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Publicações

2019

On How to Build a Curriculum of an e-Business Master Course

Autores
Azevedo, A; Pinto, AS; Malta, M;

Publicação
PROCEEDINGS OF THE 16TH INTERNATIONAL JOINT CONFERENCE ON E-BUSINESS AND TELECOMMUNICATIONS, VOL 1: DCNET, ICE-B, OPTICS, SIGMAP AND WINSYS (ICETE)

Abstract
The Business School of the Polytechnic of Porto, Portugal aiming at following the demands of the region decided to make available a master's degree program in e-business. This paper describes the study held ascertain the most relevant skills to be considered in the master program. In order to obtain relevant feedback, an interview was conducted to professionals working in the field. Also, a questionnaire was applied to the students attending the last year of undergraduate after working programs, since they have already professional experience in related fields. The most relevant skills were identified, and curriculum was defined for the master's degree according to the analysis of the results of these activities.

2019

História, escolas e movimentos dos indicadores culturais

Autores
Martins, TC; Gomes de Azevedo Pinto, MM;

Publicação
Políticas Culturais em Revista

Abstract
A literatura dos indicadores culturais  reconhece-os como o membro mais novo da família dos indicadores. Na perspectiva de entender como ocorre a sua conceituação e aplicação na realidade social, procura-se compreender  a sua história à luz das escolas e movimentos em torno do tema. Para tanto, problematiza-se esse percurso a partir de agentes, instituições, temporalidades e intencionalidades na definição e uso dos indicadores. Conclui-se com a apresentação dos resultados da pesquisa exploratória realizada, envolvendo o levantamento bibliográfico e documental,  nomeadamente um <em>framework</em> das linhas de atuação e os expoentes de investigação e uso dos indicadores culturais.

2019

Contrasting logical sequences in multi-relational learning

Autores
Ferreira, CA; Gama, J; Costa, VS;

Publicação
PROGRESS IN ARTIFICIAL INTELLIGENCE

Abstract
In this paper, we present the BeamSouL sequence miner that finds sequences of logical atoms. This algorithm uses a levelwise hybrid search strategy to find a subset of contrasting logical sequences available in a SeqLog database. The hybrid search strategy runs an exhaustive search, in the first phase, followed by a beam search strategy. In the beam search phase, the algorithm uses the confidence metric to select the top k sequential patterns that will be specialized in the next level. Moreover, we develop a first-order logic classification framework that uses predicate invention technique to include the BeamSouL findings in the learning process. We evaluate the performance of our proposals using four multi-relational databases. The results are promising, and the BeamSouL algorithm can be more than one order of magnitude faster than the baseline and can find long and highly discriminative contrasting sequences.

2019

Optimal Prosumer Scheduling in Transactive Energy Networks Based on Energy Value Signals

Autores
Lotfi, M; Monteiro, C; Javadi, MS; Shafie khah, M; Catalao, JPS;

Publicação
2019 2ND INTERNATIONAL CONFERENCE ON SMART ENERGY SYSTEMS AND TECHNOLOGIES (SEST 2019)

Abstract
We present a novel fully distributed strategy for joint scheduling of consumption and trading within transactive energy networks. The aim is maximizing social welfare, which itself is redefined and adapted for peer-to-peer prosumer-based markets. In the proposed scheme, hourly energy values are calculated to coordinate the joint scheduling of consumption and trading, taking into consideration both preferences and needs of all network participants. Electricity market prices are scaled locally based on hourly energy values of each prosumer. This creates a system where energy consumption and trading are coordinated based on the value of energy use throughout the day, rather than only the market price. For each prosumer, scheduling is done by allocating load (consumption) and supply (trading) blocks, maximizing the energy value globally and locally within the network. The proposed strategy was tested using a case study of typical residential prosumers. It was shown that the proposed model could provide potential benefits for both prosumers and the grid, albeit with a user-centered, fully distributed management model which relies solely on local scheduling in transactive energy networks. © 2019 IEEE.

2019

Data-driven predictive energy optimization in a wastewater pumping station

Autores
Filipe, J; Bessa, RJ; Reis, M; Alves, R; Povoa, P;

Publicação
APPLIED ENERGY

Abstract
Urban wastewater sector is being pushed to optimize processes in order to reduce energy consumption without compromising its quality standards. Energy costs can represent a significant share of the global operational costs (between 50% and 60%) in an intensive energy consumer. Pumping is the largest consumer of electrical energy in a wastewater treatment plant. Thus, the optimal control of pump units can help the utilities to decrease operational costs. This work describes an innovative predictive control policy for wastewater variable-frequency pumps that minimize electrical energy consumption, considering uncertainty forecasts for wastewater intake rate and information collected by sensors accessible through the Supervisory Control and Data Acquisition system. The proposed control method combines statistical learning (regression and predictive models) and deep reinforcement learning (Proximal Policy Optimization). The following main original contributions are produced: (i) model-free and data-driven predictive control; (ii) control philosophy focused on operating the tank with a variable wastewater set-point level; (iii) use of supervised learning to generate synthetic data for pre-training the reinforcement learning policy, without the need to physically interact with the system. The results for a real case-study during 90 days show a 16.7% decrease in electrical energy consumption while still achieving a 97% reduction in the number of alarms (tank level above 7.2 m) when compared with the current operating scenario (operating with a fixed set-point level). The numerical analysis showed that the proposed data-driven method is able to explore the trade-off between number of alarms and consumption minimization, offering different options to decision-makers.

2019

Information, uncertainty and the manipulability of artificial intelligence autonomous vehicles systems

Autores
Osorio, A; Pinto, A;

Publicação
INTERNATIONAL JOURNAL OF HUMAN-COMPUTER STUDIES

Abstract
In an avoidable harmful situation, autonomous vehicles systems are expected to choose the course of action that causes the less damage to everybody. However, this behavioral protocol implies some predictability. In this context, we show that if the autonomous vehicle decision process is perfectly known then malicious, opportunistic, terrorist, criminal and non-civic individuals may have incentives to manipulate it. Consequently, some levels of uncertainty are necessary for the system to be manipulation proof. Uncertainty removes the mis-behavior incentives because it increases the risk and likelihood of unsuccessful manipulation. However, uncertainty may also decrease the quality of the decision process with negative impact in terms of efficiency and welfare for the society. We also discuss other possible solutions to this problem.

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