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Now showing items 3701-3771 of 3771
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Data simulation is fundamental for machine learning and causal inference, as it allows exploration of scenarios and assessment of methods in settings with full control of ground truth. Directed acyclic graphs (DAGs) are ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
In this paper, we present a comprehensive survey of continuous stochastic volatility models, discussing their historical development and the key stylized facts that have driven the field. Special attention is dedicated to ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The instability and vortex shedding in the bottom boundary layer caused by internal solitary waves of depression propagating along a shallow pycnocline of a fluid are computed by finite-volume code in two dimensions. The ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
The present paper investigates Cox-Ingersoll-Ross (CIR) processes of dimension less than 1, with a focus on obtaining an equation of a new type including local times for the square root of the CIR process. To derive this ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Freak or rogue waves are unexpectedly and abnormally large waves in seas and oceans, which can cause loss of human lives and damage to ships, oil platforms, and coastal structures. Evidence of such waves is widely spread ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
In this study, we present a formal defnition of the probabilistic digital twin (PDT). Digital twins are emerging in many industries, typically consisting of simulation models and data associated with a specifc physical ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract
We classify the singularities in the unframed Nakajima quiver varieties associated with extended Dynkin quivers and the corresponding minimal imaginary root with a small restriction on the parameters and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract We formulate a hybridizable discontinuous Galerkin method for parabolic equations with non-linear tensor-valued coefficients and jump conditions (Henry’s law). The analysis of the proposed scheme indicates the ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
We prove a version of Pedersen’s outer conjugacy theorem for coactions of compact groups, which characterizes outer conjugate coactions of a compact group in terms of properties of the dual actions. In fact, we show that ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Let G be a compact quantum group. We show that given a G-equivariant C∗-correspondence E, the Pimsner algebra OE can be naturally made into a G-C∗-algebra. We also provide sufficient conditions under which it is guaranteed ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
Millions of tonnes of explosive remnants of war remain in nature, and the volume is continuously growing. The explosive legacy of wars represents an increasing threat to the environment and to societal safety and security. ...
(Journal article / Tidsskriftartikkel / SubmittedVersion, 2023)
We introduce the software toolbox HAZniCS for solving interface-coupled multiphysics problems. HAZniCS is a suite of modules that combines the well-known FEniCS framework for finite element discretization with solver and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The stochastic Euler-Poincaré equations with pseudo-differential/multiplicative noise are considered in this work. We first establish two new cancellation properties on pseudo-differential operators, which considerably ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
(Journal article / Tidsskriftartikkel / SubmittedVersion, 2023)
Background
Electroconvulsive therapy (ECT) is an effective treatment against severe depressive episodes, which has been shown to induce volume changes in the hippocampus. The power spectrum of the electroencephalogram ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
In this paper we discuss a conjecture of Schumaker that the principal submatrices of collocation matrices of bivariate Bernstein polynomials over triangular grids have positive determinant. It is easy to show that the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract
Functional-structural root architecture models have evolved as tools for the design of improved agricultural management practices and for the selection of optimal root traits. In order to test their ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract The number of fully electric or hybrid ships relying on battery power for propulsion and maneuvering is growing. In order to ensure the safety of these ships, it is important to monitor the capacity that can be ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
This paper introduces SPDE bridges with observation noise and contains an analysis of their spatially semidiscrete approximations. The SPDEs are considered in the form of mild solutions in an abstract Hilbert space framework ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Living systems are chiral on multiple scales, from constituent biopolymers to large scale morphology, and their active mechanics is both driven by chiral components and serves to generate chiral morphologies. We describe ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
In this paper, we consider the noise effects on a class of stochastic evolution equations including the stochastic Camassa–Holm equations with or without rotation. We first obtain the existence, uniqueness and a blow-up ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We propose a novel stochastic time series model able to explain the stylized features of daily irradiation level data in 5 cities in Germany. The model is suitable for applications to risk management of photovoltaic power ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract This paper is concerned with managing risk exposure to temperature using weather derivatives. We consider hedging temperature risk using so‐called HDD‐ and CDD‐index futures, which are instruments written on ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We apply our previous work on the relation between groupoid homology and K-theory to Smale spaces. More precisely, we consider the unstable equivalence relation of a Smale space with totally disconnected stable sets and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Internal solitary waves (ISWs) of large amplitude moving in the coastal ocean induce sizeable horizontal velocities above the sea bed. In turn, these give rise to instability and vortex formation in the bottom boundary ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The glymphatic system is the subject of numerous pieces of research in biology. Mathematical modelling plays a considerable role in this field since it can indicate the possible physical effects of this system and validate ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We develop an approach for two-player constraint zero-sum and nonzero-sum stochastic differential games, which are modeled by Markov regime-switching jump-diffusion processes. We provide the relations between a usual ...
