Olaf Görlitz

Publications13
h-index10
Citations834
Highly Influential Citations117
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SPLENDID: SPARQL Endpoint Federation Exploiting VOID Descriptions
In order to leverage the full potential of the Semantic Web it is necessary to transparently query distributed RDF data sources in the same way as it has been possible with federated databases for…
FedBench: A Benchmark Suite for Federated Semantic Data Query Processing
TLDR
This paper presents FedBench, a comprehensive benchmark suite for testing and analyzing the performance of federated query processing strategies on semantic data, which can be customized to accommodate a variety of use cases and compare competing approaches.
SPLODGE: Systematic Generation of SPARQL Benchmark Queries for Linked Open Data
TLDR
A classification methodology for federated SPARQL queries is presented and a heuristic called SPLODGE for automatic generation of benchmark queries that is based on this methodology and takes into account the number of sources to be queried and several complexity parameters is developed.
Federated Data Management and Query Optimization for Linked Open Data
TLDR
This chapter considers some details and implications of some design issues of the current SPARQL standard and presents an improved query optimization approach based on dynamic programming.
TagFS - Tag Semantics for Hierarchical File Systems
TLDR
This paper analyzes the different semantics between strictly hierarchical and tagging-based organisation and maps non-hierarchical tagging and query semantics to the commonly used hierarchical file system semantics, thus combining the benefits of both worlds.
PINTS: peer-to-peer infrastructure for tagging systems
TLDR
This paper introduces the vector space model for characterization of users, resources, and tags and analyzes the problem of constructing a reliable approximation for feature vectors in a fully decentralized setting and introduces possible solutions.
Developing Ontologies in OWL: an Observational Study
TLDR
A user study is described that is carried out in order to improve the understanding of the level of support provided by current ontology engineering tools in the context envisaged by the NeOn project.
TagFS: Bringing Semantic Metadata to the Filesystem
TLDR
TagFS is introduced which allows tagging of files as well as tagbased browsing for arbitrary information objects on top of the local filesystem and is stored in RDF in order to enable easy integration with semantic web and semantic desktop applications.
Tagster - Tagging-Based Distributed Content Sharing
TLDR
This work presents Tagster, a peer-to-peer based tagging system that provides a solution to the challenge of decentralization hampers the efficient computation of global statistics facilitating user navigation.
Lifecycle Knowledge Management: Getting the Semantics Across in X-Media
TLDR
This paper presents some semantic web technologies of the EU integrated project X-Media that build bridges between the various information sources, the different media, the stations of knowledge management and the different communities.
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