Bandeira Duarte's research while affiliated with Federal University of Rio de Janeiro and other places
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Publications (13)
This paper defines a continuity and intermedia synchronization service, and specifies its protocol using a high performance architecture. This service aims multimedia applications that involve stored or live data sources, implicit temporal relationships, multiple sources and destinations, and do not utilize global clock. The service is defined by i...
Using a single parameter for the specification of the level of quality of service in multicast multi-layered applications is not adequate because of the different application requirements and the heterogeneous nature of the receivers. In this paper, we propose a three-metric approach that takes into account the type of the applications, which impro...
Resumo Este trabalho descreve a implementação de um serviço de continuidade e sincronização intermídia e do seu respectivo protocolo utilizando uma arquitetura de alto desempenho. Este serviço visa aplicações multimídias que envolvam fontes de dados armazenados ou ao vivo, relações temporais implícitas, múltiplas fontes e destinos e não utilizem re...
C. P. 68504 -CEP 21945-970 -Rio de Janeiro -RJ -Brasil * Tel. +55 21 2260-5010 r.240 Fax +55 21 2562-8628 1 Princípios Básicos do IP Multicast Muitas das novas aplicações da Internet, como vídeo-conferência, ensino à distância e TV na Internet, pertencem à categoria de comunicação de grupo, ao contrário de outras aplicações que constituem conversaç...
Cryptography is used to provide security and privacy in data communication. This work presents a description, the functioning and trends of quantum cryptography. We discuss the impossibility of a third party eavesdrops the quantum communication without being noted. The main protocols and its correlation with the currently available technology are p...
This paper describes a platform for distributed virtual environments on the Internet, presenting the principles that have guided the platform design, together with an architecture and a protocol for this platform. The platform employs the division of the participants of the virtual environment into multicast groups in order to achieve scalability....
This paper proposes a new mechanism to authenticate and monitor nodes in ad hoc networks (AMORA) that carries out access control without the need for a central administration entity. AMORA uses delegation chains to spe- cify in a distributive way which users can access the network and it proposes the use of delegate nodes to issue certificates and...
Resumo: Devido a forte tendência observada nos últimos anos por aplicações onde a mobilidade é um requesito fundamental, assistimos uma rápida expansão das redes sem fio, em especial as redes ad hoc, que devido a suas características particulares, apresentam diversas possibilidades de intrusão. Este artigo apresenta de maneira tutorial, as motivaçõ...
Resumo Este artigo propõe implementações para os principais mecanismos de policiamento de tráfego para redes de alta velocidade. As implementações são baseadas em um ambiente de desenvolvimento que privilegia o desempenho e são descritas através de diagramas de blocos comentados. Foram considerados os mecanismos Balde Furado com suas variações, Jan...
The network virtualization is an essential technique to provide physical
resources sharing and to allow implementation of innovations in the core
of networks. Nevertheless, isolation between virtual networks and Quality of
Service (QoS) provisioning are still technological challenges. In this paper, we
propose the QFlow system to isolate resource u...
We propose, implement, and evaluate VIPER, a system to isolate, provide QoS, and manage virtual networks. Contrary to previous approaches, VIPER guarantees a fine shar-ing of physical resources among virtual networks according to the different parameters that describe the service level agreements. The main components of the proposed system are the...
Citations
... The IP multicast service implements this in the network layer, and is composed by a service model, group management and finally by routing protocols. Hence, data should be sent to users of the multicast group, while the network should limit the traffic where there is no demand, aiming at avoiding excessive resource consumption [5,11]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/273825287897101-1442296444845_Q64/Luis-Costa-34.jpg)
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272837290229775-1442060887573_Q64/Otto-Carlos-M-B-Duarte.jpg)
... It is based on Temporal Petri Nets [9,13] and implements inter and intra-media ways of synchronization. A more detailed description of this implementation architecture can be found in [7,8,11,12]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/273632391856149-1442250454686_Q64/Celio-Albuquerque.jpg)
... Software-defined networking allows to apply forwarding rules and policies, such as resource reservation, on the network core directly from a centralized network controller. Mattos and Duarte propose QFlow [12], a mechanism capable of providing resource isolation and quality of service in virtual networks, in the SDN environment, with efficient control of available resources. QFlow also allows the mapping of Quality of Service parameters, defined for each virtual network, into data-plane resources. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/1177006112813059-1657631533633_Q64/Diogo-Menezes-4.jpg)
... Neste trabalho é proposta uma extensão ao mecanismo de sincronização de pares de mídias (mestra, escrava) implementado no Grupo de Teleinformática e Automação da UFRJ [Rubi96,RuDu97], de modo a diminuir o overhead devido ao envio de uma unidade de realimentação para cada unidade de mídia exibida na escrava. Dada a assincronia máxima permissível entre a mestra e uma escrava de um feixe de sincronização (conjunto de fluxos que possuem relações temporais entre si), um servidor de sincronização determina a menor taxa de transmissão pela escrava de unidades de realimentação, mantendo a sincronização entre os pares de mídias. ...
