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    Wyświetlanie 1-4 z 4
    Tytuł:
    Electrically conducting flow through exponential power law fluid with variable thermal conductivity
    Autorzy:
    Ferdows, M.
    Bangalee, M. Z. I.
    Liu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/265439.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    magnetohydrodynamika
    warstwa graniczna
    podobieństwa
    MHD
    similarity solution
    variable properties
    boundary layer flow
    exponential law
    Opis:
    The problem of exponential law of steady, incompressible fluid flow in boundary layer and heat transfer are studied in an electrically conducting fluid over a semi-infinite vertical plate assuming the variable thermal conductivity in the presence of a uniform magnetic field. The governing system of equations including the continuity equation, momentum equation and energy equation have been transformed into nonlinear coupled ordinary differential equations using appropriate similarity variables. All the numerical and graphical solutions are obtained through the use of Maple software. The solutions are found to be dependent on three dimensionless parameters including the magnetic field parameter M, thermal conductivity parameter and Prandtl number Pr. Representative velocity and temperature profiles are presented at various values of the governing parameters. The skin-friction coefficient and the rate of heat transfer are also calculated for different values of the parameters.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 539-548
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sender-equivocable encryption schemes secure against chosen-ciphertext attacks revisited
    Autorzy:
    Huang, Z.
    Liu, S.
    Qin, B.
    Chen, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/330140.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sender equivocable encryption
    chosen ciphertext attack
    cross authentication code
    Opis:
    Fehr et al. (2010) proposed the first sender-equivocable encryption scheme secure against chosen-ciphertext attacks (NCCCA) and proved that NC-CCA security implies security against selective opening chosen-ciphertext attacks (SO-CCA). The NC-CCA security proof of the scheme relies on security against substitution attacks of a new primitive, the “cross-authentication code”. However, the security of the cross-authentication code cannot be guaranteed when all the keys used in the code are exposed. Our key observation is that, in the NC-CCA security game, the randomness used in the generation of the challenge ciphertext is exposed to the adversary. Based on this observation, we provide a security analysis of Fehr et al.'s scheme, showing that its NC-CCA security proof is flawed. We also point out that the scheme of Fehr et al. encrypting a single-bit plaintext can be refined to achieve NC-CCA security, free of the cross-authentication code. Furthermore, we propose the notion of “strong cross-authentication code”, apply it to Fehr et al. 's scheme, and show that the new version of the latter achieves NC-CCA security for multi-bit plaintexts.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 2; 415-430
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hierarchical inferential method for indoor scene classification
    Autorzy:
    Jiang, J.
    Liu, P.
    Ye, Z.
    Zhao, W.
    Tang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/330842.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    indoor scene classification
    semantic hierarchical structure
    rule based inference
    Markov logic network
    struktura hierarchiczna
    regułowy system wnioskowania
    sieć logiczna Markova
    Opis:
    Indoor scene classification forms a basis for scene interaction for service robots. The task is challenging because the layout and decoration of a scene vary considerably. Previous studies on knowledge-based methods commonly ignore the importance of visual attributes when constructing the knowledge base. These shortcomings restrict the performance of classification. The structure of a semantic hierarchy was proposed to describe similarities of different parts of scenes in a fine-grained way. Besides the commonly used semantic features, visual attributes were also introduced to construct the knowledge base. Inspired by the processes of human cognition and the characteristics of indoor scenes, we proposed an inferential framework based on the Markov logic network. The framework is evaluated on a popular indoor scene dataset, and the experimental results demonstrate its effectiveness.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 4; 839-852
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An efficient algorithm for estimating the parameters of superimposed exponential signals in multiplicative and additive noise
    Autorzy:
    Bian, J.
    Peng, H.
    Xing, J.
    Liu, Z.
    Li, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/331007.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    superimposed exponential signals
    modified Newton–Raphson algorithm
    multiplicative noise
    additive noise
    least squares estimator
    algorytm Newtona-Raphsona
    metoda najmniejszych kwadratów
    estymator
    Opis:
    This paper considers parameter estimation of superimposed exponential signals in multiplicative and additive noise which are all independent and identically distributed. A modified Newton–Raphson algorithm is used to estimate the frequencies of the considered model, which is further used to estimate other linear parameters. It is proved that the modified Newton–Raphson algorithm is robust and the corresponding estimators of frequencies attain the same convergence rate with Least Squares Estimators (LSEs) under the same noise conditions, but it outperforms LSEs in terms of the mean squared errors. Finally, the effectiveness of the algorithm is verified by some numerical experiments.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2013, 23, 1; 117-129
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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