• English
    • Norsk
  • English 
    • English
    • Norsk
  • Administration
Search 
  •   Home
  • Det matematisk-naturvitenskapelige fakultet
  • Matematisk institutt
  • Matematisk institutt
  • Search
  •   Home
  • Det matematisk-naturvitenskapelige fakultet
  • Matematisk institutt
  • Matematisk institutt
  • Search
JavaScript is disabled for your browser. Some features of this site may not work without it.

Search

Show Advanced FiltersHide Advanced Filters

Filters

Use filters to refine the search results.

Now showing items 201-300 of 2702

  • Sort Options:
  • Relevance
  • Title Asc
  • Title Desc
  • Issue Date Asc
  • Issue Date Desc
  • Results Per Page:
  • 5
  • 10
  • 20
  • 40
  • 60
  • 80
  • 100
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 ...
Convex environmental contours 
Huseby, Arne; Vanem, Erik; Agrell, Christian; Hafver, Andreas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Environmental contours are widely used as a basis for e.g., ship design, especially in early design phases. The traditional approach to such contours is based on the well-known Rosenblatt transformation. Here we focus on ...
Continuous and discrete-time survival prediction with neural networks 
Kvamme, Håvard; Borgan, Ørnulf (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Abstract Due to rapid developments in machine learning, and in particular neural networks, a number of new methods for time-to-event predictions have been developed in the last few years. As neural networks are parametric ...
Modification of Airflow Structure Due to Wave Breaking on a Submerged Topography 
Vollestad, Petter; Jensen, Atle (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Abstract Experimental results from a combined wind–wave tank are presented. Wind profiles and resulting wind–wave spectra are described, and an investigation of the airflow above breaking waves is presented. Monochromatic ...
Non-stationary extreme value analysis of sea states based on linear trends. Analysis of annual maxima series of significant wave height and peak period in the Mediterannean Sea 
De Leo, Francesco; Besio, Giovanni; Briganti, Riccardo; Vanem, Erik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Non-stationary Extreme Value Analysis (NEVA) allows to determine the probability of exceedance of extreme sea states taking into account trends in the time series of data at hand. In this work, we analyse the reliability ...
Framework for evaluating statistical models in physics education research 
Aiken, John Mark; De Bin, Riccardo; Lewandowski, Heather; Caballero, Marcos Daniel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Across the field of education research there has been an increased focus on the development, critique, and evaluation of statistical methods and data usage due to recently created, very large datasets and machine learning ...
Deep learning through LSTM classification and regression for transmission line fault detection, diagnosis and location in large-scale multi-machine power systems 
Belagoune, Soufiane; Bali, Noureddine; Bakdi, Azzeddine; Baadji, Bousaadia; Atif, Karim (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
Fault detection, diagnosis, identification and location are crucial to improve the sensitivity and reliability of system protection. This maintains power systems continuous proper operation; however, it is challenging in ...
An investigation into the turbulence induced by moving ice floes 
Løken, Trygve Kvåle; Marchenko, Aleksey; Ellevold, Thea Josefine; Rabault, Jean; Jensen, Atle (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Renormalization of stochastic continuity equations on Riemannian manifolds 
Galimberti, Luca; Karlsen, Kenneth H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Log-modulated rough stochastic volatility models 
Bayer, Christian; Harang, Fabian Andsem; Pigato, Paolo (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
We propose a new class of rough stochastic volatility models obtained by modulating the power-law kernel defining the fractional Brownian motion (fBm) by a logarithmic term, such that the kernel retains square integrability ...
Robust preconditioners for perturbed saddle-point problems and conservative discretizations of Biot's equations utilizing total pressure 
Boon, Wietse; Kuchta, Miroslav; Mardal, Kent-Andre; Ruiz-Baier, Ricardo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We develop robust solvers for a class of perturbed saddle-point problems arising in the study of a second-order elliptic equation in mixed form (in terms of flux and potential), and of the four-field formulation of Biot's ...
Alternating Sign and Sign-Restricted Matrices: Representations and Partial Orders 
Brualdi, R.A.; Dahl, Geir (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Sign-restricted matrices (SRMs) are (0,±1)-matrices where, ignoring 0's, the signs in each column alternate beginning with a +1 and all partial row sums are nonnegative. The most investigated of these matrices are the ...
