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    Wyświetlanie 1-14 z 14
    Tytuł:
    New Approach to the Uncertainty Assessment of Acoustic Effects in the Environment
    Autorzy:
    Batko, W.
    Pawlik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/177204.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    interval arithmetic
    uncertainty
    railway noise
    Opis:
    The acoustic climate assessment needed for the selection of solutions (technical, legal and organisa- tional), which will help to minimise the acoustic hazards in the analysed areas, is realised on the basis of acoustic maps. The reference computational algorithms, assigned to them, require very thorough prepa- ration of input data for the considered noise source model representing – in the best possible way – the acoustic climate. These input data are burdened with certain uncertainties in this class of computational tasks. The uncertainties are related to the problem of selecting proper argument values (from the inter- val of their possible variability) for the modelled processes. This situation has a direct influence on the uncertainty of acoustic maps. The idea of applying the interval arithmetic for the assessment of acoustic models uncertainty is formulated in this paper. The computational formalism assigned to the interval arithmetic was discussed. The rules of interval estimations for the model solutions determining the sound level distribution around the analysed noise source – caused by possible errors in the input data – were presented. The application of this formalism was illustrated in uncertainty assessments of modelling acoustic influences of the railway noise linear source on the environment.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 57-61
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified Distributed Arithmetic Concept for Implementations Targeted at Heterogeneous FPGAs
    Autorzy:
    Rawski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226835.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed arithmetic
    FPGA
    heterogeneous programmable structures
    Opis:
    Distributed Arithmetic (DA) plays an important role in designing digital signal processing modules for FPGA architectures. It allows replacing multiply-and-accumulate (MAC) operations with combinational blocks. The quality of implementations based on DA strongly depends on efficiency of methods that map combinational DA block into FPGA resources. Since modern FPGAs have heterogeneous structure, there is a need for quality algorithms to target these structures and the need for flexible architecture exploration aiding in appropriate mapping. The paper presents a modification of DA concept that allows for very efficient implementation in heterogeneous FPGA architectures.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 4; 345-350
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Performance DIF-FFT Using Dissimilar Partitioned LUT Based Distributed Arithmetic
    Autorzy:
    Cheepurupalli, Kusma Kumari
    Charan, Muntha
    Rao, Jammu Bhaskara
    Noor, Mahammad S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055270.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fast Fourier transform
    adders
    distributed arithmetic
    DSP
    Opis:
    Real-time data processing systems utilize Digital Signal Processing (DSP) functions as the base modules. Most of the DSP functions involve the implementation of Fast Fourier Transform (FFT) to convert the signals from one domain to another domain. The major bottleneck of Decimation in frequency - Fast Fourier Transform (DIF-FFT) implementation lies in using a number of Multipliers. Distributed arithmetic (DA) is considered as one of the efficient techniques to implement DIF-FFT. In this approach, the multipliers are not used. The proposed technique exploits the very advantage of the look-up table by storing the Twiddle factors, thereby avoiding the multipliers required in the butterfly structure. DIF-FFT using Distributed Arithmetic (DIF-FFT DA) models, with different adders such as Ripple carry adder (RCA), Carry-lookahead adder (CLA), and Sklansky prefix graph adder, are proposed in this paper. The three proposed models are synthesized using Cadence 6.1 EDA tools with a 45nm CMOS technology. Compared to the traditional method, it is observed that the area is improved by 53.11%, 53.35%, and 50.15%, power is improved by 42.31%, 42.52%, and 40.39%, and delay is improved by 45.26%, 45.42%, 41.80%, respectively.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 631--637
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of transmultiplexer integer filters
    Autorzy:
    Ziółko, M.
    Nowak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/229408.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fixed point arithmetic
    MIMO systems
    integer digital filters
    Opis:
    The designing of transmultiplexer systems relies on determining filters for the transmitter and receiver sides of multicarrier communication system. The perfect reconstruction conditions lead to the bilinear equations for FIR filter coefficients. Generally there is no way of finding all possible solutions. This paper describes methods of finding a large family of solutions. Particular attention is devoted to obtaining algorithms useful in fixed-point arithmetic needed to design the integer filters. As a result, the systems perform perfect reconstruction of signals. Additionally, a simple method is presented to transform any transmultiplexer into an unlimited number of different transmultiplexers. Finally, two examples of integer filters that meet perfect reconstruction conditions are shown. The first illustrates a FIR filter which does not require multiplications. The frequency properties of filters and signals are discussed for the second example.
