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오스테나이트 결정립 크기를 고려한 CGHAZ에서의 상변태 거동 예측
이찬우,엄상호,이경종,이창희 대한용접접합학회 2000 대한용접·접합학회지 Vol.18 No.5
A metallurgical model for the phase transformation kinetics at Coarsened Grain Heat Affected Zone(CGHAZ) on the basis of Johnson-Mehl-Avrami equation(JMA equation) was proposed. In this model, the effect of prior austenite grain size on the transformation and the morphological changes of ferrite were considered. Isothermal dilatometer tests were performed to determine the effect of prior austenite grain size (AGS) on the austenite decomposition to ferrite and pearlite in a plain carbon steel. By comparing the calculated volume fraction with measured data, the reliability of the developed model was discussed.
이찬우,김미운 대한마취통증의학회 2017 Korean Journal of Anesthesiology Vol.70 No.1
Background: Dexmedetomidine is an alpha-2 adrenergic agonist with sedative, anxiolytic, and analgesic properties. This study was designed to evaluate the inhibitory effects of preoperative administration of 0.5 μg/kg dexmedetomidine on hemodynamic responses caused by endotracheal intubation in elderly patients undergoing treatment for hypertension. Methods: Forty elderly (≥ 65 years old) patients who had been receiving hypertension treatment, had American Society of Anesthesiologists physical status II, and were scheduled to undergo elective noncardiac surgery were randomly selected and assigned to 2 groups. Group C received normal saline and group D received 0.5 μg/kg dexmedetomidine intravenously over 10 min just before endotracheal intubation. Systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), and heart rate (HR) were recorded preoperatively in the ward, immediately after study drug administration, and at 1, 3, and 5 min after endotracheal intubation. Results: Compared to group C, group D showed significantly lower SBP and MAP at 1, 3, and 5 min as well as significantly lower DBP and HR at 3 and 5 min after endotracheal intubation. Conclusions: In elderly patients receiving hypertension treatment, a single preanesthetic dose of dexmedetomidine (0.5 μg/kg) effectively suppressed the hemodynamic responses to endotracheal intubation.
이찬우 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.5
Various biodegradable polymers (PLLA-PEG-PLLA, PLLA-PPG-PLLA, PLLA-PN-PLLA) were synthesized and their affinities with cells were measured. Cell migration rate was more dependent on the cell density rather than on the characteristics of polymer. PLLA-PN-PLLA film showed formation of cohesive cell structure. The contact angle of this film was almost the same as that of PLLA. However, initial number of cell attachment of PLLA film was 3 to 4 times higher than that of PLLA-PN-PLLA copolymer film.