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Träfflista för sökning "WFRF:(Larsson Mikael) srt2:(1990-1994)"

Search: WFRF:(Larsson Mikael) > (1990-1994)

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1.
  • Larsson, Mikael, 1963-, et al. (author)
  • Optical properties of diffractive, bifocal intraocular lenses
  • 1991
  • In: Ophthalmic Lens Design and Fabrication, SPIE 1529(Societ of Photo-Optical Engineers, Bellingham WA, 1991).. - Bellingham WA. ; , s. 63-70
  • Conference paper (peer-reviewed)abstract
    • The resolution of diffractive, bifocal intraocular lenses was studied with regard to pupil displacement and diameter size through computer simulations, bench measurements and patient vision acuity measurements. Good agreement was obtained between these three methods of investigation. In particular we find that pupil displacements of the order of 1 mm reduce the resolution considerably for these lenses.
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2.
  • Larsson, Torbjörn, et al. (author)
  • A Lagrangean heuristic for the capacitated concave minimum cost network flow problem
  • 1994
  • In: European Journal of Operational Research. - : Elsevier BV. - 0377-2217 .- 1872-6860. ; 78:1, s. 116-129
  • Journal article (peer-reviewed)abstract
    • We propose a heuristic solution technique for the capacitated concave minimum cost network flow problem based on a Lagrangean dualization of the problem. Despite its dual character the algorithm guarantees the generation of primal feasible solutions which are local optima and therefore candidates of being the global optimum. The Lagrangean dual is solved by a subgradient search procedure and provides a lower bound to the optimal value. The lower bound is, in general, stronger than the one obtained by a linear approximation of the original problem. It can be used as a judgement of the quality of the solution or in a branch and bound procedure. Computational results from randomly generated problems are presented
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