Resource management research in Passive Optical Networks (PON)

Next Generation Access Networks (NGAN) are the new step forward to deliver broadband services and to facilitate the integration of different technologies. It is plausible to assume that, from a technological standpoint, the Future Internet will be composed of long-range high-speed optical networks; a number of wireless networks at the edge; and, in between, several access technologies, among which, the Passive Optical Networks (xPON) are very likely to succeed, due to their simplicity, low-cost, and increased bandwidth. Among the different PON technologies, the Ethernet-PON (EPON) is the most promising alternative to satisfy operator and user needs, due to its cost, flexibility and interoperability with other technologies. One of the most interesting challenges in such technologies relates to the scheduling and allocation of resources in the upstream (shared) channel. The aim of this research project is to study and evaluate current contributions and propose new efficient solutions to address the resource allocation issues in Next Generation EPON (NG-EPON). Key issues in this context are future end-user needs, integrated quality of service (QoS) support and optimized service provisioning for real time and elastic flows. This project will unveil research opportunities, issue recommendations and propose novel mechanisms associated with the convergence within heterogeneous access networks and will thus serve as a basis for long-term research projects in this direction. The project has served as a platform for the generation of new concepts and solutions that were published in national and international conferences, scientific journals and also in book chapter. We expect some more research publications in addition to the ones mentioned to be generated in a few months.

Humor na Internet: trabalhadores utilizam nova estratégia para protestar contra demissões e terceirizações

O objetivo neste artigo é analisar de que forma trabalhadores de uma empresa utilizaram o humor para manifestar-se contra demissões e terceirizações ocorridas nos anos 2000. Enquanto ela pregava a implantação de uma nova maneira de ser da empresa, que seria mais moderna, transparente e participativa, os trabalhadores produziram dois vídeos, postados no YouTube, para contar outra história, ridicularizar o discurso oficial e protestar. Ao combinar a utilização do humor com a Internet, os trabalhadores demonstraram sua capacidade de atualizar-se e encontrar novas formas de manifestar-se diante das situações vividas por eles, o que parece ter ampliado seu poder na luta simbólica. Embora as demissões e terceirizações não tenham sido revertidas, a "nova" gestão foi substituída pelos acionistas após dois anos de mandato. Os vídeos foram analisados a partir da técnica de análise de discurso de base francesa, que considera textos orais e escritos como discursos, e com o suporte da semiótica para a análise das imagens que acompanham a letra. A análise indica que os trabalhadores denunciam o rompimento do contrato psicológico estabelecido pela empresa, que se baseava na estabilidade do emprego. Os autores dos vídeos associam a empresa a uma figura feminina, ora mãe, ora amante, e o trabalho nela como algo que estava predestinado em sua vida. Eles demonstram o sentimento de abandono e traição, condizente com esse tipo de situação.

Towards no-scar cardiac surgery - minimally invasive access through umbilicus for aortic valve replacement.

There is an ever-growing trend towards less-invasive procedures in all fields of medicine. We designed an animal study to prove the concept that trans-apical aortic valve replacement from an incision within the umbilicus through a single channel for instruments is feasible, which would be a major leap towards no-scar cardiac surgery. In three adult pigs, after creating a single 3-cm incision at a place where the human umbilicus would be, we introduced a 30F sheath through a tunnel created by an endoscopic vein-harvesting device up to the cardiac apex, through it and up to the left ventricle simulating the approach for trans-apical aortic valve replacement. We used a standard Amplatz nitinol occluder to seal the defect in ventricle wall later. The animals were followed up for 1h. Blood loss was minimal, and no tamponade occurred in any of the animals. In addition, we performed a test with water column static pressure to evaluate the impact of preclotting on the sealing properties of the occluders: 1 min flow-through was 2860+/-176 ml for the standard occluders and 348+/-56 ml for preclotted occluders (p<0.001).

Open minded and open access: introducing NeoBiota, a new peer-reviewed journal of biological invasions

The Editorial presents the focus, scope, policies, and the inaugural issue of NeoBiota, a new open access peer-reviewed journal of biological invasions. The new journal NeoBiota is a continuation of the former NEOBIOTA publication series. The journal will deal with all aspects of invasion biology and impose no restrictions on manuscript size neither on use of color. NeoBiota implies an XML-based editorial workflow and several cutting-edge innovations in publishing and dissemination, such as semantic markup of and enhancements to published texts, data publication, and extensive cross-linking within the journal and to external sources