I am Yuanyi Sun who is the owner of this website. My screen name is HKHK and now I am a computer science Ph.D. Candidate at the Pennsylvania State University-University Park. I received my M.S. degree from Stevens Institute of Technology and B.S. degree from China Agricultural University. My research mainly focused on security, privacy, vision, deep learning, and machine learning. I am also good at coding. I got some prizes in some coding competition. I also develop some product software that can be easily found on this site.