2007/2

 

Recent Submissions

  • Optimization of Transient Response Radiation of Printed Ultra Wideband Dipole Antennas (Using Particle Swarm Optimization Method) 

    Cerny, Petr; Mazanek, Milos (Společnost pro radioelektronické inženýrství, 2007-06)
    In case of particular ultra wideband applications (i.e. radar, positioning, etc.), it is crucial to know the transient responses of antennas. In the first part of the paper, the optimization process searches for the dipole ...

  • Automatic Speech Segmentation Based on HMM 

    Kroul, Martin (Společnost pro radioelektronické inženýrství, 2007-06)
    This contribution deals with the problem of automatic phoneme segmentation using HMMs. Automatization of speech segmentation task is important for applications, where large amount of data is needed to process, so manual ...

  • Segmentation Based Image Scanning 

    Pracko, Richard; Polec, Jaroslav; Hasenohrlova, Katarina (Společnost pro radioelektronické inženýrství, 2007-06)
    The submitted paper deals with separate scanning of individual image segments. A new image processing approach based on image segmentation and segment scanning is presented. The resulting individual segments 1-dimensional ...

  • Phase Change Materials for Thermal Management of IC Packages 

    Behunek, Ivo; Fiala, Pavel (Společnost pro radioelektronické inženýrství, 2007-06)
    This paper deals with the application of phase change materials (PCM) for thermal management of integrated circuits as a viable alternative to active forced convection cooling systems. The paper presents an analytical ...

  • Analytical Modeling of Insulated Dipole Applicators for Interstitial Hyperthermia: a Review 

    Sagnard, Florence (Společnost pro radioelektronické inženýrství, 2007-06)
    Microwave hyperthermia appears as an adjuvant technique to heat relatively small tumors in a minimally invasive way. As this technique is based on interstitial antennas, we propose a review of the physical phenomena involved ...

  • Spontaneous Ultra-Weak Photon Emission from Human Hands Is Time Dependent 

    Cifra, Michal; Van Wijk, Eduard; Koch, Heike; Bosman, Saskia; Van Wijk, Roeland (Společnost pro radioelektronické inženýrství, 2007-06)
    Ultra-weak photon emission in the visible range was measured on palm and dorsal side of left and right hand by means of a low noise photomultiplier system. To study the dynamics of this photon emission in a 24 h period ...

  • Switched-Capacitor Filter Optimization with Respect to Switch On-State Resistance and Features of Real Operational Amplifiers 

    Dolivka, Lukas; Hospodka, Jiri (Společnost pro radioelektronické inženýrství, 2007-06)
    The optimization of a switched-capacitor filter, which implements a biquadratic section, is described in this paper. The aim of the optimization is to obtain a required magnitude frequency response of the filter. The ...

  • A Three-Level Hierarchical Encoder Using Shape Independent Transform 

    Mojzez, Martin; Polec, Jaroslav (Společnost pro radioelektronické inženýrství, 2007-06)
    In this paper a scheme for utilizing shape independent basis functions for a hierarchical multiresolution image compression is shown. First, an image is segmented and its segments\' boundaries are polygon approximated, ...

  • Total Differential Errors in One-Port Network Analyzer Measurements with Application to Antenna Impedance 

    Yannopoulou, Nikolitsa; Zimourtopoulos, Petros (Společnost pro radioelektronické inženýrství, 2007-06)
    The objective was to study uncertainty in antenna input impedance resulting from full one-port Vector Network Analyzer (VNA) measurements. The VNA process equation in the reflection coefficient ρ of a load, its measurement ...

  • DRM Transmitter with FPGA Device 

    Dobias, Pavel (Společnost pro radioelektronické inženýrství, 2007-06)
    This paper presents the design and analysis of the OFDM modulator for Digital Radio Mondiale (DRM) standard. Attention is paid to the digital signal processing in FPGA devices. The system performs carrier modulation of the ...

  • Multibeam Antennas Array Pattern Synthesis Using a Variational Method 

    Guenad, Boumediene; Meriah, Sidi Mohamed; Bendimerad, Fethi Tarik (Společnost pro radioelektronické inženýrství, 2007-06)
    In this paper a new method is described for multibeam antennas synthesis where both the amplitude and phase of each radiating element is a design variable. The developed optimization method made possible to solve the ...

  • A New 3-D Piecewise-Linear System for Chaos Generation 

    Elhadj, Zeraoulia (Společnost pro radioelektronické inženýrství, 2007-06)
    We propose in this paper a new simple continuous-time piecewise-linear three dimensional system for chaos generation. Nonlinearity in this model is introduced by the characteristic function of the Chua\'s circuit given in ...

  • Automatic Classifiers for Medical Data from Doppler Unit 

    Malek, Jiri; Nouza, Jan; Klimovic, Tomas (Společnost pro radioelektronické inženýrství, 2007-06)
    Nowadays, hand-held ultrasonic Doppler units are often used for noninvasive screening of atherosclerosis in arteries of the lower limbs. The mean velocity of blood flow in time and blood pressures are measured on several ...