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Auflistung nach Autor:in "Breuker, Dominic"

1 - 4 von 4
  • Konferenzbeitrag
    Designing and implementing a framework for event-based predictive modelling of business processes
    (Enterprise modelling and information systems architectures - EMISA 2014, 2014) Becker, Jörg; Breuker, Dominic; Delfmann, Patrick; Matzner, Martin
    Applying predictive modelling techniques to event data collected during business process execution is receiving increasing attention in the literature. In this paper, we present a framework supporting real-time prediction for business processes. After fitting a probabilistic model to historical event data, the framework can predict how running process instances will behave in the near future, based on the behaviour seen so far. The probabilistic modelling approach is carefully designed to deliver comprehensible results that can be visualized. Thus, domain experts can judge the predictive models by comparing the visualizations to their experience. Model analysis techniques can be applied if visualizations are too complex to be understood entirely. We evaluate the framework's predictive modelling component on real-world data and demonstrate how the visualization and analysis techniques can be applied.
  • Zeitschriftenartikel
    Developing Graphical Model Editors for Meta-Modelling Tools - Requirements, Conceptualisation, and Implementation
    (Enterprise Modelling and Information Systems Architectures - An International Journal: Vol. 8, Nr. 2, 2013) Dietrich, Hanns-Alexander; Breuker, Dominic; Steinhorst, Matthias; Delfmann, Patrick; Becker, Jörg
    Meta-modelling tools have been proposed to facilitate the development and adoption of domain-specific modelling languages (DSMLs). These languages specify a set of domain-specific concepts and assign diagrammatic representations to them. A considerable amount of work has been done to develop metamodelling tools ensuring syntactical correctness of models created with DSMLs. However, little has been published about the challenges of developing a graphical model editor for meta-modelling tools. Specifying how conceptual elements of a DSML are to be represented graphically is often cumbersome. Moreover, tools are sometimes too inflexible to handle advanced features beyond displaying static icons. Furthermore, graphical representations must be kept consistent in case of reuse in multiple, potentially integrated DSMLs. This paper’s aim is to carve out a set of requirements for graphical model editors as used in meta-modelling tools. We present a conceptual model considering these requirements. Furthermore, we discuss an exemplary software implementation of a model editor.
  • Konferenzbeitrag
    Geld stinkt, Bitcoin auch – Eine Ökobilanz der BitcoinBlock Chain
    (INFORMATIK 2012, 2012) Becker, Jörg; Breuker, Dominic; Heide, Tobias; Holler, Justus; Rauer, Hans Peter; Böhme, Rainer
    Ein modernes, globales Wirtschaftssystem ist ohne elektronisches Geld kaum vorstellbar. In der Regel stellt eine zentrale Kontrollinstanz die Integrität des Zahlungssystems sicher. Mit Bitcoin wurde eine elektronische Währung entwickelt, die die zentrale Instanz durch ein dezentrales, kryptographisches Protokoll ersetzt. In einer öffentlich sichtbaren Block Chain sind sämtliche Transaktionen dokumentiert. Die Teilnehmer eines Peer-to-Peer-Netzwerks wenden zur Erstellung dieser Block Chain eine große Menge Rechenleistung auf. Um die Block Chain zu manipulieren, müsste ein Angreifer dem ebenso viel Rechenleistung entgegensetzen. Die Sicherheit beruht auf der Annahme, dass niemand dazu in der Lage sein wird. Von einigen „Bitcoin-Evangelisten“ wird dies als Chance gefeiert, Transaktionskosten einzusparen und, darauf aufbauend, Finanzinstitute und Regierungen zu entmachten. Dabei ist jedoch alles andere als klar, wie groß die Einsparungen tatsächlich sein könnten (bzw. ob überhaupt gespart werden kann). Da die zur Aufrechterhaltung einer sicheren Block Chain benötigte Rechenleistung mit großem Energiebedarf einhergehen könnte, stellt sich darüber hinaus die Frage nach den Konsequenzen für die Umwelt. Dieser Aufsatz demonstriert anhand einer vorsichtigen, quantitativen Abschätzung, dass die monetären wie ökologischen Kosten der Block Chain durchaus beachtlich seien könnten.
  • Konferenzbeitrag
    Outlining a graphical model query approach based on graph matching
    (Enterprise modelling and information systems architectures - EMISA 2014, 2014) Breuker, Dominic; Dietrich, Hanns-Alexander; Steinhorst, Matthias; Delfmann, Patrick
    This paper outlines a graphical model query approach based on graph matching. It consists of a graphical query specification language and a matching algorithm based on graph matching that takes the query as input and returns all matches found in a model to be searched. The graphical query specification language can be used to draw model queries much like a model would be constructed. To achieve applicability in many different model analysis scenarios, the query approach provides structurally exact and structurally similar pattern matching as well as semantic comparison of model node and edge contents. Following a design science research process, we derive functional requirements for the query language and matching algorithm from the literature, outline its syntax, formally specify its matching principle, and demonstrate its functionality by providing a working prototype implementing previously identified requirements.