Cyber-physical systems design: transition from functional to architectural models

Normally, the design process of Cyber-Physical Systems (CPSs) starts with the creation of functional models that are used for simulation purposes. However, most of the time such models are not directly reused for the design of the architecture of the target CPS. As a consequence, more efforts than strictly necessary are spent during the CPS architecture design phase. This paper presents an approach called Assisted Transformation of Models (AST), which aims at transforming functional (simulation) models designed in the Simulink environment into architectural models represented in the Architecture Analysis and Design Language. Using AST, designers can perform a smooth transition between these two design phases, with an additional advantage of assuring the coupling between functional and architectural models. The use and benefits of AST are exemplified in the paper in a study devoted to for the design of a typical CPS: an Unmanned Aerial Vehicle.CAPE

compass 3 0

COMPASS (COrrectness, Modeling and Performance of AeroSpace Systems) is an international research effort aiming to ensure system-level correctness, safety, dependability and performability of on-board computer-based aerospace systems. In this paper we present COMPASS 3.0, which brings together the results of various development projects since the original inception of COMPASS. Improvements have been made both to the frontend, supporting an updated modeling language and user interface, as well as to the backend, by adding new functionalities and improving the existing ones. New features include Timed Failure Propagation Graphs, contract-based analysis, hierarchical fault tree generation, probabilistic analysis of non-deterministic models and statistical model checking

A Model-Based Combination Language for Scheduling Verification

International audienceCyber-Physical Systems (CPSs) are built upon discrete software and hardware components, as well as continuous physical components. Such heterogeneous systems involve numerous domains with competencies and expertise that go far beyond traditional software engineering: systems engineering. In this paper , we explore a model-based approach for systems engineering that advocates the composition of several heterogeneous artifacts (called views) into a sound and consistent system model. A model combination Language is proposed for this purpose. Thus, rather than trying to build the universal language able to capture all possible aspects of systems, the proposed language proposes to relate small subsets of languages in order to offer specific analysis capabilities while keeping a global consistency between all joined models. We demonstrate the interest of our approach through an industrial process based on Capella, which provides (among others) a large support for functional analysis from requirements to components deployment. Even though Capella is already quite expressive, it lacks support for schedulability analysis. AADL is also a language dedicated to system analysis. If it is backed with advanced schedulability tools, it lacks support for functional analysis. Thus, instead of proposing ways to add missing aspects in either Capella or AADL, we rather extract a relevant subset of both languages to build a view adequate for conducting schedulability analysis of Capella functional models. Finally, our combination language is generic enough to extract pertinent subsets of languages and combine them to build views for different experts. It also helps maintaining a global consistency between different modeling views

Retrofitting controlled dynamic reconfiguration into the architecture description language MontiArcAutomaton

Component & connector architecture description languages (C&C ADLs) provide hierarchical decomposition of system functionality into components and their interaction. Most ADLs fix interaction configurations at design time while some express dynamic reconfiguration of components to adapt to runtime changes. Implementing dynamic reconfiguration in a static C&C ADL by encoding it into component behavior creates implicit dependencies between components and forfeits the abstraction of behavior paramount to C&C models. We developed a mechanism for retrofitting dynamic reconfiguration into the static C&C ADL MontiArcAutomaton. This mechanism lifts reconfiguration to an architecture concern and allows to preserve encapsulation and abstraction of C&C ADLs. Our approach enables efficient retrofitting by a smooth integration of reconfiguration semantics and encapsulation. The new dynamic C&C ADL is fully backwards compatible and well-formedness of configurations can be statically checked at design time. Our work provides dynamic reconfiguration for the C&C ADL MontiArcAutomaton

Valeurs propres d'operateurs differentiels a coefficients irreguliers

SIGLEINIST T 75051 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Zuwanderungs- und Fluechtlingspolitik Anhoerung von Praktikern aus Behoerden, Verbaenden usw. am 31.10.91

BAFl / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Using Object Oriented Technology to Measure the Software Process

This paper reports on how object oriented concepts and technology have been applied to measure a software process in the ESSI AEFTA (Application Enabler Technology for Factory Automation) application experiment. Measurement is considered as a full scale project consisting of 1) modelling the software process, 2) defining goals for the project, 3) formalizing goals in process measures defined on the process model, 4) designing the technological support for measures (procedures and tools, repository), 5) implementing the technological support, 6) implementing the measurement process and 7) assessing the measurement process, modifying it, if needed. The object oriented (oo) approach has been applied to 1), 4) and 5). The process model is defined using OMT; process measures are defined using a query language to express queries on OMT object models; the repository for measures is obtained by automatic translation of the OMT process model into a set of persistent C++ classes; process measure..

Models of Architecture for DSP Systems

International audienceOver the last decades, the practice of representing digital signal processing applications with formal Models of Computation (MoCs) has developed. Formal MoCs are used to study application properties (liveness, schedulability, parallelism...) at a high level, often before implementation details are known. Formal MoCs also serve as an input for Design Space Exploration (DSE) that evaluates the consequences of software and hardware decisions on the final system. The development of formal MoCs is fostered by the design of increasingly complex applications requiring early estimates on a system's functional behavior. On the architectural side of digital signal processing system development, heterogeneous systems are becoming ever more complex. Languages and models exist to formalize performance-related information of a hardware system. They most of the time represent the topology of the system in terms of interconnected components and focus on time performance. However, the body of work on what we will call Models of Architecture (MoAs) in this chapter is much more limited and less neatly delineated than the one on MoCs. This chapter proposes and argues a definition for the concept of an MoA and gives an overview of architecture models and languages that draw near the MoA concept