concrete monitoring system_1 (IMAGE) National Research Council of Science & Technology Caption A researchers of ETRI are inserting the optical fiber sensor for monitoring a curing quality of concrete. Credit The sources of photos and research results from ETRI must be specified. Usage Restrictions Electronics and Telecommunications Research Institute(ETRI) 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.