Letteratura scientifica selezionata sul tema "Oscillations à Hautes Fréquences (HFO)"
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Tesi sul tema "Oscillations à Hautes Fréquences (HFO)"
Cimatti, Zoé. "Caractérisation des oscillations hautes fréquences en magnétoencéphalographie : application à la crampe de l'écrivain". Paris 6, 2007. http://www.theses.fr/2007PA066317.
Testo completoMilon-Harnois, Gaëlle. "Détection automatique et analyse des oscillations à haute fréquence en EEG-HD de surface". Electronic Thesis or Diss., Angers, 2023. http://www.theses.fr/2023ANGE0054.
Testo completoConditions of a third of epileptics are not improved with current treatments, pushing doctors to consider surgery to remove the brain area generating seizures. High Frequency Oscillations (HFO) are emerging as a biomarker to localize these epileptogenic zones, but their detection is difficult due to their rarity and brevity. In scalp EEG the low amplitude of the signal complicates the task. This thesis aims to automate the detection of HFO in EEG-HD signals recorded at 1 KHz on 256 electrodes in 5 pediatric patients. After visual marking of HFO, classification models between HFO and background noise were explored. Signal processing knowledge has been exploited to extract features from time or frequency domain. The most statistically relevant features were selected and submitted to classic supervised algorithms (Logistic regression, random forest, MLP, gradient boosting). These methods were compared to deep algorithms (CNN, LSTM, Attention) automatically generating signal characteristics in the 1D time domain or those of 2D time-frequency maps. All models show convincing results, with the deep 1D algorithms being more efficient reaching 91% sensitivity and 87% specificity, outperforming previously published surface HFO detectors. Running the best models on the entire signal to automatically detect HFO showed promising results but this part of the work remains to be improved to overcome the HFO rarity in the data. Several lines of research are suggested
Lazimi, David. "Détermination analytique de la réponse d'un propergol solide homogène à des oscillations de pression basses et hautes fréquences". Aix-Marseille 1, 1992. http://www.theses.fr/1992AIX11022.
Testo completoGerard, Mathias. "Étude des interactions pile/système en vue de l'optimisation d'un générateur pile à combustible : -interactions cœur de pile/compresseur- -interactions cœur de pile/convertisseur-". Phd thesis, Université de Franche-Comté, 2010. http://tel.archives-ouvertes.fr/tel-00618808.
Testo completoStaudacher, Joan. "Conservative numerical schemes for high-frequency wave propagation in heterogeneous media". Phd thesis, Ecole Centrale Paris, 2013. http://tel.archives-ouvertes.fr/tel-01005143.
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