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    Wyświetlanie 1-12 z 12
    Tytuł:
    Approximate bias for first-order autoregressive model with uniform innovations. Small sample case
    Autorzy:
    Nouali, Karima
    Fellag, Hocine
    Powiązania:
    https://bibliotekanauki.pl/articles/729836.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    autoregressive model
    bias
    outlier
    uniform distribution
    Opis:
    The first-order autoregressive model with uniform innovations is considered. The approximate bias of the maximum likelihood estimator (MLE) of the parameter is obtained. Also, a formula for the approximate bias is given when a single outlier occurs at a specified time with a known amplitude. Simulation procedures confirm that our formulas are suitable. A small sample case is considered only.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2002, 22, 1-2; 15-26
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bayesian estimation of AR(1) models with uniform innovations
    Autorzy:
    Fellag, Hocine
    Nouali, Karima
    Powiązania:
    https://bibliotekanauki.pl/articles/729720.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    autoregressive model
    Bayesian estimator
    prior distribution
    uniform distribution
    Opis:
    The first-order autoregressive model with uniform innovations is considered. In this paper, we propose a family of BAYES estimators based on a class of prior distributions. We obtain estimators of the parameter which perform better than the maximum likelihood estimator.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2005, 25, 1; 71-75
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On normal numbers mod $2$
    Autorzy:
    Ahn, Youngho
    Choe, Geon
    Powiązania:
    https://bibliotekanauki.pl/articles/1396059.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    coboundary
    metric density
    normal number
    uniform distribution
    Opis:
    It is proved that a real-valued function $f(x)=\exp(\pi i \chi_I(x))$, where I is an interval contained in [0,1), is not of the form $f(x)=\overline{q(2x)}q(x)$ with |q(x)|=1 a.e. if I has dyadic endpoints. A relation of this result to the uniform distribution mod 2 is also shown.
    Źródło:
    Colloquium Mathematicum; 1998, 76, 2; 161-170
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interval shrinkage estimation of the parameter of exponential distribution in the presence of outliers under loss functions
    Autorzy:
    Nasiri, Parviz
    Powiązania:
    https://bibliotekanauki.pl/articles/2108120.pdf
    Data publikacji:
    2022-09-14
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    interval information
    mean square error
    shrinkage estimator
    exponential distribution
    uniform distribution
    outliers
    Linex loss function
    Opis:
    In this paper, we studied estimators based on an interval shrinkage with equal weights point shrinkage estimators for all individual target points θ¯ ∈ (θ0, θ1) for exponentially distributed observations in the presence of outliers drawn from a uniform distribution. Estimators obtained from both shrinkage and interval shrinkage were compared, showing that the estimators obtained via the interval shrinkage method perform better. Symmetric and asymmetric loss functions were also used to calculate the estimators. Finally, a numerical study and illustrative examples were provided to describe the results.
    Źródło:
    Statistics in Transition new series; 2022, 23, 3; 65-78
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stochastic estimation of voltage sag due to faults in the power system by using PSCAD/EMTDC software as a tool for simulation
    Autorzy:
    Patne, N. R.
    Thakre, K. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/262574.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    voltage sag
    PSCAD/EMTDC
    stochastic method
    uniform fault distribution
    Opis:
    Faults in the power system are major cause of voltage sag. Voltage sag in the power system due to fault can be symmetrical or unsymmetrical. For sensitive loads it is necessary to estimate how many times in year the voltage at their terminal will experience sag to avoid tripping of operation. Several stochastic methods for estimation of number of sags are developed in recent years. In different methods of sag prediction there is need to do lengthy programming or calculations. Here PSCAD/EMTDC software package is used to estimate number of sag with uniform distribution of faults along the lines.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 59-63
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterizations of distributions by moments of order statistics when the sample size is random
    Autorzy:
    Grudzień, Zofia
    Szynal, Dominik
    Powiązania:
    https://bibliotekanauki.pl/articles/1340262.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    Poisson distribution
    logarithmic series
    binomial
    random sample size
    geometrical
    order statistics
    recurrence formula
    uniform distribution
    negative binomial
    moments
    Opis:
    We give characterizations of the uniform distribution in terms of moments of order statistics when the sample size is random. Special cases of a random sample size (logarithmic series, geometrical, binomial, negative binomial, and Poisson distribution) are also considered.
