Dr. Mingjing Cai is currently Associate Professor at Guangzhou Institute of Technology, Xidian University. He obtained Bachelor and Master degrees from South China University of Technology in 2013 and 2016, respectively. Dr. Cai obtained his PhD from The Chinese University of Hong Kong in 2020, under the supervision of Prof. Wei-Hsin Liao. His research interests include energy harvesting, self-powered IoT systems and advanced robotics.

More information can be found here.   

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Selected Journal Papers: (*corresponding author)

  1. Q. Lu, G. XiaM. Cai*, X. Li, J. Cao, W. H. Liao*, "An Ultra-low Frequency Energy Harvester with An Asymmetric-stiffness Pendulum Inspired by Biological Grooming Behavior,” IEEE Internet Things J., Accepted, 2024.(IF 10.238)

  2. M. Cai and W. H. Liao, “Towards High-Performance Wrist-Worn Energy Harvester via Hybrid Approach,” IEEE/ASME Trans. Mechatron, Accepted, 2024. (IF 5.867)

  3. G. Xia; Q Lu; M. Cai*; X. Li; D. Zhang; C. Wang; Wei-Hsin Liao*,“Comprehensive Investigation of a Broadband Wearable Energy Harvester Using Adaptive Kinetic Energy Reallocation Mechanism,” Mech. Syst. Signal Process., 206, 110907, 2024. (IF 8.934)

  4. M. Cai and W.H. Liao, “A Coaxial Wrist-worn Energy Harvester for Self-Powered Internet of Things Sensors,” IEEE Internet Things J., 10(1), 133-143, 2023. (IF 10.238)

  5. M. Cai and W. H. Liao, “Design, Modeling and Experiments of Electromagnetic Energy Harvester Embedded in Smart Watch and Wristband as Power Source,” IEEE/ASME Trans. Mechatron, 26(4), 2104-2114, 2021. (IF 5.867)

  6. M. Cai and W.H. Liao, “High Power Density Inertial Energy Harvester Without Additional Proof Mass for Wearables,” IEEE Internet Things J., 8(1), 297-308, 2021. (IF 10.238)

  7. M. Cai and W.H. Liao, “Enhanced Electromagnetic Wrist-Worn Energy Harvester Using Repulsive Magnetic Spring,” Mech. Syst. Signal Process., 150, 107251, 2021. (IF 8.934)

  8. M. Cai, Z. Yang, J. Cao, and W. H. Liao, “Recent Advance in Human Motion Excited Energy Harvesting Systems for Wearables,” Energy Technol., 8, 2000533, 2020. (IF 4.149) 

  9. M. Cai, J. Wang, and W.H. Liao, “Self-Powered Smart Watch and Wristband Enabled by Embedded Generator,” Appl. Energy, 263, 114682, 2020. (IF 11.446)

  10. M. Cai, W. H. Liao, and J. Cao, “A Smart Harvester for Capturing Energy from Human Ankle Dorsiflexion with Reduced User Effort,” Smart Mater. Struct., 28(1), 015026, 2019. (IF 4.131) 

Conference Papers

  • M. Cai and W. H. Liao, “Towards Self-Powered Wearables via Wrist-Worn Energy Harvesters,” 13th International Conference on Applied Energy, 2021.

  • M. Cai and W. H. Liao, “Design of Smart Harvester for Capturing Energy from Human Ankle Dorsiflexion to Reduce User Effort,” Proc. SPIE 10598, 105982Q, 2018


  1. M. Cai, W.H. Liao, G. Xia, X. Li, D. Zhang, C. Wang, G. Hu, “A Wearable Broadband Biomechanical Energy Harvester Apparatus and Method Thereof,” China patent application: 202310469383.6, 2023.

  2. W.H. Liao, M. Cai, Biokinetic Energy Collection Apparatus and Fabrication Method Thereof,” PCT patent application: PCT/CN2022/120715,2022.

  3. W.H. Liao, M. Cai, Biokinetic Energy Collection Apparatus and Fabrication Method Thereof,” US Patent application: 17/944,286,2022.

  4. W.H. Liao, M. Cai, “Apparatus and Method of Embedded Biomechanical Energy Harvester for Wearables,” China Patent Application: 202111120926.0, 2021.

  5. W.H. Liao, M. Cai, and J. Wang, “Human Motion Energy Harvesting Apparatus and Conversion Method,” US Patent: 11,316,405, 2022, and China Patent: 201910104425, 2023.

Honors and Awards

  • ASME 2020 Energy Harvesting Best Paper Award

  • Faculty Outstanding PhD Thesis Award 2020

  • Second Class Award, Guangdong Province Science and Technology Progress Award

  • Gold Medal, The 48th International Exhibition of Inventions of Geneva

  • Best Student Poster Award, The 2nd International Conference on Vibration and Energy Harvesting Applications

  • First Runner-Up, Professor Charles K.Kao Student Creativity Awards

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