(Doctoral thesis / Doktoravhandling, 2024)
Machine learning is emerging as a promising approach broad range of modelling applications. One of these applications is soft-sensing in industrial processes. Soft-sensors are mathematical models that predict process-related ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract In this paper we aim at generalizing the results of A. K. Zvonkin ( That removes the drift , 22 , 129, 41) and A. Y. Veretennikov ( Theory Probab. Appl. , 24 , 354, 39) on the construction of unique strong solutions ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We consider a nonlinear stochastic partial differential equation (SPDE) that takes the form of the Camassa–Holm equation perturbed by a convective, position-dependent, noise term. We establish the first global-in-time ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The paper paper examines columns of elastic frames that are able to displace laterally under axial load. Columns on the same level (story) of such frames may contribute to lateral support (stability) or require lateral ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
The vascular tree is crucial for the survival and function of large living tissues. Despite breakthroughs in 3D bioprinting to endow engineered tissues with large blood vessels, there is currently no approach to engineer ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Background Occupational exposures constitute the second leading cause of urinary bladder cancer after tobacco smoking. Increased risks have been found in the petroleum industry, but high-quality exposure data are needed ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
Objective The objective of our study was to examine whether occupational exposure to benzene is associated with lung cancer among males in the Norwegian Offshore Petroleum Workers cohort. Methods Among 25 347 male offshore ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Perivascular spaces are important highways for fluid and solute transport in the brain enabling efficient waste clearance during sleep. However, the underlying mechanisms augmenting perivascular flow in sleep are unknown. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
This paper presents a new efficient algorithm based on the spectral-Galerkin numerical approximations complemented by a magnetohydrodynamics–Boussinesq model and a new solver for studying the development of a Rayleigh–Taylor ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
This paper studies the problem of recovering cameras from a set of fundamental matrices. A set of fundamental matrices is said to be compatible if a set of cameras exists for which they are the fundamental matrices. We ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Solution methods for the nonlinear PDE of the Rudin–Osher–Fatemi (ROF) and minimum-surface models are fundamental for many modern applications. Many efficient algorithms have been proposed. First-order methods are common. ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2024)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
SUMMARY The Earth’s rotation exhibits periodic variations as a result of gravitational torques exerted by the Sun and the Moon and of angular momentum exchange of the solid Earth with the Earth’s atmosphere and hydrosphere. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Motivated by a problem of optimal harvesting of natural resources, we study a control problem for Volterra type dynamics driven by time-changed Lévy noises, which are in general not Markovian. To exploit the nature of the ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
We have studied the liquid-like response of the surface of vapor-deposited glassy films of polystyrene to the introduction of gold nanoparticles on the surface. The build-up of polymer material was measured as a function ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
The purpose of this paper is to study optimal control of conditional McKean–Vlasov (mean-field) stochastic differential equations with jumps (conditional McKean–Vlasov jump diffusions, for short). To this end, we first ...
(Master thesis / Masteroppgave, 2023)
We review the classical theory of apolarity and investigate its applications in relation to power sum decompositions. Higher order polars admits, in a natural way, a duality between graded symmetric algebras. This duality ...
