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  • 1.
    Aceto, Luca
    et al.
    ICE-TCS, School of Computer Science, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland.
    Birgisson, Arnar
    Department of Computer Science and Engineering, Chalmers University of Technology, Sweden.
    Ingolfsdottir, Anna
    ICE-TCS, School of Computer Science, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland.
    Mousavi, Mohammad Reza
    Department of Computer Science, Eindhoven University of Technology, P.O. Box 513, NL-5600 MB Eindhoven, Netherlands.
    Reniers, Michel A.
    Department of Computer Science, Eindhoven University of Technology, P.O. Box 513, NL-5600 MB Eindhoven, Netherlands.
    Rule Formats for Determinism and Idempotence2012In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 77, p. 889-907Article in journal (Refereed)
    Abstract [en]

    Determinism is a semantic property of (a fragment of) a language that specifies that a program cannot evolve operationally in several different ways. Idempotence is a property of binary composition operators requiring that the composition of two identical specifications or programs will result in a piece of specification or program that is equivalent to the original components. In this paper, we propose (related) meta-theorems for guaranteeing the determinism and idempotence of binary operators. These meta-theorems are formulated in terms of syntactic templates for operational semantics, called rule formats. In order to obtain a powerful rule format for idempotence, we make use of the determinism of certain transition relations in the definition of the format for idempotence. We show the applicability of our formats by applying them to various operational semantics from the literature. © 2010 Elsevier B.V. All rights reserved.

  • 2.
    Araujo, Hugo
    et al.
    Universidade Federal de Pernambuco, Recife, PE, Brazil.
    Carvalho, Gustavo
    Universidade Federal de Pernambuco, Recife, PE, Brazil.
    Mohaqeqi, Morteza
    Uppsala University, Uppsala, Sweden.
    Mousavi, Mohammad Reza
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES). University of Leicester, Leicester, UK.
    Sampaio, Augusto
    Universidade Federal de Pernambuco, Recife, PE, Brazil.
    Sound conformance testing for cyber-physical systems: Theory and implementation2017In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 162, p. 35-54Article in journal (Refereed)
    Abstract [en]

    Conformance testing is a formal and structured approach to verifying system correctness. We propose a conformance testing algorithm for cyber-physical systems, based on the notion of hybrid conformance by Abbas and Fainekos. We show how the dynamics of system specification and the sampling rate play an essential role in making sound verdicts. We specify and prove error bounds that lead to sound test-suites for a given specification and a given sampling rate. We use reachability analysis to find such bounds and implement the proposed approach using the CORA toolbox in Matlab. We apply the implemented approach on a case study from the automotive domain. © 2017 The Author(s).

  • 3.
    Beohar, Harsh
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Cuijpers, Pieter
    Department of Mathematics and Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands.
    Avoiding Diamonds in Desynchronisation2014In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 91, no PART A, p. 45-69Article in journal (Refereed)
    Abstract [en]

    The design of concurrent systems often assumes synchronous communication between different parts of a system. When system components are physically apart, this assumption becomes inappropriate. Desynchronisation is a technique that aims to implement a synchronous design in an asynchronous manner by placing buffers between the components of the synchronous design. When queues are used as buffers, the so-called 'diamond property' (among others) ensures correct operation of the desynchronised design. However, this property is difficult to establish in practice. In this paper, we give sufficient and necessary conditions under which a concrete synchronous design (i.e., without the unobservable action) is equivalent to an asynchronous design and formally prove that the diamond property is no longer needed for desynchronisation when half-duplex queues are used as a communication buffer. Furthermore, we discuss how the half-duplex condition can be further relaxed when the diamond property can be partially guaranteed. To illustrate how this theory may be applied, we desynchronise the synchronous systems that are synthesised using supervisory control theory. © 2013 Elsevier B.V.

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    hb-scp-2014
  • 4.
    Beohar, Harsh
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Varshosaz, Mahsa
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Mousavi, Mohammad Reza
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Basic behavioral models for software product lines: Expressiveness and testing pre-orders2016In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 123, p. 42-60Article in journal (Refereed)
    Abstract [en]

    In order to provide a rigorous foundation for Software Product Lines (SPLs), several fundamental approaches have been proposed to their formal behavioral modeling. In this paper, we provide a structured overview of those formalisms based on labeled transition systems and compare their expressiveness in terms of the set of products they can specify. Moreover, we define the notion of tests for each of these formalisms and show that our notions of testing precisely capture product derivation, i.e., all valid products will pass the set of test cases of the product line and each invalid product fails at least one test case of the product line. © 2015 The Authors.

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    fulltext
  • 5.
    Khakpour, Narges
    et al.
    Tarbiat Modares University, Tehran, Iran.
    Jalili, Saeed
    SRI International, Menlo Park, CA, United States.
    Talcott, Carolyn
    Reykjavík University, Reykjavík, Iceland.
    Sirjani, Marjan
    University of Tehran and IPM, Tehran, Iran.
    Mousavi, Mohammad Reza
    Eindhoven University of Technology, Eindhoven, Netherlands.
    Formal modeling of evolving self-adaptive systems2012In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 78, no 1, p. 3-26Article in journal (Refereed)
    Abstract [en]

    In this paper, we present a formal model, named PobSAM (Policy-based Self-Adaptive Model), for developing and modeling self-adaptive evolving systems. In this model, policies are used as a mechanism to direct and adapt the behavior of self-adaptive systems. A PobSAM model is a collection of autonomous managers and managed actors. The managed actors are dedicated to the functional behavior while the autonomous managers govern the behavior of managed actors by enforcing suitable policies. A manager has a set of configurations including two types of policies: governing policies and adaptation policies. To adapt the system behavior in response to the changes, the managers switch among different configurations. We employ the combination of an algebraic formalism and an actor-based model to specify this model formally. Managed actors are expressed by an actor model. Managers are modeled as meta-actors whose configurations are described using a multi-sorted algebra called CA. We provide an operational semantics for PobSAM using labeled transition systems. Furthermore, we provide behavioral equivalence of different sorts of CA in terms of splitting bisimulation and prioritized splitting bisimulation. Equivalent managers send the same set of messages to the actors. Using our behavioral equivalence theory, we can prove that the overall behavior of the system is preserved by substituting a manager by an equivalent one. © 2011 Elsevier B.V. All rights reserved.

