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™™‰‰™‰‰™‰‰‰Detecting, Understanding and Exploiting Web communitiesClosureby Athena Vakali & Ioannis KompatsiarisConclusionsin summary ...different community definitions – most of them rely on structure – Web relevant : graph/spectral; overlapping & interactions-driven (Web 2.0) significant number of community detection methodologies - Web relevant : centralityqy/cliques, Bippgartite graph-based,y, Modularity optimization (in general: computationally efficient approaches)Web graph visualization - Web relevant : communities are not always “guaranteed”exploitations of communities on the Web :navigation, retrievalrecommendationssocial Web 2.0content outsourcing....Detecting, Understanding and Exploiting Web communitiesAthena Vakali & Ioannis Kompatsiaris 2™™™™™™™™™™™Trends Trends - - IIssues ssues (()I)huge scales on the Web – communities to support compression – algorithms optimizationexitistiing experimentattiions on fftragmented datasets -standard test sets for comparisons are neededprohibiting complexities require approximationscommunities evaluation – more than the modularity measureDetecting, Understanding and Exploiting Web communitiesAthena Vakali & Ioannis Kompatsiaris 3Trends -Trends - IIssues ssues (()II) communities evolution & dynamics (time, social/semantic criteria)embed communities to the informationinformation rretrievaletrieval processcommunities interpretation … are they meaningful/useful ...

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Publié par	Irgu
Nombre de lectures	8
Langue	English

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Detecting Understanding and

Detecting, Understanding and

Exploiting Web communities

Closure

by Athena Vakali & Ioannis Kompatsiaris

Conclusions

in summary ...

different community definitions – most of them rely on structure –

Web

relevant :

graph/spectral; overlapping & interactions-driven (Web 2.0)

significant number of community detection methodologies

Web relevant :

centrality/cliques, Bipartite graph-based, Modularity optimization (in

general: computationally efficient approaches)

Web graph visualization -

Web relevant :

communities are not always

“guaranteed”

exploitations of communities on the Web :

navigation, retrieval

recommendations

social Web 2.0

content outsourcing

....

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

Trends

Trends - Issues (I)

Issues (I)

huge

scales

on the Web – communities to support

compression

algorithms optimization

compression – algorithms optimization

existing experimentations on

fragmented datasets

standard test sets for comparisons are needed

prohibiting

complexities

require approximations

communities

evaluation

– more than the modularity

measure

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

Trends

Trends - Issues (II)

Issues (II)

communities

evolution & dynamics

(time,

social/semantic criteria)

embed communities

to the information retrieval

embed communities

to the information retrieval

process

communities

interpretation

… are they

meaningful/useful ?

communities for

tagging

networks

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

some indicative work for

inspiring future research efforts

Incorporating community models in search

engines

Communities as a barometer of the

blogosphere

Enriching semantic web ontologies with

community models

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

Incorporating community

models in search engines

Exploitation of web user sessions

Session Interest

Graphs

Community detection & summarization

Graphs

Community detection & summarization

Assignment of new sessions to one of existing

communities

Use of Bayesian models for incorporating

community information in retrieval

[Almeida04]

Conventional retrieval model

Community-aware retrieval model

Conventional retrieval model

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

Communities as a barometer

of the blogosphere

Creation of the blog

graphs

community

detection

tensor

politics

model

community

evolution

[Chi2007]

hurricane Katrina

community temporal trends

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

Enriching SW ontologies with

community models

Exploitation of user interactions online (particularly in Web 2.0 applications)

Graph representation

Community detection

Incorporation of

Graph representation

Community detection

Incorporation of

community models in the ontology engineering process

[Specia07], [Mika05]

The extracted ontologies will:

Better reflect the knowledge model as perceived by each community

Embed temporal dimension

ii) Localized ontologies per user community

i) Group of relevant concepts emerged from del.icio.us

User

Community

User

Community

Mapping

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

Community

References

[Almeida04] Almeida, R. B. and Almeida, V. A. 2004. A community-aware search

f th 13th i t

l C

W ld Wid W b

engine. In

Proceedings of the 13th international Conference on World Wide Web

(New

York, NY, USA, May 17 - 20, 2004). WWW '04. ACM, New York, NY, 413-421.

[Chi07] Chi, Y., Zhu, S., Song, X., Tatemura, J., and Tseng, B. L. 2007. Structural and

temporal analysis of the blogosphere through community factorization. In

Proceedings

of the 13th ACM SIGKDD international Conference on Knowledge Discovery and Data

Mining

(San Jose, California, USA, August 12 - 15, 2007). KDD '07. ACM, New York,

NY, 163-172.

[Specia07] Specia, L. and Motta, E. 2007. Integrating Folksonomies with the Semantic

Web. In Proceedings of the 4

European Semantic Web Conference (ESWC ’07),

Innsbruck, Austria, pp. 624-639

[Mika05] Mika, P. 2005. Ontologies Are Us: A Unified Model of Social Networks and

Semantics. In Proceedings of

the 4

International Semantic Web Conference (ISWC’

05), Galway, Ireland, pp. 522-536

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

Athena Vakali & Ioannis Kompatsiaris

Detecting, Understanding and Exploiting Web communities

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