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Evaluating Security, Privacy and Usability Features of QR Code Readers
No full textThe widespread of smartphones with advanced capabilities has motivated developers to design new mobile applications that are used as barcode scanners. Although several barcode readers are available, they still have security and privacy limitations. In this paper, we first present a comprehensive and systematic review of barcode reader applications by analyzing their security, privacy and usability features. We categorize these apps into four groups depending on their properties: URLs security, Crypto-based security, Popular applications, and Save-privacy. We also highlight their weaknesses and present design recommendations for usable, secure and privacy-guaranteed scanner applications. Based on our recommendations, we have developed BarSec Driod a proof-of-concept secure barcode reader Android app that exploits some features of other applications and at the same time overcomes their limitations. We have performed a user usability and security survey, on BarSec Driod and two other popular QR code readers, KasperSky and QR Droid Private. The results show that BarSec Driod is easy to use, satisfies the expectations of the users and is secure. Moreover, we have observed that following the design tips, user’s security awareness and usability increase
Calcium alkoxides for stone consolidation: Investigating the carbonation process
No full textDespite the importance of carbonation in many processes, still the reaction needs investigation. The reaction is
essential for the effectiveness of consolidants, based on CaCO3 forming products, used in stone conservation.
Research on carbonation of two calcium alkoxides products, developed during the Nanomatch project, is presented
in this paper and the results discussed and compared with those reported with the most used nanolimes.
Calcium tetrahydrofurfuryloxide (Ca(OTHF)2), dissolved in four different solvents, and calcium ethoxide (Ca
(OEt)2), diluted in ethanol, were applied on glass slides and their carbonation kinetics investigated together
with their coatings after being kept in uncontrolled and controlled RH conditions (50% and 90%). This allowed
to understand the evolution and the phases formed along the process. Carbonation follows the two pathways
already reported for alkoxides; it is a quick process and eventually leads to the formation of the most stable
crystalline phase (calcite), with high humidity favouring this final step. Alkoxides resulted thus to be suitable
compounds for stone conservation, where full carbonation and formation of calcite needs to be obtained for
the effectiveness of consolidation
Field Substitution in Surveys
No full textA possible approach to deal with nonresponse in surveys is replacing nonrespondents with other similar units during fieldwork.
Field substitution is a general term encompassing many different practices. Both conceptual and operative aspects of substitution can influence the reliability of results, such as methods of selection of substitutes (random/nonrandom), mode of data collection (telephone/face‐to‐face interviews), fieldwork protocols, and controls (loose/tight).
If substitution on a convenience basis is allowed or the decision to substitute is left to the interviewer's discretion, the sample representativeness could be undermined and a substitution bias may compound the effects of nonresponse. The risk is lower in telephone surveys, which make contact attempts less demanding and allow easier monitoring of operators' activities.
The substitution bias can be evaluated testing the hypothesis that the subsamples of originally selected units and of substitutes belong to the same population.
