광유계 윤활기유의 이해

유용진,Yu, Yong-Jin 대한석유협회 1992 석유와 에너지 Vol.1992 No.6

폐자원을 활용한 내장용 인조석재의 물리적 특성

유용진,이상수,송하영 한국건축시공학회 2014 한국건축시공학회지 Vol.14 No.3

The environmental problem is serious due to global warming In a concrete industry, the effort to reduce the problemof the destruction of environment arising from the indiscriminate use of limestone that is the raw material of cementand aggregate and the exhaustion of resources are continually emphasized In this research, the waste porcelain andwaste glass that are the natural aggregate substitute materials were mixed and were applied. In addition, the magnesiaphosphate composite and fly ash are mixed with a cement substitute material and the properties of the artificial stonewas examined. Density, water absorption, rate of aggregate on the surface, compressive strength, and flexural strengthwere performed. As a result of the test, it is that waste glass with 60% and waste porcelain with 70% are the mostexcellent mix to produce the artificial stone. 지구온난화 현상으로 인해 환경 문제가 심각하며, 또한, 시멘트의 원료인 석회석과 골재의 무분별한 채취로 인한 환경파괴와 자원고갈의 심각성이 강조되고 있는 상황에서 문제점을 줄이려는 노력이 지속되고 있는 실정이다. 따라서, 본 연구에서는 천연골재 대체재인 폐자기를 혼합하여 적용시켰다. 또한, 시멘트 대체재로써 마그네시아 인산염 복합체와 플라이애시를 혼입하여 그에 따른 인조석재의 특성을 알아보고자 한다. 실험결과, 폐유리 혼합비율24360% 및 폐자기 혼합비율 70%가 인조석재의 전반적인 실험에서 가장 우수한 것으로 판단되며, 인조석재의 기초적인 자료로 활용할 수 있을 것으로 기대된다.

LED 광원에 따른 미세조류 Scenedesmus obliquus의 성장 특성

유용진,김송이,이건우,이영복,김진우,김호섭 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.11

Microalgae are independent organisms that perform photosynthesis and can alter the culture environment to increase accumulation of useful substances derived from microalgae. In this study, cell growth was measured by incubation for 39 days using MBBM, Neo medium, and seven light sources, which is the main factor affecting cell growth of microalgae S. obliquus. In the case of S. oliquus, which grew in MBBM and Neo medium, cell growth was highest under fluorescent light sources and Red2 LED (R660) light sources, and cell growth was lowest under Infra Red LED (R741) light sources. The average cell growth rate was 17.7% for MBBM and 15.4% for Neo. Comparing the effects of dry cell weight of Neo medium containing nutrients on the production of aquatic plants, MBBM and dry cell weight of Neo resulted in higher cell growth than Neo medium under all LED light sources except for Blue LED (B450). This proves that MBBM is more suitable for increasing the cell growth of microalgae than Neo medium and confirms that light source selection is important in the production of useful materials through mass cultivation of microalgae in the future. 미세조류는 광합성을 수행하는 독립영양생물로 배양 환경을 변화시켜 미세조류 유래 유용물질의 축적을 증대시킬 수 있다. 본 연구에서는 미세조류 S. obliquus의 세포 성장에 주요 인자인 배지와 광원의 영향을 평가하기 위해 MBBM, Neo 배지와 7가지의 광원을 사용하여 39일 동안 배양하여 세포 성장을 측정하였다. 그 결과 MBBM과 Neo 배지에서 성장한 S. obliquus의 경우, Fluorescent light 광원과 Red2 LED (R660) 광원에서 세포 성장이 가장 높게 관찰되었고, Infra Red LED (R741) 광원에서는 세포 성장이 가장 낮게 관찰되었다. 평균 세포 성장률은 MBBM 배지에서 17.7 %, Neo 배지에서 15.4 %의 성장률을 확인하였다. MBBM과 수생식물 생산용 영양소를 포함한 Neo 배지의 건조세포무게(dry cell weight)를 비교하였을 때, Blue LED (B450)를 제외한 LED 광원에서 Neo보다 많은 세포 성장이 높은 것이 확인되었다. 이는, MBBM 배지가 Neo 배지보다 미세조류 세포량 증대에 보다 적합함이 증명되어 향후 미세조류 대량배양을 통한 유용물질 생산에 있어 광원 선정이 중요하다는 것이 확인되었다.

정신분열병에서 지능지수에 따른 임상 양상과 지능의 특징

유용진,이귀행,권석준,최성호 圓光大學校 醫科學硏究所 2004 圓光醫科學 Vol.19 No.2

Development of guidewire sensor packaging for diagnosis of acute myocardial infarction

유용진,박우태 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.7

폐자원을 활용한 인조석재의 물리적 특성

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%.

태권도 이벤트 브랜드자산 요소가 브랜드 충성도에 미치는 영향

유용진(You Yong-Jin),김태일(Kim Tae-Il),권오성(Kwon O-Seong) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.3

The purpose of this study is the effect of brand equity factors on brand loyalty of Taekwondo events, and hypothetical models, then after, I examined the cause-effect relationship between variables through means of structural equation model. The subjects of this survey were audience of Taekwondo tournament, and 400 participants were sampled by using convenience sampling. 324 participants completed the survey and their responses were actually used in the analysis. Questionnaires returned from 76 respondents had to be dropped from the analysis, because their responses were judged insincere or were not filled in the questionnaires completely. Analytical techniques used in this research work were frequency analysis, t-test, one-way ANOVA, post-hoc analysis using a Scheffe's test, correlation analysis, and regression analysis. Results from the above survey and analysis of data and information revealed the following: First, there were significant differences in brand awareness according to individual characteristics in terms of gender; brand personality according to individual characteristics in terms of gender, age, level of education, monthly income; and brand image according to individual characteristics in terms of gender, age, level of education. second, there were significant differences in brand loyalty according to individual characteristics in terms of level of education, monthly income. Third, the results from regression analysis of brand equity factors and brand loyalty revealed that brand awareness and brand image, which were the sub-variables of brand loyalty, had significant effects on brand equity factors.

폐자원을 활용한 인조석재의 촉진내후특성

유용진(Yoo, Yong Jin),이상수(Lee, Sang Soo),송하영(Song, Ha Young) 한국콘크리트학회 2015 한국콘크리트학회 학술대회 논문집 Vol.2015 No.5

폐자원(폐자기+폐유리)를 사용한 인조석재의 내마모성 및 휨강도특성

유용진(Yoo, Yong-Jin),이상수(Lee, Sang-Soo),송하영(Song, Ha-Young) 대한건축학회 2014 대한건축학회 학술발표대회 논문집 Vol.34 No.2

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.