    Źródło:
    Applicationes Mathematicae; 1995-1996, 23, 3; 305-318
    1233-7234
    Pojawia się w:
    Applicationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Modified Penetration Model for Copper-Tungsten Shaped Charge Jets with Non-uniform Density Distribution
    Autorzy:
    Elshenawy, T.
    Elbeih, A.
    Li, Q. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358894.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    shaped charge
    jet penetration
    virtual origin
    non-uniform density distribution
    Opis:
    The penetration of a shaped charge jet with non-uniform density distribution was studied. The virtual origin model, which assumes a constant jet density, was modified to include the situation where the jet density deficit/reduction of an un-sintered copper-tungsten powder jet causes a non-uniform jet density distribution. A relation between the relative density ratio and the normalised jet velocity is proposed, based on which an analytical solution of the modified virtual origin model is obtained. The validity of the modified virtual origin model was demonstrated by its largely improved prediction in comparison with experimental and numerical results. It showed that the density reduction term reduces the penetration depth by 16.58% for an un-sintered copper-tungsten powder jet.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 4; 927-943
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    One step further : an explicit solution to Robbins’ problem when n = 4
    Autorzy:
    Dendievel, Rémi
    Swan, Yvik
    Powiązania:
    https://bibliotekanauki.pl/articles/747392.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    uniform distribution, optimal stopping
    Optymalne zatrzymanie procesu, problem wyboru najlepszego obiektu, problem opymalnego wielokrotnego zatrzymania, proces Poissona
    Opis:
    Niech X(1),X(2), ...,X(n) będzie ciągiem niezależnych zmiennych losowych o rozkładzie jednostajnym na [0,1]. Statystyk  obserwuje realizacje tych zmiennych sekwencyjnie i  po każdej obserwacji decyduje o jej zatrzymaniu lub odrzuceniu. Zaakceptowanej obserwacji nie można w przyszłości zmieniać ani wracać do odrzuconych obserwacji.  Celem jest minimalizacja oczekiwanej rangi zaakceptowanej obserwacji. Ten artykuł podaje rozwiązanie tego zadania dla  n = 4. Problem w literaturze jest znany jako problem Robinsa.
    Let X1,X2, . . . ,Xn be independent random variables drawn from the uniform distribution on [0, 1]. A decision maker is shown the variables sequentially and, after each observation, must decide whether or not to keep the current one, with payoff being the overall rank of the selected observation. Decisions are final: no recall is allowed. The objective is to minimize the expected payoff. In this note we give the explicit solution to this problem, known as Robbins' problem of optimal stopping, when n = 4.
