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In traditionals network simulators, all packets that pass through the network receive individual treatment of the events that occur on them. When high rates of transmission are simulated, this scheme causes large computatio- nal cost... more
In traditionals network simulators, all packets that pass through the network receive individual treatment of the events that occur on them. When high rates of transmission are simulated, this scheme causes large computatio- nal cost resulting in a delayed process to obtain the desired results. A simulator that works on fluid abstraction level treats all flows of the network on a con- tinuous basis and through resolution of differential equations modeled on the behavior of the network. We performed several tests of accuracy and perfor- mance on fluid simulators and packets simulators. The results pointed out that this new method may be able to achieve rapid and accurate enabling a new technique for evaluating performance of high-speed networks.
This paper proposes a framework that oers QoS in a DS domain using Policy-based Management and fuzzy logic techniques. The QoS controller recongures all DS nodes according to ingress trac and domain policies. Policy Based Management is... more
This paper proposes a framework that oers QoS in a DS domain using Policy-based Management and fuzzy logic techniques. The QoS controller recongures all DS nodes according to ingress trac and domain policies. Policy Based Management is used in this framework to provide QoS in DS domain, controlling heterogeneous equipments of dierent manufacturers. The performance and functionalities of a prototype are shown by simulation of a voice over IP application
Di erentiated Services (Di Serv) [1] is a proposal that aims at providing Quality of Service (QoS) for a certain number of service classes in the Internet. This is achieved through service discrimination among ow aggregations pertaining... more
Di erentiated Services (Di Serv) [1] is a proposal that aims at providing Quality of Service (QoS) for a certain number of service classes in the Internet. This is achieved through service discrimination among ow aggregations pertaining to these classes. The Di Serv (DS) architecture is scalable, o ering guarantees for di erent classes, however the QoS can su er
Abstract— This paper describes IntelliDyLBA, a novel traffic engineering scheme based on a load balance reactive method for congestion control in MPLS networks that makes use of genetic algorithm based learning and fuzzy logic techniques.... more
Abstract— This paper describes IntelliDyLBA, a novel traffic engineering scheme based on a load balance reactive method for congestion control in MPLS networks that makes use of genetic algorithm based learning and fuzzy logic techniques. It is an improvement of the ...
Laboratório de Redes de Comunicação e Segurança (LARCES) Universidade Estadual do Ceará (UECE) Av. Paranjana, 1700 – 60740-000 – Fortaleza, CE – Brasil {analuiza,celestino,laure,marcial ,andre,daniel,felipecolares,fernanda, wagner,... more
Laboratório de Redes de Comunicação e Segurança (LARCES) Universidade Estadual do Ceará (UECE) Av. Paranjana, 1700 – 60740-000 – Fortaleza, CE – Brasil {analuiza,celestino,laure,marcial ,andre,daniel,felipecolares,fernanda, wagner, marcel,rafael}@larces.uece.br
Research Interests:
ABSTRACT A computer network management system presents one manager and several agents. The management of large networks demands much computer resources and management system capacity, impossible to achieve with just one manager. The TMN... more
ABSTRACT A computer network management system presents one manager and several agents. The management of large networks demands much computer resources and management system capacity, impossible to achieve with just one manager. The TMN standard, that intends to standardize management systems for telecommunication networks offering those resources, already foresees the use of several managers organized in a hierarchical architecture. This work presents a study of the problems in managing a large network and proposes a protocol for a Hierarchical Management System (HMS). Although we use a example of telecommunication network, the HMS system is suitable for Internet. The HMS protocol is specified using the formal description language Estelle and its functionality is verified using a test model.
ABSTRACT Mesh networks are designed with the goal of providing Internet access service in locations with poor cable infrastructure and service offering free wireless networks. However, these networks have not been standardized and many... more
ABSTRACT Mesh networks are designed with the goal of providing Internet access service in locations with poor cable infrastructure and service offering free wireless networks. However, these networks have not been standardized and many problems are open or inefficient solution, as routing performance. This article proposes a mechanism, MAC-OLSR, to improve packet routing in a mesh network, using the decision support system, MACBETH, together with the pruning system, which improves the selection criterion of routing protocol OLSR (Optimized Link State Routing). To validate this proposal we developed a prototype in the Network Simulator (NS) tested on a scenario based on a real network..
Abstract—The use of Wireless Mesh Networks has growing use in areas without telecommunication infrastructure. One of the main problems is the network performance due to the low capacity of the processors used in intermediary mesh nodes.... more
Abstract—The use of Wireless Mesh Networks has growing use in areas without telecommunication infrastructure. One of the main problems is the network performance due to the low capacity of the processors used in intermediary mesh nodes. We propose a hardware ...
A arquitetura de Serviços Diferenciados (Diffserv) tem por finalidade oferecer garantia de qualidade de serviço (QoS) na Internet. A maioria dos estudos sobre Diffserv (DS), no entanto, tem-se concentrado em garantir qualidade de serviço... more
A arquitetura de Serviços Diferenciados (Diffserv) tem por finalidade oferecer garantia de qualidade de serviço (QoS) na Internet. A maioria dos estudos sobre Diffserv (DS), no entanto, tem-se concentrado em garantir qualidade de serviço em cada nó da rede, supondo-se que a garantia ...
