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이경천,김지영,곽현정,Hee-Dong Lee,Il Won Kwon 대한마취통증의학회 2011 Korean Journal of Anesthesiology Vol.61 No.4
Background: Carbon dioxide (CO_2) has different biophysical properties under different thermal conditions,which may affect its rate of absorption in the blood and the related adverse events. The present study was aimed to investigate the effects of heating of CO_2 on acid-base balance using Stewart’s physiochemical approach, and body temperature during laparoscopy. Methods: Thirty adult patients undergoing laparoscopic major abdominal surgery were randomized to receive either room temperature CO_2 (control group, n = 15) or heated CO_2 (heated group, n = 15). The acid-base parameters were measured 10 min after the induction of anesthesia (T_1), 40 min after pneumoperitoneum (T_2), at the end of surgery (T_3) and 1 h after surgery (T_4). Body temperature was measured at 15-min intervals until the end of the surgery. Results: There were no significant differences in pH, PaCO_2, the apparent strong ion difference, the strong ion gap,bicarbonate ion, or lactate between two groups throughout the whole investigation period. At T_2, pH was decreased whereas PaCO_2 was increased in both groups compared with T_1 but these changes were not significantly different. Body temperatures in the heated group were significantly higher than those in the control group from 30 to 90 min after pneumoperitoneum. Conclusions: The heating of insufflating CO_2 did not affect changes in the acid-base status and PaCO_2 in patients undergoing laparoscopic abdominal surgery when the ventilator was set to maintain constant end-tidal CO_2. However, the heated CO_2 reduced the decrease in the core body temperature 30 min after the pneumoperitoneum.
저온동시소성세라믹 기판 위에 제작된 PZT 박막의 증착조건이 박막의 구조적 특성에 미치는 영향
이경천,황현석,이태용,허원영,송준태,Lee, Kyung-Chun,Hwang, Hyun-Suk,Lee, Tae-Yong,Hur, Won-Young,Song, Joon-Tae 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.4
Recently, low temperature co-fired ceramic (LTCC) technology is widely used in sensors, actuators and microsystems fields because of its very good electrical and mechanical properties, high reliability and stability as well as possibility of making 3D micro structures. In this study, we investigated the effects of sputtering gas ratio and annealing temperature on the crystal structure of $Pb(ZrTi)O_3$ (PZT) thin films deposited on LTCC substrate. The LTCC substrate with thickness of $400\;{\mu}m$ were fabricated by laminating 4 green tapes which consist of alumina and glass particle in an organic binder. The PZT thin films were deposited on Pt / Ti / LTCC substrates by RF magnetron sputtering method. The results showed that the crystallization of the films were enhanced as increasing $O_2$ mixing ratio. At about 25% $O_2$ mixing ratio, was well crystallized in the perovskite structure. PZT thin films was annealed at various temperatures. When the annealing temperature is lower, the PZT thin films become a phyrochlore phase. However, when the annealing temperature is higher than $600^{\circ}C$, the PZT thin films become a perovskite phase. At the annealing temperature of $700^{\circ}C$, perovskite PZT thin films with good quality structure was obtained.
이경천(Kyung-Cheon Lee),김낙영(Nag-Young Kim) 한국토목섬유학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.4
The Geocell system is the advanced system of Geo-grids, and is one of geosynthetics used for earth reinforcement of construction structure on weak soil. It is the way to increase earth strength and bearing capacity by using three dimension type of geo-composite. This paper analyzed the bearing capacity mechanism of Geocell system for earth reinforcement. Plate loading test using laboratory model study was performed, and bearing capacity increase and subsidence decrease of shallow foundation were evaluated.
O<sub>2</sub> 플라즈마로 처리한 폴리머 기판 위에 성장된 GZOB 박막의 특성
유현규,이종환,이태용,허원영,이경천,신현창,송준태,Yu, Hyun-Kyu,Lee, Jong-Hwan,Lee, Tae-Yong,Hur, Won-Young,Lee, Kyung-Chun,Shin, Hyun-Chang,Song, Joon-Tae 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.8
We investigated the effects of a high density $O_2$ plasma treatment on the structural and electrical properties of Ga-, B- codoped ZnO (GZOB) films. The GZOB films were deposited on polymer substrate without substrate heating by DC magnetron sputtering. Prior to the GZOB film growth, we treated a polymer substrate with highly dense inductively coupled oxygen plasma. The optical transmittance of the GZOB film, about 80 %, was maintained regardless of the plasma pre-treatment. The resistivity of the GZOB film on PC substrate decreased from 9.08 ${\times}$ $10^{-3}$ ${\Omega}-cm$ without an $O_2$ plasma pre-treatment to 2.12 ${\times}$ $10^{-3}$ ${\Omega}-cm$ with an $O_2$ plasma pre-treatment. And PES substrate decreased from 1.14 ${\times}$ $10^{-2}$ ${\Omega}-cm$ without an $O_2$ plasma pre-treatment to 6.13 ${\times}$ $10^{-3}$ ${\Omega}-cm$ with an $O_2$ plasma pre-treatment.