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Title
A methodology for model-based verification of safety contracts and performance requirementsPublished Date
2018Publisher
SAGEKeywords
Safety analysisrail system safety
performance modelling
modelling/simulation
life cycle engineering
Abstract
The verification of safety requirements becomes crucial in critical systems where human lives depend on their correct functioning. Formal methods have often been advocated as necessary to ensure the r ... [+]
The verification of safety requirements becomes crucial in critical systems where human lives depend on their correct functioning. Formal methods have often been advocated as necessary to ensure the reliability of software systems, albeit with a considerable effort. In any case, such an effort is cost-effective when verifying safety-critical systems. Often, safety requirements are expressed using safety contracts, in terms of assumptions and guarantees.
To facilitate the adoption of formal methods in the safety-critical software industry, we propose a methodology based on well-known modelling languages such as the unified modelling language and object constraint language. The unified modelling language is used to model the software system while object constraint language is used to express the system safety contracts within the unified modelling language. In the proposed methodology a unified modelling language model enriched with object constraint language constraints is transformed to a Petri net model that enables us to formally verify such safety contracts. The methodology is evaluated on an industrial case study. The proposed approach allows an early safety verification to be performed, which increases the confidence of software engineers while designing the system. [-]
Publisher’s version
https://doi.org/10.1177/1748006X16667328ISSN
1748-006XPublished at
Journal of Risk and Reliability: Proceedings of the Institution of Mechanical Engineers, Part O Vol. 232. Nº3. Pp. 227-247. June, 2018Document type
ArticleVersion
Postprint – Accepted ManuscriptRights
© 2018 SAGE PublicationsAccess
Open AccessCollections
- Articles - Engineering [332]