Welcome to the Database Group!

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Vragen over ‘Big Data’

Iedereen heeft het de laatste tijd over Big Data. Maar wat is het eigenlijk? Waarom is het zo'n big deal? En hoe kun je met Big Data omgaan?

Bekijk het antwoord op de video!


Research of Mena Badieh Habib Morgan in the news!

There has been a UT homepage news item with an associated notice to the press about Mena's research. This has been picked up by some journalists from Tweakers.net and NU.nl.

UT homepage: Computers leren beter begrijpend lezen dankzij UT-onderzoek

Tweakers.net: UT laat politiecomputers tweets ‘begrijpen’ voor veiligheid bij evenementen

NU.nl: Universiteit Twente laat computers beter begrijpend lezen


Universiteit Twente krijgt toegang tot Twitter data

Exclusieve data beschikbaar voor onderzoek naar voorlichtingscampagnes over kanker

Onderzoekers van de Universiteit Twente zijn door Twitter vanuit dertienhonderd aanvragen geselecteerd voor de Twitter data grant. De data grant houdt in dat de zes winnende onderzoeksinstellingen een heleboel data van Twitter ontvangen op een door hen in het voorstel beschreven onderwerp. Deze data wordt uitgedrukt in Tweets. De onderzoekers van de UT richten zich op de analyse van campagnes om het bewustzijn van kankerscreening te verhogen.

Lees verder


Twentse vindingen

Twee Twentse vindingen moeten de digitale wereld en de werkelijke wereld een stuk veiliger maken. De Universiteit Twente ontwikkelde een tool om kinderporno op internet eerder op te sporen en de veiligheidsregio Twente presenteerde Tec4se.

Bekijk hier de video!

NS start pilot met reisplanner van UT spin-off Q-Able

De NS start op woensdag 12 maart 2014 een proef met de reisplanner die ontwikkeld is door UT-onderzoeker Kien Tjin-Kam-Jet en spin-off Q-Able. In deze vereenvoudigde reisplanner hoef je nog maar één zoekveld in te vullen.

Voor meer informatie, klik hier.

The Database Group

The Database group mission is to provide data management to create added value on top of autonomous data sources.

Nowadays huge amounts of data are produced by both humans and devices connected to the Internet. This has led to information overload and a decrease in trust of data, as well as an increase of privacy threats. However, applications need high data quality providing privacy. Our research extends database systems with functionality to filter and compute relevant information, to reduce the unreliability of data, and to protect privacy.


Search on semi-structured data. Specifically, XML databases and distributed search


Enriching uncertain data. Specifically, data integration and streaming data


Security and Privacy. Specifically, search in encrypted data and secure handling of medical data.

Applications: web search, sensor network, e-Health, ambient intelligence.

Head of the Database group is Prof.dr. Peter M.G. Apers. Research of the Database group is an integral part of the Strategic Research Orientation ASSIST, Strategic Research Orientation NICE and the Strategic Research Orientation ISTRICE of CTIT.

The Database Group contributes amongst others to the following research systems and projects:

Pathfinder is our XQuery to relational compiler developed at the Database Group in cooperation with CWI Amsterdam and University of Tübingen. The Pathnder project is an exploration of how far we can push the idea of using mature relational database management technology to design and build a full-edged XML database. Pathnder requires only local extensions to the underlying DBMS’s kernel, such as the staircase join operator, a join recognition logic in our compiler, as well as a careful consideration of order properties of relational operators. The compiler is part of MonetDB/XQuery, which is claimed to be the world's most efficient XQuery database system. Website: http://www.pathfinder-xquery.org

PF/Tijah (Pathfinder/Tijah, pronounce as "Pee Ef Teeja") is a flexible open source text search system developed at the Database Group in cooperation with CWI Amsterdam and University of Tübingen. The system is integrated in Pathfinder and can be downloaded as part of the MonetDB/XQuery database system. PF/Tijah is used to aid research in information retrieval at the University of Twente, including the application of language models to search, entity retrieval, expert search and the efficient implementation of the W3C candidate recommendation XQuery Full-Text. Website: http://dbappl.cs.utwente.nl/pftijah/

StreetTivo is a project run in cooperation with the Human Media Interaction (HMI) Group and CWI Amsterdam that will bring video annotation techniques - such as a large-vocabulary speech recognition system, shot detection, low-level feature detectors for query-by-example, high-level feature detectors such as a face detector, etc. - to everybody's living rooms. StreetTivo connects hard disk recorders in a peer-to-peer network, enabling the distribution of workload of video annotation over many small machines. Website: http://streettivo.sf.net

InstantDB opens up a new alternative to protect personal data over time. It is based on the assumption that long lasting purposes of data can often be satisfied with a less accurate, and therefore less sensitive, version of the data. In our data degradation model, called Life Cycle Policy model, data is stored accurately for a short period, such that services can make full use of it, then degraded on time progressively decreasing the sensitivity of the data, until complete removal from the system. Website: http://eprints.eemcs.utwente.nl/11408/

SensorDataLab is our sensor lab environment. It is used to identify issues, develop ideas and validate solutions for sensor data management. The SensorDataLab addresses a localization scenario with four different sensor networks and about 60 deployed devices. In the context of this lab meta data management, streaming data, manual sampled data and provenance data are collected and managed. The goal is to come with storage solutions to support querying, annotating and processing of the different data as well as combinations of the different data types.

Website: http://www.sensordatalab.org


In May 2011 Peter Apers, head of the Database Chair, has given a presentation about the research and teaching activities of the DB group. Just follow the link “presentation DB” to read it.