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» Dienste. Algorithmen und Meta Layout müssen den Anwendern zugänglich gemacht werden, damit ein Nutzen daraus entsteht. Dazu müssen wir verschiedenste graphische Frameworks mit vorhandenen Layout-Bibliotheken integrieren und eine Reihe von Werkzeugen entwickeln, mit denen die Verfügbarkeit unserer Lösungen gesteigert wird. Hierzu gehört z.B. die Unterstützung von Standard-Graphenformaten sowie ein Web-Service für automatisches Layout.

  • Evaluate Impact of Reversing Edges on Humans (Master)
    Reversing edges during the layer assignment problem as suggested by the previous topic may have a negative impact on the readability of diagram. User-studies should be carefully planned and conducted to answer two questions: which edges are naturally reversed by humans and does reversing too many edges worsen comprehensibility?
  • Node Placement With a Focus on Compactness (Master)
    Node placement algorithms often try to draw as many edges as straight lines as possible. However, that usually results in less compact diagrams. The focus of this topic would be to devise or adapt a node placement algorithm that tries to strike a balance between straightness and compactness.
  • Interactive Constraint Creation and Application in Automatic Layout (Bachelor, Master)
    Evaluate options how to create constraints on the layout like "Node x should be placed at position y" and how to implement this in the current layout algorithms. Assess how such constraints can be persisted within the model.
  • Force Based Drawing with Port Constraints (Master)
    Develop methods for integrating port constraints in force-based drawing approaches. The resulting node placement shall be evaluated using an edge router such as libavoid on the model library of Ptolemy.


Modeling Pragmatics

Advisors: Reinhard von Hanxleden, Ulf Rüegg, Christoph Daniel Schulze

  • 1 Compound Graph Exploration (Bachelor, Master)
    A new graph exploration approach should be examined which is uses different zoom levels for different compound nodes. This tries to map the "Google Maps approach" of only showing the information of interest at any given zoom level to the field of graph exploration.
  • 1 OpenStreetMap-Based Model Exploration (Bachelor, Master)
    Implement a prototype to investigate whether OpenStreetMap can be used to display custom data (such as, say, rendered diagrams) to use its filtering and exploration features for exploring large diagrams.
  • 3 Control Flow Graph Exploration / Visualization (Bachelor)
    Use pragmatics concepts (automatic layout, focus & context) for exploring/visualizing control flow graphs and specific paths, eg. as computed by OTAWA WCET analysis tool, eg. using KLighD.
  • Generate signal flow graphs from finished module descriptions (Bachelor)
    Use pragmatics concepts to parse YAML data and generate browsable signal flow diagrams for an audio application using KLighD. Might also include building an Xtext-based editor to write the YAML files in the first place and help highlight problems. (In conjunction with sonoware GmbH)Use signal flow graphs for parameterizing / debugging audio system configurations (Master)
    The configuration of how signals are routed and how signal processors are configured in an audio system is a complex task. Make configuration and debugging easier by providing a visualization of the current configuration. Also, research what will help developers and users find configuration problems. The resulting software can be integrated into an existing Python-based configuration application, or be developed as a standalone tool that communicates with the audio system through Ethernet. (In conjunction with sonoware GmbH)


  • Incremental Compilation of SCEst (Bachelor/Master)
    Modify the KIELER SCEst language so that KIELER is able to compile Esterel step-by-step to C via SCL.
    For Master Students: Also add the possibility to compile from SCCharts to SCEst. 
  • eSCL - Implementing gotopause (Bachelor/Master)
    Create an extended dialect of the SC Language including the gotopause statement and implement a transformation to SCL.
  • Quartz (Master)
    Integrate the synchronous Quartz language into KIELER for validation purposes and teaching.

Miscellaneous Topics

Advisors: to be determined.

  • Developing an Info Screen (Bachelor)
    Info screens are screens that present data in ways that can be easily understood. This includes static data (project description graphics, members of a team, ...) as well as dynamically aggregated data (bug statistics, automatic build overviews, ...). This topic is about developing such an info screen for our group and making it easily configurable.
    Developing a domain specific language (DSL) for model railway control (Bachelor/Master)
    We maintain a model railway installation as a demonstrator for our work and as a student teaching tool. Especially for demonstations to non-technical visitors we would like to have a simple language to create controllers for the railway.