Table 3.

Comparison with the existing approaches for GENIA data set

System	Used approach	Domain knowledge/resources	FM
Our system	Classifier ensemble	POS, phrase	76.52
	(CRF and SVM)
Zhou & Su (2004) (GuoDong and Jian 2004) Final	HMM, SVM	Name alias, cascaded NEs dictionary, POS, phrase	72.55
Zhou & Su (2004) (GuoDong and Jian 2004)	HMM, SVM	POS, phrase	64.1
Kim et al. (2005) (Kim et al. 2005)	Two-phase model	POS, phrase,	71.19
	with ME and CRF	rule-based component
Finkel et. al (2004) (Finkel et al. 2004)	CRF	Gazetteers, web-querying, surrounding abstracts,	70.06
		abbreviation handling, BNC corpus, POS
Settles (2004) (Settles 2004)	ME	POS, semantic knowledge sources of 17 lexicons	70.00
Saha et al. (2009) (Saha et al. 2009)	ME	POS, phrase	67.41
Park et. al (2004) (Park et al. 2004)	ME	POS, phrase, domain-salient words using WSJ,	66.91
		morphological patterns, collocations from Medline
Song et al. (2004) (Song et al. 2004b) Final	SVM, CRF	POS, phrase, Virtual sample	66.28
Song et al. (2004) (Song et al. 2004b) Base	SVM	POS, phrase	63.85
Ponomareva et al. (2007) (Ponomareva et al. 2007)	HMM	POS	65.7