Browsing Matematisk institutt by Title

Now showing items 7-26 of 3770

  • A (2,3)-complete intersection fourfold with no decomposition of the diagonal 
    Skauli, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We apply the specialization technique based on the decomposition of the diagonal to the intersection of a quadric and cubic hypersurface in P6. We find an explicit example defined over Q that is smooth, and does not admit ...
  • A (Dual) Network Model for Heat Transfer in Porous Media 
    Koch, Timo; Weishaupt, Kilian; Müller, Johannes; Weigand, Bernhard; Helmig, Rainer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract We present a dual network model to simulate coupled single-phase flow and energy transport in porous media including conditions under which local thermal equilibrium cannot be assumed. The models target applications ...
  • A Bayesian Approach to Smoothing and Forecasting Mortality RatesRestricted Access 
    Graff, Michael (Master thesis / Masteroppgave, 2014)
    The Icelandic population is scarce compared to the Norwegian, causing high variability in the observed mortalities. We apply two mortality models to data on the Norwegian population dating 60 years back, and the Icelandic ...
  • A Bayesian Binomial Regression Model with Latent Gaussian Processes for Modelling DNA Methylation 
    Hubin, Aliaksandr; Storvik, Geir Olve; Grini, Paul Eivind; Butenko, Melinka Alonso (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Epigenetic observations are represented by the total number of reads from a given pool of cells and the number of methylated reads, making it reasonable to model this data by a binomial distribution. There are numerous ...
  • A benchmarking exercise for environmental contours 
    Haselsteiner, Andreas F.; Coe, Ryan G.; Manuel, Lance; Chai, Wei; Leira, Bernt Johan; Clarindo, Guilherme; Soares, Carlos Guedes; Hannesdóttir, Ásta; Dimitrov, Nikolay; Sander, Aljoscha; Ohlendorf, Jan-Hendrik; Thoben, Klaus-Dieter; Hauteclocque, Guillaume de; Mackay, Ed; Jonathan, Philip; Qiao, Chi; Myers, Andrew; Rode, Anna; Hildebrandt, Arndt; Schmidt, Boso; Vanem, Erik; Huseby, Arne Bang (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Environmental contours are used to simplify the process of design response analysis. A wide variety of contour methods exist; however, there have been a very limited number of comparisons of these methods to date. This ...
  • A bit of tropical geometry 
    Shaw, Kristin; Brugallé, Erwan (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2014)
    This friendly introduction to tropical geometry is meant to be accessible to first year students in mathematics. The topics discussed here are basic tropical algebra, tropical plane curves, some tropical intersections, and ...
  • A boosting first-hitting-time model for survival analysis in high-dimensional settings 
    De Bin, Riccardo; Stikbakke, Vegard (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    In this paper we propose a boosting algorithm to extend the applicability of a first hitting time model to high-dimensional frameworks. Based on an underlying stochastic process, first hitting time models do not require ...
  • A characterization of supersmoothness of multivariate splines 
    Floater, Michael S. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We consider spline functions over simplicial meshes in Rn. We assume that the spline pieces join together with some finite order of smoothness but the pieces themselves are infinitely smooth. Such splines can have extra ...
  • A class of PSO-tuned controllers in Lorenz chaotic system 
    Dali, Ali; Abdelmalek, Samir; Bakdi, Azzeddine; Bettayeb, Maamar (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
    This paper considers the optimal robust control of chaotic systems subject to parameter perturbations and measurement noise. Three novel dynamic tracking controllers are designed herein to suppress the chaotic behaviour ...
  • A compact vocabulary of paratope-epitope interactions enables predictability of antibody-antigen binding 
    Akbar, Rahmad; Robert, Philippe Paul Auguste; Pavlović, Milena; Jeliazkov, Jeliazko R.; Snapkov, Igor; Slabodkin, Andrei; Weber, Cédric R.; Scheffer, Lonneke; Miho, Enkelejda; Haff, Ingrid Hobæk; Haug, Dag Trygve Truslew; Lund-Johansen, Fridtjof; Safonova, Yana; Sandve, Geir Kjetil Ferkingstad; Greiff, Victor (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Antibody-antigen binding relies on the specific interaction of amino acids at the paratope-epitope interface. The predictability of antibody-antigen binding is a prerequisite for de novo antibody and (neo-)epitope design. ...
