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RISS 인기검색어
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- 저자 : 卞廷煥 (검색결과 166 건)
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三種藥物이 家兎摘出子宮筋에 미치는 效果에 關한 實驗的 硏究
卞廷煥 경산대학교 제한동의학술원 1973 濟韓 Vol.1 No.-
Herbal Drugs for menstruation we found the reaction, affecting on exercised uterus as follows, acting rabbits with extract of fophora, achyranthes, and corydalys which are used most among herb drugs. 1. Sophora contracts uterine muscle at first but aftera a while it becomes relaxant and the more we give the animal the drug, the muscle relaxes, extinguishing the pain almost. 2. Achyranthes contracts uterine muscle greatly and as time past it becomes relaxing and when they are given more drug, the relaxed action is also decreasing but not so hard. 3. Corydalys makes uterine relaxed, accompanying little pain irregularly, if investigate much medicine it affects more contraction without paining but soon it relaxes again. With this result above, we could consider That sophera, achyranthes, and Corydalys are drugs which affect on uterine contraction, and Achyranthes the drug which acts irritation to uterus.
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록소프로펜산 분말의 화재사고 발생원인 검토 - 정전기적 중심으로 -
변정환,장봉두,최상원 한국화재조사학회 2016 한국화재조사학회 학술대회 Vol.2016 No.04
검토에서는 최근 발생한 록소프로펜산 분말의 화재사고와 관련하여 화재사고 발 생과정 및 화재사고 발생에 영향을 주는 요인들에 대한 분석을 토대로, 화재사고 기인 물의 물리적 위험성 시험·평가를 통한 록소프로펜산 분말의 화재사고 발생원인에 대 하여 검토하였다. 발생원인 검토를 위하여 유사시료의 최소 점화에너지의 측정과 분진 폭발 특성의 기본평가 항목인 입도와 수분함량 평가를 실시하였다. 최소 점화에너지 측정실험을 통하여 정전기 방전 에너지가 아세톤 및 록소프로펜산 분말의 최소 점화 에너지 보다 큰 경우 화재·폭발이 발생할 수 있음을 알 수 있었다. On the basis for analysis of the factors affecting fire occurrence process and the fire accident in connection with a fire accident Loxoprofen-Acid Powder as recently occurred, it was tested in the fire accident caused the Loxoprofen-Acid powder through a physical hazard testing and evaluation of fire-based figures. To survey causes, the particle size and moisture content of the primary evaluation of the measurement items in the dust explosion characteristics were evaluated and the minimum ignition energy measurement were tested on a similar sample. If the electrostatic discharge energy through the minimum ignition energy measurement test is greater than the minimum ignition energy of the Loxoprofen-Acid powder and acetone, it was found that the fire and explosion may occur.
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A Method of Synchronous Control System for Dual Parallel Motion Stages
변정환,최명수 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
A synchronous control system for dual parallel stages is proposed in order that the synchronous error owing to the skew disturbances can be quickly and stably eliminated. The control system is composed of two disturbance observers and a synchronous controller. The two disturbance observers are designed to decrease the mismatched dynamics between a nominal model and a real plant with nonlinear properties and to reject instantly disturbances for each stage. The synchronous controller is designed from the view point of accurate synchronization and improvement of damping characteristics for the synchronous control system. The proposed synchronous control system is evaluated and compared experimentally with a normal cross-coupling control system without disturbance observer. The experiment results show that the new control system considerably reduces the synchronous error against skew disturbances. In addition, the synchronous error can be quickly and more stably eliminated through the improvement of the damping characteristics of the synchronous control system using a PD compensator.
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확장성과 안정성을 고려한 동기제어계의 구축에 관한 연구
변정환,김영복,Byun, Jung-Hoan,Kim, Young-Bok 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
In this study, a methodology of synchronous control which can be applied to position synchronization of a multi-axes driving system has been developed. The synchronous error is caused by model uncertainties and disturbance at each axis. To overcome these problems, the synchronous control system of each axis has been composed of reference model, speed and synchronous controllers. The speed control system has been designed to follow speed reference. And the synchronous controller has been designed to keep minimizing the position synchronous error by reference model and H$\sub$ / approach. By the proposed method, position synchronous control system can be easily extended to two or more axes driving system. The effectiveness of the proposed method has been demonstrated by experiment.
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