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Indexed by:期刊论文

Date of Publication:2013-07-01

Journal:IEEE-ACM TRANSACTIONS ON COMPUTATIONAL BIOLOGY AND BIOINFORMATICS

Included Journals:SCIE、EI、PubMed、Scopus

Volume:10

Issue:4

Page Number:897-904

ISSN No.:1545-5963

Key Words:Named entity recognition and classification; two-layer stacking method; multiagent; bioinformatics

Abstract:Biomedical named entity recognition (Bio-NER) is a fundamental step in biomedical text mining. This paper presents a two-phase Bio-NER model targeting at JNLPBA task. Our two-phase method divides the task into two subtasks: named entity detection (NED) and named entity classification (NEC). The NED subtask is accomplished based on the two-layer stacking method in the first phase, where named entities (NEs) are distinguished from nonnamed-entities (NNEs) in biomedical literatures without identifying their types. Then six classifiers are constructed by four toolkits (CRF++, YamCha, maximum entropy, Mallet) with different training methods and integrated based on the two-layer stacking method. In the second phase for the NEC subtask, the multiagent strategy is introduced to determine the correct entity type for entities identified in the first phase. The experiment results show that the presented approach can achieve an F-score of 76.06 percent, which outperforms most of the state-of-the-art systems.