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    Wyświetlanie 1-4 z 4
    Tytuł:
    Nonsingular unicyclic mixed graphs with at most three eigenvalues greater than two
    Autorzy:
    Gong, Shi-Cai
    Fan, Yi-Zheng
    Powiązania:
    https://bibliotekanauki.pl/articles/743659.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    unicyclic graph
    mixed graph
    Laplacian eigenvalue
    matching number
    spectrum
    Opis:
    This paper determines all nonsingular unicyclic mixed graphs on at least nine vertices with at most three Laplacian eigenvalues greater than two.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2007, 27, 1; 69-82
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control Strategy of Parallel Systems with Efficiency Optimisation in Switched Reluctance Generators
    Autorzy:
    Zan, Xiaoshu
    Lin, Hang
    Xu, Guanqun
    Zhao, Tiejun
    Gong, Yi
    Powiązania:
    https://bibliotekanauki.pl/articles/1956008.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    switched reluctance generator
    parallel system
    efficiency optimization
    differential evolution algorithm
    Opis:
    To solve motor heating and life shortening of parallel switched reluctance generator (SRG) induced by uneven output currents due to different external characteristics, we generally adopt current sharing control (CSC) to make each parallel generator undertake large load currents on average to improve the reliability of parallel power generation system. However, the method usually causes additional loss of power because it does not consider the efficiency characteristics of each parallel generator. Therefore, with the efficiency expression for the parallel system of SRG established and analysed, the control strategy based on differential evolution (DE) algorithm is proposed as a mechanism by which to enhance generating capacity and reliability of multi-machine power generation from the perspective of efficiency optimisation. We re-adjust the reference current of each parallel generator to transform the working point of each generator and implement the efficiency optimisation of parallel system. The performance of the proposed control method is evaluated in detail by the simulation and experiment, and comparison with traditional CSC is carried out as well.
    Źródło:
    Power Electronics and Drives; 2021, 6, 41; 61-74
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compressed optical image encryption in the diffractive-imaging-based scheme by input plane and output plane random sampling
    Autorzy:
    Wan, Shujia
    Gong, Qiong
    Wang, Hongjuan
    Ma, Shibang
    Qin, Yi
    Powiązania:
    https://bibliotekanauki.pl/articles/2060687.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    diffractive-imaging-based encryption
    compressive sensing
    random sampling
    Opis:
    The successful recovery of the plaintext in the simplified diffractive-imaging-based encryption (S-DIBE) scheme needs to record one intact axial intensity map as the ciphertext. By aid of compressive sensing, we propose here a new image encryption approach, referred to as compressed DIBE (C-DIBE), which allows further compression of the intensity map. The plaintext is sampled before being sent to DIBE. Afterwards, the intensity map recorded by the CCD camera is also processed by such sampling operation to generate the ciphertext. For decryption, we first obtain the sparse plaintext using the proposed phase retrieval algorithm, and then reobtain the primary plaintext from it via compressive sensing. Numerical results show that a proper proportion of the intensity map (e.g. 50%) is enough to totally recover a grayscale image. We achieve multiple-image encryption by space multiplexing without enlarging the size of the ciphertext. The robustness of C-DIBE against brute-force attack evidently outperforms S-DIBE due to the extended key space. Numerical simulation has been presented to confirm the proposal.
    Źródło:
    Optica Applicata; 2022, 52, 1; 51--66
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Color image encryption scheme based on quaternion discrete multi-fractional random transform and compressive sensing
    Autorzy:
    Ye, Huo-Sheng
    Dai, Jing-Yi
    Wen, Shun-Xi
    Gong, Li-Hua
    Zhang, Wen-Quan
    Powiązania:
    https://bibliotekanauki.pl/articles/2033985.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    color image encryption
    quaternion discrete multi-fractional random transform
    compressive sensing
    confusion-diffusion strategy
    Opis:
    A color image compression-encryption algorithm by combining quaternion discrete multi-fractional random transform with compressive sensing is investigated, in which the chaos-based fractional orders greatly improve key sensitivity. The original color image is compressed and encrypted with the assistance of compressive sensing, in which the partial Hadamard matrix adopted as a measurement matrix is constructed by iterating Chebyshev map instead of utilizing the entire Guassian matrix as a key. The sparse images are divided into 12 sub-images and then represented as three quaternion signals, which are modulated by the quaternion discrete multi-fractional random transform. The image blocking and the quaternion representation make the proposed cryptosystem avoid additional data extension existing in many transform-based methods. To further improve the level of security, the plaintext-related key streams generated by the 2D logistic-sine-coupling map are adopted to diffuse and confuse the intermediate results simultaneously. Consequently, the final ciphertext image is attained. Simulation results reveal that the proposed cryptosystem is feasible with high security and has strong robustness against various attacks.
    Źródło:
    Optica Applicata; 2021, 51, 3; 349-364
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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