    Źródło:
    Archives of Control Sciences; 2018, 28, 2; 223-238
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the Arithmetic Decomposition of DA-LUT Block for Heterogeneous FPGA Structures
    Autorzy:
    Staworko, M.
    Rawski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226414.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed arithmetic
    FPGA
    FIR filter
    heterogeneous programmable structures
    Opis:
    Distributed arithmetic is well known technique of designing FIR filters in FPGA devices. The quality of such filter implementation strongly depends on synthesis results of the DALUT block. Heterogeneity of modern FPGA structures introduces new possibilities into implementation process, that may lead to better results, but also makes it more complicated. This paper presents the simple mathematical model for estimating the necessary FPGA resources to implement DA-LUT using decomposition-based approach. The model takes into account the type of logic cells or memory blocks used for decomposition process. The proposed model is help ful to determinate the DALUT decomposition strategy for further automation of modified distributed arithmetic decomposition method.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 4; 335-344
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity Analysis of the Estimation of the Single-Number Sound Absorption Evaluation Index DLα
    Autorzy:
    Batko, W.
    Pawlik, P.
    Wszołek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/176445.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sensitivity analysis
    acoustic barriers
    interval arithmetic
    Monte Carlo method
    Opis:
    Acoustic barriers are assigned to the respective categories of sound absorbing properties on the basis of a single-number sound absorption evaluation index. Categories of absorbing properties play a significant role in selecting the barrier type for the given localisation. The estimation of the single-number sound absorption evaluation index is performed, among others, by means of measuring the sound absorption coefficient of the analysed acoustic barrier sample in the reverberation chamber. The sensitivity analysis of the determination of the single-number sound absorption evaluation index was performed in this work. The estimation of the input parameters uncertainty contribution to the expanded uncertainty of the sound absorption evaluation index, was done first. The Monte Carlo method and the reduction interval arithmetic were used for this aim. The relative sensitivity coefficients were determined by means of the author’s method based on the interval arithmetic. These coefficients contain information concerning the quantitative influence of the given input value on the final result.
    Źródło:
    Archives of Acoustics; 2017, 42, 4; 689-696
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Synthesis and Implementation of Reconfigurable PLC on FPGA Platform
    Autorzy:
    Milik, A.
    Hrynkiewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/226640.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PLC
    LD
    IL
    FPGA
    high level synthesis
    logic synthesis
    arithmetic circuits
    reconfigurable hardware
    Opis:
    The paper presents a set of algorithms dedicated for synthesis of reconfigurable logic controllers implemented on FPGA platform and programmed according to IEC1131 and EN61131. The program is compiled to hardware structure with a massive parallel processing. The developed method automatically allocates resources and operations. It controls resource usage and operation timing. Using mixed concept of operation allocation that considers operation timing and forms combinatorial chains of operations number of execution cycles can be reduced. An example of logic functions, PID controller and mixed arithmetic and logic programming examples are considered. Introducing the automatic implementation method allows flexible implementing the control algorithms. The maximal possible parallelism (limited only by the algorithm dependencies and available resources) is introduced.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 1; 85-94
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    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:
    Fuzzy arithmetical analysis of multibody systems with uncertainties
    Analiza systemów wieloczłonowych z niepewnościami wykorzystująca arytmetykę rozmytą
    Autorzy:
    Walz, N. P.
    Hanss, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/950684.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fuzzy arithmetic
    uncertainty
    multibody system
    robustness analysis
    arytmetyka rozmyta
    niepewność
    układ wieloczłonowy
    analiza odporności
    Opis:
    The consideration of uncertainties in numerical simulation is generally reasonable and is often indicated in order to provide reliable results, and thus is gaining attraction in various fields of simulation technology. However, in multibody system analysis uncertainties have only been accounted for quite sporadically compared to other areas. The term uncertainties is frequently associated with those of random nature, i.e. aleatory uncertainties, which are successfully handled by the use of probability theory. Actually, a considerable proportion of uncertainties incorporated into dynamical systems, in general, or multibody systems, in particular, is attributed to so-called epistemic uncertainties, which include, amongst others, uncertainties due to a lack of knowledge, due to subjectivity in numerical implementation, and due to simplification or idealization. Hence, for the modeling of epistemic uncertainties in multibody systems an appropriate theory is required, which still remains a challenging topic. Against this background, a methodology will be presented which allows for the inclusion of epistemic uncertainties in modeling and analysis of multibody systems. This approach is based on fuzzy arithmetic, a special field of fuzzy set theory, where the uncertain values of the model parameters are represented by so-called fuzzy numbers, reflecting in a rather intuitive and plausible way the blurred range of possible parameter values. As a result of this advanced modeling technique, more comprehensive system models can be derived which outperform the conventional, crisp-parameterized models by providing simulation results that reflect both the system dynamics and the effect of the uncertainties. The methodology is illustrated by an exemplary application of multibody dynamics which reveals that advanced modeling and simulation techniques using some well-thought-out inclusion of the presumably limiting uncertainties can provide significant additional benefit.
