Photo of Christian Thomsen
  • Selma Lagerløfs Vej 300, 3-2-32

    9220 Aalborg Ø

    Denmark

  • Selma Lagerlöfs Vej 300

    9220 Aalborg Ø

    Denmark

20042023
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Research Output 2005 2019

2019

Demonstration of ModelarDB: Model-Based Management of Dimensional Time Series

Jensen, S. K., Pedersen, T. B. & Thomsen, C., 2019, Proceedings of the 2019 International Conference on Management of Data. Association for Computing Machinery, p. 1933-1936 4 p. (Proceedings of the ACM SIGMOD International Conference on Management of Data).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Time series
Demonstrations
Sensors
28 Downloads (Pure)

Efficient indexing of hashtags using bitmap indices

Subba, L. T., Thomsen, C. & Pedersen, T. B., 20 Mar 2019, In : CEUR Workshop Proceedings. 2324, 10 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

File
Data warehouses
2018
1 Citation (Scopus)

Analytical metadata modeling for next generation BI systems

Varga, J., Romero, O., Pedersen, T. B. & Thomsen, C., 1 Oct 2018, In : Journal of Systems and Software. 144, p. 240 - 254 15 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Competitive intelligence
Metadata
Data structures
Decision making
Semantics

ETL

Thomsen, C., 6 May 2018, Encyclopedia of Big Data Technologies. Sakr, S. & Zomaya, A. (eds.). Springer Publishing Company, 5 p.

Research output: Contribution to book/anthology/report/conference proceedingEncyclopedia chapterResearchpeer-review

Open Access
Mathematical transformations
3 Citations (Scopus)

ModelarDB: Modular Model-based Time Series Management with Spark and Cassandra

Jensen, S. K., Pedersen, T. B. & Thomsen, C., 1 Jul 2018, In : Proceedings of the VLDB Endowment. 11, 11, p. 1688-1701 14 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
Electric sparks
Time series
Query processing
Sensors
Wind turbines
2 Downloads (Pure)

Programmatic ETL

Thomsen, C., Andersen, O., Jensen, S. K. & Pedersen, T. B., 2018, Business Intelligence and Big Data - 7th European Summer School, eBISS 2017, Tutorial Lectures. Zimányi, E. (ed.). Cham: Springer Publishing Company, p. 21-50 30 p. (Lecture Notes in Business Information Processing, Vol. 324).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Mathematical transformations
Data warehouses
Graphical user interfaces
1 Citation (Scopus)
10 Downloads (Pure)

SimpleETL: ETL Processing by Simple Specifications

Andersen, O., Thomsen, C. & Torp, K., 1 Jan 2018, Proceedings of the 20th International Workshop on Design, Optimization, Languages and Analytical Processing of Big Data co-located with 10th EDBT/ICDT Joint Conference. CEUR Workshop Proceedings, Vol. 2062. 6 p. (CEUR Workshop Proceedings, Vol. 2062).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
2017

Data Warehousing in Cloud Environments

Thomsen, C. & Pedersen, T. B., 5 Apr 2017, Encyclopedia of Database Systems. New York: Springer, 6 p.

Research output: Contribution to book/anthology/report/conference proceedingBook chapterResearchpeer-review

57 Downloads (Pure)

MAIME: A Maintenance Manager for ETL Processes

Butkevicius, D., Freiberger, P. D., Halberg, F. M., Hansen, J. B., Jensen, S., Tarp, M., Huang, H. X. & Thomsen, C., 15 Mar 2017, Proceedings of the Workshops of the EDBT/ICDT 2017 Joint Conference (EDBT/ICDT 2017). CEUR Workshop Proceedings, 10 p. 8. (CEUR Workshop Proceedings, Vol. 1810).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Managers
Mathematical transformations
Servers
Competitive intelligence
Industry

SM4MQ: A Semantic Model for Multidimensional Queries

Varga, J., Dobrokhotova, E., Romero, O., Pedersen, T. B. & Thomsen, C., 25 May 2017, 16 p. (DB Tech Reports; No. 37).

