Encontrados 10 documentos, a visualizar página 1 de 1
Asynchronous design pattern for many-core and cloud operating systems
Santos, Bruno; Barraca, João Paulo; Aguiar, Rui L.One of the key aspects for many-core and cloud operating systems is message passing communication. The networking aspect of this mechanism requires a high degree of concurrency to handle communicating with thousands of cores simultaneously in an efficient and scalable manner. Non-blocking interfaces allows us to efficiently use a core and gives us concurrency without multiple threads, this also minimizes contex...
Establishment of stackable community networks
Barraca, João Paulo SilvaUma das áreas de investigação em Telecomunicações de interesse crescente prende-se com os futuros sistemas de comunicações móveis de 4a geração e além destes. Nos últimos anos tem sido desenvolvido o conceito de redes comunitárias, no qual os utilizadores se agregam de acordo com interesses comuns. Estes conceitos têm sido explorados de uma forma horizontal em diferentes camadas da comunicação, desde as redes c...
Architecture for orchestration of M2M services
Pires, Gustavo; Antunes, Mário; Corujo, Daniel; Gomes, Diogo; Barraca, João Paulo; Aguiar, Rui L.The past few years, miniaturization has allowed usto imbue computers into everyday devices. This in turn hasenabled these devices to communicate with each other, and in doing so, allows us to collect a wealth of information, moreaccurately and with greater availability than ever before. Thisphenomenon is known as the Internet of Things. It allows smart environments to truly behave in an intelligent manner by us...
User centric community clouds
Barraca, João Paulo Silva; Matos, Alfredo; Aguiar, Rui LuísWith the evolution in cloud technologies, users are becoming acquainted with seamless service provision. Nevertheless, clouds are not a user centric technology, and users become completely dependent on service providers. We propose a novel concept for clouds, where users self-organize to create their clouds. We present such an architecture for user-centric clouds, which relies on self-managed clouds based on do...
A framework for user-centric autonomic management
Barraca, João Paulo; Aguiar, Rui L.This paper presents a novel autonomic management framework for user-centric networks. The framework assumes users are directly involved, or have direct interest, on their communication system, and as such, place user-related constrains on the behavior of the system. Groups of interest, formed either implicitly or explicitly, by users are considered inside the community concept, which the framework supports. For...
Cooperative performance bounds of Wireless Local Area Networks
Sadeghi, Rasool; Barraca, João Paulo; Aguiar, Rui LuísIn a Wireless Local Area Network (WLAN), capacity gain and delay reduction play a crucial role in system performance. In this paper, we focus on performance improvements when WLANs exploit the concept of cooperation among nodes. We propose a geometrical model to determine the potential location area of relay nodes. The analytical results are validated by simulation. Performance bounds and average of capacity ga...
Characterization of Unplanned Metropolitan Wireless Networks
Dias, Filipe; Barraca, João Paulo; Gomes, Diogo; Aguiar, Rui L.Mobile Internet penetration has grown steadily over the last few years. Although most of today’s users have access through their 3G Mobile Operators, there are still regions that are under-covered for various reasons. Wireless Mesh Networks (WMN) can play an important role by providing the means to fully cover those underserved regions. Due to their intrinsic nature, WMN require a critical mass of nodes belongi...
Mecanismos de facturação segura em redes auto-organizadas
Barraca, João Paulo SilvaAs redes ad-hoc e as redes auto-organizadas constituem uma área de investigação com grande interesse. Estas redes são uteis em cenários onde seja necessária uma rede de baixo custo, elevada adaptabilidade e reduzido tempo de criação. As redes infra-estruturadas, tendo uma gestão centralizada, estão agora a começar a adoptar os conceitos de redes autoorganizadas nas suas arquitecturas. Ao contrário dos sistemas ...
Experimental evaluation of the usage of ad hoc networks as stubs for multiservi...
Sarrô, Rafael; Barraca, João Paulo; Sargento, Susana; Aguiar, Rui L.; Almeida, MiguelThis paper describes an experimental evaluation of a multiservice ad hoc network, aimed to be interconnected with an infrastructure, operator-managed network. This network supports the efficient delivery of services, unicast and multicast, legacy and multimedia, to users connected in the ad hoc network. It contains the following functionalities: routing and delivery of unicast and multicast services; distribute...
Sistema de apoio a organização e gestão de conferências cientificas (CoW – Conf...
Gomes, Diogo; Barraca, João Paulo; Sénica, NunoEste artigo pretende divulgar o software de organização e gestão de conferências científicas Conference on the Web (CoW). Software este desenvolvido por alunos finalistas de Eng. Computadores e Telemática na cadeira de opção de 5º ano, de Ferramentas e Aplicacionais Multimédia. ; This article intends to divulge software developed to help in the organization and management of Scientific Conferences on the Web (...
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