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Genetic polymorphism of catechol-O-methyltransferase and cytochrome P450c17 in preeclampsia (초)
육지형 ( Ji Hyoung Yook ),( Ji Hyae Lim ),( Shin Young Kim ),( Do Jin Kim ),( So Yeon Park ),( Ho Won Han ),( Jung Yeol Han ),( Si Won Lee ),( Jae Hyug Yang ),( Hyun Mee Ryu ) 대한산부인과학회 2010 대한산부인과학회 학술대회 Vol.96 No.-
GER 유체를 이용한 ER Brake System의 설계 및 속도 제어
육지용(Yook, J.Y.),최승복(Choi, S.B.),육운수(Yook, W.S.) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.4
This paper presents robust control performance of a direct current(DC) motor with brake system adopting a giant electrorheological(GER) fluid, whose distinguished feature is an extremely high value of yield stress. As a first step, Bingham characteristics of the GER fluid is experimentally investigated using the Couette type electroviscometer. A cylindrical type of ER brake is then devised based on the Bingham model, and its braking torque is evaluated. Structural analysis of ER break is performed using ANSYS. After formulating the governing equation of motion for the DC motor with ER brake system, a sliding mode control algorithm, which is very robust to external disturbances and parameter uncertainties, is synthesized and experimentally realized in order to achieve desired rotational speed trajectories. The tracking responses of the control system are then evaluated and verified by presenting speed control performance.