http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
진선미(Sun-Mi Jin),유현호(Hyun-Ho Ryu),류석환(Seok-Hwan Ryu),신동윤(Dong-Yoon Shin),황희성(Hie-Sung Hwang),김철훈(Chul-Hoon Kim),김복주(Bok-Joo Kim) 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.6
Epithelial-myoepithelial carcinoma (EMC) is a low-grade malignant salivary gland neoplasm that was first described in 1972. EMC occurs in the older age group, there is a female predilection and mainly involves the parotid gland. Most authors recommend superficial parotidectomy as a treatment for low-grade malignant tumor in the superficial lobe of parotid gland. The treatment of epithelial-myoepithelial tumors typically includes surgical excision aimed at achieving a R0 resection. This paper reports a case of EMC of the parotid gland treated only by a conservational surgical excision. The lesion was exposed by the retromandibular approach and detached. After the parotid gland envelop was exposed, the mass was observed and was easy to remove due to capsulation. The preoperative diagnosis was a pleomorphic adenoma on the left parotid gland. The tumor was removed surgically with a conservative extracapsular dissection. The postoperative diagnosis was EMC, so superficial parotidectomy or radiation therapy was considered. Nevertheless, the patient was observed and no additional treatment was attempted because the patient was old and a successfully excision of the tumor had been achieved.
전류 평형 기법을 가지는 인버터 기반 LED 구동 회로 설계
이상헌(Sang-Heon Lee),곽상신(Sang-Shin Kwak),김태식(Tae-Sik Kim),류석환(Seok-Hwan Ryu),오세일(Se-Il Oh),원순호(Soon-Ho Won),권우현(Woo-Hyen Kwon) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
현재 LED를 이용한 기술 발달로 그 이용범위가 점차 넓어지고 있다. 하지만 똑같은 LED라도 그 특성이 다르기 때문에 밝기의 차이가 나타나게 된다. 본 논문에서는 LED string의 구동을 위해 직류 전압을 인가하는 방법과는 달리, 트랜스포머를 이용한 인버터 기반 LED 구동 회로를 통해 교류전압에 대해서도 LED string에 전류가 평행하게 흐르도록 구동 가능한 회로를 설계하였다. 각 LED branch의 양단에 트랜스포머의 l차측을 연결하고, 2차 측 트랜스포머를 함께 연결하여 Closed loop로 구성함으로써 LED String의 동작에서 중요한 요소인 Current sharing효과를 통해 전류 평형을 Pspice 시뮬레이션을 통해 검증하였다.