Percorrer por autor "Soares, V.N.G.J."
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- An Eco-Energetic performance comparison of dehumidification systems in High-Moisture indoor environmentsPublication . Santos, Alexandre F.; Gaspar, Pedro Dinis; Souza, Heraldo J.L.; Caldeira, J.M.L.P.; Soares, V.N.G.J.This study discusses the choice of dehumidification systems for high-moisture indoor environments, such as indoor swimming pools, supported by an eco-energetic performance comparison. Initially, the causes of the high relative humidity and condensation in these spaces are reported, as well as the available dehumidification technologies. Two different solutions are described: desiccant wheel dehumidification and re-cooling. The energy demand required by a refrigeration system is lower than the desiccant wheel; however, the former system requires less maintenance and does not require refrigerant fluid. An eco-energetic comparison is performed between the two systems in two countries with different energy matrices (Brazil and USA). In Brazil, the desiccant wheel is the best choice for the past 10 years, with a predicted 351,520 kgCO2 of CO2 emissions, which is 38% lower than the refrigeration system. In the USA, the best option is the refrigeration system (1,463,350 kgCO2), a 12% more efficient option than desiccant wheels. This model can be considered for energy and CO2 emissions assessment, predicting which system has better energy efficiency and lower environmental impact, depending on the refrigerant type, location and environmental conditions.
- An opportunistic routing solution to monitor isolated elderly people in rural areasPublication . Jesús-Azabal, Manuel; Berrocal-Olmeda, Javier; García-Alonso, José; Soares, V.N.G.J.; Galán-Jiménez, JaimeCountries are experiencing a global population ageing. It is estimated that the percentage of third age people will notably increase in next decades, implying a difficult challenge to society. Rural areas are the most affected locations by these conditions. Currently, small vil- lages are facing an increasing ageing of population where almost 40% of inhabitants are over 65. Medical needs are one of the most relevant aspects in this context. This factor, in conjunction with other reasons such as loneliness, motivates technological solutions. Despite this, Inter- net is not accessible from rural and low income areas, due to the lack of interest from the operator side to invest in these locations. In this paper, an opportunistic routing solution based on BLE is proposed, with the aim of monitoring loneliness population in order to detect potential emergencies.
- Aplicação para detetar e corrigir a postura em exercícios físicosPublication . Gonçalves, João; Palhares, João; Soares, V.N.G.J.; Neves, Paulo AlexandreNo ritmo acelerado da vida moderna a prática regular de exercício físico emerge como fonte de vitalidade e bem-estar. No entanto nem sempre é possível a deslocação ao ginásio e/ou pagar a um treinador pessoal. A opção por exercícios sem equipamentos usando o peso do corpo é apelativa pelos benefícios e baixo custo, mas podem surgir lesões pela sua má execução, nomeadamente devido a postura incorreta. Este trabalho apresenta uma abordagem para permitir, utilizando técnicas de visão computacional, detectar que exercício o praticante está a executar e analisar a postura, sem necessidade de intervenção de uma terceira pessoa. Os principais contributos deste artigo são: 1) Desenvolvimento de um dataset robusto para deteção de 3 exercícios de ginástica diferentes, 2) Avaliação do desempenho do modelo YOLOv8, bem como alguns dos seus diferentes níveis, usando o dataset desenvolvido; 3) Criação de um protótipo de aplicação para detetar um exercício e corrigir a realização do mesmo por parte dos utilizadores. O principal objetivo é fornecer aos utilizadores uma forma de facilitar a realização de atividade física, em qualquer lugar, sem a necessidade de acompanhamento especial ou equipamentos externos, sendo ao mesmo tempo um adjuvante para garantir que não ocorrem lesões por má postura.
- Autonomous robot path construction prototype using wireless sensor networksPublication . Amaro, José Paulo; Caldeira, J.M.L.P.; Soares, V.N.G.J.; Dias, João A.The use of wireless sensor networks (WSN) can be a valuable contribution in disaster situations or life-threatening exploration. Using wireless mobile robots, it is possible to explore vast areas without human intervention. However, the wireless network coverage that can keep mobile robots connected to the base station / gateway is a major limitation. With this in mind it was created a prototype of an extensible WSN using mobile robot nodes that cooperate amongst themselves. The strategy adopted in this project proposes using three types of nodes: master node, static node, and robot node. Three different algorithms were also developed and proposed: Received Signal Strength Indication (RSSI) Request; Automovement; Robot Cooperation and Response to Static Node. The performance evaluation of the prototype was carried out using a real-world testbed with each developed algorithm. The results achieved were very promising to continue the evolution of the prototype.
