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 reports on the averaging effect on prediction errors in the fast automated demand response (FastADR) power curtailment amount calculated by our autoregressive and neural network models for a large number of multi-type office building air-conditioners. Our experiments showed the standard deviation of prediction errors decreased with the number of(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)
Advancement of Energy Management Systems (EMSs) for building facilities is becoming more important for sustainable development. The Service Oriented Architecture (SOA) will be a powerful approach for these systems. Distributed type building air-conditioners, which are dominant in Japan, have many distributed raw state variables required by an EMS. This(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)
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