Kwan-Woong Gwak

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Ventricular assist devices now clinically used for treatment of end-stage heart failure require responsive and reliable hemodynamic control to accommodate the continually changing demands of the body. This is an essential ingredient to maintaining a high quality of life. To satisfy this need, a control algorithm involving a trade-off between optimal(More)
A safety-enhanced optimal (SEO) control algorithm for turbodynamic blood pump is proposed. Analysis of in vivo animal experimental data reveals that two new control indices-the gradient of pulsatility of pump pressure head with respect to pump speed and the gradient of minimum pump flow-have their peak within a proximity to the suction point but not at the(More)
Ventricular assist devices now clinically used for treatment of end-stage heart failure require responsive and reliable control to accommodate the continually changing demands of the body. However, due to the varying physiologic conditions and the limited use of the sensors to detect hemodynamic load and suction, it is difficult to control pump speed(More)
—For the development of cardiovascular devices and the study of the dynamics of blood flow through the cardiovas-cular system, hardware fluidic models are commonly used to minimize animal experiments and clinical trials. These systems, called " mock circulatory systems, " are also critical for the development of ventricular assist devices. The passive and(More)
Mock circulatory systems (MCS) are often used for the development of cardiovascular devices and for the study of the dynamics of blood flow through the cardiovascular system. However, conventional MCS suffer from the repeatability, flexibility, and precision problems because they are typically built up with passive and linear fluidic elements such as(More)
Physiological feasibility is the most important requirement for cardiovascular circulatory simulators (CCSs). However, previous simulators have been validated by a comparison with specific human data sets, which are valid only for very limited conditions, and so it is difficult to validate the fidelity of a CCS for various body conditions. To overcome this(More)
Interaction between wearable robot and the user may cause skin injury, especially the pressure ulcers due to sustained pressure at the connection site. In this study, relationship between pressure ulcer breakout time and applied pressure which is the major cause of pressure ulcer is modeled using human experimental data. The model is proposed to be used to(More)
Following the increased use of mobile robots in the field, the injury problem caused by the collision between human and the mobile robot has become an issue of growing importance in the society. Neck injury is considered as one of the major injury mode in collision-induced injury. Hence in this paper, AIS of the neck injury was predicted using the index of(More)
Chest injury during unconstrained frontal collision between human and mobile robot is investigated using computer simulation with MADYMO. To assess the chest injury, Combined Thoracic Index (CTI) and Viscous Criteria(VC) was computed. Computed CTI and VC were converted into AIS level by which injury level was evaluated.