Dipl.-Math. Michael Reiter

Former Research Associate and Ph.D. Student

Projects

Stuttgart Research Centre for Simulation Technologie und Exzellenz-Cluster "Simulation Technology (SimTech)"

In "SimTech", the IAAS is working on the creation of a workflow management system (WfMS) for modeling and executing simulation workflows. The WfMS will be especially tailored to requirements of scientists. The underlying technical complexity ought to be hidden for scientists to enable them to concentrate on their core competencies.

Results

Runtime for Simulation Workflows

We want to achieve our aim with three tightly coupled projects, each of which dealing with a partial aspect of the WfMS:

  • Modelling of Simulation Workflows
  • Runtime for Simulation Workflows
  • Flexibility of Simulation Workflows

Goal of the project "Runtime for Simulation Workflows":
For scientists requirements such as reliability, availability, scalability or security are important at execution time of simulation workflows. Those requirements correspond with the business requirements for workflows. Hence, I focus on the execution of instances of “conventional workflow systems” for enterprises for example with the help of a BPEL-engine. This contradicts to most of the workflow environments used in the scientific community. In those scientific workflow environments often the workflow model and not an instance is executed. Within my project, conventional workflow systems are adapted to the requirements of scientists: Often the amount of data is bigger, more high-capacity computers are needed, or the operating time of the particular activities is longer than in business processes. Furthermore, integrated functionalities for optimization could reduce both the execution time and the cost of the simulation workflows. An important challenge is to provide applications, frameworks, or libraries as a Web Service that can be used in workflows. In doing so particular steps of the simulation can be controlled by means of a workflow: If the finite element method (FEM) is used, such steps could be the creating of a FEM-grid or the solving of matrix equations. A provenance component provides the traceability of simulations within the workflow environment for not in the simulation involved scientist. Based on monitoring functionality like auditing the provenance component specifies the flow, the used resources, or all essential events in a structured form. Those data are stored automatically and, if required, they will be available for a long term.

Challenges of the project "Runtime for Simulation Workflows":
  • Adaption of conventional Workflow Management Systems
  • Providing of applications, frameworks, and libraries for simulation as Web Services
  • Providing of Resources such as computer systems or data bases
  • Simple and performance oriented handling with huge amounts of data
  • Preparation of workflow information for provenance support

Publications

Book Chapters

  1. Görlach, Katharina; Sonntag, Mirko; Karastoyanova, Dimka; Leymann, Frank; Reiter, Michael: Conventional Workflow Technology for Scientific Simulation. In: Yang, Xiaoyu (Hrsg); Wang, Lizhe (Hrsg); Jie, Wei (Hrsg): Guide to e-Science, Springer-Verlag, 2011 ( pdf).

Journal Papers

  1. Reiter, Michael; Breitenbücher, Uwe; Kopp, Oliver; Karastoyanova, Dimka: Quality of Data Driven Simulation Workflows. In: Journal of Systems Integration. Vol. 5(1), 2014.
  2. Krause, Robert; Allgöwer, Frank; Karastoyanova, Dimka; Leymann, Frank; Markert, Bernd; Mitschang, Bernhard; Reimann, Peter; Reiter, Michael; Schittler, Daniella; Schmitt, Syn; Waldherr, Steffen; Ehlers, Wolfgang: Scientific workflows for bone remodelling simulations. In: Applied Mathematics and Mechanics, WILEY-VCH Verlag, 2013.
  3. Krause, Robert; Schittler, Daniella; Reiter, Michael; Waldherr, Steffen; Allgöwer, Frank; Karastoyanova, Dimka; Leymann, Frank; Markert, Bernd; Ehlers, Wolfgang: Bone remodelling: A combined biomechanical and systems-biological challenge. In: Applied Mathematics and Mechanics, WILEY-VCH Verlag, 2011, pp. 99--100.
  4. Kopp, Oliver; Görlach, Katharina; Karastoyanova, Dimka; Leymann, Frank; Reiter, Michael; Schumm, David; Sonntag, Mirko; Strauch, Steve; Unger, Tobias; Wieland, Matthias; Khalaf, Rania: A Classification of BPEL Extensions. In: Journal of Systems Integration. Vol. 2(4), Online, 2011 (pdf).
  5. Sonntag, Mirko; Görlach, Katharina; Karastoyanova, Dimka; Leymann, Frank; Reiter, Michael: Process Space-based Scientific Workflow Enactment. In: International Journal of Business Process Integration and Management (IJBPIM) Special Issue on Scientific Workflows, Vol 5, No. 1, pp. 32-44, Inderscience Publishers, 2010 ( pdf).

Conference Papers

  1. Reiter, Michael; Breitenbücher, Uwe; Kopp, Oliver; Karastoyanova, Dimka: Quality of Data Driven Simulation Workflows. In: IEEE (Hrsg): 2012 8th IEEE International Conference on eScience. ( pdf).
  2. Reiter, Michael; Dustdar, Schahram; Karastoyanova, Dimka; Krause, Robert; Leymann, Frank; Pahr, Dieter; Truong, Hong-Linh: On Analyzing Quality of Data Influences on Performance of Finite Elements driven Computational Simulations. In: European Conference on Parallel Processing (Euro-Par) 2012 – 18th International Conference, Rhodos, 2012.
  3. Reiter, Michael; Breitenbücher, Uwe; Dustdar, Schahram; Karastoyanova, Dimka; Leymann, Frank; Truong, Hong-Linh: A Novel Framework for Monitoring and Analyzing Quality of Data in Simulation Workflows. In: 2011 Seventh IEEE International Conference on eScience ( pdf).
  4. Reimann, Peter; Reiter, Michael; Schwarz, Holger; Karastoyanova, Dimka; Leymann, Frank: SIMPL - A Framework for Accessing External Data in Simulation Workflows. In: Gesellschaft für Informatik (GI) (Hrsg): Datenbanksysteme für Business, Technologie und Web (BTW 2011), 14. Fachtagung des GI-Fachbereichs „Datenbanken und Informationssysteme“ (DBIS), Proceedings, 02.-04. März 2011, Kaiserslautern, Germany ( pdf).

Workshop Papers

  1. Breitenbücher, Uwe; Kopp, Oliver; Leymann, Frank; Reiter, Michael; Roller, Dieter; Unger, Tobias: Six Strategies for Building High Performance SOA Applications. In: Schönberger, Andreas (Hrsg); Kopp, Oliver (Hrsg); Lohmann, Niels (Hrsg): Proceedings of the 4th Central-European Workshop on Services and their Composition, ZEUS-2012.

Open Thesis

If you're interested in writing your diploma or master thesis in the area of scientific workflows or data quality please mail me. There also may be other topics than the listed ones.