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Wyświetlanie 1-15 z 174
Tytuł:
Generalized Levinsons inequality and exponential convexity
Autorzy:
Pecaric, J.
Praljak, M.
Witkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/255037.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Levinson's inequality
exponential convexity
Opis:
We give a probabilistic version of Levinson's inequality under Mercer's assumption of equal variances for the family of 3-convex functions at a point. We also show that this is the largest family of continuous functions for which the inequality holds. New families of exponentially convex functions and related results are derived from the obtained inequality.
Źródło:
Opuscula Mathematica; 2015, 35, 3; 397-410
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized derivations and generalized exponential monomials on hypergroups
Autorzy:
Fechner, Żywilla
Gselmann, Eszter
Székelyhidi, László
Powiązania:
https://bibliotekanauki.pl/articles/29519377.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
moment function
moment sequence
exponential monomial
exponential polynomial
derivation
higher order derivation
hypergroup
Opis:
In one of our former papers Endomorphisms of the measure algebra of commutative hypergroups we considered exponential monomials on hypergroups and higher order derivations of the corresponding measure algebra. Continuing with this, we are now looking for the connection between the generalized exponential polynomials of a commutative hypergroup and the higher order derivations of the corresponding measure algebra.
Źródło:
Opuscula Mathematica; 2023, 43, 4; 493-505
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forecasting the sales of console games for the Italian market
Autorzy:
Rossetti, Renato
Powiązania:
https://bibliotekanauki.pl/articles/425197.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
exponential smoothing
SARIMA
forecast
videogames
Opis:
In videogames industry, time series analysis can be very useful in determining the general evolution and behaviour of the market dynamics. These methods are applicable to any time series forecasting problem, regardless of the application sector. This article discusses time series approaches to forecast the sales of console games for the Italian market. In particular two univariate techniques were evaluated, exponential smoothing and the SARIMA technique. The aim is to exploit the capabilities of these statistical methods in order to have a comparison of the results and to choose the most accurate model through an ex-post evaluation. Using monthly time-series data from November 2005 to September 2017, the selection of the most suitable model was indicated by the smallest value of the measures of accuracy (MAPE, sMAPE, RMSE) for the out-of-sample observations regarding the period October 2017-September 2018. The implementation of the models was done using Forecast PRO and Gretl. The time series involved is related to the sales regarding the first party manufacturers of consoles and handhelds (Microsoft, Sony and Nintendo).
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2019, 23, 3; 76-96
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predictive modeling and analysis of changes migrations in Poland
Autorzy:
Monika Nawrocka, Monika Nawrocka
Powiązania:
https://bibliotekanauki.pl/articles/1179772.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
dynamics migration
exponential smoothing
forecasting
Opis:
The development of the research in economy has shown that conducting mathematical modeling and statistics is an effective instrument for diagnosing the progress phenomenon of socio-economic. It provides the information about the dynamics of result changeability in different periods of time. Additionally statistical analysis allows determining the prediction for periods of future and past years. Migrations is characterized by the quality of being measurable because it includes quantitative data. In recent years, demonstrate high dynamics. Conducting the analyses and calculations based on methods and statistical instruments will result in the opportunity to compare, group, analysis variables, specify trends and designate the diagnoses of achieved sports results with the implementation of the optimum vector of variables of independent variable of migrations. An analysis of the dynamics migration variability was carried out on the basis of data from the website of the main statistical office, in this article. Used the statistical methods and the testing of interdependencies. Additionally, the models of time series have been used for the sake of the analysis. The most significant aim of the analysis of the dynamics is the designation of predictions. The use of the model of time series has the task of the specification of the change of the phenomenon level in time.
Źródło:
World Scientific News; 2017, 72; 467-481
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exponential stability results for variable delay difference equations
Autorzy:
Yankson, Ernest
Powiązania:
https://bibliotekanauki.pl/articles/1397336.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
exponential stability
Lyapunov functional
instability.
Opis:
Sufficient conditions that guarantee exponential decay to zero of the variable delay difference equation $x(n + 1) = a(n)x(n) + b(n)x(n − g(n))$ are obtained. These sufficient conditions are deduced via inequalities by employing Lyapunov functionals. In addition, a criterion for the instability of the zero solution is established. The results in the paper generalizes some results in the literature.
Źródło:
Opuscula Mathematica; 2021, 41, 1; 145-155
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hereditary Equality of Domination and Exponential Domination
Autorzy:
Henning, Michael A.
