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발전기 회전자의 층간단락 센서리스 진단기법 및 특성 해석
김선자(Sun-Ja Kim),전윤석(Yoon-Seok Jeon),이승학(Seung-Hak Lee),최규하(Gyu-Ha Choe) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
Short-circuited can have significant effects on a generator and its performance. One of effective method detecting inter-turn short circuits on round rotor winding is a method using sensor detecting. But the method needs duplicate design of sensor for characteristic change according to types and forms of generator. Thus rotor shorted-turn diagnosis method without sensor is needed for detecting short turn when generator is driven. Diagnosis method without sensor depend on change of electric property in generator. For the reason, this paper presents characteristic analysis of shorted-turns in generator by detecting the output voltage of generator.
임상연구 : 경막외 마취를 이용한 각성하 관상동맥우회술
김진태 ( Jin Tae Kim ),이종환 ( Jong Hwan Lee ),윤승주 ( Seung Zhoo Yoon ),최주연 ( Ju Yeon Choi ),전윤석 ( Yun Seok Jeon ),박재현 ( Jae Hyon Bahk ),김기봉 ( Ki Bong Kim ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.4
Background: Recently, awake coronary artery bypass graft (ACAB) with spontaneous ventilation has been performed under thoracic epidural anesthesia (TEA) without general anesthesia. We report our first experiences of 12 cases of ACAB with full median sternotomy under TEA. Methods: Between March and September 2005, 12 patients underwent ACAB under TEA. The thoracic epidural catheter was placed at the level of T1 and/or T8 vertebral body according to surgical plan. Seven to fifteen milliliter of 2% lidocaine and sufentanil 1.66μg/ml was administered through the epidural catheter. Results: There were 11 male and 1 female patients, aged 67 ± 7 years. In 10 (83.3%) patients, pneumothorax was observed during surgical intervention. During the operation, 5 patients needed to be received general anesthesia because of respiratory distress caused by pneumothorax (n = 3), bowel protrusion (n = 1) or bleeding (n = 1). Mean length of stay in intensive care unit and hospital stay were 1.5 ± 1.2 days and 6.3 ± 1.7 days, respectively. Conclusions: Our initial experience confirms the feasibility of performing ACAB under TEA. However, high rate of conversion to general anesthesia and development of pneumotorax should be considered. Therefore, the actual and potential risks of ACAB under TEA should not be underestimated. (Korean J Anesthesiol 2006; 51: 421~5)
증례보고 : 체외순환 없는 관상동맥 우회술 중 발생한 승모판막 전방이동에 의한 좌심실 유출로 폐쇄로 인한 저혈압
설태경 ( Tai Kyung Seol ),이종환 ( Jong Hwan Lee ),윤승주 ( Seung Zhoo Yoon ),전윤석 ( Yun Seok Jeon ),박재현 ( Jae Hyon Bahk ),김기봉 ( Ki Bong Kim ),김종성 ( Chong Sung Kim ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.53 No.2
Systolic anterior motion of the mitral valve (SAM) is well known in the concentric left ventricular hypertrophy or post mitral valvuloplasty. However, SAM has not been reported in Off-pump coronary artery bypass surgery (OPCAB). Preoperatively, SAM in combination with a left ventricular outflow tract obstruction leads to severe cardiovascular destabilization. Moreover, a diagnosis of SAM is very important because the administration of conventional therapy to hypotension can aggravate SAM. We report a patient with un-identified left ventricular wall hypertrophy or mitral valve regurgitation, who was diagnosed with SAM by TEE during OPCAB. This report describes the diagnostic and therapeutic strategies for the perioperative management of SAM. (Korean J Anesthesiol 2007; 53: 242~5)
임상연구 : 머리의 자세가 우측 쇄골하 중심정맥도관의 위치에 미치는 영향
류호걸 ( Ho Geol Ryu ),이상진 ( Sang Jin Lee ),권정은 ( Jung Eun Kwon ),최주연 ( Ju Youn Choi ),윤승주 ( Seung Zhoo Yoon ),전윤석 ( Yun Seok Jeon ),박재현 ( Jae Hyon Bahk ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.52 No.6
Background: Confirmation of central venous catheter position with chest X-ray is recommended, but frequently omitted in clinical practice. It was suggested that the head posture during right subclavian catheterization affects the incidence of catheter malposition in infants. We evaluated the influence of the head posture on catheter position during right subclavian catheterization in adults. Methods: Two-hundred and seventy four patients scheduled for thoracic or neuro-surgery requiring central venous catheterization were enrolled. Patients were divided into 3 groups depending on the head posture during catheter insertion: the neutral group (n = 109), the turn away group (n = 72), and the turn toward group (n = 93). The catheter position was confirmed with postoperative chest X-ray. Results: Central venous catheterization was failed in 5 patients. There were no differences in the incidence of catheter malposition and the complications among the 3 groups. Conclusions: The head posture during right subclavian catheterization did not affect catheter malposition and immediate complication rates. (Korean J Anesthesiol 2007; 52: 627~9)
증례보고 : 총대동맥활치환술 이후 혈액투석을 받은 환자에서 발생한 헤파린 기인성 혈소판 감소증 -증례보고-
정희진 ( Hee Jin Jeong ),김재광 ( Jae Kwang Kim ),최주연 ( Ju Yeon Choi ),윤승주 ( Seung Zhoo Yoon ),전윤석 ( Yun Seok Jeon ),박경운 ( Kyoung Un Park ),박재현 ( Jae Hyon Bahk ),안혁 ( Hyuk Ahn ),김종성 ( Chong Sung Kim ),김용락 ( 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.50 No.5
Heparin-induced thrombocytopenia (HIT) is an immunologically mediated complication of heparin therapy resulting in the consumption of platelets and a catastrophic thromboembolism. Both the clinical and laboratory features are important for a diagnosis of HIT. There have been 3 case reports of suspected HIT in Korea. However none have satisfied the laboratory features. We experienced a case of HIT, which satisfied both clinical and laboratory features, in a patient who received heparin during continuous veno-venous hemodiafiltration (CVVHD) used to treat acute renal failure that developed after a total aortic arch replacement with a cardiopulmonary bypass. The decreased platelet count and obstruction of extracorporeal filter of CVVHD by the blood clot was observed while receiving unfractionated heparin. The serum from the patient contained the anti heparin-platelet factor 4 antibody, and the condition was thus diagnosed as HIT. Argatroban, which is a direct thrombin inhibitor, was used to treat the thrombosis. (Korean J Anesthesiol 2006; 50: 600~4)