2007/1

 

Recent Submissions

  • Neural Networks for Synthesis and Optimization of Antenna Arrays 

    Merad, Loo; Bendimerad, Fethi Tarik; Meriah, Sidi Mohamed; Djennas, Sidi Ahmed (Společnost pro radioelektronické inženýrství, 2007-04)
    This paper describes a usual application of back-propagation neural networks for synthesis and optimization of antenna array. The neural network is able to model and to optimize the antennas arrays, by acting on radioelectric ...

  • A New Defected Ground Structure for Different Microstrip Circuit Applications 

    Parui, Susanta Kumar; Das, Santanu (Společnost pro radioelektronické inženýrství, 2007-04)
    In this paper, a microstrip transmission line combined with a new U-headed dumb-bell defected ground structure (DGS) is investigated. The proposed DGS of two U-shape slots connected by a thin transverse slot is placed in ...

  • Animation of 3D Model of Human Head 

    Mihalik, Jan; Michalcin, Viktor (Společnost pro radioelektronické inženýrství, 2007-04)
    The paper deals with the new algorithm of animation of 3D model of the human head in combination with its global motion. The designed algorithm is very fast and with low calculation requirements, because it does not need ...

  • Transient Effects at Power-Supply System of the Czech Railways from EMC Viewpoint 

    Dolecek, Radovan; Hlava, Karel (Společnost pro radioelektronické inženýrství, 2007-04)
    The paper deals with the behavior of the traction power-supply system 25 kV, 50 Hz at the Czech Railways. Electrical conditions on a contact line affect electrical conditions in a feeding station. This relation represents ...

  • The Effects of MIMO Antenna System Parameters and Carrier Frequency on Active Control Suppression of EM Fields 

    Mohammed, Abbas; Hult, Tommy (Společnost pro radioelektronické inženýrství, 2007-04)
    In this paper we propose a new approach employing adaptive active control algorithms combined with a Multiple-Input Multiple-Output (MIMO) antenna system to suppress the electromagnetic field at a certain volume in space ...

  • Speech Defect Analysis Using Hidden Markov Models 

    Chaloupka, Zdenek; Uhlir, Jan (Společnost pro radioelektronické inženýrství, 2007-04)
    The main aim of this paper is the analysis of speech deteriorated by a very rare disease, which induce epileptic seizures in a part of brain responsible for speech production. Speech defects, represented mostly by the ...

  • Face Recognition Methods Based on Feedforward Neural Networks, Principal Component Analysis and Self-Organizing Map 

    Oravec, Milos; Pavlovicova, Jarmila (Společnost pro radioelektronické inženýrství, 2007-04)
    In this contribution, human face as biometric is considered. Original method of feature extraction from image data is introduced using MLP (multilayer perceptron) and PCA (principal component analysis). This method is used ...

  • Measurement of Electromagnetic Activity of Yeast Cells at 42 GHz 

    Jelinek, Frantisek; Saroch, Jaroslav; Kucera, Ondrej; Hasek, Jiri; Pokorny, Jiri; Jaffrezic-Renault, Nicole; Ponsonnet, Laurence (Společnost pro radioelektronické inženýrství, 2007-04)
    This paper discusses the possibility of using a device composed of a resonant cavity, preamplifiers, and a spectrum analyzer to detect electromagnetic emission of yeast cells at a frequency of about 42 GHz. Measurement in ...

  • Practice Utilization of Algorithms for Analog Filter Group Delay Optimization 

    Zaplatilek, Karel; Ziska, Premysl; Hajek, Karel (Společnost pro radioelektronické inženýrství, 2007-04)
    This contribution deals with an application of three different algorithms which optimize a group delay of analog filters. One of them is a part of the professional circuit simulator Micro Cap 7 and the others two original ...

  • Implementations of HVS Models in Digital Image Watermarking 

    Foris, Peter; Levicky, Dusan (Společnost pro radioelektronické inženýrství, 2007-04)
    In the paper two possible implementations of Human Visual System (HVS) models in digital watermarking of still images are presented. The first method performs watermark embedding in transform domain of Discrete Cosine ...

  • Modeling Delays of Microwave Transistors and Transmission Lines by the 2nd Order Bessel Function 

    Dobes, Josef; Ulovec, Karel (Společnost pro radioelektronické inženýrství, 2007-04)
    At present, most of simulation programs can characterize gate delays of microwave transistors. However, the delay is mostly approximated by means of first-order differential equations. In the paper, a more accurate way is ...