong-Jin),이상수(Lee, Sang-Soo),송하영(Song, Ha-Young) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.5
Recently, the enviroment problem is serious due to the global warming phenomenon because of the greenhouse gas exhaustion. And it is the situation where the severity of the destruction of environment because of the indiscriminate picking of the,that is the raw material of the cement, limestone and aggregate and exhaustion of resource are emphasized. In addition, thus the cement reduction amount of use and substitute material research is the urgent actual condition with the gas emission, which here it is generated in conducting compression molding in the building stone manufacturing process performance degradation phenomenon and fire resistance, and problem of the durability. The ratio of the waste resources (the waste glass and waste porcelain) about the total volume select as 50, 60, 70, 80 (%) etc. and try to look into the characteristic of the artificial stone according to it at this research. and the subject for examination according to it is the flexural strength, compressive strength, specific gravity (density), water absorption, rate of aggergate on the surface etc. It was considered in the exterior material standard criteria to be reasonable. And. It was exposed to be the most superior in case of the waste Porcelain mixing ratio 70%, waste glass mixing ratio 70%, and waste glass + waste Porcelain 80%.
폐자기와 3성분계 무기결합재의 혼합비율 변화에 따른 인조석재의 역학적 특성
유용진 ( Yong Jin Yoo ),배상우 ( Sang Woo Bae ),이상수 ( Sang Soo Lee ),송하영 ( Ha Young Song ) 한국건축시공학회 2012 한국건축시공학회 학술발표대회 논문집 Vol.12 No.2
This study makes with the environment-friendly artificial stone which doesn`t use the cement and natural aggregate and increases the blast furnace slag that is the eco-friendly material that is the industrial byproduct, fly ash, and availability of the red mud and applies the coares aggregate substitute material as the cleistothecium. The experimental plan according to it indicated the compressive strength and flexural strength which is the most excellent in the mixied ratio 40% of the result degree of closeness magnetism of experimenting with the optimal mix obtained through the preceding stude.
라돈가스 저감을 위한 흡착재를 사용한 친환경 모르타르의 특성
오서명(O, Seo-Myeong),유용진(Yoo, Yong-Jin),이상수(Lee, Sang-Soo) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.7
The radon is the element of the radioactive series as the environmental pollutant existing everywhere with the nature and living space. In case of the radon more than the medical standard was drunk with the gaseous substance naturally generated in the space in which the person lives or breathing by causing the respiratory disease, including the fatal lung cancer, it is known. As to the Radon gas, is reported and that great deal of radon is mainly emitted to the room from the soil, subsurface water, and construction material particularly the what is relatively high thing including the granite gypsum board, yellow soil, and etc. is generated. In addition, it showed that concentration of the Radon gas was high in the house built with the concrete and the concentration which is higher in the house in which the mortar is used as the outer wall finish was detected and the construction material choice became the important factor reducing the Radon gas generation. By applying the adsorbent in which the adsorption performance and purification performance is excellent to the moat tar, this research tries to study the application plan of the environment-friendly mortar in order to reduce the problem including the inner climate polution, harmful material and Radon gas exhaustion, and etc.