The production learning of vocalizations by manipulation of the sound production organs to alter the physical structure of sound has been demonstrated in only a few mammals. In this natural experiment, we document the vocal behaviour of two juvenile killer whales, Orcinus orca, separated from their natal pods, which are the only cases of dispersal seen during the three decades of observation of...

Global vision consensus on the next generation of wireless mobile communications, broadly termed 4G, sketches a hybrid infrastructure, comprising different wireless access systems in a complementary manner and vested with reconfiguration capabilities that facilitate a flexible and dynamic adaptation of the wireless infrastructure to meet the ever-changing service requirements. We identify essen...

Today we experience the proliferation of social networking applications. However mobile devices are only scarcely involved as individual members in such networks. In this paper we investigate how mobile phones can participate in social networks. The phonebook of the mobile devices represents basically a small social network which belongs to the owner of the device. The paper introduces mobile-c...

This paper discusses the conditions for the integration of a software companion into a distance training system. The study context is that of Croisières, a device to learn French. The main questions raised when integrating a software companion into such a device can be answered by defining the various roles that the companion plays for the learner, by defining a written dialogue that can be est...

A critical challenge to creating effective agent-based systems is allowing them to operate effectively when the operating environment is complex, dynamic, and error-prone. In this paper we will review the limitations of current “agent-local” approaches to exception handling in agent systems, and propose an alternative approach based on a shared exception handling service that is “plugged”, with...

BACKGROUND Fibrinolytic therapy is the main reperfusion therapy for most STEMI patients in several countries. Current practice guidelines recommended routine early pharmacoinvasive (within 3-24 h after successful fibrinolysis, however it cannot be performed in timely fashion due to limitation of PCI-capable hospitals. This study aimed to evaluate the prognostic utility of the GRACE score in pat...

H"{o}lder in 1893 characterized all groups of order $pqr$ where  $p>q>r$ are prime numbers. In this paper,  by using new presentations of these groups, we compute their full automorphism group.