Flexible Bayesian Nonlinear Model Configuration 
Hubin, Aliaksandr; Storvik, Geir; Frommlet, Florian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Regression models are used in a wide range of applications providing a powerful scientific tool for researchers from different fields. Linear, or simple parametric, models are often not sufficient to describe complex ...
Sign-restricted matrices of 0's, 1's, and −1's 
Brualdi, Richard A.; Dahl, Geir (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We study sign-restricted matrices (SRMs), a class of rectangular (0, ±1)-matrices generalizing the alternating sign matrices (ASMs). In an SRM each partial column sum, starting from row 1, equals 0 or 1, and each partial ...
Convex (0,1)-Matrices and Their Epitopes, 
Brualdi, R.A.; Dahl, Geir (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Diagonal Sums of Doubly Stochastic Matrices 
Brualdi, R.A.; Dahl, Geir (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
A1-homotopy Theory and Contractible Varieties: A Survey 
Asok, Aravind; Østvær, Paul Arne (Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2021)
We survey some topics in A1-homotopy theory. Our main goal is to highlight the interplay between A1-homotopy theory and affine algebraic geometry, focusing on the varieties that are “contractible” from various standpoints.
Iceberg stability during towing in a wave field 
Løken, Trygve Kvåle; Marchenko, Aleksey; Rabault, Jean; Gundersen, Olav; Jensen, Atle (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Particle Representation for the Solution of the Filtering Problem. Application to the Error Expansion of Filtering Discretizations 
Crisan, Dan; Kurtz, Thomas G.; Ortiz-Latorre, Salvador (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We introduce a weighted particle representation for the solution of the filtering problem based on a suitably chosen variation of the classical de Finetti theorem. This representation has important theoretical and numerical ...
Skew products of finitely aligned left cancellative small categories and Cuntz–Krieger algebras 
Bedos, Erik Christopher; Kaliszewski, S.; Quigg, John (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
Given a group cocycle on a finitely aligned left cancellative small category (LCSC), we investigate the associated skew product category and its Cuntz–Krieger al- gebra, which we describe as the crossed product of the ...
Inverting catalecticants of ternary quartics 
Moncusí, L. Brustenga I; Cazzador, Elisa; Homs, R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We study the reciprocal variety to the LSSM of catalecticant matrices associated with ternary quartics. With numerical tools, we obtain 85 to be its degree and 36 to be the ML-degree of the LSSM. We provide a geometric ...
C ∞ - regularization of ODEs perturbed by noise 
Harang, Fabian Andsem; Perkowski, Nicolas (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
We study ordinary differential equations (ODEs) with vector fields given by general Schwartz distributions, and we show that if we perturb such an equation by adding an “infinitely regularizing” path, then it has a unique ...
Homology and K-theory of dynamical systems I. Torsion-free ample groupoids 
Proietti, Valerio; Yamashita, Makoto (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
Given an ample groupoid, we construct a spectral sequence with groupoid homology with integer coefficients on the second sheet, converging to the K-groups of the (reduced) groupoid C∗-algebra, provided the groupoid has ...
Uniform recovery in infinite-dimensional compressed sensing and applications to structured binary sampling 
Adcock, Ben; Antun, Vegard; Hansen, Anders Christian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Infinite-dimensional compressed sensing deals with the recovery of analog signals (functions) from linear measurements, often in the form of integral transforms such as the Fourier transform. This framework is well-suited ...
Educating to inspire active learning approaches in mathematics in Norwegian universities 
Goodchild, Simon; Bjørkestøl, Kirsten; Borge, Inger Christin; Nilsen, Hans Kristian; Tonheim, Odd Helge Mjellem (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
This is a report of an analysis of some of the data generated by a national survey of teaching approaches used in higher education mathematics courses. The overall purpose of the survey was to explore how widespread is the ...
Chow groups and pseudoffective cones of complexity-one T-varieties 
Nødland, Bernt Ivar Utstøl (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Abstract We show that the pseudoeffective cone of k -cycles on a complete complexity-one T -variety is rational polyhedral for any k , generated by classes of T -invariant subvarieties. When X is also rational, we give a ...
