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Wyszukujesz frazę "Szczepański, M." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analysis of positioning error and its impact on high frequency properties of differential signal coupler
    Autorzy:
    Zmuda, M.
    Szczepański, S.
    Kozieł, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/200709.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high speed data transmission monitoring
    coupler positioning accuracy
    manufacturing of coupling structures
    monitoring wysokiej prędkości transmisji danych
    dokładność pozycjonowania
    produkcja konstrukcji sprzęgła
    Opis:
    This paper presents the analysis of the effect of differential signal coupler positioning accuracy on its high frequency performance parameters for contact-less high speed chip-to-chip data transmission on PCB application. Our considerations are continuation of the previous works on differential signal coupler concept, design methodology and analysis for high speed data transmission monitoring. The theoretical analysis of possible coupler positioning innaccuracies is extended for representative design cases by simulations carried out using EM simulator. The results reported here confirm that the concept of contactless monitoring of high speed chip-to-chip data transmission in a pair of coupled microstrip lines is of practically usefulness without applying the expensive and precise positioning system.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 549-553
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The contact-less method of chip-to-chip high speed data transmission monitoring
    Autorzy:
    Zmuda, M.
    Szczepański, S.
    Kozieł, S.
    Graczyk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/202115.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high speed data transmission monitoring
    microstrip coupler
    connector-less transmission monitoring
    time-domain measurement
    Opis:
    This paper presents a technique of decoupling differential signals transmitted in a pair of microstrip lines on a printed circuit board (PCB), using dedicated coupler for high speed data transmission monitoring in chip-to-chip interconnections. The coupler used for signal probing is overlayed on the pair of microstrip lines under test, and provides a signal to the next blocks of the measurement system without disturbing transmission in the lines. Starting from the basic configuration obtained in the previous work, we describe a procedure of re-designing the coupler for enhanced directivity so that it is suitable for high-speed data transmission monitoring. The new coupler structure has improved topology based on stepped-impedance resonators with geometry parameters adjusted using numerical optimization techniques. The correctness of the design has been confirmed by the time-domain measurements performed for real chip-to-chip communication signals, using a dedicated measurement system based on Xilinx Virtex-6 FPGA Development Kit. The presented technology can be used for reducing the cost of the product diagnostics by eliminating dedicated measurement connectors, run-time system debugging or reverse engineering.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 61-68
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FPGA and ASIC implementation of the algorithm for traffic monitoring in urban areas
    Autorzy:
    Szczepański, S.
    Wójcikowski, M.
    Pankiewicz, B.
    Kłosowski, M.
    Żaglewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/202318.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FPGA
    ASIC
    sensor network
    Opis:
    This paper describes the idea and the implementation of the image detection algorithm, that can be used in integrated sensor networks for environment and traffic monitoring in urban areas. The algorithm is dedicated to the extraction of moving vehicles from real-time camera images for the evaluation of traffic parameters, such as the number of vehicles, their direction of movement and their approximate speed. The authors, apart from the careful selection of particular steps of the algorithm towards hardware implementation, also proposed novel improvements, resulting in increasing the robustness and the efficiency. A single, stationary, monochrome camera is used, simple shadow and highlight elimination is performed. The occlusions are not taken into account, due to placing the camera at a location high above the road. The algorithm is designed and implemented in pipelined hardware, therefore high frame-rate efficiency has been achieved. The algorithm has been implemented and tested in FPGA and ASIC.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 137-140
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PMSM drive with adaptive state feedback speed controller
    Autorzy:
    Szczepanski, R.
    Tarczewski, T.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200540.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adaptive control
    state feedback controller
    PMSM
    Widrow-Hoff rule
    Opis:
    In this paper, the issue related to control of the plant with nonconstant parameters is addressed. In order to assure the unchanged response of the system, an adaptive state feedback speed controller for permanent magnet synchronous motor is proposed. The model-reference adaptive system is applied while the Widrow-Hoff rule is used as adjustment mechanism of controller’s coefficients. Necessary modifications related to construction of the cost function and formulas responsible for adjustment of state feedback speed controller’s coefficients are depicted. The impact of adaptation gain, which is the only parameter in proposed adjustment mechanism, on system behaviour is experimentally examined. The discussion about computational resources consumption of the proposed adaptation algorithm and implementation issues is included. The proposed approach is utilized in numerous experimental tests on modern SiC based drive with nonconstant moment of inertia. Comparison between adaptive and nonadaptive control schemes is also shown.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1009-1017
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power equalization of AES FPGA implementation
    Autorzy:
    Strachacki, M.
