What is a knowledge portal? A website A User Community 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.
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)
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)