Biomedical named entity recognition using two-phase model based on SVMs. Export

@article{citeulike:883328, abstract = {Named entity (NE) recognition has become one of the most fundamental tasks in biomedical knowledge acquisition. In this paper, we present a two-phase named entity recognizer based on SVMs, which consists of a boundary identification phase and a semantic classification phase of named entities. When adapting SVMs to named entity recognition, the multi-class problem and the unbalanced class distribution problem become very serious in terms of training cost and performance. We try to solve these problems by separating the NE recognition task into two subtasks, where we use appropriate SVM classifiers and relevant features for each subtask. In addition, by employing a hierarchical classification method based on ontology, we effectively solve the multi-class problem concerning semantic classification. The experimental results on the GENIA corpus show that the proposed method is effective not only in reducing computational cost but also in improving performance. The F-score (beta=1) for the boundary identification is 74.8 and the F-score for the semantic classification is 66.7.}, address = {Natural Language Processing Laboratory, Department of Computer Science and Engineering, Korea University, 1, 5-ka, Anam-dong, Seoul 136-701, Republic of Korea. kjlee@nlp.korea.ac.kr}, author = {Lee, K. J. and Hwang, Y. S. and Kim, S. and Rim, H. C.}, citeulike-article-id = {883328}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.jbi.2004.08.012}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/15542017}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=15542017}, citeulike-linkout-3 = {http://www.sciencedirect.com/science/article/B6WHD-4DS93BW-3/2/1d7e1406650a5b4accd0bb51fb0e1e88}, doi = {10.1016/j.jbi.2004.08.012}, issn = {1532-0464}, journal = {J Biomed Inform}, keywords = {ner}, month = {December}, number = {6}, pages = {436--447}, posted-at = {2006-10-04 04:41:34}, priority = {2}, title = {Biomedical named entity recognition using two-phase model based on SVMs.}, url = {http://dx.doi.org/10.1016/j.jbi.2004.08.012}, volume = {37}, year = {2004} }

TY - JOUR ID - citeulike:883328 L3 - citeulike-article-id:883328 N2 - Named entity (NE) recognition has become one of the most fundamental tasks in biomedical knowledge acquisition. In this paper, we present a two-phase named entity recognizer based on SVMs, which consists of a boundary identification phase and a semantic classification phase of named entities. When adapting SVMs to named entity recognition, the multi-class problem and the unbalanced class distribution problem become very serious in terms of training cost and performance. We try to solve these problems by separating the NE recognition task into two subtasks, where we use appropriate SVM classifiers and relevant features for each subtask. In addition, by employing a hierarchical classification method based on ontology, we effectively solve the multi-class problem concerning semantic classification. The experimental results on the GENIA corpus show that the proposed method is effective not only in reducing computational cost but also in improving performance. The F-score (beta=1) for the boundary identification is 74.8 and the F-score for the semantic classification is 66.7. IS - 6 JF - J Biomed Inform SN - 1532-0464 AD - Natural Language Processing Laboratory, Department of Computer Science and Engineering, Korea University, 1, 5-ka, Anam-dong, Seoul 136-701, Republic of Korea. kjlee@nlp.korea.ac.kr EP - 447 TI - Biomedical named entity recognition using two-phase model based on SVMs. VL - 37 SP - 436 KW - ner AU - Lee, KJ AU - Hwang, YS AU - Kim, S AU - Rim, HC PY - 2004/12// UR - http://dx.doi.org/10.1016/j.jbi.2004.08.012 ER -