Query Processing
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Optimizing similarity queries in metric spaces meeting user\ s expectation / Otimização de operações de busca por similaridade em espaços métricos
The complexity of data stored in large databases has increased at very fast paces. Hence, operations more elaborated than traditional queries are essential in order to extract all required information from the database. Therefore, the interest of the database community in similarity search has increased significantly. Two of the well-known types of similarit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/10/2012
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2. Um Ambiente para Processamento de Consultas Federadas em Linked Data Mashups / An Environment for Federated Query Processing in Linked Data Mashups
Semantic Web technologies like RDF model, URIs and SPARQL query language, can reduce the complexity of data integration by making use of properly established and described links between sources.However, the difficulty to formulate distributed queries has been a challenge to harness the potential of these technologies due to autonomy, distribution and v
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/05/2012
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3. Exploiting contextual information for image re-ranking and rank aggregation in image retrieval tasks = : Explorando informações contextuais para reclassificação de imagens e agregação de listas em tarefas de recuperação de imagens / Explorando informações contextuais para reclassificação de imagens e agregação de listas em tarefas de recuperação de imagens
Content-Based Image Retrieval (CBIR) systems aims at meeting the user needs expressed in query specifications. Given a query pattern (e.g., query image) as input, a CBIR system retrieves the most similar images in a collection by taking into account image visual properties. Since users are interested in the images placed at the first positions of the returne
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2012
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4. Istar : um esquema estrela otimizado para Image Data Warehouses baseado em similaridade
A data warehousing environment supports the decision-making process through the investigation and analysis of data in an organized and agile way. However, the current data warehousing technologies do not allow that the decision-making processe be carried out based on images pictorial (intrinsic) features. This analysis can not be carried out in a conventiona
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2011
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5. Privacidade de localização geográfica em consultas a serviços públicos Web de localização: uma abordagem baseada em médias aleatórias
The increasing demand for Location-Based Services (LBSs) has increased the need for solutions that consider the privacy of queries in public LBSs. The currently proposed approaches rely mainly on the construction of an anonymizing spatial region (ASR) based on a rectangle containing a user consultant and at least other K−1 users, thereby setting a K le
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2010
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6. Optimizing query processing in cache-aware wireless sensor networks / Optimizing Query Processing in Cache-Aware Wireless Sensor Networks
A maioria dos modelos para Redes de Sensores sem Fio (RSSFs) assume a exis- tência de uma estação base onde os resultados de consultas poderiam em princípio ser armazenados em um cache. Apesar disso, a oportunidade de reutilizar tal cache para mi- nimizar o tráfego de dados na RSSF não tem sido bem explorada até o momento. Visando a preencher este esp
Publicado em: 2010
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7. The impact of spatial data redundancy on SOLAP query performance
Geographic Data Warehouses (GDW) are one of the main technologies used in decision-making processes and spatial analysis, and the literature proposes several conceptual and logical data models for GDW. However, little effort has been focused on studying how spatial data redundancy affects SOLAP (Spatial On-Line Analytical Processing) query performance over G
Journal of the Brazilian Computer Society. Publicado em: 2009-06
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8. Ontology based query processing for biodiversity systems / Processamento de consultas baseado em ontologias para sistemas de biodiversidade
Biodiversity information systems need and manage heterogeneous information provided by different research groups. Heterogeneity occur with respect to the species studied, the structure of the information gathered, the region of study, the work methodologies, or the vocabularies and objectives of the researchers, among other factors. This heterogeneity of dat
Publicado em: 2009
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9. Processamento de consultas em redes de sensores sem fio : uma abordagem de detecção de novidades para o controle da qualidade dos serviços de consultas / Processamento de Consultas em Redes de Sensores sem Fio: Uma Abordagem de Detecção de Novidades para o Controle da Qualidade dos Serviços das Consultas
Wireless Sensor Networks (WSNs) are communication networks composed of geographically distributed devices (sensor nodes) which can be used to monitor a variety of physical phenomena in real time. Due to the nature of these devices, WSNs have computational restrictions in terms of data processing and storage, and they are usually prone to failures. The main c
Publicado em: 2009
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10. Perseus:uma nova técnica para tratar árvores de sufixo persistentes / Perseus: a novel technique to handle persistent suffix trees
Due to the technological advances in molecular biology laboratories, biological databases are extremely voluminous and tend to become more voluminous as data on new genome organisms are available. This introduces the challenge of searching nucleotide sequences efficiently. The suffix tree is an access method used for several applications that search for thes
Publicado em: 2009
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11. Ontology-based clustering in a Peer Data Management System
Peer Data Management Systems (PDMS) are advanced P2P applications which enable users to transparently query several distributed, heterogeneous, and autonomous data sources. Each peer represents a data source and exports its entire data schema or only a portion of it. Such schema, named exported schema, represents the data to be shared with the other peers of
Publicado em: 2009
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12. Uma proposta de construção de índice invertido para recuperação de imagens baseada em conteúdo
This work shows an approach to construct an inverted index for Content-Based Image Retrieval. The objective is to speed up the process of querying without loss of quality in the result. To evaluate the effectiveness of the proposal, two systems for retrieval of images were developed. The first system was used as a basis for comparison. It uses techniques for
Publicado em: 2009