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김대웅,우용환,박태현 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2
This study is to analysize critical gap by kinds of vehicle, the most important factor, among serveral factors, 'Traffic Volumes in the Opposite Direction', 'Permitted Left Turn Critical Gap', and 'Signal Rate of Green Time', that have an effect upon capacity at crosssections where permitted left turn is permitted through probit analysis after looking over an existing study on permitted left turn capacity, and to calculate permitted left turn capacity on the basis of the above result. In case that the existing model was similar in distance of left turn moving among places where permitted left-turn was allowed, matter of critical gap unresolved exactly was investigated with the vehicle-interval time of the opposite vehicle by kinds of vehicle through analysis of behavioral characteristic, and after calculating each critical gap through probit analysis, the capacity of permitted left trun was calculated by applying to the capacity model of permitted left trun.
정영기,유정한,우용환 대한골절학회 1989 대한골절학회지 Vol.2 No.2
Since the documentation of bone graft techniques by Walther in 1820, it has been used widely for the treatment of nonunion, and bone defect due to osteomyelitis, neoplasm, or trauma, and for arthrodesis. But many problems are still remained in the treatment of the extensive bone defect. Therefore, various techniques have evolved to conventional autogenous graft, fresh allograft bone transplantation, or free vascularized bone graft. According to Dell P.C. et al., the vascularized grafts were transiently stronger than the conventional rionvascularized ones at six weeks postoperatively because of the differences in the repair mechanisms but thereafter there were no appreciable differences. Therefore, except an inadequate soft tissue bed such as in a chronically infected nonunion, a congenital pseudarthrosis, and a previously irradiated or heavily scarred soft tissue bed, we expect gocd result with conventional nonvascularized fibular graft when there is a segmental bone defect less than 12cm, and/or inadequate fascilities for the microvascular surgery. The four patients with the segmental defect of long bone were treated with conventional nonvascularized fibular graft at Kang Nam Sacred Heart Hospital between July 1980 and October 1988, and are reported with reviews of literatures.
정영기,송백용,우용환 대한골절학회 1989 대한골절학회지 Vol.2 No.2
Major fractures and dislocations of the talus are uncommon, but the management of this fracture and of the complications is difficult. The results of treatment of this fracture as a whole are generally poor. This is mostly due to frequent complications such as avascular necrosis of the talus. The authors analyzed the 13 cases of the talus fracture and evaluated the results. We obtained the following results; l. In final results, 3 cases were excellent, 4 cases were goad, 3 cases were fair and 2 cases were poor. 2. Avascular necrosis of the talar body occurred in 4 cases of all fractures. 3. Other complications were arthrofibrosis, subtalar arthritis, infection and dorsal exostosis of the talar neck.