    Uwzględnienie niepewności w symulacji numerycznej jest generalnie rzeczą rozsadną. Podejście to często prowadzi do wiarygodnych rezultatów, toteż zyskuje na atrakcyjności w wielu dziedzinach technik symulacyjnych. Niemniej, w analizie systemów wieloczłonowych – inaczej niż w innych dziedzinach – niepewności były dotąd brane pod uwagę jedynie sporadycznie. Termin ”niepewność” jest często kojarzony z czynnikami o charakterze przypadkowym, tzn. niepewnościami aleatorycznymi, z którymi można z powodzeniem radzić sobie metodami teorii prawdopodobieństwa. W rzeczywistości, znaczna część niepewności występujących w systemach dynamicznych, a w szczególności w systemach wieloczłonowych, jest powiązana z tzw. niepewnościami epistemologicznymi, które obejmują m.in. niepewności spowodowane brakiem wiedzy, subiektywnością w implementacji modelu numerycznego, a także niepewności wynikajace z uproszczeń i idealizacji. Tak więc, by modelować niepewności epistemologiczne w systemach wieloczłonowych wymagana jest odpowiednia teoria, która wciąż stanowi poważne wyzwanie. Na tym tle, autorzy przedstawiają metodologię, która pozwala na włączenie niepewności epistemologicznych w proces modelowania i analizy systemów wieloczłonowych. Prezentowane podejście jest oparte na arytmetyce rozmytej, specjalnej dziedzinie teorii zbiorów rozmytych, gdzie niepewne wartości parametrów modelu są reprezentowane przez tzw. liczby rozmyte, które odzwierciedlają, w sposób raczej intuicyjny lecz przekonywujący, nieostry zakres możliwych wartości parametrów. W rezultacie użycia tej zaawansowanej techniki modelowania uzyskuje się bardziej wszechstronny model systemu, który daje lepsze wyniki niż modele tradycyjne, o sztywnej parametryzacji. Wyniki symulacji, uzyskane przy zastosowaniu takiego modelu, odzwierciedlają zarówno dynamikę systemu, jak i efekty związane z niepewnościami. Prezentowana metodologia jest zilustrowana przykładowym zastosowaniem do dynamiki systemu wieloczłonowego. Przykład pokazuje, że użycie zaawansowanych technik modelowania i symulacji, w których w sposób dobrze przemyślany uwzględniono prawdopodobne niepewności graniczne, może dostarczyć znacznych korzyści dodatkowych.
    Źródło:
    Archive of Mechanical Engineering; 2013, LX, 1; 109-125
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    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
    Tytuł:
    Application of Interval Arithmetic to Production Planning in a Foundry
    Autorzy:
    Duda, J.
    Stawowy, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382782.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    application of IT
    production planning
    scheduling
    uncertainty
    interval arithmetic
    przemysł odlewniczy
    zastosowanie IT
    planowanie produkcji
    harmonogram
    arytmetyka interwencyjna
    Opis:
    A novel approach for treating the uncertainty about the real levels of finished products during production planning and scheduling process is presented in the paper. Interval arithmetic is used to describe uncertainty concerning the production that was planned to cover potential defective products, but meets customer’s quality requirement and can be delivered as fully valuable products. Interval lot sizing and scheduling model to solve this problem is proposed, then a dedicated version of genetic algorithm that is able to deal with interval arithmetic is used to solve the test problems taken from a real world example described in the literature. The achieved results are compared with a standard approach in which no uncertainty about real production of valuable castings is considered. It has been shown that interval arithmetic can be a valuable method for modeling uncertainty, and proposed approach can provide more accurate information to the planners allowing them to take more tailored decisions.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 41-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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