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실험연구 : Ketamine이 백서 자궁 평활근의 수축에 미치는 영향
안태훈 ( Tae Hun An ),소금영 ( Keum Young So ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.52 No.1
Background: It has been reported that ketamine induced contraction of the uterus. Therefore, it has been recommended as a suitable obstetric anesthetic agent. However, some investigators reported that ketamine inhibited contraction of rat uterine smooth muscle. There has been argument about its effect on the uterine contraction. The aim of the present study was to investigate the effect of ketamine on rat uterine contractile activity in vitro. Methods: Uterine smooth muscle tissues were obtained from non-pregnant rats (n = 20). The uterine ring segments were mounted in organ bath filled with Krebs solution with 95% O2 and 5% CO2. After spontaneous activity had been accomplished, ketamine in various concentrations (10-7 M to 10-3 M) was added cumulatively to the bath and the effects were continuously registered. Results: Ketamine in dose of 10-5 M increased spontaneous myometrial contractile activity. But, ketamine in doses of 10-4 to 10-3 M induced a dose-dependent inhibition of spontaneous myometrial contractile activity. Conclusions: Ketamine constricted the uterine smooth muscle in concentration of 10-5 M but, relaxed the uterine smooth muscle in high concentrations (10-4 to 10-3 M). (Korean J Anesthesiol 2007; 52: 77~80)
안태훈(Tae Hun An),박석천(Sok Cheon Pak),안태규(Tae Gyu Ahn) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.6
Objective : Oxytocin antagonists maybe useful in inhibiting the uterine contractions of preterm labor. One such compound is TT-235. The purpose of this study was to compare the resistance of TT-235 and oxytocin to enzymatic degradation by oxytocinase in pregnant human. Methods : Blood samples from pregnant women not in labor were incubated in vitro with known amounts of oxytocin and TT-235. Samples were collected at 0, 15, 30, 45 and 60 minute intervals for oxytocin analysis and at 0, 10, 60 and 360 minutes for TT-235 analysis. Oxytocin was analyzed by radioimmunoassay after extraction while TT-235 was analyzed by radioreceptor assay. Results : In human blood, oxytocin was readily metabolized with greater than 83% disappearance over the 60 minute incubation period. In contrast, TT-235 was stable up to 360 minutes of incubation. Conclusion : This study suggests that: (1) blood from pregnant human does contain oxytocinase at least in vitro; and (2) TT-235 was resistant to enzymatic degradation by human blood, implying that this oxytocin antagonist may have prolonged activity in vivo in humans.
안정열 ( An Jeong Yeol ),고광곤 ( Go Gwang Gon ),손지언 ( Son Ji Eon ),신미승 ( Sin Mi Seung ),유원석 ( Yu Won Seog ),안태훈 ( An Tae Hun ),신익균 ( Sin Ig Gyun ) 한국지질동맥경화학회 ( 구 한국지질학회 ) 2002 韓國脂質學會誌 Vol.12 No.1
Background : We have previously shown that conventional dose hormone replacement therapy (C-HRT) improved nitric oxide (NO) bioactivity and reduced markers of inflammation in postmenopausal women (PMW). The effects of low-dose hormone replacement therapy
실험연구 : Propofol이 백서 자궁 평활근의 수축에 미치는 영향
오경희 ( Kyung Hee Oh ),안태훈 ( Tae Hun An ),정종달 ( Jong Dal Jung ),소금영 ( Keurn Young So ),임형석 ( Hyung Suk Lim ),송창훈 ( Chang Hun Song ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.52 No.1
Background: Propofol is an alternative to thiopental as an intravenous induction agent for cesarean section. It is also used as a sedative for supplementation of regional blockade during cesarean section. It has been reported that propofol relaxes not only vascular smooth muscle but also other smooth muscles. The aim of this study was to investigate the effect of propofol on rat uterine smooth muscle in an isolated preparation in the rat. Methods: Uterine smooth muscle tissues were obtained from rats (n = 21). The muscle strips were suspended in tissue baths and isometric tension was recorded. After spontaneous or oxytocin induced activity had been