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Träfflista för sökning "WFRF:(Jakobsson Stefan) srt2:(2005-2009)"

Sökning: WFRF:(Jakobsson Stefan) > (2005-2009)

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1.
  • Bergman, Stefan, et al. (författare)
  • Smärta vid artros
  • 2007
  • Ingår i: Långvarig smärta. - 9789144019741 ; , s. 145-145
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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  • Edelvik, Fredrik, 1972, et al. (författare)
  • An improved method for dipole modeling in EEG-based source localization
  • 2009
  • Ingår i: International Federation for Medical and Biological Engineering Proceedings. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 1680-0737. - 9783642038884 ; 25:9, s. 146-149
  • Konferensbidrag (refereegranskat)abstract
    • The inverse problem in EEG-based source localizationis to determine the location of the brain sources that areresponsible for the measured potentials at the scalp electrodes.The brain sources are usually modeled as current dipoles whichlead to a singularity in the right-hand side of the governing Poisson’sequation. Subtraction methods have been proposed as aremedy and in this paper an improved subtraction method formodeling the dipoles is presented. The accuracy is demonstratedfor radial and tangential sources in layered sphere models and isto the best of the authors’ knowledge superior to previous methodsfor superficial sources. An additional advantage is that itproduces a right hand side with few non-zeros which is beneficialfor efficient solution of the inverse problem.
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  • Stjernman, Anders, et al. (författare)
  • Multi-Objective Optimization of MIMO Antenna Systems
  • 2009
  • Ingår i: Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on. - 9781424447534 ; , s. 1758 -1762
  • Konferensbidrag (refereegranskat)abstract
    • This paper discusses the use of multi-objective optimization in the context of designing a dual antenna system for diversity reception or MIMO communication on a mobile platform in the recently released communication band 750-800 MHz. The performance of such systems is highly dependent on the received signal levels and also on the correlation between the signals. Also, from a radio-engineering point of view, there are limitations on the S-parameters of the design. Further, the antennas also need to share space with other devices on the platform, which adds requirements on the size of the antennas. All these aspects often lead to conflicting requirements, which traditionally are dealt with in the optimization by weighting the different requirements into a single requirement. That approach has several disadvantages including that no trade-off discussion between the different requirements can be made. Multi-objective optimization avoids these disadvantages and has the benefit that the decision of optimal design is made by the antenna engineer then all possibilities and limitations are known.
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