(Master thesis / Masteroppgave, 2023)
Synthetic data has gained attention over the last years because of its ability to safeguard the privacy of real data points while still ensuring data utility. These properties are beneficial in many domains and sectors ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
A neural network consisting of piecewise affine building blocks, such as fully-connected layers and ReLU activations, is itself a piecewise affine function supported on a polyhedral complex. This complex has been previously ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract
Continuous monitoring of mean intracranial pressure (ICP) has been an essential part of neurocritical care for more than half a century. Cerebrospinal pressure–volume compensation, i.e. the ability of ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We consider the typical workflow of a route planner in the context of short-term train timetabling, that is, the incremental process of adjusting a timetable for the next day or up to the next year. This process usually ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We define higher pro-Albanese functors for every effective log motive over a field k of characteristic zero, and we compute them for every smooth log smooth scheme X = (X, ∂X). The result involves an inverse system of the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
The motivation for this study is to investigate the abilities and limitations of a Nortek Signature1000 acoustic Doppler current profiler (ADCP) regarding fine-scale turbulence measurements. Current profilers offer the ...
(Master thesis / Masteroppgave, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
There are sparse opportunities for direct measurement of upper stratospheric winds, yet improving their representation in subseasonal-to-seasonal prediction models can have significant benefits. There is solid evidence ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We define a new Gromov–Witten theory relative to simple normal crossing divisors as a limit of Gromov–Witten theory of multi-root stacks. Several structural properties are proved including relative quantum cohomology, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
We present four approximation theorems for manifold–valued mappings. The first one approximates holomorphic embeddings on pseudoconvex domains in Cn with holomorphic embeddings with dense images. The second theorem ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
We prove that any symplectic automorphism of finite order on a manifold of type OG6 acts trivially on the Beauville–Bogomolov–Fujiki lattice and that any birational transformation of finite order acts trivially on its ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
Prenatal maternal stressful life events are associated with adverse neurodevelopmental outcomes in offspring. Biological mechanisms underlying these associations are largely unknown, but DNA methylation likely plays a role. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We investigate experimentally the effect of wind on the dynamics of a viscous liquid film flowing down a thread. The liquid film is well known to destabilize into an axisymmetric bead-like pattern in stagnant air. When the ...
(Journal article / Tidsskriftartikkel / SubmittedVersion, 2024)
We develop multilevel methods for interface-driven multiphysics problems that can be coupled across dimensions and where complexity and strength of the interface coupling deteriorates the performance of standard methods. ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
We develop a multigrid solver for the second biharmonic problem in the context of Isogeometric Analysis (IgA), where we also allow a zero-order term. In a previous paper, the authors have developed an analysis for the first ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The purpose of this paper is to establish a stochastic differential equation for the Donsker delta measure of the solution of a McKean–Vlasov (mean-field) stochastic differential equation.
If the Donsker delta measure is ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
Zero-knowledge succinct non-interactive arguments of knowledge (zk-SNARKs) are the most efficient proof systems in terms of proof size and verification. Currently, Groth’s scheme from EUROCRYPT 2016, Groth16, is the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract This paper deals with a class of optimal control problems which arises in advertising models with Volterra Ornstein-Uhlenbeck process representing the product goodwill. Such choice of the model can be regarded as ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We consider optimal control of a new type of non-local stochastic partial differential equations (SPDEs). The SPDEs have space interactions , in the sense that the dynamics of the system at time t and position in space x ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Existence and uniqueness of solutions to the stochastic heat equation with multiplicative spatial noise is studied. In the spirit of pathwise regularization by noise, we show that a perturbation by a sufficiently irregular ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
There are few computational and methodological tools available for the analysis of general multi-state models with interval censoring. Here, we propose a general framework for parametric inference with interval censored ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2024)
Nonlinear scalar conservation laws are traditionally viewed as transport equations. We take instead the viewpoint of these PDEs as continuity equations with an implicitly defined velocity field. We show that a weak solution ...