*sponsored by Deutsche Telekom AG

Intelligent Networks and Distributed Systems Management*

March, 24th 2003

Towards Trust-based Knowledge Management for Mobile CommunitiesStefan Schulz, Klaus Herrmann, Robert Kalcklösch, Thomas Schwotzer

AAAI Spring Symposium onAgent-mediated Knowledge Management

March 24-26, 2003, Stanford University

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Motivation and ObjectivesRecent 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

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Part 2: Trust Network

Part 1: Agent-based Knowledge Network

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Social Network

Member

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KnowledgeDissemination

KnowledgeReception

Natural Knowledge Management

Sports club

Company Municipal council

MaryPeter

Paul

Hans

Jean

Shareholder

Tennis

Jay Leno

XML

AMKM

Pets

Budget

HomePubOffice

Train

LoudnessDaytime

Notebook

Jacket

Emotion

Mobile

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Relevance and Strategy

KnowledgeDissemination

KnowledgeReception

Strategy

Relevance

Complexity Reduction

Representation

RoleTopic PartnerLocation

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KnowledgeDissemination

KnowledgeReception

Strategy

Relevance

Complexity Reduction

Representation

RoleTopic PartnerLocation

Roles

Role Employee PrivateTopic Product Offer Tennis Match

Relevance Business Interests Personal Interests

Strategy Business Policy Personal Policy

Acting on behalf of a network member

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KnowGents (Knowledge Agents)

Policy andInterest based

Knowledge Exchange

Policy andInterest based

Knowledge Exchange

Mobile Knowledge Exchange by Mobile Devices

Member Place

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Virtual Presence by Mobile Agents

Meet regularlyMeet regularly

DeleGents (Delegate Agents)

Build and Migrate DeleGent

Synchronize

Clone and/or Migrate

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Pattern of Encounter

Meet regularlyMeet regularly

Baseball

4711KM4242Canada3815

Tennis5371Jay Leno

5173AMKM4702

Social Networks are Small Worlds

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Knowledge Network

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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

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Part 2: Trust Network

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Trust in a Social Network

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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

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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 10

hostile friendlyneutral

Level of Trust: f(I,T,C)

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Adjusting Trust: based on Knowledge

Knowledge Transfer

Review

Direct Evaluation of transferred knowledge

Indirect Evaluation by knowledge review

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Adjusting Trust: based on Sharing Trust*

TrustManagement (Member ,

Topic T, Competenceexchanged)

(Member , Topic T, Competenceadjusted)

(Member , Topic T, Competencecurrent)

(Member , Topic “Trust”, Competencecurrent)

*simplified

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Trust Network

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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

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Conclusions and OutlookConcept 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 Schulzschulz@ivs.tu-berlin.deRG Intelligent Networks and Distributed Systems ManagementBerlin University of Technologywww.ivs.tu-berlin.de

This presentation is © Copyright 2003 by iVS, TU-Berlin