Chuzo Ninagawa

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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(More)
Real-time, fast demand control is thought to be promising technology to compensate for highly variable renewable energy sources for the smart grid of the future. Recent HVAC(Heating Ventilation and AirConditioning) facilities for buildings (hereinafter airconditioning systems) use sophisticated refrigerant flow control devices and Mitsubishi Heavy(More)
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(More)
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(More)