    Szczepański, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/199907.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AES
    FPGA
    cryptography
    side channel attack
    DPA
    power analysis
    power equalization
    Opis:
    This paper briefly introduces side channel attacks on cryptographic hardware with special emphasis on differential power analysis (DPA). Based on existing countermeasures against DPA, design method combining power equalization for synchronous and combinatorial circuits has been proposed. AES algorithm has been implemented in Xilinx Spartan II-E field programmable gate array (FPGA) device using the standard and power-equalized methods. Power traces for DPA have been collected using XPower tool. Simulation results show that standard AES implementation can be broken after N=500 encryptions, while power-equalized counterpart shows no correlation between power consumption and the cipher key after N=2000 encryptions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 125-128
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photonic integrated circuits - a new approach to laser technology
    Autorzy:
    Piramidowicz, R.
    Stopiński, S.
    Ławniczuk, K.
    Welikow, K.
    Szczepański, P.
    Leijtens, X.
    Smit, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201657.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    integrated optoelectronics
    laser technology
    photonic integrated circuits
    indium phosphide
    Opis:
    In this work a brief review on photonic integrated circuits (PICs) is presented with a specific focus on integrated lasers and amplifiers. The work presents the history of development of the integration technology in photonics and its comparison to microelectronics. The major part of the review is focused on InP-based photonic integrated circuits, with a short description of the potential of the silicon technology. A completely new way of fabrication of PICs, called generic integration technology, is presented and discussed. The basic assumption of this approach is the very same as in the case of electronic circuits and states that a limited set of standard components, both active and passive, enables designing of a complex, multifunctional PIC of every type. As a result, functionally advanced, compact, energy efficient and cost-optimized photonic devices can be fabricated. The work presents also selected examples of active PICs like multiwavelength laser sources, discretely tunable lasers, WDM transmitters, ring lasers etc.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 683-689
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bulk linearized CMOS differential pair transconductor for continuous-time OTA-C filter design
    Autorzy:
    Pankiewicz, B.
    Szczepański, S.
    Wójcikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201044.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transconductance amplifier
    OTA
    bulk-driven amplifier
    OTA-C filter
    Opis:
    In this paper, the MOS differential pair driven simultaneously from gates and bulk terminals is described. An approximated analytical solution of the voltage to current transfer function has been found for the proposed circuit. Four possible combinations of gate and bulk connections of the input signal are presented. Basing on the configuration giving the best linearity, the operational transconductance amplifier (OTA) has been designed and compared, by computer simulations, to the amplifier utilizing the gate driven classic MOS pair. 3rd order filters using the OTAs with linearized and simple MOS pair have been designed and the resulting parameters have been compared. Linearization through the presented simultaneous use of gate and bulk terminals seems to be useful for low voltage applications.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 77-84
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Road vehicle sequencing problem in a railroad intermodal terminal – simulation research
    Autorzy:
    Jacyna, M.
    Jachimowski, R.
    Szczepański, E.
    Izdebski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200619.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    intermodal terminal
    road vehicle sequencing
    FlexSim simulation
    modelling
    Opis:
    The paper presents the issue of container handling processes at a railroad intermodal terminal. The main purpose of this paper is the assessment of the handling equipment utilization and the associated energy consumption. The authors analyze how the road vehicle availability at the moment specified in the containers loading schedule influences the total handling equipment operation time as well as the necessary number of handling equipment. It is assumed that vehicles planned for loading of import containers may be late for loading, which causes some interruptions in the loading schedule. Such interruptions are identified with the necessity to handle the next container for which the road vehicle is already waiting, which influences the handling equipment utilization and, finally, energy consumption. The general mathematical model of the problem developed in the FlexSim simulation software was presented. Based on the simulation research, it pointed out that proper road vehicles loading sequencing can significantly reduce handling equipment operation time, and thus energy consumption, costs, and CO2 emissions. The literature analysis presented in the paper indicates that most of the research in the field of intermodal transport is focused on operations optimization in container ports. There are differences between two types of intermodal terminals in operation procedures and rules. That is why the authors decided to undertake the problem of road vehicle sequencing including their random availability and its influence on handling device operation time, which has not been considered in the literature so far.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1135-1148
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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