A refinement of the motivic volume, and specialization of birational types 
Nicaise, Johannes; Ottem, John Christian (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
We construct an upgrade of the motivic volume by keeping track of dimensions in the Grothendieck ring of varieties. This produces a uniform refinement of the motivic volume and its birational version introduced by Kontsevich ...
Divalent ligand-monovalent molecule binding 
Janssen, Mathijs Adriaan; Stenmark, Harald; Carlson, Andreas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Simultaneous binding of a divalent ligand to two identical monovalent molecules is a widespread phenomenon in biology and chemistry. Here, we describe how two such monovalent molecules B bind to a divalent ligand AA to ...
On environmental contours for marine and coastal design 
Ross, Emma; Astrup, Ole Christian; Bitner-Gregersen, Elzbieta; Bunn, Nigel; Feld, Graham; Gouldby, Ben; Huseby, Arne; Liu, Ye; Randell, David; Vanem, Erik; Jonathan, Philip (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Environmental contours are used in structural reliability analysis of marine and coastal structures as an approximate means to locate the boundary of the distribution of environmental variables, and hence sets of environmental ...
Intracranial pressure elevation alters CSF clearance pathways 
Vinje, Vegard; Eklund, Anders; Mardal, Kent-Andre; Rognes, Marie E; Støverud, Karen-Helene (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Background Infusion testing is a common procedure to determine whether shunting will be beneficial in patients with normal pressure hydrocephalus. The method has a well-developed theoretical foundation and ...
Data-driven methods for multiple sensor streams, with applications in the maritime industry 
Brandsæter, Andreas (Doctoral thesis / Doktoravhandling, 2020)
Stochastic Modeling with Fractional and non-Fractional Noises: Applications to Finance and Insurance 
Lagunas Merino, Marc (Doctoral thesis / Doktoravhandling, 2020)
In my doctoral work, I have developed stochastic models that use different type of noises, to price financial derivatives and insurance products. Stock prices have a random component in their behavior that characterizes ...
Diffusion on membrane domes, tubes and pearling structures 
Rojas Molina, Rossana Virginia; Liese, Susanne; Carlson, Andreas (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Diffusion is a fundamental mechanism for protein distribution in cell membranes. These membranes often exhibit complex shapes, which range from shallow domes to elongated tubular or pearl-like structures. Shape complexity ...
Investigations into real determinantal quartic hypersurfaces 
Helsø, Martin (Doctoral thesis / Doktoravhandling, 2020)
This thesis is a collection of four papers about symmetric and Hermitian determinantal representations of quartic hypersurfaces. - Paper I classifies rational quartic symmetroids in 3-space. - Paper II classifies rational ...
Epidemiological, econometric, and decision theoretic applications of statistical inference 
Stoltenberg, Emil Aas (Doctoral thesis / Doktoravhandling, 2020)
This thesis presents new statistical methodology, models, and estimators that are geared towards answering scientific questions in epidemiology and medicine, and in economics and finance. The questions are: (i) What is the ...
Apparent diffusion coefficient estimates based on 24 hours tracer movement support glymphatic transport in human cerebral cortex 
Valnes, Lars Magnus; Mitusch, Sebastian; Ringstad, Geir; Eide, Per Kristian; Funke, Simon Wolfgang; Mardal, Kent-Andre (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The recently proposed glymphatic system suggests that bulk flow is important for clearing waste from the brain, and as such may underlie the development of e.g. Alzheimer’s disease. The glymphatic hypothesis is still ...
Assessing graph-based read mappers against a baseline approach highlights strengths and weaknesses of current methods 
Grytten, Ivar; Rand, Knut D; Nederbragt, Alexander J; Sandve, Geir K (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Background Graph-based reference genomes have become popular as they allow read mapping and follow-up analyses in settings where the exact haplotypes underlying a high-throughput sequencing experiment are ...
Heisenberg modules as function spaces 
Enstad, Ulrik Bo Rufus; Austad, Are (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
A pencil of Enriques surfaces with non-algebraic integral Hodge classes 
Ottem, John Christian; Suzuki, Fumiaki (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We prove that there exists a pencil of Enriques surfaces defined over Q with non-algebraic integral Hodge classes of non-torsion type. This gives the first example of a threefold with the trivial Chow group of zero-cycles ...
New and extended design moment formulations for slender columns in frames with sway 
