176 research outputs found
Deep Reinforcement Learning for URLLC data management on top of scheduled eMBB traffic
With the advent of 5G and the research into beyond 5G (B5G) networks, a novel
and very relevant research issue is how to manage the coexistence of different
types of traffic, each with very stringent but completely different
requirements. In this paper we propose a deep reinforcement learning (DRL)
algorithm to slice the available physical layer resources between
ultra-reliable low-latency communications (URLLC) and enhanced Mobile BroadBand
(eMBB) traffic. Specifically, in our setting the time-frequency resource grid
is fully occupied by eMBB traffic and we train the DRL agent to employ proximal
policy optimization (PPO), a state-of-the-art DRL algorithm, to dynamically
allocate the incoming URLLC traffic by puncturing eMBB codewords. Assuming that
each eMBB codeword can tolerate a certain limited amount of puncturing beyond
which is in outage, we show that the policy devised by the DRL agent never
violates the latency requirement of URLLC traffic and, at the same time,
manages to keep the number of eMBB codewords in outage at minimum levels, when
compared to other state-of-the-art schemes.Comment: This work has been submitted to the IEEE for possible publication.
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SAILenv: Learning in Virtual Visual Environments Made Simple
Recently, researchers in Machine Learning algorithms, Computer Vision
scientists, engineers and others, showed a growing interest in 3D simulators as
a mean to artificially create experimental settings that are very close to
those in the real world. However, most of the existing platforms to interface
algorithms with 3D environments are often designed to setup navigation-related
experiments, to study physical interactions, or to handle ad-hoc cases that are
not thought to be customized, sometimes lacking a strong photorealistic
appearance and an easy-to-use software interface. In this paper, we present a
novel platform, SAILenv, that is specifically designed to be simple and
customizable, and that allows researchers to experiment visual recognition in
virtual 3D scenes. A few lines of code are needed to interface every algorithm
with the virtual world, and non-3D-graphics experts can easily customize the 3D
environment itself, exploiting a collection of photorealistic objects. Our
framework yields pixel-level semantic and instance labeling, depth, and, to the
best of our knowledge, it is the only one that provides motion-related
information directly inherited from the 3D engine. The client-server
communication operates at a low level, avoiding the overhead of HTTP-based data
exchanges. We perform experiments using a state-of-the-art object detector
trained on real-world images, showing that it is able to recognize the
photorealistic 3D objects of our environment. The computational burden of the
optical flow compares favourably with the estimation performed using modern
GPU-based convolutional networks or more classic implementations. We believe
that the scientific community will benefit from the easiness and high-quality
of our framework to evaluate newly proposed algorithms in their own customized
realistic conditions.Comment: 8 pages, 7 figures, submitted to ICPR 202
Álbuns de gravura editados por Julio Pacello na coleção do Museu Universitário de Arte da UFU
Julio Pacello was an important publisher of artist´s printed albums in the 1960s and 1970s, of which the Muna - University Art Museum of the Federal University of Uberlândia - has some copies. This article discusses its presence in the museum’s collection, including inventoryinformation, data acquisition and how to determine their significant role when investigated and displayed together. Finally, it focuses the contribution of the publisher, his history and the legacy of such works, analyzing some examples and thus revealing their value and the territory they occupy in the institution.Julio Pacello foi um importante editor de álbuns de gravura nas décadas de 1960 e 1970, dos quais o MUnA - Museu Universitário de Arte da Universidade Federal de Uberlândia - possui alguns exemplares. Este artigo discute sua presença no acervo do museu, tendo em vista as informações do inventário, dados de aquisição e de como determinam um recorte significativo ao ser pensados e expostos conjuntamente. Por fim, cabe discutir a contribuição do editor, sua trajetória e o legado de tais obras, analisando os exemplares citados e portanto, revelando seu valor e o território que ocupam dentro da instituição
Ambiental e Guerrilha: estratégias de arte política no Brasil na década de 1960
A emergência de uma arte política na década de 1960 pode ser vista no contexto da transição entre a ideia modernista de uma arte pura, isolada da realidade, defendida por Clement Greenberg, e a proposta pós-moderna, que devolve a arte a seu contexto, seja ele físico, social, cultural ou linguístico. No caso brasileiro, entre os vários modos de atuação, duas estratégias específicas merecem ser estudadas com mais atenção: a arte ambiental e a arte guerrilha. O artigo propõe identificar as origens de tais propostas, suas semelhanças, diferenças e sobreposições, e examinar teóricos, artistas e obras engajados em cada vertente. Partindo das definições teóricas explicitadas nos discursos artísticos da época e em análises de casos, conclui-se que, de fato, a linha defendida por Mário Pedrosa e Hélio Oiticica e a linha defendida por Décio Pignatari e Frederico Morais não são antagônicas, mas convergentes. Porém, sua diferente recepção aponta para modelos distintos, que continuam a ser adotados pelas gerações mais recentes
SARS-COV-2 Pandemic: How to Maintain a COVID-free Hospital
The emergence of severe acute respiratory syndrome type 2 coronavirus (SARS-CoV-2) and its complications have demonstrated the devastating impact of a new infectious pathogen since the first months of 2020, especially on Health Systems. The work to maintain a COVID-free hospital in terms of reorganization of operational processes and surveillance against SARS-CoV-2 has allowed us to maintain the structure suitable for activities for non-positive patients. The commitment related to this reorganization (not only in terms of costs) is largely satisfied by the responses to the health needs of non-COVID patients. The results obtained during the First Pandemic phase at the Giovanni XXIII Hospital in Monastier di Treviso have allowed the maintenance of the status of a COVID-free hospital. These results are supported by multiple studies in other parts of the world
Rapid, progressive neuropathic arthropathy of the hip in a patient co-infected with human immunodeficiency virus, hepatitis C virus and tertiary syphilis: case report
BACKGROUND: Syphilis is a chronic infection that is classified into
three stages. In its tertiary stage, syphilis spreads to the brain, heart and
other organs; the lesions may involve the skin, mucous membranes and bones.
Neuropathic arthropathy associated with tertiary syphilis has rarely been
described in Europe and its association with HIV-HCV co-infection has not been
reported so far.This article reports the case of a man with tertiary syphilis
presenting with rapidly evolving neuropathic arthropathy of the hip and extensive
bone destruction.
CASE PRESENTATION: On initial presentation, the patient complained of
progressively worsening left-sided coxalgia without localized or generalized
inflammation. The patient reported to have no history of previous infections,
trauma or cancer. Plain x-ray films of the left coxofemoral joint showed marked
degeneration with necrosis of the proximal epiphysis of femur and morphological
alterations of the acetabulum without protrusion. Primary coxarthrosis was
diagnosed and hip arthroplasty was offered, but the patient declined treatment.
Three months later, the patient presented a marked deterioration of his general
condition. He disclosed that he was seropositive for HCV and HIV, as confirmed by
serology. Syphilis serology testing was also positive. A Girdlestone's procedure
was performed and samples were collected for routine cultures for bacteria and
acid fast bacilli, all resulting negative.Although histological findings were
inconclusive, confirmed positive serology for syphilis associated with
progressive arthropathy was strongly suggestive of tertiary syphilis, probably
exacerbated by HIV-HCV co-infection. The patient partially recovered the ability
to walk.
CONCLUSIONS: Due to the resurgence of syphilis, this disease should be considered
as a possible cause of neuropathic arthropathy when other infectious causes have
been ruled out, particularly in patients with HIV and/or HCV co-infection
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