Results 1 - 10 of 330

Enabling Structured Queries over Unstructured Documents

by Fisnik Kastrati, Xiang Li, Christoph Quix, Mohammadreza Khelghati
"... Abstract—With the information explosion on the internet, finding precise answers efficiently is a prevalent requirement by many users. Today, search engines answer keyword queries with a ranked list of documents. Users might not be always willing to read the top ranked documents in order to satisfy ..."
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, on the other hand, the system must be able to extract information from unstructured text documents to answer these queries. To this end, we introduce a system which supports structured queries over unstructured text documents, aiming at finding structured answers to the users ’ information need. Our goal

Question Answering over Linked Data Using First-order Logic∗

by Shizhu He, Kang Liu, Yuanzhe Zhang, Liheng Xu, Jun Zhao
"... Question Answering over Linked Data (QALD) aims to evaluate a question an-swering system over structured data, the key objective of which is to translate questions posed using natural language into structured queries. This technique can help common users to directly ac-cess open-structured knowledge ..."
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Question Answering over Linked Data (QALD) aims to evaluate a question an-swering system over structured data, the key objective of which is to translate questions posed using natural language into structured queries. This technique can help common users to directly ac-cess open-structured

Query Evaluation with Constant Delay

by Thèse De Doctorat, Normale Supérieure, De Cachan, Présentée Par, Monsieur Wojciech Kazana, Docteur De, Supérieure De Cachan, Nicole Bidoit, Professeur Président, Arnaud Durand, Patrice Ossona, Mendez Chargé, Victor Vianu, Professeur Examinateur, Luc Segoufin, Directeur Recherche Directeur
"... I am grateful to Luc Segoufin who kindly accepted me to be his PhD student. He introduced me to the problem of query enumeration and encouraged me to look for the answers to all the questions that emerged during our collaboration. He was a truly great advisor, always supportive and available for dis ..."
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I am grateful to Luc Segoufin who kindly accepted me to be his PhD student. He introduced me to the problem of query enumeration and encouraged me to look for the answers to all the questions that emerged during our collaboration. He was a truly great advisor, always supportive and available

Entity-Relationship Queries over Wikipedia

by Xiaonan Li, Chengkai Li, Cong Yu
"... Wikipedia is the largest user-generated knowledge base. We propose a structured query mechanism, entity-relationship query, for searching entities in Wikipedia corpus by their properties and inter-relationships. An entity-relationship query consists of arbitrary number of predicates on desired entit ..."
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entities. The semantics of each predicate is specified with keywords. Entity-relationship query searches entities directly over text rather than pre-extracted structured data stores. This characteristic brings two benefits: (1) Query semantics can be intuitively expressed by keywords; (2) It avoids

Semantic question answering system over linked data using relational patterns

by Sherzod Hakimov, Hakan Tunc, Marlen Akimaliev, Erdogan Dogdu - In Proc. of the Joint EDBT/ICDT 2013 Workshops , 2013
"... Question answering is the task of answering questions in natural language. Linked Data project and Semantic Web community made it possible for us to query structured knowledge bases like DBpedia and YAGO. Only expert users, however, with the knowledge of RDF and ontology definitions can build correc ..."
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correct SPARQL queries for querying knowledge bases formally. In this paper, we present a method for mapping natural language questions to ontology-based structured queries to retrieve direct answers from open knowledge bases (linked data). Our tool is based on translating natural language questions

BayesWipe: A Multimodal System for Data Cleaning and Consistent Query Answering on Structured Data.”, Big Uncertain Data

by Sushovan De, Yuheng Hu, Yi Chen, Subbarao Kambhampati , 2014
"... Abstract—Recent efforts in data cleaning of structured data have focused exclusively on problems like data deduplication, record matching, and data standardization; none of these focus on fixing incorrect attribute values in tuples. Correcting values in tuples is typically performed by a minimum cos ..."
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statistical error model learned from the noisy database directly. We thus avoid the necessity for a domain expert or clean master data. We also show how to efficiently perform consistent query answering using this model over a dirty database, in case write permissions to the database are unavailable. We

Materials for an exploratory theory of the network society.

by Manuel Castells , Anthony Giddens , Alain Touraine , Anthony Smith , Benjamin Barber , Peter Hall , Roger-Pol Droit , Sophie Watson , Frank Webster , Krishan Kumar , David Lyon , Craig Calhoun , Jeffrey Henderson , Ramon Ramos , Jose E Rodrigues-Ibanez , Jose F Tezanos , Mary Kaldor , Stephen Jones , Christopher Freeman - The British Journal of Sociology , 2000
"... ABSTRACT This article aims at proposing some elements for a grounded theor y of the network society. The network society is the social structure characteristic of the Information Age, as tentatively identi ed by empirical, cross-cultural investigation. It permeates most societies in the world, in v ..."
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are socially and ecologically constrained, and, at the same time, biologically and culturally able of innovation. Meaning is produced, reproduced, and fought over in all layers of social structure, in production as in consumption, in experience as in power. What makes sense to anyone is de ned by the endless

Synthesizing structured text from logical database subsets. EDBT

by Alkis Simitsis , Georgia Koutrika , Yannis Alexandrakis , Yannis Ioannidis , 2008
"... ABSTRACT In the classical database world, information access has been based on a paradigm that involves structured, schema-aware, queries and tabular answers. In the current environment, however, where information prevails in most activities of society, serving people, applications, and devices in ..."
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to keyword queries. In this paper, we continue in the same direction and propose synthesizing textual answers in response to queries of any kind over structured data. In particular, we study the transformation of a dynamically-generated logical database subset into a narrative through a customizable

RANKED SEARCH OVER STRUCTURED AND SEMI-STRUCTURED DATA

by Lin Guo Ph. D , 2007
"... Traditionally, relational database systems have been designed for precise queries over structured data, while information retrieval systems have been designed for more flexible ranked keyword search queries over unstructured (text) data. How-ever, many new and emerging applications require data mana ..."
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Traditionally, relational database systems have been designed for precise queries over structured data, while information retrieval systems have been designed for more flexible ranked keyword search queries over unstructured (text) data. How-ever, many new and emerging applications require data

Object/relational query optimization with chase

by Lucian Popa
"... and backchase ..."
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and backchase
Results 1 - 10 of 330