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ACMSE
2007
ACM
14 years 5 days ago
Hierarchical land cover information retrieval in object-oriented remote sensing image databases with native queries
Classification and change detection of land cover types in the remotely sensed images is one of the major applications in remote sensing. This paper presents a hierarchical framew...
Jiang Li
SWAP
2007
13 years 9 months ago
Some Experiments on the Usage of a Deductive Database for RDFS Querying and Reasoning
Abstract. Ontologies are pervading many areas of knowledge representation and management. To date, most research efforts have been spent on the development of sufficiently express...
Giovambattista Ianni, Alessandra Martello, Claudio...
PODS
2004
ACM
139views Database» more  PODS 2004»
14 years 8 months ago
On Preservation under Homomorphisms and Unions of Conjunctive Queries
Unions of conjunctive queries, also known as select-project-join-union queries, are the most frequently asked queries in relational database systems. These queries are definable b...
Albert Atserias, Anuj Dawar, Phokion G. Kolaitis
LREC
2010
161views Education» more  LREC 2010»
13 years 9 months ago
Providing Multilingual, Multimodal Answers to Lexical Database Queries
Language users are increasingly turning to electronic resources to address their lexical information needs, due to their convenience and their ability to simultaneously capture di...
Gerard de Melo, Gerhard Weikum
PODS
1995
ACM
139views Database» more  PODS 1995»
13 years 11 months ago
Normalizing Incomplete Databases
Databases are often incomplete because of the presence of disjunctive information, due to con icts, partial knowledge and other reasons. Queries against such databases often ask q...
Leonid Libkin