Sun Hu, Associate Professor and Doctoral Supervisor at Xiamen University, has long been engaged in theoretical research, testing methodologies, instrumentation development, and application of aircraft structural state and damage characterization. Addressing the theoretical and technical challenges of "undetectable, incomplete, and inaccurate measurements" for multi-mode, multi-parameter structural states and damage in complex aircraft structures, the applicant has achieved integrated technological applications: (1) Proposed novel concepts and methods for eddy current array characterization of multi-mode/multi-parameter damage in aircraft bolted structures. (2) Proposed a high-robustness, high-precision quantitative monitoring method for plate structure states and damage under complex service environments. (3) Developed proprietary hardware/software systems for aircraft structural health monitoring.