Перегляд за автором "Shergin, V."

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  • Зображення мініатюри
    Публікація
    Analysis of the properties of ordinary levy motion based on the estimation of stability index
    (Sofia : ITHEA, 2014) Kirichenko, L.; Shergin, V.
    The work proposes a method for estimating the stability index of alpha-stable distributions by using moments of fractional order. Provided numerical modeling has fully justified all of the results. Comparative analysis of the efficiency among the proposed method of estimating the stability index and widely used methods was performed. Proposal method is much simpler, far more faster and substantially less memory required. Estimation of generalized Hurst exponent from time series of the ordinary Lévy process was performed. Multifractal fluctuation analysis method and evaluation based on stability index estimation were compared. The results of numerical modelling showed that proposed method for estimating the fractal properties of the ordinary Lévy process, based on stability index estimation via fractional order moments is a much more accurate.
  • Зображення мініатюри
    Публікація
    Fast ray tracing algorithm for cloud slice visualization
    (ITHEA, 2010) Bilous, N.; Ostroushko, A.; Shergin, V.
    The three-dimensional computer graphic is widely used today in visualization systems of scientific researches, a computer tomography, producing of computer games, TV, animation, advertise manufacture etc. Especially high requirements are shown to realness of formed images. One of the most perspective methods is ray tracing. Fast ray tracing algorithm is proposed. This algorithm allows forming images of cloud slice according to the model described in [Ostroushko, 2010]. Using projecting ray’s classification allows excluding rays which has not crossings with cloud. Due to low memory requirements for storage of the cloud model and intermediate data fast ray tracing algorithm can be implemented on the GPU-based systems.