Contention- and Interference-Aware Flow-Based Routing in Wireless Mesh Networks: Design and Evaluation of a Novel Routing Metric

As the popularity of IEEE 802.11-based Wireless Mesh Networks (WMNs) grows, end users of these environments demand better performance and quality of service (QoS). However, the Medium Access Control (MAC) layer of the IEEE 802.11 standard was not initially designed to provide either multihop or QoS capabilities. Therefore, the performance of IEEE 802.11-based WMNs is not optimal. One approach that can mitigate the limitations of IEEE 802.11-based WMNs relies on routing flows through appropriate paths according to: (i) the characteristics of the flows, (ii) the quality of the WMN links, (iii) the contention in transmission, and (iv) the interference in reception. Considerable research effort has been devoted to this topic. However, as we argue in this paper, a comprehensive solution is still needed. This paper presents the Weighted Contention and Interference routing Metric (WCIM). Extensive simulation results show that WCIM outperforms state-of-the-art solutions.</p

Endocardite por brucelose: relato de caso

JUSTIFICATIVA E OBJETIVOS: A endocardite é rara e grave complicação de brucelose humana. O diagnóstico é suspeito em casos de endocardite sem resposta ao tratamento comum e é confirmado com sorologia com teste de ELISA maior que 1:160. O tratamento na maioria dos casos é cirúrgico, associado a antibioticoterapia prolongada. Alguns casos são resolvidos com tratamento clínico, que inclui doxiciclina, rifampicina, ciproproxacina, gentamicina e tetraciclina. O objetivo deste estudo foi relatar um caso raro de endocardite por brucelose. RELATO DO CASO: Paciente do sexo masculino, 51 anos, trabalhador rural, admitido com quadro de febre e emagrecimento. O ecocardiograma mostrou espessamento e vegetação de válvula aórtica. Uma hemocultura foi positiva para Staphylococcus epidermidis. O tratamento foi iniciado no dia da internação com penicilina cristalina, associada com garamicina, sem melhora em três semanas. Foi suspeitada endocardite por brucelose, colhida sorologia e iniciado o tratamento. Os antibióticos usados foram rifampicina e ciprofloxacin associado à vancomicina, devido o resultado da primeira hemocultura. A sorologia de aglutinação para brucelose foi positiva com resultado de 1:360. O paciente melhorou e recebeu alta da UTI, hemodinamicamente estável e em uso de ciprofloxacin e gentamicina. CONCLUSÕES: A endocardite por brucelose não é comum, mas deve ser sempre lembrada quando o tratamento convencional de endocardite não tem boa resposta, principalmente nos pacientes com possível contato com animais e derivados de leite

Brucella endocarditis: case report

BACKGROUND AND OBJECTIVES: Endocarditis is a rare and serious complication of human brucellosis. The diagnosis is suspected in cases of endocarditis without response to conservative antibiotic treatment and it is confirmed with enzyme-linked immunosorbent assay (ELISA) test, titers being higher than 1:160. The treatment is usually a surgery, followed with antibiotics for long period of time. Some cases can be cured with antibiotic treatment only, with antibiotics such as doxiciclin, rifampicin, ciprofloxacin, gentamicin and tetracycline. We present a case report of a patient with brucellose endocarditis. CASE REPORT: Fifty one year old male patient, a farmer, was admitted with clinical history of fever and weight loss. Echocardiography showed thickening and vegetation on the aortic valve and blood culture was positive for Staphylococcus epidermidis. The treatment with crystal penicillin and garamycin was initiated with no improval during three weeks. Endocarditis caused by human brucellosis was suspected and a new treatment with rifampicin and ciprofloxacin, associated with vancomycin because of the first blood culture, was initiated. Agglutination sorology was positive for brucellosis, with titers of 1:360. The patient got better with new treatment and was dismissed from the intensive care unit clinically stable, taking ciprofloxacin and gentamicin. CONCLUSIONS: Endocarditis caused by human brucellosis is rare; however it should always be considered when conservative antibiotic treatment fails, especially in patients that have contact with animals and dairy products.JUSTIFICATIVA E OBJETIVOS: A endocardite é rara e grave complicação de brucelose humana. O diagnóstico é suspeito em casos de endocardite sem resposta ao tratamento comum e é confirmado com sorologia com teste de ELISA maior que 1:160. O tratamento na maioria dos casos é cirúrgico, associado a antibioticoterapia prolongada. Alguns casos são resolvidos com tratamento clínico, que inclui doxiciclina, rifampicina, ciproproxacina, gentamicina e tetraciclina. O objetivo deste estudo foi relatar um caso raro de endocardite por brucelose. RELATO DO CASO: Paciente do sexo masculino, 51 anos, trabalhador rural, admitido com quadro de febre e emagrecimento. O ecocardiograma mostrou espessamento e vegetação de válvula aórtica. Uma hemocultura foi positiva para Staphylococcus epidermidis. O tratamento foi iniciado no dia da internação com penicilina cristalina, associada com garamicina, sem melhora em três semanas. Foi suspeitada endocardite por brucelose, colhida sorologia e iniciado o tratamento. Os antibióticos usados foram rifampicina e ciprofloxacin associado à vancomicina, devido o resultado da primeira hemocultura. A sorologia de aglutinação para brucelose foi positiva com resultado de 1:360. O paciente melhorou e recebeu alta da UTI, hemodinamicamente estável e em uso de ciprofloxacin e gentamicina. CONCLUSÕES: A endocardite por brucelose não é comum, mas deve ser sempre lembrada quando o tratamento convencional de endocardite não tem boa resposta, principalmente nos pacientes com possível contato com animais e derivados de leite.35435

Intelligent Orchestration of End-to-End Network Slices for the Allocation of Mission Critical Services over NFV Architectures

Part 1: 5th Workshop on “5G – Putting Intelligence to the Network Edge” (5G-PINE 2019)International audienceThe challenge of deploying mission critical services upon virtualised shared network models is the allocation of both radio and cloud resources to the critical actors who require prioritized and high-quality services. This paper describes the design and deployment of an intelligent orchestration cycle to manage end-to-end slices on a NFV architecture. This novel tool includes the monitoring of the network elements at different levels and the processing of the gathered data to produce the corresponding alert mitigation actions

5G-VIOS:Towards next generation intelligent inter-domain network service orchestration and resource optimisation

This paper introduces an intelligent network service orchestration platform, referred to as 5G-VIOS for 5G networks and beyond in accordance with the Zero-touch Network and Service Management (ZSM) paradigm. The proposed solution is responsible for an automated network slicing and life-cycle management of network applications and services, across multiple administrative and technological domains. An Artificial Intelligent (AI) model utilising Machine Learning (ML) techniques is exploited to intelligently and efficiently profile the network services and predict the efficient configuration of resources needed to meet the performance targets and Service Level Agreements (SLAs) of these network services across multiple domains. We test and validate the performance of the prediction models for both resource configuration and utilisation in various settings for different resources and data rates. We also showcase how resource utilisation predictions of a virtualised network service can significantly assist in its life cycle management by proactively preventing unnecessary actions such as its migratio