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- 19 creator iris-miliaraki.
- 19 creator manolis-koubarakis.
- 19 creator zoi-kaoudi.
- 19 type InProceedings.
- 19 label "RDFS Reasoning and Query Answering on Top of DHTs".
- 19 sameAs 19.
- 19 abstract "We study the problem of distributed RDFS reasoning and query answering on top of distributed hash tables. Scalable, distributed RDFS reasoning is an essential functionality for providing the scalability and performance that large-scale Semantic Web applications require. Our goal in this paper is to compare and evaluate two well-known approaches to RDFS reasoning, namely backward and forward chaining, on top of distributed hash tables. We show how to implement both algorithms on top of the distributed hash table Bamboo and prove their correctness. We also study the time-space trade-off exhibited by the algorithms analytically, and experimentally by evaluating our algorithms on PlanetLab.".
- 19 hasAuthorList authorList.
- 19 hasTopic Semantic_Web.
- 19 isPartOf proceedings.
- 19 keyword "DHTs".
- 19 keyword "RDFS reasoning".
- 19 keyword "backward chaining".
- 19 keyword "distributed".
- 19 keyword "forward chaining".
- 19 title "RDFS Reasoning and Query Answering on Top of DHTs".
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- item-1 hasContent zoi-kaoudi.
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- 192 creator dominik-heim.
- 192 creator leo-sauermann.
- 192 type InProceedings.
- 192 label "Evaluating Long-term use of the Gnowsis Semantic Desktop for PIM".
- 192 sameAs 192.
- 192 abstract "The Semantic Desktop is a means to support users in Personal Information Management (PIM). Using the open source software prototype Gnowsis, we evaluated the approach in a two month case study in 2006 with eight participants. Two participants continued using the prototype and were interviewed after two years in 2008 to show their long-term usage patterns. This allows us to analyse how the system was used for PIM. Contextual interviews gave insights on behaviour, while questionnaires and event logging did not. We discovered that in the personal environment, simple has-part and is-related relations are sufficient for users to file and re-find information, and that the personal semantic wiki was used creatively to note information.".
- 192 hasAuthorList authorList.
- 192 hasTopic Semantic_Web.
- 192 isPartOf proceedings.
- 192 keyword "evaluation".
- 192 keyword "personal information management".
- 192 keyword "personalization".
- 192 keyword "semantic desktop".
- 192 title "Evaluating Long-term use of the Gnowsis Semantic Desktop for PIM".
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- item-1 hasContent leo-sauermann.
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- 194 creator simon-schenk.
- 194 type InProceedings.
- 194 label "On the Semantics of Caching and Trust in the Semantic Web".
- 194 sameAs 194.
- 194 abstract "The Semantic Web is a distributed environment for knowledge representation and reasoning. The distributed nature brings with it failing data sources and inconsistencies between autonomous knowledge bases. To reduce problems resulting from unavailable sources and to improve performance, caching can be used. Caches, however, raise new problems of imprecise or outdated information. We propose to distinguish between certain and cached information when reasoning on the semantic web, by extending the well known FOUR bilattice of truth and knowledge orders to FOUR-C, taking into account cached information. We discuss how users can be offered additional information about the reliability of inferred information, based on the availability of the corresponding information sources. We then extend the framework towards FOUR-T , allowing for multiple levels of trust on data sources. In this extended setting, knowledge about trust in information sources can be used to compute, how well an inferred statement can be trusted and to resolve inconsistencies arising from connecting multiple data sources. We redefine the stable model and well founded semantics on the basis of FOUR-T, and reformalize the Web Ontology Language OWL2 based on logical bilattices, to augment OWL knowledge bases with trust based reasoning.".
- 194 hasAuthorList authorList.
- 194 hasTopic Semantic_Web.
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- 194 keyword "OWL".
- 194 keyword "bilattices".
- 194 keyword "caching".
- 194 keyword "logic programming".
- 194 keyword "trust".
- 194 title "On the Semantics of Caching and Trust in the Semantic Web".
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- 197 creator georgios-meditskos.
- 197 creator nick-bassiliades.
- 197 type InProceedings.
- 197 label "Combining a DL Reasoner and a Rule Engine for Improving Entailment-based OWL Reasoning".
- 197 sameAs 197.
- 197 abstract "We introduce the notion of the mixed DL and entailment-based (DLE) OWL reasoning, defining a framework inspired from the hybrid and homogeneous paradigms for integration of rules and ontologies. The idea is to combine the TBox inferencing capabilities of the DL algorithms and the scalability of the rule paradigm over large ABoxes. Towards this end, we define a framework that uses a DL reasoner to reason over the TBox of the ontology (hybrid-like) and a rule engine to apply a domain-specific version of ABox-related entailments (homogeneous-like) that are generated by TBox queries to the DL reasoner. The DLE framework enhances the entailment-based OWL reasoning paradigm in two directions. Firstly, it disengages the manipulation of the TBox semantics from any incomplete entailment-based approach, using the efficient DL algorithms. Secondly, it achieves faster application of the ABox-related entailments and efficient memory usage, comparing it to the conventional entailment-based approaches, due to the low complexity and the domain-specific nature of the entailments.".
- 197 hasAuthorList authorList.
- 197 hasTopic Semantic_Web.
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