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As known by us, this article is the first work focusing on this problem, which is an important step for identifying entities in cyber-physical system data. Directed by the initial entities, utilizing the relaxation and verification techniques, [Formula: see text] provides a path expression\u2013based solution for entity extraction problem, which has following characteristics. First, using path expressions, [Formula: see text] provides a condensed presentation for entity locations whose size may get very large when scaling up the data size. Second, requiring only one entity example to indicate the interests, using relaxation technique, [Formula: see text] can discover other similar entities automatically. Third, by adjusting the example given to [Formula: see text], users can specify their own interesting entities and control the entities discovered by [Formula: see text]. Besides, utilizing the idea of sharing computations, by extending previous automaton techniques, an efficient implementation of [Formula: see text] is provided. Experimental results are reported, which show that [Formula: see text] can provide an effective and efficient solution to the entity extraction problem. <\/jats:p>","DOI":"10.1177\/1550147717702653","type":"journal-article","created":{"date-parts":[[2017,4,11]],"date-time":"2017-04-11T05:35:36Z","timestamp":1491888936000},"page":"155014771770265","update-policy":"http:\/\/dx.doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Extracting entity-based information in cyber-physical systems"],"prefix":"10.1177","volume":"13","author":[{"given":"Yuchen","family":"Yang","sequence":"first","affiliation":[{"name":"College of Computer Science and Technology, Harbin Engineering University, Harbin, P.R. 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