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)
*1 Air-Conditioner Designing & Engineering Department, Air-Conditioning & Refrigeration Division *2 Manager, Air-Conditioner Designing & Engineering Department, Air-Conditioning & Refrigeration Division *3 Chief Staff Manager, Sales Department, Air-Conditioning & Refrigeration Division *4 Professor, Department of Electrical, Electronic and Computer(More)
Regarding a control network for a building air-conditioning system, signal waveforms on the transmission lines without terminators were calculated and compared with experiments. The calculation predicated the severe distortion in the signal waveform due to line end reflections in the cases of improper line connections such as loops or long branches. DOI:(More)
In the future, Automated Demand Response (ADR) Aggregators will be expected to gather power curtailments as quickly as possible. In this research, the total delay for the ADR aggregation of large-scale building HVAC facilities was evaluated by test-bench experiments. A power curtailment delay model of 100 buildings was constructed by using timeseries data(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)
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)
  • C NINAGAWA
  • The Tohoku journal of experimental medicine
  • 1956
By Chikamasa Ninagawa (蜷川 親 正) From the Department of Physiology, Nagasaki University School of Medicine, Nagasaki (Received for publication, July 20, 1955) It is not long since the evidences of secretion in the plantar sweat glands of rats were given. Ring and Randall1) were the first to study histologically the plantar sweat glands in rats. Further, they(More)