*sponsored by Deutsche Telekom AG Intelligent Networks and Distributed Systems Management* March, 24th 2003 Towards Trust-based Knowledge Management for Mobile Communities Stefan Schulz, Klaus Herrmann, Robert Kalcklösch, Thomas Schwotzer AAAI Spring Symposium on Agent-mediated Knowledge Management March 24-26, 2003, Stanford University

Towards Trust-based Knowledge Management for Mobile Communities 2 Motivation and Objectives Recent works and current projects at iVS:  Non-functional aspects in middleware and distributed applications  Assurance of Quality and Features for middleware components  Middleware for intelligent, mobile, spontaneously networked systems  Mobile Multi-Agent Systems (AMETAS, MESHMdl)  Mobile shared knowledge exchange (Shark) Goal for sharing knowledge with Shark:  Support mobile communities in knowledge management  Makes use of physical mobility of community members Objectives for agent-based concept:  Overcome the restriction on physical mobility in Shark  Support valuation of knowledge  Integration of/to natural social behavior of individuals

Towards Trust-based Knowledge Management for Mobile Communities 3 Part 2: Trust Network Part 1: Agent-based Knowledge Network

Towards Trust-based Knowledge Management for Mobile Communities 4 Social Network Member

Towards Trust-based Knowledge Management for Mobile Communities 5 Knowledge Dissemination Knowledge Reception Natural Knowledge Management Sports club Company Municipal council Mary Peter Paul Hans Jean Shareholder Tennis Jay Leno XML AMKM Pets Budget Home PubOffice Train Loudness Daytime Notebook Jacket Emotion Mobile

Towards Trust-based Knowledge Management for Mobile Communities 6 Relevance and Strategy Knowledge Dissemination Knowledge Reception Strategy Relevance Complexity Reduction Representation Role Topic Partner Location

Towards Trust-based Knowledge Management for Mobile Communities 7 Knowledge Dissemination Knowledge Reception Strategy Relevance Complexity Reduction Representation Role Topic Partner Location Roles RoleEmployeePrivate TopicProduct OfferTennis Match RelevanceBusiness InterestsPersonal Interests StrategyBusiness PolicyPersonal Policy Acting on behalf of a network member

Towards Trust-based Knowledge Management for Mobile Communities 8 KnowGents (Knowledge Agents) Policy and Interest based Knowledge Exchange Policy and Interest based Knowledge Exchange Mobile Knowledge Exchange by Mobile Devices Member Place

Towards Trust-based Knowledge Management for Mobile Communities 9 Virtual Presence by Mobile Agents Meet regularly DeleGents (Delegate Agents) Build and Migrate DeleGent Synchronize Clone and/or Migrate

Towards Trust-based Knowledge Management for Mobile Communities 10 Pattern of Encounter Meet regularly Baseball4711 KM4242 Canada3815 Tennis5371 Jay Leno 5173 AMKM4702 Social Networks are Small Worlds

Towards Trust-based Knowledge Management for Mobile Communities 11 Knowledge Network

Towards Trust-based Knowledge Management for Mobile Communities 12 Summary: Agent-based Knowledge Network  KnowGents  Reflect members of a social network  Provide interface to define Relevance and Strategy for Contexts  DeleGents  Virtual presence of network members  Reflect members acting on behalf of others  Knowledge Network  By filtered agent communication  By strategic agent placement applying Pattern of Encounter

Towards Trust-based Knowledge Management for Mobile Communities 13 Part 2: Trust Network

Towards Trust-based Knowledge Management for Mobile Communities 14 Trust in a Social Network

Towards Trust-based Knowledge Management for Mobile Communities 15 Marsh 1994 Basic Trust Specific Trust Contextual Trust Trust: Valuation of relations between Members Basic Trust > Initial Trust Specific Trust > Trustability Contextual Trust > Competence Marsh 1994 > Knowledge

Towards Trust-based Knowledge Management for Mobile Communities 16 Basic Trust > Initial Trust Specific Trust > Trustability Contextual Trust > Competence Marsh 1994 > Knowledge Level of Trust Initial Trust I: c Trustability T: f(member) Competence C: f(member, topic) 1 0 hostilefriendlyneutral Level of Trust: f(I,T,C)

Towards Trust-based Knowledge Management for Mobile Communities 17 Adjusting Trust: based on Knowledge Knowledge Transfer Review Direct Evaluation of transferred knowledge Indirect Evaluation by knowledge review

Towards Trust-based Knowledge Management for Mobile Communities 18 Adjusting Trust: based on Sharing Trust * Trust Management (Member , Topic T, Competence exchanged ) (Member , Topic T, Competence adjusted ) (Member , Topic T, Competence current ) (Member , Topic “Trust”, Competence current ) * simplified

Towards Trust-based Knowledge Management for Mobile Communities 19 Trust Network

Towards Trust-based Knowledge Management for Mobile Communities 20 Summary: Trust Network  Level of Trust  Valuation of social relations  Function on Initial Trust, Trustability, and Competence  Adjustment of Trust  Evaluation on transfer and by review  Exchange of trust  Trust Network  Propagation of trust by exchange and DeleGents  Overall statistical trust

Towards Trust-based Knowledge Management for Mobile Communities 21 Conclusions and Outlook Concept for trust-based mobile knowledge management support:  Judging sources and knowledge  Strategies for communication and virtual presence placement  Agents support propagation of trust On-going and future aspects:  Investigation/Simulation: knowledge distribution in mobile networks  Refinement/Adaptation of Level of Trust approach  Conflict resolution for strategies and judgement (e.g., for hierarchies)  “Fuzzy” Trust Management (e.g., Neural Networks, CBR, …)  (Integration of) Automated document decision  (Integration of) Automated context recognition

Thank You! Stefan Schulz RG Intelligent Networks and Distributed Systems Management Berlin University of Technology This presentation is © Copyright 2003 by iVS, TU-Berlin