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Open AccessArticle

Text Mining for Patent Analysis to Forecast Emerging Technologies in Wireless Power Transfer

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Department of Industrial Management Engineering, Korea University, 145 Anam-ro, Seongbuk, Seoul 02841, Korea
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Railroad Type Approval Team, Korea Railroad Research Institute, 176 Cheoldobangmulgwan-ro, Uiwang, Gyeonggi 16105, Korea
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Propulsion System Research Team, Korea Railroad Research Institute, 176 Cheoldobangmulgwan-ro, Uiwang, Gyeonggi 16105, Korea
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Author to whom correspondence should be addressed.
Sustainability 2019, 11(22), 6240; https://doi.org/10.3390/su11226240
Received: 11 October 2019 / Revised: 3 November 2019 / Accepted: 4 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Technologies and Innovations for Sustainable Growth)
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. View Full-Text
Keywords: wireless power transfer; electric vehicle; patent analysis; emerging technology; vacant technology wireless power transfer; electric vehicle; patent analysis; emerging technology; vacant technology
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Kim, K.H.; Han, Y.J.; Lee, S.; Cho, S.W.; Lee, C. Text Mining for Patent Analysis to Forecast Emerging Technologies in Wireless Power Transfer. Sustainability 2019, 11, 6240.

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