Browsing by Author "Oliveira, J."
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- Air and Underwater Survey of water enclosed spaces for VAMOS! ProjectPublication . Almeida, J.; Ferreira, A.; Matias, B.; Dias, A.; Martins, A.; Silva, F; Oliveira, J.; Sousa, P.; Moreira, M.; Miranda, T.; Almeida, C.; Silva, E.This paper addresses a three-dimensional (3D) reconstruction of a flooded open pit mine with an autonomous surface vehicle (ASV) and unmanned aerial vehicle (UAV). The ROAZ USV and the Otus UAV were used to provide the underwater bathymetric map and aerial 3D reconstruction based from image data. This work was performed wihtin the context of the European researcj project VAMOS with the objective of developing robotic tools for efficient underwater mining
- Leather wastes as a potential source of biochemicals and biomaterialsPublication . Dias, R.; Crispim, A.; Silva, P.; Neto, P.; Gaião, J.; Oliveira, J.Framework: Leather industry is one of the oldest and most traditional industries, although it produces high amount of solid waste and wastewater; • Only 20% of the of the hide results in finished leather products • Annually, 41,000 tons of organic solid waste are generated in Portugal; • From an economical and environmental point of view, there is a great interest in the valorisation of the generated solid wastes.
- Postaerobic exercise blood pressure reduction in very old persons with hypertensionPublication . Oliveira, J.; Mesquita-Bastos, J.; Melo, Cristina; Ribeiro, F.A single bout of aerobic exercise acutely decreases blood pressure, even in older adults with hypertension. Nonetheless, blood pressure responses to aerobic exercise in very old adults with hypertension have not yet been documented. Therefore, this study aimed to assess the effect of a single session of aerobic exercise on postexercise blood pressure in very old adults with hypertension. Eighteen older adults with essential hypertension were randomized into exercise (N = 9, age: 83.4 ± 3.2 years old) or control (N = 9, age: 82.7 ± 2.5 years old) groups. The exercise group performed a session of aerobic exercise constituting 2 periods of 10 minutes of walking at an intensity of 40% to 60% of the heart rate reserve. The control group rested for the same period of time. Anthropometric variables and medication status were evaluated at baseline. Heart rate and systolic and diastolic blood pressures were measured at baseline, after exercise, and at 20 and 40 minutes postexercise. Systolic blood pressure showed a significant interaction for group × time (F3,24 = 6.698; P = .002; ηp = 0.153). In the exercise group, the systolic blood pressure at 20 (127.3 ± 20.9 mm Hg) and 40 minutes (123.7 ± 21.0 mm Hg) postexercise was significantly lower in comparison with baseline (135.6 ± 20.6 mm Hg). Diastolic blood pressure did not change. Heart rate was significantly higher after the exercise session. In the control group, no significant differences were observed. A single session of aerobic exercise acutely reduces blood pressure in very old adults with hypertension and may be considered an important nonpharmacological strategy to control hypertension in this age group.
- Quality and safety continuous improvement through lean toolsPublication . Santos, Gilberto; Sá, José Carlos; Oliveira, J.; Ramos, Delfina; Ferreira, C.The purpose of this chapter is to suggest the use of several lean tools that can be used, indicating the improvements that can be obtained with each of the recommended tools. The main objective is to be a contribution to the organizations, showing how they can detect the wastes in the productive flow through VSM, and at the same time to improve the quality of products through lean tools. The method presented was a case study. The various lean tools were also collected and described. This chapter intends to show several lean tools that can be applied in different situations, as well as, the wastes that each can eliminate and the benefits that are obtained from each one. Throughout the production process, with the support of Value Stream Mapping (VSM), it was possible to detect several wastes. A case study is presented as results from a work carried out in a company that is dedicated to the production of mechanical equipment. This work can be a guide to support organizations that wish to start their lean road. Smart value creation remains today dependent on the maturity of how lean management tools are applied. Lean, innovative technologies, critical knowledge, talent and big data need other dimensions to be sustainable. Quality and safety continuous improvement through lean tools, as well as, Industry 4.0 assumes a critical pillar for the new journey toward the future of our organizations.
- The Usage of Data Augmentation Strategies on the Detection of Murmur Waves in a Pcg SignalPublication . Torres, J.; Oliveira, J.; Gomes, Elsa FerreiraCardiac auscultation is a key screening tool used for cardiovascular evaluation. When used properly, it speeds up treatment and thus improving the patient’s life quality. However, the analysis and interpretation of the heart sound signals is subjective and dependent of the physician’s experience and domain knowledge. A computer assistant decision (CAD) system that automatically analyse heart sound signals, can not only support physicians in their clinical decisions but also release human resources to other tasks. In this paper, and to the best of our knowledge, for the first time a SMOTE strategy is used to boost a Convolutional Neural Network performance on the detection of murmur waves. Using the SMOTE strategy, a CNN achieved an overall of 88.43%.
- Wet-white shavings as a potential source for leather retanning bioagentsPublication . Freitas, Teresa; Marujo, I.; Ribeiro, D.; Crispim, Alfredo; Neto, Maria Paula; Gaião, J.; Oliveira, J.The tanning industry generates a high quantity of solid wastes, so there is a need to create ways to value these wastes with aim to reduce environmental impact. A lot of research work has been done recently and some authors have shown the potential for obtaining protein hydrolysates from solid wastes and its application. The present work had a main objective the wet-white shavings valorization by production of hydrolysed protein and biopolymrs for leather retanning.