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P005 - OMER 2001- Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2

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  • Konferenzbeitrag
    A model-based approach for automotive software development
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Braun, Peter; Rappl, Martin
    Integrated model-based specification techniques facilitate the definition of seamless development processes for electronic control units (ECUs) including support for domain specific issues such as management of signals, the integration of isolated logical functions or the deployment of functions to distributed networks of ECUs. A fundamental prerequisite of such approaches is the existence of an adequate modeling notation tailored to the specific needs of the application domain together with a precise definition of its syntax and its semantics. However, although these constituents are necessary, they are not sufficient for guaranteeing an efficient development process of ECU networks. In addition, methodical support which guides the application of the modeling notation must be an integral part of a model-based approach. Therefore we propose the introduction of a so-called 'system model' which comprises all of these constituents. A major part of this system model constitutes the Automotive Modeling Language (AML), an architecture centric modeling language. The system model further comprises specifically tailored modeling notations derived from the Unified Modeling Language (UML) or the engineering tool ASCET-SD or general applicable structuring mechanisms like abstraction levels which support the definition of an AML relevant well-structured development process.
  • Konferenzbeitrag
    UML metamodel extensions for specifying functional requirements of mechatronic components in vehicles
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Petersen, Jörg; Bertram, Torsten; Lapp, Andreas; Knorr, Kathrin; Torre Flores, Pio; Schirmer, Jürgen; Kraft, Dieter; Hermsen, Wolfgang
    Increasing demands concerning safety, economic impact, fuel consumption and comfort result in a growing utilisation of mechatronic components and networking of up to now widely independent systems in vehicles. The development of networked electronic control units (ECU) as the most frequent mechatronic applications contains three core aspects: the development of the (control) functions itself, and their realisation in hardware and software as embedded systems. A co-ordinated, systematic and concurrent function, hardware and software development process including co-engineering and simulation environments requires a detailed specification in early development phases and a formalised description to improve the clearness of these specifications, decrease contradictions and increase information density. The Unified Modeling Language (UML) offers such a formalised description facility. A UML metamodel will be presented used for a mapping of automotive domain specific functional models onto UML models including constraints formalised by Object Constraint Language (OCL) expressions. The model also comprises the specification of functional interfaces together with a hierarchical decomposition of the system. The UML automotive domain models are basis for the system design and architecture and support aspects like re-use, exchangeability, scalability and distributed development. Particular importance is attached to the implementation of the UML model in a commercial tool together with a prototype checker of OCL expressions realised in Java.
  • Konferenzbeitrag
    Model-based design of ECU software – A component-based approach
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Freund, Ulrich; Burst, Alexander
    This paper shows how architecture description languages can be tailored to the design of embedded automotive control software. Furthermore, graphical modeling means are put in an object oriented programming context using classes, attributes and methods. After a survey of typical automotive requirements, an example from a vehicle’s body electronics software shows the component based architecture. Introducing the concepts of component and connector refinement provide means to close the gap between system theoretical modeling and resource constraint embedded programming practice, leading to an object-oriented behavior description on the one hand and to a common middleware on the other.
  • Konferenzbeitrag
    Development of a car seat: A case study using AUTOFOCUS, DOORS, and the Validas Validator
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Braun, Peter; Slotosch, Oscar
    In this paper we describe the modeling process and the resulting model of a typical car seat. The requirements of this seat are documented in [Chr00] which are the input of our process. We used the tools AUTOFOCUS [AF-02], DOORS [Tel02], and Validas Validator [Val02]. Starting with requirements analysis we develop first model fragments. Afterwards the graphical, component oriented approach of AUTOFOCUS is used to model the system. Requirements management and tracing techniques ensure that all requirements are implemented. The model-based core of the development process helps very much for the requirements tracing. The model fragments of the earlier phases can be updated so that tracing information is consistent. Compared to traditional requirements tracing techniques less manual interaction is needed. Beside this the test management is also done based upon the requirements. For relevant requirements test cases are specified. This is done using the AUTOFOCUS notation of Extended Event Traces (EETs) a variant of Message Sequence Charts (MSCs). Afterwards the generated code of the model is tested based upon those test cases. Further validation techniques like simulation, consistency, and determinism checks of the Validas Validator have led to the detection of inconsistencies in the model and in the specification.
  • Konferenzbeitrag
    UML and real-time systems
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Björkander, Morgan
    UML has traditionally been used to specify object-oriented software systems. With its rising popularity, the desire to use it for various vertical domains have grown stronger, and in this paper we focus on requirements from the real-time domain. In particular, we look at how tools and features from the real-time domain have affected the standardization efforts when further developing the next generation of UML, called UML 2.0. As part of the language proper, the primary concern is to cover soft real-time aspects, while hard real-time aspects are handled as part of the Real-Time UML profile, which focuses on mechanisms to support schedulability and performance analysis. This paper focuses on the former aspects, but also touches on the latter aspects. In addition, we examine some of the influences from languages that are normally associated with real-time, such as SDL and UML-RT.
  • Konferenzbeitrag
    UML for embedded real-time systems and the UML-extensions by ARTiSAN software tools
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Korff, Andreas
    Modelling software using the Unified Modelling Language (UML) also for embedded real-time systems (ERS) becomes more and more popular since the complexity of these systems increases as well as the pressure of short time-to-market timescales. These notes will introduce some extensions to the UML notation implemented in the CASE-tool Real-time Studio, their motivation and their integration with the common UML modelling procedures to ensure a complete picture of the embedded system to be developed.
  • Konferenzbeitrag
    OMER-2 workshop Daimler-Chrysler modeling contest – Modeling S-class car seat control with AnyLogic
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Filippov, Alexei; Borshchev, Andrei
    In this paper we give an overview of the car seat model that was developed for Daimler-Chrysler modeling contest in year 2001 and was awarded the 1st prize. We outline the OO UML-RT based modeling approach that was used and the simulation tool AnyLogic that supports it, and discuss their main advantages with respect to automotive area.
  • Konferenzbeitrag
    State machine modeling: From synch states to synchronized state machines
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Herzberg, Dominikus; Marburger, André
    To synchronize concurrent regions of a state machine, the Unified Modeling Language (UML) provides the concept of so-called "synch states". Synch states insure that one region leaves a particular state or states before another region can enter a particular state or states. For some application areas, it is beneficial to synchronize not only regions but also state machines. For example, in data and telecommunications, a pure black box specification of communication interfaces via statechart diagrams gives no adequate means to describe their coordination and synchronization. To circumvent the limitations of the UML, this paper presents the concepts of Trigger Detection Points (TDP) and Trigger Initiation Points (TIP); it allows a modeler to couple state machines. The approach is generic, easy to extend and smoothly fits to the event model of the UML; it could also substitute the more specific concept of synch states.
  • Konferenzbeitrag
    Using UML to model complex real-time architectures􏰀
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Selic, Bran
  • Konferenzbeitrag
    On the real value of new paradigms
    (OMER - Object-oriented Modeling of Embedded Real-Time Systems, GI-Workshops OMER-1 & OMER-2, 2001) Tempelmeier, Theodor
    This is a critical assessment of some of the new paradigms of software engineering. The Unified Modeling Language, the notion of design patterns, and some ideas for future and more advanced modelling elements are investigated. This is done from a practical and theoretical point of view, with a focus on real-time and embedded systems development.