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About

Professor at FEUP - Faculdade de Engenharia da Universidade do Porto, Departamento de Engenharia e Gestão Industrial Researcher at INESC TEC

Interest
Topics
Details

Details

010
Publications

2022

A Two-Stage Method to Solve Location-Routing Problems Based on Sectorization

Authors
Teymourifar, A; Rodrigues, AM; Ferreira, JS; Lopes, C; Oliveira, C; Romanciuc, V;

Publication
Innovations in Industrial Engineering - Lecture Notes in Mechanical Engineering

Abstract

2022

An Integer Programming Approach to Sectorization with Compactness and Equilibrium Constraints

Authors
Romanciuc, V; Lopes, C; Teymourifar, A; Rodrigues, AM; Ferreira, JS; Oliveira, C; Ozturk, EG;

Publication
Innovations in Industrial Engineering - Lecture Notes in Mechanical Engineering

Abstract

2022

A Comparison Between Optimization Tools to Solve Sectorization Problem

Authors
Teymourifar, A; Rodrigues, AM; Ferreira, JS; Lopes, C;

Publication
Lecture Notes in Networks and Systems

Abstract
In sectorization problems, a large district is split into small ones, usually meeting certain criteria. In this study, at first, two single-objective integer programming models for sectorization are presented. Models contain sector centers and customers, which are known beforehand. Sectors are established by assigning a subset of customers to each center, regarding objective functions like equilibrium and compactness. Pulp and Pyomo libraries available in Python are utilised to solve related benchmarks. The problems are then solved using a genetic algorithm available in Pymoo, which is a library in Python that contains evolutionary algorithms. Furthermore, the multi-objective versions of the models are solved with NSGA-II and RNSGA-II from Pymoo. A comparison is made among solution approaches. Between solvers, Gurobi performs better, while in the case of setting proper parameters and operators the evolutionary algorithm in Pymoo is better in terms of solution time, particularly for larger benchmarks. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

2021

A Comparison Between Simultaneous and Hierarchical Approaches to Solve a Multi-Objective Location-Routing Problem

Authors
Teymourifar, A; Rodrigues, AM; Ferreira, JS;

Publication
AIRO Springer Series - Graphs and Combinatorial Optimization: from Theory to Applications

Abstract

2021

Using variable neighbourhood descent and genetic algorithms for sequencing mixed-model assembly systems in the footwear industry

Authors
Sadeghi, P; Rebelo, RD; Ferreira, JS;

Publication
Operations Research Perspectives

Abstract
This paper addresses a new Mixed-model Assembly Line Sequencing Problem in the Footwear industry. This problem emerges in a large company, which benefits from advanced automated stitching systems. However, these systems need to be managed and optimised. Operators with varied abilities operate machines of various types, placed throughout the stitching lines. In different quantities, the components of the various shoe models, placed in boxes, move along the lines in either direction. The work assumes that the associated balancing problems have already been solved, thus solely concentrating on the sequencing procedures to minimise the makespan. An optimisation model is presented, but it has just been useful to structure the problems and test small instances due to the practical problems’ complexity and dimension. Consequently, two methods were developed, one based on Variable Neighbourhood Descent, named VND-MSeq, and the other based on Genetic Algorithms, referred to as GA-MSeq. Computational results are included, referring to diverse instances and real large-size problems. These results allow for a comparison of the novel methods and to ascertain their effectiveness. We obtained better solutions than those available in the company. © 2021 The Authors

Supervised
thesis

2021

Vehicle allocation In logistic processes

Author
Gustavo Macedo Torres

Institution
UP-FEUP

2019

Modelos integrados de otimização/simulação para balanceamento de linhas de produção e alocação dinâmica de recursos

Author
Francisca Carvalho Pereira

Institution
UP-FEUP

2019

Planeamento de Rotas no Transporte de Alimentos em Projetos de Solidariedade Social

Author
Henrique Daniel Martins Correia

Institution
UP-FEUP

2019

Setorização no Desenho de Rotas - aplicação ao transporte de utentes não urgentes entre as suas residências e um centro hospitalar

Author
Tiago Gaspar Pereira

Institution
UP-FEUP

2019

Abordagens híbridas de "machine learning"/simulação para sistemas logísticos dinâmicos

Author
Vitor Hugo de Sousa Carneiro

Institution
UP-FEUP