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SAR.IoT: Secured Augmented Reality for IoT Devices Management
Publication . Fuentes, Daniel; Correia, Luís; Costa, Nuno; Reis, Arsénio; Barroso, João; Pereira, António
Currently, solutions based on the Internet of Things (IoT) concept are increasingly being adopted in several fields, namely, industry, agriculture, and home automation. The costs associated with this type of equipment is reasonably small, as IoT devices usually do not have output peripherals to display information about their status (e.g., a screen or a printer), although they may have informative LEDs, which is sometimes insufficient. For most IoT devices, the price of a minimalist display, to output and display the device’s running status (i.e., what the device is doing), might cost much more than the actual IoT device. Occasionally, it might become necessary to visualize the IoT device output, making it necessary to find solutions to show the hardware output information in real time, without requiring extra equipment, only what the administrator usually has with them. In order to solve the above, a technological solution that allows for the visualization of IoT device information in actual time, using augmented reality and a simple smartphone, was developed and analyzed. In addition, the system created integrates a security layer, at the level of AR, to secure the shown data from unwanted eyes. The results of the tests carried out allowed us to validate the operation of the solution when accessing the information of the IoT devices, verify the operation of the security layer in AR, analyze the interaction between smartphones, the platform, and the devices, and check which AR markers are most optimized for this use case. This work results in a secure augmented reality solution, which can be used with a simple smartphone, to monitor/manage IoT devices in industrial, laboratory or research environments.
A Obra como Rasto
Publication . Marques, Jorge Miguel Matias; Faria, Nuno Filipe Moreira Ribeiro; Bragança, Célia Melo
O presente documento tem por objetivo refletir acerca de um conceito particular que identifiquei como sendo central à minha prática artística em gravura: o conceito de “rasto”. O termo “rasto” refere-se a um resto material deixado após uma ação. Assim, procuro estabelecer uma aproximação entre a prática da gravura e o conceito de rasto, ao delimitar um conjunto de caraterísticas comuns a ambos os processos, numa reflexão que articula os conceitos de aura e informe. Ao longo deste documento demonstrarei como rasto e gravura se assemelham nas caraterísticas materiais dos processos que englobam, bem como nos seus produtos e a forma particular como estes se significam. Em particular destacarei a forma como os seus processos compreendem a mesma conjuntura onde uma substância que agindo como matriz transfere as suas caraterísticas para uma superfície recetora.
IndoorCare: Low-Cost Elderly Activity Monitoring System through Image Processing
Publication . Fuentes, Daniel; Correia, Luís; Costa, Nuno; Reis, Arsénio; Ribeiro, José; Rabadão, Carlos; Barroso, João; Pereira, António
The Portuguese population is aging at an increasing rate, which introduces new problems, particularly in rural areas, where the population is small and widely spread throughout the territory. These people, mostly elderly, have low income and are often isolated and socially excluded. This work researches and proposes an affordable Ambient Assisted Living (AAL)‐based solution to monitor the activities of elderly individuals, inside their homes, in a pervasive and non-intrusive way, while preserving their privacy. The solution uses a set of low‐cost IoT sensor devices, computer vision algorithms and reasoning rules, to acquire data and recognize the activities performed by a subject inside a home. A conceptual architecture and a functional prototype were developed, the prototype being successfully tested in an environment similar to a real case scenario. The system and the underlying concept can be used as a building block for remote and distributed elderly care services, in which the elderly live autonomously in their homes, but have the attention of a caregiver when needed.
Empresa familiar y bolsa: análisis de rentabilidad y estrategias de inversión
Publication . Marcelo, José Luis Miralles; Quirós, María del Mar Miralles; Lisboa, Inês
El objetivo de este estudio consiste en analizar las diferencias en rentabilidad entre las empresas familiares y no familiares cotizadas en la bolsa española durante el periodo 1999-2008. El estudio se completa con un análisis comparado de la exposición frente al riesgo de estos dos tipos de empresa, los benefi cios obtenidos de una estrategia de inversión de coste cero basada en estar largo en empresas familiares y corto en empresas no familiares, así como la infl uencia en los resultados de los efectos fundador y tamaño. Los principales resultados obtenidos contradicen la evidencia empírica previa y señalan la posibilidad de obtener benefi cios extraordinarios invirtiendo en empresas familiares de reducido tamaño así como la mayor exposición frente al riesgo de las empresas directamente gestionadas por su fundador. Estos resultados son especialmente relevantes para los inversores tanto
individuales como institucionales, para los académicos, así como para los dirigentes de este tipo de empresas.
Effect of process parameters on the morphological and mechanical properties of 3D Bioextruded poly(ε‐caprolactone) scaffolds
Publication . Domingos, M.; Chiellini, F.; Gloria, A.; Ambrosio, L.; Bártolo, P.; Chiellini, E.
Purpose – This paper aims to report a detailed study regarding the influence of process parameters on the morphological/mechanical properties of poly(1-caprolactone) (PCL) scaffolds manufactured by using a novel extrusion-based system that is called BioExtruder.
Design/methodology/approach – In this study the authors focused investigations on four parameters, namely the liquefier temperature (LT), screw rotation velocity (SRV), deposition velocity (DV) and slice thickness (ST). Scaffolds were fabricated by employing three different values of each parameter. Through a series of trials, scaffolds were manufactured varying iteratively one parameter while maintaining constant the other ones. The morphology of the structures was investigated using a scanning electron microscope (SEM), whilst the mechanical performance was assessed though compression tests.
Findings – Experimental results highlight a direct influence of the process parameters on the PCL scaffolds properties. In particular, DV and SRV have the highest influence in terms of road width (RW) and consequently on the porosity and mechanical behaviour of the structures.
Research limitations/implications – The effect of process and design parameters on the biological response of scaffolds is currently under investigation.
Originality/value – The output of this work provides a major insight into the effect of process parameters on the morphological/mechanical properties of PCL scaffolds. Moreover, the potential and feasibility of this novel extrusion-based system open a new opportunity to study how structural features may influence the characteristics and performances of the scaffolds, enabling the development of integrated biomechanical models that can be used in CAD systems to manufacture customized structures for tissue regeneration.