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Frontiers of Computer Science

ISSN 2095-2228

ISSN 2095-2236(Online)

CN 10-1014/TP

Postal Subscription Code 80-970

2018 Impact Factor: 1.129

Front Comput Sci Chin    2011, Vol. 5 Issue (4) : 405-418    https://doi.org/10.1007/s11704-011-1031-9
RESEARCH ARTICLE
Answering contextual questions based on ontologies and question templates
Dongsheng WANG1,2,3()
1. Key Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China; 3. Department of Computer Science, Jiangsu University of Science and Technology, Zhenjiang 212003, China
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Abstract

Contextual question answering (CQA), in which user information needs are satisfied through an interactive question answering (QA) dialog, has recently attracted more research attention. One challenge is to fuse contextual information into the understanding process of relevant questions. In this paper, a discourse structure is proposed to maintain semantic information, and approaches for recognition of relevancy type and fusion of contextual information according to relevancy type are proposed. The system is evaluated on real contextual QA data. The results show that better performance is achieved than a baseline system and almost the same performance as when these contextual phenomena are resolved manually. A detailed evaluation analysis is presented.

Keywords Contextual question answering (CQA)      ontology      question templates     
Corresponding Author(s): WANG Dongsheng,Email:wds_ict@163.com   
Issue Date: 05 December 2011
 Cite this article:   
Dongsheng WANG. Answering contextual questions based on ontologies and question templates[J]. Front Comput Sci Chin, 2011, 5(4): 405-418.
 URL:  
https://academic.hep.com.cn/fcs/EN/10.1007/s11704-011-1031-9
https://academic.hep.com.cn/fcs/EN/Y2011/V5/I4/405
Fig.1  Part of the domain ontology of BSC domain
Fig.2  Part of problem ontology
Fig.3  Definition of question template
Fig.4  Relationship between question template and conceptual model
Fig.5  Pseudo-code of QTM algorithm.
Discourse structurestate
userIDuser1
target conceptNH credit card
topicIntroduction
query focusCharacteristic
Tab.1  Example discourse structure of user1’s question
Fig.6  Pseudo-code of RTR algorithm.
Fig.7  Pseudo-code of CIF algorithm.
Fig.8  Relations between number of question template and accuracy as well as recognition rate
Fig.9  Relations between number of services and accuracy as well as recognition rate
IndexReRe/IRe(Re/IRe)×D(Re/IRe) ×D×HAccu
Accuracy75.2%79.1%81.80%82.41%
Tab.2  Four characteristics adding orderly to the formula
Metric\systemAll seriesTarget concept shiftIn-Topic focus refinementFocus shift
Baseline0.5490.620.510.52
Proposed system0. 8840.910.810.92
Manually resolved0. 9330.920.940.94
Tab.3  Evaluation of contextual question answering (accuracy)
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