term dependence on the semantic web
DESCRIPTION
Term Dependence on the Semantic Web. Gong Cheng and Yuzhong Qu Institute of Web Science (IWS) Southeast University, P.R. China at ISWC 2008, Karlsruhe, Germany. What is happening on the hypertext Web. foaf:Agent. rdfs:subClassOf. rdfs:subClassOf. foaf:Person. wn:Agent-3. - PowerPoint PPT PresentationTRANSCRIPT
Institute of Web Science
iws.seu.edu.cn
Term Dependence on the Semantic Web
Gong Cheng and Yuzhong Qu
Institute of Web Science (IWS)
Southeast University, P.R. China
at ISWC 2008, Karlsruhe, Germany
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
What is happening on the hypertext Web
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
How about the Semantic Web
foaf:Person
foaf:Agent
wn:Agent-3
rdfs:subClassOfrdfs:subClassOf
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Term Dependence Graph (TDG)
foaf:Person
foaf:Agent
rdfs:subClassOf
wn:Agent-3
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Data Set
As of April 20089.8 million well-formed RDF documents114,408 hosts, or 7,290 registered domain names400 million RDF triples
http://iws.seu.edu.cn/services/falcons/
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Distribution of RDF documents on websites
bio2rdf.org
dbpedia.org
openlinksw.com
buzznet.com
bibsonomy.org
l3s.de
…
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Size distribution of RDF documents
Maximum at 5
NCI ThesaurusWordNet
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
How large is the TDG analyzed
1,278,233 terms as nodes (from 3,039 vocabularies)1,158,480 classes (90.6%)
118,808 properties (9.3%)
945 both (0.1%)
7,312,657 arcs (after removing self-loops)
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Distribution of terms in vocabularies
EthanAnimals
OpenCyc
DBpedia propertiesEthanAnimals
FMA
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Degree analysis of TDG
In-degree: direct influence degree
Out-degree: direct dependence degree
Average in-/out-degree: 5.72
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
In-degree
rdf:type
rdfs:subClassOf
owl:Class
rdfs:label
rdfs:comment
rdfs:Class
owl:equivalentClass
…
cyc:guid
…
64.9%
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Out-degree
40.9% at 5
Focal classes
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Correlation
Pearson’s correlation coefficient between in-degrees and out-degrees
0.006 [-1, 1]∈
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Distance analysis of TDG
foaf:Person
foaf:Agent
rdfs:subClassOf
wn:Agent-3
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Dependence depth
Average dependence depth: 10
Leaf classes in FMA
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Hop plot and effective diameter
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Connectivity analysis of TDG
93.4%
in FMA
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Connectivity analysis of TDG
over 40,000 disconnected pieces after 16 nodes are removed
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Vocabulary Dependence Graph (VDG)
foaf:Person
foaf:Agent
rdfs:subClassOf
wn:Agent-3
foaf
rdfs
wn
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
How large is the VDG analyzed
3,039 vocabularies as nodes
11,392 arcs (after removing self-loops)
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Degree analysis of VDG
rdf, rdfs, owl, daml
Average in-/out-degree: 3.75
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Main results
Power-laws
Complex structures within ontologieslong distance between terms
Only a few links between ontologies (excluding language-level ontologies)
All the data are available online.
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
More words
Linking Open Data (LOD)
Linking Ontologies on the Web (LOW)third-party links, e.g. ontology matching
publishing links online (collaboratively)
Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Thank you for your attention
English Chinese Pronunciation
Semantic Web 语义网 yu`yiwon
Ontology 本体 benty
Class 类 ley
Property 属性 shu`shin
