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중등도 및 중증고혈압에서 Nifedipine 설하투여의 강압효과에 관한 연구
김영훈,서순규,최인석,김열홍,안희권,심완주,노영무 대한내과학회 1986 대한내과학회지 Vol.31 No.5
In order to assess the efficacy of sublingual nifedipine in the acute treatment of moderate to severe hypertension, a single blind test was done in 30 patients, 10 males and 20 females, aged 40 to 76 years, with moderate to severe hypertension. The patients with mean sitting blood pressure(BP) of more than J40 mmHg received sublingual placebo, and BP and pulse rate(PR) were measured in sitting position 10,20 and 30 minutes after the sublingual placebo was given. The patients with post-placebo 30 minutes sitting mean BP of less than 13pmmHg were excluded from the study. The placebo treatment period was followed by the administration of 10mg of sublingual nifedipine, and BP and PR were measured 10,20,30 and 45 minutes after nifedipine was given. BP decreased with placebo treatment(p$lt;0. 01 by paired t-test, preplacebo vs. post-placebo 30 minutes). With sublingual nifedipine BP started to fall in 10 minutes and reached the lowest levels in 30 or 45 minu1es. The systolic BP decreased from 198.0±21.4mmHg to 159±20.4mmHg, diastolic BP from 122.5±13.0 mmHg to 103.2±14.4 mmHg and mean from 147.7±13.4 mmHg to 121.7±14.8 mmHg 45minutes after nifedipine(p$lt;0.01 by paired t-test). The average fall in systolic BP/diastolic BP/mean BP 45 minutes after nifedipine was 39/19/26 mmHg(p$lt;0. 001, by paired t-test). The maximal fall in systolic BP correlated better with pretreatment value(r=0.42) than the maximal fall in diastolic pressure(r=0.21), PR increased from 79±12 to 87±11/minute with nifedipine(p$lt;0.001, by paired t-test). Side effects were mild facial flushing(16.7%) and palpitation (3.3%). The findings suggest that a dose of 10mg of sublingual nifedipine is a simple, effective and safe method for the acute treatment of moderate to severe hypertension and can be used as a non-injecting alternative agent for the treatment of hypertensive emergency.
하이브리드 굴삭기 시스템의 에너지 절감에 대한 기초 연구
윤홍수(Y. S. Yoon),안경관(K. K. Ahan),윤종일(J. I. Yoon),강종민(J. M. Kang),김재홍(J. J. Kim) 유공압건설기계학회 2008 유공압건설기계학회 학술대회논문집 Vol.2008 No.10
Today, hydraulic systems play an important role in modern industry for the reasons that hydraulic actuator systems take many advantages over other technologies with high durability and the ability to produce large forces at high speeds. In recent years, electro-hydraulic actuator systems, which combine electric and hydraulic technology into a compact unit, have been adapted to a wide variety of force, speed and torque requirements. Moreover these systems resolve energy consumption and noise problems characteristic existed in the conventional hydraulic systems. Therefore, these systems have a wide range application fields especially in an excavator. Therefore the purpose of this paper is to demonstrate efficiency of the energy saving and present some control algorithms on a proposed system which apply to electro-hydraulic actuator system in the bucket of the excavator. Experiments are carried out to verify the effectiveness of the proposed system with various external loads as in real working conditions.
VCM을 이용한 비원형 형상 가공의 궤적 오차 시뮬레이션
황진동(J. D. Hwang),곽용길(Y. K. Kwak),김선호(S. H. Kim),안중환(J. H. Ahan) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
A Simulation model is developed to minimize the path tracking errors when the non-circular cutting is done by a VCM(voice coil motor) driven tool. The relationship between PWM(Pulse Width Modulation) duty ratio and velocity of voice coil motor is theoretically derived from combining the circuit equation for the coils and the motion equation for the magnetic rod of the voice coil motor. The path tracking errors are showed differently according to the rotational speed, the number of segments and the control period in digital control. Given a required accuracy in the non-circular cutting, the optimal values for those parameters are determined based on the developed simulation model.
보이스 코일 모터의 정밀위치 제어를 위한 수학 모델링 및 검증
황진동(J. D. Hwang),김주현(J. H. Kim),곽용길(Y. K. Kwak),김선호(S. H. Kim),안중환(J. H. Ahan) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Voice Coil Motor is used linear motion actuator system that require precision positioning control. In order to control precision positioning of voice coil motor, Mathematical model of voice coil motor is needed. Mathematical model is obtained by combining voice coil motor"s equation of motion with the equation of circuit and characteristic of voice coil motor. The induced model can predict output displacement according to duty ratio and amplitude. The model is verified by experimental test. Simulated results have tracking errors of less than 10 percent of experimental results.