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이돈용(D.Y.Lee),염영일(Y.Youm),정완균(W.K.chung),김정하(J.H.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
The steady state criteria for the hydraulic controlled mechanical governor with the critical center control valve is analyzed in this paper. Generally, the dynamic behavior of the governor depends on the input state variables. Therefore, if there exists the steady state solution for the given input state, the output state variables can be easily controlled to the desired condition by the hydraulic power system. On the other hand, it cannot be controlled well under unstable states such as hunting or diverging.<br/>
U. Yong(용의중),D. Kim(김동환),H. Kim(김호중),D. G. Hwang(황동규),S. Cho(조성건),H. Nam(남효영),S. Kim(김세진),T. Y. Kim(김태영),U. Jeong(정운룡),K. Kim(김기훈),W. K. Chung(정완균),W. H. Yeo(여운홍),J. Jang(장진아) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Over the years, engineered heart tissue (EHT), composed of cardiac cells and a hydrogel, has been considered as a promising in-vitro cardiac model in that it can reproduce the physiological contractions of an actual animal heart. In particular, the contractile force of EHT is one of the representative factors to evaluate drug-induced cardiotoxicity that is a major cause of the withdrawal of drug development. Although there have been a lot of methods to monitor the contractile force of the EHT, most of them are based on optical readout systems that have to process a huge amount of image data. Recently, a strain gauge-based microphysiological system was developed to monitor the contractile force of a laminar cardiac tissue, which can acquire real-time data with a relatively small amount of data. However, the system can monitor only few layers of cardiomyocytes, which are physiologically less relevant environment compared to EHT. Here, we developed a hybrid bioprinted tissue platform, consisting of six bipillar-grafted strain gauges (BPSGs) and one wireless device, that enables online monitoring of the contractile forces from 6 different EHTs in real time during culturing. Furthermore, we confirmed that our system can detect the effects of commercially available drugs on EHTs.