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윤승환(Seong-Hwan Yoon),조문규(Moon-kyu Cho),김정근(Jeong-Geum Kim),심상훈(Sanghoon Sim),전계익(Kye-Ik Jeon) 제어로봇시스템학회 2011 제어로봇시스템학회 합동학술대회 논문집 Vol.1 No.2
1~18 GHz의 광대역 동작 주파수와 Watt급 출력 전력을 갖는 고출력 분산 증폭기를 상용 0.25 um GaN-on SiC HEMT 공정을 이용하여 MMIC로 설계 및 제작하였다. 개발된 분산 증폭기는 광대역에서 이득 특성을 개선하기 위해서 2개의 서로 다른 분산 증폭기를 서로 직렬 연결한 구조로 설계되었으며, 28 v (170 mA)의 DC 바이어스에서 1~18 GHz의 광대역에서 13dB 이상의 고이득 특성을 가지며, 30dBm 이상의 높은 포화 출력 전력 성능을 나타내었다. 제작된 분산증폭기 MMIC의 크기는 2.75 x 1.75 mm²이다.
최진호,김일규,오성섭,오남식,윤승환,Choi, Jin-Ho,Kim, Il-Kyu,Oh, Seong-Seob,Oh, Nam-Sik,Yoon, Seung-Hwan 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.2
Sialolithiasis is relatively common disease of the salivary gland in the field of Oral & Maxillofacial surgery. Obstruction of salivary secretion by a sialolith can result in swelling and pain, as well as infection of the gland. The swelling is usually correlated to meals, when salivary secretion is enhanced. Sialolithiasis occurs mainly in the submandibular gland(92%) and to a lesser degree in the parotid gland(6%). The sublingual gland and the minor salivary gland are rarely affected(2%). This is a report of rare case, the authors have experienced, within the left sublingual gland and the minor salivary glands. It is multiple sialolithiasis(about 22 silaoliths) in the sublingual and the minor salivary glands which has very low incidence of sialolithiasis. The pathosis were removed using transoral sialolithotomy with sublingual sialadenectomy.
조문규(Moonkyu Cho),윤승환(Seong-Hwan Yoon),김정근(Jeong-Geun Kim),심상훈(Sanghoon Sim),전계익(Kye-Ik Jeon) 제어로봇시스템학회 2011 제어로봇시스템학회 합동학술대회 논문집 Vol.1 No.2
X/Ku-band 대역의 위상배열 안테나용 LNA를 상용 0.25um GaN HEMT공정을 이용하여 MMIC로 설계 및 제작하였다. X/Ku-band의 두 대역에서 동작하기 위해서 Lange coupler를 이용한 balanced LAN구조를 이용하여 광대역 이득 및 정합 특성을 가지게 설계하였다. 제작 된 칩의 소신호 이득은 9~15 GHz 주파수에서 15dB 이상의 이득 및 ?10 dB이하의 입력 정합특성을 나타내었으며 4.5dB 이하의 잡음 지수를 나타내었다. 제작된 LNA의 칩 크기는 1.75x2.75 mm² 이다.
A Study on the FDI Determinants of American Manufacturing Enterprises into local China
신광하(Kwang-Ha Shin),윤승환(Seong-Hwan Yoon),박명찬(Myung-Chan Park) 한국무역연구원 2010 무역연구 Vol.6 No.1
This study tries to analyze the investment determinants of American enterprises in local China, where the American investing ones have been operating since in the early of 1990s. The main purpose can be mentioned to test empirically some relations between the investment determinants of American enterprises and the investment types. In detail speaking, the dependent variables of investment types are classified with sole venture and joint venture, while the independent ones are sorted based on the previous studies with the 2 following factors like the competitive advantages of American enterprises, and the location advantages of local enterprise. This study is conducted as the following: the survey of American enterprises engaging in investment activities in there is implemented by collecting questionnaires. And for testing the hypothesis, the path analysis of structural equation modeling is activated with SPSS. 12.0 and AMOS 11.0 for windows.
응급센터를 내원한 대퇴골 골절 환자에서 골밀도와 생화학적 표지자들의 의의
이경미 ( Kyoung Mi Lee ),한승백 ( Seung Baik Han ),김준식 ( Jun Sig Kim ),백광제 ( Kwang Je Baek ),홍성빈 ( Seong Bin Hong ),문경호 ( Kyoung Ho Moon ),강준순 ( Joon Soon Kang ),윤승환 ( Seong Hwan Yoon ) 대한외상학회 2005 大韓外傷學會誌 Vol.18 No.2
Backgound: The most frequent fracture seen at the emergency department (ED) in the elderly is a femur fracture whereas they do not know the degree of osteoporosis. We analyzed the degree of osteoporosis in patients with femur fractures and compared patients with only femur fractures (FX) to patients with femur and vertebral fractures (VX) by examining the clinical features, the bone mineral density (BMD), and biochemical markers. Methods: From January 2004 to December 2004, we enrolled prospectively 30 femur fracture patients who visited the ED. The bone mineral densities of the lumbar spine and the femur were examined. Total calcium, phosphate, alkaline phosphatase, osteocalcin, and serum C-terminal telopeptide (s-CTx) were measured. The patients with femur fractures were divided into two subgroups according to the presence of vertebral fracture. Results: All BMDs of the FX group showed osteoporosis. The s-CTx levels were higher than normal. The patients in the FX with VX were older than those in the FX only group, and had lower BMDs. There were no significant differences in markers between the subgroups, but the incidence of trochanteric fractures was higher in FX with VX group than in the FX only group. Conclusion: Femur fractures in the elderly were associated with osteoporosis. In our study, despite a considerable difference in BMD between patients with femur fractures and those with femur fractures combined with vertebral fractures, there was no difference in biochemical markers on bone formation nor in the those of bone resorption. We will further investigate the biochemical markers and BMD in the population of osteoporotic fractures. So those indicators should be helpful for planning treatment and for prevention of FX in the elderly.