Download Diapositive 1

Un peu de recherche…
LIRIS/DCS/DRIM
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Nostalgia: an overview of the past
10 years
• Some contributions to the management of data
in grids
• Some contributions to Pervasive/Ubiquitous
Systems… and other distributed systems (incl.
security and privacy)
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Some contributions to the
management of data in grids
Computing/Data Grid (1)
“coordinated resource sharing and problem
solving in dynamic, multi-institutional virtual
organisations” (I. Foster)
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Computing/Data Grids (2)
• Large scale
• Unpredictability, dynamicity
• Security, privacy
• Resource heterogeneity and usage diversity
• Decentralized administration
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Monitoring de grilles
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Where to place instances (replicas) of a service?
What resource (set of resources) (what service) use?
Condition: monitor the grid state: CPU load, network load…
Design and implementation of a grid service that processes highlevel information requests that represent the user’s specific needs in
terms of resources
Temps de rapatriement
1,00E+08
1,00E+07
1,00E+06
1,00E+05
Réplica A
Réplica B
Réplica C
1
10
100
1000
10000
Taille Donnée
100000
1000000
10000000
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NDS : Network Distance Service
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Grid access control: Sygn
• Permission =
Authorization
Certificate (AC) :
Mechanisms for delegation of rights
File group operations
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–
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Issuer
Owner
Capability (access
control object +
authorized action)
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Validity
–
Signature
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Encrypted Storage for Data Grids: Crypstore
10
10
Management of a Cooperative Cache in Grids
Monitoring operations
• data description
• processed requests
• transfers
• replacements
• used storage resource
• Etc.
organization
cache
data
organization
cache
GRID
cache
Collective
Coordinator
cache
Management operations
• Set replacement method
• Set default time to live
• Set cache group
• Set cache coordinator
• Set collective work mode
• Etc.
data
organization
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Data Integration
Correspondance
négociée
Médiateur
négociateur
Registre de
services
de données
Médiateur
négociateur
Registre de
services
de données
Zones de négociation
imbriquées
Base
de
correspondances
Base
de
correspondances
DS
DS
DS
DS
DS
DS : Data Service
(service de données)
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Some Contributions to
Pervasive/Ubiquitous Systems… and
Other Distributed Systems
(incl. Security and Privacy)
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Pervasive, Ubiquitous, Mobile,
Ambient, Ad Hoc ?
• Introduction to pervasive systems
• Hansel and Gretel are lost in the forest of PC definitions…
• Basics (1)
– Mobility (wireless) / autonomy
– User (or device)-centric
– Context-awareness (user prefs, environment)
• Basics (2)
– Lightweight appliances and devices
– Proactivity
 Make the digital world/information omnipresent but invisible
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PerSE
•Context-Awareness
•Proactivity
•Service Composition
context
Models
Adaptation
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Architecture of a PerSE Base
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PerSE Layers
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Context Modeling and
Context-Aware Pervasive Applications
•
•
•
Context = ?
User/Application centric context
Context-aware application platform
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Access Control of Mobile Users
• Chains of trust certificates: if A trusts B and B trusts C
then A trusts C… to some level
• Multi-layered adaptive certificates
• Trust computing and reputation
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Privacy-Preserving Reputation Systems
• Reputation: aggregation of feedbacks
• Query agent, target agent, source agents
• Goal: computing the reputation while not revealing the
individual feedbacks
• Approach: use trust relations in the reputation protocol
for enforce the privacy + “cut” feedbacks into pieces
(“shares”) + use cryptographic tools
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Authentication and Trust in Pervasive Systems
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Mobile Requests
• Information exchange between mobile peers (MANETs,
VANETs)
• Trajectory aware geocast request routing
• Construction for each query of an ad hoc overlay of the
peers that may participate to the delivery of the
requested data
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Data Replication in Small Worlds
Server
Original
content
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Replication in Ad Hoc Networks
• Issues: instability, dynamicity, faults/disconnections
• Basic idea: adapt the replication heuristics to the actual usage of the
data, e.g.:
–
–
–
–
Data highly accessed => replicate
Rare data and planned disconnection => replicate
Overloaded peer => replicate most accessed data
Etc.
• Pre-requisite: access logging + exchange of access data
• Assumption: no central coordination – local decisions
• Question : can local decisions lead to an acceptable (good ?) situation ?
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Interface Adaptation and Context-Aware Browsing
of a Patient Medical Record
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Multimedia Content Adaptation
+ Adaptation of the interface wrt the end-user device
Ongoing : Content Adaptation in MANETs
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Semantic Protection of Multimedia Data
• Multimedia => access control is not a binary decision
• Access control <=> content adaptation
• Coherence/Consistence of an adaptation
• Legality of an adaptation
=> Access control = semantic adaptation decision
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Semantic Clustering of Multimedia Queries: From Query
Logging to Database Content and User Profile Discovery
• Large number of data stores disseminated
• Lack of indexes
• Issues :
– What are the pertinent/interesting data ?
– What are the users interest ?
– How to process a query ?
• Logging of the users’ queries + clustering + communication of
clustering info => identification of the community of users’ interests
• Logging of a the queries issued by a specific user + matching to the
community clustering => identification of the user’s profile
• Usage: query optimization, data store management,
recommendation, social computing, etc.
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BAR-Tolerant
Publish-subscribe P2P Systems
Collaboration Modeling and Enhancing: a Game
Theoretical Approach
• Byzantine-Altruistic-Rational
• Publish an information; disseminate the information to
subscribers
• Systems benchmarking tool
• GT modeling of collaborative systems
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Ambient Social Networks and
Message Routing in DTN
• Ambient social networks
• Delay Tolerant Networks (DTN) and
Opportunistic Networks
• Mobility traces/model
• Message routing
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Ongoing work:
User-centric Ubiquitous Multi-Scale
Digital Ecosystems
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Information retrieval in P2P systems
Privacy-preserving personal data mining (EEXCESS project)
Privacy-preserving recommendation systems (EEXCESS project)
Privacy-preserving multimedia data routing
Open data and user-as-sensor based ambient social services
Game-theory-based cooperation modeling and enhancing in distributed systems
Trust and reputation in B2B networks (AttestationLegale)
Information protection in clouds
Social-aware event driven architectures
Mobile Crowd Sourcing, Sensing, and Computing: Intelligence, Aggregation, Resilience
(if opportunity) Adaptive and information value-based protection of business processes
(if opportunity) Security of the social web of things
???
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Faites de la recherche
(au moins un peu)
!
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