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Wyświetlanie 1-4 z 4
Tytuł:
An algorithm for Bayes parameter identification with quadratic asymmetrical loss function
Autorzy:
Kulczycki, P.
Mazgaj, A.
Powiązania:
https://bibliotekanauki.pl/articles/970992.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sterowanie optymalne
parameter identification
Bayes decision
quadratic asymmetrical loss function
kernel estimators
optimal control
Opis:
The paper deals with the estimation problem of model parameter values, in tasks where overestimation implies results other than underestimation, and wliere losses arising from this can be described by a quadratic function with different coefficients characterizing positive and negative errors. In the approach presented, the Bayes decision rule was used, allowing for minimizing potential losses. Calculation algorithms were based on the theory of statistical kernel estimators, which frees the method from distribution type. The result constitutes a complete numerical procedure enabling effective calculation of the value of an identified parameter or - in the multidimensional case - the vector of parameters. The method is aimed at both of the main contemporary approaches to uncertainty modeling: probabilistic and fuzzy logic. It is universal in nature and can be applied in a wide range of tasks of engineering, economy, sociology, biomedicine and other related fields.
Źródło:
Control and Cybernetics; 2005, 34, 4; 1127-1148
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the application of statistical kernel estimators for the demand-based design of a wireless data transmission system
Autorzy:
Kulczycki, P.
Waglowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/970993.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
telekomunikacja
logika rozmyta
badania operacyjne
programowanie matematyczne
telecommunication
wireless broadband data transmission systems
LMDS
statistical kernel estimators
fuzzy logic
operations research
mathematical programming
Opis:
The subject of this paper is the task of designing the LMDS (Local Multipoint Distribution System) wireless broadband data transmission system. The methodology of statistical kernel estimators and fuzzy logic using operations research and mathematical programming is applied to find optimal locations for its basestations. A procedure which allows to obtain such locations on the basis of potential customer distribution and their expected demand, also in the cases of uncertain and non-stationary data, is investigated.
Źródło:
Control and Cybernetics; 2005, 34, 4; 1149-1167
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A complete gradient clustering algorithm formed with kernel estimators
Autorzy:
Kulczycki, P.
Charytanowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/907781.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza danych
eksploracja danych
grupowanie
metoda statystyczna
estymacja jądrowa
obliczenia numeryczne
data analysis
data mining
clustering
gradient procedures
nonparametric statistical methods
kernel estimators
numerical calculations
Opis:
The aim of this paper is to provide a gradient clustering algorithm in its complete form, suitable for direct use without requiring a deeper statistical knowledge. The values of all parameters are effectively calculated using optimizing procedures. Moreover, an illustrative analysis of the meaning of particular parameters is shown, followed by the effects resulting from possible modifications with respect to their primarily assigned optimal values. The proposed algorithm does not demand strict assumptions regarding the desired number of clusters, which allows the obtained number to be better suited to a real data structure. Moreover, a feature specific to it is the possibility to influence the proportion between the number of clusters in areas where data elements are dense as opposed to their sparse regions. Finally, the algorithm-by the detection of one-element clusters-allows identifying atypical elements, which enables their elimination or possible designation to bigger clusters, thus increasing the homogeneity of the data set.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 1; 123-134
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bayes classification of imprecise information of interval type
Autorzy:
Kulczycki, P.
Kowalski, P. A.
Powiązania:
https://bibliotekanauki.pl/articles/205655.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
data analysis
classification
imprecise information
interval type information
statistical kernel estimators
reduction in pattern size
classifier parameter correction
sensitivity method for artificial neural networks
Opis:
The subject of the investigation presented here is Bayes classification of imprecise multidimensional information of interval type by means of patterns defined through precise data, e.g. deterministic or sharp. For this purpose the statistical kernel estimators methodology was applied, which makes the resulting algorithm independent of the pattern shape. In addition, elements of pattern sets which have insignificant or negative influence on the correctness of classification are eliminated. The concept for realizing the procedure is based on the sensitivity method, used in the domain of artificial neural networks. As a result of this procedure the number of correct classifications and - above all - calculation speed increased significantly. A further growth in quality of classification was achieved with an algorithm for the correction of classifier parameter values. The results of numerical verification, carried out on pseudorandom and benchmark data, as well as a comparative analysis with other methods of similar conditioning, have validated the concept presented here and its positive features.
Źródło:
Control and Cybernetics; 2011, 40, 1; 101-123
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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