ESTG - Capítulos de livros
URI permanente para esta coleção:
Navegar
Percorrer ESTG - Capítulos de livros por Objetivos de Desenvolvimento Sustentável (ODS) "10:Reduzir as Desigualdades"
A mostrar 1 - 10 de 17
Resultados por página
Opções de ordenação
- Adaptive Evolutionary Testing: An Adaptive Approach to Search-Based Test Case Generation for Object-Oriented SoftwarePublication . Ribeiro, José Carlos Bregieiro; Zenha-Rela, Mário Alberto; de Vega, Francisco FernándezAdaptive Evolutionary Algorithms are distinguished by their dynamic manipulation of selected parameters during the course of evolving a problem solution; they have an advantage over their static counterparts in that they are more reactive to the unanticipated particulars of the problem. This paper proposes an adaptive strategy for enhancing Genetic Programming-based approaches to automatic test case generation. The main contribution of this study is that of proposing an Adaptive Evolutionary Testing methodology for promoting the introduction of relevant instructions into the generated test cases by means of mutation; the instructions from which the algorithm can choose are ranked, with their rankings being updated every generation in accordance to the feedback obtained from the individuals evaluated in the preceding generation. The experimental studies developed show that the adaptive strategy proposed improves the test case generation algorithm's efficiency considerably, while introducing a negligible computational overhead.
- Application of Renewable Energy—The Case of San Tomé IslandPublication . Ceita, Ludcelma de; Manso, Ricardo; Eugénio, TeresaIn the current context, the energy sector is one of the most important strategic points for the economic transformation of any society. Access to energy is a universal human right and a concern of the state. Whatever national development strategy is defined or implemented, it will always require measures to promote access to energy for all. Although the strong growth of renewable energies worldwide is evident, there are still few studies on their applicability in developing countries. The aim of this study is to contribute to energy sustainability in an emerging country where renewable energies have been little analysed and developed. The country analysed is São Tomé and Príncipe (STP). This paper develops a study on the application of renewable energy, energy sustainability, and clean electricity generation as challenges of the present and ways forward. Aware of the potential of natural resources on the islands of São Tomé and Príncipe, the study follows the following methodology: first phase: a preliminary study to describe the current energy situation on the island; second phase: presentation of a simulation on the use of available resources that has a direct impact on minimising the consumption of fossil fuels on the islands and on the country’s dependence on foreign fuel imports. As a result, the following proposal is made: Utilisation of photovoltaic solar energy with the help of agro-voltaic systems and floating panels, a biomass plant and a transition to electromobility with the help of electric vehicles as energy storage and means of transport.
- Bibliometric Analysis of Sustainable Indicators in AgribusinessPublication . Monteiro, Sónia; Quesado, Patrícia; Ribeiro, Verónica; Fernandes, Maria Eduarda; Eugénio, Teresa; Costa, João; Rodrigues, Hugo; Tomás, MarinaThe aim of this paper is to analyze the scientific production in the last decade (2011–2022) related to sustainable indicators (environmental, economic, social and ESG—Environmental, Social and Governance) in agribusiness. As methodology, a bibliometric study was carried out on articles from Scopus database. Afterwards, the most cited articles, journals and countries were analyzed, as well as a thematic analysis of the keywords. Results indicate that research on sustainable indi- cators of agribusiness has increased over time. In last years, the number of scientific papers on these topics has been increasing, probably associated with the approval of the United Nations for Sustainable Development (known as 2030 Agenda, approved in 2015). Italy is the country with most publications, the highest number of citations, and with the largest collaboration network. Most papers are published in 2 journals of higher impact and LCA (Life Cycle Assessment) is cited as the most usual method to assess the impact of business. Regarding the indicators to evaluate the sustain- ability of agribusiness, there is a greater predominance of environmental indicators compared to economic and social indicators.
- Building and Using an Ontology of Preference-Based Multiobjective Evolutionary AlgorithmsPublication . Li, Longmei; Yevseyeva, Iryna; Basto-Fernandes, Vitor; Trautmann, Heike; Jing, Ning; Emmerich, MichaelIntegrating user preferences in Evolutionary Multiobjective Optimization (EMO) is currently a prevalent research topic. There is a large variety of preference handling methods (originated from Multicriteria decision making, MCDM) and EMO methods, which have been combined in various ways. This paper proposes a Web Ontology Language (OWL) ontology to model and systematize the knowledge of preferencebased multiobjective evolutionary algorithms (PMOEAs). Detailed procedure is given on how to build and use the ontology with the help of Prot´eg´e. Different use-cases, including training new learners, querying and reasoning are exemplified and show remarkable benefit for both EMO and MCDM communities.
- Building Strategic Capabilities in Brazilian FirmsPublication . Fleury, Maria Tereza Leme; Calixto, Cyntia Vilasboas; Frias Pinto, Cláudia Sofia; Fleury, AfonsoIn this chapter, we highlight the strategic capabilities that have enabled six Brazilian companies to achieve competitive advantage. We selected firms from different industries and stages of internationalization in order to show a broad perspective of local and international successful firms. WEG and Fanen developed technological capabilities associated to both world-class manufacturing and product innovation, whereas Stefanini and Integration have consolidated knowledge about servicing emerging markets. Grendene’s production and operations are its key capabilities for international operations through exports, while innovative design and processes support their strategy in the local markets. The key capabilities of Dr.Consulta are entrepreneurship and innovation. In sum, due to highly turbulent institutional and economic environment, Brazilian firms have had to develop some specific capabilities, especially those related to financial management and organizational flexibility.
