Until January 2011 I was member of the Information Retrieval group at the School of Computing Science of the College of Science and Engineering at the University of Glasgow. Before I was working in the Information Systems Working Group at the Faculty of Engineering of the University of Duisburg-Essen, where I did my PhD about a probabilistic, logic-based framework for information modelling and retrieval based on user annotations.
In Glasgow I was working in the Renaissance project, which is concerned with developing a unified information retrieval (IR) theory based on the Quantum Theory (QT) framework to address the emerging challenges of interactive, context-sensitive and multimodal search.
Please also have a look at my CV.
My main research interests are Information Retrieval, Information Systems and Digital Libraries. I have been working on the following topics:
- Probabilistic and logic-based models for Interactive
Information Access and Retrieval (esp. probabilistic Datalog and models
inspired by quantum mechanics)
- Information Access and Anotation Services in Digital Humanities
- Automatic textual and non-textual Categorization
- Recommender Systems, Expert Search and Sentiment Classification
- Semantic Search on Linked Open Data
- Machine learning and Information Retrieval
Please have a look at the overview of quantum and geometry IR literature I am maintaining.
My recent publications deal with several theoretical and practical
aspects of improving interactive information access in information
systems, digital libraries and digital museums.
To this end I contributed in the evaluation of a quantum-inspired
framework for interactive retrieval developed in the context of the
Renaissance project, where we apply a subspace representation for
documents and queries. In particular I focus on the question how
polyrepresentation, a well established principle in the context of
Ingwersen's cognitive model, can be realised in this interactive
framework, which offers us a much richer formalism and representation
than existing ones. Some further work explores polyrepresentation in
the context of document clustering, where we are investigating if users
are better off applying a cluster browsing strategy to find relevant
information, rather than exploring a linear ranked list of documents,
as it is offered by most contemporary search engines.
A huge part of my publications was written when I did my PhD, and is therefore mainly about how to exploit user annotations on digital objects (e.g., documents in a digital library) for information retrieval. The result of this work is a probabilistic, logic-based framework called POLAR, which is based on probablilistic Datalog and thoroughly described in my PhD thesis and many of my publications. Other publications deal with automatic categorization (also w.r.t. non-textual facets like sentiments), advisory dialogues in personal assistants and patent retrieval.
Please see the list of my publications.
I recently gave a tutorial about quantum probabilities and
quantum-inspired IR at the Autum School of the German IR Specialist
ProjectsProjects I have been involved in:
- At the University of Bedfordshire:
- Great War Stories - A crowdsourced digital museum about World War I as experienced by the people in Luton, a town in England
- Intelligent Executive Search
- At the University of Glasgow:
- Renaissance - Modelling Information Retrieval processes using the formalism of Quantum Theory
- INEX Interactive Track 2010
- At the University of Duisburg-Essen:
- POLAR - Probabilistic Object-oriented Logics for Annotation-based Retrieval (my own PhD project)
- CLASSIX - Classification and Intelligent Search on Information in XML
- Initiative for the Evaluation of XML retrieval (INEX)
- LACOSTIR - LAyout, COntent and STructure in Interactive Retrieval
- DELOS - A Network of Excellence on Digital Libraries
- DAFFODIL - Distributed Agents for User-Friendly Access of Digital Libraries
- At Fraunhofer IPSI, Darmstadt:
- COLLATE - Collaboratory for Annotation, Indexing and Retrieval of Digitized Historical Archive Material
- BRICKS - Building Resources for Integrated Cultural Knowledge Services
- SCHOLNET - A Digital Library Testbed to Support Networked Scholarly Communities
- VIP-Advisor - Virtual, independent advisor for personal insurance and finance risk management
I gained teaching experience as a course organiser, teaching
and lecturer on undergraduate and postgraduate level in different
areas of computer science. I am co-ordinator of a newly established BSc
(Hons) Data Science course/programme at the University of Bedfordshire.
At the University of Bedfordshire I am teaching:
- Advanced IT Strategies and Paradigms (lectures about Information Retrieval, XML and Ontologies)
- Programming and Modelling (Java and UML)
- Data Modelling and Management
- Distributed and Parallel Computing
- Grid Services and Distributed Networks
At the University of Glasgow I taught:
- Distributed Information Management / Internet Technologies
- General Readings in Computer Science
At the University of Duisburg-Essen I held lectures and tutorials in the following courses:
- Information Engineering (course organiser)
- Information Retrieval
- Information Mining
- Modelling Methods in Computer Science
I organised a seminar about geometric and quantum-based information retrieval at the University of Hagen. In the past I organised seminars about the Semantic Web at Fraunhofer IPSI.
Research Related Activities
I am managing editor of the International Journal on Digital Libraries (IJDL). If you are interested in submitting an article about digital libraries and related technologies, or information retrieval in the context of digital libraries, please proceed to our online manuscript submission page. Please don't hesitate to contact me in case you have any question regarding IJDL.
I was local organisation chair of The European Conference on Digital Libraries (ECDL 2010) held in Glasgow.
Furthermore, I have been program chair of the information retrieval workshops held at LWA 2009 (in Darmstadt, Germany), LWA 2010 (in Kassel, Germany) and LWA 2011 (in Magdeburg, Germany). This workshop series is organised by the Special Interest Group on Information Retrieval of the German Computing Society. I am also proceedings chair of the Quantum Interaction 2011 symposium in Aberdeen, Scotland. I have been PC/Senior PC member of several prestigious conferences in information retrieval and digital libraries (e.g. SIGIR, CIKM, JCDL, TPDL) and reviewer for world-class journals.
I co-organised the Information Retrieval and Foraging Autumn School held at Schloss Dagstuhl, Germany, in September 2014. I wrote a review of the school for BCS Informer. I also held a tutorial about Information Retrieval Models at that school. I am co-organising the 2nd International Workshop on Bibliometric-enhanced Information Retrieval (BIR2015) to be held at ECIR 2015.
I am treasurer and member of the steering committee of the BCS Information Retrieval Specialist Group. I am member of the steering committee of the Special Interest Group on Information Retrieval of the German Computing Society. I am also member of the editorial board of the Datenbank Spektrum, the official journal of the German Information Retrieval resp. Database special interest groups.
Further Information and Social Media
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My Duisburg-Essen Web site contains more information about my time at the University of Duisburg-Essen, in particular the projects I was involved in and the courses I taught. Some further information, including CV and publication list, can be found on several Web or social media sites: