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SICHERHEIT
2010
13 years 6 months ago
CAPTCHAs: The Good, the Bad, and the Ugly
A CAPTCHA is a program that generates challenges that are easy to solve for humans but difficult to solve for computers. The most common CAPTCHAs today are text-based ones where a ...
Paul Baecher, Marc Fischlin, Lior Gordon, Robert L...
MCM
2011
13 years 3 months ago
The Das-Moser commutator closure for filtering through a boundary is well-posed
When filtering through a wall with constant averaging radius, in addition to the subfilter scale stresses, a non-closed commutator term arises. We consider a proposal of Das and ...
William Layton, Catalin Trenchea
STACS
2007
Springer
14 years 3 months ago
Reachability in Unions of Commutative Rewriting Systems Is Decidable
We consider commutative string rewriting systems (Vector Addition Systems, Petri nets), i.e., string rewriting systems in which all pairs of letters commute. We are interested in r...
Mikolaj Bojanczyk, Piotr Hoffman
KDD
2009
ACM
243views Data Mining» more  KDD 2009»
14 years 9 months ago
Exploiting Wikipedia as external knowledge for document clustering
In traditional text clustering methods, documents are represented as "bags of words" without considering the semantic information of each document. For instance, if two ...
Xiaohua Hu, Xiaodan Zhang, Caimei Lu, E. K. Park, ...
SIGIR
1992
ACM
14 years 29 days ago
Classifying News Stories using Memory Based Reasoning
ct tasks such as extraction of relational information from text [Young] [Jacobs]. We describe a method for classifying news stories using Alternative systems [Biebricher] [Lewis] u...
Brij M. Masand, Gordon Linoff, David L. Waltz