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You Cannot ReSIST. Hugh Glaser Electronics & Computer Science University of Southampton DSSE, 28th February 2007. With. Ian Millard Afraz Jaffri Benedicto Rodriguez ReSIST Partners esp. Brian Randell. ReSIST. EU Network of Excellence (www.resist-noe.org) Resilient Systems - PowerPoint PPT Presentation
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You Cannot ReSISTYou Cannot ReSIST
Hugh GlaserHugh GlaserElectronics & Computer ScienceElectronics & Computer Science
University of SouthamptonUniversity of Southampton
DSSE, 28th February 2007DSSE, 28th February 2007
With
• Ian Millard
• Afraz Jaffri
• Benedicto Rodriguez
• ReSIST Partners– esp. Brian Randell
ReSISTReSIST
• EU Network of Excellence– (www.resist-noe.org)– Resilient Systems– 15 partners across Europe
• Resilience Knowledge Base
• Resilience-Explicit Computing
• Dissemination
Semantic Web ChallengeWinner 2003
• CS AKTive Space– Gather data – UK People, projects, publications
• Research funding
• Top Universities
– Geographical presentation
• AKT Project (www.aktors.org)
The Challenges• Organisational Intelligence
– Who is doing what where?– What impact are they having?
• Integrating resources – – Research Councils, HEFCE,
HESA, RAE, EU, Institutional DBs and web sites, ePrints, citation services…
• Information is heterogeneous and distributed– Not under own control– Not in a common format…
• Presenting to users
http://triplestore.aktors.org/demo/AKTiveSpace/http://triplestore.aktors.org/demo/AKTiveSpace/
Conceptual Architecture
3store
AKTReferenc
e
AKTReferenc
e
data sources
gatherers and
mediators
ontology knowledge repository
(triplestore)
applications
QuickTime™ and aTIFF (LZW) decompressor
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QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
So what is RDF...?
• Resource Description Framework
• W3C recommendation, comes predominantly from Semantic Web research efforts
• A modelling language designed to represent facts about resources in the World Wide Web
• Can be used to model any abstract domain, things do not have to be accessible on the web to be described in it
RDF: Basic components
• RDF graphs are formed by triples
subject predicate object
Open - SPARQL
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>PREFIX owl: <http://www.w3.org/2002/07/owl#>PREFIX akt: <http://www.aktors.org/ontology/portal#>PREFIX akts: <http://www.aktors.org/ontology/support#>PREFIX wiki: <http://resist.ecs.soton.ac.uk/wiki/>PREFIX course: http://www.resist-noe.org/ontology/courseware#SELECT * WHERE { ?paper akt:has-title ?title . ?paper akt:has-author ?person . ?paper <http://www.aktors.org/ontology/extension#has-
abstract> ?abstract}LIMIT 10
At the Centre
Important Components3store and CRS
• Open source semantic store
• Scalable– ReSIST - 50 million facts– Garlik - 1,000,000,000s
• Uses lack of predefined schema
• Cluster
• Distributed queries next– Across external stores
Triplestore Evaluation
• Consistent Reference Service (CRS)– Where is the Semantic Web here?
• Technologies used
• Who is “Jongho Nang”?
• Which paper is “MPEG 비디오 스트림에 대한 MC-DCT 영역에서의 자막 처리 방법” ?
• Problems– Finding co-referents
• NLP, Statistical, Structural
– Making the knowledge available• Exposing a DB?• (Semantic) Web services• Home page (FOAF file)?
• Identify co-referents– Against different policies - fit for purpose
• Are false positives acceptable?
• Distributed and federated (compare OAI-PMH)• Not a Naming Authority
• Query by URI:– http://dblp.uni-trier.de/People#35ff57fb
• Response from CRS:<ns1:Bundle rdf:about="http://www.aktors.org/ontology/coref#bundle-
a458455fb66f997bf4a67488dbbdbdae"> <ns1:duplicate rdf:resource="http://citeseer.ecs.soton.ac.uk/#P147667"/> <ns1:duplicate rdf:resource="http://dblp.uni-trier.de/People#35ff57fb"/> <ns1:insertedOn>20061126</ns1:insertedOn> <ns1:hasCanon rdf:resource="http://citeseer.ecs.soton.ac.uk/#P147667"/></ns1:Bundle>
• Need to compute fixed point across CRSes• But “canon” can be used• Maintained according to need
– Automatic– By Hand
Real Semantic Web
• The RKB Explorer– Accessing live RDF
• Current ECS?
– Query over multiple SPARQL endpoints• Triplestore per major resource• External triplestores
– Universities– Funding agencies (CORDIS, NSF, etc)
• CRS– Different sources because of different curation– Different types: convenience, good engineering– Different policies: application needs, trust
• At last the Ontology is of some use.
Future for ReSIST• Extend the use of Semantics• Resilient-Explicit Computing
– Model expert knowledge– Model processes– Model components
• Support Engineer/Scientist– Move effectively between
• System design• Knowledge Base• People
– To choose cost, characteristics, etc
• Support Run-Time Deployment– Dynamic Reconfiguration
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