What is a knowledge portal? A website A User Community Knowledge Repository Knowledg e Exchange.

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What is a knowledge portal? A websit e A User Communit y Knowledge Repository Knowledg e Exchange
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Transcript of What is a knowledge portal? A website A User Community Knowledge Repository Knowledg e Exchange.

What is a knowledge portal?

A website

A User Community

Knowledge Repository

Knowledge Exchange

Example: Wikipedia, and other Wikis

Technology: Wiki for collaborative authoring of hyperlinked texts.

Projects: Wikipedia, MeatBallWiki, WikiNews, WikiTravel, Wiktionary, etc.

• Representation: – primary: hyperlinked texts, like HTML– conflict resolution: discussion pages,

revision history• Size:

– english: 1 Mio. articles/ 1.2 Mio. reg. Users– german: 380.000 articles

Example: OpenCPS, and other Question-Answering

Technology: formatted objects with optional atomic contributions

Projects: Problem-Solving, Question Answering, Forums, etc.

• Representation: – primary: hyperlinked texts, like HTML– conflict resolution: discussion pages, revision history

• Size:– english: 1 Mio. articles/ 1.2 Mio. reg. Users– german: 380.000 articles

Knowledge Sharing Dilemma(Presentation: Roland Müller/ Markus

Schaal)

To share or not to share („Hoarding“) - that is the Question

Two-Player Knowledge Sharing

Actionspace (A) per Player - share (s) or hoard (h)

Reward per Player - reward: A £ A O RI

Rewards for Player A (red)

Player A

Player Breward

hs

s

h

A shares, B hoards (sh),

sh<hh

A hoards, B shares (hs),

hs>ss

A,B share (ss), ss>hh

A,B hoard (hh)

Rewards for Player A (red)

Player A

Player Breward

hs

s

h

Rewards for both Players

Player A

Player Breward

hs

s

h

Equilibrum

Global Optimum

Private vs. Public

Private• Excludes important experts• Bounded number of users• Protects private knowledge• Explicit incentives

Public• All experts included• Many users possible• Public knowledge repository• Needs time for critical mass

Portals• Public Portals

– an encyclopedia, providing a coverage of universal knowledge of interest

– a dictionary, providing translations between languages or explanations of specific terms

– a transport information system, providing the best available route between two doors and starting at a specified time

– an event information system, providing trusted information about events

– a governance information system, providing decision support information concerning public decisions and people objections in a structured argumentation framework

– collaborative authoring of texts• Private Portals are often mission-critical and secret• Vision: Inter-organizational sharing of non-mission

critical knowledge.

How does it work?

• Initial Knowledge Creation:– Private: Paid Experts, Strong Incentives– Public: Altruistic „Idiots“

• Maintenance:– Public: Depends on community size, if

the value is high enough -> self-running, otherwise -> dying, Winner-Takes-All (Natural monopoly)

– Private: Incentives

Trusted Events

„Is“ Analysis:• Event infos everywhere• Some trusted sites and newsletters• Generally not reliable, better call the organizer

„To Be“ Analysis:• Event Information provided by community• Rating system for trusted event information

sources• Automatic federation of trusted sources• „Trusted Events“ as a universal public good

Value vs. Trust• Event Information is rated after the

event, not the event.• Trust Values in [0,1] are computed for

past AND FUTURE events.• The anticipated trust value is shown to

the user.• The trust value can be interpreted as

– probability to take place in the expected manner

– fuzzy membership in „Event takes place as expected“

• NOTE: The trust value is NOT the value of the event information.

„Trusted Events“ – a Senior Design Project

• 4 students, specializing in trust (1), general architecture (1), gui issues (1) and security (1), respectively.

• The rest of this session is organized as follows:– Presentation of the prototype and general

architecture (NN)– Presentation of the trust assissment and

processing (NN)– Presentation of GUI issues and their

consideration during design and in the prototype (NN)

– Presentation of security issues and their consideration during design and in the prototype (NN)