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갑상선 유두상암의 수술 전 림프절 전이 진단에서 경부 단층 촬영과 퓨전 양전자 방출 단층 촬영 비교
정성일,강현종,유영범,Sung Il Jung,M,D,Hyun Jong Kang,M,D,and Young Bum Yoo,M,D,Ph,D 대한갑상선-내분비외과학회 2009 The Koreran journal of Endocrine Surgery Vol.9 No.3
Purpose: Lymph node metastasis is one of the most important prognostic factors for patients with papillary thyroid cancer. In this study we compared the diagnostic accuracy of neck CT with that of <SUP>18</SUP>F-FDG PET-CT for the preopera</SUP>tive evaluation of lymph node metastasis. Methods: We reviewed the medical records of 56 patients who received surgery for papillary thyroid cancer at the Department of Surgery, Konkuk University Medical Center, from August, 2006 to January, 2009. All the patients were checked with neck CT and <SUP>18</SUP>F-FDG PET-CT preoperatively for evaluating their lymph node status. Results: Neck CT showed a sensitivity of 40%, a specificity of 74.2%, a positive predictive value of 55.6%, a negative predictive value of 60.5% and an accuracy of 58.9%. <SUP>18</SUP>F-FDG PET-CT showed a sensitivity of 48%, a specificity of 80.6%, a positive predictive value of 66.7%, a negative predictive value of 65.8% and an accuracy of 66.1%. <SUP>18</SUP>F- FDG PET-CT had greater sensitivity, specificity, positive predictive value, negative predictive value and accuracy than did neck CT (P=0.02) for predicting lymph node metastasis in patients with papillary thyroid cancer. Conclusion: <SUP>18</SUP>F-FDG PET-CT can be more dependable than neck CT for preoperatively assessing lymph node metastasis in patients with papillary thyroid cancer. (Ko</SUP>rean J Endocrine Surg 2009;9:140-143)
열등가회로를 이용한 5 kW 급 영구자석 동기전동기의 정상상태 열 특성 해석
김태현(Tae Hyun Kim),유영범(Young Bum Yoo),나종승(Jong Seung Na),유경태(Kyongtae Ryu),문윤재(Yoon Jae Moon),이재헌(Jae Heon Lee),이주(Ju Lee),박찬배(Chan Bae Park),문승재(Seung Jae Moon) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.11
본 논문에서는 영구자석 동기전동기의 특정 운행조건 중 발생하는 열 발생량에 대해, 열등가회로를 이용하여 정상상태 열 해석을 수행하였다. 최근 전동기는 소형, 경량화되며 극한 운행조건에서도 고출력 밀도를 견뎌야 한다. 특히, IPMSM 의 코일과 영구자석에서 발생하는 과도한 열은 전동기의 출력을 감소시키고, 전동기의 수명에 악영향을 끼치기 때문에 설계단계에서 IPMSM 의 열 해석이 중요하다. 그러므로, 본 연구에서는 열등가회로를 이용하여 IPMSM 의 설계변수 변화에 따라 정상상태 열 해석을 진행하였다. 변화된 설계변수는 하우징의 축방향 길이 그리고 하우징 두께이다. 마지막으로 열등가회로를 이용한 열 해석 결과와 유한요소법을 이용한 열 해석 결과를 비교하고, 열 해석 결과에 정확성과 신뢰성을 확인하고자 한다. Steady-state thermal analysis was performed on a thermal equivalent circuit to determine the heat generation during operation of an interior permanent magnet synchronous motor (IPMSM). New machines must be compact and light and produce high torque density under extreme environmental conditions. Thermal analysis of an IPMSM is particularly important because excessive heat generated from the core and magnet reduces the IPMSM"s output and has adverse effects on the durability. Therefore, steady-state thermal analysis of an IPMSM was performed for changes in the design variables using a thermal equivalent circuit. The changed variables were the axis length and thickness of the housing. The results of this method were compared with those of the finite element method to verify the accuracy and reliability.