Papers by Michiel Hildebrand
Porting cultural repositories to the semantic web
@ InProceedings {ANNOCULTOR08, author=" B. Omelayenko", title=" Porting Cultural Repositories to ... more @ InProceedings {ANNOCULTOR08, author=" B. Omelayenko", title=" Porting Cultural Repositories to the Semantic Web", booktitle=" Proceedings of the First Workshop on Semantic Interoperability in the European Digital Library month=" June 2", address=" Tenerife, Spain", year=" 2008", pages=" 14-25", site=" http://multimedia. semanticweb. org/siedl/web/homepage. html", abstract=" In the eCulture project we ported a dozen datasets of different cultural institutions to the Semantic Web.
Within the cultural heritage field, proprietary metadata and vocabularies are being transformed i... more Within the cultural heritage field, proprietary metadata and vocabularies are being transformed into public Linked Data. These efforts have mostly been at the level of large-scale aggregators such as Europeana where the original data is abstracted to a common format and schema. Although this approach ensures a level of consistency and interoperability, the richness of the original data is lost in the process.
In the library, archive, museum and many other domains, objects are routinely described using ter... more In the library, archive, museum and many other domains, objects are routinely described using terms from predefined vocabularies. When object collections need to be merged or linked, a typical question that needs to be answered is how those vocabularies relate. More specifically, one would like to know which concepts from different vocabularies correspond to one another. We will call a set of such correspondences an alignment.
The Web of data enables fragments of information to be identified, described and connected togeth... more The Web of data enables fragments of information to be identified, described and connected together in a rich information environment. Users requiring information are faced with the problem of finding out what information is available, and obtaining sufficient fragments to successfully carry out their task. Systems supporting these tasks can use the fragments, descriptions of them and relationships among them, to improve both the selection and presentation of the information.
Multimedia …, Jan 1, 2011
In recent years several Semantic Web applications have been developed that support some form of s... more In recent years several Semantic Web applications have been developed that support some form of search. These applications provide different types of search functionality and make use of the explicit semantics present in the data in various ways. The aim of this chapter is to give an overview of the semantic search functionalities provided by the current state of the art in Semantic Web applications. Excluding search based on structured query languages such as SPARQL (Prud'homme and Seaborne 2007), we focus on queries based on simple textual entry forms and queries constructed by navigation (e.g. faceted browsing). We provide a systematic understanding of the different design dimensions that play a role in supporting search on Semantic Web data. Using the required insights, we describe the design decisions made in two of our own tools with practical use cases.
few.vu.nl
In the audiovisual domain tagging games are explored as a method to collect user-generated metada... more In the audiovisual domain tagging games are explored as a method to collect user-generated metadata. For example, the Netherlands Institute for Sound and Vision deployed the video labelling game Waisda? to collect user tags for videos from their collection. These tags are potentially useful to improve the access to the content within the videos. However, the uncontrolled and often incomplete tags allow for multiple interpretations, preventing long term access. In this paper we investigate a semi-automatic process to define the interpretation of the tags by linking them to concepts from the Linked Open Data cloud. More specifically, we investigate if existing web services are suited to find a number of candidate concepts, and if human users can select the most appropriate concept from these suggestions in the context of the video. We present a prototype application that supports this process and discuss the results of a user experiment where this application is used with different data sources.
CWI. Information …, Jan 1, 2010
Research and Advanced …, Jan 1, 2011
In many heritage institutes, objects are routinely described using terms from predefined vocabula... more In many heritage institutes, objects are routinely described using terms from predefined vocabularies. When object collections need to be merged or linked, the question arises how those vocabularies relate. In practice it often unclear for data providers how well alignment tools will perform on their specific vocabularies. This creates a bottleneck to align vocabularies, as data providers want to have tight control over the quality of their data. We will discuss the key limitations of current tools in more detail and propose an alternative approach. We will show how this approach has been used in two alignment use cases, and demonstrate how it is currently supported by our Amalgame alignment platform. 4
Proceedings of the …, Jan 1, 2011
Recently, various crowdsourcing initiatives showed that targeted efforts of user communities resu... more Recently, various crowdsourcing initiatives showed that targeted efforts of user communities result in massive amounts of tags. For example, the Netherlands Institute for Sound and Vision collected a large number of tags with the video labeling game Waisda?. To successfully utilize these tags, a better understanding of their characteristics is required. The goal of this paper is twofold: (i) to investigate the vocabulary that users employ when describing videos and compare it to the vocabularies used by professionals; and (ii) to establish which aspects of the video are typically described and what type of tags are used for this. We report on an analysis of the tags collected with Waisda?. With respect to the first goal, we compared the the tags with a typical domain thesaurus used by professionals, as well as with a more general vocabulary. With respect to the second goal, we compare the tags to the video subtitles to determine how many tags are derived from the audio signal. In addition, we perform a qualitative study in which a tag sample is interpreted in terms of an existing annotation classification framework. The results suggest that the tags complement the metadata provided by professional cataloguers, the tags describe both the audio and the visual aspects of the video, and the users primarily describe objects in the video using general descriptions.
