1,721,102 research outputs found
il progetto PENCIL come ricerca-azione per costruire linee guida per l’insegnamento delle scienze nei contesti formali e informali
No full textQuesto volume raccoglie gli interventi presentati al VI Convegno Nazionale sulla Comunicazione della Scienza (Forlì, 29 novembre – 1° dicembre 2007), con una sessione speciale dedicata alla Società della Conoscenza. Gli interventi spaziano dal teatro scientifico alle nanotecnologie, dal blogging ai festival della scienza, dalla robotica alle esperienze partecipative, dalla didattica alle questioni di genere. Una messe di informazioni e stimoli intellettuali ricca, anzi, ricchissima. Così abbondante da dimostrare, una volta di più, come anche in Italia la comunità di chi si dedica alla diffusione e alla condivisione del sapere scientifico sia molto più grande – e le attività in cui essa è coinvolta molto più numerose – di quanto spesso si immagini. Una ricchezza che da un lato rende ancora più evidente l’unicità e l’importanza di questi convegni nati dalla collaborazione fra la SISSA di Trieste e l’Associazione Nuova Civiltà delle Macchine di Forlì. Ma che, allo stesso tempo, impone a chi si occupa per mestiere di scienza, comunicazione e politica della ricerca di elaborare risposte capaci di soddisfare la richiesta di riconoscimento di questa comunità emergente e cogliere le sfide poste dalla società della conoscenza
Why Adopt Codes of Good Governance? A Comparison of Institutional and Efficiency Perspectives
No full textResearch Question/Issue: Given the global diffusion and the relevance of codes of good governance, the aim of this article is to investigate if the main reason behind their proliferation in civil law countries is: (i) the determination to improve the efficiency of the national governance system; or (ii) the will to “legitimize” domestic companies in the global financial market without radically improving the governance practices. Research Findings/Insights: We collected corporate governance codes developed worldwide at the end of 2005, and classified them according to the country's legal system (common or civil law). Then, we made a comparative analysis of the scope, coverage, and strictness of recommendations of the codes. We tested differences between common law and civil law countries using t-tests and probit models. Our findings suggest that the issuance of codes in civil law countries be prompted more by legitimation reasons than by the determination to improve the governance practices of national companies. Theoretical/Academic Implications: The study contributes to enriching our knowledge on the process of reinvention characterizing the diffusion of new practices. Our results are consistent with a symbolic perspective on corporate governance, and support the view that diffusing practices are usually modified or “reinvented” by adopters. Practitioner/Policy Implications: Our results support the idea that the characteristics of the national corporate governance system and law explain the main differences among the coverage of codes. This conclusion indicates the existence of a strong interplay between hard and soft law
Routing in cognitive radio networks: Challenges and solutions
No full textCognitive radio networks (CRNs) are composed of cognitive, spectrum-agile devices capable of changing their configurations on the fly based on the spectral environment. This capability opens up the possibility of designing flexible and dynamic spectrum access strategies with the purpose of opportunistically reusing portions of the spectrum temporarily vacated by licensed primary users. On the other hand, the flexibility in the spectrum access phase comes with an increased complexity in the design of communication protocols at different layers. This work focuses on the problem of designing effective routing solutions for multi-hop CRNs, which is a focal issue to fully unleash the potentials of the cognitive networking paradigm. We provide an extensive overview of the research in the field of routing for CRNs, clearly differentiating two main categories: approaches based on a full spectrum knowledge, and approaches that consider only local spectrum knowledge obtained via distributed procedures and protocols. In each category we describe and comment on proposed design methodologies, routing metrics and practical implementation issues. Finally, possible future research directions are also proposed
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
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