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This paper studies an architecture of multi-server Web industrial facility monitoring systems using only commercial-off-the-shelf (COTS) Web browser's existing functionality. First we introduce our original method of background change-of-state (CoS) communication while the user interface is focusing to a currently-connected foreground Web server. The method makes it possible for currently-not-connected...
This paper proposes a new transmission buffer framework for CSMA type control networks for resource-limited networked embedded systems. The unique points of our buffer are prioritized push-out and packet concatenation with limited resources. The effectiveness of our proposed buffer was validated in comparison with a conventional FIFO buffer using our network traffic simulator for CSMA type control...
This paper proposes a network traffic simulation model for BACnet Web service (BACnet/WS) object access of building facility monitoring systems to evaluate the communication performance. The simulation model was verified by experiments using a network traffic emulator. In our simulation study, access times of BACnet/WS for 1000 objects are approximately 5 to 20 times longer than those of BACnet/IP...
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