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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.
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.
유용진,박민철 大韓神經精神醫學會 1995 신경정신의학 Vol.34 No.1
This study was performed to evaluated the parental rearing attitude and its relation to the severity of schizophrenic disorder and the anxiety of the subjects. The subjects were 154 schizophrenic patients by DSM-Ⅲ-R who were admitted to the Wonkwang University Hospital from June 15, 1993 to September 30. 1993. The parental bonding instrument-Korean version(PBI) and the self-rating anxiety scale were used for evaluating the characteristics of the parental rearing attitude and the anxiety of the schizophrenics and their parents as well as normal persons. The results were as follows : 1) The characteristics of the parental rearing attitude perceived by schizophrenics were significantly higher on protection and lower on care than those perceived by normals on PBI(p〈.01). 2) The mothers were perceived as more caring and somewhat more protective than the father in both schizophrenic and normal groups(p〈.01). 3) The mean duration of admission was related to the parental rearing attitude(p〈.05), but this relationship was not found in the other clinical characteristics indicating the severity of disorder. 4) Schizophrenic group rated significantly high in self-rating anxiety scale compared with normal group(p〈.01). 5) The levels of anxiety were the highest in those who perceived their parental figures as lower on care and higher on protection and the lowest in those who perceived them as higher on care and lower on protection. In summary schizophrenics were significantly higher on protection and lower on care which were rated by PBI and high scores in self-rating anxiety scale compared with normal group.