accomplished in the buffer solution as a control, propofol (1 to 20μg/ml) in fat emulsion was applied cumulatively to the bath and the effects were continuously recorded. Results: In vitro, propofol induced a dose-dependent inhibition of spontaneous as well as oxytocin induced myometrial contractile activity. Propofol concentration of 1 μg/ml had no significant effects on the resting tension, active tention, and frequency of contraction developed by spontaneous and oxytocin induced uterine contractility. However, Complete muscular relaxations on spontaneous and oxytocin induced contractility were obtained at a concentration of 10 μg/ml and 20μg/ml, respectively. Conclusions: Propofol inhibits spontaneous and oxytocin-induced uterine smooth muscle contractions in dose dependent pattern. (Korean J Anesthesiol 2007; 52: 76~80)
배영훈,안태훈,임성철,박석천,이재창,강남현,배춘식,Bai, Young-Hoon,An, Tae-Hun,Lim, Sung-Chul,Pak, Sok-Cheon,Lee, Jae-Chang,Kang, Nam-Hyun,Bae, Chun-Sik 대한수의학회 2002 大韓獸醫學會誌 Vol.42 No.2
For the induction of arthropathy, 5% hydrogen peroxide($H_2O_2$) was injected for 5 weeks into the intraarticular space of the New Zealand white rabbits to damage articular cartilage. Alginic acid of low molecular weight (2%) made from macromolecular alginate treated with enzyme was administered into articular space at the dose of 5 mg/kg twice a week for 3 and 6 weeks using 1 ml syringe and 26 G needle. Saline was injected for the control. Tissues surrounding the articulation were obtained for the measurements of superoxide dismutase(SOD) activity as a major antioxidant enzyme and malondialdehyde (MDA) as a lipid peroxidation level. Histopathologic examination on the surface of articular cartilage was carried out. Data showed that injection of hydrogen peroxide for 5 weeks had led to the induction of free radical damage and of articular cartilage change as confirmed by microscopic observation. The application of hydrogen peroxide caused a gradual increase in the SODs and MDA. These patterns were similar after 3 and 6 weeks of alginate treatment. Furthermore, microscopic examinations revealed that hydrogen peroxide caused flaking, fibrillation, fissuring, denudation, and hypocellularity in the articular surfaces. In conclusion, lipid peroxidation was demonstrated in the articular cartilage by the administration of hydrogen peroxide in the rabbit model. This lipid peroxidation could be caused by oxygen free radicals. The histologic and enzymatic correlations on lipid peroxidation in the articulation have provided a better understanding of arthropathy. It is possible to take advantage of these findings to evaluate effective alginate dosage more efficiently.
감쇄 환경에서 여러 입력 여러 출력 시스템에 알맞은 혼합 검파 방식
오종호,안태훈,송익호,박주호,박소령,Oh Jong-Ho,An Tae-Hun,Song Iick-Ho,Park Ju-Ho,Park So-Ryoung 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.9C
Multiple input multiple output architectures, known to provide high spectral efficiencies, can provide the best performance in terms of the block error rate when a maximum likelihood (ML) detector is employed. The complexity of the ML detector, however, increases exponentially with the numbers of transmit antennas and signals in the constellation. The zero forcing (ZF) detector has been suggested as a reduced-complexity detection method at the cost of performance degradation. In order to improve the performance of the ZF detector while reducing the complexity of the ML detector, we propose a novel multistage decision method. Numerical results show that, despite the proposed detector has a lower complexity than the ML detector, the performance difference between the ML and proposed detectors is negligibly small at high SNR. 여러 입력 여러 출력 시스템은 주파수 효율이 높으며, 가장 비슷함 검파기를 쓸 때 성능이 가장 뛰어나다. 가장 비슷함 검파기는 송신 안테나와 별자리의 신호수가 많아지면 지수적으로 복잡해지므로, 성능은 가장 비슷함 검파기보다 떨어지지만 복잡하기는 덜한 영 만들기 검파기가 제안된 바 있다. 이 논문에서는 가장 비슷함 검파기보다 덜 복잡하고 영 만들기 검파기보다 성능이 나은 새로운 검파 기법을 제안한다. 제안한 기법은 신호대잡음비가 높을 때 더욱 효과적임을, 곧, 가장 비슷함 검파기보다 덜 복잡하고 성능은 거의 같음을, 보인다.