Results 1  10
of
13
A new approach to the minimum cut problem
 Journal of the ACM
, 1996
"... Abstract. This paper presents a new approach to finding minimum cuts in undirected graphs. The fundamental principle is simple: the edges in a graph’s minimum cut form an extremely small fraction of the graph’s edges. Using this idea, we give a randomized, strongly polynomial algorithm that finds th ..."
Abstract

Cited by 127 (10 self)
 Add to MetaCart
Abstract. This paper presents a new approach to finding minimum cuts in undirected graphs. The fundamental principle is simple: the edges in a graph’s minimum cut form an extremely small fraction of the graph’s edges. Using this idea, we give a randomized, strongly polynomial algorithm that finds the minimum cut in an arbitrarily weighted undirected graph with high probability. The algorithm runs in O(n 2 log 3 n) time, a significant improvement over the previous Õ(mn) time bounds based on maximum flows. It is simple and intuitive and uses no complex data structures. Our algorithm can be parallelized to run in �� � with n 2 processors; this gives the first proof that the minimum cut problem can be solved in ���. The algorithm does more than find a single minimum cut; it finds all of them. With minor modifications, our algorithm solves two other problems of interest. Our algorithm finds all cuts with value within a multiplicative factor of � of the minimum cut’s in expected Õ(n 2 � ) time, or in �� � with n 2 � processors. The problem of finding a minimum multiway cut of a graph into r pieces is solved in expected Õ(n 2(r�1) ) time, or in �� � with n 2(r�1) processors. The “trace ” of the algorithm’s execution on these two problems forms a new compact data structure for representing all small cuts and all multiway cuts in a graph. This data structure can be efficiently transformed into the
Experimental Study of Minimum Cut Algorithms
 PROCEEDINGS OF THE EIGHTH ANNUAL ACMSIAM SYMPOSIUM ON DISCRETE ALGORITHMS (SODA)
, 1997
"... Recently, several new algorithms have been developed for the minimum cut problem. These algorithms are very different from the earlier ones and from each other and substantially improve worstcase time bounds for the problem. We conduct experimental evaluation the relative performance of these algor ..."
Abstract

Cited by 42 (3 self)
 Add to MetaCart
(Show Context)
Recently, several new algorithms have been developed for the minimum cut problem. These algorithms are very different from the earlier ones and from each other and substantially improve worstcase time bounds for the problem. We conduct experimental evaluation the relative performance of these algorithms. In the process, we develop heuristics and data structures that substantially improve practical performance of the algorithms. We also develop problem families for testing minimum cut algorithms. Our work leads to a better understanding of practical performance of the minimum cut algorithms and produces very efficient codes for the problem.
Reliability in Layered Networks with Random Link Failures
"... Abstract—We consider network reliability in layered networks where the lower layer experiences random link failures. In layered networks, each failure at the lower layer may lead to multiple failures at the upper layer. We generalize the classical polynomial expression for network reliability to the ..."
Abstract

Cited by 8 (1 self)
 Add to MetaCart
(Show Context)
Abstract—We consider network reliability in layered networks where the lower layer experiences random link failures. In layered networks, each failure at the lower layer may lead to multiple failures at the upper layer. We generalize the classical polynomial expression for network reliability to the multilayer setting. Using random sampling techniques, we develop polynomial time approximation algorithms for the failure polynomial. Our approach gives an approximate expression for reliability as a function of the link failure probability, eliminating the need to resample for different values of the failure probability. Furthermore, it gives insight on how the routings of the logical topology on the physical topology impact network reliability. We show that maximizing the min cut of the (layered) network maximizes reliability in the low failure probability regime. Based on this observation, we develop algorithms for routing the logical topology to maximize reliability. I.
Experimental Study of Minimum Cut Algorithms
 M.S. DISSERTATION, MIT
, 1997
"... Recently, several new algorithms have been developed for the minimum cut problem that substantially improve worstcase time bounds for the problem. These algorithms are very different from the earlier ones and from each other. We conduct an experimental evaluation of the relative performance of thes ..."
Abstract

Cited by 6 (0 self)
 Add to MetaCart
(Show Context)
Recently, several new algorithms have been developed for the minimum cut problem that substantially improve worstcase time bounds for the problem. These algorithms are very different from the earlier ones and from each other. We conduct an experimental evaluation of the relative performance of these algorithms. In the process, we develop heuristics and data structures that substantially improve practical performance of the algorithms. We also develop problem families for testing minimum cut algorithms. Our work leads to a better understanding of practical performance of the minimum cut algorithms and produces very efficient codes for the problem.
Counting and sampling minimum (s, t)cuts in weighted planar graphs in polynomial time
"... We give an O(nd + n log n) algorithm computing the number of minimum (s, t)cuts in weighted planar graphs, where n is the number of vertices and d is the length of the shortest st path in the corresponding unweighted graph. Previously, Ball and Provan gave a polynomialtime algorithm for unweighte ..."
Abstract

