The Hearsay-II Speech-Understanding System: Integrating Knowledge to Resolve Uncertainty
ACM Computing Surveys (CSUR)
Concurrency Control in Distributed Database Systems
ACM Computing Surveys (CSUR)
The notions of consistency and predicate locks in a database system
Communications of the ACM
SIGMOD '81 Proceedings of the 1981 ACM SIGMOD international conference on Management of data
Lisp machine manual
Computer
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The blackboard architecture is a popular structuring framework for expert systems. With this structure, an expert system is built as a collection of knowledge sources which are scheduled by a controller and communicate through a shared data region, called a blackboard. The performance of such a system may be significantly enhanced by the concurrent execution of the knowledge sources. However, introduction of concurrent execution into blackboard systems requires extension of the architecture with new mechanisms for scheduling knowledge source activities, synchronizing knowledge source interactions, and accessing shared data. This paper describes our design for transaction-based facilities supporting parallel execution of knowledge sources in a blackboard system.