Open Access
Issue
JNWPU
Volume 37, Number 5, October 2019
Page(s) 857 - 864
DOI https://doi.org/10.1051/jnwpu/20193750857
Published online 14 January 2020

© 2019 Journal of Northwestern Polytechnical University. All rights reserved.

Licence Creative Commons
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.