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고전압 대용량 유도전동기 구동용 H-브릿지 멀티레벨 인버터의 신뢰성 향상
박영민(Young-Min Park),이광환(Kwang-Hwan Lee),이세현(Se-Hyun Lee) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.2
This paper proposes the reliability improvement of H-Bridge Multi-level (HBM) inverter. This reliability can be implemented through modularization of power circuit, distribution of controller, duplication of controller and communication, and continuous operation method in case of power cell failure for driving medium-voltage & high-power induction motor. It is shown that the modularization and expansion characteristics of the HBM inverter are improved since the individual inverter modules operate more independently when using the proposed concept. Also the fault tolerance is increased by using power cell bypass. The proposed design and control methods are described in detail and the validity of the proposed system is verified experimentally in various industrial fields.
추나치료의 절대적 금기증에 대한 보고 1례 - Os Odontoideum을 진단받은 환자를 대상으로 -
문태웅,엄태웅,강명진,공덕현,정영훈,조태영,김기주,이광환,Moon, Tae-Woong,Eom, Tae-Woong,Kang, Myung-Jin,Kong, Duck-Hyun,Chung, Young-Hoon,Cho, Tae-Young,Kim, Ki-Joo,Lee, Kwang-Hwan 척추신경추나의학회 2008 척추신경추나의학회지 Vol.3 No.1
Objectives : The os odontoideum is an uncommon abnormality which is due to non fusion of axis and odontoid process that exists as a separate ossicle apart from a hypoplastic dens. Its clinical significance lies in its potential to produce serious neurologic symptoms after cervical Chuna Manipulation Treatment. We experienced a patient diagnosed as os odontoideum which corresponds to absolute contra-indications of chuna manipulation treatment and report it. Methods : The patient was diagnosed as os odontoideum through cervical spine CT and MRI. Results and Conclusion : During cervical physical examination, we encountered L'hermitte's phenomenon from the patient and suspected one of contra-indications of chuna manipulation treatment. We could diagnose the patient as os odontoideum through cervical spine CT, MRI and prevent him from severe sequelae caused by chuna manipulation treatment.