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Hidden failure of protection relays is one of the important reasons of cascading failure and disconnection of power systems. It is significant to improve the reliability for protection. So far, the hidden failure remains undetected. An analytic model based on protection signals is proposed to detect hidden failures of protection relays in this paper. In this model, fault location, protection start...
This paper proposes a method to calibrate and position surgical instruments using stereo camera, discusses the calibration error and its propagation when the instrument is positioned. A planar marker composed by X corners is attached to the instrument, and a reference frame is established on the marker. The structural parameter of instrument is calibrated on clinical site by rotating the instrument...
The development of Web services provides a convenient way to achieve various services on web. Web services composition is the key techniques in its application. Composition of Web service is always in a complex and distributed environment so there are many potential problems such as deadlock. To avoid those problems, we first model Web services as finite state machine and discuss the properties of...
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