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안태훈(Ahn Tae Hun),안성학(Ahn Sung Hak),이송(Lee Song) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
The behavior of an opening and the performance of support system depend upon the load-deformation characteristics of ground and support as welt as of the manner and of timing of support installation. The load-deformation characteristics of ground and support are derived by the interaction between ground and support. The interaction between ground and support is qualitatively illustrated by a ground response curve. The behavior of an opening and the performance of support system depend upon the load-deformation characteristics of ground and support as well as of the manner and of timing of support installation. The interaction between ground and support is qualitatively illustrated by a ground response curve. The convergence-confinement method don"t need the basic assumptions for a mathematical model. Also This is applicable to general tunnel. Consequently the stability of tunnel must be qualitatively investigated by a ground response curve and quantitatively adjudged by a numerical analysis for the reasonable design of tunnel.
안태훈 ( Ahn Tae Hun ),정대석 ( Jung Dae Suk ),변봉섭 ( Byun Bong Sup ),이규환 ( Lee Kyu Hwan ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.1
A tunnel must be designed economically safely. We must calculate a load of a tunnel in order to confirm safety and an economy of a tunnel. However, this is impossible practically. Therefore, it is hard to confirm safety and an economy of a tunnel in the current techonology. This paper tried to grope for the way that can analyze safety and an economy of a modem tunnel. According to the study results, a support pattern of a modem tunnel is more appropriate for a Terzaghi's loosening load. RMR shows a too large safety rate. When design a modem tunnel, we can use a Terzaghi’s loosening load. In this case, the study about a way to adopt an appropriate safety rate is necessary.
초등과학 영재학급 학생과 일반학급 학생의 과학 학습정서와 과학적 상상력 비교
안태훈 ( Ahn Tae-hun ),최선영 ( Choi Sun Young ) 한국초등과학교육학회 2017 초등과학교육 Vol.36 No.2
The purpose of this study was to analyze science academic emotion and scientific imagination of students between a science gifted class and a general class in elementary school. Samples of this study were composed of 212 fifth and sixth graders in Gyeonggi province. The results of this study were as follows. First, positive scientific academic emotion of students in a science gifted class was higher than that of general class. Second, boredom and laziness of negative scientific academic emotion were higher scores in general students, whereas, angry area was higher scores of students in a science gifted class. Third, scientific imagination of students in a science gifted class was higher than that of general class. Fourth, both groups had a positive correlation between scientific imagination and positive science academic emotion. Especially, interest area of positive scientific academic emotion in both of the two groups influenced scientific imagination.
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)
[제2분과/내진성능/교량/지반] 터널 설계를 위한 지보 기준 연구
안태훈(Ahn Tae Hun),정대석(Jung Dae Suk),변봉섭(Byun Bong Sup),이규환(Lee Kyu Hwan) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
A tunnel must be designed economically safely. We must calculate a load of a tunnel in order to confirm safety and an economy of a tunnel. However, this is impossible practically. Therefore, it is hard to confirm safety and an economy of a tunnel in the current technology. This paper tried to grope for the way that can analyze safety and an economy of a modern tunnel. According to the study results, a support pattern of a modern tunnel is more appropriate for a Terzaghi's loosening load. RMR shows a too large safety rate. When design a modern tunnel, we can use a Terzaghi's loosening load. In this case, the study about a way to adopt an appropriate safety rate is necessary
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.