Chao-Yuan Tien was born in Taiwan in 1995. He published Handwriting 99 Multiplication App on Apple’s App Store in 2018. He received the M.S. degree in applied mathematics from National Dong Hwa University, Hualien, Taiwan, in spring 2019, and the B.S. degree in applied mathematics from National Dong Hwa University, Hualien, Taiwan, in 2017. His research interesting includes Deep learning, MatConvNet deep learning, Caffe deep learning, iOS mobile App design.