- Computational simulation of an agricultural robotic rover for weed control and fallen fruit collection : algorithms for image detection and recognition and systems control, regulation and commandPublication . Ribeiro, João P.L.; Gaspar, Pedro Dinis; Soares, V.N.G.J.; Caldeira, J.M.L.P.The continuous rise in the world’s population has increased the need for food, resulting in a rise of agricultural holdings to ensure the supply of these goods directly to the populations and indirectly to all processing industries in the food business. This situation has led agriculture to reinvent itself and introduce new technics and tools to ensure tighter control of the crops and increase yields in food production. However, the lack of labor coupled with the evolution of weeds resistant to herbicides created a crisis in agricultural food production. However, with the growing evolution in electronics, automation, and robotics, new paths are emerging to solve these problems. A robotic rover was designed to optimize the tasks of weed control and collection of fallen fruits of an orchard. In weed control, a localized spraying system is proposed, therefore reducing the amount of applied herbicides. With fruit collection, it is possible to direct fallen fruits for animal feeding and possible to reduce microbial activity on the next campaign crops, therefore avoiding damage. This study proposes the simulation of this robotic rover on robotic simulation software. It also proposes the replication of a similar environment of an orchard to generate an algorithm that controls the rover on the tasks of localized spraying and fallen fruit collection. Creating and testing these algorithms by using a robotic simulator speed up and ease the evaluation of different scenarios and hypotheses, with the added benefit of being able to test two tasks simultaneously. This method also allows greater freedom and creativity because there are no concerns about hardware damage. It should also be noted that development costs are very low.
- Computer vision for reducing food waste in an institutional canteen: A literature review and performance analysisPublication . Correia, Ana; Aidos, Clara; Caldeira, J.M.L.P.; Soares, V.N.G.J.Food waste in today's society has been the subject of growing interest and discussion, given its economic, environmental, social, and nutritional implications. Although food waste is present throughout the food supply chain, in developed countries it tends to be higher in the final stages of consumption (e.g., households and food services). This study focuses on institutional canteens, where food waste includes prepared meals that have not been sold (i.e., leftovers), as well as food served that is left on plates after the meal has been consumed (i.e., scraps). It presents a first step towards developing a prototype/solution based on computer vision techniques to identify and quantify food waste in an institutional canteen. It begins by introducing the related concepts. It then surveys the state-of-the-art and categorizes existing solutions, presenting their main characteristics, strengths, and limitations. Inception-V3 and ResNet-50 are identified as the most promising computer vision techniques, and their performance has been evaluated. Information is also provided on open questions and research directions in this area
- Conciliar formação académica com formação especializada no ensino de unidades curriculares de Redes Informáticas : um caso de estudoPublication . Soares, V.N.G.J.; Fonte, AlexandreA Cisco Systems é líder mundial em tecnologia para a Internet. A Cisco Networking Academy é um programa de capacitação profissional e desenvolvimento de carreiras no setor de Tecnologias de Informação (TI) para instituições de ensino e pessoas em todo o mundo. Os cursos da Cisco Networking Academy são concebidos com o objetivo da preparação para os exames de Certificação Cisco, e estão alinhados e são reconhecidos pela indústria. Estas certificações são altamente valorizadas pelos empregadores em todo o mundo, e os profissionais que as detêm estão entre os mais bem pagos na área de TI em todo o mundo. Este foi o mote para a criação da Academia Cisco da Escola Superior de Tecnologia do Instituto Politécnico de Castelo Branco (IPCB) em 2003, como um centro técnico de formação especializado em redes, que disponibiliza um vasto catálogo de cursos de formação, sendo as principais as formações CCNA (Cisco Certified Network Associate), CCNA Security e CCNP (Cisco Certified Network Professional Program). Cientes da crescente necessidade de implementação e gestão de tecnologias Cisco no mercado, e com vista a potenciar o reconhecimento das competências dos estudantes das Licenciaturas de Engenharia Informática e de Tecnologias da Informação e Multimédia do IPCB, os docentes das unidades curriculares (UCs) Redes de Comunicação de Dados e Arquitetura Internet, promoveram recentemente a reformulação dos seus conteúdos programáticos, alinhando-os com o catálogo de formação CCNA, bem como das metodologias de ensino e de avaliação para potenciar o processo de ensino aprendizagem. Estas UCs têm agora uma forte componente prática, com aulas ativas combinadas com o extensivo programa de e-learning da Cisco que apoia o autoestudo e autoaprendizagem e permite o uso de simuladores de redes. Este artigo reflete sobre o impacto das alterações introduzidas nas UCs, na motivação e o interesse dos alunos nos conteúdos e atividades desenvolvidas, na avaliação pedagógica e da atividade do docente, e na taxa de sucesso.