Hellesland, Jostein (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Present first-order based design code formulations for slender columns in frames with sway, employ sway magnification factors (for global second-order effects) also as moment magnifiers for the individual columns of the ...
Discontinuous Galerkin methods for multiphase flow 
Landet, Tormod Ravnanger (Doctoral thesis / Doktoravhandling, 2020)
This thesis describes a finite element method for simulation of free-surface flows, such as ocean waves, using the discontinuous Galerkin method. Free-surface flows where there is a large difference in density between two ...
Rational quartic symmetroids 
Helsø, Martin (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We classify rational, irreducible quartic symmetroids in projective 3-space. They are either singular along a line or a smooth conic section, or they have a triple point or a tacnode.
When will a sequence of points in a Riemannian submanifold converge? 
Truong, Tuyen Trung (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Let X be a Riemannian manifold and xn a sequence of points in X. Assume that we know a priori some properties of the set A of cluster points of xn. The question is under what conditions that xn will converge. An answer to ...
Time-to-Event Prediction with Neural Networks 
Kvamme, Håvard (Doctoral thesis / Doktoravhandling, 2020)
In the last decades the analytical value of data has really become apparent and the amount of data collected has vastly increased. This enables us to approach problems in more data driven manners. In the thesis, I have ...
Extreme wave statistics of long-crested irregular waves over a shoal 
Trulsen, Karsten; Raustøl, Anne; Jorde, Stian; Rye, Lisa Bæverfjord (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We report laboratory experiments of long-crested irregular water surface waves propagating over a shoal. For a sufficiently shallow shoal we find that the surface elevation can have a local maximum of skewness and kurtosis ...
Alternating Sign Matrices -- Extensions, Konig-properties, and Primary Sum-Sequences 
Brualdi, R.A.; Dahl, Geir (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
This paper is concerned with properties of permutation matrices and alternating sign matrices (ASMs). An ASM is a square (0,±1)-matrix such that, ignoring 0’s, the 1’s and −1’s in each row and column alternate, beginning ...
Online Monitoring Scheme Using PCA through Kullback-Leibler Divergence Analysis Technique for Fault Detection 
Bounoua, Wahiba; Benkara, Amina B.; Kouadri, Abdelmalek; Bakdi, Azzeddine (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Principal component analysis (PCA) is a common tool in the literature and widely used for process monitoring and fault detection. Traditional PCA is associated with the two well-known control charts, the Hotelling’s T2 and ...
CSM cycles of matroids 
Rincon, Felipe; Lopez de Medrano, Lucia; Shaw, Kristin (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We define Chern–Schwartz–MacPherson (CSM) cycles of an arbitrary matroid. These are balanced weighted fans supported on the skeleta of the corresponding Bergman fan. In the case that the matroid arises from a complex ...
Majorization for (0,1)-matrices 
Dahl, Geir; Guterman, Alexander; Shteyner, Pavel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Robust preconditioning for coupled Stokes–Darcy problems with the Darcy problem in primal form 
Holter, Karl Erik; Kuchta, Miroslav; Mardal, Kent-Andre (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The coupled Darcy–Stokes problem is widely used for modeling fluid transport in physical systems consisting of a porous part and a free part. In this work we consider preconditioners for monolithic solution algorithms of ...
Seasonal and pandemic influenza during pregnancy and risk of fetal death: A Norwegian registry‑based cohort study 
Gunnes, Nina; Gjessing, Håkon K.; Bakken, Inger Johanne Landsjøåsen; Ghaderi, Sara; Gran, Jon Michael; Hungnes, Olav; Magnus, Per; Samuelsen, Sven Ove; Skrondal, Anders; Stoltenberg, Camilla; Trogstad, Lill; Wilcox, Allen James; Håberg, Siri Eldevik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Previous studies of fetal death with maternal influenza have been inconsistent. We explored the effect of maternal influenza-like illness (ILI) in pregnancy on the risk of fetal death, distinguishing between diagnoses ...
More efficient time integration for Fourier pseudospectral DNS of incompressible turbulence 
Ketcheson, David I.; Mortensen, Mikael; Parsani, Matteo; Schilling, Nathanael (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Time integration of Fourier pseudospectral DNS is usually performed using the classical fourth‐order accurate Runge‐Kutta method or other second‐ or third‐order methods, with a fixed step size. We investigate the use of ...
