[IEEE 2020 17th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) - Phuket, Thailand (2020.6.24-2020.6.27)] 2020 17th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) - Comparative Study of RSS-based Indoor Positioning Techniques on Two Different Wi-Fi Frequency Bands