[IEEE 2017 IEEE International Symposium on Parallel and Distributed Processing with Applications and 2017 IEEE International Conference on Ubiquitous Computing and Communications (ISPA/IUCC) - Guangzhou, China (2017.12.12-2017.12.15)] 2017 IEEE International Symposium on Parallel and Distributed Processing with Applications and 2017 IEEE International Conference on Ubiquitous Computing and Communications (ISPA/IUCC) - A Smartphone-Based Online Pedestrian Positioning Approach for Both Structured and Open Indoor Spaces