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임상연구 : 대장 절제술에서 수술 중 N-acetyl-cysteine의 투여가 수술 후 회복 시간에 미치는 영향
하인호 ( In Ho Ha ),곽경화 ( Kyung Hwa Kwak ),한창규 ( Chang Gyu Han ),이인택 ( In Taek Lee ),최규석 ( Gyu Seog Choi ),김인겸 ( In Kyeom Kim ),백운이 ( Woon Yi Baek ),임동건 ( Dong Gun Lim ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.4
Background: The gut is an important area for inflammatory responses. Gut manipulation during open laparotomy compared with laparoscopic surgery, increases the inflammatory responses. Laparoscopic assisted colectomy (LC) with less bowel manipulation might minimize the inflammatory responses and oxidative stress, and offer a faster postanesthetic recovery than an open colectomy (OC). This study evaluated the effect of N-acetyl-cysteine (NAC), an antioxidant, on the recovery after colectomy. Methods: 116 colorectal tumor patients were reviewed retrospectively. The patients were divided into 3 groups; LC by surgeon A (A-L), OC by surgeon A (A-O) and OC by surgeon B (B-O). The postanesthetic recovery scores (PARS) were compared. In the prospective randomized controlled trial, the colorectal tumor patients were assigned to one of four groups; laparoscopic assisted colectomy (L - N) with NAC infusion (L + N), open colectomy (O-N) with NAC infusion (O + N). In the NAC groups, NAC (5 mg/kg/h) was infused after intubation to extubation. The PARS were compared. Results: In the retrospective study, the time to reach 10 points, which satisfies the discharge criteria in the PACU, was significantly lower in the A-L group than in the other groups. In the prospective study, the time to 10 points was shorter in the O + N group than in the O-N group. NAC offered no added benefits to the L + N and L-N groups. Conclusions: NAC offered faster recovery in the OC group but not in the LC group. (Korean J Anesthesiol 2006; 51: 436~42)
Kim, Jin Ho,Jung, Jae Mok,Kwak, Jun Young,Hong, Seung-Soo,Gal, Yeong-Soon,Lim, Kwon Taek American Scientific Publishers 2012 Journal of nanoscience and nanotechnology Vol.12 No.5
<P>Graphene oxide films were prepared by a facile ball milling process. The milling time and the amount of the acryl type polymer dispersion agent were controlled to obtain well dispersed graphene oxide solution in ethanol. Consequently, the transparent and conducting graphene oxide film which had 69% transmittance and 1.5 x 10(6) ohm/sq surface resistance was produced by bar coating the solution on a PET substrate. The electrical property of the graphene oxide film could be further improved to 2.1 x 10(5) ohm/sq by hydrazine vapor reduction.</P>
다중기포 소노루미네센스를 이용한 CdS/TiO₂ 나노입자의 제조
변기택(Ki-Taek Byun),이승수(Seung Soo Lee),심일운(Il-Wun Shim),곽호영(Ho-Young Kwak) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Sonoluminescence (SL) is the light emission associated with the catastrophic bubble collapse of a gas bubble oscillating under an ultrasonic field. At the collapse, the bubble produces high temperature and pressure at liquid layer, where high energy chemical reaction can be possible. In the case of the MBSL, a lot of transient bubbles can be generated by the irradiation of high intensity ultrasound in aqueous solution. In this study, synthesis of cadmium sulfide(CdS) and a preparation of the nanoparticles coated on submicron titanium dioxide particles under ultrasonic field at the multibubble sonoluminescence(MBSL) condition were tried. At the optimal MBSL condition in aqueous solution containing cadium chloride of 8.8 wt%, thioacetamide of 11.5 wt% and TiO₂ of 0.8 wt%, CdS nanoparticles were synthesized first and subsequently nanoparticles of several nanometers of CdS/TiO₂(TiO₂ particles coated with CdS nanoparticles) particles were synthesized within 5 minutes. The prepared particles of CdS/TiO₂ were examined by XRD, EDS, UV-vis spectrophotometer, FE-SEM and TEM. The synthesized CdS/TiO₂ particles may be used for a material to reduce the recombination loss in dye solar cell unit.
다중기포 소노루미네센스를 이용한 β<SUB>bc</SUB> 형 수산화니켈의 제조
변기택(Ki-Taek Byun),서국원(Kook Won Seo),심일운(Il-Wun Shim),곽호영(Ho-Young Kwak) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Nanosized nickel hydroxide powder for alkine batteries was synthesized in aqueous or nonaqueous solution of nickel chloride with NaOH under ultrasound radiation at the multibubble sonoluminescence (MBSL) condition. Characterization by X-ray diffraction, transmission electron microscopy, FT-IR spectroscopy, as well as elemental analysis indicates the formation of β<SUB>bc</SUB>-type nickel hydroxide. The β<SUB>bc</SUB>-type nickel hydroxide synthesized in aqueous solution of NiCl₂ is slightly different that formed in nonaqueous solution of NiCl₂. The synthetic process of β<SUB>bc</SUB>-type nickel hydroxide at the MBSL condition was completed within 5 minutes. Coating of nickel hydroxide particles on various oxide particles such as Al₂O₃ and SiO₂ was also prepared at the MBSL condition.
변기택(Ki-Taek Byun),강상우(Sarng Woo Karng),김기영(Ki Young Kim),곽호영(Ho-Young Kwak) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Sonoluminescence (SL) characteristics such as pulse shape, radiance and spectrum radiance from submicron bubbles were investigated. In this study, a set of analytical solutions of the Navier-Stokes equations for the gas inside bubble and equations obtained from mass, momentum and energy equations for the liquid layer adjacent the bubble wall were used to estimate the gas temperature and pressure at the collapse point, which are crucial parameters to determine the SL characteristics. Heat transfer inside the gas bubble as well as at the liquid boundary layer, which was not considered in the most of previous studies on the sonoluminescence was taken it into account in the calculation of the temperature distribution inside the bubble. It was found that bremsstrahlung is a very possible mechanism of the light emission from either micron or submicron bubbles. It was also found that the peak temperature exceeding 10^6 K in the submicron bubble driven at 1 MHz and 4 atm may be due to the rapid change of the bubble wall acceleration near the collapse point rather than shock formation.