Congratulations to Prof. Yi-Qing Ni, a member of Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center (CNERC-Rail). He has received a patent certificate issued by Multidisciplinary Digital Publishing Institute (MDPI) in April 2022. The new patent is called 'Certificate of service as guest editor of special issue "Structural Monitoring Using Advanced NDT Techniques" '.