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Wyszukujesz frazę "density function" wg kryterium: Temat


Tytuł:
Proofs of the normalization of the function of the thickness classes one-dimensional distributions normal
Dowody unormowania funkcji gęstości klasy jednowymiarowych rozkładów normalnych
Autorzy:
Wagner, Wiesław
Parys, Dariusz
Stępień, Lechosław
Powiązania:
https://bibliotekanauki.pl/articles/906301.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
normal distribution
normalization of density function
Opis:
Jednowymiarowy dwuparametrowy rozkład normalny należy do podstawowych rozkładów prawdopodobieństwa w statystyce. W ostatnich latach powstało wiele jego uogólnionych wersji, uwzględniających parametry asymetrii i kurtozy. Tworzą one klasę rozkładów normalnych «-parametrowych, odpowiednio z parametrami: m = 1 położenia (przesunięcia), m = 2 - położenia i zmienności (skali), m = 3 - położenia, zmienności i skośności oraz m = 4 - położenia, zmienności, skośności i spłaszczenia. W pracy podajemy 7 wybranych jednowymiarowych rozkładów prawdopodobieństwa z klasy rozkładów normalnych. Dla nich wymieniono funkcje gęstości oraz przedstawiono dowody unormowania pokazując, iż całka po obszarze określoności tych funkcji jest równa jeden.
One-dimensional two parameters the normal distribution assorts basic probability distributions in the statistics, in last years into being many generalized versions, taking into account parameters of the asymmetry and the kurtosis. They there create the class of normal distributions «-parameter, properly with parameters, m = 1 - positions (shifts), m — 2 — positions and variations (scale), m = 3 - positions, variations and skewness and m = 4 - positions, variations, skewnesses and kurtosis. On the job we give 7 chosen one-dimensional probability distributions from the class of normal distributions. For them one mentioned functions of the thickness and one averred normalizations to show, that the integral after area of the determinates of these functions is equal one.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2009, 228
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A probabilistic method of determining fatigue life of a structural component using the paris formuła and the probability density function of time of exceeding the boundary condition - an outline
Autorzy:
Tomaszek, H.
Klimaszewski, S.
Zieja, M.
Powiązania:
https://bibliotekanauki.pl/articles/245569.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
fatigue life
density function
fatigue cracking
Opis:
An attempt has been made to present a probabilistic method to determine fatigue life of an aeronautical structure's component by means of a density function of time a growing crack needs to reach the boundary condition. It has been assumed that in a component of a structure given consideration there is a small crack that grows due to fatigue load affecting it. After having reached the boundary value the component in question loses its usability. Time of the crack growth up to the boundary value is termed a fatigue life of the component. From the aspect of physics, the propagation of a crack within the component, if approached in a deterministic way, is described with the Paris 's relationship for m = 2. To model the fatigue crack growth a difference equation has been applied, from which the Fokker-Planck equation has been derived to be then followed with a density Junction of the growing crack. The in this way found density function of the crack length has been applied to find density Junction of time of reaching the boundary condition. This function has been used in the present paper to determine the randomly approached fatigue life of a component of a structure. The present paper has been prepared for the case there is coefficient m = 2 in the Paris formula. With the in the paper presented scheme, one can find fatigue life of the structure's component for the case m not equal to 2.
Źródło:
Journal of KONES; 2009, 16, 3; 431-438
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hysteresis Modeling Using a Preisach Operator
Autorzy:
Bilski, A.
Twardy, M.
Powiązania:
https://bibliotekanauki.pl/articles/226738.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Preisach operator
hysteresis
probability density function
Opis:
The aim of this paper is to present the analysis and modeling of the hysteresis phenomenon using a Preisach operator. The fundamentals of parameterized hysteresis modeling are introduced, by utilizing three probability density functions. Then, the Preisach operator and its characteristics are defined. Subsequently, results of simulations obtained by means of the aforementioned functions are presented and compared to the ones obtained by other authors.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 4; 473-478
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of kernel estimators to determine the distribution of groundwater level
Autorzy:
Michalski, A.
Powiązania:
https://bibliotekanauki.pl/articles/108518.pdf
Data publikacji:
2016
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
probability density function
kernel density estimator
groundwater level
Opis:
In this paper the problem of non-parametric estimation of the probability density function for hydrological data is considered. For a given random sample X1, X2, ..., Xn we define an estimator fˆ n of the density function ƒ based on a function K of a real variable – the so-called kernel of a distribution – and a properly chosen number sequence {hn} from the interval (0, ∞). This estimator of density function of a random variable X under more general assumptions is known in the statistical literature as the Parzen-Rosenblatt estimator or the kernel estimator. The method of kernel estimation presented in the paper has been applied to determine the probability distribution of the groundwater level based on long-term measurements made in the melioration research carried out at the foothill object Długopole.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2016, 4, 1; 41-46
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences between downhole and surface micro-seismic monitoring
Autorzy:
Święch, E.
