2016, Vol. 18

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Now showing 1 - 5 of 29
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    Odstranění stimulačních hrotů ze signálu elektrokardiografu
    (International Society for Science and Engineering, o.s., 2016-12-31) Smíšek, Radovan; Plešinger, Filip; Jurák, Pavel; Halámek, Josef
    Ventricular dyssynchrony is a common cause of heart failure. Dyssynchrony can be eliminated using biventricular pacing. Analysis of ultra-high-frequency components in the band 500-2000 Hz allows to evaluate changes dyssynchrony due to stimulation and optimize the pacing parameters. The influence of pacing spikes is necessary to remove for this analysis. The influence of pacing spikes is in the analyzed frequency domain significantly higher than the influence of the electrical activity of the heart. The aim of this article is to present a new algorithm for removing pacing spikes, which enables the analysis of high frequency components in patients with biventricular pacemaker. A total of 8 different methods were tested on 46 records (15 minutes, 5 kHz, 24 bit). The paper discusses the properties of each method and indicates which of the proposed algorithms is best suited for the elimination of pacing artifacts.
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    Neuromuskulární systém člověka
    (International Society for Science and Engineering, o.s., 2016-08-31) Obšilová, Lucie; Havlíková, Marie; Bradáč, Zdeněk
    Human operator occurs in the most control systems called Man-Machine Systems (MMS). The quality of control depends on characteristics of human operator neuromuscular system, which contains efferent and afferent muscle fibers. Efferent muscle ensures the limb moving. Afferent muscle transmits information about limb moving to the central nervous system. This paper describes the physiology and the model of efferent and afferent muscle.
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    Modeling of the EEG signal
    (International Society for Science and Engineering, o.s., 2016-04-30) Svozilova, Veronika; Mezl, Martin
    This article describes important and wide academic Field, EEG signals modeling. A majordivision of this Field into two branches, EEG-like signals modeling and seizure-like signals modeling,is introduced and analyzed. Three models to generate EEG activity are represented including theirstructure, analytic description and parameters’ setting. Finally results of implemented models areintroduced, discussed and mutually compared with regard to expected EEG activity.
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    Tvarovanie 3R modelu ľudskej hlavy pomocou steroskopického snímania
    (International Society for Science and Engineering, o.s., 2016-02-29) Kovac, Ondrej; Mihalik, Jan
    In the paper techniques of 3D human head model shaping are described. The paper is mainly focused on mathematical description of parallel stereoscopic system and its implementation in estimation of human head coordinates issues. There are also analyzed issues of geometric camera calibration and homographic correction of stereoscopic camera system errors. Depth coordinates in general of arbitrary points of visual scene are result of estimation. In case of human head estimation these points correspond with facial definition points defined in MPEG-4/SNHC standard. The resulting coordinates after standardization into unitary space represent shaped 3D model. In conclusion achieved results are evaluated and possibility of using DMS approximation in process of 3D human head model surface smoothing is suggested too.
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    Jednoduchý odhad relatívnej permitivity steny pomocou UWB radarového systému
    (International Society for Science and Engineering, o.s., 2016-04-30) Repko, Miroslav; Gamec, Ján; Schneider, Ján
    This paper describes a simple method for the relative permittivity estimation of the wall by an ultra wideband (UWB) impulse radar system. I tis noninvasive reflected free space method, where the measuerent is employed from the single side of the wall. The condition for the best accuracy is short time window of the monitored signal, while there is an undesired reflection from the second side of the wall. Frequency dependence of the relative permittivity is then obtained from the reflection coefficien of the transmitted transverse electromagnetic wave. The paper describe demonstrative measurement at a two different walls, where acquired data are verificied by the transmission  method.