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Reusing optimal TSP solutions for locally modified input instances

by Luca Forlizzi, Joachim Kneis, Joachim Kupke, Guido Proietti, Peter Widmayer - In Proc. Fourth IFIP International Conference on Theoretical Computer Science (TCS , 2006
"... Abstract. Given an instance of an optimization problem together with an optimal solution, we consider the scenario in which this instance is modified locally. In graph problems, e. g., a singular edge might be removed or added, or an edge weight might be varied, etc. For a problem U and such a local ..."
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Abstract. Given an instance of an optimization problem together with an optimal solution, we consider the scenario in which this instance is modified locally. In graph problems, e. g., a singular edge might be removed or added, or an edge weight might be varied, etc. For a problem U and such a

On the Approximability of TSP on Local Modifications of Optimally Solved Instances

by Hans-joachim Böckenhauer A, Luca Forlizzi B, Juraj Hromkovic ̌ C, Joachim Kneis D, Joachim Kupke E, Guido Proietti B F, Peter Widmayer G, Luca Forlizzi
"... Given an instance of TSP together with an optimal solution, we consider the scenario in which this instance is modified locally, where a local modification consists in the alteration of the weight of a single edge. More generally, for a problem U, let LM-U (local-modification-U) denote the same prob ..."
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Given an instance of TSP together with an optimal solution, we consider the scenario in which this instance is modified locally, where a local modification consists in the alteration of the weight of a single edge. More generally, for a problem U, let LM-U (local-modification-U) denote the same

Reoptimization of the Metric Deadline TSP (Extended Abstract)

by Hans-Joachim Böckenhauer, Dennis Komm , 2008
"... The reoptimization version of an optimization problem deals with the following scenario: Given an input instance together with an optimal solution for it, the objective is to find a high-quality solution for a locally modified instance. In this paper, we investigate several reoptimization variants ..."
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The reoptimization version of an optimization problem deals with the following scenario: Given an input instance together with an optimal solution for it, the objective is to find a high-quality solution for a locally modified instance. In this paper, we investigate several reoptimization variants

Object/relational query optimization with chase

by Lucian Popa
"... and backchase ..."
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and backchase

Approximation Hardness of the Traveling Salesman Reoptimization Problem

by Richard Královič, Tobias Mömke , 2007
"... In TSP reoptimization, a complete weighted graph and an optimal Hamiltonian tour are given; the problem is to find an optimal solution for a locally modified input. In this paper, we consider the local modification where one edge of the graph becomes cheaper. We show that the best approximation rati ..."
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In TSP reoptimization, a complete weighted graph and an optimal Hamiltonian tour are given; the problem is to find an optimal solution for a locally modified input. In this paper, we consider the local modification where one edge of the graph becomes cheaper. We show that the best approximation

1 Optimal Deterministic Polynomial-Time Data Exchange for Omniscience

by Nebojsa Milosavljevic, Sameer Pawar, Salim El Rouayheb, Michael Gastpar, Kannan Ramchandran
"... ar ..."
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Abstract not found

CERTIFICATE OF APPROVAL

by Yunlong Liu, Yunlong Liu, Erwei Bai, Mona K. Garvin, Hantao Zhang , 2014
"... Treatment plan optimization for rotating-shield brachytherapy ..."
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Treatment plan optimization for rotating-shield brachytherapy

DOI 10.1007/s00778-012-0302-x SPECIAL ISSUE PAPER Automating the database schema evolution process

by Carlo Curino, Hyun Jin, Moon Alin Deutsch, Carlo Zaniolo, C. Curino (b, H. J. Moon, A. Deutsch, C. Zaniolo
"... Abstract Supporting database schema evolution repre-sents a long-standing challenge of practical and theoretical importance for modern information systems. In this paper, we describe techniques and systems for automating the critical tasks of migrating the database and rewriting the legacy applicati ..."
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legacy queries and updates under schema and integrity constraints evolution. The PRISM/PRISM++ approach consists in providing the users with a set of SQL-based Schema Modification Opera-tors (SMOs), which describe how the tables in the old schema are modified into those in the new schema. In order to sup

22.10.2009 Implementation of a Peer-to-Peer Multiplayer Game with Realtime Requirements

by Gutachten Alej, Ro Buchmann
"... Massively multiplayer online games (MMOGs) have become increasingly popular in the recent years, particularly in the form of online role-playing games (MMORPGs). These games support up to several ten thousand players interacting in a virtual game world. The current commercially successful games are ..."
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is selected for implementation with Planet π4. Planet π4 is improved in several aspects for the purpose of analyzing various network implementations. First, its architecture is restructured and cleaned to allow for an easy replacement of the networking component. Second, its core is modified to work in a

Guaranteeing Communication Quality in Real World WSN Deployments

by Fbk-irst Bruno, Kessler Foundation, Matteo Ceriotti, Dr. Amy, L. Murphy, Bruno Kessler Foundation (fbk-irst, Amy L. Murphy, Prof Prabal Dutta, Prof Koen Langendoen, Prof Leo Selavo
"... April 29, 2011Für UnsShe had never before seen a rabbit with either a waistcoat-pocket, or a watch to take out of it, and burning with curiosity, she ran across the field after it Lewis CarrollThe following document, written under the supervision of Dr. reviewed by: ..."
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April 29, 2011Für UnsShe had never before seen a rabbit with either a waistcoat-pocket, or a watch to take out of it, and burning with curiosity, she ran across the field after it Lewis CarrollThe following document, written under the supervision of Dr. reviewed by:
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