Research output: Book/ReportReportResearch

Semantics
Processing
Semantic Web
Metadata
Data structures
1 Citation (Scopus)
22 Downloads (Pure)

SM4MQ: A Semantic Model for Multidimensional Queries

Varga, J., Dobrokhotova, E., Romero, O., Pedersen, T. B. & Thomsen, C., 16 May 2017, The Semantic Web: 14th International Conference, ESWC 2017, Portorož, Slovenia, May 28 – June 1, 2017, Proceedings, Part I. Springer, p. 449-464 16 p. ( Lecture Notes in Computer Science, Vol. 10249).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Semantics
Processing
Semantic Web
Metadata
Data structures
27 Citations (Scopus)
140 Downloads (Pure)

Time Series Management Systems: A Survey

Jensen, S. K., Pedersen, T. B. & Thomsen, C., 17 Aug 2017, In : I E E E Transactions on Knowledge & Data Engineering. 29, 11, p. 2581 - 2600 20 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
2016
12 Citations (Scopus)

Dimensional enrichment of statistical linked open data

Varga, J., Vaisman, A., Romero, O., Etcheverry, L., Pedersen, T. B. & Thomsen, C., 2016, In : Journal of Web Semantics. 40, p. 22-51 30 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Processing
Semantics
Semantic Web
Experiments
1 Citation (Scopus)

Efficient Approximate OLAP Querying Over Time Series

Perera, K. B. D. K. S., Hahmann, M., Lehner, W., Pedersen, T. B. & Thomsen, C., 2016, Proceedings of the 20th International Database Engineering & Applications Symposium. Association for Computing Machinery, p. 205-211 7 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Time series
Competitive intelligence
Query processing
Redundancy
Agglomeration
1 Citation (Scopus)

Modeling and Analyzing Electric Vehicle Charging

Andersen, O., Krogh, B. B., Thomsen, C. & Torp, K., 13 Jun 2016, 17th IEEE International Conference on Mobile Data Management - Porto, Portugal. Bifet, A. & OLIVER, NURIA. (eds.). Porto: IEEE Press, Vol. 1. p. 302–309 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

10 Citations (Scopus)

QB2OLAP: Enabling OLAP on Statistical Linked Open Data

Varga, J., Etcheverry, L., Vaisman, A., Romero, O., Pedersen, T. B. & Thomsen, C., 2016, Proceedings of 2016 IEEE 32nd International Conference on Data Engineering (ICDE). IEEE, p. 1346-1349 4 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Processing
Semantics
Query languages
Semantic Web
2015

MIRABEL DW: Managing Complex Energy Data in a Smart Grid

Siksnys, L., Thomsen, C. & Pedersen, T. B., 17 Jul 2015, Transactions on Large-Scale Data- and Knowledge-Centered Systems XXI: Selected Papers from DaWaK 2012. Hameurlain, A., Küng, J., Wagner, R., Cuzzocrea, A. & Dayal, U. (eds.). Springer, p. 48-72 (Lecture Notes in Computer Science, Vol. 9260).

Research output: Contribution to book/anthology/report/conference proceedingBook chapterResearchpeer-review

Data warehouses
Information management
Data structures
Time series
Railroad cars
4 Citations (Scopus)
4 Downloads (Pure)

Modeling Large Time Series for Efficient Approximate Query Processing

Perera, K. S., Hahmann, M., Lehner, W., Pedersen, T. B. & Thomsen, C., 30 Jul 2015, Database Systems for Advanced Applications: DASFAA 2015 International Workshops, SeCoP, BDMS, and Posters, Hanoi, Vietnam, April 20-23, 2015, Revised Selected Papers. Liu, A., Ishikawa, Y., Qian, T., Nutanong, S. & Cheema, M. A. (eds.). Springer, p. 190-204 15 p. (Lecture Notes in Computer Science; No. 9052).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Query processing
Time series
Data warehouses
Terminology
Decision support systems
5 Citations (Scopus)

