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Does anyone know if there exists a tool to generate the trend of interest in a particular research field over time?

I am particularly interested in wearable computing. I know this field has been hot for the last few years, I would like a measure of this “hotness” using academic publications relating to this area. i.e. the number of publications related to the keyword Wearable Computing.

Is there a tool that shows the trend of publications in an particular topic similar to how Google keeps track of keywords that people searches for?

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Note: I am specifically interested in technical research field, such that papers that would get published in IEEE or some computer science journals.

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I use Scopus quite a lot and it provides the ability to analyze keywords (there is a link to 'Analyze search results'): enter image description here

I was able to quickly obtain this plot for publications per year for the keyword 'wearable computing':

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It can also be restricted to particular sources. For example this one for 'wearable computing' in 'IEEE Pervasive computing':

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Unfortunately you need a subscription to access Scopus.

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It's not a tech-heavy corpus, but JSTOR's DFR does exactly what you want for the JSTOR collection.

http://dfr.jstor.org/?cs=any%3Awearable+&fs=ktm1&view=chart

JSTOR DFR

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