6,357 research outputs found

    Automation for network security configuration: state of the art and research trends

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    The size and complexity of modern computer networks are progressively increasing, as a consequence of novel architectural paradigms such as the Internet of Things and network virtualization. Consequently, a manual orchestration and configuration of network security functions is no more feasible, in an environment where cyber attacks can dramatically exploit breaches related to any minimum configuration error. A new frontier is then the introduction of automation in network security configuration, i.e., automatically designing the architecture of security services and the configurations of network security functions, such as firewalls, VPN gateways, etc. This opportunity has been enabled by modern computer networks technologies, such as virtualization. In view of these considerations, the motivations for the introduction of automation in network security configuration are first introduced, alongside with the key automation enablers. Then, the current state of the art in this context is surveyed, focusing on both the achieved improvements and the current limitations. Finally, possible future trends in the field are illustrated

    Beam scanning by liquid-crystal biasing in a modified SIW structure

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    A fixed-frequency beam-scanning 1D antenna based on Liquid Crystals (LCs) is designed for application in 2D scanning with lateral alignment. The 2D array environment imposes full decoupling of adjacent 1D antennas, which often conflicts with the LC requirement of DC biasing: the proposed design accommodates both. The LC medium is placed inside a Substrate Integrated Waveguide (SIW) modified to work as a Groove Gap Waveguide, with radiating slots etched on the upper broad wall, that radiates as a Leaky-Wave Antenna (LWA). This allows effective application of the DC bias voltage needed for tuning the LCs. At the same time, the RF field remains laterally confined, enabling the possibility to lay several antennas in parallel and achieve 2D beam scanning. The design is validated by simulation employing the actual properties of a commercial LC medium

    Museus Portáteis e Outras Histórias da Arte-moda

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    O livro é uma coletânea de textos vinculados aos estudos do grupo de pesquisa História da Arte e Cultura de Moda/UFRGS/CNPq. O grupo de pesquisa que, embora nasça com endereço físico no Instituto de Artes da Universidade Federal do Rio Grande do Sul, extrapola, em muito, fronteiras territoriais e de pensamento. Os autores do livro residem em diferentes regiões da América Latina e com integrantes residentes na Europa também. Essa noção de espacialidade transbordante dimensiona a própria temática da publicação: a Moda em sua transdisciplinaridade inerente, sempre com um “pé” na arte, seja em aproximações ou desvios. Da mesma forma, extrapassa a subárea de conhecimento da História da Arte na diversidade de formações dos autores, oriundos de áreas como história, artes, moda, design, antropologia, filosofia, literatura, educação, comunicação, psicanálise e museologia. A multiplicidade de pesquisas relacionando moda, para além de sua perspectiva mercadológica e sistemática, evidencia o que há de comum a todas essas possibilidades – a saber – algo que sempre acompanha as relações humanas, as práticas do vestir e suas implicações. Implicações que aqui aparecem como imagem, seja na fotografia ou pintura carregadas de memórias, histórias e narrativas; na cultura material de objetos em suas relações familiares, sociais, públicas ou privadas, mas possuindo trajetórias de vida, biografias culturais até chegarem no museu; e ainda, na invisibilidade de corpos sem lugares identitários no espelho do racismo estruturado, mas que reafirmam suas ancestralidades nos entre-lugares da miscigenação e admirável hibridismo cultural. Desse modo, o livro Museus portáteis e outras histórias da Arte-Moda é uma publicação que legitima o Campo da Moda para além da efemeridade, mas trazendo as relações do perene, lidando com corpos que transbordam os modos de vestir e despir, sejam adornos, panos ou ferramentas que expandem os corpos. Corpos reais, em carne e osso ou em sua forma inorgânica nas pinturas e esculturas, mas aquilo que é capaz de dar forma às vestes, ao tecido. E assim, este livro que poderia então, ele próprio, constituir esse Campo da Moda, apresenta sua construção na inter e transdisciplinaridade de áreas que o abordam. Os artigos trazem questões dos corpos e práticas do vestir – a moda – não como algo da esfera do fútil, como fora outorgada tantas vezes, mas algo de fundamental para as questões de resistência, temáticas sobre o corpo feminino, violência, racismo e outros tantos corpos marginalizados. Dessa forma, as reflexões que o livro apresenta são importantes referências para a expansão do Campo como lugar de resistência e pensamento pungente: como a indagação sobre o lugar do indígena, seu povo, cultura e artefatos no museu; ou ainda, a intolerante pergunta sobre o que vestiam as vítimas de violação sexual. Essas são algumas questões relacionadas ao vestir que o Campo da Moda deve se ocupar. Este livro torna-se poética pedagógica, endereçada a pesquisadores, docentes e demais leitores.. “Museus Portáteis”, pois, a roupa, entre as artes e os ofícios, é uma manifestação que se carrega, que se leva às ruas, casas portáteis que nos abrigam, contam narrativas, são matérias históricas e estéticas, e, muitas vezes, devêm objetos de museu

