From controlled dynamical systems to context-dependent grammars: A connectionist approach

  • Authors:
  • J. F. Martins;J. A. Dente;A. J. Pires;R. Vilela Mendes

  • Affiliations:
  • CTS/UNINOVA, Campus da FCT/UNL, Monte de Caparica, 2829-516 Caparica, Portugal;DEEC-Energia, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;CTS/UNINOVA, Campus da FCT/UNL, Monte de Caparica, 2829-516 Caparica, Portugal;Centro de Fusão Nuclear, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal and CMAF, Complexo Indisciplinar, Universidade de Lisboa, Av. Gama Pinto 2, 1649-003 Li ...

  • Venue:
  • Engineering Applications of Artificial Intelligence
  • Year:
  • 2009

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Abstract

Formal language techniques may be used to study controlled dynamical systems and lead to a formulation in terms of context-dependent grammars. Using automata as basic units we obtain an on-line implementation of the grammars. The implementation has a hierarchical structure, the lowest level dealing with the identification of alphabet symbols (terminal and non-terminal), and the other with the establishment of the grammar productions. The method provides an automatic construction of the automata network from the experimental data. In particular, the parallel-processing capabilities of automata networks improves the performance of grammar-based models for control and anomaly detection in electromechanical devices of industrial relevance. One such example is presented.