| 1. |
- Mousavi, Mohammad Reza, 1978-, et al.
(författare)
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Timed-Gamma and Its Coordination Language
- 2015
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Ingår i: Nordic Journal of Computing. - Helsinki : University of Helsinki. - 1236-6064. ; 15:2, s. 75-111
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Tidskriftsartikel (refereegranskat)abstract
- This paper proposes a theoretical framework for separation of concerns in the formal specification of reactive and real-time systems. This framework consists of the syntax and the semantics of three languages (and all meaningful combinations thereof) that each address a separate concern. The first language, Gamma (a variant of an existing language) is used to define the functionality of a system (by means of a set of basic data transformations). Our additions are a simple language of intervals specifying timing-properties of basic transformations and a language (called Schedules) for specifying the coordination of the basic Gamma transformations. Each of these languages formally models a separate aspect of a system and statements in these languages can be reused, changed or analyzed in their own right. Our key contribution is that we provide a formal framework in which different combinations of aspects have a well-defined semantics.
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| 2. |
- Aerts, Arend, et al.
(författare)
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A Tool Prototype for Model-Based Testing of Cyber-Physical Systems
- 2015
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Ingår i: Theoretical Aspects of Computing – ICTAC 2015. - Cham : Springer. - 9783319251493 - 9783319251509 ; , s. 563-572
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Konferensbidrag (refereegranskat)abstract
- We report on a tool prototype for model-based testing of cyber-physical systems. Our starting point is a hybrid-system model specified in a domain-specific language called Acumen. Our prototype tool is implemented in Matlab and covers three stages of model-based testing, namely, test-case generation, test-case execution, and conformance analysis. We have applied our implementation to a number of typical examples of cyber-physical systems in order to analyze its applicability. In this paper, we report on the result of applying the prototype tool on a DC-DC boost converter. © Springer International Publishing Switzerland 2015
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| 3. |
- Aerts, Arend, et al.
(författare)
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Model-Based Testing of Cyber-Physical Systems
- 2016
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Ingår i: Cyber-Physical Systems. - Saint Louis : Elsevier. - 9780128038017 ; , s. 287-304
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Bokkapitel (refereegranskat)abstract
- Cyber-physical systems (CPSs) are the result of the integration of connected computer systems with the physical world. They feature complex interactions that go beyond traditional communication schemes and protocols in computer systems. One distinguished feature of such complex interactions is the tight coupling between discrete and continuous interactions, captured by hybrid system models.Due to the complexity of CPSs, providing rigorous and model-based analysis methods and tools for verifying correctness of such systems is of the utmost importance. Model-based testing (MBT) is one such verification technique that can be used for checking the conformance of an implementation of a system to its specification (model).In this chapter, we first review the main concepts and techniques in MBT. Subsequently, we review the most common modeling formalisms for CPSs, with focus on hybrid system models. Subsequently, we provide a brief overview of conformance relations and conformance testing techniques for CPSs. © 2017 Elsevier Inc. All rights reserved.
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| 4. |
- Rashidinejad, Aida, et al.
(författare)
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Supervisory control of discrete-event systems in an asynchronous setting
- 2019
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Ingår i: IEEE International Conference on Automation Science and Engineering. - 2161-8070 .- 2161-8089. ; 2019-August, s. 494-501
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Konferensbidrag (refereegranskat)abstract
- In conventional supervisory control theory, a plant and supervisor are supposed to work synchronously such that enabling an event by the supervisor, execution of it in the plant, and observation of the executed event by the supervisor all occur at once. Therefore, these occurrences are all captured by means of a single event. However, when a supervisor synthesized from conventional supervisory control theory is implemented in real life, it will face problems since exact synchronization can hardly happen in practice due to delayed communications. In this paper, we propose a synthesis technique to achieve a supervisor that does not face the problems caused by inexact synchronization. For this purpose, we first introduce an asynchronous setting in which enablement, execution, and observation of an event do not occur simultaneously but with some delay. We present a model representing the behavior of the plant in the asynchronous setting which we call the asynchronous plant. For the asynchronous plant, we present an algorithm synthesizing an asynchronous supervisor which satisfies (asynchronous) controllability and nonblockingness.
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