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RISS 인기검색어
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- 저자 : 남기현(Kee-Hyun Nam) (검색결과 75 건)
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남기현(Kee-Hyun Nam),윤지섭(Ji-Sup Yun),이용상(Yong Sang Lee),정종주(Jong Ju Jeong),장항석(Hang-Seok Chang),정웅윤(Woong Youn Chung),박정수(Cheong Soo Park) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.74 No.3
Purpose: Postoperative hypocalcemia is a common complication of thyroidectomy. This study evaluated the incidence and risk factors for postoperative hypocalcemia after total thyroidectomy. Methods: There were 196 consecutive patients undergoing total thyroidectomy for thyroid cancer between September 2004 and February 2005 who were enrolled in this study. Patients were divided into two groups, those remaining normocalcemic (Group Ⅰ) and those who had hypocalcemia requiring treatment (Group Ⅱ). Group Ⅱ was subdivided into a transient hypocalcemic group (Group ⅡA) and a permanent hypocalcemic group (Group ⅡB). All groups were compared with regard to age, gender, histology, coexisting disease, T stage, bilateral lesions, primary total thyroidectomy versus secondary completion thyroidectomy, extent of lymph node dissection, and autotransplantation of the parathyroid gland. Results: Among all patients, 139 (71%) were in Group I, 54 (27.5%) in Group ⅡA and 3 (1.5%) in Group ⅡB. On the multivariate analysis for risk factors compared between Group Ⅰ and Group Ⅱ, the T4 stage was the most significant for the development of postoperative hypocalcemia. On the univariate analysis comparing factors between Group ⅡA and Group ⅡB, the T4 stage and a complete thyroidectomy were significantly related to the development of permanent hypocalcemia. Conclusion: The results of this study showed that the incidence of transient hypocalcemia, after total thyroidectomy, was 27.5%, while permanent hypocalcemia was detected in 1.5% of cases. The parathyroid glands should be preserved more carefully to avoid postoperative hypocalcemia in patients with high risk factors including T4 tumors and complete thyroidectomy procedures.
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새로운 보상 파라미터를 가지는 적응제어 기반 영구자석 동기전동기의 센서리스 속도제어
남기현(Kee-Hyun Nam),권영안(Young-Ahn Kwon) 대한전기학회 2013 전기학회논문지 Vol.62 No.7
Recently, sensorless controls, which eliminate position and speed sensor in a permanent magnet synchronous motor drive, have been much studied. Most sensorless control algorithms are based on the back-EMF and speed estimations which are obtained from the voltage equations. Therefore, the sensorless control performance is largely affected by the parameter errors of a motor. This paper investigates a novel adaptive control with the parameter error compensation for the speed sensorless control of a permanent magnet synchronous motor. The proposed parameter estimation is obtained from the d-axis current error between the real and estimated currents. The proposed algorithm is verified through the simulation and experimentation.
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이용상,남기현,임치영,이잔디,장항석,홍순원<SUP>1<.SUP>,박정수,Yong-Sang Lee,M.D.,Kee-Hyun Nam,M.D.,Chi Young Lim,M.D.,Jandee Lee,M.D.,Hang-Seok Chang,M.D.,Soon Won Hong,M.D.<SUP>1<.SUP> and Cheong Soo Park,M.D. 대한갑상선-내분비외과학회 2005 The Koreran journal of Endocrine Surgery Vol.5 No.1
The fibromatosis (desmoid tumor) is histologically benign fibrous neoplasm arising from the musculoaponeurotic structures through out the body, but that shows locally aggressive growth. Common anatomic sites includes the limbs, trunk and mesentery. Fibromatoses arising in the neck have been reported rarely. If the tumors are occurred in the neck, complete resection is often difficult, because of its locally infiltrative nature. Therefore radiotherapy, chemotherapy and hormonal therapy are occasionally needed to reduce local recurrence. We report herein a case of fibromatosis arising in the left supraclavicular region with infiltration to surrounding tissues, which was successfully treated by complete surgical excision and postoperative adjuvant radiotherapy. (Korean J Endocrine Surg 2005;5:36-39)
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