Jäger, Simon
Rautenbach, Dieter
Powiązania:
https://bibliotekanauki.pl/articles/31342424.pdf
Data publikacji:
2018-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
domination
exponential domination
hereditary class
Opis:
We characterize a large subclass of the class of those graphs G for which the exponential domination number of H equals the domination number of H for every induced subgraph H of G.
Źródło:
Discussiones Mathematicae Graph Theory; 2018, 38, 1; 275-285
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compatibility of the λ- Kolmogorov test for the brake disc emissivity factor distribution in thermal imaging studies
Autorzy:
Sawczuk, W.
Pagórek, B.
Powiązania:
https://bibliotekanauki.pl/articles/114266.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
emissivity factor
brake disc
exponential distribution
Opis:
A thermal imaging camera is widely used in railway, it allows evaluating the wheel-rail contact while rolling the wheel set on the rails [3], cracks of the railway tracks [22] or identify overheated axle bearings of the wheel sets of the railway cars. In studies of braking systems both railway and vehicular ones on brake positions, the thermal imaging measurements are little used. Only in the qualitative assessment, an IR camera can identify the phenomenon of "hot spots" on the brake disc [1, 12, 15]. When testing the disc brake friction pairs, the most difficult is the brake disc and determination of its actual temperature which, due to the polished smooth surface by friction with the friction pad, is a low-carbon object. This type of objects force the person who makes the measurements to do a very precise configuration of the thermal imaging camera in order to determine the emissivity factor. An additional difficulty in the thermal imaging of braking systems is a dynamically changeable nature of the work associated with changes in the rotational speed of the brake disc and a nonlinear increase in its temperature. The paper presents the results of the studies conducted parallel with the thermal imaging measurements by using thermocouples to determine variability of the experimental emissivity factor of the brake disc supported by the λ-Kolmogorov compatibility test.
Źródło:
Measurement Automation Monitoring; 2016, 62, 2; 56-61
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An exponential estimate for convolution powers
Autorzy:
Jones, Roger L.
Powiązania:
https://bibliotekanauki.pl/articles/1216222.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
maximal functions
exponential estimates
convolution powers
Opis:
We establish an exponential estimate for the relationship between the ergodic maximal function and the maximal operator associated with convolution powers of a probability measure.
Źródło:
Studia Mathematica; 1999, 137, 2; 195-202
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polynomial stability of evolution operators in Banach spaces
Autorzy:
Megan, M.
Ceausu, T.
Ramneantu, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/254941.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
evolution operator
polynomial stability
exponential stability
Opis:
The paper considers three concepts of polynomial stability for linear evolution operators which are defined in a general Banach space and whose norms can increase not faster than exponentially. Our approach is based on the extension of techniques for exponential stability to the case of polynomial stability. Some illustrating examples clarify the relations between the stability concepts considered in paper. The obtained results are generalizations of well-known theorems about the uniform and nonuniform exponential stability.
Źródło:
Opuscula Mathematica; 2011, 31, 2; 279-288
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing on the first-order autoregressive model with contaminated exponential white noise finite sample case
Autorzy:
Fellag, Hocine
Powiązania:
https://bibliotekanauki.pl/articles/729886.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
autoregressive model
exponential distribution
outlier
test
Opis:
The testing problem on the first-order autoregressive parameter in finite sample case is considered. The innovations are distributed according to the exponential distribution. The aim of this paper is to study how much the size of this test changes when, at some time k, an innovation outlier contaminant occurs. We show that the test is rather sensitive to these changes.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2001, 21, 1; 11-20
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limits of stabilization of a networked hyperbolic system with a circle
Autorzy:
Gugat, Martin
Huang, Xu
Wang, Zhiqiang
Powiązania:
https://bibliotekanauki.pl/articles/31342765.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
hyperbolic system
exponential stability
circle
network
Opis:
This paper is devoted to the discussion of the exponential stability of a networked hyperbolic system with a circle. Our analysis extends an example by Bastin and Coron about the limits of boundary stabilizability of hyperbolic systems to the case of a networked system that is defined on a graph which contains a cycle. By spectral analysis, we prove that the system is stabilizable while the length of the arcs is sufficiently small. However, if the length of the arcs is too large, the system is not stabilizable. Our results are robust with respect to small perturbations of the arc lengths. Complementing our analysis, we provide numerical simulations that illustrate our findings.
Źródło:
Control and Cybernetics; 2023, 52, 1; 79-121
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 174

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