Browsing by Author "Almeida, Carlos"
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- Custeio baseado em atividades: concepção e implementação numa empresa de serviçosPublication . Almeida, Carlos; Silva, PaulinoEste estudo pretende mostrar o contributo de um projeto para a melhoria da competitividade numa empresa portuguesa de serviços. Através da concepção e implementação do método de custeio baseado em atividades (activity-based costing), consegue-se mostrar o potencial aumento da produtividade e eficiência de uma empresa consultora prestadora de serviços, principalmente na área da formação. Foi possível verificar que os resultados na área da formação possui contribuições diferentes, sendo que o custo por hora na formação para empresas é mais baixo do que o custo por hora na formação para particulares. O custeio baseado em atividades é um sistema utilizado para identificar os custos da empresa com o propósito de aumentar a produtividade e a eficiência no processo produtivo e assim apoiar de forma mais sólida a tomada de decisão. A metodologia utilizada tem como base o estudo de caso na empresa de prestação de serviços, onde foram realizadas várias entrevistas e analisados vários documentos internos.
- Environmental modeling with precision navigation using ROAZ autonomous surface vehiclePublication . Ferreira, Hugo Miguel; Almeida, Carlos; Martins, Alfredo; Almeida, José Miguel; Dias, André; Silva, Guilherme; Silva, EduardoThe use of robotic vehicles for environmental modeling is discussed. This paper presents diverse results in autonomous marine missions with the ROAZ autonomous surface vehicle. The vehicle can perform autonomous missions while gathering marine data with high inertial and positioning precision. The underwater world is an, economical and environmental, asset that need new tools to study and preserve it. ROAZ is used in marine environment missions since it can sense and monitor the surface and underwater scenarios. Is equipped with a diverse set of sensors, cameras and underwater sonars that generate 3D environmental models. It is used for study the marine life and possible underwater wrecks that can pollute or be a danger to marine navigation. The 3D model and integration of multibeam and sidescan sonars represent a challenge in nowadays. Adding that it is important that robots can explore an area and make decisions based on their surroundings and goals. Regard that, autonomous robotic systems can relieve human beings of repetitive and dangerous tasks.
- Forest fire detection with a small fixed wing autonomous aerial vehiclePublication . Martins, Alfredo; Almeida, José; Almeida, Carlos; Figueiredo, André; Santos, Filipe; Bento, Domingos; Silva, Hugo; Silva, EduardoIn this work a forest fire detection solution using small autonomous aerial vehicles is proposed. The FALCOS unmanned aerial vehicle developed for remote-monitoring purposes is described. This is a small size UAV with onboard vision processing and autonomous flight capabilities. A set of custom developed navigation sensors was developed for the vehicle. Fire detection is performed through the use of low cost digital cameras and near-infrared sensors. Test results for navigation and ignition detection in real scenario are presented.
- Impacto das caraterísticas clínicas e sociodemográficas na distribuição de pressões, em sedestação, em indivíduos com lesão medularPublication . Buisson, Sara; Almeida, Carlos; Machado, Nuno; Fernandes, ÂngelaMundialmente, cerca de 75% dos utilizadores de cadeira de rodas (CR) são indivíduos com lesão medular (LM). A perda da capacidade de sentir dor ou pressão excessiva faz com que a realização de ajustes para alívio da pressão sejam escassos (Groah et al., 2015; Nadzri et al., 2021). No entanto, segundo a investigação atual, os fatores sociodemográficos e clínicos têm maior influência no aparecimento das úlceras de pressão, em comparação com os fatores comportamentais, como alívio de pressão e reposicionamentos (Tsuji et al., 2022).
- Impacto do tipo de encosto na distribuição de pressões após push-up em pessoas com lesão medularPublication . Rodrigues, Sara; Almeida, Carlos; Machado, Nuno; Fernandes, ÂngelaA lesão medular (LM) apresenta uma elevada prevalência. Na Europa há cerca de 330 mil indivíduos com lesão medular (LM) e Portugal apresenta a maior taxa de incidência de LM traumáticas (Barbiellini Amidei et al., 2022). Além disso, sabe-se que 75% dos usuários de cadeira de rodas (CR) são indivíduos com LM. A prescrição da cadeira mais adequada, leva a melhorias na participação e diminuição de problemas secundários como as úlceras de pressão, no entanto os estudos nesta área focam maioritariamente o assento/almofada e não o encosto (Fadil et al., 2022; Pedersen et al., 2022).
