Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI
Now showing 1 - 10 of 10
PublicationQueries in context: Access to digitized historic documents in a collaboratory for the humanities( 2005)
;Thiel, U. ;Brocks, H. ;Dirsch-Weigand, A. ;Everts, A. ;Frommholz, I.Stein, A.In contrast to standard digital libraries, systems addressing the specific requirements of cultural heritage need to deal with digitized material like scanned documents instead of home digital items. Such systems aim at providing the means for domain experts, e.g. historians, to collaboratively work with the given material. To support their work, automatic indexing mechanisms for both textual and pictorial digitized documents need to be combined with retrieval methods exploiting the content as well as the context of information items for precise searches. In the COLLATE project we devised several access methods using textual contents, feature extraction from images, metadata, and annotations provided by the users.
PublicationLanguage modeling for effective construction of domain specific thesauri( 2004)
;Chen, L.B.Thiel, U.In this paper we present an approach for effective construction of domain specific thesauri. We assume that the collection is partitioned into document categories. By taking advantage of these pre-defined categories, we are able to conceptualize a new topical language model to weight term topicality more accurately. With the help of information theory, interesting relationships among thesaurus elements are discovered deductively. Based on the "Layer-Seeds" clustering algorithm, topical terms from documents in a certain category will be organized according to their relationships in a tree-like hierarchical structure --- a thesaurus. Experimental results show that the thesaurus contains satisfactory structures, although it differs to some extent from a manually created thesaurus. A first evaluation of the thesaurus in a query expansion task yields evidence that an increase of recall can be achieved without loss of precision.
PublicationAnnotations in digital libraries and collaboratories( 2004)
;Agosti, M. ;Ferro, N. ;Frommholz, I.Thiel, U.This paper presents the results of our study regarding the different facets and ways of using annotations in both digital libraries and collaboratories. This study represents an innovative attempt at gathering methodological tools and synergies from both fields in order to effectively define a comprehensive model for annotations. Thus we propose a conceptual model for annotations in order to develop an annotation service that can be plugged into digital libraries and collaboratories. Finally, starting from our model, we introduce a search strategy for exploiting annotations in order to search and retrieve relevant documents for a user query.
PublicationDocument-centered collaboration for scholars in the humanities - the COLLATE system( 2003)
;Frommholz, I. ;Brocks, H. ;Thiel, U. ;Neuhold, E. ;Iannone, L. ;Semeraro, G. ;Berardi, M.Ceci, M.In contrast to electronic document collections we find in contemporary digital libraries, systems applied in the cultural domain have to satisfy specific requirements with respect to data ingest, management, and access. Such systems should also be able to support the collaborative work of domain experts and furthermore offer mechanisms to exploit the value-added information resulting from a collaborative process like scientific discussions. In this paper, we present the solutions to these requirements developed and realized in the COLLATE system, where advanced methods for document classification, content management, and a new kind of context-based retrieval using scientific discourses are applied.
PublicationA personalized information search process based on dialoguing agents and user profiling( 2003)
;Semeraro, G. ;Degemmis, M. ;Lops, P. ;Thiel, U.L'Abbate, M.The amount of information available on the web, as well as the number of e-businesses and web shoppers, is growing exponentially. Customers have to spend a lot of time to browse the net in order to find relevant information. One way to overcome this problem is to use dialoguing agents that exploit user profiles to generate personal recommendations. This paper presents a system, designed according to this approach, that adopts a query refinement mechanism to improve the search process of an Internet commerce web site.
PublicationCustomizable Retrieval Functions Based on User Tasks in the Cultural Heritage Domain( 2001)
;Brocks, H. ;Thiel, U. ;Stein, A.Dirsch-Weigand, A.
PublicationAdaptive web meta-search enhanced by contraint-based query constructing and mapping( 2001)
;Huang, L. ;Thiel, U. ;Hemmje, M.Neuhold, E.J.This paper introduces an adaptive method that can be used to construct the query user interfaces for the information integration systems (IIS) on the Web, and a constraint-based method for mapping queries from such IISs into the specific formats of heterogeneous Internet sources. The fuse of this research was ignited by witnessing that WWW information searching becomes harder and harder due to the tremendous development of the Internet and the explosive growth of digital information on the World Wide Web. Incorporating adaptive and constraints-coordinated mechanisms into an information integration system can overcome the diversity of heterogeneous sources and utilize the functionality of the individual sources to the fullest extent.
PublicationDistributed information search with adaptive meta-search engines( 2001)
;Huang, L. ;Thiel, U. ;Hemmje, M.Neuhold, E.J.
PublicationMultimedia management and query processing issues in distributed digital libraries( 1998)
;Thiel, U. ;Hollfelder, S.Everts, A.
PublicationAn abductive linguistic approach to model retrieval( 1997)
;Gulla, J.A. ;Vos, A. van derThiel, U.