Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Erkki Heikkola"'
Publikováno v:
SIAM Journal on Scientific Computing. 41:C505-C521
An efficient domain decomposition method and its parallel implementation for the solution of the Helmholtz equation in three-dimensional layered media are considered. A modified trilinear finite el...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b76c611fa0028a5dc0a8adad8c6b0dbf
https://doi.org/10.1137/18m1230906
https://doi.org/10.1137/18m1230906
Publikováno v:
Ultrasound in Medicine and Biology. 39(7):1223-1232
The fundamental flexural guided wave (FFGW), as modeled, for example, by the A0 Lamb mode, is a clinically useful indicator of cortical bone thickness. In the work described in this article, we tested so-called multiridge-based analysis, based on the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aeb0b64cf9da7615872bcfe49f1c3423
https://doi.org/10.1016/j.ultrasmedbio.2013.02.002
https://doi.org/10.1016/j.ultrasmedbio.2013.02.002
Autor:
Tuomas Airaksinen, Erkki Heikkola
Publikováno v:
The Journal of the Acoustical Society of America. 130:1359-1369
This paper considers the combined use of a hybrid numerical method for the modeling of acoustic mufflers and a genetic algorithm for multiobjective optimization. The hybrid numerical method provides accurate modeling of sound propagation in uniform w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f34c6292bac244011bde171be3457c86
https://doi.org/10.1121/1.3621119
https://doi.org/10.1121/1.3621119
Publikováno v:
Journal of Computational Acoustics. 19:205-219
A numerical method for optimizing the local control of sound in a stochastic domain is developed. A three-dimensional enclosed acoustic space, for example, a cabin with acoustic actuators in given locations is modeled using the finite element method
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b79f5af4c4fae7e08d860ce61f822e7
https://doi.org/10.1142/s0218396x11004432
https://doi.org/10.1142/s0218396x11004432
Publikováno v:
Journal of Computational Physics. 226:1196-1210
A preconditioner defined by an algebraic multigrid cycle for a damped Helmholtz operator is proposed for the Helmholtz equation. This approach is well suited for acoustic scattering problems in complicated computational domains and with varying mater
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c748748c447c1ba36070a5e502bb5fbe
https://doi.org/10.1016/j.jcp.2007.05.013
https://doi.org/10.1016/j.jcp.2007.05.013
Publikováno v:
Journal of Computational Physics. 225:1553-1576
We consider a controllability technique for the numerical solution of the Helmholtz equation. The original time-harmonic equation is represented as an exact controllability problem for the time-dependent wave equation. This problem is then formulated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d457a201964f0513f1f55ad6e9514f93
https://doi.org/10.1016/j.jcp.2007.02.003
https://doi.org/10.1016/j.jcp.2007.02.003
Publikováno v:
Ultrasonics. 44:368-380
The optimal design of an ultrasonic transducer is a multiobjective optimization problem since the final outcome needs to satisfy several conflicting criteria. Simulation tools are often used to avoid expensive and time-consuming experiments, but even
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09b94709a6836389f2da38b665f9f9e8
https://doi.org/10.1016/j.ultras.2006.04.004
https://doi.org/10.1016/j.ultras.2006.04.004
Autor:
Tommi Kärkkäinen, Erkki Heikkola
Publikováno v:
Neural Computation. 16:837-862
The connection between robust statistical estimates and nonsmooth optimization is established. Based on the resulting family of optimization problems, robust learning problem formulations with regularization-based control on the model complexity of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2e43edc611e2e282a24a4b81bd5e414
https://doi.org/10.1162/089976604322860721
https://doi.org/10.1162/089976604322860721
Publikováno v:
Lilja, J, Marjomäki, T J, Jurvelius, J, Rossi, T & Heikkola, E 2004, ' Simulation and experimental measurement of side-aspect target strength of Atlantic salmon ( Salmo salar ) at high frequency ', Canadian Journal of Fisheries and Aquatic Sciences, vol. 61, no. 11, pp. 2227-2236 . https://doi.org/10.1139/f04-166
Numerical simulations and empirical measurements of swimming Atlantic salmon (Salmo salar) were used to describe the effects of fish behavior on side-aspect target strength (TS). Simulation results were based on the numerical solution of the Helmholt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::feae98d99ae05c0b89f498516fb3a2b7
https://doi.org/10.1139/f04-166
https://doi.org/10.1139/f04-166
Publikováno v:
Journal of Computational Acoustics. 11:159-174
The efficient numerical solution of the exterior Helmholtz equation modeling the acoustic scattering by an obstacle is considered. The exterior problem is approximated by truncating the domain with a rectangular boundary and using either a perfectly
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae243eb0b9900b26f92d5de941d2d979
https://doi.org/10.1142/s0218396x03001869
https://doi.org/10.1142/s0218396x03001869