Pricing of commodity derivatives on processes with memory 
Benth, Fred Espen; Khedher, Asma; Vanmaele, Michèle (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Spot option prices, forwards and options on forwards relevant for the commodity markets are computed when the underlying process S is modelled as an exponential of a process ξ with memory as, e.g., a Volterra equation ...
AIS-Based Multiple Vessel Collision and Grounding Risk Identification based on Adaptive Safety Domain 
Bakdi, Azzeddine; Glad, Ingrid Kristine; Vanem, Erik; Engelhardtsen, Øystein (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The continuous growth in maritime traffic and recent developments towards autonomous navigation have directed increasing attention to navigational safety in which new tools are required to identify real-time risk and complex ...
Existence of weak solutions to the Keller-Segel chemotaxis system with additional cross-diffusion 
Arumugam, Gurusamy; Erhardt, André Henrik; Eswaramoorthy, Indurekha; Krishnan, Balachandran (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
In this paper, we consider the Keller–Segel chemotaxis system with additional cross-diffusion term in the second equation. This system is consisting of a fully nonlinear reaction–diffusion equations with additional ...
The Fourier-Stieltjes algebra of a C*-dynamical system II 
Bedos, Erik Christopher; Conti, Roberto (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We continue our study of the Fourier–Stieltjes algebra associated to a twisted (unital, discrete) C*-dynamical system and discuss how the various notions of equivalence of such systems are reflected at the algebra level. ...
The cure model in perinatal epidemiology 
Stoltenberg, Emil Aas; Nordeng, Hedvig Marie Egeland; Ystrøm, Eivind; Samuelsen, Sven Ove (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
In the statistical literature, the class of survival analysis models known as cure models has received much attention in recent years. Cure models seem not, however, to be part of the statistical toolbox of perinatal ...
The Braess' paradox for pendent twins 
Ciardo, Lorenzo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Kemeny's constant κ(G) of a connected undirected graph G can be interpreted as the expected transit time between two randomly chosen vertices for the Markov chain associated with G. In certain cases, inserting a new edge ...
Effects of rotational submarine slump dynamics on tsunami-genesis – new insight from idealized models and the 1929 Grand Banks event 
Zengaffinen, Thomas; Løvholt, Finn; Pedersen, Geir Kleivstul; Harbitz, Carl Bonnevie (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Sediment slumps are known to have generated important tsunamis such as the 1998 Papua New Guinea (PNG) and the 1929 Grand Banks events. Tsunami modellers commonly use solid blocks with short run-out distances to simulate ...
Poincaré-Friedrichs inequalities of complexes of discrete distributional differential forms 
Christiansen, Snorre H; Licht, Martin Werner (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We derive bounds for the constants in Poincaré–Friedrichs inequalities with respect to mesh-dependent norms for complexes of discrete distributional differential forms. A key tool is a generalized flux reconstruction which ...
A Novel Algorithmic Approach to Bayesian Logic Regression 
Hubin, Aliaksandr; Storvik, Geir Olve; Frommlet, Florian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Logic regression was developed more than a decade ago as a tool to construct predictors from Boolean combinations of binary covariates. It has been mainly used to model epistatic effects in genetic association studies, ...
On deformations of quintic and septic hypersurfaces 
Ottem, John Christian; Schreieder, Stefan (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
An old question of Mori asks whether in dimension at least three, any smooth specialization of a hypersurface of prime degree is again a hypersurface. A positive answer to this question is only known in degrees two and ...
Failure of the integral Hodge conjecture for threefolds of Kodaira dimension zero 
Ottem, John Christian; Benoist, Olivier (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We prove that the product of an Enriques surface and a very general curve of genus at least 1 does not satisfy the integral Hodge conjecture for 1-cycles. This provides the first examples of smooth projective complex ...
Twenty-seven questions about the cubic surface 
Ranestad, Kristian; Sturmfels, Bernd (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We present a collection of research questions on cubic surfaces in 3-space. These questions inspired the present collection of papers. This article serves as the introduction to the issue. The number of questions is meant ...
Existence of weak solutions to a certain homogeneous parabolic Neumann problem involving variable exponents and cross-diffusion 