SpotADAPT: Spot Aware (re-)Deployment of Analytical Processing Tasks on Amazon EC2

Kaulakiene, D., Thomsen, C., Pedersen, T. B., Cetintemel, U. & Kraska, T., 23 Oct 2015, Proceedings of the ACM Eighteenth International Workshop On Data Warehousing and OLAP (DOLAP 2015). New York, NY, USA: Association for Computing Machinery, p. 59-68 10 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Web services
Processing
Cloud computing
Costs
Availability
2014
2 Citations (Scopus)

An Advanced Data Warehouse for Integrating Large Sets of GPS Data

Andersen, O., Krogh, B. B., Thomsen, C. & Torp, K., 7 Nov 2014, Proceedings of the 17th International Workshop on Data Warehousing and OLAP . Association for Computing Machinery, p. 13-22 10 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Data warehouses
Global positioning system
Fuel consumption
13 Citations (Scopus)

CloudETL: Scalable Dimensional ETL for Hive

Liu, X., Thomsen, C. & Pedersen, T. B., 2014, Proceedings of the 18th International Database Engineering & Applications Symposium . Association for Computing Machinery, p. 195-206 12 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Mathematical transformations
Processing
Stars
Productivity
Experiments

Foreword

Jensen, C. S., Lu, H., Pedersen, T. B., Thomsen, C. & Torp, K., 2014, Proceeedings of the 26th International Conference on Scientific and Statistical Database Management. Association for Computing Machinery, 2 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

5 Citations (Scopus)

SM4AM: A Semantic Metamodel for Analytical Metadata

Varga, J., Romero, O., Pedersen, T. B. & Thomsen, C., 2014, Proceedings of the 17th International Workshop on Data Warehousing and OLAP. Association for Computing Machinery, p. 57-66 10 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Metadata
Semantics
12 Citations (Scopus)

Towards Next Generation BI Systems: The Analytical Metadata Challenge

Varga, J., Romero, O., Pedersen, T. B. & Thomsen, C., 2014, Data Warehousing and Knowledge Discovery: 16th International Conference, DaWaK 2014 Munich, Germany, September 2-4, 2014 Proceedings. Springer Publishing Company, Vol. 8646. p. 89-101 13 p. (Lecture Notes in Computer Science).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Competitive intelligence
Metadata
Automation
Decision making
2013
7 Citations (Scopus)

ETLMR: A Highly Scalable Dimensional ETL Framework based on MapReduce

Xiufeng, L., Thomsen, C. & Pedersen, T. B., 2013, Transactions on Large-Scale Data- and Knowledge-Centered Systems VIII: Special Issue on Advances in Data Warehousing and Knowledge Discovery. Springer VS, Vol. 7790. p. 1-31 31 p. (Transactions on Large-Scale Data- and Knowledge-Centered Systems). (Lecture Notes in Computer Science, Vol. 7790).

Research output: Contribution to book/anthology/report/conference proceedingBook chapterResearchpeer-review

Mathematical transformations
Data warehouses
Processing
Resource allocation
Stars
3 Citations (Scopus)
568 Downloads (Pure)

Real-Time Business Intelligence in the MIRABEL Smart Grid System

Fischer, U., Kaulakiene, D., Khalefa, M., Lehner, W., Pedersen, T. B., Siksnys, L. & Thomsen, C., 2013, Enabling Real-Time Business Intelligence: 6th International Workshop, BIRTE 2012, Held at the 38th International Conference on Very Large Databases, VLDB 2012, Istanbul, Turkey, August 27, 2012, Revised Selected Papers. Castellanos, M., Dayal, U. & Rundensteiner, E. A. (eds.). Springer Publishing Company, p. 1-22 22 p. (Lecture Notes in Business Information Processing, Vol. 154).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

File
Competitive intelligence
Time series
Query processing
Information management
Agglomeration
2012
525 Downloads (Pure)

3XL: An Efficient DBMS-based Triple-store

Xiufeng, L., Thomsen, C. & Pedersen, T. B., Sep 2012, The 23rd International Workshop on Database and Expert Systems Applications. IEEE Computer Society Press, p. 284-288 6 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

File
Ontology

CloudETL: Scalable Dimensional ETL for Hadoop and Hive

Xiufeng, L., Thomsen, C. & Pedersen, T. B., 2012, Department of Computer Science, Aalborg University. 31 p. (1DB Technical Report, Vol. TR-31).

