Publication statistics

Pub. period:2003-2009
Pub. count:5
Number of co-authors:5



Co-authors

Number of publications with 3 favourite co-authors:

Georg Buscher:4
Andreas Dengel:4
Ansgar Bernardi:1

 

 

Productive colleagues

Ludger van Elst's 3 most productive colleagues in number of publications:

Andreas Dengel:18
Georg Buscher:16
Andreas Abecker:9
 
 
 

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Ludger van Elst

 

Publications by Ludger van Elst (bibliography)

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2009
 
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Buscher, Georg, Elst, Ludger van and Dengel, Andreas (2009): Segment-level display time as implicit feedback: a comparison to eye tracking. In: Proceedings of the 32nd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval 2009. pp. 67-74. Available online

We examine two basic sources for implicit relevance feedback on the segment level for search personalization: eye tracking and display time. A controlled study has been conducted where 32 participants had to view documents in front of an eye tracker, query a search engine, and give explicit relevance ratings for the results. We examined the performance of the basic implicit feedback methods with respect to improved ranking and compared their performance to a pseudo relevance feedback baseline on the segment level and the original ranking of a Web search engine. Our results show that feedback based on display time on the segment level is much coarser than feedback from eye tracking. But surprisingly, for re-ranking and query expansion it did work as well as eye-tracking-based feedback. All behavior-based methods performed significantly better than our non-behavior-based baseline and especially improved poor initial rankings of the Web search engine. The study shows that segment-level display time yields comparable results as eye-tracking-based feedback. Thus, it should be considered in future personalization systems as an inexpensive but precise method for implicit feedback.

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2008
 
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Buscher, Georg, Dengel, Andreas and Elst, Ludger van (2008): Eye movements as implicit relevance feedback. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 2991-2996. Available online

Reading detection is an important step in the process of automatic relevance feedback generation based on eye movements for information retrieval tasks. We describe a reading detection algorithm and present a preliminary study to find expressive eye movement measures.

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Buscher, Georg, Dengel, Andreas, Elst, Ludger van and Mittag, Florian (2008): Generating and using gaze-based document annotations. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 3045-3050. Available online

In this paper we describe a prototypical system that is able to generate document annotations based on eye movement data. Document parts can be annotated as being read or skimmed. We further explain ideas how such gaze-based document annotations could enhance document-centered office work in the future.

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Buscher, Georg, Dengel, Andreas and Elst, Ludger van (2008): Query expansion using gaze-based feedback on the subdocument level. In: Proceedings of the 31st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval 2008. pp. 387-394. Available online

We examine the effect of incorporating gaze-based attention feedback from the user on personalizing the search process. Employing eye tracking data, we keep track of document parts the user read in some way. We use this information on the subdocument level as implicit feedback for query expansion and reranking. We evaluated three different variants incorporating gaze data on the subdocument level and compared them against a baseline based on context on the document level. Our results show that considering reading behavior as feedback yields powerful improvements of the search result accuracy of ca. 32% in the general case. However, the extent of the improvements varies depending on the internal structure of the viewed documents and the type of the current information need.

© All rights reserved Buscher et al. and/or ACM Press

2003
 
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Abecker, Andreas, Bernardi, Ansgar and Elst, Ludger van (2003): Agent Technology for Distributed Organizational Memories: The Frodo Project. In: ICEIS 2003 2003. pp. 3-10.

 
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