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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/>
김세동,인주철,안종철,염영일,이일기,안면환,추도식 대한골절학회 1991 대한골절학회지 Vol.4 No.1
The bone plate, nail and external fixation apparatus have been indtroduced for the union of the ftactured bones. Recently, the external fixation technique has been revived, especially for the healing of the fractured tibia, femur, pelvis and forearm bones. The device was intended to neutralize a comminuted fracture by provision of interfragmentary compression. Numerous different types of external fixation apparatuses have been developed in U.S.A. and other European countries. However, m our country, the apparatuses have been imported and utilized for the surgical application without any experimental confirmation. For the elucidation of the usage of imported external fixation devices, the stiffness of the extemal fixation devices (Orthofix, Monofixateure, and Hoffmann) were analyized experimentally. MTS and universal testing machine(UTM) were used for the experimental analysis under the different loading conditions of axial compression, antero-posterior and medio-lateral bending. Furthermore, the stiffness and yielding load of the laboratory developed unilateral type of external fixatian device were compared with those of the imported ones. In addition to this, the configuration of laboratory developed device was changed for the parametric study under the axial compression. The stiffness and yielding load of the laboratory developed device were sufficient for surgical application. However, the weight of our laboratory developed model is 1.2 times the average weight of imported ones. The reduction of weight may be needed for more convenient surgical application