  • 6.
    Lengauer, Christian
    et al.
    University of Passau, Germany.
    Taha, Walid
    Rice University, Computer Science, Houston, United States.
    Preface2006In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 62, no 1, p. 1-2Article in journal (Other academic)
  • 7.
    Mousavi, Mohammad Reza
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Pang, Jun
    University of Luxembourg, Luxembourg, Luxembourg.
    Special section on Software Verification and Testing2014In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 95, Part 3, p. 273-274Article in journal (Other academic)
  • 8.
    Mousavi, Mohammad Reza
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Ravara, Antonio
    Department of Informatics, Faculty of Sciences and Technology, New University of Lisbon, Portugal.
    Foreword: Special issue on the 10th International Workshop on the Foundations of Coordination Languages and Software Architectures (FOCLASA 2011)2014In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 89, p. 68p. 1-1Article in journal (Other academic)
  • 9.
    Pelliccione, Patrizio
    et al.
    Dipartimento di Ingegneria e Scienze dell'Informazione e Matematica, Università degli Studi dell'Aquila, L'Aquila, Italy & Chalmers, Gothenburg University, Gothenburg, Sweden.
    Knauss, Eric
    Chalmers, Gothenburg University, Gothenburg, Sweden.
    Ågren, S. Magnus
    Chalmers, Gothenburg University, Gothenburg, Sweden.
    Heldal, Rogardt
    Chalmers, Gothenburg University, Gothenburg, Sweden & Western Norway University of Applied Sciences, Bergen, Norway.
    Bergenhem, Carl
    Qamcom Research & Technology AB, Gothenburg, Sweden.
    Vinel, Alexey
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES). Western Norway University of Applied Sciences, Bergen, Norway.
    Brunnegård, Oliver
    Veoneer Sweden AB, Vårgårda, Sweden.
    Beyond connected cars: A systems of systems perspective2020In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 191, article id 102414Article in journal (Refereed)
    Abstract [en]

    The automotive domain is rapidly changing in the last years. Among the different challenges OEMs (i.e. the vehicle manufacturers) are facing, vehicles are evolving into systems of systems. In fact, over the last years vehicles have evolved from disconnected and “blind" systems to systems that are (i) able to sense the surrounding environment and (ii) connected with other vehicles, the city, pedestrians, cyclists, etc. Future transportation systems can be seen as a System of Systems (SoS). In an SoS, constituent systems, i.e. the units that compose an SoS, can act as standalone systems, but their cooperation enables new emerging and promising scenarios. While this trend creates new opportunities, it also poses a risk to compromise key qualities such as safety, security, and privacy.

    In this paper we focus on the automotive domain and we investigate how to engineer and architect cars in order to build them as constituents of future transportation systems. Our contribution is an architectural viewpoint for System of Systems, which we demonstrate based on an automotive example. Moreover, we contribute a functional reference architecture for cars as constituents of an SoS. This reference architecture can be considered as an imprinting for the implementations that would be devised in specific projects and contexts. We also point out the necessity for a collaboration among different OEMs and with other relevant stakeholders, such as road authorities and smart cities, to properly engineer systems of systems composed of cars, trucks, roads, pedestrians, etc. This work is realized in the context of two Swedish projects coordinated by Volvo Cars and involving some universities and research centers in Sweden and many suppliers of the OEM, including Autoliv, Arccore, Combitech, Cybercom, Knowit, Prevas, ÅF-Technology, Semcom, and Qamcom. © 2020 Published by Elsevier.

  • 10.
    Varshosaz, Mahsa
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Beohar, Harsh
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Mousavi, Mohammad Reza
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Basic Behavioral Models For Software Product Lines: Revisited2018In: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 168, p. 171-185Article in journal (Refereed)
    Abstract [en]

    In Beohar et al. (2016) [9], we established an expressiveness hierarchy and studied the notions of refinement and testing for three fundamental behavioral models for software product lines. These models were featured transition systems, product line labeled transition systems, and modal transition systems. It turns out that our definition of product line labeled transition systems is more restrictive than the one introduced by Gruler, Leucker, and Scheidemann. Adopting the original and more liberal notion changes the expressiveness results, as we demonstrate in this paper. Namely, we show that the original notion of product line labeled transition systems and featured transition systems are equally expressive. As an additional result, we show that there are featured transition systems for which the size of the corresponding product line labeled transition system, resulting from any sound encoding, is exponentially larger than the size of the original model. Furthermore, we show that each product line labeled transition system can be encoded into a featured transition system, such that the size of featured transition system is linear in terms of the size of the corresponding model. To summarize, featured transition systems are equally expressive as, but exponentially more succinct than, product line labeled transition systems. © 2018 Elsevier B.V.

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