Wearable device requirements currently vary from soft to hard real-time constraints. Frequently, hardware improvements are a way to speed-up the global performance of a solution. However, changing some parts or the whole hardware may increase device complexity, raising the costs and leading to development delays of products or research prototypes. This paper focuses on software improvements, presenting a tool designed to create different versions of operating systems (OSs) fitting the specifications of wearable devices projects. Authors have developed a software tool allowing the end-user to craft a new OS in just a few steps. In order to validate the generated OS, an original wearable prototype for mining environments is outlined. Resulting data presented here allows for measuring the actual impact an OS has in different variables of a solution. Finally, the analysis also allows for evaluating the performance impact associated with each hardware part. Results suggest the viability of using the proposed solution when searching for performance improvements on wearables.
Este artigo apresenta um estudo de caso sobre a formação de professores do ensino primário, fundamental e médio para o uso de tecnologias no ensino remoto de emergência, durante a pandemia da Covid-19. São analisadas uma palestra e oito aulas virtuais síncronas conduzida por web-conferência. Em todas as aulas virtuais foram aplicados questionários de avaliação para os participantes, com o objetivo de validar ou não as estratégias, conteúdos e ferramentas utilizados na formação remota. A análise dos questionamentos durante as oficinas evidenciou que muitas das preocupações e dúvidas se relacionam à falta de formação em estratégias didáticas inovadoras acompanhadas de recursos tecnológicos.
A very low-cost portable Multichannel Analyzer (MCA) built with off-the-shelf commercial components is presented. Built around an universal microcontroller based platform for portable instruments, previously developed in our group, this intelligent portable MCA is operated by multicell Li-ion batteries and has power, and memory autonomy, for several hours of spectra collecting. The MCA integrates a basic frontend pulse shape amplifier, a base line restorer, a peak detector and logic control circuitry. The growing of the radiation spectrum can be easily observed on site through a dot-matrix graphic display. To save the acquired data and allow for the configuration of setup parameters, it connects to any host computer through standard USB, IrDA or RS-232 serial interfaces being also prepared to interface a GPS unit. Software application programs in both the portable MCA and the host PC are presented.
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