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劉日煥(Il-Hwan Yoo) 한국철학회 2004 철학 Vol.78 No.-
禮에서의 方位는 禮 전체의 실천구조가 안정적으로 자리잡도록 규정한다. 參禮者 全體의 上下, 前後, 左右의 秩序에 따라 그 위치와 位階 나아가 權威를 나타내는 기준이 된다. 이런 점들은 동북아시아 전통 문화 전체에 적용되는 것으로, 특정 國家나 단체의 禮文化의 독자성 내지는 정체성을 나타내기도 한다 또한 이 연구의 결과를 바탕으로 古來의 각종 儀禮에 있어서 基幹으로 작용하는 右社左廟, 昭穆之序, 南東女西, 主東客西, 左虛, 左?ㆍ右? 등의 諸問題를 일관되게 검토할 수 있는 근거를 세우기 위한 目的도 있다. 古代 中國에서 禮의 方位에 관한 이런 광범위한 意識은 春秋時代에 본 괘도에 오르게 된다. 필자는 中國 禮學史에서 속에서 禮에서의 方位의 결정, 方位의 上下 등을 검토하고, 대체로 西周 初에서 戰國時代 中期에 이르는 尙左ㆍ尙右의 變遷問題를 일관되게 論究해보고자 하였다. 이 연구를 수행하기 위하여 『尙書』, 『左傳』, 『老子』 등의 古典을 중심으로 用例를 검토하였다.
CFD 시뮬레이션을 활용한 미세조류 배양용 버블 칼럼 광생물반응기 설계
유재인 ( J. -i. Yoo ),이인복 ( I. -b. Lee ),황현섭 ( H. -s. Hwang ),서일환 ( I. -h. Seo ),홍세운 ( S. -w. Hong ),( J. Bitog ),권경석 ( K. -s. Kwon ),최지선 ( J. -s. Choi ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
Photobioreactors (PBRs) that houses and cultivates microalgae providing a suitable environment for its growth, such as light, nutrients, CO2,heat, etc. is now getting more popular in the last decade. Among the many types of PBRs, the bubble column type is very attractive because of its simple construction and easy operation. However, despite the availability of these PBRs, only a few of them can be practically used for mass production. Many limitations still holdback their use especially during their scale-up. To enlarge their culture volume and productivity by supplying optimum environmental conditions, various PBR structures and processes for controlling are needed to be compared. In this study, computational fluid dynamics (CFD) was used to design a bubble-column type PBR to economically take the place of field experiments. CFD is a promising technique which can simulate the growth and production of microalgae in the PBR. To study bubble column PBR with CFD, the most important factor is the possibility of realizing bubble. In this study, multi-phase models which are generally used were compared by theoretical approaches and 2D preliminary simulations. As a result, the VOF (Volume of Fluid)model was found to be the most effective to realize the bubble shape and flow inside PBR which is made by bubble injection. Considering the accuracy and economical efficiency, 0.005 sec of time step size was chosen for 2.5 mm mesh size. With these initial conditions, 3-D PBR trial simulation and PIV (Particle Image Velocimetry) validation test were conducted. The verified CFD simulation model will be used as criteria for PBR scale-up research.
강제환기식 돈사의 환기 효율성 분석을 위한 CFD 모델 개발
서일환,이인복,홍세운,황현섭,유재인,권경석,하태환,김현태,Seo, Il-Hwan,Lee, In-Bok,Hong, Se-Woon,Hwang, Hyun-Seob,Bitog, Jessie Pascul,Yoo, Jae-In,Kwon, Kyung-Suk,Ha, Tae-Hwan,Kim, Hyeon-Tae 한국농공학회 2008 한국농공학회논문집 Vol.50 No.1
When livestock facilities in Korea have been changed larger and denser, rearing conditions have been getting worse and the productivity of animal production have been decreased. Especially in the cold season, the minimized ventilation has generally been operated to save energy cost in Korea resulting in very poor environmental condition and high mortality. While the stability, suitability, and uniformity of the rearing condition are the most important for high productivity, the ventilation configuration is the most important to improve the rearing condition seasonally. But, it is so difficult to analyze the internal air flow and the environmental factors by conducting only field experiment because the weather condition is very unpredictable and unstable as well as the structural specification can not be easily changed by the researchers considering cost and labor. Accordingly, an aerodynamic computer simulation was adopted to this study to overcome the weakness of conducting field experiment and study the aerodynamic itself. It has been supposed that the airflow is the main mechanism of heat, mass, and momentum transfers. To make the simulation model accurately and actually, simplified pig models were also developed. The accuracy of the CFD simulation model was enhanced by 4.4 % of errors compared with the data collected from field experiments. In this paper, using the verified CFD model, the CFD computed internal rearing condition of the mechanically ventilated pig house were analyzed quantitatively as well as qualitatively. Later, this developed model will be computed time-dependently to effectively analyze the seasonal ventilation efficiency more practically and extensively with tracer gas decay theory.
버블 칼럼 광생물반응기의 내부 유동분석을 위한 전산유체역학 시뮬레이션 모델의 이용
유재인,이인복,황현섭,홍세운,서일환,권경석,김용희,Yoo, J.I.,Lee, I.B.,Hwang, H.S.,Hong, S.W.,Seo, I.H.,Bitog, J.P.,Kwon, K.S.,Kim, Y.H. 한국농공학회 2009 한국농공학회논문집 Vol.51 No.5
Photobioreactor (PBR) that houses and cultivates microalgae providing a suitable environment for its growth, such as light, nutrients, CO2, heat, etc. is now getting more popular in the last decade. Among the many types of PBRs, the bubble column type is very attractive because of its simple construction and easy operation. However, despite the availability of these PBRs, only a few of them can be practically used for mass production. Many limitations still holdback their use especially during their scale-up. To enlarge the culture volume and productivity while supplying optimum environmental conditions, various PBR structures and process control are needed to be investigated. In this study, computational fluid dynamics (CFD) was economically used to design a bubble-column type PBR taking the place of field experiments. CFD is a promising technique which can simulate the growth and production of microalgae in the PBR. To study bubble column PBR with CFD, the most important factor is the possibility of realizing bubble. In this study, multi-phase models which are generally used to realize bubbles were compared by theoretical approaches and comparing in a 2D simulation. As a result, the VOF (volume of fluid) model was found to be the most effective model to realize the bubbles shape as well as the flow inside PBR which may be induced by bubble injection. Considering the accuracy and economical efficiency, 0.005 second time step size was chosen for 2.5 mm mesh size. These results will be used as criteria for scale-up in the PBR simulation.