Is there any repository of unsolved problems?

Hello!
I'm seeking for a good topic for my Ph.D. research in the Semantic Web
field. Would you mind to help me to find the place where I can see the
list of unsolved problems? I don't necessarily mean the list of Ph.D.
topics :) , but that could probably be the list of current directions
where the help is needed and where many questions are opened.


--
Sincerely yours,

Yury V. Katkov
Laboratory of intelligent systems
of the Saint-Petersburg National University of Information
Technologies, Mechanics and Optics, Russia
http://ailab.ifmo.ru

Received on Monday, 7 March 2011 21:54:59 UTC