Dominique Méry

J Paul Gibson, Dominique Méry

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.

Régine Laleau, Dominique Méry, Shin Nakajima et al.

This volume contains the joint proceedings of IMPEX 2017, the first workshop on Handling IMPlicit and EXplicit knowledge in formal system development and FM&MDD, the second workshop on Formal and Model-Driven Techniques for Developing Trustworthy Systems (FM&MDD) held together on November 16, 2017 in Xi'an, China, as part of ICFEM 2017, 19th International Conference on Formal Engineering Methods. IMPEX emphasises mechanisms for reducing heterogeneity of models induced by the absence of explicit semantics expression in the formal techniques used to specify these models. More precisely, the meeting targets to highlight the advances in handling both implicit and explicit semantics in formal system developments. The aims of FM&MDD are to advance the understanding in the area of developing and applying formal and model-driven techniques for designing trustworthy systems, to discuss the emerging issues in the area, to improve the dialog between different research communities and between academia and industry, to discuss a roadmap of the future research in the area and to create a forum for discussing and disseminating the new ideas and the research results in the area