Arumugam, Gurusamy; Erhardt, André Henrik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
This paper deals with a homogeneous Neumann problem of a nonlinear diffusion system involving variable exponents dependent on spatial and time variables and cross-diffusion terms. We prove the existence of weak solutions ...
Granular viscosity from plastic yield surfaces: The role of the deformation type in granular flows 
Rauter, Matthias; Barker, T.; Fellin, W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Numerical simulations of granular flows with Navier–Stokes type models emerged in the last decade, challenging the well established depth-averaged models. The structure of these equations allows for extension to general ...
Towards definition of the risk premium function 
Krecar, Nikola; Benth, Fred Espen; Gubina, Andrej (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Successful trading in electricity markets relies on the market actor's ability to accurately forecast the electricity price. The fundamental electricity price models use market information, provided by various price drivers, ...
Variance and interest rate risk in unit-linked insurance policies 
Baños, David; Lagunas, Marc; Ortiz-Latorre, Salvador (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
One of the risks derived from selling long-term policies that any insurance company has arises from interest rates. In this paper, we consider a general class of stochastic volatility models written in forward variance ...
Strengthened convexity of positive operator monotone decreasing functions 
Kirihata, Megumi; Yamashita, Makoto (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We prove a strengthened form of convexity for operator monotone decreasing positive functions defined on the positive real numbers. This extends Ando and Hiai's work to allow arbitrary positive maps instead of states (or ...
Bayesian seismic inversion for stratigraphic horizon, lithology, and fluid prediction 
Kolbjørnsen, Odd; Buland, Arild; Hauge, Ragnar; Røe, Per; Ndingwan, Abel Onana; Aker, Eyvind (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We have developed an efficient methodology for Bayesian prediction of lithology and pore fluid, and layer-bounding horizons, in which we include and use spatial geologic prior knowledge such as vertical ordering of ...
Backtracking Gradient Descent Method and Some Applications in Large Scale Optimisation. Part 2: Algorithms and Experiments 
Truong, Tuyen Trung; Nguyen, Hang-Tuan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
In this paper, we provide new results and algorithms (including backtracking versions of Nesterov accelerated gradient and Momentum) which are more applicable to large scale optimisation as in Deep Neural Networks. We also ...
Geometric and arithmetic properties of motivic cohomology theories 
Kolderup, Håkon (Doctoral thesis / Doktoravhandling, 2020)
Fully-dynamic risk-indifference prices and no-good-deal bounds 
Bion-Nadal, Jocelyne; Di Nunno, Giulia (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
The seller's risk-indifference price evaluation is studied. We propose a dynamic risk-indifference pricing criterion derived from fully-dynamic risk measures on the $L_p$-spaces for $p\in [1,\infty]$. The concept of ...
DNA copy number motifs are strong and independent predictors of survival in breast cancer 
Pladsen, Arne Valebjørg; Nilsen, Gro; Rueda, Oscar M.; Aure, Miriam Ragle; Borgan, Ørnulf; Liestøl, Knut; Vitelli, Valeria; Frigessi Di Rattalma, Arnoldo; Langerød, Anita; Mathelier, Anthony; Engebråten, Olav; Kristensen, Vessela N.; Wedge, David C.; Van Loo, Peter; Caldas, Carlos; Børresen-Dale, Anne-Lise; Russnes, Hege Elisabeth Giercksky; Lingjærde, Ole Christian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Somatic copy number alterations are a frequent sign of genome instability in cancer. A precise characterization of the genome architecture would reveal underlying instability mechanisms and provide an instrument for outcome ...
Experiments on air entrainment produced by a circular free falling jet 
Ramirez De La Torre, Reyna Guadalupe; Jensen, Atle; Kuchta, Miroslav (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The process of a circular free falling jet entering an idle pool was studied with the objective of determining a relation between the naturally occurring disturbances on the jet surface and air entrainment. To this end the ...
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 ...
Robust active flow control over a range of Reynolds numbers using an artificial neural network trained through deep reinforcement learning 
Tang, Hongwei; Rabault, Jean; Kuhnle, Alexander; Wang, Yan; Wang, Tongguang (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
This paper focuses on the active flow control of a computational fluid dynamics simulation over a range of Reynolds numbers using deep reinforcement learning (DRL). More precisely, the proximal policy optimization (PPO) ...
