bong Kim, Ki, Ki mun Keum, Chang bok Jang, and Oh Seok Kwon. 2018. “Verification and Power Consumption Measurement of ‘eid Signal in Eddy Stone Beacon”. International Journal of Engineering & Technology 7 (2.12): 304-7. https://doi.org/10.14419/ijet.v7i2.12.11311.