Hwajoon  Kim, 
    The Definition of Convolution in Deep Learning by using Matrix,
    Journal of Engineering and Applied Sciences,
    Volume 14,Issue 7,
    2019,
    Pages 2272-2275,
    ISSN 1816-949x,
    jeasci.2019.2272.2275,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2019.2272.2275)
    Abstract: We would like to give a mathematical concept in the establishment of definition of convolution in
deep learning and the mathematical tool used is a matrix. The methodology used is to analyze the intersection
of the mathematical meaning and the engineering meaning of the concept of convolution and through it we
would like to establish the definition of convolution to give practical help to CNN technology of deep learning.
    Keywords: Convolution;deep learning;neural networkm;tool;matrix;practical