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Equipe de recherche NOVALTIS

NOVel ALgorithms and VALidation Techniques for TIme-critical and high Integrity Systems

  • Responsable : Gerard Le_lann
  • Centre(s) de recherche : CRI de Paris
  • Domaine : Systèmes communicants
  • Thème : Systèmes embarqués et mobilité

Présentation de l'équipe

Background & Objectives:

NOVALTIS builds upon project REFLECS. New challenges are:

(A1) Models and Algorithms

  • Safety and liveness: To explore most extreme asynchronous computational/system models, to specify and prove distributed algorithms in such models aimed at solving agreement problems in distributed fault-tolerant computing, while circumventing impossibility results (research on the Theta-model)
  • Timeliness and asynchrony: To examine how to use purely asynchronous (time-free) algorithms or partially synchronous algorithms for solving problems in distributed real-time computing, where strict timeliness properties must be proven to hold (research on the design immersion principle)
  • Timeliness and overloads: To investigate scheduling problems (algorithms, schedulability analyses, feasibility conditions) that arise with timeliness/scheduling attributes more complex than constant deadlines, assuming overloads are normal conditions (research on time utility function (TUF)-driven schedulers)
  • Composed safety, liveness, timeliness and dependability: To devise, specify, and prove algorithms directed at endowing a distributed computing system with a specific combination of safety, liveness, timeliness, and dependability properties (research drawing from multiple disciplines, such as, e.g., Concurrency Control, Serializability theory, Distributed Algorithms, Scheduling theory)
(A2) Proof-Based System Engineering (PBSE)
  • To address issues arising with the early phases in a project lifecycle (application requirement capture, system design and forward validation), for systems bound to meet specified properties very high coverage
  • To investigate how to maintain a continuous chain of proofs, from application requirement capture to implementation of a validated system-solution
  • To introduce system-level proof obligations in system engineering methods used for real projects, notably proofs of combined safety, liveness, dependability, and timeliness properties
  • To blend together scientific rigor (proof obligations) and reality (proof assumptions, design assumptions, must be shown to be provably correctly implemented - not discarded as being "engineering/implementation details")
  • To contribute to the development of PBSE tools
(A3) Analyses of causes of mishaps or failures:
  • To examine documented cases of mishaps, quasi-failures or failuresexperienced with projects (before system deployment) and with deployed critical systems
  • To identify causes of difficulties, with a special focus on system engineering faults
  • Contributions to the safety-critical forum (moderated by York University, UK).

Axes de recherche

Scientific areas:

  • (A1) System-level algorithms, specifications and proofs: Research on computational/system models and distributed algorithms for critical computing systems where combined safety, liveness, timeliness & dependability properties must be predicted
  • (A2) System-level engineering methods: Research on proof-based system engineering (PBSE) methods directed at critical and/or complex computer-based applications and systems
  • (A3) Analyses of causes of mishaps or failures: Diagnoses of real causes of difficulties experienced with projects (time/budget overruns, cancellations) and with deployed critical systems (failures or quasi-failures)

Major application domains (2005):

Defense (all forces), Aerospace (deep space exploration, earth orbiting vehicles, autonomous systems).

Relations industrielles et internationales

Established partnership with academia (2005):

  • Vienna University of Technology, Austria
  • Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
  • Virginia Tech, USA
Established partnership with industry (2005):
  • DGA (French MoD)
  • Members of the European Integrated Project ASSERT (Automated Proof-Based System & Software Engineering for Real-Time Systems, 2004-2007): ESA (European Space Agency), EADS-ST, Dassault Aviation, EADS-Astrium, Alcatel Space, Alenia, Axlog Ingénierie, CS
  • Safran
  • MITRE Corp., USA

Mots-clés : Distributed algorithms Distributed systems Fault-tolerance

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