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최윤식(Y. S. Choi),한동엽(D. Y. Han),정영득(Y. D. Jeong) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Nowadays, plastic industry has needed to produce parts that require high precision and quality. To make a high precision and quality part, before injection molding, plastic material is investigated about their properties such as shrinkage, warpage, etc. In this study, experiments were conducted with PA6(polyamid) to figure out shrinkage behavior according to three type aspect ratio of samples. The injection speed that affects on shear rate, molecular orientation within plastic part was determined as main variable of experiment. As a result of experimental study, part shrinkage had a tendency to be decreased by increasing injection speed and aspect ratio of samples.
박리성대동맥류에 관한 임상적 관찰 : 진단 및 치료의 최근 현황
김준수,박영배,김성국,전은석,최윤식,이영우 대한내과학회 1986 대한내과학회지 Vol.30 No.3
A retrospective clinical study was done on 37 cases of aortic dissection who had been admitted to Seoul National University Hospital from January, 1981 to June, 1985. 1) Aortic dissection was seen a little more frequently in men than women with M:F ratio of approximately 1.2:1. The peak incidence was in the fifth and sixth decades, with the range being 22 to 77 years of age. Most cases with age of less than 35 were associated with Marfan syndrome, Takayasu's disease, or suspected Behcet's disease. 2) Aortic regurgitation and pulse deficits were important features of proximal dissection, and bruits and pulsating masses were important features of distal dissection. 3) Echocardiography, abdominal ultrasonography, and/or CT scan may be useful screening or diagnostic procedures, before performing aortography. 4) In surgically indicated cases(18 cases), the hospital death rates were 75% in medically treated group(12 cases) and 17% in surgically treated group(6 cases).
박영배,김유호,서정돈,최윤식,이영우,오병희,도문홍,최동주,전은석 대한내과학회 1987 대한내과학회지 Vol.32 No.3
In order to observe the aspects of prosthetic cardiac valve failure, we analyzed 26 cases of Redo operation among 1081 cases of valve replacemant performed from Jan. 1961. to July 1986. The results are as follows; 1) Crude Redo operation rate was 2.4%. 2) The most common cause or prosthetic cardiac valve failure was the primary tissue failure (73%) 8r the PVE was the 2nd (15.4%). 3) Mean valve implantation time was 47.7 months. Implantation time in the child group was shorter than in adult by 6.8 months, In the primary tissue failure group (19 cases) implantation time in the child was 42.8 months 8z in adult, 66.8 months. (P$lt;0.05) In conclusion, the durability of tissue valves was significantly decreased in the child age group because of increased propensity for calcification, so the preference of tissue valves especially in this age group should be reconsidered.