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Displaying 1-12 out of 12 total
k-Anonymity in the Presence of External Databases
Found in: IEEE Transactions on Knowledge and Data Engineering
By Dimitris Sacharidis, Kyriakos Mouratidis, Dimitris Papadias
Issue Date:March 2010
pp. 392-403
The concept of k-anonymity has received considerable attention due to the need of several organizations to release microdata without revealing the identity of individuals. Although all previous k-anonymity techniques assume the existence of a public databa...
 
Topologically Sorted Skylines for Partially Ordered Domains
Found in: Data Engineering, International Conference on
By Dimitris Sacharidis, Stavros Papadopoulos, Dimitris Papadias
Issue Date:April 2009
pp. 1072-1083
The vast majority of work on skyline queries considers totally ordered domains, whereas in many applications some attributes are partially ordered, as for instance, domains of set values, hierarchies, intervals and preferences. The only work addressing thi...
 
Evaluating Path Queries over Frequently Updated Route Collections
Found in: IEEE Transactions on Knowledge and Data Engineering
By Panagiotis Bouros,Dimitris Sacharidis,Theodore Dalamagas,Spiros Skiadopoulos,Timos Sellis
Issue Date:July 2012
pp. 1276-1290
The recent advances in the infrastructure of Geographic Information Systems (GIS), and the proliferation of GPS technology, have resulted in the abundance of geodata in the form of sequences of points of interest (POIs), waypoints, etc. We refer to sets of...
 
Ranking and Clustering Web Services Using Multicriteria Dominance Relationships
Found in: IEEE Transactions on Services Computing
By Dimitrios Skoutas, Dimitris Sacharidis, Alkis Simitsis, Timos Sellis
Issue Date:July 2010
pp. 163-177
As the web is increasingly used not only to find answers to specific information needs but also to carry out various tasks, enhancing the capabilities of current web search engines with effective and efficient techniques for web service retrieval and selec...
 
Probabilistic contextual skylines
Found in: Data Engineering, International Conference on
By Dimitris Sacharidis, Anastasios Arvanitis, Timos Sellis
Issue Date:March 2010
pp. 273-284
The skyline query returns the most interesting tuples according to a set of explicitly defined preferences among attribute values. This work relaxes this requirement, and allows users to pose meaningful skyline queries without stating their choices. To com...
 
Serving the Sky: Discovering and Selecting Semantic Web Services through Dynamic Skyline Queries
Found in: International Conference on Semantic Computing
By Dimitrios Skoutas, Dimitris Sacharidis, Alkis Simitsis, Timos Sellis
Issue Date:August 2008
pp. 222-229
Semantic Web service descriptions are typically multi-parameter constructs. Discovering semantically relevant services given a desirable service description is typically addressed by performing a pairwise, logic-based match between the requested and offere...
 
Diachronic linked data: towards long-term preservation of structured interrelated information
Found in: Proceedings of the First International Workshop on Open Data (WOD '12)
By Dimitris Kotzinos, Dimitris Sacharidis, François Bancilhon, George Papastefanatos, Giorgos Flouris, Helen Parkinson, Kostas Thiveos, Peter Buneman, Sören Auer, Theodore Dalamagas, Vassilis Christophides, Yannis Stavrakas
Issue Date:May 2012
pp. 31-39
The Linked Data Paradigm is a promising technology for publishing, sharing, and connecting data on the Web, which provides new perspectives for data integration and interoperability. However, the proliferation of distributed, interconnected linked data sou...
     
On enhancing scalability for distributed RDF/S stores
Found in: Proceedings of the 14th International Conference on Extending Database Technology (EDBT/ICDT '11)
By Dimitris Sacharidis, George Tsatsanifos, Timos Sellis
Issue Date:March 2011
pp. 141-152
This work presents MIDAS-RDF, a distributed P2P RDF/S repository that is built on top of a distributed multi-dimensional index structure. MIDAS-RDF features fast retrieval of RDF triples satisfying various pattern queries by translating them into multi-dim...
     
Top-k dominant web services under multi-criteria matching
Found in: Proceedings of the 12th International Conference on Extending Database Technology: Advances in Database Technology (EDBT '09)
By Alkis Simitsis, Dimitrios Skoutas, Dimitris Sacharidis, Timos Sellis, Verena Kantere
Issue Date:March 2009
pp. 94-104
As we move from a Web of data to a Web of services, enhancing the capabilities of the current Web search engines with effective and efficient techniques for Web services retrieval and selection becomes an important issue. Traditionally, the relevance of a ...
     
On-line discovery of hot motion paths
Found in: Proceedings of the 11th international conference on Extending database technology: Advances in database technology (EDBT '08)
By Dimitris Sacharidis, Kostas Patroumpas, Kyriakos Mouratidis, Manolis Terrovitis, Michalis Potamias, Timos Sellis, Verena Kantere
Issue Date:March 2008
pp. 1-3
We consider an environment of numerous moving objects, equipped with location-sensing devices and capable of communicating with a central coordinator. In this setting, we investigate the problem of maintaining hot motion paths, i.e., routes frequently foll...
     
Exploiting duality in summarization with deterministic guarantees
Found in: Proceedings of the 13th ACM SIGKDD international conference on Knowledge discovery and data mining (KDD '07)
By Dimitris Sacharidis, Nikos Mamoulis, Panagiotis Karras
Issue Date:August 2007
pp. 380-389
Summarization is an important task in data mining. A major challenge over the past years has been the efficient construction of fixed-space synopses that provide a deterministic quality guarantee, often expressed in terms of a maximum-error metric. Histogr...
     
SHIFT-SPLIT: I/O efficient maintenance of wavelet-transformed multidimensional data
Found in: Proceedings of the 2005 ACM SIGMOD international conference on Management of data (SIGMOD '05)
By Cyrus Shahabi, Dimitris Sacharidis, Mehrdad Jahangiri
Issue Date:June 2005
pp. 275-286
The Discrete Wavelet Transform is a proven tool for a wide range of database applications. However, despite broad acceptance, some of its properties have not been fully explored and thus not exploited, particularly for two common forms of multidimensional ...
     
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