A Novel Communication Platform to Enable the Collaboration of Autonomous Underwater Vehicles

Abstract -A novel communication platform is introduced to enable the collaboration of a set of Autonomous Underwater Vehicles (AUV´

Providing Differentiated Qos For Peer-To-Peer File Sharing Systems

In this paper, we propose a new Cluster Server Architecture (CSA) to realize an enhanced differentiated QoS in P2P file sharing systems. CSA adopts two approaches to provide a better QoS for dedicated users than standard users: (1) expedited forwarding messages of dedicated users and system maintenance messages at each node to speedup their response times, and (2) temporarily caching and instantly supplying routing information for dedicated users to reduce their self-organization overhead and warm-up time. Both theoretical analysis and simulation results show that our proposed architecture and algorithms effectively and efficiently implement a differentiated QoS model in P2P file sharing systems. The CSA introduces only modest overhead but still retains a good scalability and robustness

A lightweight distributed super peer election algorithm for unstructured dynamic P2P systems

Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia Electrotécnica e de ComputadoresNowadays with the current growth of information exchange, and the increasing mobility of devices, it becomes essential to use technology to monitor this development. For that P2P networks are used, the exchange of information between agencies is facilitated, these now being applied in mobile networks, including MANETs, where they have special features such as the fact that they are semi-centralized, where it takes peers more ability to make a greater role in the network. But those peer with more capacity, which are used in the optimization of various parameters of these systems, such as optimization\to research, are difficult to identify due to the fact that the network does not have a fixed topology, be constantly changing, (we like to go online and offline, to change position, etc.) and not to allow the exchange of large messages. To this end, this thesis proposes a distributed election algorithm of us greater capacity among several possible goals, enhance research in the network. This includes distinguishing characteristics, such as election without global knowledge network, minimal exchange of messages, distributed decision made without dependence on us and the possibility of influencing the election outcome as the special needs of the network