Dr. Dong-Jin Yoon is a principal research scientist and works at the Safety Measurement Institute of the Korea Research Institute of Standards and Science (KRISS). He is an expert in acoustic emission (AE) measurement who works on the application of AE techniques to metallic, composites, and concrete materials and structures. He is also interested in nondestructive evaluation technology using elastic waves. His recent works have focused on the structural health monitoring of damages in large structures such as underground pipelines, wind turbine blades, pressure vessels, etc. He received his PhD degree from the Korea Advanced Institute of Science and Technology (KAIST). He is currently serving as president of the Korean Society for Nondestructive Testing.