The architecture of an active database management system
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Real-time data acquisition at mission control
Communications of the ACM
Issues in real-time data management
Real-Time Systems - Special issue: real-time databases
Distributed and Parallel Databases - Special issue: Research topics in distributed and parallel databases
Scheduling Algorithms for Multiprogramming in a Hard-Real-Time Environment
Journal of the ACM (JACM)
Integrating temporal, real-time, an active databases
ACM SIGMOD Record
Supervisory Control and Data Acquisition
Supervisory Control and Data Acquisition
Synchronization in Real-Time Systems: A Priority Inheritance Approach
Synchronization in Real-Time Systems: A Priority Inheritance Approach
Temporal and Real-Time Databases: A Survey
IEEE Transactions on Knowledge and Data Engineering
Maintaining Temporal Consistency: Pessimistic vs. Optimistic Concurrency Control
IEEE Transactions on Knowledge and Data Engineering
Priority assignment in real-time active databases
The VLDB Journal — The International Journal on Very Large Data Bases
Supporting predictability in real-time database systems
RTAS '96 Proceedings of the 2nd IEEE Real-Time Technology and Applications Symposium (RTAS '96)
A semantic-based concurrency control protocol for real-time transactions
RTAS '96 Proceedings of the 2nd IEEE Real-Time Technology and Applications Symposium (RTAS '96)
Active Transactions Integrated with Real-Time Transactions According to Data Freshness
RTAS '97 Proceedings of the 3rd IEEE Real-Time Technology and Applications Symposium (RTAS '97)
Pattern refinement with model data fusion to predict exchange rate movement
Design and application of hybrid intelligent systems
Robotics and Autonomous Systems
| Hi-index | 0.00 |
Supervisory control systems in plants mustacquire data without any loss and react for state changes. Someof state change should be reacted in a real-time manner, whileothers may be notified in a best-effort manner. To implementa middleware which works as a server in supervisory control systemsin an acceptable cost, we value the data freshness which meanshow much time has passed from the occurrence of the data. Inthis paper, we present the Active Ring model whichincorporates the ECA mechanism into circular areas. With rulesusing only the latest data, the ECA mechanism realizes time-criticalreactions as firm real-time tasks. In addition to that, the rulestrigger best-effort notification which is realized as a softreal-time task. The middleware works in numerous plants for steelmill, water purifying, and tunnel ventilation. This paper includesan experimental result revealing that the ActiveRing model is effective to provide service according to the datafreshness.