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Publicações

Publicações por SYSTEM

2020

Models and algorithms for network design in urban freight distribution systems

Autores
Guimarães, LR; Athayde Prata, BD; De Sousa, JP;

Publicação
Transportation Research Procedia

Abstract
Central areas of large cities offer in general many advantages to their inhabitants. Typically, a large number of products, services, and opportunities are available in those urban zones, thus increasing life quality. Unfortunately, these benefits are associated with increasing transportation activities that can cause serious problems, such as traffic congestion, excessive energy consumption, and pollution. This paper aims at presenting a new transport system that consists of transporting freight in long-haul passenger vehicles. Two mixed integer mathematical programming models are presented: one for total cost minimization and the other for the travel time minimization. The problem under study was considered as a multi-commodity network flow problem with time windows, multi transport-lines, and multiple vehicles. Three heuristics based on mixed integer programming (MIP) were designed to solve it: size reduction, LP-and-fix, and a combination of these two procedures. The proposed approaches were validated in a case study designed around the intercity passenger transport system, in Ceará, Northeast of Brazil. Several operational scenarios were evaluated, taking into account the available freight capacities. The developed MIP heuristics produced high-quality solutions, in reasonable computational times, with the LP-and-Fix algorithm outperforming the other approaches. © 2020 The Authors. Published by Elsevier B.V.

2020

A generic mathematical formulation for two-echelon distribution systems based on mobile depots

Autores
Oliveira, B; Ramos, AG; De Sousa, JP;

Publicação
Transportation Research Procedia

Abstract
The negative impacts of urban logistics have fostered the search for new distribution systems in inner city deliveries. In this context, interesting solutions can be developed around two-echelon distribution systems based on mobile depots (2E-MD), where loads arriving from the periphery of the city are directly transferred, at intermediate locations, from larger to smaller vehicles more suited to operate in the city centre. Four types of 2E-MD can be identified, according to the degree of mobility of larger vehicles and their accessibility to customers. In this paper, we propose a generic three-index arc-based mixed integer programming model, for a two-echelon vehicle routing problem, with synchronisation at the satellites and multi-trips at the second echelon. This generic base model is formulated for the most restrictive type of problems, where larger vehicles visit a a single transfer location and do not perform direct deliveries to customers, but it can be easily extended to address the other types of 2E-MD. The paper presents how these extensions account for the characteristics of the different types of 2E-MD. The generic model, its extensions and the impact of a set of valid inequalities are tested using problem instances adapted from the VRP literature. Results show that the proposed extensions do adequately address the specific features of the different types of 2E-MD, including multiple visits to satellites, and direct deliveries to customers. Nevertheless, the resulting models can only tackle rather small instances, even if the formulations can be strengthened by adding the valid inequalities proposed in the paper. © 2020 The Authors. Published by ELSEVIER B.V.

2020

Exploring the Linkages Between the Internet of Things and Planning and Control Systems in Industrial Applications

Autores
Soares, R; Marques, A; Gomes, R; Guardão, L; Hernández, E; Rebelo, R;

Publicação
Lecture Notes in Mechanical Engineering

Abstract
The potential of the Internet of Things (IoT) and other technologies in the realm of Industry 4.0 to generate valuable data for monitoring the performance of the production processes and the whole supply chain is well established. However, these large volumes of data can be used within planning and control systems (PCSs) to enhance real-time planning and decision-making. This paper conducts a literature review to envisage an overall system architecture that combines IoT and PCS for planning, monitoring and control of operations at the level of an industrial production process or at the level of its supply chain. Despite the extensive literature on IoT implementations, few studies explain the interactions between IoT and the components of PCS. It is expected that, with the increasing digitization of business processes, approaches with PCS and IoT become ubiquitous in the near future. © 2020, Springer Nature Switzerland AG.

2020

Portuguese textile association fostering the internationalisation of small and medium-sized enterprises

Autores
Silva, SCe; Elo, M; Sousa, JPD; Costa, E; Soares, AL;

Publicação
International Journal of Entrepreneurship and Small Business

Abstract

2020

Forming intersectoral partnerships for social innovation in Portugal [O processo de formação de parcerias intersetoriais em iniciativas de inovação social em Portugal]

Autores
Borges, MA; Dandolini, GA; Soares, AL;

Publicação
Analise Social

Abstract
The purpose of this article is to describe the process of forming intersectoral partnerships in social innovation initiatives in Portugal. The methodological approach used was the qualitative study of multiple cases through a triangulated analysis of the data. This resulted in a set of interrelated categories explaining the formation process of the partnerships: formation of the partners, means of identification, motivation of the partners to form the partnership, criteria for forming the partnership, determining factors, facilitators, and training process. We discuss the implications of this process and foment some strategies to support the development of intersectoral partnerships for social innovation initiatives.

2020

Factors influencing the intention of managers to adopt collaborative robots (cobots) in manufacturing organizations

Autores
Simoes, AC; Soares, AL; Barros, AC;

Publicação
JOURNAL OF ENGINEERING AND TECHNOLOGY MANAGEMENT

Abstract
This study identified and characterized the factors influencing managers' intentions to adopt collaborative robots (cobots) in manufacturing companies. Based on a conceptual framework that integrates three technology adoption theories (Diffusion of Innovation, Technology-organization-environment and Institutional theory) and following an exploratory qualitative research design, this paper identifies 39 factors influencing the intention to adopt cobots in three contexts (internal, external and technology). Twelve of these factors are new as contrasted with previous literature. The findings of this study can assist organizations in their process of adoption of cobots and in the development of managerial practices that consider the role of these factors.

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