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In various CNC systems the MCU, servo controllers and sensors all need to be accurately synchronized for time stamping of data and motion control. This paper presents a time synchronization method for CNC systems based on switched Ehternet in which message delay variation through switches must be minimized or compensated to obtain accurate time synchronization. The method uses the switch as the time...
UML state chart is lack of dynamic and temporal semantics defined strictly, so it is difficult to implement formal analysis and verification on the systems described by it. Description Logics (DLs), a formal language of knowledge representations, has very strong ability of representation and deduction, but the traditional DLs can only represent the knowledge about static application domains. Temporal...
The Message Session Relay Protocol (MSRP) is defined by IETF as a session-oriented for instant message, file transfer,remote desktop sharing, whiteboard for telephone conferences and so on. Itpsilas also adopted by IP multimedia subsystem in 3G networks and becoming as important as RTP. So how to make MSRP work well through NATs have been addressed from various aspects. In this paper we propose the...
The grid security infrastructure (GSI) has been accepted as the primary authentication mechanism for the Grid. However the efficiency of the grid system is still required improvement because exchanging certificates and verifying validity are compulsory in the authentication procedure. In this paper, we propose a novel authentication architecture for grid Security (AAGS), which adopts seeded secret...
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