Modelling extreme claims via composite models and threshold selection methods 
Wang, Yinzhi; Hobæk Haff, Ingrid; Huseby, Arne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The existence of large and extreme claims of a non-life insurance portfolio influences the ability of (re)insurers to estimate the reserve. The excess over-threshold method provides a way to capture and model the typical ...
First-Order Concatenation Theory with Bounded Quantifiers 
Kristiansen, Lars; Murwanashyaka, Juvenal (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We study first-order concatenation theory with bounded quantifiers. We give axiomatizations with interesting properties, and we prove some normal-form results. Finally, we prove a number of decidability and undecidability results.
Real algebraic curves on real del Pezzo surfaces 
Manzaroli, Matilde (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Abstract The study of the topology of real algebraic varieties dates back to the work of Harnack, Klein, and Hilbert in the 19th century; in particular, the isotopy-type classification of real algebraic curves ...
Selection of variables for multivariable models: opportunities and limitations in quantifying model stability by resampling 
Wallisch, Christine; Dunkler, Daniela; Rauch, Geraldine; De Bin, Riccardo; Heinze, Georg (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Statistical models are often fitted to obtain a concise description of the association of an outcome variable with some covariates. Even if background knowledge is available to guide preselection of covariates, stepwise ...
Regularization Effects for Certain Dynamical Systems through Gaussian Noises 
Amine, Oussama (Doctoral thesis / Doktoravhandling, 2020)
It is well known that randomness can be used as an effective tool to turn a priori ill-posed problems into well-posed ones. This is useful both for answering questions at the theoretical as well as the practical levels. ...
Modeling and estimation of stochastic transition rates in life insurance with regime switching based on generalized Cox processes 
Banos, David; Bølviken, Erik; Duedahl, Sindre; Proske, Frank Norbert (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
In this paper we aim at modeling stochastic transition rates of state processes in life insurance by using generalized Cox processes. A feature of a our non-Gaussian model is that it can be used to capture ‘regime switching’ ...
Computations in A1-homotopy theory. Contractibility and enumerative geometry 
Pauli, Sabrina (Doctoral thesis / Doktoravhandling, 2020)
Remarks on the positivity of the cotangent bundle of a K3 surface 
Ottem, John Christian; Gounelas, Frank (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Using recent results of Bayer–Macrì, we compute in many cases the pseudoeffective and nef cones of the projectivised cotangent bundle of a smooth projective K3 surface. We then use these results to construct explicit ...
Accounting for grouped predictor variables or pathways in high-dimensional penalized Cox regression models 
Belhechmi, Shaima; Bin, Riccardo D; Rotolo, Federico; Michiels, Stefan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Background The standard lasso penalty and its extensions are commonly used to develop a regularized regression model while selecting candidate predictor variables on a time-to-event outcome in high-dimensional ...
Stability and accuracy in compressive sensing and deep learning 
Antun, Vegard (Doctoral thesis / Doktoravhandling, 2020)
There are currently two paradigm shifts happening in society and scientific computing: (1) Artificial Intelligence (AI) is replacing humans in problem solving, and, (2) AI is replacing the standard algorithms in computational ...
Patient-specific Modeling of the Human Brain using Magnetic Resonance Imaging 
Valnes, Lars Magnus (Doctoral thesis / Doktoravhandling, 2020)
Dementia is a growing concern for the health-care in the world and most treatment strategies are not successful. Dementia is associated with accumulation of metabolic waste in the form of protein fragments. Recent breakthroughs ...
Statistical sightings of better angels: Analysing the distribution of battle-deaths in interstate conflict over time 
Cunen, Celine Marie Løken; Hjort, Nils Lid; Nygård, Håvard Mokleiv (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Have great wars become less violent over time, and is there something we might identify as the long peace? We investigate statistical versions of such questions, by examining the number of battle-deaths in the Correlates ...
Confidence in confidence distributions! 
Cunen, Celine; Hjort, Nils Lid; Schweder, Tore (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
The recent article ‘Satellite conjunction analysis and the false confidence theorem’ (Balch et al. 2019, Satellite conjunction analysis and the false confidence theorem. Proc. R. Soc. A475, 20180565) points to certain ...
