Thesis topics

• Adaptation for music domain
  • finish skiptrax ontology
  • metadata importers/exporters
  • adapter for own audio collection
  • simplify entering song/band information
  • download/cache songs
  • generate playlists, possibly with changing style over time (AutoDJ)
• Metadata sharing
  • optimize synchronization
  • cache and forward data on intermediate nodes in a secure fashion
  • expert recommender (ask friends about people having knowledge about X/interests in Y)
  • superpeer nodes? Possibly represented within the network? (superpeer3-hasFeature-IsHubForMusic)
• Trust network
  • scalable trust metric
  • fast computation of feature summaries
  • fast feature/item similarity measure
  • ​Spreading Activation Models for Trust Propagation
  • explicit representation of trust (see Skippies ontology)
    • user interface changes for that
    • trust metric changes for that
• User interface
  • proper search/view/enter
  • small evaluation
• Ontology evolution
  • simple skipinions ontology editor
  • update and synchronize ontologies (and facts!) on peers

Other things

• Create an RDF importer that changes namespaces
• Facts/graph synchronization idea
  • every peer implements
    • String getDiffForNamespace(String namespace, String haveHash, String wantHash)
    • String getMostCurrentHash()
    • String isValid(String hash)
    • String getPubkey()
    • ? subscribe(?)
  • logic: once a day, every machine dumps its 'own' facts to an NTriples file along with a timestamp and the data's hash
  • when peers call getDiffForNamespace(), a diff from haveHash.dat to wantHash.dat is calculated and sent
  • Distributed Storage
    • simple distributed storage (without signatures) with trust can be implemented usind getMostCurrentHash and isValid
    • distributed storage with signatures can be implemented with getPubkey (using a true keyserver might be desirable though)
    • optimized push synchronization could use some subscription mechanism. Integrate with ​XMPP pubsub?
  • Ontology evolution/rules
    • rules that upgrade existing facts could be added to the diff file

Done

• Internal namespaces for ontologies (xmpp://schwarz@xmpp.km.opendfki.de/ont/ludopinions#UsesDice)
  • this way people can create own ontologies, and ontology management/evolution can be done similar to facts synchronization
• Play sounds from JavaScript: ​http://www.schillmania.com/projects/soundmanager/
• show number of (existing) feature instances for each item (in ItemPane) - metadata certificates
• show number of feature instances for each feature class (in FeaturePane) and arithmetic mean/standard deviation for applicability - metadata certificates
• red/green blobs