Time Properties Dedicated Transformation from UML-MARTE Activity to Time Petri Net

Critical Real-Time Embedded Systems (RTES) have strong requirement regarding system's reliability. UML and its pro- file MARTE are standardized modeling language that are getting widely accepted by industrial designers to cope with the development of complex RTES. Relying on Model-Driven Engineering (MDE), critical time properties' verification in UML-MARTE model at early phases of the system lifecycle becomes possible. However, many challenges still exist. A key challenge is to eliminate the gap between UML semi- formal semantics and fully formal executable semantics us- ing model transformation. The model transformation must ensure on the one hand the consistency between high-level user dedicated models and lower-level verification dedicated ones, and on the other hand that the subsequent verification is not too expensive and can be applied to real size industrial models. This paper presents an approach to translate UML- MARTE Activity Diagrams to Time Petri Net (TPN) with the aim of verifying efficiently time properties. This work is under the framework of the UML-MARTE Model Checker which is dedicated to verifying time properties (synchroniza- tion, schedulability, boundedness, WCET, etc.) in RTES. This contribution focuses on how to define the TPN formal semantics to avoid the core problem of state space explosion in model checking. The proposed method is validated using a representative case study. Experimental results are given that demonstrate the method's performance

Exploring AADL verification tool through model transformation

International audienceArchitecture Analysis and Design Language (AADL) is often used to model safety-critical real-time systems. Model transformation is widely used to extract a formal specification so that AADL models can be verified and analyzed by existing tools. Timed Abstract State Machine (TASM) is a formalism not only able to specify behavior and communication but also timing and resource aspects of the system. To verify functional and nonfunctional properties of AADL models, this paper presents a methodology for translating AADL to TASM. Our main contribution is to formally define the translation rules from an adequate subset of AADL (including thread component, port communication, behavior annex and mode change) into TASM. Based on these rules, a tool called AADL2TASM is implemented using Atlas Transformation Language (ATL). Finally, a case study from an actual data processing unit of a satellite is provided to validate the transformation and illustrate the practicality of the approach

Performance Analysis of Live-Virtual-Constructive and Distributed Virtual Simulations: Defining Requirements in Terms of Temporal Consistency

This research extends the knowledge of live-virtual-constructive (LVC) and distributed virtual simulations (DVS) through a detailed analysis and characterization of their underlying computing architecture. LVCs are characterized as a set of asynchronous simulation applications each serving as both producers and consumers of shared state data. In terms of data aging characteristics, LVCs are found to be first-order linear systems. System performance is quantified via two opposing factors; the consistency of the distributed state space, and the response time or interaction quality of the autonomous simulation applications. A framework is developed that defines temporal data consistency requirements such that the objectives of the simulation are satisfied. Additionally, to develop simulations that reliably execute in real-time and accurately model hierarchical systems, two real-time design patterns are developed: a tailored version of the model-view-controller architecture pattern along with a companion Component pattern. Together they provide a basis for hierarchical simulation models, graphical displays, and network I/O in a real-time environment. For both LVCs and DVSs the relationship between consistency and interactivity is established by mapping threads created by a simulation application to factors that control both interactivity and shared state consistency throughout a distributed environment