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A TASM-based requirements validation approach for safety-critical embedded systems
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0002-2615-6842
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0002-7366-7186
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0003-0904-3712
2014 (English)In: 19th International Conference on Reliable Software Technologies, Ada-Europe 2014, 2014, 43-57 p.Conference paper, Published paper (Refereed)
Abstract [en]

Requirements validation is an essential activity to carry out in the system development life cycle, and it confirms the completeness and consistency of requirements through various levels. Model-based formal methods can provide a cost-effective solution to requirements validation in a wide range of domains such as safety-critical applications. In this paper, we extend a formal language Timed Abstract State Machine (TASM) with two newly defined constructs Event and Observer, and propose a novel requirements validation approach based on the extended TASM. Specifically, our approach can: 1) model both functional and non-functional (e.g. timing and resource consumption) requirements of the system at different levels and, 2) perform requirements validation by utilizing our developed toolset and a model checker. Finally, we demonstrate the applicability of our approach in real world usage through an industrial case study of a Brake-by-Wire system.

Place, publisher, year, edition, pages
2014. 43-57 p.
Series
Lecture Notes in Computer Science, ISSN 0302-9743 ; 8454
National Category
Computer Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-25695DOI: 10.1007/978-3-319-08311-7_5ISI: 000360100800005Scopus ID: 2-s2.0-84903577705ISBN: 9783319083100 (print)OAI: oai:DiVA.org:mdh-25695DiVA: diva2:734830
Conference
19th International Conference on Reliable Software Technologies, Ada-Europe 2014
Available from: 2014-07-21 Created: 2014-07-18 Last updated: 2015-09-11Bibliographically approved
In thesis
1. An Observer-Based Technique with Trace Links for Requirements Validation in Embedded Real-Time Systems
Open this publication in new window or tab >>An Observer-Based Technique with Trace Links for Requirements Validation in Embedded Real-Time Systems
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

With the growing complexity of embedded real-time systems, requirements validation becomes an ever-more critical activity for developing such systems. Studies have revealed that most of the anomalies, discovered in the development of complex systems, belong to requirement and specification phases. To ease the situation, many efforts have been investigated into the area. Model-based techniques, enabling formal semantics and requirements traceability, are emerging as promising solutions to cost-effective requirements validation. In these techniques, the functional behaviors derived from lower-level requirements are specified in terms of analyzable models at a certain level of abstraction. Further, upper-level requirements are formalized into verifiable queries and/or formulas. Meanwhile, trace links between requirements at various levels of abstraction as well as between requirements and subsequent artifacts (such as verifiable queries and/or formulas, and analyzable models) are built, through which the queries and/or formulas can be fed into the corresponding models. However, such model-based techniques suffer from some limitations, such as how to support semi- or fully-automatic trace links creation between diverse development artifacts, how to ease the demand of heavy mathematics background knowledge to specify queries and/or formulas, and how to analyze models without encountering the state explosion problem. 

 

In this thesis, we cover two aspects centering around requirements validation to ease the aforementioned limitations, which are mainly about requirements traceability and model-based requirements validation. In particular, the technical contributions are four-fold: 1) we have introduced an improved VSM-based requirements traceability creation/recovery approach using a novel context analysis and, 2) we have proposed a lightweight model-based approach to requirements validation by using the Timed Abstract State Machine (TASM) language with newly defined Observer and Event constructs and, 3) we have combined our model-based approach with a restricted use case modeling approach for feature-oriented requirements validation and, 4) we have improved the Observer construct of TASM via proposing a new observer specification logic to facilitate the observer specification, as well as defining the corresponding observer execution process. Finally, we have demonstrated the applicability of our contributions in real world usage through various applications.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2014
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 177
National Category
Embedded Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-25876 (URN)978-91-7485-160-1 (ISBN)
Presentation
2014-10-13, Kappa, Mälardalens högskola, Västerås, 13:15 (English)
Opponent
Supervisors
Available from: 2014-09-05 Created: 2014-09-05 Last updated: 2014-10-06Bibliographically approved

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Citation style
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