12 research outputs found
Cardiac Pathologies Detection and Classification in 12-lead ECG
Background: Automatic detection and classification of cardiac abnormalities in ECG is one of the basic and often solved problems. The aim of this paper is to present a proposed algorithm for ECG classification into 19 classes. This algorithm was created within PhysioNet/CinC Challenge 2020, name of our team was HITTING. Methods: Our algorithm detects each pathology separately according to the extracted features and created rules. Signals from the 6 databases were used. Detector of QRS complexes, T-waves and P-waves including detection of their boundaries was designed. Then, the most common morphology of the QRS was found in each record. All these QRS were averaged. Features were extracted from the averaged QRS and from intervals between detected points. Appropriate features and rules were set using classification trees. Results: Our approach achieved a challenge validation score of 0.435, and full test score of 0.354, placing us 11 out of 41 in the official ranking. Conclusion: The advantage of our algorithm is easy interpretation. It is obvious according to which features algorithm decided and what thresholds were set
Portál pro klienty insolvenÄŤnĂch správcĹŻ
This thesis deals with processes and workflow within insolvency administrator's office, problematics of communication with their clients and sorting clients by their characteristics, considering changes in laws valid since 1. 1. 2014
Use of heart rate variability analysis for detection of sleep apnea
Article deals with usability of heart rate variability (HRV) for sleep apnea syndrome detection, using single lead electrocardiograph (ECG). This is alternative approach for apnea detection with possibility of time and price reduction of examination. First part of article summarises theory of sleep apnea and HRV. Second part deals with ECG signals from Physionet database, extracting features using HRV and statistical evaluation of their usability. Positive results of statistical testing are practically verified, using two classifiers.ÄŚlánek se zabĂ˝vá pouĹľitelnostĂ analĂ˝zy variability srdeÄŤnĂho rytmu (HRV) k detekci syndromu spánkovĂ© apnoe z jednokanálovĂ©ho elektrokardiografu (EKG). Jedná se o alternativnĂ pĹ™Ăstup k detekci apnoe, kterĂ˝ mĹŻĹľe sniĹľovat ÄŤasovou i finanÄŤnĂ nároÄŤnost vyšetĹ™enĂ. Ăšvodnà část se zabĂ˝vá spánkovĂ˝mi apnoemi a teoriĂ HRV. V praktickĂ© části se pracuje se signály EKG z databáze Physionet, pomocĂ analĂ˝zy HRV jsou zĂskány klasifikaÄŤnĂ pĹ™Ăznaky a jejich vhodnost je statisticky ověřena. PozitivnĂ vĂ˝sledek statistickĂ©ho testovánĂ je ověřen i prakticky, pomocĂ dvou klasifikátorĹŻ
ECG signal denoising via wavelet transform
ÄŚlánek se zabĂ˝vá problematikou filtrace elektrokardiogramĹŻ (EKG). PĹ™edevšĂm se zaměřuje na odstranÄ›nĂ rušivĂ˝ch myopotenciálĹŻ a to modernĂm pĹ™Ăstupem za pouĹľitĂ vlnkovĂ© transformace. Jsou zde rozebĂrány jednotlivĂ© metody vlnkovĂ© filtrace a diskutováno variabilnĂ nastavenĂ vstupnĂch parametrĹŻ. Algoritmy jsou testovány na signálech pocházejĂcĂch ze standardnĂ databáze CSE.ÄŚlánek se zabĂ˝vá problematikou filtrace elektrokardiogramĹŻ (EKG). PĹ™edevšĂm se zaměřuje na odstranÄ›nĂ rušivĂ˝ch myopotenciálĹŻ a to modernĂm pĹ™Ăstupem za pouĹľitĂ vlnkovĂ© transformace. Jsou zde rozebĂrány jednotlivĂ© metody vlnkovĂ© filtrace a diskutováno variabilnĂ nastavenĂ vstupnĂch parametrĹŻ. Algoritmy jsou testovány na signálech pocházejĂcĂch ze standardnĂ databáze CSE
Automatic detection of onsets of muscle activity to definition of driver’s muscle activity
Driver’s reaction time is the main characteristic of driver’s behavior in the real traffic. Reaction time might be separated into several components. One of these components, muscle response time, reflects about the nature and duration of the terminal phase of reaction time, i.e. releasing the accelerator pedal and depressing the brake pedal. To define muscle response time the accurate determining of muscle activity onset is needed. The aim of this article is to introduce two methods of automatic detection to determine the onset of muscle activity. Altogether, 13 drivers and three types of riding situations were tested during 40 minutes-long ride in the real traffic conditions. The obtained results of manual detection of muscle activity onset formed by expert and results obtained from automatic detections of muscle activity onset were compared and it was discussed which automatic detection method is appropriate to detect muscle activity onsets.ReakÄŤnĂ doba Ĺ™idiÄŤe je dĹŻleĹľitou charakteristikou chovánĂ Ĺ™idiÄŤe osobnĂho vozidla v běžnĂ©m dopravnĂm provozu. ReakÄŤnĂ dobu Ĺ™idiÄŤe lze dále separovat na nÄ›kolik sloĹľek, z nichĹľ doba svalovĂ© odezvy Ĺ™idiÄŤe pomÄ›rnÄ› pĹ™esnÄ› vypovĂdá o charakteru a dĂ©lce trvánĂ koneÄŤnĂ© fáze reakÄŤnĂ doby, tj. uvolnÄ›nĂ plynovĂ©ho a sešlápnutĂ brzdovĂ© pedálu. Ke stanovenĂ doby svalovĂ© odezvy Ĺ™idiÄŤe je nutnĂ© co nejpĹ™esnÄ›ji urÄŤit jejĂ počátek. CĂlem tohoto ÄŤlánku je pĹ™edstavit dvÄ› metody automatickĂ© detekce ke stanovenĂ počátkĹŻ svalovĂ© aktivity. Celkem bylo testováno 13 Ĺ™idiÄŤĹŻ bÄ›hem cca 40 minutovĂ˝ch jĂzd v reálnĂ©m mÄ›stskĂ©m provozu a 3 typy jĂzdnĂch situacĂ, na kterĂ© musel Ĺ™idiÄŤ osobnĂho vozidla bÄ›hem jĂzdy reagovat. ÄŚlánek diskutuje vĂ˝sledky dosaĹľenĂ© manuálnĂ detekcĂ počátkĹŻ svalovĂ© aktivity expertem a vĂ˝sledky dosaĹľenĂ© automatickou detekcĂ a ukazuje, zda jsou vybranĂ© a navrĹľenĂ© metody automatickĂ© detekce vhodnĂ© k vyuĹľitĂ doby svalovĂ© odezvy jako součásti celkovĂ© reakÄŤnĂ doby Ĺ™idiÄŤe osobnĂho vozidla