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이정한,김형식,허문창,김정회,Yi, Jeong-Han,Kim, Hyung-Sik,Hur, Moon-Chang,Kim, Jung-Hoe 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
Medical magnetic stimulator generates strong magnetic field pulses. Clinical applications of the magnetic pulse are the stimulation of nervous system and the contraction of muscle. The unique source of the strong magnetic pulse is a capacitor-inductor resonator and this inductor generates a strong sinusoidal magnetic pulse by discharging the capacitor with high initial voltage. Continuous muscle contraction needs sequential generation of the magnetic pulses. However, to keep the magnitude of sequential pulses identical, an expensive high-voltage power supply have to support voltage drop of the capacitor between the pulses. A protection circuit between the supply and the resonator is necessary to protect the supply from reverse current caused by capacitor voltage reversal. In this paper, a new circuit structure of the magnetic stimulator adopting a low-frequency fly-back switching is proposed. The new circuit supports sequential pulse generation and allows the reverse current without damage. Performance of the new circuit is examined and a low-cost magnetic stimulator for urinary incontinence therapy is being developed using the presented method.
PAV용 Skid Landing Gear의 설계 민감도에 대한 구조 해석적 연구
이창혁(Chang-Hyeok Lee),문창일(Chang-Il Moon),허장욱(Jang-Wook Hur) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.12
In this study, the design sensitivity of the landing gear, a component of the PAV and UAM airframes that are emerging as a new means of transportation in the field of aviation, was structurally analyzed. In the case of eVTOL type PAV and UAM airframes, mass production marketability must be ensured by reducing airframe development and maintenance costs; the skid type landing gear structure can meet this requirement. In this study, a large deformation finite element analysis was performed on a skid landing gear consisting of only an aluminum tube structure without a damper for shock absorption structural integrity was examined stress and displacement owing to design changes of members were analyzed, A trend analysis of design sensitivity was performed.