Proceedings of the …, Jan 1, 2010
Why Evaluating Semantic Web Applications is Difficult. Exploring HCI Challenges
DsG+].: http://CEUR-WS. org
ABSTRACT This position paper discusses our experience in evaluating our cultural search and annot... more ABSTRACT This position paper discusses our experience in evaluating our cultural search and annotation engine. We identify three aspects that determine the quality of a semantic web application as a whole, namely: the quality of data set, the quality of underlying search and inference software and the quality of the user interface. We argue that evaluation of semantic web applications is particularly difficult because of the strong interdependency between the three aspects.
The design space of a configurable autocompletion component
CWI. Information …, Jan 1, 2007
Autocompletion is a commonly used interface feature in diverse applications. Semantic Web data ha... more Autocompletion is a commonly used interface feature in diverse applications. Semantic Web data has, on the one hand, the potential to provide new functionality by exploiting the semantics in the data used for generating autocompletion suggestions. Semantic Web applications, on the other hand, typically pose extra requirements on the semantic properties of the suggestions given. When the number of syntactic matches becomes too large, some means of selecting a semantically meaningful subset of suggestions to be presented to ...
… in Information Retrieval, Jan 1, 2009
We describe two user studies that investigate organization strategies of autocompletion in a know... more We describe two user studies that investigate organization strategies of autocompletion in a known-item search task: searching for terms taken from a thesaurus. In Study 1, we explored ways of grouping term suggestions from two different thesauri (TGN and WordNet) and found that different thesauri may require different organization strategies. Users found Group organization more appropriate for location names from TGN, while Alphabetical works better for object names from WordNet. In Study 2, we compared three different organization strategies (Alphabetical, Group and Composite) for location name search tasks. The results indicate that for TGN autocompletion interfaces help improve the quality of keywords, Group and Composite organization help users search faster, and is perceived easier to understand and to use than Alphabetical.
Intelligent virtual agents, Jan 1, 2003
In this paper we describe the implementation of interactive agents capable of gathering and exten... more In this paper we describe the implementation of interactive agents capable of gathering and extending their knowledge. Interactive agents are designed to perform tasks requested by a user in natural language. Using simple sentences the agent can answer questions and in case a task can not be fulfilled the agent must communicate with the user. In particular, an interactive agent can tell when necessary information for a task is missing, giving the user a chance to supply this information, which may in effect result in teaching the agent. The interactive agent platform is implemented in DLP, a tool for the implementation of 3D web agents. In this paper we discuss the motivation for interactive agents, the learning mechanisms and it's realization in the DLP platform.
Prolog as the Fundament for Applications on the Semantic Web
CEUR Workshop …, Jan 1, 2007
KNAW Narcis. Back to search results. Publication Prolog as the Fundament for Applications on the ... more KNAW Narcis. Back to search results. Publication Prolog as the Fundament for Applications on the Semantic Web (2007). Pagina-navigatie: Main. ...
Visual Interfaces to the Social and …, Jan 1, 2009
We demonstrate how to develop Web-based user interfaces for Semantic Web applications using commo... more We demonstrate how to develop Web-based user interfaces for Semantic Web applications using commonly available, off-the-shelf Web widget libraries. By formally defining the underlying data model that is assumed by these widgets, Semantic Web application developers can use familiar RDF constructs to map their own data to the model implemented by the Widgets. As an example, we briefly describe the interface model underlying our own framework, and provide concrete examples showing how it has been used to create Semantic Web applications in two different domains. We conclude by discussing the advantages and limitations of our approach.
International Journal of …, Jan 1, 2009
We performed a user experiment in which museum professionals used vocabularies from the Web for a... more We performed a user experiment in which museum professionals used vocabularies from the Web for annotating the subject matter of museum objects. In this paper, we study the requirements on the underlying RDF dataset, search algorithms and user interface design in a real world setting. We identify the advantages of reusing vocabularies from the Web and discuss how and to what extent the disadvantages can be overcome. The study is performed at the Print Room of the Rijksmuseum Amsterdam, where currently a large collection of prints, photographs and drawings is being catalogued. We report on the analysis of the current practice of professional cataloguers, the iterative design of an annotation tool and a qualitative evaluation of this tool with a user experiment in a realistic annotation environment. We discuss our findings in terms of their impact on the RDF data, the semantic search functionality and the user interface. r
The Semantic Web- …, Jan 1, 2008
In cultural heritage, large virtual collections are coming into existence. Such collections conta... more In cultural heritage, large virtual collections are coming into existence. Such collections contain heterogeneous sets of metadata and vocabulary concepts, originating from multiple sources. In the context of the E-Culture demonstrator we have shown earlier that such virtual collections can be effectively explored with keyword search and semantic clustering. In this paper we describe the design rationale of ClioPatria, an open-source system which provides APIs for scalable semantic graph search. The use of ClioPatria's search strategies is illustrated with a realistic use case: searching for "Picasso". We discuss details of scalable graph search, the required OWL reasoning functionalities and show why SPARQL queries are insufficient for solving the search problem.
An analysis of search-based user interaction on the semantic web
CWI. Information Systems [ …, Jan 1, 2007
Many Semantic Web applications provide access to their resources through text-based search querie... more Many Semantic Web applications provide access to their resources through text-based search queries, using explicit semantics to improve the search results. This paper provides an analysis of the current state of the art in semantic search, based on 35 existing systems. We identify different types of semantic search features that are used during query construction, the core search process, the presentation of the search results and user feedback on query and results. For each of these, we consider the functionality that the ...
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Papers by Michiel Hildebrand