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  • COPD in primary lung cancer patients: prevalence and mortality 

    Ytterstad, Elinor; Moe, Per Christian; Hjalmarsen, Audhild (Journal article; Peer reviewed, 2016-03-23)
    Background: Previous studies have relied on international spirometry criteria to diagnose COPD in patients with lung cancer without considering the effect lung cancer might have on spirometric results. The aim of this study ...
  • A generalization of weight polynomials to matroids 

    Johnsen, Trygve; Roksvold, Jan Nyquist; Verdure, Hugues (Tidsskriftartikkel; Peer reviewed, 2015-11-11)
    Generalizing polynomials previously studied in the context of linear codes, we define weight polynomials and an enumerator for a matroid M. Our main result is that these polynomials are determined by Betti numbers associated ...
  • A generalization of Kung’s theorem 

    Johnsen, Trygve; Shiromoto, Keisuke; Verdure, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-01)
    We give a generalization of Kung’s theorem on critical exponents of linear codes over a finite field, in terms of sums of extended weight polynomials of linear codes. For all i=k+1,…,ni=k+1,…,n, we give an upper bound on ...
  • Stanley-Reisner resolution of constant weight linear codes 

    Johnsen, Trygve; Verdure, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-08)
    Given a constant weight linear code, we investigate its weight hierarchy and the Stanley–Reisner resolution of its associated matroid regarded as a simplicial complex. We also exhibit conditions on the higher weights ...
  • Betti numbers associated to the facet ideal of a matroid 

    Johnsen, Trygve; Roksvold, Jan Nyquist; Verdure, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-01-06)
    To a matroid M with n edges, we associate the so-called facet ideal F(M)⊂k[x1,…,xn] , generated by monomials corresponding to bases of M. We show that when M is a graph, the Betti numbers related to an ℕ0-graded minimal ...
  • Stem cell regulation: Implications when differentiated cells regulate symmetric stem cell division 

    Høyem, Marte Rørvik; Måløy, Frode; Jakobsen, Per; Brandsdal, Bjørn Olav (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-05-19)
    We use a mathematical model to show that if symmetric stem cell division is regulated by differentiated cells, then changes in the population dynamics of the differentiated cells can lead to changes in the population ...
  • Dørene lukkes for klimamålene 

    Rypdal, Kristoffer (Journal article; Tidsskriftartikkel, 2016)
    FNs klimapanel har utarbeidet en rekke prognoser for økningen i global middeltemperatur basert på ulike scenarier for ­ut­vik­lingen av utslipp av drivhusgasser og partikler fra menneskelig aktivitet. Disse prognosene er ...
  • Holdbarhet på klippfisk. Vekst av rødmidd i klippfisk lagret ved forhøyede temperaturer (AP2) 

    Lorentzen, Grete Elisabeth; Johansen, Jørn-Owe; Breiland, Mette Serine Wesmajervi; Dahl, Reidun Wenche; Sandaker, Elin Kristianne; Ytterstad, Elinor (Research report; Forskningsrapport, 2016-02)
    I prosjektet «Holdbarhet på klippfisk» er det foretatt studier for å fastsette holdbarhet på klippfisk basert på vekst av rødmidd. Denne rapporten referer til studier hvor klippfisk er lagret ved forhøyede temperaturer. ...
  • Limits to the quantification of local climate change 

    Chapman, Sandra; Stainforth, David A.; Watkins, Nicholas W. (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09-16)
    Abstract Wedemonstrate how the fundamental timescales of anthropogenic climate change limit the identification of societally relevant aspects of changes in precipitation.Weshow that it is nevertheless possible to extract, ...
  • Computer-aided decision support for melanoma detection applied on melanocytic and non-melanocytic skin lesions: a comparison of two systems based on automatic analysis of dermoscopic images 

    Møllersen, Kajsa; Kirchesch, Herbert M.; Zortea, Maciel; Schopf, Thomas Roger Griesbeck; Hindberg, Kristian; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2015)
    Commercially available clinical decision support systems (CDSSs) for skin cancer have been designed for the detection of melanoma only. Correct use of the systems requires expert knowledge, hampering their utility for ...
  • Attribution in the presence of a long-memory climate response 

    Rypdal, Kristoffer (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-18)
    Multiple, linear regression is employed to attribute variability in the global surface temperature to various forcing components and prominent internal climatic modes. The purpose of the study is to assess how sensitive ...
  • Network analysis of geomagnetic substorms using the SuperMAG database of ground-based magnetometer stations 

    Dods, Joe; Chapman, Sandra; Gjerløv, Jesper (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09-26)
    The overall morphology and dynamics of magnetospheric substorms is well established in terms of the observed qualitative auroral features seen in ground-based magnetometers. This paper focuses on the quantitative ...
  • Klimakrisen og økonomisk politikk 

    Rypdal, Kristoffer (Chronicle; Kronikk, 2015-11-14)
  • Long-memory effects in linear response models of Earth's temperature and implications for future global warming 

    Rypdal, Martin Wibe; Rypdal, Kristoffer (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-07-15)
    A linearized energy-balance model for global temperature is formulated, featuring a scale-invariant longrange memory (LRM) response and stochastic forcing representing the influence on the ocean heat reservoir from ...
  • Dørene lukkes for klimamålene 

    Rypdal, Kristoffer (Chronicle; Kronikk, 2015-11-10)
  • Global warming projections derived from an observation-based minimal model 

    Rypdal, Kristoffer (Journal article; Tidsskriftartikkel, 2015-09-18)
    A simple conceptual model for the global mean surface temperature (GMST) response to CO2 emissions is presented and analysed. It consists of linear long-memory models for the GMST anomaly response ∆T to radiative forcing ...
  • Attribution in the presence of a long-memory climate response 

    Rypdal, Kristoffer (Journal article; Tidsskriftartikkel, 2015-08-10)
    Multiple, linear regression is employed to attribute variability in the global surface temperature to various forcing components and prominent internal climatic modes. The purpose of the study is to asses how sensitive ...
  • Are there multiple scaling regimes in Holocene temperature records? 

    Nilsen, Tine; Rypdal, Kristoffer; Fredriksen, Hege-Beate (Journal article; Tidsskriftartikkel, 2015-07-17)
    The concept of multiple scaling regimes in temperature time series is examined, with emphasis on the question whether or not a mono-scaling model can be rejected from the data at hand. A model with only one regime is ...
  • Spatiotemporal Long-Range Persistence in Earth’s Temperature Field: Analysis of Stochastic-Diffusive Energy Balance Models 

    Rypdal, Kristoffer; Rypdal, Martin Wibe; Fredriksen, Hege-Beate (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-01)
    A two-dimensional stochastic–diffusive energy balance model (EBM) formulated on a sphere by G. R. North et al. is explored and generalized. Instantaneous and frequency-dependent spatial autocorrelation functions and local ...
  • Late quaternary temperature variability described as abrupt transitions on a 1/f noise background 

    Rypdal, Martin Wibe; Rypdal, Kristoffer (Journal article; Tidsskriftartikkel, 2015-11-09)
    We show that in order to have a scaling description of the climate system that is not inherently non-stationary, the rapid shifts between stadial and interstadial conditions during the last glaciation cannot be included ...

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