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Heart rate variability (HRV) analysis provides noninvasive way for assessment of neural activity that control cardiovascular system. Contributions of sympathetic and parasympathetic autonomous nervous system that modulate instantaneous heart rate are studied by means of spectral analysis. The objective is to recover modulating signal spectrum from beat occurrence times. In this paper, properties of...
Paper deals with complex solutions of radio communication systems for special application especially in air traffic control ATC and integrated rescue systems IRS area. Basic customer demands for such applications are briefly described and discussed from point of view of multi band antenna systems and SW transceivers. The architecture design of an ATC and an IRS system is demonstrated including remote...
This article is devoted to an investigation of electrophysical parameters of biological tissue influence on its absorption of microwave energy. The specific absorption rate (SAR) is the dosimetric quantity for evaluation of microwave energy absorbed in biological tissue. Many parameters have effect on the SAR value, such as geometry of the part of the body, which is exposed to microwave energy, electrical...
The influence of radio-frequency (RF) field orientation on specific absorption rate (SAR) in a human body is investigated in this paper. Three basic field orientations have been simulated: electric field vector, magnetic field vector and Poynting vector parallel to the longitudinal axis of a human body. The influence has been investigated in frequency range from 10 MHz to 2450 MHz with assistance...
This paper deals with problem of digital group delay equalizer for various types of digital filters. Proposed method of equalization is evaluated for a set of digital allpass filters. Whole system is analyzed in Matlab environment. Genetic algorithm has been used to design group delay equalizer. In this paper, the method of genetic algorithm is applied to group delay correction of digital IIR bandstop...
Optical coherence tomography (OCT) is a non-invasive interferometric imaging technique offering millimeter penetration depths of a sample with outstanding axial resolution. In this work a parallel Fourier domain optical coherence tomography (FD OCT) system is presented which records full tomograms of the sample structure in parallel. A fully parallel FD OCT system allows fast real time imaging of...
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