3,647 research outputs found
Analysis of Software Binaries for Reengineering-Driven Product Line Architecture\^aAn Industrial Case Study
This paper describes a method for the recovering of software architectures
from a set of similar (but unrelated) software products in binary form. One
intention is to drive refactoring into software product lines and combine
architecture recovery with run time binary analysis and existing clustering
methods. Using our runtime binary analysis, we create graphs that capture the
dependencies between different software parts. These are clustered into smaller
component graphs, that group software parts with high interactions into larger
entities. The component graphs serve as a basis for further software product
line work. In this paper, we concentrate on the analysis part of the method and
the graph clustering. We apply the graph clustering method to a real
application in the context of automation / robot configuration software tools.Comment: In Proceedings FMSPLE 2015, arXiv:1504.0301
BOSS-LDG: A Novel Computational Framework that Brings Together Blue Waters, Open Science Grid, Shifter and the LIGO Data Grid to Accelerate Gravitational Wave Discovery
We present a novel computational framework that connects Blue Waters, the
NSF-supported, leadership-class supercomputer operated by NCSA, to the Laser
Interferometer Gravitational-Wave Observatory (LIGO) Data Grid via Open Science
Grid technology. To enable this computational infrastructure, we configured,
for the first time, a LIGO Data Grid Tier-1 Center that can submit
heterogeneous LIGO workflows using Open Science Grid facilities. In order to
enable a seamless connection between the LIGO Data Grid and Blue Waters via
Open Science Grid, we utilize Shifter to containerize LIGO's workflow software.
This work represents the first time Open Science Grid, Shifter, and Blue Waters
are unified to tackle a scientific problem and, in particular, it is the first
time a framework of this nature is used in the context of large scale
gravitational wave data analysis. This new framework has been used in the last
several weeks of LIGO's second discovery campaign to run the most
computationally demanding gravitational wave search workflows on Blue Waters,
and accelerate discovery in the emergent field of gravitational wave
astrophysics. We discuss the implications of this novel framework for a wider
ecosystem of Higher Performance Computing users.Comment: 10 pages, 10 figures. Accepted as a Full Research Paper to the 13th
IEEE International Conference on eScienc
Exploring hybridity in food supply chains
In recent years, a number of dynamic aspects of food supply chains have attracted great interest among social scientists investigating rural restructuring and change. These include: the expansion of organic agriculture; the development of new value added enterprises at farm level and the revitalisation of traditional and new-old artisanal production practices; the expansion from a low base of the market share of alternative short supply chains, such as farmers markets; and the so-called quality turn, riding on the heels of another turn in rural social research - the consumption turn. All of these changes come together in a vision of alternative agro food networks (AAFNs) that has been built around empirical and theoretical work from a number of predominantly European social researchers, centred on Wageningen, but conducted in a number of countries in Europe. These and other associated changes in the composition of farm-based economic activity are seen to be constitutive of a new paradigm of rural development comprising an alternative network of producers, consumers and other actors in relation to the mainstream agro-food system (Van der Ploeg et al. 2000; Van der Ploeg and Renting 2004; Renting et al. 2003). The theorisation surrounding this work on AAFNs has been sharply criticised by Goodman (2004). He challenges the vision of certain European social scientists of an alternative food sector rising like a phoenix from the ashes of the commodity-based food system to constitute a new paradigm of rural development. He notes their view of AAFNs as: innovative precursors of paradigm change, of a more endogenous, territorialized and ecologically embedded successor to the allegedly crisis-ridden modernisation model of conventional industrialised agriculture. (Goodman 2004:6) In particular, he challenges the binary categorisation into alternative and mainstream and is deeply sceptical as to the existence of a new paradigm while, at the same time, highly cognisant of dynamic changes within the agro-food sector. This paper is motivated by a desire to explore the extent to which different theories can help interpret and explain some of the most dynamic areas of agro-food systems that belong neither in the mainstream food supply chains and networks, nor in the alternative food supply networks. We review two areas where we argue that hybridity is evident in food supply chains and networks, and draw conclusions as to the research needs in a field where too often dualistic interpretations have prevailed.Agribusiness,
