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    Wyświetlanie 1-9 z 9
    Tytuł:
    Statistical models for income distribution in the socio-economic systems
    Autorzy:
    Blagun, Ivan
    Dmytryshyn, Lesya
    Powiązania:
    https://bibliotekanauki.pl/articles/419674.pdf
    Data publikacji:
    2013
    Wydawca:
    Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
    Tematy:
    income distribution
    agent-based approach
    Laplace distribution
    asymmetric Subbotin distribution
    statistical model
    socio-economic system
    Opis:
    The given article is devoted to agent-based approach used to the construction of income distribution models, at which the economic systems are designed as an aggregate of autonomous interactive agents. The considered models open a new way for the income distribution analysis, which manifests itself in the interaction between a large number of economic agents, which allows to set between the desired stationary distributions.
    Źródło:
    Nauki o Zarządzaniu; 2013, 3(16); 9-20
    2080-6000
    Pojawia się w:
    Nauki o Zarządzaniu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mean value theorems for solutions of linear partial differential equations with constant coefficients
    Twierdzenie o wartości średniej dla rozwiązań liniowych równań różniczkowych o pochodnych cząstkowych o stałych współczynnikach
    Autorzy:
    Pokrovskii, Andrei V.
    Trofymenko, Olga D.
    Powiązania:
    https://bibliotekanauki.pl/articles/699866.pdf
    Data publikacji:
    2018
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    mean value, linear partial differential operator, weak solution, Fourier-Laplace transform, distribution
    wartość średnia liniowego operatora różniczkowego cząstkowego, słabe rozwiązanie, transformata Fouriera-Laplace’a, dystrybucja
    Opis:
    https://doi.org/10.26485/0459-6854/2018/68.2/1 Wykazujemy twierdzenie o wartości średniej, które charakteryzuje ciągłe słabe rozwiązania jednorodnych liniowych równań różniczkowych cząstkowych o stałych współczynnikach w obszarach euklidesowych. W twierdzeniu tym wartość średnia funkcji gładkiej względem zespolonej miary borelowskiej na pewnej elipsoidzie specjalnej postaci jest równa pewnej kombinacji liniowej jej pochodnych cząstkowych w środku tej elipsoidy. Główny wynik pracy uogólnia znane twierdzenie Zalcmana.
    https://doi.org/10.26485/0459-6854/2018/68.2/1 We prove a mean value theorem that characterizes continuous weak solutions of homogeneous linear partial differential equations with constant coefficients in Euclidean domains. In this theorem the mean value of a smooth function with respect to a complex Borel measure on an ellipsoid of special form is equal to some linear combination of its partial derivatives at the center of this ellipsoid. The main result of the paper generalizes a well-known Zalcman’s theorem.
    Źródło:
    Bulletin de la Société des Sciences et des Lettres de Łódź, Série: Recherches sur les déformations; 2018, 68, 2; 13-24
    1895-7838
    2450-9329
    Pojawia się w:
    Bulletin de la Société des Sciences et des Lettres de Łódź, Série: Recherches sur les déformations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variational Approximations for Selecting Hierarchical Models of Circular Data in a Small Area Estimation Application
    Autorzy:
    Hernandez-Stumpfhauser, Daniel
    Breidt, F. Jay
    Opsomer, Jean D.
    Powiązania:
    https://bibliotekanauki.pl/articles/465673.pdf
    Data publikacji:
    2016
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    deviance information criterion Laplace approximation
    model selection
    projected normal distribution
    Opis:
    We consider hierarchical regression models for circular data using the projected normal distribution, applied in the development of weights for the Access Point Angler Intercept Survey, a recreational angling survey conducted by the US National Marine Fisheries Service. Weighted estimates of recreational fish catch are used in stock assessments and fisheries regulation. The construction of the survey weights requires the distribution of daily departure times of anglers from fishing sites, within spatio-temporal domains subdivided by the mode of fishing. Because many of these domains have small sample sizes, small area estimation methods are developed. Bayesian inference for the circular distributions on the 24-hour clock is conducted, based on a large set of observed daily departure times from another National Marine Fisheries Service study, the Coastal Household Telephone Survey. A novel variational/Laplace approximation to the posterior distribution allows fast comparison of a large number of models in this context, by dramatically speeding up computations relative to the fast Markov Chain Monte Carlo method while giving virtually identical results.
    Źródło:
    Statistics in Transition new series; 2016, 17, 1; 91-104
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of tribological processes in the inking unit of the offset printing machine
    Autorzy:
    Pyryev, Y.
    Piętak, Z. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386751.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    printing
    friction
    inking unit
    Laplace transform
    heat distribution
    roller-roler contact
    drukowanie
    tarcie
    zespół farbowy
    transformacja Laplace'a
    dystrybucja ciepła
    Opis:
    In this paper is proposed the mathematical description of the temperature distribution resulting from the friction between the two inking rollers (one of which is made off steel and the second one has elastic layer) in the offset printing machine. So-called in printing industry steel vibrator roller perform simultaneously rotary and reciprocating motion. This reciprocating motion is the main source of the heat generation. Using the Laplace transform method for heat conduction equations with boundary conditions taking into account the real processes taking place in the inking unit in contact area we obtained and analyzed the solution that could be useful for determination and regulation of parameters in order to decrease time of process stabilization.
