S. V. Ramanan

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We tested a linguistically motivated rulebased system in the Cancer Genetics task of the BioNLP13 shared task challenge. The performance of the system was very moderate, ranging from 52% against the development set to 45% against the test set. Interestingly, the performance of the system did not change appreciably when using only entities tagged by the(More)
The automatic extraction of chemical information from text requires the recognition of chemical entity mentions as one of its key steps. When developing supervised named entity recognition (NER) systems, the availability of a large, manually annotated text corpus is desirable. Furthermore, large corpora permit the robust evaluation and comparison of(More)
We extended Cocoa/Peaberry, our (RelAgent) existing rule based entity and event tagger, to tag attributes associated with diseases in clinical records. The boolean attributes of Negation, Uncertainty and Conditional were handled by an extension of the NegEx algorithm. The multi-valued Course and Severity attributes were detected either within the extended(More)
We refined the performance of Cocoa/Peaberry, a linguistically motivated system, on extracting disease entities from clinical notes in the training and development sets for Task 7. Entities were identified in noun chunks by use of dictionaries, and events (‘The left atrium is dilated’) through our own parser and predicate-argument structures. We also(More)
We tested the performance of Cocoa, an existing dictionary/rule based entity tagger that tags multiple semantic types in biomedical domain including diseases, on disease/sign/symptom detection in clinical records in the ShARe/CLEF eHealth task. Initial analysis showed that the precision was high (≥ 90%), but recall was low (≈ 50%) due to (a) phrases(More)
A patient with acute lymphocytic leukemia developed acute pancreatitis during induction therapy with corticosteroids and asparaginase. Postmortem examination showed changes consistent with hemorrhagic pancreatitis and fat necrosis over the pancreas and omentum. Corticosteroids were thought to be responsible for pancreatitis in this patient since(More)