On ab initio-based, free and closed-form expressions for gravitational waves
We introduce a new approach for fnding high accuracy, free and closed-form expressions for the gravitational waves emitted by binary black hole collisions from ab initio models. More precisely, our expressions are built from numerical surrogate models based on supercomputer simulations of the Einstein equations, which have been shown to be essentially indistinguishable from each other. Distinct aspects of our approach are that: (i) representations of the gravitational waves can be explicitly written in a few lines, (ii) these representations are free-form yet still fast to search for and validate and (iii) there are no underlying physical approximations in the underlying model. The key strategy is combining techniques from Artifcial Intelligence and Reduced Order Modeling for parameterized systems. Namely, symbolic regression through genetic programming combined with sparse representations in parameter space and the time domain using Reduced Basis and the Empirical Interpolation Method enabling fast free-form symbolic searches and large-scale a posteriori validations. As a proof of concept we present our results for the collision of two black holes, initially without spin, and with an initial separation corresponding to 25–31 gravitational wave cycles before merger. The minimum overlap, compared to ground truth solutions, is 99%. That is, 1% diference between our closed-form expressions and supercomputer simulations; this is considered for gravitational (GW) science more than the minimum required due to experimental numerical errors which otherwise dominate. This paper aims to contribute to the feld of GWs in particular and Artifcial Intelligence in general.Fil: Tiglio, Manuel. Universidad Nacional de Córdoba. Facultad de Matemática, AstronomÃa y FÃsica. Sección Ciencias de la Computación; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Córdoba; ArgentinaFil: Villanueva, Uziel Aarón. Universidad Nacional de Córdoba. Facultad de Matemática, AstronomÃa y FÃsica. Sección Ciencias de la Computación; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Córdoba; Argentin
Moving in, out, through, and beyond the tensions between experience and social construction in somatic theory
This article is a reflexive analysis of the author’s movement through the positions of different somatic theories. While some somatic theorists and practitioners focus on ideas of self and experiential knowledge, others are moving into a more postmodern realm by looking at bodies and somatic experience as social constructions. The author traces her movement through these theories and towards a non-binary postmodern view of somatics that does not dismiss the role of experience. Two narratives serve as a vehicle whereby the author wrestles with the issues
Reduced Order and Surrogate Models for Gravitational Waves
We present an introduction to some of the state of the art in reduced order
and surrogate modeling in gravitational wave (GW) science. Approaches that we
cover include Principal Component Analysis, Proper Orthogonal Decomposition,
the Reduced Basis approach, the Empirical Interpolation Method, Reduced Order
Quadratures, and Compressed Likelihood evaluations. We divide the review into
three parts: representation/compression of known data, predictive models, and
data analysis. The targeted audience is that one of practitioners in GW
science, a field in which building predictive models and data analysis tools
that are both accurate and fast to evaluate, especially when dealing with large
amounts of data and intensive computations, are necessary yet can be
challenging. As such, practical presentations and, sometimes, heuristic
approaches are here preferred over rigor when the latter is not available. This
review aims to be self-contained, within reasonable page limits, with little
previous knowledge (at the undergraduate level) requirements in mathematics,
scientific computing, and other disciplines. Emphasis is placed on optimality,
as well as the curse of dimensionality and approaches that might have the
promise of beating it. We also review most of the state of the art of GW
surrogates. Some numerical algorithms, conditioning details, scalability,
parallelization and other practical points are discussed. The approaches
presented are to large extent non-intrusive and data-driven and can therefore
be applicable to other disciplines. We close with open challenges in high
dimension surrogates, which are not unique to GW science.Comment: Invited article for Living Reviews in Relativity. 93 page
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