Helber Wagner - Academia.edu (original) (raw)

Papers by Helber Wagner

Holos, 2021

Uma parcela dos(as) servidores(as) do Campus Canguaretama do Instituto Federal de Educacao, Cienc... more Uma parcela dos(as) servidores(as) do Campus Canguaretama do Instituto Federal de Educacao, Ciencia e Tecnologia do Rio Grande do Norte (IFRN) articulam entre si uma iniciativa de revezamento de carros no deslocamento entre residencia e campus. Contudo, essa iniciativa de carona compartilhada mostra-se limitada na dificuldade em gerenciar o revezamento dos carros ao longo dos dias da semana e na otimizacao da ocupacao das vagas, contribuindo para o aumento da poluicao do ar e do gasto financeiro com combustivel. A luz disso, este trabalho apresenta uma analise da viabilidade de um aplicativo (app) de carona compartilhada focado na rotina de deslocamento dos(as) servidores(as) e capaz de propor um revezamento otimizado dos carros. Para alcancar esse objetivo, seguimos uma abordagem interdisciplinar no escopo da metodologia de desenvolvimento de software denominada Double Diamond que nos permitiu verificar que 53.4% dos(as) servidores(as) vao sozinhos(as) ao campus nos seus carros na ...

2018 International Conference on Computing, Networking and Communications (ICNC), 2018

The integration of Cloud Computing and Internet of Things (IoT) is foreseen as an enabler to suit... more The integration of Cloud Computing and Internet of Things (IoT) is foreseen as an enabler to suit a plethora of novel latency critical applications (e.g, e-health, intelligent transportation, safety, energy, smart cities, and many others). These applications require multimedia (mainly video) flows to be handled by the underlying network in an efficient and scalable way, as they expect to consume a massive data produced by billions of things. In view of this, we propose a dynamic multiuser session control plane which leverages 5G's support of Software-Defined Networking (SDN) substrate to advance beyond todays limited, per-flow IP-based communication systems. We handle such limitations by proposing CLASSICO, a Cross-LAyer Sdn SessIon COntrol architecture that exploits SDN to offload the flow streaming computation operations from the IoT cloud platform to the network edge, affording high timeliness and scalability for the IoT-cloudified system. CLASSICO dynamically builds Application Layer multiuser data sessions and maps them into enhanced group-enabled data paths featuring SDN replication at branching nodes. We applied our solution to multimedia-alike use case, and results show that CLASSICO outperforms typical SDN-enabled IoT systems in terms to Quality of Service (QoS) and Quality of Experience (QoE) video metrics.

As aplicacoes de missao critica (AMC) representam um dos casos de uso mais promissores da Interne... more As aplicacoes de missao critica (AMC) representam um dos casos de uso mais promissores da Internet das Coisas (do ingles, Internet of Things – IoT) ao prometer impactos em areas vitais, como videovigilância inteligente em ambientes com alta densidade humana, trafego de veiculos autonomos com seguranca, cirurgia remota com precisao, dentre muitas outras. As AMC devem explorar o conteudo disponibilizado por plataformas IoT em cenarios de rede IoT softwarizada (IoTS), que nesta tese representa um sistema IoT executando sobre uma infraestrutura de rede cuja arquitetura inclui substrato de rede definida por software para permitir a flexibilidade nas operacoes de controle. Entretanto, as AMC possuem fortes requisitos de Qualidade de Servico (do ingles, Quality of Service - QoS), tais como latencia, jitter e perdas, alem da alta demanda por recursos de rede (e.g., processamento em nos, caminhos e largura de banda nos enlaces) que precisam ser assegurados pela IoTS para garantir eficiencia ...

Revista Conexao UEPG, 2020

Sensors, 2019

The combination of IoT and mobility promises to open a new frontier of innovations in smart envir... more The combination of IoT and mobility promises to open a new frontier of innovations in smart environments, through the advent of the Internet of Moving Things (IoMT) paradigm. In IoMT, an array of IoT devices leverage IP-based mobile connectivity to provide a vast range of data ubiquitously. The IoMT realization will foster smart environments at unprecedented levels, by efficiently affording services and applications whereby today’s technologies make their efficiency unfeasible, such as autonomous driving and in-ambulance remotely-assisted patient. IoMT-supported mission-critical applications push computing and networking requirements to totally new levels that must be met, raising the need for refined approaches that advance beyond existing technologies. In light of this, this paper proposes the Resilient MultiUser Session Control (ReMUSiC) framework, which deploys emerging softwarization and cloudification technologies to afford flexible, optimized and self-organized control plane ...

