Dr. Soo-Ho Jo, from Laboratory for System Health & Risk Management (Advisor Professor Byeng Dong Youn), Department of Mechanical Engineering, Seoul National University, received the Best Presentation Paper Award presented the 2021 Fall Conference of the Korean Society of Sensors held at Rakai Sandpine, Gangneung, October 28, 2021 (Thursday)-30 (Sat), 2021.

The title of the paper is “Broadband Power Generation Using Decoupling Characteristics of Double Defects in a Phononic Crystal”. Acoustic quantum crystal refers to an artifact in which a unit lattice is arranged periodically, and from this periodic characteristic, an acoustic quantum crystal shows a band gap, a specific frequency band that does not allow waves to pass through. At this time, when a defect is artificially applied by locally breaking the periodicity in the acoustic quantum crystal, a defect band is created in the band gap, and when a wave is applied with a frequency corresponding to the defect band, the defect causes mechanical resonance and wave energy is localized near the defect. However, the defect mode-based energy localization technique has a limitation in that the harvestable bandwidth is narrow. To overcome this, by introducing spaced double defects into the acoustic quantum crystal design area, it received great attention in that it presented the possibility of a broadband energy localization technology for the first time.

In addition, Dr. Soo-Ho Jo published a paper titled "Defect-mode-inducible Energy Localization of a Phonic Crystal and Its Application to Sensing and Transducing Systems for Elastic Waves," and revealed that the defective mode of acoustic decision can be applied to measurement of acoustic waves and excitation systems.