Search results for "spektrianalyysi"
showing 5 items of 5 documents
MATLAB codes implementing the generalized cross-wavelet transform (GXWT) algorithm described in the paper "Analyzing multidimensional movement intera…
2021
MATLAB codes implementing the generalized cross-wavelet transform (GXWT) algorithm described in the paper "Analyzing multidimensional movement interaction with generalized cross-wavelet transform" (Toiviainen & Hartmann, 2021). Basic workflow for multivariate (time by channel) signals d1 and d2: [w1,f] = cwtensor(d1,FS,MINF,MAXF); [w2,f] = cwtensor(d2,FS,MINF,MAXF); [xs p1 p2] = getxwt(w1,w2); NOTE: cwtensor.m requires the Wavelet Toolbox for MATLAB.
Spectral analysis and quantum chaos in two-dimensional nanostructures
2015
This thesis describes a study into the eigenvalues and eigenstates of twodimensional (2D) quantum systems. The research is summarized in four scientific publications by the author. The underlying motivation for this work is the grand question of quantum chaos: how does chaos, as known in classical mechanics, manifest in quantum mechanics? The search and analysis of these quantum fingerprints of chaos requires efficient numerical tools and methods, the development of which is given a special emphasis in this thesis. The first publication in this thesis concerns the eigenspectrum analysis of a nanoscale device. It is shown that a measured addition energy spectrum can be explained by a simple …
Assessment of nonnegative matrix factorization algorithms for electroencephalography spectral analysis.
2020
AbstractBackgroundNonnegative matrix factorization (NMF) has been successfully used for electroencephalography (EEG) spectral analysis. Since NMF was proposed in the 1990s, many adaptive algorithms have been developed. However, the performance of their use in EEG data analysis has not been fully compared. Here, we provide a comparison of four NMF algorithms in terms of accuracy of estimation, stability (repeatability of the results) and time complexity of algorithms with simulated data. In the practical application of NMF algorithms, stability plays an important role, which was an emphasis in the comparison. A Hierarchical clustering algorithm was implemented to evaluate the stability of NM…
Numerical simulation of fluid-structure interaction between acoustic and elastic waves
2011
CMaS spektrianalysoinnin automatisointi
2011
Viimeisien vuosikymmenien aikana maailman sähkönkulutus on noussut tasaisesti. Tähän kehitykseen eri sähköntuottamisen teollisuuden alat ovat joutuneet vastaamaan lisäämällä tuotantokapasiteettiaan. Uusiutuvista energiamuodoista tuulienergia on lisännyt tuotantokapasiteettiaan ehkä eniten. Koko kehityksensä ajan tuulienergian tuotantokapasiteetin lisääntyminen on ollut eksponentiaalista ja tämän kehityksen ennustetaan myös jatkuvan. Samaan aikaan kilpailu tuuliturbiinien osien valmistajien välillä kiristyy. Erittäin tärkeänä osana kilpailussa on tuotteen mukana myytävät palvelut. Tästä hyvä esimerkki on tuuliturbiinien vaihteiden valmistajan Moventaksen myymä kunnonvalvontajärjestelmä. Kyse…