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Professor Stefan Decker
About me
Selected Past Accomplishments
Anecdotes and other stuff...
Professor
Stefan Decker
Dr. rer-pol.
Dipl.-Inform.
CEng FIEI
MRIA
Informatik 5
RWTH Aachen University
Director,
Fraunhofer FIT
EMAIL: stefan @ stefandecker.org (for private messages only, for work related item please use one of my work email addresses! Work related email may not get noticed or answered.)
OwnCloud Federated Cloud ID:
2C5HT7@rwth-aachen.de@rwth-aachen.sciebo.de
Stefan@Google Scholar
Stefan@Linkedin
Stefan@Twitter
Science Foundation Ireland
produced a great introduction to DERI and our goals and ambitions. DERI and the SFI Research Program is now in the past and has transitioned into the
Insight Centre for Data Analytics
, and I have transitioned to
Fraunhofer FIT
and
RWTH Aachen
, but my research vision remains valid - augmented with infrastructures like data spaces and technologies like generativ AI.
Historic Resources
Vannevar Bush:
As We May Think
, Atlantik Monthly, July 1945
Douglas Engelbart:
Augmenting Human Intellect
, SRI Research Report, October 1962
Douglas Engelbart: "
Mother of All Demos
", Moscone Center, San Francisco, 1968
Metcalfe's Law
And here is confirmation that part of it transitions already into reality: 10 years after we introduced the concepts in the "
Social Semantic Desktop Paper
" and the subsequent Nepomuk project Microsoft implements a Semantic Desktop - see the brain? Now if only Office Graph would work also with non-Microsoft products - and maybe even across systems...? Maybe build the capabilities into the operating system?
All of this continues the work of Douglas Engelbart...
About me
I am a professor at the
RWTH Aachen University
, and a Director of the Fraunhofer
FIT Research Institute
, part of the
Fraunhofer Society
Previously I worked at the National University of Ireland, Galway and as the Director of the
Digital Enterprise Research Institute
and later Insight at NUI Galway (12 years), at
ISI
, University of Southern California (2 years, Research Assistent Professor and Computer Scientist), Stanford University, Computer Science Department (
Database Group
) (3 Years, PostDoc and Research Associate), and
Institute AIFB
, University of Karlsruhe (now KIT Karlsruhe) (4 years, PhD Student and Junior Researcher).
My main research field is the
Semantic Web
. The usual academic self promotion: my
Google Scholar profile
claims my publications have received more than 24000 citations and I have an h-index of 75 (the
h-index
is a metric aiming to measure scientific productivity). Google Scholar also searches authors per organisations (e.g., all authors in Google Scholar from RWTH Aachen) or even (exploiting the country code) from a country. I also maintain a
Linked-In profile
Selected Past Accomplishments
Past accomplishments include:
Fraunhofer FIT and my chair  i5 at RWTH Aachen is now contributing to a large number of different dataspace initiatives and projects: NFDI4Health, NFDI4DataScience, SMITH, common European Energy Dataspace, common European Green Deal Dataspace, german mobility dataspace, to name a few.
The W3C DCAT recommendation was created by a PhD student of mine:
Fadi Maali
and suggested to the commission by Vasillios Peristeras. It is now the standard metadata format for all Open Data portals in the European Union and gains traction for research data management and many other application areas.
My team and myself (mostly my team) drafted the
governmental Irish Open Data Strategy
and provided the alpha version of the
Ireland's Open Data Portal
After I took over the directorship of DERI in 2006 DERI doubled in size and far more-than-doubled its scientific output and reputation. According to Microsoft Academic Search until DERI transitioned into the Insight Centre for Data Analytics, DERI was
recognised as one of the top organisations in World-Wide-Web research
. For these successes DERI was selected by SFI for inclusion into the Insight Centre for Data Analytics, enabling research funding for another 6 years.
I coined and established the term
Social Semantic Desktop
for Personal Knowledge Management with Semantic Web Methods and initiated a large scale EU project (Budget: 17.5 M Euro) dubbed NEPOMUK which included multinationals like IBM, HP and SAP, small companies like Cognium,  research institutes like FZI, DFKI, L3S and DERI, application partners like Institute Louis Pasteur, and a dissemination partner like Edge-IT (Mandriva Linux). The goal of the project was to provide a crystallization point for the development of the Semantic Desktop infrastructure. The results are now part of KDE and distributed with Linux.