- Characterising Enterprise Application Integration Solutions as Discrete-Event SystemsPublication . Sawicki, Sandro; Frantz, Rafael Z.; Basto-Fernandes, Vitor; Fabricia Roos-Frantz, Fabricia; Yevseyeva, Iryna; Corchuelo, RafaelIt is not difficult to find an enterprise which has a software ecosystem composed of applications that were built using different technologies, data models, operating systems, and most often were not designed to exchange data and share functionalities. Enterprise Application Integration provides methodologies and tools to design and implement integration solutions. The state-of-the-art integration technologies provide a domain-specific language that enables the design of conceptual models for integration solutions. The analysis of integration solutions to predict their behaviour and find possible performance bottlenecks is an important activity that contributes to increase the quality of the delivered solutions, however, software engineers follow a costly, risky, and time-consuming approach. Integration solutions shall be understood as a discrete-event system. This chapter introduces a new approach based on simulation to take advantage of well-established techniques and tools for discrete-event simulation, cutting down cost, risk, and time to deliver better integration solutions.
- Circular Economy and Sustainability: What Are They Saying About It? – A Literature ReviewPublication . Costa, Berta; Rodrigues, SusanaCircular economy (CE) and sustainability are two interrelated con- cepts that are increasingly gaining attention in the fields of business, economics, and environmental studies. Although both concepts share similarities as they both aim to reduce the negative impact of human activities on the environment and promote sustainable development, they have predominantly been addressed sep- arately as two independent areas of knowledge, and continue to be ambiguous. Their relationship in literature has not been clarified, which may be obfuscating their overall usage. The aim of this article is to clarify the concepts of circular economy and sustainability, to examine how these two constructs have evolved in the last decades, and to identify their similarities and differences. In this regard a specific literature review was performed. For this purpose, 48 publications were identified, and a content analysis was conducted. Based on the aforementioned literature review, key findings relatively to circular economy and sustainability are presented.
- Computational Resource Management for Video Coding in Mobile EnvironmentsPublication . Correa, Guilherme; Assunção, Pedro; Agostini, Luciano; Cruz, Luis A. da SilvaThe increase of computational resources in mobile devices and the availability of reliable communication infrastructures provide support for acquisition, display, coding/decoding and transmission of high-resolution video in a broad set of equipment such as tablets and smartphones. Nevertheless, real-time video encoding and decoding is still a challenge in such computing environments, especially when considering the amount of computational resources required by state-of-the-art video coding standards. Moreover, battery technologies did not evolve as much as desired, which makes power consumption minimization an important issue for the mobile devices industry and users. Therefore, in current mobile systems, the available computational resources along with battery-life are responsible for imposing significant limitations on mobile real-time multimedia communications. This chapter presents an overview of the state-of-the-art research on management of computational resources for video encoding systems in mobile communications equipment. A review on computational complexity analysis of both H.264/AVC and HEVC video coding standards is presented, followed by a description of current methods for modelling, reducing and controlling the expenditure of computational resources on these video codecs. Finally, future trends on computational complexity management for video codecs implemented on power-constrained devices are lined out.
- Design of Radio-Frequency Integrated CMOS Discrete Tuning Varactors Using the Particle Swarm Optimization AlgorithmPublication . Pires, E. J. Solteiro; Mendes, Luís; Oliveira, P. B. de Moura; Machado, J. A. Tenreiro; Vaz, João C.; Rosário, Maria J.This paper presents an automated design procedure of radio- frequency integrated CMOS discrete tuning varactors (RFDTVs). This new method use the maximin and the particle swarm optimization (PSO) algorithms to promote well distributed non-dominated fronts in the parameters space when a single-objective function is optimized. The fitness function used in the search tool is proportional to the RFDTV quality factor. The outcome of the automated design method comprises a set of RFDTV circuits, all having the same maximum performance. Each solution, which corresponds to one RFDTV circuit, is defined by the number of cells and by the circuit components values. This approach allows the designer to choose among several possible circuits the one that is easier to implement in a given CMOS process. To validate the effectiveness of the synthesis procedure proposed in this paper (PSO-method) comparisons with a design method based on genetic algorithms (GA-method) are presented. A 0.18 μm CMOS radio-frequency binary-weighted differential switched capacitor array (RFDSCA) was designed and implemented (the RFDSCA is one of the possible topologies of the RFDTVs). The results show that both design methods are in very good agreement. However, the PSO technique outperforms the GA-method in the design procedure run time taken to accomplish the same performance results.
- Design Optimization of Radio Frequency Discrete Tuning VaractorsPublication . Moreira Mendes, Luís Miguel; Pires, Eduardo J. Solteiro; Oliveira, Paulo B. de Moura; Machado, José A. Tenreiro; Ferreira, Nuno M. Fonseca; Vaz, João Caldinhas; Rosário, Maria J.This work presents a procedure to automate the design of Si-integrated radio frequency (RF) discrete tuning varactors (RFDTVs). The synthesis method, which is based on evolutionary algorithms, searches for optimum performance RF switched capacitor array circuits that fulfill the design restrictions. The design algorithm uses the ε-dominance concept and the maximin sorting scheme to provide a set of different solutions (circuits) well distributed along an optimal front in the parameter space (circuit size and component values). Since all the solutions present the same performance, the designer can select the circuit that is best suited to be implemented in a particular integration technology. To assess the performance of the synthesis procedure, several RFDTV circuits, provided by the algorithm, were designed and simulated using a 0.18μm CMOS technology and the Cadence Virtuoso Design Platform. The comparisons between the algorithm and circuit simulation results show that they are very close,poi ting out that the proposed design procedure is a powerful design tool.