Accession Number : ADA259891


Title :   A Numerical Technique for the Hierarchical Evaluation of Large, Closed Fault-Tolerant Systems


Descriptive Note : Technical rept. Aug 1988-Aug 1990


Corporate Author : AEROSPACE CORP EL SEGUNDO CA ENGINEERING AND TECHNOLOGY GROUP


Personal Author(s) : Lee Jr ,, D A ; Gillery, G C ; Abraham, J ; Rennels, D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259891.pdf


Report Date : 01 Oct 1989


Pagination or Media Count : 39


Abstract : This report describes a new technique for predicting the reliability of large, closed, fault-tolerant systems that overcomes significant shortfalls inherent in the reliability prediction tools commonly used today by systems developers. This new technique deals effectively with the problems of large state space and the introduction of coverages at all levels in the design hierarchy. A preliminary version of a tool using this technique has been developed that runs efficiently on a personal computer, in terms of both time and required resources. This achievement is made possible through the use of semi-Markov models to model each level in the hierarchy, and an innovative numerical technique which combines the models from any given level for use at the next higher level. The accuracy of the tool has been validated through comparative analytical calculations and Monte Carlo simulations.


Descriptors :   *MATHEMATICAL PREDICTION , *SYSTEMS ANALYSIS , *RELIABILITY(ELECTRONICS) , *FAULT TOLERANT COMPUTING , SIMULATION , PREDICTIONS , COMPUTERS , FAULTS , HIERARCHIES , MICROCOMPUTERS , RESOURCES , ACCURACY , RELIABILITY


Subject Categories : Computer Programming and Software


Distribution Statement : APPROVED FOR PUBLIC RELEASE