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Geometric Mesh Partitioning: Implementation and Experiments
"... We investigate a method of dividing an irregular mesh into equalsized pieces with few interconnecting edges. The method’s novel feature is that it exploits the geometric coordinates of the mesh vertices. It is based on theoretical work of Miller, Teng, Thurston, and Vavasis, who showed that certain ..."
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Cited by 103 (19 self)
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We investigate a method of dividing an irregular mesh into equalsized pieces with few interconnecting edges. The method’s novel feature is that it exploits the geometric coordinates of the mesh vertices. It is based on theoretical work of Miller, Teng, Thurston, and Vavasis, who showed that certain classes of “wellshaped” finite element meshes have good separators. The geometric method is quite simple to implement: we describe a Matlab code for it in some detail. The method is also quite efficient and effective: we compare it with some other methods, including spectral bisection.
Analysis of multilevel graph partitioning
, 1995
"... Recently, a number of researchers have investigated a class of algorithms that are based on multilevel graph partitioning that have moderate computational complexity, and provide excellent graph partitions. However, there exists little theoretical analysis that could explain the ability of multileve ..."
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Cited by 91 (13 self)
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Recently, a number of researchers have investigated a class of algorithms that are based on multilevel graph partitioning that have moderate computational complexity, and provide excellent graph partitions. However, there exists little theoretical analysis that could explain the ability of multilevel algorithms to produce good partitions. In this paper we present such an analysis. We show under certain reasonable assumptions that even if no refinement is used in the uncoarsening phase, a good bisection of the coarser graph is worse than a good bisection of the finer graph by at most a small factor. We also show that the size of a good vertexseparator of the coarse graph projected to the finer graph (without performing refinement in the uncoarsening phase) is higher than the size of a good vertexseparator of the finer graph by at most a small factor.
Planar Separators and Parallel Polygon Triangulation
"... We show how to construct an O ( p n)separator decomposition of a planar graph G in O(n) time. Such a decomposition defines a binary tree where each node corresponds to a subgraph of G and stores an O ( p n)separator of that subgraph. We also show how to construct an O(n)way decomposition tree in ..."
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Cited by 53 (8 self)
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We show how to construct an O ( p n)separator decomposition of a planar graph G in O(n) time. Such a decomposition defines a binary tree where each node corresponds to a subgraph of G and stores an O ( p n)separator of that subgraph. We also show how to construct an O(n)way decomposition tree in parallel in O(log n) time so that each node corresponds to a subgraph of G and stores an O(n 1=2+)separator of that subgraph. We demonstrate the utility of such a separator decomposition by showing how it can be used in the design of a parallel algorithm for triangulating a simple polygon deterministically in O(log n) time using O(n = log n) processors on a CRCW PRAM.
Combinatorial preconditioners for sparse, symmetric, diagonally dominant linear systems
, 1996
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A polynomialtime approximation scheme for weighted planar graph TSP
 PROC. 9TH ANNUAL ACMSIAM SYMPOSIUM ON DISCRETE ALGORITHMS, PP 33–41
, 1998
"... Given a planar Rraph on n nodes with costs (weights) on its edges, define;he distance between nodes i &d 2 as ’ the length of the shortest path between i and i. Consider this as &I instance of me & TSP. For any E> 6, our algorithm finds a salesman tour of total cost at most (1 + E) t ..."
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Cited by 51 (13 self)
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Given a planar Rraph on n nodes with costs (weights) on its edges, define;he distance between nodes i &d 2 as ’ the length of the shortest path between i and i. Consider this as &I instance of me & TSP. For any E> 6, our algorithm finds a salesman tour of total cost at most (1 + E) times optimal in time n”(llea). We also present a quasipolynomial time algorithm for the Steiner version of this problem.
An Approximation Scheme for Planar Graph TSP
, 1995
"... We consider the special case of the traveling salesman problem (TSP) in which the distance metric is the shortestpath metric of a planar unweighted graph. We present a polynomialtime approximation scheme (PTAS) for this problem. ..."
