171,188 research outputs found
Spatial Complex Network Analysis and Accessibility Indicators: the Case of Municipal Commuting in Sardinia, Italy
Get PDFIn this paper a contribution is presented with respect to accessibility indicators modelling for commuters moving through the municipalities of Sardinia, in Italy. In this case, spatial complex network analysis is integrated into the construction of accessibility measures: one of the most relevant outcomes of the first tool –the detection of shortest road paths and distances- is adopted as an input for the second in modelling accessibility indicators. Instead of Euclidean distances often adopted in the literature, shortest road distances are chosen, as commuting implies movements that are usually repeated daily and very likely subjected, even unconsciously, to space and time minimization strategies.
In particular, two commuter accessibility indicators are constructed according to approaches based on a travel cost and a spatial interaction model with impedance function calibrated in exponential and in power form. The accessibility indicators are confronted each other and with relevant socio-economic and infrastructure characteristics of Sardinia.
In addition, they are described, with respect to their spatial distribution and their different implications, when adopted in decision-making and planning. The travel cost based accessibility indicator has a municipal spatial distribution strongly influenced by the main road infrastructure of the Island. By contrast, spatial interaction model based accessibility indicators are more reliable, with respect to their capacity to confirm a leading socio-economic role of the municipalities comprehended in the metropolitan area of the capital town Cagliari
Elogio della poesia. Versi e saggi di Olga Sedakova. Traduzione e commento di Francesca Chessa
No full textI saggi, discorsi e versi di Olga Sedakova, selezionati in questo volume, offrono uno spaccato della Russia nel periodo sovietico tra il 1980 e il 1990. In questi scritti emerge sempre la poetessa che ne attende la fine e ne avverte prossimo il crollo. “Per Olga Sedakova, e con lei i poeti e gli artisti del disgelo chrušceviano, alla fine degli anni Sessanta essere contemporanei significò essere inattuali: esclusi dai circuiti ufficiali fin quasi alla perestrojka, esiliati nel loro proprio paese, scoprivano di avere insospettati compagni d’esilio nei grandi lirici russi del secolo d’argento e di essere contemporanei della tradizione lirica europea.” (Adalberto Mainardi). Il volume contiene un saggio autobiografico, una introduzione al suo Elogio della poesia. Inoltre tra i cicli poetici preferiti, il Viaggio in Cina e alcuni Saggi su Dante. Nella lettura di tre Canti dell’Inferno (c. XII-XIII-XIV), secondo Olga Sedakova, Dante ci presenta allegoricamente il sistema politico del suo tempo perché fosse possibile riconoscere i tiranni del nostro tempo, e di ogni tempo, prefigurati dai terribili assassini di quel cerchio. Ha scritto di lei la slavista americana Stephanie Sandler: “Esiste un poeta al mondo che in qualsiasi lingua raggiunga un equilibrio così perfetto tra la conoscenza profonda della tradizione e il coraggio nell'invenzione di una parola nuova? Olga Sedakova, in questo, non ha pari.”. Olga Sedakova (1949): oltre che poetessa moscovita, è docente alla Facoltà di Filosofia dell'Università Statale di Mosca “Lomonosov”, e membro dell’Accademia delle Scienze di Mosca. Attualmente in Italia collabora con l’Università Cattolica di Milano, con la Biblioteca Ambrosiana e con la Fondazione Russia Cristiana. Dal 2007, è Visiting professor nell’Università degli Studi di Sassari, a più riprese. Comunque, come premiatissima poetessa e come docente di grande erudizione, si ricollega alla eredità ed alla tradizione del pensiero russo, soprattutto quello del XX secolo in una sintesi letteraria e filosofica di vasto respiro.In Praise of Poetry, the autobiographical title essay here, is a wonderful introduction to Olga Sedakova the Russian poet, writer and witness to the decline, fall and aftermath of the Soviet period. Journey to a distant and enduringly noble place with her poem Chinese Journey. Experience the Power of Happiness. Accept a wonderful companion as you read Dante's Inferno XII-XIII-XIV. Visit Venice in memory of Brodsky. See an Elegy turn into a Requiem. Feel fortunate to have such a poet among us
Spatial Correlations in Attribute Communities
No full textCommunity detection is an important tool for exploring and classifying the properties of large complex networks and should be of great help for spatial networks. Indeed, in addition to their location, nodes in spatial networks can have attributes such as the language for individuals, or any other socio-economical feature that we would like to identify in communities. We discuss in this paper a crucial aspect which was not considered in previous studies which is the possible existence of correlations between space and attributes. Introducing a simple toy model in which both space and node attributes are considered, we discuss the effect of space-attribute correlations on the results of various community detection methods proposed for spatial networks in this paper and in previous studies. When space is irrelevant, our model is equivalent to the stochastic block model which has been shown to display a detectability-non detectability transition. In the regime where space dominates the link formation process, most methods can fail to recover the communities, an effect which is particularly marked when space-attributes correlations are strong. In this latter case, community detection methods which remove the spatial component of the network can miss a large part of the community structure and can lead to incorrect results
M. Piane, C. Savio, A. Altigeri, R. Pusateri, F.Ferrari, N. Pasquale, M.T. Contestabile, L. Chessa
No full textLa coroideremia (CHM; MIM 303100) è una malattia a trasmissione X-linked recessiva, caratterizzata da
degenerazione progressiva della coroide, dell’epitelio retinico pigmentato e della retina nervosa.