Psychometrics and the modelling of publication bias 
Moss, Jonas (Doctoral thesis / Doktoravhandling, 2020)
Towards the degree of the PGL(4)-orbit of a cubic surface 
Cazzador, Elisa; Skauli, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We study the action of the group PGL(4) on the parameter space P 19 of complex cubic surfaces. Specifically, we look at how the techniques used by Aluffi and Faber in [1] can be extended to compute the degree of the orbit ...
The homological projective dual of Sym2 P(V) 
Rennemo, Jørgen Vold (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We study the derived category of a complete intersection X of bilinear divisors in the orbifold Sym2P(V) . Our results are in the spirit of Kuznetsov’s theory of homological projective duality, and we describe a homological ...
Focused model selection for linear mixed models with an application to whale ecology 
Cunen, Celine; Hjort, Nils Lid; Walløe, Lars (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
A central point of disagreement, in certain long-standing discussions about a particular whaling dataset in the Scientific Committee of the International Whaling Commission, has directly involved model selection issues for ...
Comparative effectiveness of dopamine agonists and monoamine oxidase type-B inhibitors for Parkinson’s disease: a multiple treatment comparison meta-analysis 
Binde, Caroline Ditlev; Tvete, Ingunn Fride; Gåsemyr, Jørund Inge; Natvig, Bent; Klemp, Marianne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Abstract Purpose To investigate the comparative effectiveness of dopamine agonists and monoamine oxidase type-B (MAO-B) inhibitors available for treatment of Parkinson’s disease. ...
Experimental evidence for a universal threshold characterizingwave-induced sea ice break-up 
Voermans, Joey; Rabault, Jean; Filchuk, Kirill V.; Ryzhov, Ivan; Heil, Petra; Marchenko, Aleksey; Collins, Clarence O.; dabboor, mohammed; Sutherland, Graig J.; Babanin, Alexander V. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Waves can drastically transform a sea ice cover by inducing break-up over vast distances in the course of a few hours. However, relatively few detailed studies have described this phenomenon in a quantitative manner, and ...
Predicting time to graduation at a large enrollment American university 
Aiken, John Mark; De Bin, Riccardo; Hjorth-Jensen, Morten; Caballero, Marcos Daniel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The time it takes a student to graduate with a university degree is mitigated by a variety of factors such as their background, the academic performance at university, and their integration into the social communities of ...
Experimental investigations of two-phase flows. Dynamics of stratified and particle-laden flows in pipes and flumes 
Vollestad, Petter (Doctoral thesis / Doktoravhandling, 2020)
Airflow above water waves represents a challenging problem, relevant both in air-sea interactions and for multiphase pipe flows. Understanding this interaction is important to accurately predict the exchange of heat, ...
Automorphisms of Hilbert schemes of points on surfaces 
Belmans, Pieter; Oberdieck, Georg; Rennemo, Jørgen Vold (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We show that every automorphism of the Hilbert scheme of n points on a weak Fano or general type surface is natural, i.e., induced by an automorphism of the surface, unless the surface is a product of curves and n=2. In ...
Confidence Distributions for FIC Scores 
Cunen, Celine; Hjort, Nils Lid (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
When using the Focused Information Criterion (FIC) for assessing and ranking candidate models with respect to how well they do for a given estimation task, it is customary to produce a so-called FIC plot. This plot has the ...
  • «
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • . . .
  • 28
  • »
 
Responsible for this website 
University of Oslo Library


Contact Us 
duo-hjelp@ub.uio.no


Privacy policy
 

 

For students / employeesSubmit master thesisAccess to restricted material

Browse

All of DUOCommunities & CollectionsBy Issue DateAuthorsTitlesThis CollectionBy Issue DateAuthorsTitles

For library staff

Login

Discover

Date Issued2020 - 2022 (384)2010 - 2019 (692)2000 - 2009 (455)1990 - 1999 (463)1980 - 1989 (258)1970 - 1979 (349)1960 - 1969 (100)1937 - 1939 (1)Document TypeForskningsrapport (1677)Tidsskriftartikkel (870)Doktoravhandling (91)Bokkapittel (38)Serietittel (7)Bok (3)Konferansebidrag (1)... View MoreAuthorØksendal, Bernt (187)Benth, Fred Espen (98)Hjort, Nils Lid (78)Natvig, Bent (72)Karlsen, Kenneth H. (51)... View MorePeer ReviewedPeer reviewed (833)
RSS Feeds
feedRSS 2.0
 
Responsible for this website 
University of Oslo Library


Contact Us 
duo-hjelp@ub.uio.no


Privacy policy