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    Wyświetlanie 1-4 z 4
    Tytuł:
    Holomorphic functional calculus in A-pseudoconvex algebras
    Autorzy:
    Łuczak, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/962667.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Holomorphic functional calculus
    spectral mapping theorem
    A-pseudoconvex algebra
    real algebra
    Opis:
    We define and study a holomorphic functional calculus for a single element in complex and real complete A-pseudoconvex algebras with unit. As a consequence of the main result we obtain the spectral mapping theorem and existence of the logarithm and the nth root of an algebra element.
    Źródło:
    Commentationes Mathematicae; 2005, 45, 2; 161-169
    0373-8299
    Pojawia się w:
    Commentationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the axiomatic theory of spectrum II
    Autorzy:
    Mbekhta, M.
    Müller, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1287569.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    spectral mapping theorem
    ascent
    descent
    semiregular operators
    quasi-Fredholm operators
    Opis:
    We give a survey of results concerning various classes of bounded linear operators in a Banach space defined by means of kernels and ranges. We show that many of these classes define a spectrum that satisfies the spectral mapping property.
    Źródło:
    Studia Mathematica; 1996, 119, 2; 129-147
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observation and Modelling on the Shipping Noise in Shallow Waters with Complex Islands and Reefs of the East China Sea
    Autorzy:
    Peng, Zilong
    Zhou, Fulin
    Fan, Jun
    Wang, Bin
    Wen, Huabing
    Powiązania:
    https://bibliotekanauki.pl/articles/1953475.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    shipping noise
    spectral source level
    noise mapping
    shallow water
    merchant ship
    Opis:
    The impact of the noise radiated from merchant ships on marine life has become an active area of research. In this paper, a methodology integrating observation at a single location and modelling the whole noise field in shallow waters is presented. Specifically, underwater radiated noise data of opportunistic merchant ships in the waters of Zhoushan Archipelago were collected at least one day in each month from January 2015 to November 2016. The noise data were analyzed and a modified empirical spectral source level (SSL) model of merchant ships was proposed inspired by the RANDI-3 model (Research Ambient Noise Directionality) methodology. Then combining the modified model with the realistic geoacoustic parameters and AIS data of observed merchant ships, the noise mappings in this area were performed with N × 2D of Normal Mode calculations, in which the SSL of each ship was estimated using the modified model. The sound propagation at different receiving positions is different due to the shielding effect of islands and bottom topography. The methodology proposed in this paper may provide a reference for modelling shipping noise in shallow waters with islands and reefs.
    Źródło:
    Archives of Acoustics; 2021, 46, 2; 301-311
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral Mapping Using Kernel Principal Components Regression for Voice Conversion
    Autorzy:
    Song, P.
    Zhao, L.
    Bao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/177529.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spectral mapping
    overfitting
    oversmoothing
    discontinuity
    kernel principal component regression
    Opis:
    The Gaussian mixture model (GMM) method is popular and efficient for voice conversion (VC), but it is often subject to overfitting. In this paper, the principal component regression (PCR) method is adopted for the spectral mapping between source speech and target speech, and the numbers of principal components are adjusted properly to prevent the overfitting. Then, in order to better model the nonlinear relationships between the source speech and target speech, the kernel principal component regression (KPCR) method is also proposed. Moreover, a KPCR combined with GMM method is further proposed to improve the accuracy of conversion. In addition, the discontinuity and oversmoothing problems of the traditional GMM method are also addressed. On the one hand, in order to solve the discontinuity problem, the adaptive median filter is adopted to smooth the posterior probabilities. On the other hand, the two mixture components with higher posterior probabilities for each frame are chosen for VC to reduce the oversmoothing problem. Finally, the objective and subjective experiments are carried out, and the results demonstrate that the proposed approach shows greatly better performance than the GMM method. In the objective tests, the proposed method shows lower cepstral distances and higher identification rates than the GMM method. While in the subjective tests, the proposed method obtains higher scores of preference and perceptual quality.
    Źródło:
    Archives of Acoustics; 2013, 38, 1; 39-45
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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