Blar i Institutt for matematiske fag på tittel

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    • The role of gentle algebras in higher homological algebra 

      Haugland, Johanne; Jacobsen, Karin M.; Schroll, Sibylle (Peer reviewed; Journal article, 2022)
      We investigate the role of gentle algebras in higher homological algebra. In the first part of the paper, we show that if the module category of a gentle algebra Λ contains a d-cluster tilting subcategory for some d≥2 , ...

    • Romlig interpolering av nedbør 

      Andresen, Arne (Master thesis, 2006)
      I denne oppgaven brukes enkel kriging til å interpolere nedbørsmålinger med tidsoppløsning ett døgn hentet fra 28 nedbørsstasjoner som befinner seg på og omkring Hardangervidda. Historiske tidsserier fra nedbørsstasjonene ...

    • Root Systems, Cluster Algebras and Triangulations of a Regular n-gon 

      Alne, Katrine (Master thesis, 2010)
      This thesis introduces the concepts of root systems, quivers, Dynkin diagrams, triangulation of polygons and cluster algebra. The main goal is to find a connection between all these topics.

    • Rotating shaft's non-linear response statistics under biaxial random excitation, by path integration 

      Gaidai, Oleg; Dimentberg, Michael; Næss, Arvid (Journal article; Peer reviewed, 2018)
      The response of rotating shaft to random excitations is of practical concern for various rotor type engine design applications, with high level of potential external forces of stochastic nature. Authors have studied ...

    • Rotations in Factor Analysis 

      Singdahlsen, Martinius Theodor (Bachelor thesis, 2022)
      Denne oppgaven vil omhandle faktoranalyse med hovedfokus på faktormodellens rotasjoner. Rotasjoner brukes både for å kunne trekke slutninger og for å bedre tolke dataene. I denne sammenheng vil vi se på kriteriene som er ...

    • The S p k , n –local stable homotopy category 

      Heard, Drew Kenneth (Peer reviewed; Journal article, 2023)

    • Saddlepoint approximated methods for computing p-values in score tests 

      Aasen, Nora Røhnebæk (Master thesis, 2023)
      I denne oppgaven presenteres, både teoretisk og ved hjelp av eksempler, to alternative metoder for å regne p-verdier i en score test i motsetning til å anta en normalfordeling på score-statistikken. Vi presenterer en dobbel ...

    • Saddlepoint approximations to score test statistics in logistic regression for analyzing genome-wide association studies 

      Johnsen, Pål Vegard; Bakke, Øyvind; Bjørnland, Thea; DeWan, Andrew Thomas; Langaas, Mette (Peer reviewed; Journal article, 2023)
      We investigate saddlepoint approximations of tail probabilities of the score test statistic in logistic regression for genome-wide association studies. The inaccuracy in the normal approximation of the score test statistic ...

    • Sammenhenger mellom elevers forestillinger om forståelse i matematikk og undervisningen de erfarer 

      Monsen, Renate; Sandmark, Linda Ytterdahl (Master thesis, 2010)
      I masteroppgaven fokuseres det på elevers forestillinger om forståelse, og på matematikkundervisning. Målet med studien er å få dypere innsikt i sammenhenger mellom elevers forestillinger om forståelse i matematikk, og ...

    • Sammenhenger mellom elevers motivasjon for matematikk og den undervisningen de erfarer 

      Kvikne, Hild Mari (Master thesis, 2011)
      Studien har til hensikt å undersøke elevers motivasjon for matematikk. Mer spesifikt hvilke sammenhenger det kan være mellom elevenes målorientering i matematikk og den undervisningspraksisen de erfarer i faget. Studiens ...

    • Sammenligning og prediksjon av gassmålinger. 

      Sandvik, Eivind Bjøralt (Master thesis, 2009)
      Denne oppgaven utarbeider en metode for å estimere ankomsttider til gass basert på en sammenligning av tidsrekker. Disse tidsrekkene består av målinger av ulike egenskaper til gassen ved innløp og utløp av et rør. Volumflyt ...

    • Sampling and periodization of generators of Heisenberg modules 

      Jakobsen, Mads Sielemann; Luef, Franz (Journal article; Peer reviewed, 2019)
      This paper considers generators of Heisenberg modules in the case of twisted group C∗-algebras of closed subgroups of locally compact abelian (LCA) groups and how the restriction and/or periodization of these generators ...

    • Sampling decisions for energy efficient IoT sensors using conditional copula models 

      Martine Lysebo (Master thesis, 2021)
      For å gjøre IoT-sensorer mer energieffektive, undersøkes bruk av avhengighetsstrukturer for å redusere samplingsfrekvensen. I denne oppgaven hvor vi ser på støynivåer i arbeidsmiljøet Koopen, er en observasjon hvert 15. ...

    • Sampling design methods for making improved lake management decisions 

      Koski, Vilja; Eidsvik, Jo (Journal article; Peer reviewed, 2024)
      The ecological status of lakes is important for understanding an ecosystem's biodiversity as well as for service water quality and policies related to land use and agricultural run-off. If the status is weak, then decisions ...

    • Sampling of entire functions of several complex variables on a lattice and multivariate Gabor frames 

      Gröchenig, Karlheinz; Lyubarskii, Yurii (Peer reviewed; Journal article, 2019)
      We give a general construction of entire functions in d complex variables that vanish on a lattice of the form = A(Z + iZ)d for an invertible complex-valued matrix. As an application, we exhibit a class of lattices of ...

    • Sampling on Quasicrystals 

      Grepstad, Sigrid (Master thesis, 2011)
      We prove that quasicrystals are universal sets of stable sampling in any dimension. Necessary and sufficient density conditions for stable sampling and interpolation sets in one dimension are studied in detail.

    • SARS-CoV-2 aerosol transmission in schools: The effectiveness of different interventions 

      Villers, Jennifer; Henriques, Andre; Calarco, Serafina; Rognlien, Markus Kongstein; Mounet, Nicolas; Devine, James; Azzopardi, Gabriella; Elson, Philip; Andreini, Marco; Tarocco, Nicola; Vassella, Claudia; Keiser, Olivia (Peer reviewed; Journal article, 2022)
      BACKGROUND: Indoor aerosol transmission of SARS-CoV-2 has been widely recognised, especially in schools where children remain in closed indoor spaces and largely unvaccinated. Measures such as strategic natural ventilation ...

    • A scalarization scheme for binary relations with applications to set-valued and robust optimization 

      Gutiérrez, César; Huerga, Lidia; Köbis, Elisabeth Anna Sophia; Tammer, Christiane (Peer reviewed; Journal article, 2020)
      In this paper, a method for scalarizing optimization problems whose final space is endowed with a binary relation is stated without assuming any additional hypothesis on the data of the problem. By this approach, nondominated ...

    • Scattering and Uncertainty for discrete models 

      Alvarez-Romero, Isaac (Doctoral theses at NTNU;2017:37, Doctoral thesis, 2017)

    • Scenario tree generation for stochastic programming : cases from finance 

      Kaut, Michal (Dr. ingeniøravhandling, 0809-103X; 2003:55, Doctoral thesis, 2003)
      In recent years, stochastic programming has gained an increasing popularity within the mathematical programming community, mainly because the present computing power allows users to add stochasticity to models that were ...