I initiated and co-organized (with Isabel Cruz, Jerome Euzenat, and Deborah McGuinness) the
Semantic Web Working Symposium
at Stanford University, the first large scale Semantic Web event (> 250 participants), which spanned the International Semantic Web Conference, which is now organized by the
Semantic Web Science Association
Together with Ian Horrocks I created an RDF representation for the Description Logic SHIQ. The result was merged with the at the time XML-based OIL. Then the RDF part of OIL was the main input for DAML+OIL (I was member of the
DAML+OIL Joint Committee
), which in turn was the main input for
OWL
- the Web Ontology Language.
Since I perceived an editing environment as being critical for the success of Semantic Web standards I pushed for Protege becoming Open Source and wrote the first RDF import/export for Protege, which made Protege compatible with Semantic Web standards  (see my
announcement to the RDF interest mailing list
). Protege is still the most popular editor for Semantic Web Ontologies.
Together with Mario Schlosser, Michael Sintek and Wolfgang Nejdl we created
HyperCuP
, the first Ontology-based routing algorithm and hypercube topology for P2P networks (the main genius behind HyperCuP was Mario). HyperCuP has been used by a couple of projects as a P2P topology.
Together with Wolfgang Nejdl I cofounded the
Edutella
project, the first metadata exchange infrastructure for RDF.
The Semantic Web information foodchain presented in an
ECDL 2000 paper
and depicted at
SemanticWeb.org
is widely used as an architectual model and motivation for Semantic Web technology.
While being at Stanford University as a PostDoc (without having finished my PhD at the time) in 1999 I acquired a 1 M US$ grant from DARPA (
DAML
, Ontoagents, PI: Prof. Gio Wiederhold). I was named key person for the grant, which means the grant would have stayed with me if I had moved. The grant enabled me to establish one of the first Semantic Web research groups.
Together with Dan Brickley, Janne Saarela, and Jürgen Angele I created the first Query and Inference system for RDF (see the
QL'98 paper
).
My work on
Ontobroker
(joint work with Dieter Fensel and Michael Erdmann) was cited as an inspiration for the DARPA
DAML
program, which heavily
influenced the Semantic Web
effort and lead to the development of OWL. My
PhD thesis on the Semantic Web
was one of the first in the field, exploring the use of Semantic Web technologies for Knowledge Management.
My
undergraduate thesis
generalised all at the time known methods for Incremental Checking of Integrity Constraints in Deductive Databases and is the most formal work I have done. It also is the most incomprehensible work I have done. Coincidentally it also is the work with the least impact. The core is a 4 page double induction proof over a data structure representing proofs of Logic Programs done with the
SLDNF-resolution
procedure. I still believe the described Integrity Checking Method has tremendous application potential (it allows for declarative testing of a data set wrt. to compliance with expressive integrity constraints) and just needs to be modernised, properly explained and properly published (in English, for starters). Maybe I find the time when I am retired.
Anecdotes and other stuff...
I made national news in Ireland for buying a car during the
Icelandic ash cloud incident in 2010
, when most of Europe's Air Space was close for commercial flights. Four of us were stranded in Madrid after attending a Future Internet conference in Valencia. I bought a car to drive back to Ireland to be in time for a meeting at Science Foundation Ireland. Amazingly,  buying a car turned out to be the cheapest and fastest solution - I was able to sell the car back in Ireland. During our drive back I posted a short report of our activities to get home on the
RTE website
, where it was picked up and reported on in Morning Ireland, a popular radio show in Ireland. It was also reported on the
BBC Website
. Another team from Ireland decided to try the public transportation route, and we were racing who was back faster. I am proud to report despite one other teams head start of one day (the time it took to buy a car) we made it back on Irish soil one day earlier.
The
original Google Server
consisting of 10 4GB disks and a case built out of Lego was for a while in my office in Stanford University.
When organising the SWWS in Stanford Doug Engelbart contacted me to speak at the event. I had subsequently several meetings with Doug (including a birthday party that he had for Ted Nelson in his house in Atherthon). These meetings heavily influenced my Semantic Desktop and Semantic Web work.
My
Erdös-Number
is at most 4 (via the path:
Paul Erdős
->
Ronald Graham
->
Jeffrey Ullman
->
Gio Wiederhold
-> Stefan Decker).
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