Field substitution can be advantageous, since it maintains the intended sample size and structure, ensuring the planned number of observations for each targeted subpopulation of the sample. It is considered especially suitable for surveys with an extensively stratified design. The choice to resort to field substitution depends on its anticipated usefulness, given the objectives, characteristics, and context of each survey
Dio mio, Dio mio perché mi hai abbandonato: Riflessione sulla sofferenza dell'uomo attraverso esperienze personali
No full textCombining LULC data and agricultural statistics for A better identification and mapping of High nature value farmland: A case study in the veneto Plain, Italy
No full textHigh Nature Value farmland (HNVf) are characterised by high naturalness of land cover and low intensity of agricultural practices. They are essential for biodiversity conservation in rural environments, and their presence is an important indicator of the effectiveness of different EU policies that aim to support biodiversity in agricultural areas. Consequently, their identification, protection and implementation is of strategic importance. Previous studies have analysed the landscape along an urban-rural-natural gradient, beginning with Land Use and Land Cover (LULC) maps. Building up from this baseline, this paper integrates spatial analysis methods with statistical data related to agricultural practices and their intensity, with the aim of mapping and assessing HNVf in a portion of the Veneto Plain, north-east Italy. In particular, this paper presents a methodology for the identification of HNVf applied to two datasets: (i) the first encompassing only LULC data and (ii) the second encompassing also statistical data on agricultural practices. The aim is to demonstrate how this additional information improves the identification of HNVf. In the first step, a Kernel Density Estimation (KDE) technique is applied to a reclassified LULC map, in order to calculate continuous intensity indicators. A Principal Components Analysis and an ISODATA Cluster Analysis are then performed respectively to remove redundant information and to identify the different landscape structures of the study area. The second analysis follows the same steps, with the difference that LULC intensity indicators are analysed in combination with data on crop rotations, irrigation and livestock from a census survey. The first analysis returns a map of the landscape driven only by different intensities of land use. The second returns a map where the statistics on agricultural practices allow for a better characterisation of the natural value of the landscape. Agricultural statistics improved the results, since they allow the discrimination of lower intensity clusters within the cultivated areas, which are traditionally excluded from HNVf by considering only the land cover. The comparison between the results of the two analyses shows that the combined use of the agricultural statistics determines a more detailed representation of the study area, that allows a better differentiation of the agricultural areas between HNVf and non-HNVf, leading to an improvement of the HNVf identification methodology. The benefit of using additional information can be therefore of interest for territorial planning, with the ultimate aim of promoting biodiversity conservation
Grading by Committees: An Axiomatic Approach
No full textWe deal the problem of aggregation of individual judgments
for a global evaluation of a candidate or a product. In our theoretically
oriented approach, aggregation operators are compared with each other
based on their mathematical properties. We show that any monotone
and strategy-proof operators is characterized by a particular collection
of decision makers
Recensione a AA.VV. "Un estratto di vita. Goliarda Sapienza fra teatro e cinema", a cura di Stefania Rimini e Maria Rizzarelli, Duetredue Edizioni 2018
No full textIntroduzione
No full textIn questo saggio introduttivo viene innanzitutto illustrata l'origine del testo introdotto (Le lezioni di psicologia filosofica di Ludwig Wittgenstein). Si tratta di un testo che contiene gli appunti presi da Peter T. Geach durante l'ultimo corso di lezioni tenuto da Wittgenstein a Cambridge nelll'anno accademico 1946-1947. Non trattandosi di un testo attribuibile direttamente a Wittgenstein, occorre utilizzarlo con molte cautele interpretative sempre confrontandolo con i testi redatti da Wittgenstein in prima persona. Si sottolinea però anche l'interesse che un simile testo può rivestire soprattutto come testimonaizna dell'insegnamento orale di Wittgenstein. Nella seconda parte del saggio si cerca di spiegare che cosa Wittgenstein intendesse per psicologia filosofica o per filoslofia della psicologia e come si debba interpretare l'idea da lui più volta ribadita secondo cui la filosofia (e, dunque, anche la filsofia della psciolgia) consiste di rierche concettuali che non devono mai essere confuse con le ipotesi e il lavoro sperimentale degli psicologi
Cogliere il timing: l'emergenza della temporalità nel metodo critico di Sergio Bettini
No full textIl IX Convegno dei Dottorandi e Dottori di Ricerca, tenutosi dal 14 al 16 giugno 2017 presso la Macroarea di Lettere e Filosofia dell'Università degli Studi di Roma Tor Vergata, ha raccolto idealmente l'eredità delle prece-denti edizioni sia nella sua formulazione che negli intenti. Ogni anno, in-fatti, un nuovo Comitato organizzatore si “mette in gioco” nell’ideazione, costruzione, realizzazione delle diverse fasi del Convegno fino a giungere alla pubblicazione degli atti che, per questa edizione, sono stati suddivisi in tre volumi, ciascuno composto di due sezioni precedute da un saggio introduttivo di un membro del Comitato