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Cited by 49 (7 self)
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We consider the special case of the traveling salesman problem (TSP) in which the distance metric is the shortestpath metric of a planar unweighted graph. We present a polynomialtime approximation scheme (PTAS) for this problem.
Approximation schemes for NPhard geometric optimization problems: A survey
 Mathematical Programming
, 2003
"... NPhard geometric optimization problems arise in many disciplines. Perhaps the most famous one is the traveling salesman problem (TSP): given n nodes in ℜ 2 (more generally, in ℜ d), find the minimum length path that visits each node exactly once. If distance is computed using the Euclidean norm (di ..."
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Cited by 38 (2 self)
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NPhard geometric optimization problems arise in many disciplines. Perhaps the most famous one is the traveling salesman problem (TSP): given n nodes in ℜ 2 (more generally, in ℜ d), find the minimum length path that visits each node exactly once. If distance is computed using the Euclidean norm (distance between nodes (x1, y1) and (x2, y2) is ((x1−x2) 2 +(y1−y2) 2) 1/2) then the problem is called Euclidean TSP. More generally the distance could be defined using other norms, such as ℓp norms for any p> 1. All these are subcases of the more general notion of a geometric norm or Minkowski norm. We will refer to the version of the problem with a general geometric norm as geometric TSP. Some other NPhard geometric optimization problems are Minimum Steiner Tree (“Given n points, find the smallest network connecting them,”), kTSP(“Given n points and a number k, find the shortest salesman tour that visits k points”), kMST (“Given n points and a number k, find the shortest tree that contains k points”), vehicle routing, degree restricted minimum
Approximation Algorithms for Minimum Time Broadcast
 SIAM J. Discrete Math
, 1995
"... This paper deals with the problem of broadcasting in minimum time in the telephone and messagepassing models. Approximation algorithms are developed for arbitrary graphs, as well as for several restricted graph classes. In particular, an O( p n)additive approximation algorithm is given for br ..."
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Cited by 26 (1 self)
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This paper deals with the problem of broadcasting in minimum time in the telephone and messagepassing models. Approximation algorithms are developed for arbitrary graphs, as well as for several restricted graph classes. In particular, an O( p n)additive approximation algorithm is given for broadcasting in general graphs, and an O(log log n= log n) (multiplicative) ratio approximation is given for broadcasting in the open path model. This also results in an algorithm for broadcasting on random graphs (in the telephone and messagepassing models), that yields an O(log log n= log n) approximation with high probability. In addition, the paper presents a broadcast algorithm for graph families with small separators (such as chordal, kouterplanar, boundedface planar and seriesparallel graphs), with approximation ratio proportional to the separator size times log n. Finally, an efficient approximation algorithm is presented for the class of graphs representable as trees of c...
Applications of the crossing number
 Proc. 10th Annual ACM Symp. on Computational Geometry
, 1994
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On ExternalMemory Planar Depth First Search
 Journal of Graph Algorithms and Applications
"... Even though a large number of I/Oefficient graph algorithms have been developed, a number of fundamental problems still remain open. For example, no space and I/Oefficient algorithms are known for depthfirst search or breadthfirst search in sparse graphs. In this paper we present two new re ..."
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Cited by 24 (15 self)
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Even though a large number of I/Oefficient graph algorithms have been developed, a number of fundamental problems still remain open. For example, no space and I/Oefficient algorithms are known for depthfirst search or breadthfirst search in sparse graphs. In this paper we present two new results on I/Oefficient depthfirst search in an important class of sparse graphs, namely undirected embedded planar graphs. We develop a new efficient depthfirst search algorithm and show how planar depthfirst search in general can be reduced to planar breadthfirst search. As part of the first result we develop the first I/Oefficient algorithm for finding a simple cycle separator of a biconnected planar graph. Together with other recent reducibility results, the second result provides further evidence that external memory breadthfirst search is among the hardest problems on planar graphs. 1