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Sökning: swepub > Övrigt vetenskapligt/konstnärligt > Umeå universitet > Linköpings universitet > Naturvetenskap

  • Resultat 1-6 av 6
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  • Drewes, Frank, et al. (författare)
  • Formal Models of Graph Transformation in Natural Language Processing
  • 2015
  • Ingår i: Dagstuhl Reports. - : Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik. - 2192-5283. ; 5:3, s. 143-161
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • In natural language processing (NLP) there is an increasing interest in formal models for processing graphs rather than more restricted structures such as strings or trees. Such models of graph transformation have previously been studied and applied in various other areas of computer science, including formal language theory, term rewriting, theory and implementation of programming languages, concurrent processes, and software engineering. However, few researchers from NLP are familiar with this work, and at the same time, few researchers from the theory of graph transformation are aware of the specific desiderata, possibilities and challenges that one faces when applying the theory of graph transformation to NLP problems. The Dagstuhl Seminar 15122 “Formal Models of Graph Transformation in Natural Language Processing” brought researchers from the two areas together. It initiated an interdisciplinary exchange about existing work, open problems, and interesting applications.
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  • Shukla, Padma, et al. (författare)
  • Letter: Dark and grey electromagnetic electron-cyclotron envelope solitons in an electron-positron magnetoplasma
  • 2009
  • Ingår i: Journal of Plasma Physics. - : Cambridge University Press. - 0022-3778 .- 1469-7807. ; 75:5, s. 575-580
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We present an investigation of the amplitude modulation of an external magnetic field-aligned right-hand circularly polarized electromagnetic electron-cyclotron (EMEC) wave in a strongly magnetized electron-positron plasma. It is shown that the dynamics of the modulated EMEC wave packet is governed by a cubic nonlinear Schrödinger equation. The latter reveals that a modulated wave packet can propagate in the form of either a dark or a grey envelope soliton. This result could have relevance to the transport of electromagnetic wave energy over long distances via envelope solitons in the magnetospheres of pulsars and magnetars.
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  • Brodin, Gert, 1963-, et al. (författare)
  • On the parametric decay of waves in magnetized plasmas
  • 2009
  • Ingår i: Journal of Plasma Physics. - Cambridge UK : Cambridge University Press. - 0022-3778 .- 1469-7807. ; 75, s. 9-13
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We reconsider the theory for three-wave interactions in cold plasmas. In particular, we demonstrate that previously overlooked formulations of the general theory are highly useful when deriving concrete expressions for specific cases. We also pointout that many previous results deduced directly from the basic plasma equations contain inappropriate approximations leading to unphysical results. Finally, generalizations to more elaborate plasma models containing, for example, kinetic effects are given.
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