NoSQL databases were initially devised to support a few concrete extreme scale applications. Since the specificity and scale of the target systems justified the investment of manually crafting application code their limited query and indexing capabilities were not a major im- pediment. However, with a considerable number of mature alternatives now available there is an increasing willingness to use NoSQL...

Hoje em dia com a massificação e popularidade das redes sem fios (WiFi) o numero de utilizadores a adotarem esta tecnologia é cada vez maior. Quando um utilizador se liga a uma rede WiFi, caso existam registos (logs) sobre a ligação do utilizador à rede, é possível determinar a localização e movimentos do utilizador no espaço, entre outros. Geralmente, quanto maior for o numero de utilizadores na rede...

With the growing popularity of micro-task crowdsourcing platforms, a renewed interest in the resolution of complex tasks that require the coopera-tion of human and machine participants has emerged. This interest has led to workflow approaches that present new challenges at different dimensions of the human-machine computation process, namely in micro-task specification and human-computer interaction due ...

Personality traits play a key role in the shaping of emotions, moods, cognitions, and behaviours of individuals interacting in a virtual environment. The personalities one exhibits reflect one’s perception of the world and are demonstrated in the act of communication. Thus, the evaluation of a message can be changed due to stress and mood variations. Being able to identify the degree of relationship...