Auflistung nach Autor:in "Wester-Ebbinghaus, Matthias"
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- KonferenzbeitragAbstractions in actor and activity modeling(Enterprise modelling and information systems architectures (EMISA 2011), 2011) Wester-Ebbinghaus, Matthias; Moldt, DanielIn this paper we argue that actor-centered models are well suited for sociotechnical systems of systems (like enterprise and especially cross-enterprise scenarios). Results can especially be drawn from the field of multi-agent system modeling. However, existing approaches reveal a lack of possibilities for switching between different levels of abstraction. This does not only concern more or less abstract models for a given situation (model abstraction), but also to have models with actors of varying granularity, including individual as well as collective actors (actor abstraction). We present a modeling approach that addresses both these aspects. It is based on the core concepts of actors and activities and especially the concept of a collective actor is emphasized. For supporting different levels of model abstraction, we present multiple modeling techniques. The semantic core of all models is based on high-level Petri nets, although this is hidden for the more abstract models.
- KonferenzbeitragModeling systems of systems as nested actor systems based on petri nets(Modellierung 2010, 2010) Wester-Ebbinghaus, Matthias; Moldt, Daniel; Adameit, SimonModern software systems are frequently characterized as systems of systems. Agentorientation as a software engineering paradigm exhibits a high degree of qualification for addressing many of the accompanying challenges. However, systems of systems demand for means of hierarchical/recursive decomposition that are not inherently rooted in the agent-oriented paradigm. We present a model that still relies on the actor metaphor, but shifts the focus to collective agency. We propose a universal model of a system unit that both embeds system actors and is itself embedded as a collective system actor in surrounding system units. Consequently, we can apply our model of a system unit at arbitrary levels of a system of systems and compose the overall system by means of nested actor hierarchies. (High Level) Petri nets as our modeling technique supply precise operational semantics for the functioning of these kind of systems. In addition, we offer abstraction mechanisms that allow for rather high-level or low-level views and smooth transitions between them.