|
| |
|
|
Modulation signal source for microwave beacon
Belloň, Michal ; Vondra, Vlastimil (referee) ; Kasal, Miroslav (advisor)
This project is focused on construction of source of modulation signal for microwave beacon. The output signal is the same as signal, which is generated by PC software WSJT (Weak Signal by Joe Taylor) on PC sound card output. Signal on device output is modulated using by WSJT modulation and its specific JT4 mode. The device output has I and Q components of signal.
|
|
|
Properties of pulse wave velocity in human body during various excitations
Matejková, Magdaléna ; Halámek, Josef (referee) ; Vondra, Vlastimil (advisor)
The thesis is concerned with the analysis of measuring pulse wave velocity in human body with the aid of whole-body multichannel bioimpedance which was developed at ISI AS CR, v.v.i.. The evaluation of pulse wave velocity can provide us with important information about the state of vessel compliance which is one of the basic parameters informing on their physiological state. The examination of the state of vascular system is a very important part of early diagnostics because its pathological states are the main contributor to the rise of cardiovascular diseases and disease mortality. The thesis is concerned with the theoretical analysis together with the available methods of valuation of the state of vascular system that use measuring of pulse wave velocity. The main part of the thesis deals with the analysis of the whole-body multichannel bioimpedance measurement. The proposed and programmed protocol that summarizes and visualizes all obtained information is a part of this thesis. This is currently used as an output of the experimental measurement by this method. Data file for statistical processing contains the values of the pulse wave velocity of 35 healthy volunteers and subsequently the properties of pulse wave are assessed at various excitations.
|
|
|
Evaluation of cardiac output by bioimpedance method with patients with pacemaker
Soukup, Ladislav ; Cimbálník, Jan (referee) ; Vondra, Vlastimil (advisor)
This thesis deals with the possibility of using impedance cardiography for calculating cardiac output. Kubicek’s, Sramek‘s and Sramek-Bernstein‘s methods are discussed here. These methods were applied to a data set, obtained by measuring on subjects with implanted cardiostimulators. The subjects’ heart rate was being changed by the programing of cardiostimulators. Thanks to this procedure the measured data were not affected by artifacts, connected with the heart rate change caused by a body stress, or other influences. An influence of heart rate on a cardiac output value based on the statistical processing of the data set was studied.
|
|
|
Modelling of cardiac impedance signals
Matušek, Adam ; Vondra, Vlastimil (referee) ; Provazník, Ivo (advisor)
Tato diplomová práce se zabývá vytvořením modelu signálu impedančního měření srdce (ICG signál). Impedanční kardiografie podává informaci o změně srdečního objemu během srdečního cyklu. Modelování signálu předchází statistická analýza vzájemné pozice ICG signálu vzhledem k dalším mechanickým srdečním signálům. Konstrukce modelu vychází z reálných nasnímaných signálů. Konečný ICG model je začleněn do již existujícího modelu mechanických interakcí mezi srdcem a plícemi. Výsledkem je funkční model kardio-respiračních interakcí, který bude sloužit v dalších částech výzkumu laboratoře PRETA.
|
|
|
SMV-2015-32: Spirometer with analogue output
Vondra, Vlastimil
The system allows continuous measurement of the velocity of airflow in the airway during breathing maneuvers. Velocity measuring range is +/- 20 l / s. The velocity is converted into an analogue voltage for recording in the acquisition system. The device is powered by a rechargeable battery.
|
|
| |
|
|
SMV-2015-30: Visual metronome
Vondra, Vlastimil
Visual metronome enable us navigate the measured subjects during breathing maneuvers. It is possible to program up to 40 different respiratory rates and up to 8 waveforms. The instrument is powered by a rechargeable battery.
|
|
|
SMV-2012-22: Data processing in cardiology
Jurák, Pavel ; Halámek, Josef ; Vondra, Vlastimil
Contracted research has been focused on data processing in cardiology. It includes specialized analyzes of large polysomnographic records mainly from long-term sleep studies. Research involves advanced techniques for detection and analysis of heart rate, heart depolarization and repolarization and hemodynamic changes during different sleep stages. Detected numerical parameters were further processed and analyzes by different statistical methods
|
|
| |
guest ::
