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Diagnosability under Weak Fairness

Lookup NU author(s): Vasileios Germanos, Dr Victor Khomenko

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Abstract

In partially observed Petri nets, diagnosis is the task of detecting whether the given sequence of observed labels indicates that some unobservable fault has occurred. Diagnosability is an associated property of the Petri net, stating that in any possible execution, an occurrence of a fault can eventually be diagnosed. In this article, we consider diagnosability under the weak fairness (WF) assumption, which intuitively states that no transition from a given set can stay enabled forever - it must eventually either fire or be disabled. We show that a previous approach to WF-diagnosability in the literature has a major flaw and present a corrected notion. Moreover, we present an efficient method for verifying WF-diagnosability based on a reduction to LTL-Xmodel checking. An important advantage of this method is that the LTL-X formula is fixed - in particular, the WF assumption does not have to be expressed as a part of it (which would make the formula length proportional to the size of the specification), but rather the ability of existing model checkers to handle weak fairness directly is exploited.


Publication metadata

Author(s): Germanos V, Haar S, Khomenko V, Schwoon S

Publication type: Article

Publication status: Published

Journal: ACM Transactions on Embedded Computing Systems

Year: 2015

Volume: 14

Issue: 4

Print publication date: 01/12/2015

Acceptance date: 29/09/2015

ISSN (print): 1539-9087

ISSN (electronic): 1558-3465

Publisher: ACM Press

URL: http://dx.doi.org/10.1145/2832910

DOI: 10.1145/2832910

Notes: Special Issue on Best Papers from ACSD'12


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