Cheng (IMAGE) Penn State Caption In recent research papers, Huanyu "Larry" Cheng, assistant professor of engineering science and mechanics at Penn State, addresses challenges in the wearable health devices space, such as using materials that can withstand humid environments and integrating self-charging technology. Credit Kate Myers, Penn State Usage Restrictions non commercial use only License Original 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.