Branch And Cut Algorithm
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Recoloração convexa de caminhos / Convex recoloring of paths
O foco central desta tese é o desenvolvimento de algoritmos para o problema de recoloração convexa de caminhos. Neste problema, é dado um caminho cujos vértices estão coloridos arbitrariamente, e o objetivo é recolorir o menor número possível de vértices de modo a obter uma coloração convexa. Dizemos que uma coloração de um grafo é convexa se,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/11/2011
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2. Heurísticas e algoritmo exato para o problema de roteamento de veículos com coleta e entrega simultâneas
This work adresses the Vehicle Routing Problem with Simultaneous Pickup and Delivery, where routes must be devised to fulfil the pickup and delivery requests of a set of customers. Each customer must be served by only one route, the load it receives isbrought from a central depot, to where the picked-up load is also taken. The capacity of the used vehicles m
Publicado em: 2010
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3. Algoritmos para problemas de corte e empacotamento / Algorithms for cutting and packing problems
Several versions of Cutting and Packing problems are considered NP-hard and, if we consider that P ¿ NP, we do not have any exact polynomial algorithm for solve them. Practical applications arises for such problems and include: resources allocation for computers; cut of steel, wood, glass, aluminum, etc.; packing of objects; and, loading objects into contai
Publicado em: 2010
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4. A branch-and-cut SDP-based algorithm for minimum sum-of-squares clustering
Clusterização por soma mínima de distâncias quadráticas consiste em particionar um dado conjunto de n pontos em k clusters a fim de minimizar a soma das distâncias quadráticas entre os pontos e o centróide de seus respectivos clusters. Recentemente, Peng & Xia (2005) estabeleceram a equivalência entre o problema e programação semidefinida 0-1. Nes
Pesquisa Operacional. Publicado em: 2009-12
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5. Polyhedral study of the maximum common induced subgraph problem / Estudo poliedral do problema do maximo subgrafo induzido comum
O problema do Máximo Subgrafo Induzido Comum (MSIC) pertence a classe NP-difícil e possui aplicações em diversas áreas. Apesar de sua complexidade, ainda é importante conhecer soluções exatas para instâncias deste problema. Os algoritmos exatos encontrados na literatura buscam resolvê-lo através de técnicas de backtracking ou através de sua redu
Publicado em: 2009
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6. Otimização de índices de confiabilidade em redes de distribuição de energia elétrica
An eletric utility must install protection (reclosers and fuses) and sectionalizing (switches) devices in key points of its distribution network to serve its customers with a reliable power supply. Utility boards or similar commissions define measures (reliability indices) to quantify and analize the eletric utility services. The problem addressed in this wo
Publicado em: 2006
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7. AN ALGORITHM WITH COLUMN AND CUT GENERATION FOR THE CAPACITATED VEHICLE ROUTING PROBLEM / UM ALGORITMO DE GERAÇÃO DE COLUNAS E CORTES PARA O PROBLEMA DE ROTEAMENTO DE VEÍCULOS
The Capacitated Vehicle Routing problem (CVRP) has been one of the most studied problems in the field of Combinatorial Optimization. A straight forward generalization of the popular Travelling Salesperson problem, the CVRP has drawn attention of the most prominent researchers since the early 60`s. One of the most important algorithms appeared in the early 80
Publicado em: 2004
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8. MODELOS E ALGORITMOS PARA O PROBLEMA DE ALOCAÇÃO GENERALIZADA (PAG) E APLICAÇÕES / MODELS AND ALGORITHMS FOR THE GENERALIZED ASSIGNMENT PROBLEM (PAG) AND APPLICATIONS
This dissertation tackles the Generalized Assignment Problem (PAG), models and algorithms are studied and proposed. This work was motivated by a real world application: the Truck Loading Problem (PCC). Research was done on approximated (metaheuristics) and exact algorithm for solving the PAG. The approximated algorithms proposed were based on a recent idea f
Publicado em: 2003
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9. ALGORITHM RELAX-AND-CUT FOR THE 0-1 QUADRATIC KNAPSACK PROBLEM / UM ALGORITMO RELAX-AND-CUT PARA O PROBLEMA QUADRÁTICO DA MOCHILA 0-1
We consider the 0-1 Quadratic Knapsack Problem (QKP), which consists of maximizing a quadratic Boolean function subject to a linear capacity constraint. The problem has applications in several areas such as telecommunications, financial engineering, location problems, graph theory (Max Clique). We propose a Branch-and-Bound algorithm to solve the QKP to opti
Publicado em: 1999
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10. Partição retangular minima de um retangulo em programação linear inteira
Given a rectangle R in the plane and a non empty finite set P of points in the interior of R, we study the problem of partitioning R into smaller rectangles such that no point in P is interior to any rectangle of the partition. The goal is to minimize the sum of the lengths of the straight line segments defining the partition. This problem is NP-hard and a g
Publicado em: 1997