    Measurement of the prompt D0D^0 nuclear modification factor in ppPb collisions at sNN=8.16\sqrt{s_\mathrm{NN}} = 8.16 TeV

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    International audienceThe production of prompt D0D^0 mesons in proton-lead collisions in the forward and backward configurations at a center-of-mass energy per nucleon pair of sNN=8.16 TeV\sqrt{s_\mathrm{NN}} = 8.16~\mathrm{TeV} is measured by the LHCb experiment. The nuclear modification factor of prompt D0D^0 mesons is determined as a function of the transverse momentum pTp_\mathrm{T}, and rapidity in the nucleon-nucleon center-of-mass frame y∗y^*. In the forward rapidity region, significantly suppressed production with respect to pppp collisions is measured, which provides significant constraints of nuclear parton distributions and hadron production down to the very low Bjorken-xx region of ∼10−5\sim 10^{-5}. In the backward rapidity region, a suppression with a significance of 2.0 - 3.8 standard deviations compared to nPDF expectations is found in the kinematic region of pT>6 GeV/cp_\mathrm{T}>6~\mathrm{GeV}/c and −3.25<y∗<−2.5-3.25<y^*<-2.5, corresponding to x∼0.01x\sim 0.01

    The LHCb upgrade I

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    International audienceThe LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their selection in real time. The experiment's tracking system has been completely upgraded with a new pixel vertex detector, a silicon tracker upstream of the dipole magnet and three scintillating fibre tracking stations downstream of the magnet. The whole photon detection system of the RICH detectors has been renewed and the readout electronics of the calorimeter and muon systems have been fully overhauled. The first stage of the all-software trigger is implemented on a GPU farm. The output of the trigger provides a combination of totally reconstructed physics objects, such as tracks and vertices, ready for final analysis, and of entire events which need further offline reprocessing. This scheme required a complete revision of the computing model and rewriting of the experiment's software

    Capturing, Modeling, Overseeing, and Making Credible: The Functions of Vision and Visual Material at the Accademia del Cimento

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    Advances in gut microbiome in metabonomics perspective: based on bibliometrics methods and visualization analysis

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    Background and aimsGastrointestinal microbial metabolomics is closely related to the state of the organism and has significant interaction with the pathogenesis of many diseases. Based on the publications in Web of Science Core Collection(WoSCC) from 2004 to 2022, this study conducted a bibliometric analysis of this field, aiming to understand its development trend and frontier, and provide basic information and potential points for in-depth exploration of this field.MethodsAll articles on gastrointestinal flora and metabolism published from 2004 to 2022 were collected and identified in WoCSS. CiteSpace v.6.1 and VOSviewer v.1.6.15.0 were used to calculate bibliometric indicators, including number of publications and citations, study categories, countries/institutions, authors/co-cited authors, journals/co-cited journals, co-cited references, and keywords. A map was drawn to visualize the data based on the analysis results for a more intuitive view.ResultsThere were 3811 articles in WoSCC that met our criteria. Analysis results show that the number of publications and citations in this field are increasing year by year. China is the country with the highest number of publications and USA owns the highest total link strength and citations. Chinese Acad Sci rank first for the number of institutional publications and total link strength. Journal of Proteome Research has the most publications. Nicholson, Jeremy K. is one of the most important scholars in this field. The most cited reference is “Gut flora metabolism of phosphatidylcholine promotes cardiovascular disease”. Burst detection indicates that Urine, spectroscopy, metabonomic and gut microflora are long-standing hot topics in this field, while autism spectrum disorder and omics are likely to be at the forefront of research. The study of related metabolic small molecules and the application of gastrointestinal microbiome metabolomics in various diseases are currently emerging research directions and frontier in this field.ConclusionThis study is the first to make a bibliometric analysis of the studies related to gastrointestinal microbial metabolomics and reveal the development trends and current research hotspots in this field. This can contribute to the development of the field by providing relevant scholars with valuable and effective information about the current state of the field

    Search for D∗(2007)0→μ+μ−D^{*}(2007)^0\to\mu^+\mu^- in B−→π−μ+μ−B^-\to\pi^-\mu^+\mu^- decays