A maioria dos trabalhos na área de Serviços Diferenciados (DiffServ) tratam a garantia de Qualidade de Serviço (QoS) em cada nó da rede, supondo-se que a garantia individual proporciona uma melhor qualidade de serviço em todo o domínio... more
A maioria dos trabalhos na área de Serviços Diferenciados (DiffServ) tratam a garantia de Qualidade de Serviço (QoS) em cada nó da rede, supondo-se que a garantia individual proporciona uma melhor qualidade de serviço em todo o domínio DiffServ(DS). No entan-to, isso pode ...
Implementaç˜ao de Pol´ıticas de Gerenciamento através ... Marcial Porto Fernandez1 , Aloysio de Castro P. Pedroza2,3 , José Ferreira de Rezende2 ... 1 Instituto de Computaç˜ao - Coordenaç˜ao de Pós-Graduaç˜ao Universidade Federal... more
Implementaç˜ao de Pol´ıticas de Gerenciamento através ... Marcial Porto Fernandez1 , Aloysio de Castro P. Pedroza2,3 , José Ferreira de Rezende2 ... 1 Instituto de Computaç˜ao - Coordenaç˜ao de Pós-Graduaç˜ao Universidade Federal Fluminense (UFF) Rua Passo ...
Resumo - O Gerenciamento Baseado em Políticas é uma téc-nica para coordenar a configuração de diversos equipamentos de uma rede, a partir de contratos administrativos (SLAs). Esses contratos indicam políticas abstratas difíceis de serem... more
Resumo - O Gerenciamento Baseado em Políticas é uma téc-nica para coordenar a configuração de diversos equipamentos de uma rede, a partir de contratos administrativos (SLAs). Esses contratos indicam políticas abstratas difíceis de serem interpretadas e implementadas pelos ...
PBMN is a management technique susceptible to many problems,such as policies that cannot be applied because lack of resources. Thus, there is a need for mechanisms that validate those policies. This work presents an implementation of such... more
PBMN is a management technique susceptible to many problems,such as policies that cannot be applied because lack of resources. Thus, there is a need for mechanisms that validate those policies. This work presents an implementation of such mechanisms for a management ...
Abstract—The wireless networks have been obtain-ing success, allowing user's connectivity anywhere. However, almost all communication systems do not make available the physical location of the users, which turns security... more
Abstract—The wireless networks have been obtain-ing success, allowing user's connectivity anywhere. However, almost all communication systems do not make available the physical location of the users, which turns security administration complex, and also diffi-cults the use of ...
Um Agente Racional para Localização de Usuários em Ambientes de Redes Sem Fio. Gustavo AL de Campos, Filipe M. Roberto, Ana Luiza B. de Paula, Marcial P. Fernandez, Jeandro de M. Bezerra, Joaquim Celestino Jr. ...
Abstract. The progresses in optical technologies have been increased the speeds and capacity of the telecommunication infrastructure. Now the most promising technology to obtain high switching rates is the purely optic switches(OXC), that... more
Abstract. The progresses in optical technologies have been increased the speeds and capacity of the telecommunication infrastructure. Now the most promising technology to obtain high switching rates is the purely optic switches(OXC), that in spite of the high capacity, it still has a lot of ...
Research Interests:
... Acélio Sousa Carvalho de Aguiar, Marcial Porto Fernandez, Jorge Luiz de Castro eSilva, Jeandro de Mesquita Bezerra 1Laboratório de Redes de Computadores e Segurança (LARCES) Universidade Estadual do Ceará (UECE) Av. ...
Page 1. UMA FERRAMENTA INTEGRADA PARA DESENVOLVIMENTO DE PROTOCOLOS (ProtCAD) Gardel Moreira Delfino(1,2) Rodrigo C. Roman (1,3) Marcial Porto Fernandez (1) E-mail : gardel@gta.ufrj.br E-mail :roman@cos.ufrj.br E-mail :... more
Page 1. UMA FERRAMENTA INTEGRADA PARA DESENVOLVIMENTO DE PROTOCOLOS (ProtCAD) Gardel Moreira Delfino(1,2) Rodrigo C. Roman (1,3) Marcial Porto Fernandez (1) E-mail : gardel@gta.ufrj.br E-mail :roman@cos.ufrj.br E-mail : marcial@gta.ufrj.br ...
Message Passing Interface (MPI) is the most popular and widespread model used for distributed parallel programming in high performance computing systems. Stream Control Transmission Protocol (SCTP) is a standard transport layer protocol.... more
Message Passing Interface (MPI) is the most
popular and widespread model used for distributed parallel
programming in high performance computing systems.
Stream Control Transmission Protocol (SCTP) is a standard
transport layer protocol. It supports a lot of features not
supported by transmission control protocol (TCP), recently
the standard transport layer protocol used by MPI, which
make SCTP a promising solution to be used as MPI under
layer protocol. In this work, Multi-streaming and Multihoming,
the most powerful features supported by SCTP, are
used to implement parallel data transmission over
computational networks using all the available paths and
physical interface cards. For this purpose, an application
programming interface API had been designed and used.