Wandycz, P.
Powiązania:
https://bibliotekanauki.pl/articles/88996.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
Microseismic monitoring
hydraulic fracturing
probability density function
Opis:
The article presents usage of microseismic monitoring for location of microseismic events in polish geological conditions. For location of one synthetic microseismic event, two methods of acquisition were applied: surface and downhole monitoring array. Downhole microseismic monitoring is a technique of recording induced seismicity using receivers placed in the monitoring well near to the treatment well. In case of surface monitoring receivers are placed at the surface. For determination of hypocenter location probability density function was used. Based on provided analysis it is concluded that for polish conditions it is better to use downhole microseismic monitoring. Event located with usage of this technique was located correctly and uncertainty of this location was lower.
Źródło:
Mining Science; 2015, 22; 65-73
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biometric Systems Based on Palm Vein Patterns
Autorzy:
Smorawa, D.
Kubanek, M.
Powiązania:
https://bibliotekanauki.pl/articles/308356.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
palm vein
pattern recognition
two-dimensional density function
Opis:
The work covers issues related to the design of biometric systems based on the hand vascular pattern. The study includes analysis of various stages of biometric systems design ranging from acquisition, feature extraction and biometric pattern creation for verification methods. The extraction methods based on two-dimensional density function and the extraction of the characteristic points - minutiae are presented. The article features the results of tests carried out on two different bases of blood vessels in a hand.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 2; 18-22
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BIAS REDUCTION IN KERNEL ESTIMATOR OF DENSITY FUNCTION IN BOUNDARY REGION
Autorzy:
Baszczyńska, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/453760.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
kernel estimator
density function
bias reduction
reflection method
Opis:
The properties of the classical kernel estimator of density function deteriorate when the support of density function is bounded. The use of classical form of kernel estimator causes the increase of the bias estimator, particularly in the so-called boundary region, close to end of support. It can also lead to undesirable situation where density function estimator has a different support than the density function. The paper presents selected bias reduction procedures, such as reflection method and its modification. An example is presented with an attempt to compare considered procedures.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 1; 7-16
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normalizing constants for a statistic based on logarithms of disjoint m-spacings
Autorzy:
Czekała, Franciszek
Powiązania:
https://bibliotekanauki.pl/articles/1340224.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
asymptotic normality
higher-order spacings
step density function
Opis:
The paper is concerned with the asymptotic normality of a certain statistic based on the logarithms of disjoint m-spacings. The exact and asymptotic mean and variance are computed in the case of uniform distribution on the interval [0,1]. This result is generalized to the case when the sample is drawn from a distribution with positive step density on [0,1].
Źródło:
Applicationes Mathematicae; 1995-1996, 23, 4; 405-416
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shifted up cosine function as unconventional model of probability distribution
Autorzy:
Warsza, Z. L.
Korczynski, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/384539.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
probability density function PDF
cosines approximation of normal distribution
Opis:
The shifted up one period of cosine function with field under it normalized to 1 is proposed to be use as the un conventional model of probability density function (PDF). It could also approximate Normal probability distribution in the range š 2.5 standard deviation with accuracy of about š0.02, which is fully acceptable in the evaluation of measurement uncertainty. In this paper the properties of the above cosine based PDF are considered. The possibility of its applications in the routine data assessment and in virtual instruments with automatic uncertainty calcula tions is recommended.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 1; 49-55
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Models for Distribution of the Envelope and Phase of Linearly Modulated Signals in AWGN Channel
Autorzy:
Moazzeni, T
Jiang, Y.
Selvaraj, H.
Chen, T.
Powiązania:
https://bibliotekanauki.pl/articles/226459.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital modulation
linear modulation
probability density function
phase
AWGN
Opis:
In this paper, analytical expressions for the distribution of the envelope and phase of linearly modulated signals such as BPSK, M-PSK, and M-QAM in AWGN are presented. We perform numerical simulations for different orders of signal constellations. The results show that the proposed theoretical models are in excellent agreement with the estimated distributions from various numerical experiments.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 1; 79-82
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A class of unbiased kernel estimates of a probability density function
Autorzy:
Rychlik, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1340475.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
rectangular kernel
kernel function
randomized estimate
probability density function
nonparametric estimate
unbiased estimate
Opis:
We propose a class of unbiased and strongly consistent nonparametric kernel estimates of a probability density function, based on a random choice of the sample size and the kernel function. The expected sample size can be arbitrarily small and mild conditions on the local behavior of the density function are imposed.
Źródło:
Applicationes Mathematicae; 1993-1995, 22, 4; 485-497
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective Measyrand Estimators for Samples of Trapezoidal PDF-s
Autorzy:
Warsza, Z. L.