    Źródło:
    Acta Mechanica et Automatica; 2013, 7, 3; 170-174
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of an MMAP/PH1, PH2/N/∞ queueing system operating in a random environment
    Autorzy:
    Kim, C.
    Dudin, A.
    Dudin, S.
    Dudina, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/330607.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    random environment
    marked Markovian arrival process
    phase type distribution
    Laplace–Stieltjes transform
    rozkład fazowy
    transformata Laplace'a-Stieltjesa
    system operacyjny
    system kolejkowy
    Opis:
    A multi-server queueing system with two types of customers and an infinite buffer operating in a random environment as a model of a contact center is investigated. The arrival flow of customers is described by a marked Markovian arrival process. Type 1 customers have a non-preemptive priority over type 2 customers and can leave the buffer due to a lack of service. The service times of different type customers have a phase-type distribution with different parameters. To facilitate the investigation of the system we use a generalized phase-type service time distribution. The criterion of ergodicity for a multi-dimensional Markov chain describing the behavior of the system and the algorithm for computation of its steady-state distribution are outlined. Some key performance measures are calculated. The Laplace–Stieltjes transforms of the sojourn and waiting time distributions of priority and non-priority customers are derived. A numerical example illustrating the importance of taking into account the correlation in the arrival process is presented.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2014, 24, 3; 485-501
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-server queueing system with external and internal customers
    Autorzy:
    Tikhonenko, O.
    Ziółkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/199838.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    single-server queueing system with non-homogeneous customers
    random volume customers
    loss probability
    total volume distribution
    Laplace transform
    Laplace-Stieltjes transform
    RAM memory space
    prawdopodobieństwo straty
    transformacja Laplace'a
    transformata Laplace'a-Stieltjesa
    pamięć RAM
    Opis:
    In the paper, we investigate a single-server queueing system with unlimited memory space and non-homogeneous customers (calls) of the two following types: 1) external customers that are served by the system under consideration, 2) internal customers that arrive and interrupt the service process only when an external customer is being served. The external customers appear according to a stationary Poisson process. Customers of each of the above-mentioned types are characterized by some random volume. The customer service time depends arbitrarily on its volume. Two schemes of customer service organization are analyzed. The non-stationary and stationary distributions of the total volume of customers present in the system are determined in terms of Laplace and Laplace-Stieltjes transforms. The stationary first and second moments of total customers volume are also calculated. The obtained results are used to approximate loss characteristics in analogous systems with limited buffer space. Numerical examples illustrating theoretical results are attached as well.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 539-551
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    M/G→ /n/0 Erlang queueing system with heterogeneous servers and non-homogeneous customers
    Autorzy:
    Ziółkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/199840.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi-server queueing systems
    queueing systems with non-homogeneous customers
    queueing systems with heterogeneous servers
    total volume distribution
    Laplace–Stieltjes transform
    system kolejkowania
    transformata Laplace'a-Stieltjesa
    dystrybucja
    Opis:
    In the present paper, we investigate a multi-server queueing system with heterogeneous servers, unlimited memory space, and non-homogeneous customers. The arriving customers appear according to a stationary Poisson process. Service time distribution functions may be different for every server. Customers are additionally characterized by some random volume. On every server, the service time of the customer depends on their volume. The number of customers distribution function is obtained in the classical model of the system. In the model with non-homogeneous customers, the stationary total volume distribution function is determined in the term of Laplace–Stieltjes transform. The stationary first and second moments of a total customers volume are calculated. An analysis of some special cases of the model and some numerical examples are also included.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 59-66
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An asymptotic expansion for the distribution of the supremum of a random walk
    Autorzy:
    Sgibnev, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1206084.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    random walk
    supremum
    submultiplicative function
    characteristic equation
    absolutely continuous component
    oscillating random walk
    stationary distribution
    asymptotic expansions
    Banach algebras
    Laplace transform
    Opis:
    Let ${S_n}$ be a random walk drifting to -∞. We obtain an asymptotic expansion for the distribution of the supremum of ${S_n}$ which takes into account the influence of the roots of the equation $1-∫_ℝe^{sx}F(dx)=0,F$ being the underlying distribution. An estimate, of considerable generality, is given for the remainder term by means of submultiplicative weight functions. A similar problem for the stationary distribution of an oscillating random walk is also considered. The proofs rely on two general theorems for Laplace transforms.
    Źródło:
    Studia Mathematica; 2000, 140, 1; 41-55
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Corrosion Inhibitors by Nuclear Quadrupole Resonance Relaxometry Method
    Autorzy:
    Sinyavsky, N. Y.
    Mershiev, I. G.
    Korneva, I. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/117155.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    corrosion inhibitor
    Nuclear Quadrupole Resonance (NQR)
    nuclear magnetic resonance (NMR)
    Regularized Inverse Laplace Transform (RILT)
    Inhibition
    corrosion
    Relaxation Time Distribution
    Nuclear Magnetization Diffusion
    Opis:
    The changes taking place with the corrosion-resistant coating, but not the state of the surface subjected to corrosion are investigated in this paper in contrast to traditional approaches. We used the method of nitrogen relaxometry NQR and multi-exponential inversion of decay of longitudinal and transverse components of the nuclear magnetization is applied for the first time for this purpose. The results of experimental studies of changes in the distributions of spin-spin and spin-lattice relaxation of crystallite powder of sodium nitrite and urotropin, the mixture of which is used as a corrosion inhibitor of ferrous metals are considered.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 4; 587-590
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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