A Modeling Methodology for Scientific Processes
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1 Universität Bayreuth Lehrstuhl für Angewandte Informatik IV Datenbanken und Informationssysteme Prof. Dr.-Ing. Jablonski A Modeling Methodology for Scientific Processes Stefan Jablonski, Bernhard Volz, M. Abdul Rehman Lehrstuhl für Angewandte Informatik IV Fon Universität Bayreuth Fax Fakultät für Mathematik und Physik Bernhard.Volz@uni-bayreuth.de D Bayreuth www
2 Applications in Geology MOD a DB-MOD a IS a DB-IS a IS b MOD b Main characteristica Many, heterogeneous systems involved Data of different quality and format must be exchanged Scientists are part of the applications Key points: Integration of data and human actors DB-IS b DB-MOD b Aspects in integration Technical: Data extraction and exchange (format, protocols) Semantical: Different terminologies and ontologies of data Organizational: Roles and rights of human agents Contribution: Not just another Information System but also a Structured Method Model the application as a process (abstract & concrete) Processes cope with complex application scenarios and can be easily adjusted to changing requirements Processes set up a structural framework that offers possibilities to introduce aspects of data and agent integration Automatically derive applications from these models which execute a process Leverage from existing techniques and methodologies! Existing Systems (Kepler, Taverna etc.) 2 Working, but: Too specific, hard to extend Missing: manual tasks, use of external models (e.g. data model) We criticize the method that stands behind them, not their purpose or use!
3 Solution Overview: Process Driven Architecture (PDA) PDA is a structural framework for Development and customization of modeling methods Development and customization of tool chain (modeling and execution infrastructure) 3
4 Modeling Construct Modeling Construct Modeling Construct Foundation: Perspective Oriented Process Modeling (POPM) Building blocks of a process: Perspectives - Modularization modeling constructs and model Functional perspective - structural composition of a process Behavioral perspective - flow of control in between process steps Data & data flow perspective - data within the process Organizational perspective - responsibilities and roles in the process Operational perspective - tools and applications Our modeling tool i<pm implements the POPM approach; advantages This list is far from being complete/fixed; it can be extended or restricted depending on the individual needs of an application! New modeling elements can be integrated easily; highly customizable Integration of external models (data, organizational, operational) and manual process steps Data integration based on ontologies, etc. Function Function Behavior Behavior Data Data Data Organization Organization Operation Operation i<pm (4GEO) Modeling environment Syntax Syntax Syntax Semantics Semantics Presentation Presentation i<pe Compiler for processes Process specific Execution Process Process specific specific Execution Environment Environment Execution Environment 4
5 Example Simple process involving human actors Color can have a meaning: - Type / kind of data, - Special tasks etc. Integration of external models: - Definition of data (e.g. ER), - Definition of invocation semantics, - Organizational mapping etc. 5
6 Perspectives in the process model (Overview) Operational perspective Functional perspective Organizational perspective Behaviroual perspective (causal dependencies) Data and Data Flow perspective Data source Data sink 6
7 Data Integration: How does it work? Two different "modes": automatic and semi-automatic mapping Depending on the ontologies used Format conversions (not shown) Step A using Ontology A Data Step B using Ontology B B C D E D E Automatic mapping possible if common element found A B A C C Semi-Automatic mapping if no common element found B A C B D A E C F D F E Manually defined correspondence 7
8 Global Scenario: Process Driven Information System for Geology Process Driven Information System for Geology Analysis & Manipulation Im- & Export Processes i<pe Process Enactment Engine Scientific Databases Data Conversion Queries Service (Invocation) Library Meta Repository Knowledge Database Process Library Ontology Transformation Data Storage Client Software i<pm Process Modeling Solution Customized Clients (GIS etc.) Reporting Data Sources External & Interal 8
9 Summary Existing scientific workflow systems provide capabilities to integrate data, but they are too specific Often bound to an application domain Hard to adapt/extend: Special functionality which is often needed cannot be integrated cleanly PDA together with POPM provides this flexibility and extensibility Small amount of actual coding needs to be done, mostly "configuration" Ability to extend the methodology, modeling language and the software tools is part of the method (PDA) and not a feature of one special (sub-)system Example: Modeling construct for classifying data items 9
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