    Źródło:
    Mathematica Applicanda; 2016, 44, 1
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Analysis of Unit Friction Force Working on the Metal Contact Surface with the Roll Change during Feedstock with Non-Uniform Temperature Distribution Rolling Process
    Autorzy:
    Sygut, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/353951.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    continuous rolling process in grooves
    non-uniform temperature distribution
    unit friction force working on the metal contact surface with the roll
    FEM
    round bars quality
    Opis:
    The paper presents the results of theoretical studies influence of non-uniform temperature distribution along the feedstock length to the unit friction force working on the metal contact surface with the roll change during the round bars 70 mm in diameter continuous rolling process. This value is one of the major factors affecting the grooves wear during the rolling process. The studies were carried out based on the actual engineering data for 160 × 160 mm square cross-section feedstock of steel S355J0. Numerical modelling of the rolling process was performed using Forge2008®, a finite-element based computer program.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 927-932
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hybrid statistical approach for texture images classification based on scale invariant features and mixture gamma distribution
    Autorzy:
    Benlakhdar, Said
    Rziza, Mohammed
    Thami, Rachid Oulad Haj
    Powiązania:
    https://bibliotekanauki.pl/articles/29520269.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    statistical image modeling
    SIFT
    mixture gamma distribution
    uniform discrete curvelet transform
    classification
    Opis:
    Image classification refers to an important process in computer vision. The purpose of this paper is to propose a novel approach named GGD-GMM and based on statistical modeling in wavelet domain to describe textured images and rely on number of principles which give its internal coherence and originality. Firstly, we propose a robust algorithm based on the combination of the wavelet transform and Scale Invariant Feature Transform. Secondly, we implement the aforementioned algorithm and fit the result using the finite mixture gamma distribution (GMM). The results, obtained for two benchmark datasets, show that the proposed algorithm has a good relevance as it provides higher classification accuracy compared to some other well known models see (Kohavi, 1995). Moreover, it shows other advantages relied to Noise-resistant and rotation invariant.
    Źródło:
    Computer Methods in Materials Science; 2020, 20, 3; 95-106
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surrogate synthesis of excitation systems for frame tangential eddy current probes
    Autorzy:
    Halchenko, Volodymir Yakovych
    Trembovetska, Ruslana Volodymyrivna
    Tychkov, Volodymir Volodymyrovych
    Powiązania:
    https://bibliotekanauki.pl/articles/1955174.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive neural network regression
    eddy current probe
    stochastic optimization algorithm
    surrogate optimization
    uniform eddy current density distribution
    velocity effect
    addytywna regresja sieci neuronowej
    sonda prądów wirowych
    algorytm optymalizacji stochastycznej
    optymalizacja zastępcza
    równomierny rozkład gęstości prądów wirowych
    efekt prędkości
    Opis:
    Existing scientific studies devoted to the design of eddy-current probes with a priori given configuration of the electromagnetic excitation field, which provide a uniform eddy current density distribution, consider a wide class of such, but are limited to the case when the probe is stationary relative to the testing object. Therefore, the actual problem is the synthesis of moving tangential eddy current probes with a frame excitation system that provides a uniform eddy current density distribution in the testing object, the solution of which is proposed in this study. A mathematical method for nonlinear surrogate synthesis of excitation systems for frame moving tangential surface eddy current probes, which implements a uniform eddy current density distribution of the testing zone object, is proposed. A metamodel of the volumetric structure of the excitation system of the frame tangential eddy current probe, applied in the process of surrogate optimal parametric synthesis, has been created. The examples of nonlinear synthesis of excitation systems using modern metaheuristic stochastic algorithms for finding the global extremum are considered. The numerical results of the obtained solutions of the problems are presented. The efficiency of the synthesized structures of excitation systems in comparison with classical analogs is shown on the graphs of the eddy current density distribution on the object surface in the testing zone.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 743-757
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laminar flow past the bottom with obstacles – a suspension approximation
    Autorzy:
    Wojnar, R.
    Bielski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/199808.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Stokes flow
    Einstein’s suspension
    Brinkman’s suspension
    non-uniform viscosity
    velocity distribution
    wastes
    plants on the bottom
    przepływ Stokesa
    lepkość
    rozkład prędkości
    odpady
    Opis:
    From Albert Einstein’s study (1905) it is known that suspension introduced to a fluid modifies its viscosity. We propose to describe the influence of obstacles on the Stokesian flow as a such modification. Hence, we treat the fluid flow through small obstacles as a flow with suspension. The flow is developing past the plane bottom under the gravity force. The spatial distribution of suspension concentration is treated as given, and is regarded as an approximation of different obstacles which modify the fluid flow and change its viscosity. The different densities of suspension are considered, beginning of small suspension concentration until 40%. The influence of suspension concentration on fluid viscosity is analyzed, and Brinkman’s formula as fitting best to experimental data is applied.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 685-695
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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