Powiązania:
https://bibliotekanauki.pl/articles/384747.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
estimators of probability density function
trapezoidal PDF
mid-range
uncertainty evaluation
Opis:
This paper is final overview of investigations on the accuracy of basic estimators of trapezoidal probability distribution samples of the measured data. For symmetrical trapezoidal PDF of straight as well concaved sides, using Monte-Carlo method of simulation, the standard deviation (SD) of linear 1- and 2-component estimators are evaluated. Approaches for theirs evaluation are proposed. It is established that in the ratio of upper and bottom bases of trapezoidal PDF in the range from 1 to 0,35 the mid-range value has smaller standard deviation (SD) than the mean value and median. It is find then for the whole family of the symmetric linear trapezoidal PDF more accurate than above single element estimators are two-component (2C) estimators as the linear form of the mean and mid-range values of the sample. Their coefficients are found, properties discussed and formulas of SD are given. The new simplified 2C-estimator of equal coefficients is also proposed. These estimators successfully extend estimation of the measurand value as the sample mean and description of its accuracy by the uncertainty type A recommended by the international guides of uncertainty evaluation in measurement GUM-2008 [1], EA-4/02 [2] and by Handbook NASA [3]. Approaches of described below investigations could be effectively applied also for other models of convoluted PDF-s.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 8-14
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical downscaling of probability density function of daily precipitation on the Polish coast
Autorzy:
Wójcik, R.
Pilarski, M.
Miętus, M.
Powiązania:
https://bibliotekanauki.pl/articles/108542.pdf
Data publikacji:
2014
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
statistical downscaling
canonical correlation
precipitation totals
probability density function
gamma distribution
Opis:
The aim of this study was to recognize the possibility of downscaling probability density function (PDF) of daily precipitation by means of canonical correlation analysis (CCA). Sea level pressure (SLP) over Europe and the North Atlantic was used as a predictor. A skilful statistical model could be used to generate projections of future changes of precipitation PDF driven by GCM (General Circulation Model) simulations. Daily precipitation totals from 8 stations located on the Polish coast of the Baltic Sea covering the period 1961-2010 were used to estimate the gamma distribution parameters, and only wet days (i.e. ≥0.1mm) were taken in the analysis. The results of the Kolmogorov-Smirnov test and comparison of empirical and theoretical (gamma-distributed) quantiles proved that gamma distribution gives a reliable description of daily precipitation totals. The validation of CCA models applied to gamma parameters revealed that the reliable reconstruction of precipitation PDF is possible only for average long-term conditions. In the case of individual months/seasons the agreement between empirical and reconstructed quantiles is poor. This study shows the potential of modelling of precipitation PDF, however efforts should be made to improve model performance by establishing more reliable links between regional forcing and the variability of the gamma parameters.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2014, 2, 1; 27-36
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pseudorandom number generator based on array probability density function method
Autorzy:
Skórkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/114341.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pseudorandom number generator
pseudorandom number
probability density function array
histogram array
Opis:
: The idea of the generation of pseudorandom numbers, forming a population of any demanded distribution of given range, there is presented in the paper. The idea is based on use the pseudorandom uniform number generator and probability density function array or histogram array of the distribution under interest. The generation examples of pseudorandom numbers forming a specified population are shown. First exemplary population is described by triangle, the second by two triangles and third isosceles trapezoid.
Źródło:
Measurement Automation Monitoring; 2016, 62, 11; 371-374
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical performance analysis of the M2M wireless link with an antenna selection system over interference limited dissimilar composite fading environments
Autorzy:
Ðošić, Danijel
Milić, Dejan
Kontrec, Nataša
Stefanović, Časlav
Milosavljević, Srðan
Stefanović, Dušan M.
Powiązania:
https://bibliotekanauki.pl/articles/2172127.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
mobile to mobile communication
vehicle to vehicle communication
Nakagami-m fading
Rice fading
probability density function
cumulative density function
urządzenia mobilne
komunikacja między pojazdami
funkcja gęstości prawdopodobieństwa
Opis:
This paper considers direct mobile-to-mobile (M2M) communications with a dual antenna selection (AS) system at a destination mobile node (DMN) in interference limited, dissimilar composite fading environments. In particular, we model dissimilar interference limited signals at the inputs of the dual branch AS system as (i) the ratio of two Nakagami-m (N) random variables (RVs) at the first branch and (ii) the ratio of two Rice RVs at the second branch, in order to account for non line-of-sight (NLOS) and line-of-sight (LOS) communications, respectively. Moreover, we assume variable powers of the desired as well as interference signals at the output of the DMN in order to account for the impact of shadowing. For the proposed model, we derive probability density functions, cumulative distribution functions, outage probabilities and average level crossing rates. The derived statistical results are evaluated for all the statistical measures considered and are graphically presented in order to provide insight into the impact of composite fading severities and LOS factors for the desired signal, as well as for the interference, on the system performances.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 4; 569--582
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł

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