JSIAM Letters
Online ISSN : 1883-0617
Print ISSN : 1883-0609
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  • Atsushi Iwasaki
    Volume 10 (2018) Pages 1-4
    Released: February 14, 2018
    JOURNALS FREE ACCESS

    NIST SP800-22 is a randomness test set applied for a set of sequences. Although SP800-22 is widely used, a rational criterion throughout all test items has not been shown. The main reason is that the dependency of test items has not been perfectly clear. In this paper, a certain scalar is computed for each sequence throughout all test items and make the histogram of the scalar. By comparing the histogram and the theoretical distribution under some assumptions, the dependency is visually shown. In addition, an algorithmic method to derive ``minimum set'' using the histogram is proposed.

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  • Takahiko Kurahashi, Kiyora Saito, Masato Nogami
    Volume 10 (2018) Pages 5-8
    Released: February 14, 2018
    JOURNALS FREE ACCESS

    We present here an estimation of a shallow water flow field based on ensemble Kalman filter FEM. With this technique, the stochastic distribution of the state variables is represented by the ensemble approximation, and the special distribution of the state variables is obtained using the FEM. The shallow water equation is employed as the governing equation, and the SUPG method, a discretization method within the FEM, is applied to discretize the governing equation. The influence of sample number on estimation accuracy and the effect of the advection term in the shallow water equation are investigated in an open-channel model.

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