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ECCC
2010
14 years 9 months ago
2010
We consider the reachability problem for a certain class of directed acyclic graphs embedded on surfaces. Let G(m, g) be the class of directed acyclic graphs with m = m(n) source ...
BPM
2010
Springer
15 years 23 days ago
2010
Springer
We propose a new semantics for the inclusive converging gateway (also known as Or-join). The new semantics coincides with the intuitive, widely agreed semantics for Or-joins on sou...
STACS
2010
Springer
15 years 6 months ago
2010
Springer
Reachability and shortest path problems are NL-complete for general graphs. They are known to be in L for graphs of tree-width 2 [14]. However, for graphs of treewidth larger than ...
VLDB
2005
ACM
15 years 5 months ago
2005
ACM
Existing work for query processing over graph data models often relies on pre-computing the transitive closure or path indexes. In this paper, we propose a family of stack-based a...
CORR
2008
Springer
14 years 11 months ago
2008
Springer
Reachability and distance computation are known to be NL-complete in general graphs, but within UL co-UL if the graphs are planar. However, finding longest paths is known to be N...