“Smartphone based 3D PDR System Development and its Performance Analysis in Various Indoor Environment Oct 1, 2014· Beomju Shin , Seok Lee , Chulki Kim , Jaehun Kim Changdon Kee Taikjin Lee · 0 min read Last updated on Oct 1, 2014 Authors Beomju Shin Ph.D Authors Changdon Kee Professor Authors Taikjin Lee Ph.D ← “Precise Orbit Determination of LEO Satellites with Less than Four Visible GPS Satellites Oct 1, 2014 “Inertial Aided Cycle Slip Detection by Considering Satellite Geometry for Land Vehicle Sep 1, 2014 →