Jakub Lokoč, Ph.D.

Research groups

Siret

Research topics

• similarity search in unstructured data
• metric and nonmetric indexing
• content based retrieval
• multimedia databases

Teachingtop

Supervised thesestop

Research grantstop

• Distributed and Parallel Metric Indexing in Multimedia Databases (GAUK 18208) 2008-2010 head investigator
• Similarity Searching in Very Large Multimedia Databases (GACR 201/09/0683) 2009-2011 cooperant
• Modern methods and applications of software engineering (GAUK SVV-2010-261312) 2010-2010 cooperant

Publicationstop

2012

Refereed (journals/proceedings) (9)

• Kruliš M., Skopal T., Lokoč J., Beecks C.: Combining CPU and GPU architectures for fast similarity search, in DISTRIBUTED AND PARALLEL DATABASES, Vol. 30, Num. 3-4, ISSN: 0926-8782, pp. 179-207, 2012
• Lokoč J., David N., Michal B., Skopal T.: Visual Image Search: Feature Signatures or/and Global Descriptors, in Lecture Notes in Computer Science, Vol. 2012, Num. 7404, ISSN: 0302-9743, pp. 177-191, 2012
• Lokoč J., Přemysl Č., Novák J., Skopal T.: Cut-region: A Compact Building Block For Hierarchical Metric Indexing, in Lecture Notes in Computer Science, Vol. 2012, Num. 7404, ISSN: 0302-9743, pp. 85-100, 2012
• Lokoč J., Skopal T., Christian B., Thomas S.: Similarity Search by Earth Movers Distance using Nonmetric Ground Distances, in MMEDIA 2012, The Fourth International Conferences on Advances in Multimedia, Chamonix, XPS, ISBN: 978-1-61208-195-3, pp. 50-55, 2012
• Lokoč J., Tomáš G., Skopal T.: Image Exploration using Online Feature Extraction and Reranking, in ICMR '12 Proceedings of the 2nd ACM International Conference on Multimedia Retrieval, Hongkong, China, ACM, ISBN: 978-1-4503-1329-2, pp. 1-2, 2012
• Lokoč J., Tomáš G., Skopal T.: SIR: The Smart Image Retrieval Engine, in Lecture Notes in Computer Science, Vol. 2012, Num. 7404, ISSN: 0302-9743, pp. 240-241, 2012
• Novák J., Hoksza D., Lokoč J., Skopal T.: On Optimizing the Non-metric Similarity Search in Tandem Mass Spectra by Clustering, in Lecture Notes in Computer Science, Vol. 2012, Num. 7292, ISSN: 0302-9743, pp. 189-200, 2012
• Novák J., Skopal T., Hoksza D., Lokoč J.: Non-metric Similarity Search of Tandem Mass Spectra Including Posttranslational Modifications, in Journal of Discrete Algorithms, Vol. 2012, Num. 13, ISSN: 1570-8667, pp. 19-31, 2012 - On-line verze
• Skopal T., Lokoč J., Bustos B.: D-cache: Universal Distance Cache for Metric Access Methods, in IEEE Transactions on Knowledge and Data Engineering, ISSN: 1041-4347, 2012

2011

Refereed (journals/proceedings) (7)

