http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
봉독이 골육종세포주에서 세포사멸 및 COX-2 억제에 미치는 영향
황대연,김호현,김창주,김이화,Hwang, Dae-yeon,Kim, Ho-hyun,Kim, Chang-ju,Kim, Ee-hwa The Korean AcupunctureMoxibustion Medicine Society 2003 대한침구의학회지 Vol.20 No.3
목적 : 한의학에서 관절염이나 진통치료에 사용되어 왔던 봉독약침액이 인간 골육종 세포주인 MG-63 세포에서 항종양효과가 있는지 연구하고자 한다. 특히 본 실험에서는 이러한 봉독의 종양발생 억제작용이 세포사멸과 관련이 있는지, 그리고 프로스타글란딘 합성 효소인 cyclooxygenase(COX)-2의 억제와 관련이 있는지를 연구하고자 한다. 방법 : 인간 골육종 세포주에서 세포사멸의 변화를 관찰하기 위해서 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium brimide(MTT) assay, 4,6-diamidino-2-phenylindole (DAPI), DNA fragmentation assay 및 reverse transcription-polymerase chain reaction(RT-PCR) 방법을 이용하였다. 결과 : 세포독성 검사에서 봉독은 MG-63 세포에서 농도-의존적으로 세포독성을 나타내었다. 이러한 봉독의 세포독성이 세포사멸로 인한 것인지를 여러 가지 형태로 검사한 결과 봉독에 의한 세포독성은 TUNEL 검사와 DAPI 염색시 세포사멸의 특징적인 소견들을 나타내었고, flow cytometric 분석에서도 세포사멸을 의미하는 세포주기의 변화들을 나타내었다. 봉독이 COX-2의 발현에 미치는 영향을 RT-PCR로 실험한 결과 봉독은 COX-2 mRNA의 발현을 선택적으로 억제하였다. 결론 : 본 실험의 결과 봉독은 COX-2 mRNA의 발현을 억제함으로써 골육종 세포에서 세포사멸을 유발하고 그 결과 항종양효과를 나타내는 것으로 보여진다.
황대연 ( Dae Yeon Hwang ),김연정 ( Youn Jung Kim ),장미현 ( Mi Hyun Jang ),정주호 ( Joo Ho Chung ),김창주 ( Chang Ju Kim ),김이화 ( Ee Hwa Kim ) 대한경락경혈학회 2000 Korean Journal of Acupuncture Vol.17 No.2
Stimulation of the auricle is known to be effective in reducing obesity. The aim of the present study is to investigate whether stimulating a specific auricular acupuncture point is effective on suppression of appetite. Vasoactive intestinal polypeptide (VIP) is known to induce a powerful feeding response after central administration and particularly abundant in the cerebral cortex. In food-deprived rats exhibiting a strong drive for feeding, decreased VIP release was markedly detected in the cerebral cortex of the brain. Needling the fasted rats on the specific auricular region increased the VIP level of the cerebral cortex. In conclusion, stimulating the specific auricular points increases VIP-expression in the cerebral cortex of the fasted rats and may be useful for controlling obesity.
권선계자형 동기전동기의 d축 쇄교자속에 의한 계자전류리플 보상 기법 개발
황대연(Dae-Yeon Hwang),구본관(Bon-Gwan Gu) 대한전기학회 2018 전기학회논문지 Vol.67 No.9
Recently, owing to environmental problems and instability of rare earth resources market, non-rare earth electric motors are attracting attention. As a non-rare earth motor type, a wound rotor synchronous motor(WRSM) has high power density and wide driving range further it can reduce loss by field current control during field weakening control at high speed. However, since the d-axis flux of the WRSM is coupled with the rotor circuit, the fluctuation in the d-axis flux linkage affects the rotor circuit, which causes ripple of the field current and torque. In this paper, we propose the field current ripple compensation method by injecting the feedforward voltage. the proposed compensating method was demonstrated by simulation and experiments.
황대연(Dae-Yeon Hwang),구본관(Bon-Gwan Gu) 대한전기학회 2020 전기학회논문지 Vol.69 No.6
The dual three-phase permanent magnet synchronous motor drive system consist of dual three-phase inverter and dual three-phase stator winding set in motor. The dual drive-mode that utilizes dual stator winding set and dual three-phase inverter is commonly used for general operation. However, in order to improve the total efficiency of the drive system, it is also necessary to consider the efficiency of a single drive mode such as a conventional three-phase drive. In this paper, the high efficiency drive strategy of dual three-phase permanent magnet synchronous motor is proposed to utilize the highest efficiency point in each drive mode. Based on the analysis about efficiency for each drive-mode, the drive-mode changeover is proposed. The experimental results validate the proposed high efficiency drive strategy.
원통공작물의 (圓筒工作物) 가공정도에 관한 연구 - 연동척을 중심으로 -
황대연(Dae Yeon Hwang) 대한공업교육학회 1984 대한공업교육학회지 Vol.9 No.1
This study is the experiment about the influence of three conditions on roundness; which are to increase the diameter of workpiece, to vary spindle speed of workpiece, and to vary chucking length. The results of the experiments are as follows; 1) In the case of increasing in diameter of workpiece, the roundness is decreased. 2) In the case of spindle speed keeps steady and the diameter of work pieces is increased the roundness is decreased because the cutting resistance decreased. 3) In the case of increasing in chucking length, roundness is decreased. 4) With the increasing of distance from chuck face, the roundness is increased.