André Cavalcante

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The recent development of regulatory policies that permit the use of TV bands spectrum on a secondary basis has motivated discussion about coexistence of primary (e.g. TV broadcasts) and secondary users (e.g. WiFi users in TV spectrum). However, much less attention has been given to coexistence of different secondary wireless technologies in the TV white(More)
We describe the design, implementation, and evaluation of Molé, a mobile organic localisation engine. Unlike previous work on crowdsourced WiFi positioning, Molé uses a hierarchical name space. By not relying on a map and by being more strict than uninterpreted names for places, Molé aims for a more flexible and scalable point in the design space of(More)
OBJECTIVE In this study, we aimed to quantify posture and body image in patients with major depressive disorder during episodes and after drug treatment, comparing the results with those obtained for healthy volunteers. METHOD Over a 10-week period, we evaluated 34 individuals with depression and 37 healthy volunteers. Posture was assessed based on(More)
Current mobile devices continuously estimate their locations, allowing users to “check in”, find nearby friends and interests, and determine routes to their destinations. While underlying satellite, cell, and WiFi-based positioning systems can return an accurate and meaningful position in many cases, extending them to work energy-efficiently, particularly(More)
In this paper an analysis of a distributed control system based on Java is presented. A classical PID controlled system is implemented simulating each part of a real control system running in different computers connected to a local area network. The communication message time periods and their jitter are measured running the system in different computer(More)