7 research outputs found
Deep comparisons of Neural Networks from the EEGNet family
Most of the Brain-Computer Interface (BCI) publications, which propose
artificial neural networks for Motor Imagery (MI) Electroencephalography (EEG)
signal classification, are presented using one of the BCI Competition datasets.
However, these databases contain MI EEG data from less than or equal to 10
subjects . In addition, these algorithms usually include only bandpass
filtering to reduce noise and increase signal quality. In this article, we
compared 5 well-known neural networks (Shallow ConvNet, Deep ConvNet, EEGNet,
EEGNet Fusion, MI-EEGNet) using open-access databases with many subjects next
to the BCI Competition 4 2a dataset to acquire statistically significant
results. We removed artifacts from the EEG using the FASTER algorithm as a
signal processing step. Moreover, we investigated whether transfer learning can
further improve the classification results on artifact filtered data. We aimed
to rank the neural networks; therefore, next to the classification accuracy, we
introduced two additional metrics: the accuracy improvement from chance level
and the effect of transfer learning. The former can be used with different
class-numbered databases, while the latter can highlight neural networks with
sufficient generalization abilities. Our metrics showed that the researchers
should not avoid Shallow ConvNet and Deep ConvNet because they can perform
better than the later published ones from the EEGNet family
Kalauz az emberbaráti oktatás és nevelés terén 10 (1896) 01-02
Kalauz 10. Ă©vfolyam, 1-2. szám Budapest, 1896. oktĂłber-november. A testi Ă©s szellemi fogyatkozásban szenvedĹ‘ket gyámolĂtĂł országos egyesĂĽlet hivatalos közlönye. A folyĂłirat 1887-1896 között "Kalauz a siketnĂ©mák oktatása Ă©s nevelĂ©se terĂ©n” cĂmen jelent meg
SzĂ©n nanocsĹ‘ jellegű nanoszerkezetek előállĂtása, mĂłdosĂtása Ă©s jellemzĂ©se fizikai, kĂ©miai Ă©s szimuláciĂłs mĂłdszerekre alapozva = Production, modification and characterization by physical, chemical and computer simulation of carbon nanotube type nanostructures
Kimutattuk, hogy a nem-hatszöges (n-H) gyűrűket is tartalmazĂł szĂ©n nanoszerkezetek (Y-elágazás, hengerspirálok, stb.) növekedĂ©sĂ©t az n-H gyűrűk beĂ©pĂĽlĂ©sĂ©nek mikĂ©ntje határozza meg, Ăşj modellt javasoltunk hengerspirálok szerkezetĂ©re. ElsĹ‘kĂ©nt kĂ©szĂtettĂĽnk Si3N4/szĂ©n nanocsĹ‘ kompozitokat Ă©s megmutattuk, hogy megfelelĹ‘ szinterelĂ©si paramĂ©terek alkalmazásával megĹ‘rizhetĹ‘k az elektromosan vezetĹ‘vĂ© tett mátrix jĂł tulajdonságai. Ăšj nanocsĹ‘ növesztĂ©si mĂłdszereket dolgoztunk ki. ElsĹ‘kĂ©nt bizonyĂtottuk, hogy az ionos besugárzás nyomán a szĂ©n nanocsöveken, valĂłban a szimuláciĂłknak megfelelĹ‘ topográfiai alakzatok jelennek meg. ElmĂ©leti modellt adtunk a hibák környezetĂ©ben azt STM felvĂ©teleken megfigyelhetĹ‘ szuperstruktĂşrák eredetĂ©re. Megmutattuk, hogy a funkcionalizálás mĂłdjátĂłl fĂĽggĹ‘en a funkciĂłs csoportok szigetszerűen, vagy folytonoshelyezkednek el. A funkciĂłs csoportok megváltoztatják a nanocsövek válaszjelĂ©t a környezetben jelenlĂ©vĹ‘ gázokra/gĹ‘zökre. Sikeresen fejlesztettĂĽnk elmĂ©leti mĂłdszereket a gyengĂ©n kölcsönhatĂł nagy atomszámĂş rendszerek leĂrására Ă©s elsĹ‘kkĂ©nt vizsgáltuk sok szĂ©n nanocsöbĹ‘l felĂ©pĂĽlĹ‘ kötegekben a csövek egymással valĂł kölcsönhatását. ElsĹ‘ elvekre illetve sűrűsĂ©gfunkcionál mĂłdszerre alapozva vizsgáltuk a duplafalĂş szĂ©n nanocsövek, illetve a nanocsĹ‘ben elhelyezkedĹ‘ szĂ©nláncok tulajdonságait. A sajátfejlesztĂ©sű hullámcsomagdinamikai mĂłdszerĂĽnkkel elsĹ‘kkĂ©nt vizsgáltuk az elektronhullámok terjedĂ©sĂ©t szĂ©n nanocsĹ‘ Y elágazásokban. | We showed that the growth of carbon nanostructures containing non-hexagonal (n-H) rings (Y-branches, coils etc.) is determined by the incorporation of the n-H rings, we proposed a new model for the structure of regularly coiled carbon nanotubes. We prepared the first Si3N4/carbon nanotube composites and we showed the under proper sintering conditions the composite can be made conductive while keeping the remarkable properties of the matrix. We developed new growth methods for carbon nanotubes. We showed for the first time that ion irradiation of carbon nanotubes indeed creates the features predicted by simulations. We proposed a theoretical description of the superstructures observed in STM in the vicinity of the defects. Depending on the way in which the functionalization is done, the functional groups appear on the nanotubes in an island-like or a continuous fashion. Their presence influences the response of the carbon nanotubes to the gases/vapors present in the atmosphere. We developed successfully theoretical tools for the description of weakly interacting large system and investigated for the first time the interaction of tubes in carbon nanotube bundles containing many tubes. Based on first principle and density functional calculations we investigated the double wall carbon nanotubes and linear carbon chains located inside a SWCNT. Using our own wave packet dynamical software we investigated the propagation of electronic waves in carbon nanotube Y junctions