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New Technology of Library and Information Service  2016, Vol. 32 Issue (10): 91-97    DOI: 10.11925/infotech.1003-3513.2016.10.10
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Extracting Chemical and Disease Named Entities with Multiple-Feature CRF Model
Sui Mingshuang,Cui Lei()
School of Medical Informatics, China Medical University, Shenyang 110122, China
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Abstract  

[Objective] This study aims to build a CRF model with multiple features, which could automatically extract chemical and disease named entities from biomedical documents. [Methods] We compared the performance of popular named entity recognition features, including lexical features, domain knowledge features, dictionary matching features as well as unsupervised learning features, and then optimized the new model. [Results] We built the final CRF model with lexical features, dictionary matching features, unsupervised learning features and part of the domain knowledge features. The precision, recall, and F-score for chemical entities identification tasks were 97.33%, 80.76%, and 88.27, respectively. For disease entities, they were 84.20%, 81.96%, and 83.07%, respectively. [Limitations] Chemical and disease entities may interfere with each other while being identified simultaneously. The deleted domain knowledge features may contain valuable information. [Conclusions] This study proposed a new method to identify biomedical named entities, which could be further improved.

Key wordsNamed entity recognition      CRF      Text mining      Unsupervised learning     
Received: 24 June 2016      Published: 23 November 2016

Cite this article:

Sui Mingshuang,Cui Lei. Extracting Chemical and Disease Named Entities with Multiple-Feature CRF Model. New Technology of Library and Information Service, 2016, 32(10): 91-97.

URL:

http://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/10.11925/infotech.1003-3513.2016.10.10     OR     http://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/Y2016/V32/I10/91

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