Journal of the Korea Society of Computer and Information (한국컴퓨터정보학회논문지)

Korean Society of Computer Information (한국컴퓨터정보학회)
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The Strategy of Wireless Power Transfer for Light Rail Transit By Core Technologies Analysis Based on Text Mining

  • Meng, Xiang-Yu (Dept. of Industrial Management Engineering, Korea University) ;
  • Han, Young-Jae (Railroad Type Approval Team, Korea Railroad Research Institute) ;
  • Eum, Soo-Min (Dept. of Industrial Management Engineering, Korea University) ;
  • Cho, Sung-Won (Dept. of Industrial Management Engineering, Korea University)
  • Received : 2018.10.19
  • Accepted : 2018.11.16
  • Published : 2018.11.30
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Abstract

In this paper, we extracted relevant patent data and conducted statistical analysis to understand the technical development trend related to Wireless Power Transfer (WPT) for Light Rail Transit (LRT). Recently, with the development of WPT technologies, the Light Rail Transit (LRT) industry is concentrating on applying WPT to the power supply system of trains because of their advantages compared wired counterpart, such as low maintenance cost and high stability. This technology is divided into three areas: wireless feeding and collecting technology, high-frequency power converter technology and orbital and infrastructure technology. From each specific area, key words in patent document were extracted by TF-IDF method and analyzed by social network. In the keyword network, core word of each specific technology were extracted according to their degree centrality. Then, the multi-word phrases were also built to represent the concept of core technologies. Finally, based on the analysis results, the development strategies for each specifics technical area of WPT in LRT filed will be provided.

Keywords

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Fig. 1. Patent status for each country

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Fig. 2. Patent status for each technology category

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Fig. 3. Patent status for main applicants

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Fig 4. SNA graph by Correlation analysis for each technologies (a) Wireless Feeding and Collecting Technology (b) High-frequency Power Converter Technology (c) Orbital and Infrastructure Technology

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Fig 5. Core word SNA graph for each technologies (a) Wireless Feeding and Collecting Technology (b) High-frequency power converter Technology (c) Orbital and Infrastructure Technology

Table 1. Top20 Keywords based on TF-IDF

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Table 2 Degree of each keyword using SNA graph

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Table 3. Correlations between Cores and linked words for each technologies

CPTSCQ_2018_v23n11_193_t0003.png 이미지

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