Cited by 4 (2 self)
 Add to MetaCart
(Show Context)
We give an O(nd + n log n) algorithm computing the number of minimum (s, t)cuts in weighted planar graphs, where n is the number of vertices and d is the length of the shortest st path in the corresponding unweighted graph. Previously, Ball and Provan gave a polynomialtime algorithm for unweighted planar graphs with both s and t lying on the outer face. Our results hold for all locations of s and t and weighted graphs, and have direct applications in computer vision.
Counting minimum (s, t)cuts in weighted planar graphs in polynomial time
"... Abstract. We give an O(nd+n log n) algorithm computing the number of minimum (s, t)cuts in weighted planar graphs, where n is the number of vertices and d is the length of the shortest st path in the corresponding unweighted graph. Previously, Ball and Provan gave a polynomialtime algorithm for u ..."
Abstract
 Add to MetaCart
(Show Context)
Abstract. We give an O(nd+n log n) algorithm computing the number of minimum (s, t)cuts in weighted planar graphs, where n is the number of vertices and d is the length of the shortest st path in the corresponding unweighted graph. Previously, Ball and Provan gave a polynomialtime algorithm for unweighted graphs with both s and t lying on the outer face. Our results hold for all locations of s and t and weighted graphs, and have direct applications in image segmentation and other computer vision problems. 1
unknown title
, 2002
"... Network partitioning techniques based on network natural properties for power system application by ..."
Abstract
 Add to MetaCart
Network partitioning techniques based on network natural properties for power system application by
Factoring Algorithm for Counting the Number of (s,t)Mincuts of Each Size
, 1997
"... : An efficient family of methods to evaluate network reliability is the class of factoring algorithms. Their efficiency is due to the use of reliabilitypreserving reductions (for instance, seriesparallel ones). In this work, we follow a similar approach for the problem of counting the (s; t)mincu ..."
Abstract
 Add to MetaCart
: An efficient family of methods to evaluate network reliability is the class of factoring algorithms. Their efficiency is due to the use of reliabilitypreserving reductions (for instance, seriesparallel ones). In this work, we follow a similar approach for the problem of counting the (s; t)mincuts of a graph with size i, for all i. In order to take into account these possible reductions, the paper presents a technique based on a factoring formula, similar to the relation of Moskowitz, to count the number of (s; t)mincuts of each size. This formula is applied recursively and various reductions, with computational cost polynomial in the size of the network, are used in order to reduce the size of the studied graph. Keywords: (s; t)minimal cutset, factoring algorithm, reliabilitypreserving reductions (R'esum'e : tsvp) Email: sbulteau@irisa.fr Unite de recherche INRIA Rennes IRISA, Campus universitaire de Beaulieu, 35042 RENNES Cedex (France) Telephone : (33) 02 99 84 71 00 ...
Reliable Assignments of Processors to Tasks and Factoring on Matroids
, 1993
"... In the simple assignment problem, there are n processors, m tasks, and a relation between the processors and tasks; this relation indicates the ability of the processor to perform the task. When the processors fail independently with known probabilities, two performance issues arise. First, with wha ..."
Abstract
 Add to MetaCart
(Show Context)
In the simple assignment problem, there are n processors, m tasks, and a relation between the processors and tasks; this relation indicates the ability of the processor to perform the task. When the processors fail independently with known probabilities, two performance issues arise. First, with what probability can the operating processors all be kept busy? Second, with what probability can the operating processors perform the same number of tasks that all processors could? We formulate these questions on the underlying transversal matroid. We first prove that counting minimum cardinality circuits in this matroid is #Pcomplete, and hence that both questions are also #Pcomplete. Secondly, we devise a factoring algorithm with series and parallel reductions to compute exact solutions of the above problems. We then outline some efficient strategies for bounding the probabilities. 1 Introduction Consider a multiprocessor system having a set C= c 1 ; c 2 ; : : : ; c n of processors availa...
I R I S a
"... : An efficient family of methods to evaluate network reliability is the class of factoring algorithms. Their efficiency is due to the use of reliabilitypreserving reductions (for instance, seriesparallel ones). In this work, we follow a similar approach for the problem of counting the (s; t)mincu ..."
Abstract
 Add to MetaCart
(Show Context)
: An efficient family of methods to evaluate network reliability is the class of factoring algorithms. Their efficiency is due to the use of reliabilitypreserving reductions (for instance, seriesparallel ones). In this work, we follow a similar approach for the problem of counting the (s; t)mincuts of a graph with size i, for all i. In order to take into account these possible reductions, the paper presents a technique based on a factoring formula, similar to the relation of Moskowitz, to count the number of (s; t)mincuts of each size. This formula is applied recursively and various reductions, with computational cost polynomial in the size of the network, are used in order to reduce the size of the studied graph. Keywords: (s; t)minimal cutset, factoring algorithm, reliabilitypreserving reductions (R'esum'e : tsvp) * Email: sbulteau@irisa.fr CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Centre National de la Recherche Scientifique Institut National de Recherche en Informati...