Using PC (Personal Computer)-based shells to write an expert assistance for use with the ASPEN (advanced system for process engineering) computer code
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 118 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0957-4174
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✦ Synopsis
A method for evaluating the reliability of real-time systems containing embedded rule-based expert systems is proposed and investigated. It is a three stage technique that addresses the impact of knowledge-base uncertainties on the performance of expert systems. In the first stage, a Markov reliabih'ty model of the system is developed which identifies the key performance parameters of the expert system. In the second stage, the evaluation method is used to determine the values of the expert system's key performance parameters. The performance parameters can be evaluated directly by using a probabilistic model of uncertainties in the knowledge-base or by using sensitivity analyses. In the third and final state, the performance parameters of the expert system are combined with performance parameters for other system components and subsystems to evaluate the reliability and performance of the complete system. The evaluation method is demonstrated in the context of a simple expert system used to supervise the performances of an FDI algorithm associated with an aircraft longitudinal flight-control system.