Between 1997 and 1999, he worked for Motorola Korea Ltd., PaJu, Korea as a Computer Integrated Manufacturing (CIM) Engineer in Advanced Technology Research and Development (ATR&D).

From January 2005 to August 2007, he worked for Motorola Inc., Schaumburg Illinois, as a Senior Software Engineer in Networks and Enterprises. His research focuses in Motorola Inc. were designing protocol and network architecture of wireless broadband mission critical communications. From 2012 to 2014, he was the Chairman with the Department of Software and Communications Engineering, Hongik University, South Korea, where he is currently a Professor.

• Committee Member in the International Committee, Accreditation Board for Engineering Education of Korea (ABEEK), 25.12.2023 ~ Present.
• Research Fellow in ICT-Convergence Research Group, National Research Foundation of Korea (NRF), 01.11.2023 ~ 31.10.2025
• Adjunct Professor at Ton Duc Thang University, Ho Chi Minh City, Vietnam, 2024 ~ 2027."
• Editor, Telecommunications Systems, 2020.09 ~ Present
• Associate Editor, IEEE Access, 2018 ~ Present
• Editor, in Advances in Electrical and Electronics Engineering, 2023.07~Present.
• Associate Editor in IEIE Transactions on Smart Processing & Computing, 2023.06~Present.
• Editor in Journal of the Institute of Electronics and Information Engineers, 2020.01~Present.
• Guest Editor for Special Issue "Challenges and Opportunities in Metaverse-based Communication and Networking," IEEE Open Journal of the Communications Society, 2024
• Lead Guest Editor for Special Issue "Information-Centric Wireless Sensor Networking (ICWSN) for IoT," IEEE Internet of Things journal, 2020.
• Guest Editor for Special Issue "Novel cloud-based service/application platforms and ecosystems," Electronics, 2020.
• Lead Guest Editor for Special Issue "Information Centric Wireless Networking with Edge Computing for 5G and IoT," IEEE Access, 2019.
• Guest Editor for Special Issue on “Selected Sensor Papers from ICGHIT 2019 –The 7th International Conference on Green and Human Information Technology,” MDPI Sensors, 2018.
• Guest Editor for Special Issue on “Cross-layer Design Issues, Challenges and Opportunities for Future Intelligent Heterogeneous Networks,” Journal of Ambient Intelligence and Humanized Computing, 2017
• Guest Editor for Special Issue on Resource Management in Vehicular Ad-Hoc Networks: Energy Management, Communication Protocol and Future Applications, IEEE Access, 2016
• Lead-Guest Editor for Annual Special Issue on A Breakthrough in Multi-Hop Wireless Multimedia Sensor Networking Protocols, International Journal of Distributed Sensor Networks, from 2016 ~ Present
• Organizing Chair for ICGHIT 2024 & 2025
• TPC member of APNOMS 2023
• TPC member of NOMS 2023
• International Journal Co-Chair for ICGHIT 2019 and 2020
• Poster Session Co-Chair for APNOMS 2019
• TPC member for IEEE CAMAD 2018
• Workshop Co-Chair for ICGHIT 2018
• General Chair for 3rd IWWCN 2017
• TPC Member for ICGHIT 2016, 2017
• TPC Member of ICNISC 2017 and 2018
• TPC Member of EAI FUTURE 2016 conferences
• TPC Member of the IEEE VTC 2014-Spring
• Member of Sejongsi Construction Consideration Committee(세종특별자치시 건설심의 위원회) 2013 ~ 2015
• Member of Asan-si Design Consultative Committee(아산시 설계자문위원회), 2012 ~ 2014
• Member of Proposal Evaluation Board in National Health Insurance Service. (국민건강 보험공단 제안서평가위원) 2012 ~ 2014