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서명국(M. K. Seo),유영철(Y. C. Yoo),이호연(H. Y. Lee),조용근(Y. G. Cho) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.6
An accumulator is used in oil hydraulic system of construction machinery to save energy and reduce a vibration and shock. The use of the accumulator has recently increasing, but the reliability evaluation criteria differs from country to country. So, it is difficult to ensure the reliability whether their performance meet domestic environment and situation. In this study, we introduce the reliability evaluation criteria of the accumulator for construction machinery. Among several type of accumulators, we deal with the diaphragm type accumulator of a small capacity. In order to specify the evaluation criteria of the diaphragm type accumulator, we analyzed the functional requirements of the accumulator and checked the main failure mode of the components. Then, we analyzed KS standards and international standards (ISO, JIS, MIL, and SAE). As a results, we enacted a total of 11 type reliability tests including 4 type comprehensive performance tests, 4 type environmental resistance tests, 2 type stability tests, and a life test.
心臟에 原發한 纖維肉腫 : 症例報告 Report of A Case ana Review of Literature
朴炳文,趙龍根,金湘辰,최인준,全圭坰 中央醫學社 1967 中央醫學 Vol.13 No.4
Malignant tumors primarily in the heart are rare, and moreover fibrosarcoma of heart is of much rare occurrence. In 1700 & 1762, Boneti & Morgagni, at first, reported the primary fibrosarcoma of heart. Mahaim(1945) Collected 329 cases of the tumors of hearts& 84 Cases of the tumors of pericardium, in the literatures, and 87 cases of a total 413 cases were in the heart & 20 cases were also sarcoma in the pericardium. In 1931, Yater reported 10 cases of primary tumors of pericardium. A case of clinically and pathologically diagnosed fibrosarcoma, 49 year-old American female is reported, because of its rare occurrence anb also our first expreience of this type of primary malignant tumor of the heart. Initial symptoms and signs were chest discomfort, anemia and an episode of shock state. She had a history of myopia and thyroidectomy 8 years ago, and of cardiac tamponade 5 months prior to admission. She went to a methodst hospital and was diagnosed by biopsy, fibrosarcoma of Rt. atrium, 5 months prior to admission. Autopsy examination disclosed massively enlarged heart weighing 2,510 gm. The external surface of heart showed shaggy white gray fibrous appearanec of the tumor. The tumor was completely replacing the epicardium, pericardium, both auricles and ventricles, extending to the ascending aorta and myocardium, but not to the endocardium. The tumor tissue was generally grayish white with jelly-like myxoid appearance and hemorrhage. The circumf erences of the valves were; tricuspid, 9.5; mitral, 7.5; aortic, 6. 5 and pulmonic, 6.0 cm. The right lung was also involved, weighing around 1, 010gm., in which the tumor was spreading along the pleural surface, mainly into the interlobular septum and also into the small areas of parenclhynia. The left lung was also involved weighing around 540 gm. and the pleural surface of the diaphragm was also involved. Histopathology of the tumor showed fibrosarcoma with scattered areas of my xornatous degeneration and hemorrhage.