Research output: Book/ReportReportResearch

Mathematical transformations
Data warehouses
Stars
Scalability
Productivity
17 Citations (Scopus)

MapReduce-based Dimensional ETL Made Easy

Xiufeng, L., Thomsen, C. & Pedersen, T. B., Aug 2012, In : Proceedings of the VLDB Endowment. 5, 12, p. 1882-1885 4 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Data warehouses
Scalability
Processing
Computer programming
Stars
14 Citations (Scopus)
377 Downloads (Pure)

MIRABEL DW: Managing Complex Energy Data in a Smart Grid

Siksnys, L., Thomsen, C. & Pedersen, T. B., 2012, Data Warehousing and Knowledge Discovery: 14th International Conference, DaWaK 2012, Vienna, Austria, September 3-6, 2012. Proceedings.. Cuzzocrea, A. & Dayal, U. (eds.). Springer, p. 443-457 (Lecture Notes in Computer Science, Vol. 7448).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

File
2011
6 Citations (Scopus)
324 Downloads (Pure)

3XL: Supporting Efficient Operations on Very Large OWL Lite Triple-stores

Liu, X., Thomsen, C. & Pedersen, T. B., Jun 2011, In : Information Systems. 36, 4, p. 765-781 19 p.

Research output: Contribution to journalJournal articleResearchpeer-review

File
Semantic Web
Engines
Experiments
8 Citations (Scopus)

Easy and Effective Parallel Programmable ETL

Thomsen, C. & Pedersen, T. B., 2011, Proceedings of the ACM 14th International Workshop on Data warehousing and OLAP. New York, NY, USA: Association for Computing Machinery, p. 37-44 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Data warehouses
Program processors
Clocks
19 Citations (Scopus)
816 Downloads (Pure)

ETLMR: A Highly Scalable Dimensional ETL Framework Based on MapReduce

Liu, X., Thomsen, C. & Pedersen, T. B., Sep 2011, In : Lecture Notes in Computer Science. 6862, p. 96-111

Research output: Contribution to journalConference article in JournalResearchpeer-review

File
MapReduce
Mathematical transformations
Transform
Data warehouses
Data Warehouse
19 Citations (Scopus)

ETLMR: A Highly Scalable Dimensional ETL Framework based on MapReduce

Xiufeng, L., Thomsen, C. & Pedersen, T. B., 1 Aug 2011, English. Tech Report TR-29: Department of Computer Science, Aalborg University, 25 p.

Research output: Contribution to book/anthology/report/conference proceedingReport chapterResearch

Mathematical transformations
Data warehouses
Processing
Resource allocation
Stars
2 Citations (Scopus)

The ETLMR MapReduce-Based ETL Framework

Xiufeng, L., Thomsen, C. & Pedersen, T. B., 2011, Proceedings of the 23rd International Conference on Scientific and Statistical Database Management. Cushing, J. B., French, J. & Bowers, S. (eds.). Vol. 6809. p. 586-588 3 p. (Lecture Notes in Computer Science).

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearchpeer-review

Mathematical transformations
Computer programming
Stars
Scalability
Productivity
2010

Multidimensional Databases and Data Warehousing

Jensen, C. S., Pedersen, T. B. & Thomsen, C., 2010, Morgan & Claypool Publishers. 112 p. (Synthesis Lectures on Data Management; No. 9).

