Inter-context Trust Bootstrapping for Mobile Content Sharing
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Transcript of Inter-context Trust Bootstrapping for Mobile Content Sharing
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Inter-Context Trust Bootstrapping
for Mobile Content Sharing
(daniele quercia)(stephen hailes & licia capra)
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What do I do?
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Research @
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what I research?
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Reputation Systems for Mobiles
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What’s that?
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Example:antique markets
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Problem: Visitors cannotsee prices of everything!
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Solution: Sellers disseminate
e-ads, and visitors collect them
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Problem: Sellers may disseminate irrelevant ads
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Proposal:
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They may keep track of
which sellers send
irrelevant ads
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Daniele Quercia
Trust model on A: how A decideswhether to rely on B
to visit a stall
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Daniele Quercia
To decide whether to rely on B, A has to
set its initial trust in B
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Daniele Quercia
3 Existing Solutions
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Daniele Quercia
1. Fixed values ( over-simplified)
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Daniele Quercia
2. Recommendations
( fake ones)
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Daniele Quercia
3. Similar contexts( universal ontology)
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Daniele Quercia
Two cases: B is
1. unknown 2. partly known
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Daniele Quercia
1. B is unknown
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Daniele Quercia
Popular way:
Trust propagation (transitivity)
?A B
C
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Daniele Quercia
Meant for the Web & Proved on “binary” ratings
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Daniele Quercia
Algorithm rating • unrated trust relationships (needed)
1
?A B
C2
1 2
?• unrated nodes (chosen)
AB
AC CB
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?
Idea:1. Similar nodes together2. Find function:•same ratings for rated nodes•similar ratings for neighbours
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Daniele Quercia
Tested on real data (Advogato: > 55K user ratings)
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Daniele Quercia
2. B is partly known
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Daniele Quercia
Popular way:
Inter-context Lifting
Greek Coins
Roman Coins
Coins Chairs
Antiques
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Daniele Quercia
Idea: Users …
> Don’t share ontology
> Extract “features” from their own ratings
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Daniele Quercia
Idea: Users …
> Don’t share ontology
> Extract “features” from their own ratings
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Daniele Quercia
How to extract?
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Daniele Quercia
Singular
Value
Decomposition
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Daniele Quercia
Beauty: features not user-specified
BUT learnt
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Daniele Quercia
Tested on simulation with real parameters
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Daniele Quercia
Tested on Nokia 3230
Max: 3.2 ms !
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Daniele Quercia
What I’ve told you is on “mobblog UCL” (google it)under tag: “bootstrapping”
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Daniele Quercia
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Daniele Quercia
And User Privacy?
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Daniele Quercia
Private filtering(Google for “mobblog private filtering”)
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Daniele Quercia
And Resource Discovery?
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Daniele Quercia
Folksonomy for mobiles
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Daniele Quercia
And Attacks?
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Daniele Quercia
Further Research(join mobblog !)