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Träfflista för sökning "hsv:(NATURVETENSKAP) hsv:(Matematik) hsv:(Beräkningsmatematik) srt2:(2005-2009)"

Sökning: hsv:(NATURVETENSKAP) hsv:(Matematik) hsv:(Beräkningsmatematik) > (2005-2009)

  • Resultat 1-10 av 1141
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1.
  • Andersson, Fredrik K., et al. (författare)
  • The mathematics of internet search engines
  • 2008
  • Ingår i: Acta Applicandae Mathematicae - An International Survey Journal on Applying Mathematics and Mathematical Applications. - : Springer. - 0167-8019 .- 1572-9036. ; 104:2, s. 211-242
  • Tidskriftsartikel (refereegranskat)abstract
    • This article presents a survey of techniques for ranking results in search engines, with emphasis on link-based ranking methods and the PageRank algorithm. The problem of selecting, in relation to a user search query, the most relevant documents from an unstructured source such as the WWW is discussed in detail. The need for extending classical information retrieval techniques such as boolean searching and vector space models with link-based ranking methods is demonstrated. The PageRank algorithm is introduced, and its numerical and spectral properties are discussed. The article concludes with an alternative means of computing PageRank, along with some example applications of this new method.
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2.
  • Jagers, Peter, 1941 (författare)
  • Matematikens ord
  • 2009
  • Ingår i: LexicoNordica. ; 16, s. 315-318
  • Tidskriftsartikel (refereegranskat)
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6.
  • Otani, Hiroki, et al. (författare)
  • Morphometric study on the characteristic external features of normal and abnormal human embryos
  • 2008
  • Ingår i: Congenit Anom Kyoto. - : Wiley. ; 48:1, s. 18-28
  • Tidskriftsartikel (refereegranskat)abstract
    • The embryonic period is characterized by organogenesis and accompanying dynamic changes in external features. The measurement of human embryos has been limited to whole body dimensions, such as crown-rump length. More detailed measurements would add quantitative information about these characteristic events and provide a better understanding of normal and abnormal embryonic development. In the present study, we defined axes, landmarks, and measurements for human embryos, and measured 250 externally normal human embryos at Carnegie stages 14-23 (6.5-29.3 mm in crown-rump length, approximately 5-8 weeks of estimated ovulation age) that were fixed in Bouin's solution and preserved in 10% formalin solution. The axes, landmarks, and measurements defined for human embryos are corresponding to those in human and primate fetuses. The whole body, head, face, and extremities were measured using a scale attached to a dissecting microscope. Axial length, head height plus ear-shoulder length plus trunk height, was designated as a new measurement of the whole body, which is comparable with crown-rump length. Approximate standards of these measurements were obtained. The ratios of some measurements to trunk height and between the different parts were also obtained, and several different developmental patterns were recognized. The reproducibility of each measurement was evaluated by measuring 50 specimens three times each at intervals of one or two months. As a pilot study for the application of the proposed measurements, 84 human embryos with external anomalies, including holoprosencephaly, anomalies of extremities, and pharyngeal arch anomalies, were measured using the same method, and a few tendencies characteristic to holoprosencephaly were noticed.
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7.
  • Heintz, Alexey, 1955, et al. (författare)
  • A convolution thresholding scheme for the Willmore flow
  • 2008
  • Ingår i: Interfaces and Free Boundaries. - 1463-9971 .- 1463-9963. ; 10:2, s. 139-153
  • Tidskriftsartikel (refereegranskat)abstract
    • A convolution thresholding scheme fro geometric Willmore flows is suggested and the consistency is proved.
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8.
  • Petersson, Henrik, 1973 (författare)
  • Hypercyclicity in omega
  • 2007
  • Ingår i: PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY. - 0002-9939 .- 1088-6826. ; 135:4, s. 1145-1149
  • Tidskriftsartikel (refereegranskat)
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9.
  • Coquand, Thierry, 1961 (författare)
  • A logical approach to abstract algebra
  • 2005
  • Ingår i: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics). - Berlin, Heidelberg : Springer Berlin Heidelberg. - 1611-3349 .- 0302-9743. ; 3526, s. 86-95
  • Konferensbidrag (refereegranskat)abstract
    • Recent work in constructive mathematics show that Hilbert's program works for a large part of abstract algebra. Furthermore the arguments we get are not only elementary but also mathematically simpler. We present an example where the simplification was significant enough to suggest an improved version of a classical theorem. For this we use a general method to transform some logically complex first-order formulae in a geometrical form which may be interesting in itself.
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10.
  • Andrén, Daniel, 1973-, et al. (författare)
  • On the complexity of matrix reduction over finite fields
  • 2007
  • Ingår i: Advances in Applied Mathematics. - : Academic Press. - 0196-8858 .- 1090-2074. ; 39:4, s. 428-452
  • Tidskriftsartikel (refereegranskat)abstract
    • We study matrix elimination over finite fields, and present an algorithm which is asymptotically faster than the traditional Gauss--Jordan elimination. We also bound the average and worst-case complexity for the problem, proving that our algorithm is close to being optimal, and show related concentration results for random matrices.Next we present the results of a large computational study of the complexities for small matrices and fields. Here we determine the exact distribution of the complexity for matrices from $\mathrm{GL}_{n}(\mathbb{F}_{q})$, with $n$ an $q$ smallFinally we consider an extension of the problems studied for finite fields to finite semifields. We give a conjecture on the behaviour of a natural analogue of $\mathrm{GL}_{n}$ for semifields and prove this for a certain class of semifields.
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