- Manoeuvre Based Mission Control System for an Autonomous Surface VehiclePublication . Dias, Nuno; Almeida, Carlos; Ferreira, Hugo; Almeida, José; Martins, Alfredo; Dias, André; Silva, EduardoIn this work the mission control and supervision system developed for the ROAZ Autonomous Surface Vehicle is presented. Complexity in mission requirements coupled with flexibility lead to the design of a modular hierarchical mission control system based on hybrid systems control. Monitoring and supervision control for a vehicle such as ROAZ mission is not an easy task using tools with low complexity and yet powerful enough. A set of tools were developed to perform both on board mission control and remote planning and supervision. “ROAZ- Mission Control” was developed to be used in support to bathymetric and security missions performed in river and at seas.
- Radar Based Collision detection developments on USV ROAZ IIPublication . Almeida, Carlos; Franco, Tiago; Ferreira, Hugo; Martins, Alfredo; Santos, Ricardo; Almeida, José Miguel; Carvalho, João; Silva, EduardoThis work presents the integration of obstacle detection and analysis capabilities in a coherent and advanced C&C framework allowing mixed-mode control in unmanned surface systems. The collision avoidance work has been successfully integrated in an operational autonomous surface vehicle and demonstrated in real operational conditions. We present the collision avoidance system, the ROAZ autonomous surface vehicle and the results obtained at sea tests. Limitations of current COTS radar systems are also discussed and further research directions are proposed towards the development and integration of advanced collision avoidance systems taking in account the different requirements in unmanned surface vehicles.
- Recommendation of Workplaces in a Coworking Building: A Cyber-Physical Approach Supported by a Context-Aware Multi-Agent SystemPublication . Gomes, Luis; Almeida, Carlos; Vale, ZitaRecommender systems are able to suggest the most suitable items to a given user, taking into account the user’s and item`s data. Currently, these systems are offered almost everywhere in the online world, such as in e-commerce websites, newsletters, or video platforms. To improve recommendations, the user’s context should be considered to provide more accurate algorithms able to achieve higher payoffs. In this paper, we propose a pre-filtering recommendation system that considers the context of a coworking building and suggests the best workplaces to a user. A cyber-physical context-aware multi-agent system is used to monitor the building and feed the pre-filtering process using fuzzy logic. Recommendations are made by a multi-armed bandit algorithm, using ϵ -greedy and upper confidence bound methods. The paper presents the main results of simulations for one, two, three, and five years to illustrate the use of the proposed system
- ROAZ and ROAZ II Autonomous Surface Vehicle Design and ImplementationPublication . Martins, Alfredo; Ferreira, Hugo; Almeida, Carlos; Silva, Hugo; Almeida, José Miguel; Silva, EduardoThe design and implementation of the ROAZ and ROAZ II autonomous surface vehicles (ASV) is presented. These systems were developed at Autonomous Systems Lab, ISEP/IPP – Instituto Superior de Engenharia do Porto under a research program in marine robotics. With multiple applications either in river and estuarine environments or in the sea, the system applications in search and rescue operations are addressed and were taken in consideration for the overall system design. Mechanical design issues are discussed. Hardware, software and implementation status are described along with the control and navigation system architecture. The real time vision processing system is described and results are presented in operational scenario.
- Should non-pharmacological and non-surgical interventions be used to manage neuropathic pain in adults with spinal cord injury? – A systematic reviewPublication . Almeida, Carlos; Monteiro-Soares, Matilde; Fernandes, ÂngelaSpinal Cord Injury (SCI) results in a permanent or temporary alteration of the motor, sensory and/or autonomic functions, frequently leading to neuropathic pain. To deal with this comorbidity, several non-pharmacological and non-surgical (NP-NS) interventions have been developed. However, their efficacy is still uncertain. The aim of this study was to systematically synthetize the available evidence assessing the efficacy of NP-NS interventions for treating neuropathic pain in people with SCI. Thus, an electronic search was conducted in five databases (Pubmed, Scopus, Cochrane Central, Web of Science and EBSCO) and trials registry databases, in addition to a manual search strategy to retrieve additional records. The review included randomized controlled trials with adults with SCI, in any stage of the condition. Data on the efficacy of the interventions was narratively synthetized. Once the research was completed, of 4853 identified references, 24 were included with a total of 653 participants with SCI and neuropathic pain, mostly male and with paraplegia. These studies investigated the effect of 13 types of NP-NS interventions with different protocols and methodological limitations. Seven different assessment scales were analyzed, with neuropathic pain being the primary outcome in 21 studies. Such high heterogeneity impaired the conduction of meta-analysis for any of the interventions. Although promising results were found regarding analgesic effect of NP-NS on neuropathic pain in people with SCI, it is not yet possible to safely state that these interventions are in fact effective. Further studies with homogeneous protocols and methodological quality are still needed.