10 documents found, page 1 of 1

A GRASP-based multi-objective approach for the tuna purse seine fishing fleet r...

Nowadays, the world’s fishing fleet uses 20% more fuel to catch the same amount of fish compared to 30 years ago. Addressing this negative environmental and economic performance is crucial due to stricter emission regulations, rising fuel costs, and predicted declines in fish biomass and body sizes due to climate change. Investment in more efficient engines, larger ships and better fuel has been the main respon...

Special issue on “Cutting and Packing”

[Excerpt] This special issue, “Cutting and Packing”, of International Transactions in Operational Research (ITOR), focuses on recent advances in Cutting and Packing (C&P) problems and their applications. Continuing a long tradition of special issues on this topic in OR journals that started in 1990 and builds upon ITOR's successful previous editions in 2009 and 2013, this special issue aims to capture the lates...

Cutting and packing problems under uncertainty: literature review and classific...

Cutting and packing problems are hard combinatorial optimization problems that arise in several manufacturing and process industries or in their supply chains. The solution of these problems is not only a scientific challenge but also has a large economic impact, as it contributes to the reduction of one of the major cost factors for many production sectors, namely raw materials, together with a positive enviro...

Modelo integrado de empacotamento de peças irregulares em faixa e caminho mínim...

Packing circles and irregular polygons using separation lines

A general heuristic for two-dimensional nesting problems with limited-size cont...

An innovative data structure to handle the geometry of nesting problems

Made available in DSpace on 2018-12-11T16:50:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-12-17; As in many other combinatorial optimisation problems, research on nesting problems (aka irregular packing problems) has evolved around the dichotomy between continuous (time consuming) and discrete (memory consuming) representations of the solution space. Recent research has been devoting increasing att...

Integrated resolution of assignment, sequencing and cutting problems in paper p...

The integrated planning of several activities implicated in paper production can lead to remarkable gains in terms of raw materials and resource usage. However, activities such as order assignment, production sequencing and cutting planning are usually addressed separately while ignoring the interactions among these processes. But the quality of the solution resulting from the juxtaposition of the partial solut...

Relatório final da actividade do grupo de trabalho para a avaliação das escolas

O Grupo de Trabalho para a Avaliação das Escolas foi constituído por Despacho Conjunto do Ministro de Estado e das Finanças e da Ministra da Educação (Anexo 1.1). A sua primeira reunião ocorreu no dia 11 de Janeiro, no Porto. O primeiro período de actividade do grupo visou, sobretudo, a preparação da fase piloto de avaliação externa, que foi conduzida e concluída até ao final do ano lectivo e que teve duas vert...

A GRASP Approach to the Container Loading Problem

In this paper a new GRASP algorithm for the single Container Loading Problem is presented. The Container Loading Problem aims the packing of a set of boxes into a container, so that the wastes space is minimised and other side constraints related to the physical loading and transportation of the boxes are satisfied. Special attention will be paid to cargo stability issues. This GRASP algorithm is based on a “wa...