SBC

Existen muchas razones para que las empresas se embarquen en la migración a troncales SIP con Session Border Controllers: reducción de los costes de comunicación, mayor fiabilidad, mayor velocidad en la introducción de nuevos servicios, centralización de infraestructura y aplicaciones, gestión de la red más sencilla, etc

If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large. ... Software component provided by Boston College Department of Economics in its series Statistical Software Components with number S4010201. ... This item is not listed on Wikipedia, on a reading list or among the top items on IDEAS. ... If you have authored this item and are not yet registered with RePEc, we ...

Resumo. Restauração de imagem é uma importante etapa de qualquer sistema de computação gráfica. Este trabalho tem como objetivo apresentar e avaliar o paralelismo de Denoiser, uma aplicação para detecção e eliminação de ruído em streaming de vídeo. Foram avaliados o speed-up e programabilidade das interfaces SPar, Thread Building Blocks e FastFlow. Os resultados mostram que a SPar obteve bons resultados de programabilidade e desempenho.

This paper shows an example of how role playing games can be used for two complementary purposes: to help at extracting the expertise of social actors, but also to support their participation in decision making. These two objectives correspond, respectively, to the 2nd grand challenge (computational modeling of complex systems) and to the 4th one (participatory access to knowledge). Our approach combines distributed role playing, geographic information systems, support for player negotiations and insertion of various types of artificial agents. We are exploring it in the context of participatory management of protected areas, for biodiversity conservation and social inclusion.

A maioria das soluções para IoT, com intuito de reduzir o consumo de energia, assume severas restriçõesá taxa de comunicação limitando-as para o uso de aplicações onde os sensores captam pequenas quantidades de dados. Por isso, estas soluções n ão s ão adequadas para o monitoramento de animais silvestres, que exige a transmiss ão de grandes quantidades de fotos capturadas por c âmeras trap instaladas no meio das florestas. Além disso o ambiente florestal também prejudica a capacidade de transmiss ão. Portanto, este trabalho prop õe a coleta de dados de dispositivos na floresta com o auxílio de drones. Assim, este artigo visa avaliar o desempenho de uma rede sem fio para a comunicação entre o drone e os dispositivos de captura de imagem. Para tal, s ão avaliadas as principais métricas de rede, tais como alcance máximo, taxa de transmiss ão e perda de pacotes. A título de comparação e para melhor caracterizar a transmiss ão na floresta, s ão realizados testes em outros cenários. O res...

ABSTRACT A spectral beam combiner (SBC) based on multiplexed volume Bragg gratings ( VBGs) is demonstrated and presented. A new architecture for SBC with multiple VBGs recorded into a single piece of photo-thermo-refractive (PTR) glass is presented which significantly reduces the footprint of the spectral beam combiner. For this new architecture, multiple VBGs have been recorded into one PTR glass sample. For each VBG recorded into the glass, one laser beam can be diffracted from it allowing each beam combining element to diffract multiple beams into the common beam path. A spectral beam combiner based on multiplexed VBGs is demonstrated and presented.

Ataques DDoS são uma grande ameaça. Para mitigar seu impacto, sua detecção deve, preferencialmente, ocorrer na borda da rede, próximo à origem do ataque. Para tal, o uso de roteadores domésticos é uma opção. Entretanto, esses dispositivos são tipicamente limitados, tornando inadequadas as abordagens baseadas, por exemplo, em DPI. Propomos uma abordagem extremamente leve para detecção de DDoS usando roteadores domésticos que emprega exclusivamente contadores de bytes de interfaces de rede. Para detectar ataques com informações tão limitadas, usamos modelos de Machine Learning treinados com dados de centenas de usuários domésticos, obtidos através de parceria com um ISP, juntamente com ataques gerados em ambiente controlado usando as botnets Mirai e BASHLITE. Nossos classificadores são capazes de detectar diferentes vetores de ataque com F1 scores tipicamente superiores a 0,99.

This paper presents results from employing an econometric approach to examine the determinants of scientific production at cross-country level. The aim of this paper is not to provide accurate and robust estimates of investment elasticities (a doubtful task given the poor quality of the data sources and the modelling problems), but to develop and critically assess the validity of an empirical approach for characterising the production of science and its impact from a comparative perspective. We employ and discuss the limitations of a production function approach to relate investment inputs to scientific outputs using a sample of 14 countries for which we have information about Higher Education Research and Development (HERD). The outputs are taken from the Thomson ISI® National Science Indicators (2002) database on published papers and citations. The inputs and outputs for this sample of countries have been recorded for a period of 21 years (1981-2002). A thorough discussion of data...

The present study aimed to investigate the effectiveness of platelet-rich fibrin (PRF) on bone regeneration when used alone or in combination with hydroxyapatite (HA)/beta-tricalcium phosphate (βTCP). In this study, 20 New Zealand white rabbits were used and four calvarial defects were prepared in each animal. PRF, Straumann(®) Bone Ceramic (SBC), or PRF+SBC was applied to the defects; one defect was left untreated as a control. Ten rabbits were sacrificed at week 4 (T1) and 10 at week 8 (T2). After micro-computed tomography (micro-CT) scanning, the samples were sent for histological and histomorphometric analysis to evaluate and compare the volume and area of regenerated bone. Histomorphometric and micro-CT analysis showed that both PRF and SBC significantly increased bone regeneration at T1 and T2 (P<0.01). When PRF was used in combination with HA/βTCP, a further significant increase in new bone formation was observed at T1 and T2 compared with that when PRF or SBC was used alone (P<0.01). PRF has a positive effect on bone formation when used alone and in combination with HA/βTCP.