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This book constitutes the refereed proceedings of the 23rd China Conference on Information Retrieval, CCIR 2017, held in Shanghai, China, in July 2017. The 21 full papers presented were carefully reviewed and selected from 41 submissions. The papers are organized in topical sections: recommendation; understanding users; NLP for IR; IR and applications; query processing and analysis.

Computer science. --- Database management. --- Data mining. --- Information storage and retrieval. --- Multimedia information systems. --- Computational linguistics. --- Application software. --- Computer Science. --- Information Storage and Retrieval. --- Database Management. --- Data Mining and Knowledge Discovery. --- Multimedia Information Systems. --- Language Translation and Linguistics. --- Computer Appl. in Social and Behavioral Sciences. --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Automatic language processing --- Language and languages --- Language data processing --- Linguistics --- Natural language processing (Linguistics) --- Computer-based multimedia information systems --- Multimedia computing --- Multimedia information systems --- Multimedia knowledge systems --- Algorithmic knowledge discovery --- Factual data analysis --- KDD (Information retrieval) --- Knowledge discovery in data --- Knowledge discovery in databases --- Mining, Data --- Data base management --- Data services (Database management) --- Database management services --- DBMS (Computer science) --- Generalized data management systems --- Services, Database management --- Systems, Database management --- Systems, Generalized database management --- Informatics --- Data processing --- Computer software --- Applied linguistics --- Cross-language information retrieval --- Mathematical linguistics --- Multilingual computing --- Information storage and retrieval systems --- Database searching --- Electronic data processing --- Science --- Information storage and retrieva. --- Multimedia systems. --- Natural language processing (Computer science). --- Social sciences --- Natural Language Processing (NLP). --- Data processing. --- NLP (Computer science) --- Artificial intelligence --- Human-computer interaction --- Semantic computing --- Information storage and retrieval systems. --- Automatic data storage --- Automatic information retrieval --- Automation in documentation --- Computer-based information systems --- Data processing systems --- Data storage and retrieval systems --- Discovery systems, Information --- Information discovery systems --- Information processing systems --- Information retrieval systems --- Machine data storage and retrieval --- Mechanized information storage and retrieval systems --- Computer systems --- Electronic information resources --- Data libraries --- Digital libraries --- Information organization --- Information retrieval --- Social sciences—Data processing. --- Computer Application in Social and Behavioral Sciences. --- Data centers

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This book constitutes the refereed proceedings of the 14th International Conference on NII Testbeds and Community for Information Access Research, NTCIR 2019, held in Tokyo, Japan, in June 2019. The 15 full papers presented in this book were carefully reviewed and selected from 55 submissions. This NTCIR 2019 proceedings was structured in the following topics: lifelog search; open live test for question retrieval; QA lab for political information; short text conversation; we want web; and fine-grained numeral understanding in financial tweet.

Information retrieval --- Information science --- Application software. --- Information storage and retrieval. --- User interfaces (Computer systems). --- Database management. --- Machine learning. --- Information Systems Applications (incl. Internet). --- Information Storage and Retrieval. --- User Interfaces and Human Computer Interaction. --- Computer Appl. in Social and Behavioral Sciences. --- Database Management. --- Machine Learning. --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Computer software --- Learning, Machine --- Artificial intelligence --- Machine theory --- Data base management --- Data services (Database management) --- Database management services --- DBMS (Computer science) --- Generalized data management systems --- Services, Database management --- Systems, Database management --- Systems, Generalized database management --- Electronic data processing --- Interfaces, User (Computer systems) --- Human-machine systems --- Human-computer interaction

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Information retrieval --- Computer science --- Information systems --- Artificial intelligence. Robotics. Simulation. Graphics --- Computer. Automation