- Connection-aware digital twin for mobile adhoc networks in the 5G eraPublication . Jesús-Azabal, Manuel; Zhang, Zheng; Gao, Bingxia; Yang, Jing; Soares, V.N.G.J.5G Mobile Adhoc Networks (5G-MANETs) are a popular and agile solution for data transmission in local contexts while maintaining communication with remote entities via 5G. These characteristics have established 5G-MANETs as versatile communication infrastructures for deploying contextual applications, leveraging physical proximity while exploiting the possibilities of the Internet. As a result, there is growing interest in exploring the potential of these networks and their performance in real-world scenarios. However, the management and monitoring of 5G-MANETs are challenging due to their inherent characteristics, such as highly variable topology, unstable connections, energy consumption of individual devices, message routing, and occasional inability to connect to 5G. Considering these challenges, the proposed work aims to address real-time monitoring of 5G-MANETs using a connection-aware Digital Twin (DT). The approach provides two main functions: offering a live virtual representation of the network, even in scenarios where multiple nodes lack 5G connectivity, and estimating the performance of the infrastructure, enabling the specification of customized conditions. To achieve this, a communication architecture is proposed, analyzing its components and defining the involved processes. The DT is implemented and evaluated in a laboratory setting, assessing its accuracy in representing the physical network under varying conditions of topology and Internet availability. The results show 100% accuracy for the DT in fully connected topologies, with ultra-low latency averaging under 80 ms, and suitable performance in partially connected contexts, with latency averages below 3000 ms.
- Creation of a vehicular delay-tolerant network prototypePublication . Dias, João A.; Isento, João N.; Silva, Bruno M.; Soares, V.N.G.J.; Ferreira, Paulo S.; Nogueira, António M.D.; Rodrigues, JoelVehicular Delay-Tolerant Network (VDTN) is a new disruptive network architecture where vehicles act as the communication infrastructure. VDTN follows a layered architecture based on control and data planes separation, and positioning the bundle layer under the network layer. VDTN furnishes low-cost asynchronous communications coping with intermittent and sparse connectivity, variable delays and even no end-to-end connection. This paper presents a VDTN prototype (testbed) proposal, which implements and validates the VDTN layered architecture considering the proposed out-of-band signaling. The main goals of the prototype are emulation, demonstration, performance evaluation, and diagnose of protocol stacks and services, proving the applicability of VDTNs over a wide range of environments.
- Desenho e implementação de protótipo para deteção de contentores de resíduos em cidades inteligentesPublication . Valente, Miguel; Silva, Hélio; Caldeira, J.M.L.P.; Soares, V.N.G.J.; Gaspar, Pedro DinisEste trabalho apresenta o desenho e implementação de um protótipo funcional para avaliar e validar a utilização de técnicas de visão computacional, na identificação de contentores de resíduos no contexto de uma cidade inteli- gente. Este protótipo recorre à utilização de uma rede neuronal convolucional YOLO e de um microcomputador Jetson Nano da Nvidia. Comparativamente ao método atual de identificação de contentores de resíduos por radiofrequência, esta abordagem é mais ágil e diminui os recursos necessários para implementa- ção, contribuindo para poupar nos gastos logísticos e de implementação da gestão inteligente de resíduos.