2,706 research outputs found
Pacemapping
Pacemapping (PM) is an electrophysiologic technique designed to help locating tachycardia sources by stimulating at different endocardial sites in order to reproduce the clinical tachycardia characteristics. A recorded electrocardiogram (ECG) during the clinical tachycardia has been conventionally used as reference. Yet, endocardial activation pattern during tachycardia may be utilized as well to guide the procedure. In focal tachycardia ablation, PM guide has consistently provided remarkable outcomes1, while outcomes in reentrant tachycardia ablation are less favourabl
Tratamento do pĂŞnfigo vulgar e pĂŞnfigo foliáceo: experiĂŞncia com 71 pacientes no perĂodo de 20 anos
Quarenta e um casos de pĂŞnfigo vulgar e trinta casos de pĂŞnfigo foliáceo foram investigados no Hospital Universitário Clementino Fraga Filho, no perĂodo 1978-1999. Os pacientes foram divididos em dois grupos de tratamento: um recebendo atĂ© 100 mg/dia de prednisona e o outro grupo >;120 mg diariamente. Com o primeiro esquema, houve bom controle inicial dos pĂŞnfigos sem aumento da taxa de mortalidade associada Ă s doenças. A dose acima de 120 mg induziu maior morbidade. Os resultados permitiram estabelecer um esquema de prednisona (1-2 mg/kg/dia) com dose máxima de 120 mg diários no tratamento dos pĂŞnfigos vulgar e foliáceo.Forty one cases of pemphigus vulgaris and thirty cases of pemphigus foliaceus were investigated at Hospital Universitário Clementino Fraga Filho from 1978 to 1999. They were divided into two treatment groups: one group received up to 100 mg of oral prednisone daily and the other group received >;120 mg daily. The dose up to 100 mg provided good initial control of pemphigus vulgaris and pemphigus foliaceus and did not increase the mortality rate associated to disease. The dose >;120 mg induced higher morbidity. These data allowed us to establish a regimen of oral prednisone (1-2 mg/kg/daily) with maximum of 120 mg daily in the treatment of pemphigus vulgaris and pemphigus foliaceus
Principal-agent dynamic interaction in the context of the lifecycle operation of infrastructure systems
A Public-private partnership (PPP) is contract framework designed to carry out public works in the hope that the more advanced knowledge and financial support of private agents may be advantageous to develop better infrastructure projects that serve public needs. This relationship, which is embodied by a principal (e.g., government) and an agent (e.g., independent contractor), is inherently conflictive. Three main factors give rise to such conflict: the interests of the public and private party do not generally coincide, there is information asymmetry between them and their interaction unfolds in environments under uncertainty. Traditionally, the regulations put forth to mitigate the cost overruns caused by moral hazard, low performance levels and litigations are determined by methods which neither take into account a formal mathematical description of the interaction among participants nor the deterioration of physical components and their susceptibility to natural hazards. In this paper we propose an alternative approach that addresses these issues. We describe an agent-based model which represents the infrastructure system as an entity that is affected by the operations of three players: principal, agent and nature. They perform operations on the infrastructure, based on their own strategies and perceived payoffs, but are bound by a contract that constraint their actions. The purpose of the model is to simulate the interaction history among players and compute the resulting outcome in the form of the utility that each player receives. The model can be used within an optimization routine to determine which contractual rules maximize the utility for both players simultaneously
NTU RGB+D 120: A Large-Scale Benchmark for 3D Human Activity Understanding
Research on depth-based human activity analysis achieved outstanding
performance and demonstrated the effectiveness of 3D representation for action
recognition. The existing depth-based and RGB+D-based action recognition
benchmarks have a number of limitations, including the lack of large-scale
training samples, realistic number of distinct class categories, diversity in
camera views, varied environmental conditions, and variety of human subjects.
In this work, we introduce a large-scale dataset for RGB+D human action
recognition, which is collected from 106 distinct subjects and contains more
than 114 thousand video samples and 8 million frames. This dataset contains 120
different action classes including daily, mutual, and health-related
activities. We evaluate the performance of a series of existing 3D activity
analysis methods on this dataset, and show the advantage of applying deep
learning methods for 3D-based human action recognition. Furthermore, we
investigate a novel one-shot 3D activity recognition problem on our dataset,
and a simple yet effective Action-Part Semantic Relevance-aware (APSR)
framework is proposed for this task, which yields promising results for
recognition of the novel action classes. We believe the introduction of this
large-scale dataset will enable the community to apply, adapt, and develop
various data-hungry learning techniques for depth-based and RGB+D-based human
activity understanding. [The dataset is available at:
http://rose1.ntu.edu.sg/Datasets/actionRecognition.asp]Comment: IEEE Transactions on Pattern Analysis and Machine Intelligence
(TPAMI
Skeleton-based Relational Reasoning for Group Activity Analysis
Research on group activity recognition mostly leans on the standard
two-stream approach (RGB and Optical Flow) as their input features. Few have
explored explicit pose information, with none using it directly to reason about
the persons interactions. In this paper, we leverage the skeleton information
to learn the interactions between the individuals straight from it. With our
proposed method GIRN, multiple relationship types are inferred from independent
modules, that describe the relations between the body joints pair-by-pair.
Additionally to the joints relations, we also experiment with the previously
unexplored relationship between individuals and relevant objects (e.g.
volleyball). The individuals distinct relations are then merged through an
attention mechanism, that gives more importance to those individuals more
relevant for distinguishing the group activity. We evaluate our method in the
Volleyball dataset, obtaining competitive results to the state-of-the-art. Our
experiments demonstrate the potential of skeleton-based approaches for modeling
multi-person interactions.Comment: 26 pages, 5 figures, accepted manuscript in Elsevier Pattern
Recognition, minor writing revisions and new reference
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