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APPROX
2006
Springer
234views Algorithms» more  APPROX 2006»
15 years 8 months ago
Constant-Factor Approximation for Minimum-Weight (Connected) Dominating Sets in Unit Disk Graphs
For a given graph with weighted vertices, the goal of the minimum-weight dominating set problem is to compute a vertex subset of smallest weight such that each vertex of the graph...
Christoph Ambühl, Thomas Erlebach, Matú...
COMPGEOM
2006
ACM
15 years 11 months ago
Minimum-cost coverage of point sets by disks
We consider a class of geometric facility location problems in which the goal is to determine a set X of disks given by their centers (tj) and radii (rj) that cover a given set of...
Helmut Alt, Esther M. Arkin, Hervé Brö...
DCG
1998
80views more  DCG 1998»
15 years 4 months ago
Fitting a Set of Points by a Circle
Given a set of points S = fp1; : : : ; png in Euclidean d-dimensional space, we address the problem of computing the d-dimensional annulus of smallest width containing the set. We...
Jesus Garcia-Lopez, Pedro A. Ramos, Jack Snoeyink
CIE
2008
Springer
15 years 7 months ago
Perfect Local Computability and Computable Simulations
We study perfectly locally computable structures, which are (possibly uncountable) structures S that have highly effective presentations of their local properties. We show that eve...
Russell Miller, Dustin Mulcahey
VLDB
2004
ACM
96views Database» more  VLDB 2004»
15 years 10 months ago
Answering XPath Queries over Networks by Sending Minimal Views
When a client submits a set of XPath queries to a XML database on a network, the set of answer sets sent back by the database may include redundancy in two ways: some elements may...
Keishi Tajima, Yoshiki Fukui