Negation operation is important in intelligent information processing. Different existing arithmetic negation, an exponential negation presented this paper. The new can be seen as a kind of geometry negation. Some basic properties the proposed are investigated, and we find that fix point uniform probability distribution, which reaches maximum entropy. entropy increase operation, all distributio...

Constructive negation derives constraint answers for non-ground negative literals. Its incorporation into query evaluation under the well-founded semantics introduces two problems. One is the detection of repeated sub-goals and the elimination of redundant answers, which is required in order to guarantee termination. The other is the interaction between constraint answers of non-ground negative...

We explore a rule-based methodology for the BioNLP’09 Shared Task on Event Extraction, using dependency parsing as the underlying principle for extracting and characterizing events. We approach the speculation and negation detection task with the same principle. Evaluation results demonstrate the utility of this syntax-based approach and point out some shortcomings that need to be addressed in ...