Future Generation Computer Systems, 2019

The plethora of emerging applications and their increasing popularity has led to the cloudificati... more The plethora of emerging applications and their increasing popularity has led to the cloudification of the Internet of Things (IoT). The IoT-cloudification scales up data centers to a high computational resource capacity, to suit the requirements of a large number of users wanting to access multiple services offered by revolutionary IoT applications which, in turn, consume huge amounts of data produced by billions of things. In such systems, IoT-tailored cloud services (e.g., software platforms and middleware) are responsible for running latency-critical IoT applications in different areas (e.g., healthcare, transport systems, safety, Smart Cities, and many others). These applications expect to produce high-density multimedia flows that must be handled appropriately by the underlying communication infrastructure to obtain transport services of the highest standard. In this work, we propose a novel control plane optimization, which leverages the support of the Software-Defined Networking (SDN) substrate so that it can advance beyond todays IP-based communication systems, which reveals weaknesses (e.g. a limited performance and scalability) in delivering multimedia content through perflow channels. An attempt is made to overcome these limitations by proposing CLASSICO, a Cross-LAyer Sdn SessIon COntrol approach that exploits

International Journal of Information Security, 2014

Wireless mesh networks (WMNs) support multimedia applications that claim for high level of securi... more Wireless mesh networks (WMNs) support multimedia applications that claim for high level of security and performance simultaneously. However, wireless medium and multihop communication allow the action of attackers that can violate data packets or compromise the routing service, reducing performance and quality of service (QoS) of applications. Even in normal conditions of the network, without the presence of attackers, interferences in the shared wireless medium reduce the overall performance of paths. Such aspects require the development of new routing management approaches to address security and performance together. In this work, we integrate a path selection scheme, called CRoss-layer and Adaptive path selection scheme for Balancing performance and security on WMN data routing (CRAB), in the routing service to improve performance and security of multimedia applications, even in face of attacks. Novel results from scenarios under different data traffic patterns representative from multimedia applications show that the CRAB scheme yields a better tradeoff between network performance and security, even when the network is under routing attacks.

2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010

Wireless mesh networks (WMNs) have emerged as support for applications on various domains, such a... more Wireless mesh networks (WMNs) have emerged as support for applications on various domains, such as military,financial and healthcare. Those applications claim for high level of both end-to-end performance and security. However, WMNs are naturally susceptible to security issues that can compromise network performance. This paper presents a cross-layer and adaptive scheme for balancing performance and security on data routing when

2010 International Conference on Network and Service Management, 2010

Wireless mesh networks (WMNs) have emerged to support applications on various domains, such as mi... more Wireless mesh networks (WMNs) have emerged to support applications on various domains, such as military, financial and healthcare, that claim for high level of both security and performance. Since WMNs are susceptible to security issues, and their devices own limitations that can compromise network performance, this paper presents SECOM, a framework for self-configuration of WMNs to provide simultaneously security and

Smart Grid and Renewable Energy, 2012

Environmental sustainability issues and the costs of new power generation and transmission have i... more Environmental sustainability issues and the costs of new power generation and transmission have increased the interest in evolving current power grid to new technologies. The Smart Grid is a promising technology, since it allows a distributed computing approach with potentials for self-diagnosing/-healing, reliable multiuser communication and fast hard real-time control. However, the missing standardization associated with heterogeneity of legacy systems and wide-area service demands, makes very challenging to adopt Smart Grid in a cost-effective way. By considering this, we propose the Session-Oriented Communication System (SOCSys) to overcome the above issues by enhancing Smart Grid with truly reliable and robust capabilities over heterogeneous environments. SOCSys achieves this goal by orchestrating session-control with innovative network-centric facilities operating over a wireless mesh Information Network compliant with IEEE 802.11e/s standard. The simulation results show that SOCSys improved network performance in terms of bandwidth utilization and minimization of delay, while consuming low network resources. Graphical analyses showed that SOCSys supported multimedia sessions with excellent quality, where it outperforms the experiments with regular settings.

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference, 2008

Wireless mesh networks have gained increasing interests, but the lack of security guarantee has r... more Wireless mesh networks have gained increasing interests, but the lack of security guarantee has retarded their deployment. Security solutions have applied preventive or reactive mechanisms, being inefficient to put all attacks off. We design a survivable architecture for ad hoc and mesh networks to enhance the network capability of providing essential services even in face of attacks or intrusions. Our approach integrates preventive, reactive and tolerant defense lines in a self-adaptive way. Based on our architecture, we create a survival path selection scheme, and evaluate it through simulations using urban mesh network mobility and propagation models. Results show a decrease in the impact of routing attacks with minimal performance loss.

NOMS 2008 - 2008 IEEE Network Operations and Management Symposium, 2008

... Routing is a critical operation for MANETs and many secure routing protocols have ... This ap... more ... Routing is a critical operation for MANETs and many secure routing protocols have ... This approach was initially developed to alleviate performance issues, as low throughput, low ... result, they are attractive for improving reliability, load-balancing, energy-conservation, and Quality ...

2008 3rd International Symposium on Wireless Pervasive Computing, 2008

Page 1. Requirements for survivable routing in MANETs Michele N. Lima ∗ , Helber W. da Silva , ... more Page 1. Requirements for survivable routing in MANETs Michele N. Lima ∗ , Helber W. da Silva , Aldri L. dos Santos , Guy Pujolle ∗ ∗ Laboratoire d'Informatique de Paris 6 (LIP6) Université Pierre et Marie Curie Paris, France 75016 {Michele.Nogueira, Guy.Pujolle}@lip6.fr ...

IEEE Transactions on Network and Service Management, 2012

Diálogos em educação: Núcleos formativos, processos de ensino-aprendizagem e demandas contemporâneas, Volume 1