A New Biomedical Passage Retrieval Framework for Laboratory Medicine: Leveraging Domain-specific Ontology, Multilevel PRF, and Negation Differential Weighting

Table 5

Retrieval features used by compared retrieval models.

	Concept detection		Query expansion			Ranking function
	NLP	Domain ontology	Synonym	Local	Global	TF-IDF	BM25	LM	Neg
Baseline	x	—	x	—	—	x	x	x	—
UMLSE	x	x	x	—	—	x	x	x	—
LPRF	x	x	x	x	—	x	x	x	—
GPRF	x	x	x	x	x	x	x	x	—
GPRF-NEG	x	x	x	x	x	x	x	x	x