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Publicações

2020

Dynamic Production Order Allocation for Distributed Additive Manufacturing

Autores
Agostino, IRS; Frazzon, EM; Alcala, SGS; Basto, JP; Rodriguez, CMT;

Publicação
IFAC PAPERSONLINE

Abstract
Distributed manufacturing systems represent a new paradigm in the industrial context, supported by new technologies provided by industry 4.0. In this paper, a model for dynamic allocation of Production Orders (PO) in the context of distributed additive manufacturing systems is proposed. The scheduling model performs a local optimization of PO allocation considering a production times forecasting model, fed by system state data obtained by means of an IoT platform, and transportation real-time data. A simulation-based experiment was conducted in a test case with real and simulated data collected from an elevator spare parts provider in Brazil. A significant reduction of 77.94% of the Average Waiting Time (AWT) was obtained, allowing for an increased efficiency of the additive manufacturing system, which supports the forthcoming pilot application. Copyright (C) 2020 The Authors.

2020

Trust model for a multi-agent based simulation of local energy markets

Autores
Andrade, R; Pinto, T; Praça, I;

Publicação
Communications in Computer and Information Science

Abstract
This paper explores the concept of the Local Energy Market and, in particular, the need for Trust in the negotiations necessary for this type of market. A multi-agent system is implemented to simulate the Local Energy Market, and a Trust model is proposed to evaluate the proposals sent by the participants, based on forecasting mechanisms that try to predict the expected behavior of the participant. A case study is carried out with several participants who submit false negotiation proposals to assess the ability of the proposed Trust model to correctly evaluate these participants. The results obtained demonstrate that such an approach has the potential to meet the needs of the local market. © Springer Nature Switzerland AG 2020.

2020

Prosumer Flexibility: A Comprehensive State-of-the-Art Review and Scientometric Analysis

Autores
Gough, M; Santos, SF; Javadi, M; Castro, R; Catalao, JPS;

Publicação
ENERGIES

Abstract
There is a growing need for increased flexibility in modern power systems. Traditionally, this flexibility has been provided by supply-side technologies. There has been an increase in the research surrounding flexibility services provided by demand-side actors and technologies, especially flexibility services provided by prosumers (those customers who both produce and consume electricity). This work gathers 1183 peer-reviewed journal articles concerning the topic and uses them to identify the current state of the art. This body of literature was analysed with two leading textual and scientometric analysis tools, SAS (c) Visual Text Analytics and VOSviewer, in order to provide a detailed understanding of the current state-of-the-art research on prosumer flexibility. Trends, key ideas, opportunities and challenges were identified and discussed.

2020

Optimizing Charging Infrastructures of Electric Bus Routes to Minimize Total Ownership Cost

Autores
Lotfi, M; Pereira, P; Paterakis, N; Gabbar, HA; Catalao, JPS;

Publicação
2020 20TH IEEE INTERNATIONAL CONFERENCE ON ENVIRONMENT AND ELECTRICAL ENGINEERING AND 2020 4TH IEEE INDUSTRIAL AND COMMERCIAL POWER SYSTEMS EUROPE (EEEIC/I&CPS EUROPE)

Abstract
Electrification of public transport systems has become a strategic priority due to the highly versatile potential of electric vehicles (EVs) as distributed energy resources (DERs) Despite the logistic ease of transitioning conventional public transport systems to fully-electric ones, the latter must be properly designed to adhere to technical constraints and minimize their total ownership cost (TOC). Most published work addresses this issue with a narrow scope, such as modeling a very specific case study, leading to non-generic models which are difficult to apply for a universal case. In this study, a mixed-integer linear programming (MILP) model is formulated to model a generic public transport network, comprising the routes, electric bus models, and charging infrastructures. The objective function minimizes the TOC of a generic network, which can be applied to any universal case study. The constructed model is tested by simulating a system with different routes, bus models, and types of chargers to obtain the optimal configuration of the charging infrastructure.

2020

On energy debt: managing consumption on evolving software

Autores
Couto, M; Maia, D; Saraiva, J; Pereira, R;

Publicação
TechDebt@ICSE

Abstract
This paper introduces the concept of energy debt: a new metric, reflecting the implied cost in terms of energy consumption over time, of choosing a flawed implementation of a software system rather than a more robust, yet possibly time consuming, approach. A flawed implementation is considered to contain code smells, known to have a negative influence on the energy consumption. Similar to technical debt, if energy debt is not properly addressed, it can accumulate an energy "interest". This interest will keep increasing as new versions of the software are released, and eventually reach a point where the interest will be higher than the initial energy debt. Addressing the issues/smells at such a point can remove energy debt, at the cost of having already consumed a significant amount of energy which can translate into high costs. We present all underlying concepts of energy debt, bridging the connection with the existing concept of technical debt and show how to compute the energy debt through a motivational example.

2020

A projeção mural multimédia como formação cultural e democrática no espaço público

Autores
Fernandes-Marcos, A; Perez, P; Fernandes-Marcos, A;

Publicação
Texto Digital

Abstract
A projeção mural multimédia é hoje comumente utilizada para fins puramente publicitários ou lúdicos, de entretinimento, no âmbito de eventos que convoquem grandes aglomerados de públicos, sendo menos usual os fins culturais e educacionais. Neste artigo vamos apresentar, analisar e discutir o recurso à projeção mural multimédia em espaços públicos, com objetivos educacionais, formação cultural e de interpelação artística, tomando como tema do conteúdo projetado a própria arte contemporânea e o pensamento crítico que lhe está associado. O artigo toma como base de reflexão os cenários de arte experimental do projeto "+ PROJECTION AC - Projeção da arte contemporânea no espaço público” e suas múltiplas instanciações em diversos locais onde a projeção mural multimédia foi colocada em prática.

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