منابع مشابه
On the Complexity and Approximation of the Min-Sum and Min-Max Disjoint Paths Problems
GivenagraphG = (V,E) andk source-sinkpairs{(s1, t1), . . . , (sk, tk)} with each si, ti ∈ V , the Min-Sum Disjoint Paths problem asks k disjoint paths to connect all the source-sink pairs with minimized total length, while the Min-Max Disjoint Paths problem asks also k disjoint paths to connect all source-sink pairs but with minimized length of the longest path. In this paper we show that the w...
متن کاملComplexity and Approximation Results for the Min-Sum and Min-Max Disjoint Paths Problems
Given a graph G = (V,E) and k source-sink pairs {(s1, t1), . . . , (sk, tk)} with each si, ti ∈ V , the Min-Sum Disjoint Paths problem asks to find k disjoint paths connecting all the source-sink pairs with minimized total length, while the Min-Max Disjoint Paths problem asks for k disjoint paths connecting all the sourcesink pairs with minimized length of the longest path. We show that the wei...
متن کاملVariants of the Min-Sum Link-Disjoint Paths Problem
A survivable connection usually requires computing link-disjoint primary and backup paths. Finding a min-sum pair of link-disjoint paths whose total cost is minimized can be solved in polynomial time. However, adding extra requirements may render the problem NP-complete. In this paper, we study different variants of the min-sum link-disjoint paths problem. We examine the complexity of these pro...
متن کاملMin, Max, and Sum
This paper provides characterization theorems for preferences that can be represented by U(x1, ..., xn)=min{xk}, U(x1, ..., xn)=max{xk}, U(x1, ..., xn)=; u(xk), or combinations of these functionals. The main assumption is partial separability, where changing a common component of two vectors does not reverse strict preferences, but may turn strict preferences into indifference. We discuss appli...
متن کاملSimplified 2-Dimensional Scaled Min-Sum Algorithm for LDPC Decoder
Among various decoding algorithms of low-density parity-check (LDPC) codes, the minsum (MS) algorithm and its modified algorithms are widely adopted because of their computational simplicity compared to the sum-product (SP) algorithm with slight loss of decoding performance. In the MS algorithm, the magnitude of the output message from a check node (CN) processing unit is decided by either the ...
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ژورنال
عنوان ژورنال: Theory of Computing Systems
سال: 2014
ISSN: 1432-4350,1433-0490
DOI: 10.1007/s00224-014-9569-1