  • A comparative study of methods for estimating model-agnostic Shapley value explanations 
    Olsen, Lars Henry Berge; Glad, Ingrid Kristine; Jullum, Martin; Aas, Kjersti (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
    Shapley values originated in cooperative game theory but are extensively used today as a model-agnostic explanation framework to explain predictions made by complex machine learning models in the industry and academia. ...
  • A continuous auction model with insiders and random time of information release 
    Corcuera, José Manuel; Di Nunno, Giulia; Farkas, Gergely; Øksendal, Bernt (Research report / Forskningsrapport, 2014)
  • A convergent finite volume method for the Kuramoto equation and related non-local conservation laws 
    Chatterjee, Neelabja; Fjordholm, Ulrik Skre (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    We derive and study a Lax–Friedrichs-type finite volume method for a large class of nonlocal continuity equations in multiple dimensions. We prove that the method converges weakly to the measure-valued solution and converges ...
  • A converse to the Schwarz lemma for planar harmonic maps 
    Brevig, Ole Fredrik; Ortega-Cerdà, Joaquim; Seip, Kristian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    A sharp version of a recent inequality of Kovalev and Yang on the ratio of the (H1)∗ and H4 norms for certain polynomials is obtained. The inequality is applied to establish a sharp and tractable sufficient condition for ...
  • A counterexample to the birational Torelli problem for Calabi-Yau 3-folds 
    Ottem, John Christian; Rennemo, Jørgen Vold (Journal article / Tidsskriftartikkel / SubmittedVersion, 2017)
    The Grassmannian Gr(2,5) is embedded in ℙ9 via the Pl\"ucker embedding. The intersection of two general PGL(10)-translates of Gr(2,5) is a Calabi-Yau 3-fold X, and the intersection of the projective duals of the two ...
  • A data-driven algorithm for online detection of component and system faults in modern wind turbines at different operating zones 
    Bakdi, Azzeddine; Kouadri, Abdelmalek; Mekhilef, Saad (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Advanced Fault Detection (FD) and isolation schemes are necessary to realize the required levels of reliability and availability and to minimize financial losses against failures. In particular, FD is essential in modern ...
  • A Data-Driven Snapshot Method for State of Health Modelling and Diagnostics of Maritime Battery Systems 
    Vanem, Erik; Bruch, Maximilian; Liang, Qin; Gonzalez, David Vicente Reyes; Alnes, Øystein Åsheim (Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2022)
    Battery systems are increasingly being used for powering ocean going ships, and the number of fully electric or hybrid ships relying on battery power for propulsion and manoeuvring is growing. In order to ensure the safety ...
  • A dataset of direct observations of sea ice drift and waves in ice 
    Rabault, Jean; Müller, Malte; Voermans, Joey; Brazhnikov, Dmitry; Turnbull, Ian; Marchenko, Aleksey; Biuw, Martin; Nose, Takehiko; Waseda, Takuji; Johansson, Malin; Breivik, Øyvind; Sutherland, Graig; Hole, Lars Robert; Johnson, Mark; Jensen, Atle; Gundersen, Olav; Kristoffersen, Yngve; Babanin, Alexander; Tedesco, Paulina Souza; Christensen, Kai Håkon; Kristiansen, Martin; Hope, Gaute; Kodaira, Tsubasa; Martins de Aguiar, Victor Cesar; Taelman, Catherine Cecilia A; Quigley, Cornelius Patrick; Filchuk, Kirill; Mahoney, Andrew R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Variability in sea ice conditions, combined with strong couplings to the atmosphere and the ocean, lead to a broad range of complex sea ice dynamics. More in-situ measurements are needed to better identify the phenomena ...
  • A decision support system for safer airplane landings: Predicting runway conditions using XGBoost and explainable AI 
    Midtfjord, Alise Danielle; De Bin, Riccardo; Huseby, Arne Bang (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The presence of snow and ice on runway surfaces reduces the available tire-pavement friction needed for retardation and directional control and causes potential economic and safety threats for the aviation industry during ...
  • A difference method for the McKean–Vlasov equation 
    Coclite, Giuseppe Maria; Risebro, Nils Henrik (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    We analyze a model equation arising in option pricing. This model equation takes the form of a nonlinear, nonlocal diffusion equation. We prove the well posedness of the Cauchy problem for this equation. Furthermore, we ...