Abstract
To study the classification and evolution of key technologies in the transportation field, the data of 36 authoritative SCI journals in the transportation field were collected from the Web of Science core collection database from 2001 to 2020. Based on the bibliometric method, this study used Python to process and visualize data, combined with bibliometric software VOSviewer to assist data visualization. Firstly, a preprocessing data algorithm was designed to deduplicate the collected data, merge synonyms, and extract key technologies. Then the paper records that contained the key technology lexicon were filtered out. Next, the annual number of publications and the distribution of key technologies over time were counted. The least squares method was used to fit the distribution of the annual proportion of the publications, and the slope k1 of the fitted linear regression equation was used to determine the research interest trend of key technologies. The key technologies were divided into “hot technology,” “cold technology,” and “other technologies,” according to the research heat trend. In order to further explore the research hotspots, the least squares method was also used to fit the citations of all technologies to obtain the slope k2. We use the Gaussian mixture model (GMM) algorithm to cluster k1 and k2 of each technology. As a result, the 144 technologies were divided into 13 super-key technologies, 60 key technologies, 59 relative key technologies, and 12 lower-key technologies. Then, the evolution of key technologies was analyzed from two perspectives of weighted evolution and cumulative evolution. And the technology evolution trend in the transportation field in the past 20 years was explored. Finally, the cooccurrence clustering method was adopted to divide key transportation technologies into five categories: vehicle technology and control, optimization algorithms and simulation techniques, artificial intelligence and big data, Internet of Things and computing, and communication technology. The research results can provide references for different people in the transportation field, including but not limited to researchers, journal editors, and funding agencies.
Highlights
To study the classification and evolution of key technologies in the transportation field, the data of 36 authoritative SCI journals in the transportation field were collected from the Web of Science core collection database from 2001 to 2020
We refer to the technology applied in the transportation field as transportation technology
Based on the literature data published in IEEE Transactions on Intelligent Transportation Systems from 2000 to 2009, Cobo et al [20] used coword analysis to detect, visualize, and evaluate ITS concepts and ITS subject areas
Summary
Classification and Evolution Analysis of Key Transportation Technologies Based on Bibliometrics. To study the classification and evolution of key technologies in the transportation field, the data of 36 authoritative SCI journals in the transportation field were collected from the Web of Science core collection database from 2001 to 2020. Tang et al [22] classified the subject categories of different research fields of core articles in IEEE Transactions on Intelligent Transportation Systems (2010–2013) by coword analysis, including vehicle control technology, modeling, simulation, and image processing. E data used in this study come from the Web of Science Database, which is the largest, most interdisciplinary, authoritative, and influential comprehensive academic information resource It contains more than 8,700 academic journals worldwide, covering natural science, social science, biomedicine, engineering technology, arts and humanities, and other fields.
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