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Träfflista för sökning "WFRF:(Persson Anders) ;spr:eng;srt2:(2005-2009)"

Sökning: WFRF:(Persson Anders) > Engelska > (2005-2009)

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51.
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54.
  • Dessmark, Anders, et al. (författare)
  • On the approximability of maximum and minimum edge clique partition problems
  • 2007
  • Ingår i: International Journal of Foundations of Computer Science. - 0129-0541. ; 18:2, s. 217-226
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider the following clustering problems: given an undirected graph, partition its vertices into disjoint clusters such that each cluster forms a clique and the number of edges within the clusters is maximized (Max-ECP), or the number of edges between clusters is minimized (Min-ECP). These problems arise naturally in the DNA clone classification. We investigate the hardness of finding such partitions and provide approximation algorithms. Further, we show that greedy strategies yield constant factor approximations for graph classes for which maximum cliques can be found efficiently.
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55.
  • Dessmark, Anders, et al. (författare)
  • On the approximability of maximum and minimum edge clique partition problems
  • 2006
  • Ingår i: Conferences in Research and Practice in Information Technology Series. - 1920682333 ; 168, s. 101-105
  • Konferensbidrag (refereegranskat)abstract
    • We consider the following clustering problems: given a general undirected graph, partition its vertices into disjoint clusters such that each cluster forms a clique and the number of edges within the clusters is maximized (Max-ECP), or the number of edges between clusters is minimized (Min-ECP). These problems arise naturally in the DNA clone classification. We investigate the hardness of finding such partitions and provide approximation algorithms. Further, we show that greedy strategies yield constant factor approxi mations for graph classes for which maximum cliques can be found efficiently.
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56.
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57.
  • Ellgardt, Anders, 1978-, et al. (författare)
  • Characteristics of a broad-band wide-scan fragmented aperture phased array antenna
  • 2006
  • Konferensbidrag (refereegranskat)abstract
    • In this paper a phased array antenna is described that is designed with the help of a genetic algorithm for scan angles out to 60° from broadside. The focus is on simplifying the manufacturing of the diagonally adjoining pixels and on numerical results for thin antennas. The effects of the corner to corner contacts are studied and results for two synthesized elements ar Test and measurement requirements on wireless devices
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60.
  • Ersson, Anders, et al. (författare)
  • A comparison between hexaaluminates and perovskites for catalytic combustion applications
  • 2006
  • Ingår i: Catalysis Today. - : Elsevier BV. - 0920-5861 .- 1873-4308. ; 112:04-jan, s. 157-160
  • Tidskriftsartikel (refereegranskat)abstract
    • Hexaaluminates and perovskites are two promising candidates for use in catalytic combustion applications. In the present study two hexaaluminates, LaMnAl11O19 and LaCoAl11O19, were compared with two perovskites, LaMnO3 and LaCoO3, with respect to their thermal stability and catalytic activity for combustion of methane and gasified biomass. The results showed that the hexaaluminates retained a much higher surface area even after calcination at 1200 degrees C compared to the perovskites. LaMnAl11O19 showed the highest catalytic activity of all catalysts. LaCoAl11O19 generally showed low activity. Of the two perovskites, LaCoO3 was the most active, and the initial test run the activity for biomass combustion were close to that one of LaMnAl11O19 even though its surface area was only one tenth of the hexaaluminate's. However, it was severely deactivated in the second test run. Similar deactivation but less severe was also found for the other catalyst.
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  • Resultat 51-60 av 240
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