Research output: Book/ReportBookResearchpeer-review

Data base
Data warehousing
Join
Data modeling
Materialized views
2009
20 Citations (Scopus)

A Survey of Open Source Tools for Business Intelligence

Thomsen, C. & Pedersen, T. B., 2009, In : International Journal of Data Warehousing and Mining. 5, 3, p. 56-75

Research output: Contribution to journalJournal articleResearchpeer-review

Competitive intelligence
Servers
Mathematical transformations
Processing
26 Citations (Scopus)
1 Downloads (Pure)

pygrametl: A Powerful Programming Framework for Extract-Transform-Load Programmers

Thomsen, C. & Pedersen, T. B., 2009, Proceedings of the 12th ACM International Workshop on Data Warehousing and OLAP (DOLAP). Association for Computing Machinery, p. 49-56 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Graphical user interfaces
Mathematical transformations
Data warehouses
Experiments
26 Citations (Scopus)
5179 Downloads (Pure)

pygrametl: A Powerful Programming Framework for Extract–Transform–Load Programmers

Thomsen, C. & Pedersen, T. B., 2009, Aalborg: Department of Computer Science, Aalborg University. 18 p. (1DB Technical Report; No. 25).

Research output: Book/ReportReportResearch

Open Access
File
Mathematical transformations
Experiments
2008
508 Downloads (Pure)

Architecture for large-scale automatic web accessibility evaluation based on the UWEM methodology

Ulltveit-Moe, N., Olsen, M. G., Pillai, A. B., Thomsen, C., Gjøsæter, T. & Snaprud, M., 2008, Norsk informatikkonferanse, NIK 2008. TAPIR Akademisk Forlag, 12 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Websites
Data warehouses
Internet
Observatories
World Wide Web
2711 Downloads (Pure)

Aspects of Data Warehouse Technologies for Complex Web Data

Thomsen, C., 2008, Aalborg Universitet. 164 p. (Ph.D. thesis; No. 42).

Research output: Book/ReportPh.D. thesisResearch

Open Access
File
Data warehouses
Competitive intelligence
Observatories
XML
Mathematical transformations
2377 Downloads (Pure)

A Survey of Open Source Tools for Business Intelligence

Thomsen, C. & Pedersen, T. B., 2008, Aalborg: Institut for Datalogi, Aalborg Universitet. 27 p. (1DB Technical Report; No. 23).

Research output: Book/ReportReportResearch

Open Access
File
Competitive intelligence
Servers
Processing
163 Downloads (Pure)

Functional EIAO DW, R2.2: Deliverable 6.3.3.1-3

Thomsen, C., Pedersen, T. B., Frøkjær, J. & Mayeli, M., 2008, 1.0.1 ed. European Internet Accessibility Observatory. 25 p.

Research output: Book/ReportReportResearch

Open Access
File
observatory
resource
accessibility
1166 Downloads (Pure)
Open Access
File
observatory
resource
accessibility
40 Citations (Scopus)

RiTE: Providing On-Demand Data for Right-Time Data Warehousing

Thomsen, C., Pedersen, T. B. & Lehner, W., 2008, Proceedings of the Twentyfourth International Conference on Data Engineering. Electrical Engineering/Electronics, Computer, Communications and Information Technology Association, p. 456-465 10 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Data warehouses
Availability
Concurrency control
Middleware
Data storage equipment
2007
150 Downloads (Pure)

Documentation for Functional EIAO DW, R2.0: Deliverable 6.3.3.1-2

Pedersen, T. B., Thomsen, C., Mayeli, M. & Frøkjær, J., 2007, 31 p.

Research output: Book/ReportReportResearch

Open Access
File
2006
9 Citations (Scopus)

Building a Web Warehouse for Accessibility Data

Thomsen, C. & Pedersen, T. B., 2006, Proceedings of the 9th ACM international workshop on Data warehousing and OLAP. Association for Computing Machinery, p. 43-50 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

ETLDiff: A Semi-automatic Framework for Regression Test of ETL Software

Thomsen, C. & Pedersen, T. B., 2006, Proceedings of the Eighth International Conference on Data Warehousing and Knowledge Discovery. Tjoa, A. M. & Trujillo, J. (eds.). Springer, 12 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review