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This paper presents a novel opinion mining research problem, which is called Contrastive Opinion Modeling (COM). Given any query topic and a set of text collections from multiple perspectives, the task of COM is to present the opinions of the individual perspectives on the topic, and furthermore to quantify their difference. This general problem subsumes(More)
This paper gives an overview of our work done for the TREC 2009 Entity track. We propose a hierarchical relevance retrieval model for entity ranking. In this model, three levels of relevance are examined which are document, passage and entity, respectively. The final ranking score is a linear combination of the relevance scores from the three levels.(More)
—Expressing knowledge by ontology is favorable for reuse and reasoning of knowledge. The structure of domain ontology for question answering system (QA) was formally defined, and the relations between ontology elements and semantic analysis of question and answer extraction were illustrated. The method of reusing Chinese ontology was proposed in the same(More)
This paper gives an overview of our work for the TREC 2010 Entity track. The goal of the TREC Entity track is to study entity-related searches on Web data, which has not been sufficiently addressed in prior research. For both the Related Entity Finding (REF) task and the Entity List Completion (ELC) task in this track, we propose a unified probabilistic(More)
Word sense disambiguation has always been a key problem in Natural Language Processing. In the paper, we use the method of Information Gain to calculate the weight of different position's context, which affect to ambiguous words. And take this as the foundation. We select the ahead and back six position's context of ambiguous words to construct the feature(More)
This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Abstract—In a heterogeneous Wireless Sensor Network (WSN), factors such as initial energy, data processing capability, etc. greatly influence the network lifespan. Despite the success of various(More)