Text mining for patent analysis to forecast emerging technologies in wireless power transfer

Ki Hong Kim, Young Jae Han, Sugil Lee, Sung Won Cho, Chulung Lee

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Governments around the world are planning to ban sales of vehicles running on petroleum-based fuels as an effort to reduce greenhouse gas emissions, and electric vehicles surfaced as a solution to decrease pollutants produced by the transportation sector. As a result, wireless power transfer technology has recently gained much attention as a convenient and practical method for charging electric vehicles. In this paper, patent analysis is conducted to identify emerging and vacant technology areas of wireless power transfer. Topics are first extracted from patents by text mining, and the topics with similar semantics are grouped together to form clusters. Then, the process of identifying emerging and vacant technology areas is improved by applying a time series analysis and innovation cycle of technology to the clustering result. Lastly, the results of clustering, time series, and innovation cycle are compared to minimize the possibility of misidentifying emerging and vacant technology areas, thus improving the accuracy of the identification process and the validity of the identified technology areas. The analysis results revealed that one emerging technology area and two vacant technology areas exist in wireless power transfer. The emerging technology area identified is circuitries consisting of transmitter coils and receiver coils for wireless power transfer, and the two vacant technology areas identified are wireless charging methods based on resonant inductive coupling and wireless power transfer condition monitoring methods or devices.

Original languageEnglish
Article number6240
JournalSustainability (Switzerland)
Issue number22
Publication statusPublished - 2019 Nov 1


  • Electric vehicle
  • Emerging technology
  • Patent analysis
  • Vacant technology
  • Wireless power transfer

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Renewable Energy, Sustainability and the Environment
  • Environmental Science (miscellaneous)
  • Energy Engineering and Power Technology
  • Management, Monitoring, Policy and Law


Dive into the research topics of 'Text mining for patent analysis to forecast emerging technologies in wireless power transfer'. Together they form a unique fingerprint.

Cite this