2,229 research outputs found
Testing the normality of the gravitational wave data with a low cost recursive estimate of the kurtosis
We propose a monitoring indicator of the normality of the output of a
gravitational wave detector. This indicator is based on the estimation of the
kurtosis (i.e., the 4th order statistical moment normalized by the variance
squared) of the data selected in a time sliding window. We show how a low cost
(because recursive) implementation of such estimation is possible and we
illustrate the validity of the presented approach with a few examples using
simulated random noises.Comment: 4 pages, 3 figures. In the Proceedings of the 3rd workshop on Physics
in Signal and Image Processing (Grenoble), 200
Data analysis challenges in transient gravitational-wave astronomy
Gravitational waves are radiative solutions of space-time dynamics predicted
by Einstein's theory of General Relativity. A world-wide array of large-scale
and highly sensitive interferometric detectors constantly scrutinizes the
geometry of the local space-time with the hope to detect deviations that would
signal an impinging gravitational wave from a remote astrophysical source.
Finding the rare and weak signature of gravitational waves buried in
non-stationary and non-Gaussian instrument noise is a particularly challenging
problem. We will give an overview of the data-analysis techniques and
associated observational results obtained so far by Virgo (in Europe) and LIGO
(in the US), along with the prospects offered by the up-coming advanced
versions of those detectors.Comment: 7 pages, 5 figures, Proceedings of the ARENA'12 Conference, few minor
change
A chance to seize by women in francophone Africa
A rather disillusioned observation was recently made during a pan-Africa conference: Africa women consider new information and communication technologies as "futuristic" rather than a tool for development to be used today. If initiatives are not taken now to thwart this attitude, activities by women in Africa to promote sustainable development that also benefit them will take event longer. This will be especially true in regions on the continent where English is not the common language
Adaptive filtering techniques for interferometric data preparation: removal of long-term sinusoidal signals and oscillatory transients
We propose an adaptive denoising scheme for poorly modeled non-Gaussian
features in the gravitational wave interferometric data. Preliminary tests on
real data show encouraging results.Comment: 4 pages, 2 figures. Proceedings of GWDAW99 (Roma, Dec. 1999), to
appear in Int. J. Mod. Phys.
NetLSD: Hearing the Shape of a Graph
Comparison among graphs is ubiquitous in graph analytics. However, it is a
hard task in terms of the expressiveness of the employed similarity measure and
the efficiency of its computation. Ideally, graph comparison should be
invariant to the order of nodes and the sizes of compared graphs, adaptive to
the scale of graph patterns, and scalable. Unfortunately, these properties have
not been addressed together. Graph comparisons still rely on direct approaches,
graph kernels, or representation-based methods, which are all inefficient and
impractical for large graph collections.
In this paper, we propose the Network Laplacian Spectral Descriptor (NetLSD):
the first, to our knowledge, permutation- and size-invariant, scale-adaptive,
and efficiently computable graph representation method that allows for
straightforward comparisons of large graphs. NetLSD extracts a compact
signature that inherits the formal properties of the Laplacian spectrum,
specifically its heat or wave kernel; thus, it hears the shape of a graph. Our
evaluation on a variety of real-world graphs demonstrates that it outperforms
previous works in both expressiveness and efficiency.Comment: KDD '18: The 24th ACM SIGKDD International Conference on Knowledge
Discovery & Data Mining, August 19--23, 2018, London, United Kingdo
Ambientes colaborativos no trabalho e no ensino: o papel da arquitetura de interiores frente à inovação. Um olhar sobre a obra de Woods Bagot
O presente artigo visa promover a reflexão sobre a importância da arquitetura de interiores em projetos de ambientes colaborativos para o trabalho e para o ensino, frente às transformações da sociedade. São apresentados quatro casos do escritório Woods Bagot, referência em projetos inovadores na área de arquitetura, buscando elucidar a composição dos espaços internos e suas características principais frente à inovação objetivando contribuir para a prática em arquitetura de interiores.This article aims to promote the reflection on the importance of interior
architecture in projects of collaborative spaces for work and teaching, in
face of the transformations of society. Four cases of Woods Bagot office, a
reference in innovative projects in the area of interior architecture, are
presented, with the object of elucidating the composition of the internal
spaces and their main characteristics against innovation contributing to
the practice in interior architecture
The diasporization of population in context of (in)security: the transnationalization of the security border
The study of diaspora has generally meant the study of transnational cultural
practices and transnational politics, as if we can understand the complexity of the
diasporic identity by only focalizing on its effects. In this presentation we try to
reverse this perspective by firstly theorizing one of the specific contexts where
population can and is appealed to in order to produce a diasporic identity. This
context, namely the (in)security context, will be explored by using concepts from
critical security studies that emphasise the impact of state security practice on the
process of diasporization. In our view diaspora as a practice used by population
whom are subject to an (in)security context can be seen as a specific strategy of
governmentality. Indeed this category attributes particular desecuritizating
functions to those identified as diasporic, thus involving them as actors in the
transnationalization of the security border of the state in which they are living
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