Explicit Modelling of Physical Measures: From Event-B to Java

J Paul Gibson
(Télécom Sud Paris, Evry,france)
Dominique Méry
(LORIA, Telecom Nancy, Université de Lorraine, Vandœuvre-lès-Nancy, France)

The increasing development of cyber-physical systems (CPSs) requires modellers to represent and reason about physical values. This paper addresses two major, inter-related, aspects that arise when modelling physical measures. Firstly, there is often a heterogeneity of representation; for example: speed can be represented in many different units (mph, kph, mps, etc. . . ). Secondly, there is incoherence in composition; for example: adding a speed to a temperature would provide a meaningless result in the physical world, even though such a purely mathematical operation is meaningful in the abstract. These aspects are problematic when implicit semantics - concerned with measurements - in CPSs are not explicit (enough) in the requirements, design and implementation models. We present an engineering approach for explicitly modelling measurements during all phases of formal system development. We illustrate this by moving from Event-B models to Java implementations, via object oriented design.

In Régine Laleau, Dominique Méry, Shin Nakajima and Elena Troubitsyna: Proceedings Joint Workshop on Handling IMPlicit and EXplicit knowledge in formal system development (IMPEX) and Formal and Model-Driven Techniques for Developing Trustworthy Systems (FM&MDD) (IMPEX 2017 and FM&MDD 2017), Xi'An, China, 16th November 2017, Electronic Proceedings in Theoretical Computer Science 271, pp. 64–79.
Published: 12th May 2018.

ArXived at: http://dx.doi.org/10.4204/EPTCS.271.5 bibtex PDF
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