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