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Research and more

Research and more. Who am I?. B.Sc. Math/Computer Science Hebrew University of Jerusalem, Israel M.Sc. Computer Science Hebrew University of Jerusalem, Israel Ph.D. in Science (Computer Science) Katholieke Universiteit Leuven, Belgium Postdoc at Ecole Polytechnique, France LaQuSo.

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Research and more

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  1. Research and more

  2. Who am I? • B.Sc. Math/Computer Science • Hebrew University of Jerusalem, Israel • M.Sc. Computer Science • Hebrew University of Jerusalem, Israel • Ph.D. in Science (Computer Science) • Katholieke Universiteit Leuven, Belgium • Postdoc at Ecole Polytechnique, France • LaQuSo Background – Recent research – More… / name of department

  3. Background (1997-2004) • Theses: Termination analysis of logic programs • Abstraction techniques in program analysis • But also: • Refactoring in LP [Demoen/Schrijvers/S] • View-usability for queries with aggregation [Cohen/Nutt/Sagiv/S] • XML query languages [Cohen/Kanza/Kogan/Nutt/Sagiv/S] Background – Recent research – More… / name of department

  4. Termination analysis: What is this about? • Undecidable for “interesting languages” • Necessary and sufficient conditions [Dershowitz/Lindenstrauss/Sagiv/S, De Schreye/S] • Sufficient conditions that can be verified automatically [Idem] • Usually: approximations of necessary and sufficient conditions • Often: abstractions or transformations • Interesting decidable sublanguages [Mesnard/S] Algorithms and Tools Background – Recent research – More… / name of department

  5. Background (2005-2006) • Petri nets (modelling and analysis): • Resources • Adaptivity • Termination analysis: • Decidable sublanguages [Mesnard/S] • New approach using TRS [Schneider-Kamp/Giesl/S/Thiemann] • But also: • BKE with μCRL [Bloom/Grote/Mauw/S] • Code stability [Huizing/Kuiper/Punter/S] • Popular papers [Heck/S] / name of department

  6. Resources in Petri nets • Durable and identical resources • Soundness • Whatever the system does… • There is a way to complete the process: and release all resources • Additional resources should not disturb soundness. • Is there a minimal number of resources that ensure soundness for any number of cases? • [Hee/S/Sidorova/Voorhoeve] Algorithm & Tool Background – Recent research – More… / name of department

  7. Adaptivity and workflow Classical workflow: structure is fixed during the design phase Ad-hoc workflow: structure can be modified arbitrarily [vd Aalst et al. 1999] Adaptive workflow: structure can be modified in a structured way • No formal semantics Verification is challenging 2. No reuse of existing WFMS! Structured way: parts of the process can be defined or extended later on… Background – Recent research – More… / name of department

  8. Our solution: Nested Nets … Token is a net! Level 2 Level 1 Analysis is possible using abstractions[Hee/Oanea/S/Sidorova/Voorhoeve/Lomazova] Level 0 Application: medical protocols [Hee/Schonenberg/S/Sidorova/vdWerf] Background – Recent research – More… / name of department

  9. Recent research (2007-2008) • Petri nets (modelling and analysis): • History (global vs. local) • History + adaptivity[Hee/Schonenberg/S/Sidorova/vdWerf] • Mining[vdWerf/vDongen/Hee/Hurkens/S] • Compositionality [Massuthe/S/Sidorova/Wolf] • Improved termination analysis [Schneider-Kamp/Giesl/S/Thiemann] • Framework for automatic verification[Raeds/Petković/S/Somers] • Metrics and Reverse engineering[Petković/vdBrand/S/Korshunova] Background – Recent research – More… / name of department

  10. Recent research: History • Modelling log-based decisions. • Twee models: • Global history (log is accessible for everybody) • Token history (each token has its own past) • Translating history models to classical Petri nets • Analysis • [Hee/S/Sidorova/vd Aalst, Hee/S/Sidorova] Background – Recent research – More… / name of department

  11. Recent research: Termination • LP  TRS; analysis of a TRS • Existing translations: • Restricted to a subclass of LP • Often: LP terminates, TRS – does not! • New translation • New form of rewriting • Provably more powerful than previous transformation-based approaches • [Schneider-Kamp/Giesl/S/Thiemann] Background – Recent research – More… / name of department

  12. Research interests • Static analysis using abstraction techniques • Maintainability • Termination analysis Background – Recent research – More… / name of department

  13. Even more • LaQuSo cases: • ABP 2, Almende, Braunschweig, Cepo, Cordys, De Lage Landen, De Lage Landen 2, Dynafix, M2M, NBG, NBG 2, Oce. • Code analysis • Architecture reviews • Literature study • Requirements elicitation • Certification Background – Recent research – More… / name of department

  14. Example of a LaQuSo case LaQuSo case / name of department

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