Generalmente i maschi affetti sviluppano durante l'adolescenza cecità notturna seguita da progressiva
perdita della visione periferica nella seconda e terza decade di vita e restringimento progressivo del campo
visivo, che può portare negli anni a cecità totale. Le femmine portatrici generalmente presentano alterazioni
pigmentarie circoscritte a livello della periferia retinica, ma non danno visivo evidente . Il gene mutato in
questa patologia è CHM, localizzato in Xq21.2 e costituito da 15 esoni; codifica per REP-1 (Rab escort protein
1), una delle proteine coinvolte nelle modificazioni post-traduzionali delle proteine Rab, che regolano il
traffico intracellulare tra i vari compartimenti vescicolari della cellula. Le mutazioni finora descritte causano
l’assenza o la perdita di funzione di REP-1. Abbiamo identificato in unpaziente italiano con coroideremia una
nuova mutazione del gene
CHM, c.819+2T>A, che determina l’eliminazione dell’esone 6 durante il processo di maturazione dell’RNA
messaggero,. L’analisi di segregazione della mutazione nella famiglia ha permesso di identificare lo stato di
portatrice della madre e della sorella e di confermare il sospetto diagnostico di coroideremia in altri tre
familiari
Medusa
Get PDFMedusa / Arturo Graf. - 3. ed. accresciuta di un terzo libro adorna di circa 100 disegni di C. Chessa. - Torino : Loescher, 1890. - 292 p. : ill. ; 20 cm
Fault-Diagnosis of Grid Structures
No full textTheprobl] offaul diagnosis in grid-connected systems is considered. A diagnosisalnosisFI caln DAGS and based on the PMCmodel is presented. DAGS provides a diagnosis which is shown to be correct, alrect, possibl incomplB[I if thecardinalq; of theactual faul set isbelB a bound T # , dependent of theactual syndrome #. A bound T independent of # is alF derived by a worst-caseanalt-c covering the cases oftriangul;; square,hexagonal and octagonal grids. T is shown to be #(n ), where n is the size of the system, for al the grids considered. c 2002El2FB#I Science B.V.Al rights reserved. Keywords: FauleDFBVU#IFqV Faul diagnosis;System-l;FV diagnosis;Paralos architectures 1. I363S-222 Faul diagnosis is of primary importance to provide highdependabilBk incomplE systems. It aims at identifying the(faul] ornon-faulB] state of the units composing a system. Upon identi#cation,fault units may be eitherreplrF; orisolEIB from the rest of the system, andfaul recovery or recon#guration techniques may be used to restore a coherent state,alte,FB the system to resume operation,possibl with reduced performance (graceful degradation). System-l-T( diagnosis was introduced by Preparata et al [14] and has beendeepl investigated in lBI#]VFqBE It aims at diagnosing systems composed by units(usualE processors), with the requirement that they are abl to test each other by exchanging information through point-to-pointbi-directional li-di A system is represented by the system graph G=(N; L), an undirected graph where node set N represents units and # Corresponding author. Instituto diElB;;BFq;E] del;;BFq;E]BFl; del CNR, Via S. Maria 46, 56126, Pisa,ItalB E-mail address: [email protected] (S. Chessa). 0304-3975/02/$ - see front matter c 2002El2FVVU Science B.V.Al rights reserved. PII: S0304-3975(..
A preliminary examination of the psychometric properties of the Separation Anxiety Symptom Inventory in Italian children.
No full textThe aim of this study was to explore the reliability and validity of a modified version of the Separation Anxiety Symptom Inventory suitable for children (SASI-C) (SASI; Silove, Manicavasagar, O’Connell, Blaszczynski, Wagner, & Henry, 1993). The SASI-C was administered to a community sample of 289 Italian children, aged 6-10 years. An exploratory factor analysis yielded two interpretable factors. The internal consistency of the SASI-C and the two factors were adequate. Correlation between the SASI-C and the Italian Fear Survey Schedule for Children (FSSC-IT, Di Riso, Salcuni, Chessa, & Lis, 2010) was calculated to assess validity
A preliminary examination of the psychometric properties of the Separation Anxiety Symptom Inventory in Italian children.
No full textThe aim of this study was to explore the reliability and validity of a modified version of the Separation Anxiety Symptom Inventory suitable for children (SASI-C) (SASI; Silove, Manicavasagar, O’Connell, Blaszczynski, Wagner, & Henry, 1993). The SASI-C was administered to a community sample of 289 Italian children, aged 6-10 years. An exploratory factor analysis yielded two interpretable factors. The internal consistency of the SASI-C and the two factors were adequate. Correlation between the SASI-C and the Italian Fear Survey Schedule for Children (FSSC-IT, Di Riso, Salcuni, Chessa, & Lis, 2010) was calculated to assess validity
Erratum: Update on psychological functioning in adults with congenital heart disease: A systematic review (Expert Review of Cardiovascular Therapy (2013) 11(6) (785–791) (10.1586/erc.13.9))
No full textThe correct author affiliations are given below: Edward Callus*1, Emilia Quadri1, Cristian Ricci2, Cristiana Passerini1, Anna Tovo1, Gabriele Pelissero3 and Massimo Chessa11IRCCS Policlinico San Donato, Pediatric and Adult Congenital Heart Centre, Italy 2Fondazione Don C. Gnocchi, Italy 3IRCCS Policlinico San Donato, Scientific Directorate, Italy *Author for correspondence: Tel.: +39 02 527 747 07 [email protected]. © 2013, Informa UK, Ltd. All rights reserved
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