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APPROX
2006
Springer
234views Algorithms» more  APPROX 2006»
14 years 1 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
14 years 3 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»
13 years 9 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
13 years 12 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»
14 years 3 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