1,721,038 research outputs found
Designing Self-organising MAS Environments: The Collective Sort Case
No full textSelf-organisation is being recognised as an effective conceptual framework to deal with the complexity inherent to modern artificial systems. In this article, we explore the applicability of self-organisation principles to the development of multi-agent system (MAS) environments. First, we discuss a methodological approach for the engineering of complex systems, which features emergent properties: this is based on formal modelling and stochastic simulation, used to analyse global system dynamics and tune system parameters at the early stages of design. Then, as a suitable target for this approach, we describe an architecture for self-organising environments featuring artifacts and environmental agents as fundamental entities.
As an example, we analyse a MAS distributed environment made of tuple spaces, where environmental agents are assigned the task of moving tuples across tuples spaces in background and according to local criteria, making complete clustering an emergent property achieved through self-organisation
Prototyping A&A ReSpecT in Maude
No full textAbstractThe formal modelling of programming languages has always been a challenging activity due to the gap occurring between formal definition and actual implementation. On the other hand, the Maude rewriting language has already proven to be a suitable tool to bridge the gap between theory and practice when implementing the operational semantics of programming languages. In particular, Maude has been exploited to model languages belonging to different paradigms and levels of abstraction, leading to specifications that represent de facto executable prototypes of such languages.In this paper we focus on A&A ReSpecT, a coordination language based on the agents and artifacts (A&A) meta-model, and exploit Maude to generate an execution machine for A&A ReSpecT programs, acting as an implementation of its operational semantics
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Cinque domande sulla critica
No full textRisposta a un questionario sulla critica presentato dalla rivista "Allegoria" (a cura di G. Policastro e E. Zinato) e rivolto ai seguenti studiosi:Giancarlo Alfano Cecilia Bello Minciacchi, Clotilde Bertoni, Federico Bertoni, Raoul Bruni, Alberto Casadei, Matteo Di Gesù, Daniele Giglioli, Claudio Giunta, Gabriele Pedullà, Pierluigi Pellini, Gianluigi Simonetti, Italo Testa Antonio Tricomi, Paolo Zublena
Cinque domande sulla critica
No full textRisposta a un questionario sulla critica (e sul campo letterario contemporaneo) organizzato dalla rivista "Allegoria" a cura di G. Policastro e E. Zinato e rivolto ai seguenti studiosi:Giancarlo Alfano
Cecilia Bello Minciacchi, Clotilde Bertoni, Federico Bertoni, Raoul Bruni, Alberto Casadei, Matteo Di Gesù, Daniele Giglioli, Claudio Giunta, Gabriele Pedullà, Pierluigi Pellini, Gianluigi Simonetti, Italo Testa
Antonio Tricomi, Paolo Zublena
Spatial coordination of pervasive systems through chemical-inspired tuple spaces
No full textPervasive computing calls for developing distributed infrastructures featuring large-scale distribution, opennes, context-awareness, self-organisation and self-adaptation. There, it is quite natural to see services (software functionality, data, knowledge, signals) as spatial concepts: they are naturally diffused in the network, and in each location they are sensitive to the context and compete with each other - as such, they can be active in one or multiple regions (niches) of the network. To support and engineer this scenario, we propose a nature-inspired coordination model of chemical-inspired tuple spaces. They extend standard tuple spaces with the ability of evolving the "weight" of a tuple just as it represented the concentration of a chemical substance in a biochemical system, namely, in terms of reaction and diffusion rules that adaptively apply to tuples modulo semantic match. We show that this model can be used to enact self-* properties in pervasive systems, through typical spatial patterns involving computational fields, paths, and segregation. © 2010 IEEE
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