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Caenorhabditis elegans를 이용한 phenol류의 독성 연구
정강식,현선희,정세영,Jung Kang-Sik,Hyun Sun-Hee,Choung Se-Young 환경독성보건학회 2006 환경독성보건학회지 Vol.21 No.3
Caenorhabditis elegans(C. elegans) is a free-living soil nematode that commonly used as a biological model and recently, much work has been done using C. elegans as a toxicity model. To evaluate the acute toxicity of phenols to C. elegans, worms were subsequently exposed to nine different xenobiotics. This study described lethal toxicity, reproductive toxicity and movement inhibition using 2-propylphenol, 4-propylphenol, 2-tert-butylphenol, 3-tert-butylphenol, 4-tert-butylphenol, 2-phenylphenol, 4-phenylphenol, nonylphenol and 4-dodecylphenol to C. elegans for 24 hr or 72 hr. We found that phenols used in this study were very toxic to C. elegans. The order of lethal toxicity, reproductive toxicity and movement inhibition is as follows. 4-propylphenol > 2-phenylphenol > 2-tert-butylphenol > 2-propylphenol > nonylphenol > B-tert-butylphenol > 4-dodefylphenol > 4-tert-butylphenol > 4-phenylphenol.
정강식(Jung, Kang-Sik),문승재(Moon, Seung-Jae),유홍희(Yoo, Hong-Hee) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.9
Static and dynamic responses of micro cantilever beam structures undertaking electrostatic forces are obtained employing Galerkin's method based on Euler beam theory. Variations of static and dynamic responses as well as resonant frequencies are estimated for several sets of beam properties and applied voltages. It is shown that the applied voltage influences the deflection and the modal characteristics significantly. Such information can be usefully employed for the design of MEMS structures.
정전기력을 받는 마이크로 이중 외팔 보의 응답 및 모드 해석
정강식(Jung, Kang-Sik),문승재(Moon, Seung-Jae),유홍희(Yoo, Hong-Hee) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.2
The governing equations of micro double cantilever beam structures interacted by electrostatic forces are obtained employing Galerkin's method based on Euler beam theory. Variations of static and dynamic responses as well as natural frequencies are estimated for applied voltages. In particular, it is investigated how the variations of beam properties resulted by manufacturing process influence the deflections and the modal characteristics. This study can help to design MEMS structures and to predict the performances with respect to manufacturing tolerances.
정강식(Kang-Sik Jung),유홍희(Hong-Hee Yoo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The effects of two important numerical procedures on the high precision structural analysis are investigated in this study. The two numerical procedures include continuous variable approximation and time integration. For the continuous variable approximation, polynomial mode functions generated by the Gram-Schmidt process are introduced and the numerical results obtained by employing the polynomial mode functions are compared to those obtained by classical beam mode functions. The effect of the time integration procedure on the analysis precision is also investigated. It is found that the two procedures affect the precision of structural analysis significantly.