NOTAS E RESENHAS

PIERRE MONBEIG, O PATRIARCA DA GEOGRAFIA PAULISTA E NACIONAL - Silvio Carlos BRAY FORMAÇÃO DE GEÓGRAFOS NA REPÚBLICA DEMOCRÁTICA ALEMÃ - Sylvio C. BANDEIRA DE MELLO E SILVA IMPACTO AMBIENTAL NA REGIÃO DE BRASILIA: AS CASCALHEIRAS - Maria NOVAES PINTO; Luiz Gonzaga FONSECA; Fernando MONTEIRO RIBEIRO IMPORTÂNCIA DO MONITORAMENTO EM AREAS AGRÍCOLAS - Miguel Cezar SANCHEZ; Nanci Aparecida VISACCHERO ANÁLISE DA QUALIDADE HÍDRICA PELA APLICAÇÃO DE BIO-INDICADORES (Contribuição aos Estudos Biogeográficos de Ambientes Aquáticos) - Adler G. VIADANA O TRABALHO INFORMAL NAS METRÓPOLES BRASILEIRAS: UMA ANÁLISE COMPARATIVA - Pedro DE ALMEIDA VASCONCELOS A VARIABILIDADE DAS TEMPERATURAS EM FUNÇÃO DE CARACTERÍSTICAS DAS VERTENTES - Anderson Luis HEBLING CHRISTOFOLETTI; Maria Juraci ZANI DOS SANTOS; Nádia Regina DO NASCIMENTO MIGRAÇÃO INTRA-URBANA: ALGUNS PROBLEMAS PARA A IMPLEMENTAÇÃO DE PROJETOS DE INVESTIGAÇÃO - Odeibler SANTO GUIDUGLI GEOGRAFIA INDUSTRIAL - Silvia SELINGARDI SAMPAIO DA VIDA BUCÓLICA AO USO DO SOLO E EXPLORAÇÃO DOS RECURSOS NATURAIS - Antonio CHRISTOFOLLETTI PROCESSOS POLÍTICOS E SÓCIO-ECONÔMICOS ATUANTES NA ORGANIZAÇÃO DOS SISTEMAS ESPACIAIS - Antonio CHRISTOFOLLETTI PROBLEMÁTICAS FOCALIZADAS EM GEOGRAFIA URBANA - Antonio CHRISTOFOLLETTI GEOGRAFIA DA POPULAÇÃO - Odeibler SANTO GUIDUGLI APLICAÇÕES HIDROLÓGICAS DA TECNOLOGIA ESPACIAL - Maria Isabel C. DE FREITAS RECURSOS ECONÔMICOS - Lucy Marion CALDERINI PHILADELPHO MACHADO AVALIAÇÃO ECONÔMICA DO MEIO AMBIENTE, SISTEMAS NATURAIS E DESENVOLVIMENTO - Ana Tereza CORTEZ MORAES BIOGEOGRAFIA E MEIO AMBIENTE - Walter Cecílio BRINO A TRANSIÇÃO TECNOLÓGICA EM CARTOGRAFIA - Miguel Cezar SANCHEZ MACMILLAN DICTIONARY OF THE ENVIRONMENT - Rolando BERRÍOS EARTH SCIENCE (PUPIL EDITION) - M. O. UMENWEKE EARTH SCIENCE (TEACHER EDlTION) - M. O. UMENWEK

Survivable Virtual Network Mapping against Double-Link Failures Based on Virtual Network Capacity Sharing

Network Slicing is one of the key enabling technologies in 5G networks, as it allows the same network infrastructure to host numerous services, characterized by different Quality of Service (QoS) requirements. Network slicing provides greater flexibility when assigning resources to virtual networks (VNs, or, equivalently, 'network slices'), allowing to meet very diverse service requirements. However, network slicing also brings numerous challenges in terms of management of network resources. Among these, service reliability is one of the most important, especially in light of the rising importance of ultra-reliable services in 5G. In this study, we investigate the Survivable Virtual Network Mapping (SVNM) problem focusing on double-link failures. SVNM against double-link failures can be guaranteed enforcing appropriate SVNM constraints, but this approach requires excessive redundant capacity. Capacity sharing represents a more capacity-efficient solution to ensure survivability against double-link failures. Hence, we propose a new SVNM strategy that allows capacity sharing across different virtual networks in case of double-link failure. To evaluate benefits of the proposed technique we categorize six different SVNM scenarios (with and without capacity sharing, jointly applied with SVNM or not) and formalize them through Integer Linear Programming (ILP) models. Results show that the proposed technique for SVNM with capacity sharing enables availability gains (up to about 29%) over traditional SVNM against single-link failures and significant capacity savings (up to about 50%) over SVNM against double-link failures. The advantages are more significant for increasing number of virtual networks

Integrated production optimization through model-based decision support and advanced optimization techniques

International audienceThe Production Optimization is one of the most complex and multi-disciplinary task in the oil&gas industry from an operational point of view: it involves the surface asset during all its production life and requires a continuous improvement process. In the gathering facilities and process plant engineering design, the optimization is driven by inputs that are subjected, during the asset life, to changes; this fact, coupled to improvements and modifications in surface facilities, creates the necessity to manage and optimize production scenarios with a more frequent time-frame. Technology improvements have enabled a widespread use of integrated simulation models for a better asset management to be fully combined with measured field data. In this paper we present a dedicated workflow for surface facilities – gathering system and process plant – production enhancement and management coupled with an advanced optimization technique based on a powerful algorithm. The main feature of this algorithm – and consequently of the proposed workflow – is the ability to control many variables simultaneously according to the system constraints even with complex, conflicting and non-direct interconnections between them and the objective to be reached. It has been proven that this algorithm has a robust practice that detects the global optimum of the feasible area avoiding a premature stop in a local optimum region, a situation quite common in highly-constrained and non-linear optimization problems in oil&gas industry. The technical contributions of the work are the abilities to support operations in: definition of field potential, production optimization and de-bottlenecking activities. In the paper a case study that tackles a more complex situation presented in [1], is reported; the proposed workflow’s results are compared with another integrated optimization software available from other software-house, showing an improved ability to detect global optimum combining well management to the plant capabiliti