Now showing items 211-230 of 289

    • Quality of the Analysis Step in EnKF 

      Bergo, Brede Rem (The University of Bergen, 2011-06-15)
      In many physical applications we want to characterize the parameters of a system based on indirect observations or measurements. In a reservoir simulator setting, the goal is to simulate the production of hydrocarbons ...
      Master thesis
    • Radielle basisfunksjoner som adaptiv kollokasjonsmetode 

      Nicolajsen, Tomas (The University of Bergen, 2014-06-01)
      Hensikten med oppgaven er å undersøke en adaptiv kollokasjonsmetode basert på radielle basisfunksjoner. Målet er å finne ut om man med enkle kriterier for senter- og formparameterfordelingen kan oppnå en fordeling ...
      Master thesis
    • Reactive Transport in Porous Media 

      Sævik, Pål Næverlid (The University of Bergen, 2011-08-01)
      In this thesis, we show how the common equations for flow in porous media can be expanded to account for geochemical reactions. Furthermore, the complications arising when solving the new equations numerically are described ...
      Master thesis
    • Reconstructing Open Surfaces via Graph-Cuts 

      Wan, Min; Wang, Yu; Bae, Egil; Tai, Xue-Cheng; Wang, Desheng (The authors, 2011)
      A novel graph-cuts-basedmethod is proposed for reconstructing open surfaces from unordered point sets. Through a boolean operation on the crust around the data set, the open surface problem is translated to a watertight ...
    • Regresjonsmodeller i skipsforsikring 

      Schei, Ole Johan Sørensen (The University of Bergen, 2009-09-15)
      Master thesis
    • Rekneark på ungdomstrinnet 

      Johansson, Kari (The University of Bergen, 2014-06-06)
      Problemstillinga i oppgåva var korleis opplever elevane bruk av rekneark i matematikk på ungdomstrinnet. Gjennom eitt år vart ulike reknearkoppgåver prøvd ut i 9./10. klasse. I etterkant henta eg inn data ved hjelp av ...
      Master thesis
    • Relaxation Schemes for degenerate parabolic convection-diffusion equations with a discontinuous coeffiicient 

      Rabenorolahy, Lalaniaina David (The University of Bergen, 2008)
      Master thesis
    • Renal Function Estimation using Magnetic Resonance Images 

      Schwinger, Eyram A. Kojo (The University of Bergen, 2009-06-02)
      This study is aimed at testing the use of Magnetic Resonance (MR) images and mathematical models for renal parameter estimation. The study was based on four models; the Patlak model, Cortical Compartment model, Separable ...
      Master thesis
    • Reversible Jump Markov Chain Monte Carlo: Some Theory and Applications 

      Lyyjynen, Hannu Sakari (The University of Bergen, 2014-03-10)
      The history of MCMC, theories of Bayesian thinking and model choice, the Accept- Reject-algorithm, Markov chains, the Metropolis- Hastings-algorithm and the reversible jump MCMC are explained. Then the reversible ...
      Master thesis
    • Risk of Leakage versus Depth of Injection in Geological Storage 

      Celia, Michael A.; Nordbotten, Jan Martin; Bachu, Stefan; Dobossy, Mark E.; Court, Benjamin (Elsevier, 2009-02)
      One of the outstanding challenges for large-scale CCS operations is to develop reliable quantitative risk assessments with a focus on leakage of both injected CO2 and displaced brine. A critical leakage pathway is associated ...
      Journal article
    • Robust Control Volume Methods for Reservoir Simulation on Challenging Grids 

      Keilegavlen, Eirik (The University of Bergen, 2010-02-19)
      Doctoral thesis
    • A robust implicit scheme for two-phase flow in porous media 

      Kvashchuk, Anna (The University of Bergen, 2015-11-26)
      In this thesis we present a new implicit scheme for the numerical simulation of two-phase flow in porous media. Linear finite elements are considered for the spatial discretization. The scheme is based on the ...
      Master thesis
    • A robust linearization scheme for finite volume based discretizations for simulation of two-phase flow in porous media 

      Radu, Adrian Florin; Nordbotten, Jan Martin; Pop, Iuliu Sorin; Kumar, Kundan (Elsevier, 2015-12)
      In this work we consider a mathematical model for two-phase flow in porous media. The fluids are assumed immiscible and incompressible and the solid matrix non-deformable. The mathematical model for the two-phase flow is ...
      Journal article
    • Robust Multiscale Control-volume Methods for Reservoir Simulation 

      Sandvin, Andreas (The University of Bergen, 2012-04-30)
      Doctoral thesis
    • Robusthet ved skadereservering - Chain-Ladder og influens funksjoner 

      Ones, Sindre (The University of Bergen, 2011-06-01)
      I denne oppgaven har jeg sett på hvordan uteliggere kan påvirke IBNR reserven i skadereservering. Jeg har studert influens funksjoner for den klassiske Chain-Ladder metoden, og videre sett at uteliggere kan påvirke ...
      Master thesis
    • Ruin probability and optimal dividend policy for models with investment 

      Hunting, Martin (The University of Bergen, 2012-11-06)
      In most countries the authorities impose capital requirements on insurance companies in order to avoid the adverse consequences to society when insurance companies default on claims. Since holding capital is costly, this ...
      Doctoral thesis
    • Sammenhenger mellom koder, matroider, grafer og simplisielle komplekser 

      Heiseldal, Bård (The University of Bergen, 2008)
      Denne masteroppgaven handler hovedsakelig om å studere sammenhenger mellom ulike em- ner innen algebra og kombinatorikk. De matematiske konseptene som studeres, er lineære koder, matroider, grafer og simplisielle komplekser, ...
      Master thesis
    • Sampling error distribution for the ensemble Kalman filter update step 

      Kovalenko, Andrey; Mannseth, Trond; Nævdal, Geir (Springer, 2011-07-06)
      In recent years, data assimilation techniques have been applied to an increasingly wider specter of problems. Monte Carlo variants of the Kalman filter, in particular, the ensemble Kalman filter (EnKF), have gained ...
      Peer reviewedJournal article
    • Scene Reconstruction Using Level Sets and Graph Cuts 

      Knudsen, Ørjan (The University of Bergen, 2009-07-17)
      Master thesis
    • Scroll codes over curves of higher genus 

      Johnsen, Trygve; Rasmussen, Nils Henry (Springer, 2010)
      We construct linear codes from scrolls over curves of high genus and study the higher support weights di of these codes. We embed the scroll into projective space Pk-1 and calculate bounds for the di by considering the ...
      Journal articlePeer reviewed