Zobrazeno 1 - 10
of 18 533
pro vyhledávání: '"Nordström, A."'
Autor:
Nordström, Jan, Malan, Arnaud. G.
We show that a reformulation of the governing equations for incompressible multi-phase flow in the volume of fluid setting leads to a well defined energy rate. Weak nonlinear inflow-outflow and solid wall boundary conditions complement the developmen
Externí odkaz:
http://arxiv.org/abs/2406.19525
We introduce a novel construction procedure for one-dimensional summation-by-parts (SBP) operators. Existing construction procedures for FSBP operators of the form $D = P^{-1} Q$ proceed as follows: Given a boundary operator $B$, the norm matrix $P$
Externí odkaz:
http://arxiv.org/abs/2405.08770
We show that even though the Discontinuous Galerkin Spectral Element Method is stable for hyperbolic boundary-value problems, and the overset domain problem is well-posed in an appropriate norm, the energy of the approximation is bounded by data only
Externí odkaz:
http://arxiv.org/abs/2405.04668
We present a novel solution procedure for initial boundary value problems. The procedure is based on an action principle, in which coordinate maps are included as dynamical degrees of freedom. This reparametrization invariant action is formulated in
Externí odkaz:
http://arxiv.org/abs/2404.18676
Autor:
Ihalainen, Hannes, Oertel, Andy, Tan, Yong Kiam, Berg, Jeremias, Järvisalo, Matti, Nordström, Jakob
Building on the progress in Boolean satisfiability (SAT) solving over the last decades, maximum satisfiability (MaxSAT) has become a viable approach for solving NP-hard optimization problems, but ensuring correctness of MaxSAT solvers has remained an
Externí odkaz:
http://arxiv.org/abs/2404.17316
Autor:
Nordström, Jan
Publikováno v:
Journal of Computational Physics 512 (2024) 113145
We show that a specific skew-symmetric formulation of the nonlinear terms in the compressible Navier-Stokes equations leads to an energy rate in terms of surface integrals only. No dissipative volume integrals contribute to the energy rate. We also d
Externí odkaz:
http://arxiv.org/abs/2401.12038
It is well known that reformulating the original problem can be crucial for the performance of mixed-integer programming (MIP) solvers. To ensure correctness, all transformations must preserve the fea sibility status and optimal value of the problem,
Externí odkaz:
http://arxiv.org/abs/2401.09277
Autor:
Rothkopf, Alexander, Nordström, Jan
In a recently developed variational discretization scheme for second order initial value problems ( J. Comput. Phys. 498, 112652 (2024) ), it was shown that the Noether charge associated with time translation symmetry is exactly preserved in the inte
Externí odkaz:
http://arxiv.org/abs/2312.09772
Autor:
Rolfsnes, Erlend Sortland, Thangngat, Philip, Eftestøl, Trygve, Nordström, Tobias, Jäderling, Fredrik, Eklund, Martin, Fernandez-Quilez, Alvaro
Magnetic resonance imaging has evolved as a key component for prostate cancer (PCa) detection, substantially increasing the radiologist workload. Artificial intelligence (AI) systems can support radiological assessment by segmenting and classifying l
Externí odkaz:
http://arxiv.org/abs/2309.08381
Leveraging multi-view data without annotations for prostate MRI segmentation: A contrastive approach
Autor:
Lindeijer, Tim Nikolass, Ytredal, Tord Martin, Eftestøl, Trygve, Nordström, Tobias, Jäderling, Fredrik, Eklund, Martin, Fernandez-Quilez, Alvaro
An accurate prostate delineation and volume characterization can support the clinical assessment of prostate cancer. A large amount of automatic prostate segmentation tools consider exclusively the axial MRI direction in spite of the availability as
Externí odkaz:
http://arxiv.org/abs/2308.06477