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직렬 멀티레벨 H-bridge inverter에서 SHE-PWM방식을 사용한 출력 전압의 제거
김정용(J.Y.Kim),정승기(S.G.Jeong) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper proposes a method of voltage control for three-phase multilevel H-bridge inverters with selective harmonic elimination (SHE) PWM The full-bridge configuration of H-bridge inverter cells enables voltage control with a fixed PWM pattern by means of phase shifting between the legs, which greatly simplifies the control while maintaining the harmonic elimination characteristics The series combination of the cells in multilevel configuration can be exploited to further improve the bormonic elimination characteristics with proper phase shifting betwen the cell volitage A complexor-based control method is introduced to control the magnitude and phase angle of cell voltages that form three phase multilevel output voltages Simulation results show that the proposed method along with SHE PWM would provide satisfactory performance in spite of its simplicity.
Tc-99m-albumin 혈관조영술로 진단한 간혈관종의 1예
고창순,최강원,윤휘중,문희범,권인순,김정용 대한핵의학회 1979 핵의학 분자영상 Vol.13 No.1
A case of hepatic hemangioma is presented in which blood pool imaging by Tc-99m-HSA provided a definite diagnostic clue. Cavernous hemangiomas are the most common benign tumor of the liver. But the majority of them are asymptomatic and are found incidentally at laparotomy or autopsy. Selective hepatic arteriogrophy has been the most helpful technique for the preoperative diagnosis. Recently radioisoeope scan and ultrasonogram proved to be a new, definite and non- invasive diagnostic procedure. $quot;