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급성 하벽심근경색증에 동반된 ST 절의 상호 하강 ( V₁ - V₃ ) 에 대한 연구
류혜영(Hyae Young Lew),윤용선(Yong Sun Yun),강흥선(Heung Sun Kang),조정휘(Chung Whee Choue),김권삼(Kwon Sam Kim),김명식(Myung Shick Kim),송정상(Jung Sang Song),배종화(Jong Wha Bae) 대한내과학회 1997 대한내과학회지 Vol.53 No.3
N/A Background: Reciprocal ST-segment depression in precordial leads is a common finding in acute inferior myocardial infarction. The responsible mechanism and the significance of this finding, however, are still controversial. Methods: From January 1991 to December 1994, 38 patients with acute inferior myocardial infarction were treated at the Department of Internal Medicine in Kyung Hee University Hospital. Clinical characteristics, serial electrocardiograms, and angiographic findings of coronary artery and left ventriculography, echocardiography were reviewed. Reciprocal ST-segment depression was defined as ST-segment depression≥1.0mm in two or more adjacent precordial leads(V₁-V₃) in patients with acute inferior myocardial infarction showing ST-segment elevation in II, III, aVF. Coronary angiography and echocardiography were performed within 24 hours from admission. In this study, angiographic distribution score was used to define the perfusion territory causing inferior ischemia. Results : 1) The summation of ST-segment elevation in II, III, aVF leads was significantly more higher in group H than group A (P<0.05). 2) However, the angiographic distribution score, peak CK levels, in-hospital complications and ejection fraction showed no difference between two groups (P>0.05). 3) There were no evidence of anterior wall motion abnormality in two groups. Conclusions: Our results suggest that the S'I'- segment depression on the precordial leads in acute myocardial infarction can be explained mainly by benign reciprocal electrical change.
CNC 선반용 알루미늄 파워척의 신뢰성 평가에 관한 연구
이종배(Jong Bae Lee),양희선(Hui Sun Yang),성백주(Baek Ju Sung),윤용선(Yong Sun Yun) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Power chucks for CNC lathes are used to stably grip the workpiece. This component is mainly operated by a hydraulic driven rotating cylinder. Additionally, it must to have a wide range of use according to the material, shape, processing location, and the accuracy of the workpiece in order to respond sufficiently to the various changes in the cutting conditions. In particular, during high-speed milling, a strong grip to prevent the slip and release of the workpiece is required. In order to increase the dynamic performance and stability of the main axis system it is necessary to reduce the weight of the chuck attached to the spindle tip end as much as possible. aluminum chucks are consisted of aluminum materials for 70% of the weight of body. And it is insterted into the steel reinforcements(insert) in the vulnerable parts during operation. However,it has occurred the problem such as wear failure, fatigue failure, and damage by the overload or shock according to various cutting conditions and operating time of field. In this paper, the cause of field failures and potential failure element are analyzed, and after figuring out the current problems for aluminum chucks, proposed a reliability evaluating technique for improving reliability of aluminum chucks for CNC lathes.
김진우,최영길,김영설,양인명,우정택,이승호,홍승재,윤용선,이정환,김덕윤,김성운 대한내분비학회 1997 Endocrinology and metabolism Vol.12 No.2
Multiple endocrine neoplasia type2a(MEN type2a) is a dominantly inherited cancer syndrome which is characterized by medullary thyroid carcinoma, pheochromocytoma and parathyroid hyperplasia or adenoma. Recent reports show that DNA analysis will be introduced into screening of MEN type2a families. Regular prospective screening and appropriate surgical intervention can reduce the morbidity and mortality due to MEN type2a. We experienced a case of MEN type 2a in a 46-year-old female patient. She had undergone bilateral adrenalectomy due to pheochromocytoma, followed by a total radical thyroidectomy, which revealed medullary thyroid carcinoma of the both thyroid gland and parathyroid hyperplasia. (J Kor Soc Endocrinol 12:328-337, 1997)