Real-Time Reactions in Supervisory Control According toData Freshness
Real-Time Systems - Special issue on challenges in design and implementation of middlewares for real time systems
Expanding Small Example into Large Scale Real-Time Control System
APSEC '99 Proceedings of the Sixth Asia Pacific Software Engineering Conference
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Plants need both data acquisition without any loss and detection of state changes in restricted times. This paper proposes the Active Ring model for active real-time database systems which acquire data from industrial plants, provide the data for applications, and detect state changes to notify them to applications. The model incorporates the ECA mechanism into circular storage areas. In the ECA mechanism, conditions whose evaluation time is bounded are separated from others. The model is cognizant of data freshness. Since deadlines of transactions are set according to data freshness, the detection is integrated with the real-time acquisition. This paper includes an experimental result revealing that the Active Ring model is effective to provide service according to data freshness.