Articole științifice/Scientific articles: Recent submissions

  • A highly scalable video coding technique based on the Wavelet Transform [articol] 
    Vizireanu, Dragoș N.; Preda, Radu O.; Udrea, Radu Mihnea (Timişoara : Editura Politehnica, 2004)
    We want to create a video codec, that can compress a video stream at a single bitrate and decompress it at different bitrates. Our implementation of the codec uses wavelets as its base. The encoder reads the uncompressed ...
  • DC-DC converter in which the duty factor is controlled by the capacitor voltage [articol] 
    Ursaru, Ovidiu; Ţigăeru, Liviu; Aghion, Cristian (Timişoara : Editura Politehnica, 2004)
    The d.c.-d.c. converters, which assure the conversion from d.c.-d.c., have both at the input and at the output, different values for the voltages and the continuous currents. In most cases, the output voltages must remain ...
  • Fingerprint recognition using Gabor filters and Wavelet features [articol] 
    Tudosă, Ana Maria; Costin, Mihaela; Barbu, Tudor (Timişoara : Editura Politehnica, 2004)
    Amongst the several approaches on fingerprint matching, the most popular continues to be minutiae based. But this technique does not use much of the discriminatory information available in the fingerprints, because local ...
  • On delta modulation control of three-phase asynchronous motors [articol] 
    Trip, Nistor-Daniel; Popescu, Viorel, 1947; Şchiop, Adrian Lazăr (Timişoara : Editura Politehnica, 2004)
    This work presents some considerations on a control method for a three-phase asynchronous motor. This control method uses the delta modulation principle to generate the command signals for a full bridge power inverter that ...
  • Resonant inverter modeling for induction heating [articol] 
    Tomşe, Marin V.; Popescu, Viorel; Paşca, Sorin (Timişoara : Editura Politehnica, 2004)
    Dynamic analysis of the phase-shift controlled series-resonant inverter for induction heating is presented using harmonic approximation modeling. First, the large-signal state-space model is derived and steady-state solution ...
  • Space and frequency analyze of an LSI optical system with different input signals [articol] 
    Toadere, Florin (Timişoara : Editura Politehnica, 2004)
    Our goal in this paper is to develop a calculus algorithm beginning from Optical Fourier Transform and then to generalize to optical linear shift invariant systems. We begin from the premise that an optical system can be ...
  • Cartesian coordinate optical filter analyses [articol] 
    Toadere, Florin (Timişoara : Editura Politehnica, 2004)
    Our goal in this paper is to develop a study about how Cartesian coordinate optical filter acts in frequency. We use coherent illumination and we begin from the amplitude transfer function which is the optical transfer ...
  • A physical laboratory for smart transducers education [articol] 
    Tiponuţ, Virgil (Timişoara : Editura Politehnica, 2004)
    In this paper, the development of a physical laboratory for practical activities in the field of smart transducers is presented. The themes of the laboratory works are close related to the curricula of the Smart Transducers ...
  • A toolkit for internet based distance laboratory development [articol] 
    Tiponuţ, Sebastian V. (Timişoara : Editura Politehnica, 2004)
    This paper describes the design and implementation of a distance laboratory, suitable to be used in a large range of experiments with proper customization. Using the well-known client-server paradigm, this design tries to ...
  • Low power current mode analog architecture for fuzzy logic systems [articol] 
    Ţigăeru, Liviu; Ursaru, Ovidiu (Timişoara : Editura Politehnica, 2004)
    The present paper proposes a highly programmable current mode architecture for a low power implementation of a fuzzy logic system. The solution eliminates the aggregation of the individual contributions of the fuzzy rules ...
  • A discrete model for reference source noise in indirect frequency synthesis [articol] 
    Teodoru, Emil; Demeter, Ştefan (Timişoara : Editura Politehnica, 2004)
    Indirect frequency synthesis preserves its actuality and is still offering good possibilities to achieve performing systems. Practical problems refer to obtaining competitive acquisition times, under an intense traffic and ...
  • A very efficient and accurate pitch detection method [articol] 
    Teodorescu, T. D.; Chiper, Doru Florin (Timişoara : Editura Politehnica, 2004)
    In the last 15 years, due to the expansion of the mobile telephony, but not only, efficient, low cost and low power compression methods for speech signals have been developed. At this moment, many standards for vocoders ...
  • Simulations of impulse response for diffuse indoor wireless channels [articol] 
    Telescu, Mihai; Ghişa, Laura; Besnard, Pascal; Mihăescu, Adrian (Timişoara : Editura Politehnica, 2004)
    Calculating channel impulse response is important in all forms of communications. In the case of diffuse infrared wireless networks channel response varies abruptly with changes in receiver/emitter position so the development ...
  • Adaptive filtering algorithms [articol] 
    Szopos, Erwin; Toma, Norbert; Ţopa, Marina (Timişoara : Editura Politehnica, 2004)
    The paper presents some efficient algorithms for adaptive filtering: Wiener filter, Least Mean Square (LMS) algorithm, Kalman algorithm. These are used in several applications such as: echo canceller on telephone lines, ...
  • PC-based system for automated calibration of a digital voltmeter [articol] 
    Stoiciu, Dan; Lascu, Mihaela Ruxandra (Timişoara : Editura Politehnica, 2004)
    The paper presents a system built around a PC and the application in LabVIEW for automated calibration of a digital voltmeter against a high accuracy voltmeter. The devices communicate within the system through standard ...
  • Considerations about the design requirements for analog anti-aliasing filters [articol] 
    Stoica, Adrian; Vizitiu, Constantin Iulian; Nicolaescu, Ioan; Anton, Lucian (Timişoara : Editura Politehnica, 2004)
    This is an overview on theoretical aspects of anti-aliasing filters, which are used together with high speed sampling Analog to Digital Converters (ADCs) in many applications. The main purpose is to define and to identify ...
  • Application of turbo principle to product codes [articol] 
    Stoian, Rodica; Perişoară, Lucian Andrei (Timişoara : Editura Politehnica, 2004)
    In this paper we introduce the iterative decoding principle, “the turbo principle”, for the bidimensional Turbo Product Codes (TPC’s). The constituent codes used for encoding on rows and columns are two concatenated (7,4) ...
  • Reconstruction methods for missing portions in signals [articol] 
    Stanciu, Lucian; Banu, Leonard (Timişoara : Editura Politehnica, 2004)
    On the storage medium the information can be lost from a portion of a signal. The missing or disturbed portion of the audio signal is replaced by a weighting average of the forward and backward extrapolated signals. A new ...
  • Polarization method for electrical current measurement [articol] 
    Simion, Viorica; Pantelimon, Brânduşa; Ştefănescu, Costin (Timişoara : Editura Politehnica, 2004)
    This paper presents a polarization method for electrical current measurement using optical fiber. Classical polarization method has the advantage of being simple but for getting a good performance the optical components ...
  • MEMS based broadband phase shifters [articol] 
    Simion, Ștefan (Timişoara : Editura Politehnica, 2004)
    A phase shifter based on an array of MEMS is designed and then analyzed by computer simulation. It is shown that for a stable bridge position, the maximum ratio of the equivalent capacitance cannot exceed 1.2. For a microwave ...

Search DSpace


Advanced Search

Browse

My Account