NDLI: Probabilistic analysis of safety-critical adaptive systems with temporal dependences

Content Provider	IEEE Xplore Digital Library
Author	Adler, R. Domis, D.J. Furster, M. Trapp, M.
Copyright Year	2008
Description	Author affiliation: Fraunhofer Inst. Exp. Software Eng. (Adler, R.; Domis, D.J.; Furster, M.; Trapp, M.)
Abstract	Dynamic adaptation means that components are reconfigured at run time. Consequently, the degree to which a system fulfils its functional and safety requirements depends on the current system configuration at run time. The probability of a violation of functional requirements in combination with an importance factor for each requirement gives us a measure for reliability. In the same way, the degree of violation of safety requirements can be a measure for safety. These measures can easily be derived based on the probabilities of possible system configurations. For this purpose, we are introducing a new probabilistic analysis technique that determines configuration probabilities based on Fault trees, Binary Decision Diagrams (BDDs) and Markov chains. Through our recent work we have been able to determine configuration probabilities of systems but we neglected timing aspects . Timing delays have impact on the adaptation behavior and are necessary to handle cyclic dependences. The contribution of the present article is to extend analysis towards models with timing delays. This technique builds upon the Methodologies and Architectures for Runtime Adaptive Systems (MARS) , a modeling concept we use for specifying the adaptation behavior of a system at design time. The results of this paper determine configuration probabilities, that are necessary to quantify the fulfillment of functional and safety requirements by adaptive systems.
Starting Page	149
Ending Page	154
File Size	422918
Page Count	6
File Format	PDF
ISBN	9781424414604
ISSN	0149144X
DOI	10.1109/RAMS.2008.4925786
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-01-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive systems Mars Safety Data structures Boolean functions Software engineering Timing Adaptation model Fault trees Delay delays adaptive systems dependability fault trees cycles
Content Type	Text
Resource Type	Article

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