Using Radio Frequency Signals (VIDEO) Cornell University This video is under embargo. Please login to access this video. Caption Xiaonan Hui, engineering graduate student at Cornell, uses radio frequency signals integrated with unique digital identification tags to measure his heartbeat and pulse, which together can be used to calculate blood pressure. Credit Cornell University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.