http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최다예,이정혜,안정현,서연림,우경인,김윤덕,Da Ye Choi,MD,Jung Hye Lee,MD,Jung Hyun Ahn,MD,Yeon Lim Suh,MD,PhD,Kyung In Woo,MD,PhD,Yoon Duck Kim,MD,PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.8
Purpose: Normal squamous cells do not exist in the orbit. Therefore squamous cell carcinoma of the orbit is rare and usually arises as a secondary tumor from distant metastasis or local invasion. The authors herein describe the first case of primary squamous cell carcinoma of the orbit in Korea. Case summary: A 74-year-old female presented with a 2-month history of left upper eyelid swelling and ocular pain. On physical examination, a round, firm, fixed and tender mass was palpable in the superomedial side of the left orbit. Magnetic resonance imaging (MRI) showed 21 mm x 15 mm x 20 mm-sized irregular soft tissue mass with indistinct margin and peripheral enhancement in the superomedial portion of the left orbit, and incisional biopsy of the mass was performed. Histopathological examination showed clusters of squamous cells with polymorphic nuclei and interspersed keratin pearls, consistent with findings of well-differentiated squamous cell carcinoma. Despite extensive systemic work-up, there was no sign of extraorbital malignancy. The patient received left exenteration and adjuvant radiation therapy. Ten months after enucleation, a 12 mm x 14 mm sized firm mass developed on the left forehead, and excisional biopsy and frontalis rotational flap reconstruction were performed. Histopathological examination of the mass was consistent with well-differentiated squamous cell carcinoma. The patient remained alive 17 months after diagnosis without evidence of local recurrence or distant metastasis. Conclusions: Primary squamous cell carcinoma should be considered in the differential diagnosis of acutely progressing tumors of the orbit. J Korean Ophthalmol Soc 2014;55(8):1224-1228
견인력 보상기법을 적용한 PM 견인전동기의 순시토크제어에 관한 연구
최다운(Da-Woon Choi),손동혁(Dong-Hyuk Son),조윤현(Yoon-Hyun Cho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The power density of a PMSM is higher than that of induction motor with same ratings due to the no stator power dedicated to the magnetic field production. Because of its high power density and smaller size, the PMSM has evolved as the preferred solution for traction motor in recent years. It is essential that both the traction motor and the associated drive operate at their optimal efficiencies throughout the driving schedule. Therefore, this paper proposes tractive force predicting method which can deduce the traction force the acceleration of the vehicle under different conditions. This method improves the instantaneous torque in comparison with the general control method. The simulation and experimental results validate the proposed method for monorail vehicle application.
손동혁(Dong-Hyeok Son),최다운(Da-Woon Choi),김명수(Myung-Su Kim),강인준(In-Jun Kang),김병국(Byung-Kuk Kim),조윤현(Yun-Hyun Cho) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 연구는 영구자석 AC 동기전동기의 초기 기동제어에 대하여 연구하였다. 회전자 위치 검출용 센서는 홀센서를 사용하였고 전동기 운전을 벡터제어를 사용하기 위해 전동기가 정지된 상태에서 홀센서 신호에 따른 회전자 위치를 계산하였다. 견인전동기가 주행저항 보다 큰 견인력을 내기 위해 전동기를 BLDC로 기동한 후 안정적 운전을 위해서 벡터제어로 전환하였다.
손동혁(Dong-Hyeok Son),최다운(Da-Woon Choi),김명수(Myung-Su Kim),김병국(Byung-Kuk Kim),조윤현(Yun-Hyun Cho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 연구는 홀센서를 이용한 PMSM의 벡터제어에 대하여 연구하였다. 회전자 위치 검출용 센서는 홀센서를 사용하였고 전동기 운전을 벡터제어를 사용하기 위해 전동기가 정지된 상태에서 홀센서 신호에 따른 회전자 위치를 계산하였다. 견인전동기가 주행저항 보다 큰 견인력을 내기 위해 전동기를 BLDC로 기동한 후 안정적 운전을 위해서 벡터제어로 전환하였다.
안대균(Dae Gyun An),노윤철(Yun Cheol Rho),한승호(Seung Ho Han),최다운(Choi Da Hun),조윤현(Cho Yun Hyun) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Wind power energy is one of the attractive renewable energies. Comparing to on-shore wind turbine, the off-shore wind turbine has advantages such as higher energy density and fewer constraint conditions. However, due to a high initial investment, the unit cost of power production should be reduced by using a large-scaled wind turbine with capacity of more than 5㎿. The geared-type wind turbine needs a relative high maintenance cost of power train system, so that the industries begin to pay attention to the large-scaled gearless-type wind turbine. In this paper, a case study to design the rotor of the AFPM(Axial Flux Permanent Magnet)-type generator applied to the gearless type wind turbine was performed. Under a design constraint of deformation, i.e. smaller than 3㎜ at the end of rotor, the design parameters such as thickness of spider and width of rib in the rotor were determined, in which the total weight of the rotor was below down 19tonf.