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    Wyświetlanie 1-5 z 5
    Tytuł:
    Fuzzy number division and the multi-granularity phenomenon
    Autorzy:
    Piegat, A.
    Pluciński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202398.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    granular computing
    fuzzy arithmetic
    fuzzy calculations
    RDM fuzzy arithmetic
    horizontal membership function
    przetwarzanie ziarniste
    arytmetyka liczb rozmytych
    RDM
    funkcja przynależności poziomej
    Opis:
    The paper presents difficulties connected with fuzzy and interval division. If operations such as fuzzy addition, subtraction and multiplication provide as a result one compact, multidimensional granule, then a result of the fuzzy division can consists of few separated granules. Such results are more difficult to use in next calculations. The paper shows that the number of solution granules can be higher than 2 and that in certain problems division does not occur explicitly. In certain problems, separation of particular solution granules can be considerable. The paper also shows how to realize the fuzzy division when its denominator contains zero. Most types of fuzzy arithmetics forbid such operation. However, the paper shows that it is possible. Multidimensional fuzzy RDM arithmetic and horizontal membership functions which facilitate detecting of solution granules are also described. The considered problems are visualized by examples.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 497-511
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interval arithmetic-based fuzzy discrete-time crane control scheme design
    Autorzy:
    Smoczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/201270.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    interval arithmetic
    discrete-time control
    fuzzy control
    pole placement
    anti-sway control
    Opis:
    In many manufacturing segments, container terminals and shipping yards the automation of material handling systems is an important element of enhancing productivity, safety and efficiency. The fast, precise and safe transfer of goods in crane operations requires a control application solving the problems, including non-collision trajectory planning and limitation of payload oscillations. The paper presents the interval arithmetic-based method of designing a discrete-time closed-loop anti-sway crane control system based on the fuzzy interpolation of linear controller parameters. The interval analysis of a closed-loop control system characteristic polynomial coefficients deviation from their nominal values is proposed to define a minimum number of fuzzy sets on the scheduling variables universe of discourse and to determine the distribution of triangular-shaped membership functions parameters, which satisfy the acceptable range of performances deterioration in the presence of the system’s parameters variation. The effectiveness of this method was proved in experiments conducted using the PAC system on the laboratory scaled overhead crane.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 863-870
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel architecture for floating point accumulator with cancelation error detection
    Autorzy:
    Jamro, E.
    Dąbrowska-Boruch, A.
    Russek, P.
    Wielgosz, M.
    Wiatr, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/201228.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    floating point arithmetic
    computing error
    approximate computing
    arytmetyka zmiennoprzecinkowa
    błąd obliczeniowy
    obliczenia przybliżone
    Opis:
    A floating point accumulator cannot be obtained straightforwardly due to its pipeline architecture and feedback loop. Therefore, an essential part of the proposed floating point accumulator is a critical accumulation loop which is limited to an integer adder and 16-bit shifter only. The proposed accumulator detects a catastrophic cancellation which occurs e.g. when two similar numbers are subtracted. Additionally, modules with reduced hardware resources for rough error evaluation are proposed. The proposed architecture does not comply with the IEEE-754 floating point standard but it guarantees that a correct result, with an arbitrarily defined number of significant bits, is obtained. The proposed calculation philosophy focuses on the desired result error rather than on calculation precision as such.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 579-587
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hardware implementation of hyperbolic tangent and sigmoid activation functions
    Autorzy:
    Hajduk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/200063.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FPGA
    hyperbolic tangent
    sigmoid
    floating point arithmetic
    tangens hiperboliczny
    arytmetyka zmiennoprzecinkowa
    funkcja sigmoidalna
    Opis:
    This paper presents the high accuracy hardware implementation of the hyperbolic tangent and sigmoid activation functions for artificial neural networks. A kind of a direct implementation of the functions in a few different versions is proposed and investigated both by software and hardware modeling. A single precision floating point arithmetic is applied. Apart from conventional design style with hardware description language coding, high level synthesis design techniques with the Matlab HDL coder and Xilinx Vivado HLS have also been investigated.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 563-577
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of transient heat transport in metal films using the interval lattice Boltzmann method
    Autorzy:
    Piasecka-Belkhayat, A.
    Korczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201473.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Boltzmann equation
    transport equation
    interval lattice Boltzmann method
    directed interval arithmetic
    równanie Boltzmanna
    równanie transportu
    interwałowa metoda siatek Boltzmanna
    Opis:
    In the paper a description of heat transfer in one-dimensional crystalline solids is presented. The lattice Boltzmann method based on Boltzmann transport equation is used to simulate the nanoscale heat transport in thin metal films. The coupled lattice Boltzmann equations for electrons and phonons are applied to analyze the heating process of thin metal films via laser pulse. Such approach in which the parameters appearing in the problem analyzed are treated as constant values is widely used, but in the paper the interval values of relaxation times and electron-phonon coupling factor are taken into account. The problem formulated has been solved by means of the interval lattice Boltzmann method using the rules of directed interval arithmetic. In the final part of the paper the results of numerical computations are shown.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 599-606
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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