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The new advances in sensor technology, personal digital assistants (PDAs), and wireless communications favor the development of a new type of monitoring system that can provide patients with assistance anywhere and at any time. Of particular interest are the monitoring systems designed for people that suffer from heart arrhythmias, due to the increasing(More)
Patients suspected of suffering sleep apnea and hypopnea syndrome (SAHS) have to undergo sleep studies such as expensive polysomnographies to be diagnosed. Healthcare professionals are constantly looking for ways to improve the ease of diagnosis and comfort for this kind of patients as well as reducing both the number of sleep studies they need to undergo(More)
Due to the emerging interest in integrating dierent application environments , there have been many recent proposals for federated systems. In this paper, a federated system that permits the integration of heterogeneous re-lational databases using a terminological knowledge representation system is presented. In particular, two of the system's components:(More)
Federated database systems allow users to query diierent autonomous databases with a single request. The answer to those requests must be found on the underlying databases. This answering process can be improved if some data are cached within the federated database system. The article presents an approach that allows the deenition of an optimal cache for a(More)
Nowadays, the interest in mobile computing is growing and many issues related to it are aim of research. In this paper, we propose a system that provides mobile computers with new data services, such as renting data lockers, Internet a la carte, etc. The basic idea b ehind the system is to combine the use of the indirect model and the mobile agent(More)
In this article we present the main features of Aingeru, a system that provides a new kind of tele assistance service. The purpose of developing Aingeru has been to overcome the main constraints that tele assistance services nowadays present: they are passive (they react only when the user requires it); their coverage is limited; and, they do not monitor(More)
The cardiovascular diseases and, in particular, diseases related to arrhythmias are a problem that affects a big percentage of the population, being one of the major cause of death in Europe. The new advances in the fields of PDAs, intelligent mobile phones, wireless communications and vital parameter sensors have permitted the development of revolutionary(More)