• Beecks C., Lokoč J., Seidl T., Skopal T.: Indexing the Signature Quadratic Form Distance for Efficient Content-Based Multimedia Retrieval, in Proceedings of the 1st ACM International Conference on Multimedia Retrieval, Trento, Italy, ACM, ISBN: 978-1-4503-0336-1, pp. 1-8, 2011
• Kruliš M., Lokoč J., Beecks C., Skopal T., Seidl T.: Processing the Signature Quadratic Form Distance on Many-Core GPU Architectures, in Compilation Proceedings of CIKM 2011 and the co-located Workshops, Glasgow, ACM, ISBN: 978-1-4503-0717-8, pp. 2373-2376, 2011
• Lokoč J., Beecks C., Seidl T., Skopal T.: Parameterized Earth Mover's Distance for Efficient Metric Space Indexing, in Fourth International Conference on Similarity Search and Applications 2011, Lipari, Italy, ACM, ISBN: 978-1-4503-0795-6, pp. 121-122, 2011
• Lokoč J., Hetland M., Skopal T., Beecks C.: Ptolemaic Indexing of the Signature Quadratic Form Distance, in Fourth International Conference on Similarity Search and Applications 2011, Lipari, Italy, ACM, ISBN: 978-1-4503-0795-6, pp. 9-16, 2011
• Moško J., Lokoč J., Skopal T.: Clustered Pivot Tables for I/O-optimized Similarity Search, in Fourth International Conference on Similarity Search and Applications 2011, Lipari, Italy, ACM, ISBN: 978-1-4503-0795-6, pp. 17-24, 2011
• Novák J., Skopal T., Hoksza D., Lokoč J., Galgonek J.: Protein Sequences Identification using NM-tree, in Fourth International Conference on Similarity Search and Applications 2011, Lipari, Italy, ACM, ISBN: 978-1-4503-0795-6, pp. 125-126, 2011 - On-line verze
• Skopal T., Bartoš T., Lokoč J.: On (not) indexing quadratic form distance by metric access methods, in Proceedings of the 14th International Conference on Extending Database Technology, Hannover, Germany, ACM, ISBN: 978-1-4503-0528-0, pp. 249-258, 2011

2010

Refereed (journals/proceedings) (3)

• Lokoč J., Skopal T.: On Applications of Parameterized Hyperplane Partitioning, in Third International Conference on Similarity Search and Applications, Istanbul, Turkey, ACM, ISBN: 978-1-4503-0420-7, pp. 131-132, 2010 - WWW
• Novák J., Skopal T., Hoksza D., Lokoč J.: Improving the Similarity Search of Tandem Mass Spectra using Metric Access Methods, in Third International Conference on Similarity Search and Applications, Istanbul, Turkey, ACM, ISBN: 978-1-4503-0420-7, pp. 85-92, 2010 - On-line PDF verze
• Skopal T., Lokoč J.: Answering Metric Skyline Queries by PM-tree, in Proceedings of the Dateso 2010 Annual International Workshop on DAtabases, TExts, Specifications and Objects, Stedronin-Plazy, Czech Republic, MATFYZPRESS, ISBN: 978-80-7378-116-3, ISSN: 1613-0073, pp. 22-37, 2010

2009

Refereed (journals/proceedings) (1)

• Lokoč J.: Parallel Dynamic Batch Loading in the M-tree, in SISAP 2009: Second international workshop on similarity search and applications, Prague, Czech Republic, IEEE, ISBN: 978-0-7695-3765-8, pp. 117-123, August 2009

Technical reports (1)

• Skopal T., Lokoč J.: Efficient Metric Skyline Processing using the PM-tree, technical report no. 2009/1, MFF UK, 10 pages, 2009

2008

Refereed (journals/proceedings) (4)

• Lokoč J.: On M-tree Variants in Metric and Non-metric Spaces, in WDS'08 Proceedings of Contributed Papers: Part I - Mathematics and Computer Sciences , Matfyzpress, ISBN: 978-80-7378-065-4, pp. 230-234, June 2008
• Lokoč J., Skopal T.: On Reinsertions in M-tree, in 2008 IEEE 24th international conference on data engineering workshop, vols 1 and 2, ISBN: 978-1-4244-2162-6, pp. 570-577, 2008
• Lokoč J., Skopal T.: On Reinsertions in Mtree, in SISAP 2008: First international workshop on similarity search and applications, Cancun, Mexico, IEEE, ISBN: 0-7695-3101-6, pp. 121-128, April 2008
• Skopal T., Lokoč J.: NM-tree: Flexible Approximate Similarity Search in Metric and Non-metric Spaces, in 19th International Conference on Database and Expert Systems Applications, ISBN: 978-3-540-85653-5, ISSN: 0302-9743, pp. 312-325, 2008

Contactstop

• lokoc<at>ksi.mff.cuni.cz
• http://siret.ms.mff.cuni.cz/lokoc/
• room 209, 2nd floor
• +420 221 914 227