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Three dimensional model reconstruction of construction machinery involves a large amount of technical problems which affecting the promotion and application in virtual training system. In this work, several key techniques for the model reconstruction of construction machinery in virtual training system are addressed. Firstly the reconstruction method for three views of machine parts is proposed based...
In recent years, the incidence of placenta previa has been increasing. According to the literature, it is mainly related to induced labor, artificial abortion, cesarean section, high aging pregnancy, multipara or smoking. The placenta previa is the chief cause of bleeding in late pregnancy and threatens the lives of mother and infant, resulting in a high risk problem in obstetrics. This article studies...
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