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» Concept-based querying in mediator systems
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ICDE
2007
IEEE
164views Database» more  ICDE 2007»
14 years 1 months ago
Secure Mediation of Join Queries by Processing Ciphertexts
In a secure mediated information system, confidentiality is one of the main concerns when transmitting data from datasources to clients via a mediator. We present three approache...
Joachim Biskup, Christian Tsatedem, Lena Wiese
DASFAA
2004
IEEE
110views Database» more  DASFAA 2004»
13 years 11 months ago
Optimising Mediator Queries to Distributed Engineering Systems
Data and computations of a CAD system have been wrapped by a mediator system using CORBA's IIOP Protocol. This allows ad hoc declarative mediator queries to be translated into...
Mattias Nyström, Tore Risch
DPD
2002
114views more  DPD 2002»
13 years 7 months ago
Query Decomposition for a Distributed Object-Oriented Mediator System
The mediator-wrapper approach to integrate data from heterogeneous data sources has usually been centralized in the sense that a single mediator system is placed between a number o...
Vanja Josifovski, Tore Risch
IAJIT
2010
133views more  IAJIT 2010»
13 years 6 months ago
Mediation Queries Adaptation After the Removal of a Data Source
: A broad variety of data is available in distinct heterogeneous sources, stored under different formats: database formats (in relational and object-oriented models), document form...
Latifa Baba-hamed
ICDT
1999
ACM
97views Database» more  ICDT 1999»
13 years 11 months ago
Optimizing Large Join Queries in Mediation Systems
In data integration systems, queries posed to a mediator need to be translated into a sequence of queries to the underlying data sources. In a heterogeneous environment, with sour...
Ramana Yerneni, Chen Li, Jeffrey D. Ullman, Hector...