1,721,066 research outputs found
Territorial Information System interoperability: a design improving interaction in an emergency
No full textRisk analysis and emergency management use common instruments such as GIS (Geographic Information Systems) and TIS (Territorial Information Systems). They do not visualize maps alone, but they can be instruments of interaction among many components and actors (data, operators...). Interoperability represents the next fundamental step towards developing more efficient management systems. We can discriminate three levels: data interoperability, applications or software tools interoperability and finally systems interoperability. Software technological development is carried out in many frameworks such as CORBA (Common Object Request Broker Architecture) [8, 10], COM (Component Object Model) [2], JAVA [9, 11], .NET [2], etc. Each of them has resolved interoperability with different results. In any case, we built efficient architectures by using the present frameworks. Our paper aims to describe the interoperability aspects and to show some practical achievements. These allow effective monitoring in the presence of concurrent activities and detection. In particular, we will present two architectures adopted for defence risk (air-space control) and in the activities of the fire-brigade department
Privacy-Aware Data-Intensive Applications
No full textThe rise of Big Data is leading to an increasing demand for data-intensive applications (DIAs), which, in many cases, are expected to process massive amounts of sensitive data. In this context, ensuring data privacy becomes paramount. While the way we design and develop DIAs has radically changed over the last few years in order to deal with Big Data, there has been relatively little effort to make such design privacy-aware. As a result, enforcing privacy policies in large-scale data processing is currently an open research problem. This thesis proposal makes one step towards this investigation: after identifying the dataflow model as the reference computational model for largescale DIAs, (1) we propose a novel language for specifying privacy policies on dataflow applications along with (2) a dataflow rewriting mechanism to enforce such policies during DIA execution. Although a systematic evaluation still needs to be carried out, preliminary results are promising. We plan to implement our approach within a model-driven solution to ultimately simplify the design and development of privacy-aware DIAs, i.e. DIAs that ensure privacy policies at runtime
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
Tecniche di interoperabilità di dati e applicazioni nei sistemi distribuiti GIS
No full textL’interoperabilità è spesso erroneamente associata e limitata ad una trasparenza dei dati fra differenti sistemi. In realtà l’interoperabilità va distinta a livello di dati, a livello di applicazioni e strumenti software e infine a livello di interoperabilità fra sistemi. Utilizzando le tecnologie software, che nel corso degli anni sono state sviluppate (CORBA (SUN, 2004) (Chang et al, 2003), COM (Troelsen, 2002), JAVA (Sharma et al., 2003) (Rist, Aubrey, 2003), .NET (Troelsen, 2002)), abbiamo risolto le esigenze di interoperabilità tra applicazioni remote, operanti su sistemi che sono distribuiti sul territorio. L'articolo svilupperà gli aspetti teorici e l’implementazione di alcune architetture adottate in pratica, fra cui le tecniche di interoperabilità sviluppate per la sala di controllo dei vigili del fuoco. Verranno mostrate in particolare alcune soluzioni basate su tecnologie OLE, COM e indicate le prospettive offerte dalle tecnologie .NET- web services.L’interoperabilità è spesso erroneamente associata e limitata ad una trasparenza dei dati fra differenti sistemi. In realtà l’interoperabilità va distinta a livello di dati, a livello di applicazioni e strumenti software e infine a livello di interoperabilità fra sistemi. Utilizzando le tecnologie software, che nel corso degli anni sono state sviluppate (CORBA (SUN, 2004) (Chang et al, 2003), COM (Troelsen, 2002), JAVA (Sharma et al., 2003) (Rist, Aubrey, 2003), .NET (Troelsen, 2002)), abbiamo risolto le esigenze di interoperabilità tra applicazioni remote, operanti su sistemi che sono distribuiti sul territorio. L'articolo svilupperà gli aspetti teorici e l’implementazione di alcune architetture adottate in pratica, fra cui le tecniche di interoperabilità sviluppate per la sala di controllo dei vigili del fuoco. Verranno mostrate in particolare alcune soluzioni basate su tecnologie OLE, COM e indicate le prospettive offerte dalle tecnologie .NET- web services
Optimized Algorithms for Detection of Sparse Targets in Heterogeneous Gaussian Noise
No full textIn this paper we propose two adaptive detection algorithms for sparse targets embedded in heterogeneous AR Gaussian noise. The first one solves the problem of estimating the subset of cells containing a scatterer via the GLRT principle, while the latter models the number
of scatterers as a random parameter and relies on the use of quantized statistics. A preliminary performance assessment, conducted by Monte Carlo simulation, has shown that both solutions allow to reduce the detrimental effects, in terms of collapsing loss, suffered by conventional solutions. In particular the former algorithm is to be
preferred in terms of performance while the latter has a lower computational complexity
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
Procedura di ristrutturazione dei dati ambientali orientata alle simulazioni territoriali. Un esempio di applicazione: previsione di campo elettromagnetico in presenza di strutture urbane
No full textL’articolo descrive una nostra procedura di trasformazione dei dati delle strutture urbane, archiviati con applicativi standard di disegno tecnico (AUTOCAD), in dati essenziali, utilizzabili da programmi di simulazione caratterizzati da una elevata frequenza di interrogazione dei data base. Sono poi mostrati i risultati di un nostro programma al calcolatore, funzionante nell’ambiente informatico di gestione territoriale TERRAPACK© (Ottavi et al., 1991-1; 1991-2), per la previsione della propagazione di campo elettromagnetico (1 GHz) in presenza di tali strutture urbane.We show our method to change urban data from drawing oriented (e.g. .DXF format) to environment oriented files. Our software prediction programs use these data to include diffraction and reflection (by building and land) effects in three-dimensional analyses of electromagnetic propagation. Results of simulations are shown by using TERRAPACK© (Ottavi et al., 1991-1; 1991-2) software product that can manage a lot of environmental data
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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