1,721,262 research outputs found
Automatic signature verification in the mobile cloud scenario: survey and way ahead
Full text linkOn-line signature verification is typically carried out with the use of digitizing tablets specifically designed for the aim. So far, stand-alone systems have been mainly inspected, but the current distributed/cloud scenario and the amount of mobile devices in everyday life is calling for a new challenge. Within this scenario, signatures are acquired around the world with different kinds of devices and processed on multiple platforms in order to be veri-fied. Through the paper, the different phases of the signature ver-ification process in the new scenario are presented and the most valuable results are discussed considering the following aspects: accessibility and usability, interoperability, security and perfor-mance. Achievements as well as weakness are focused to high-light promising directions for further research and technology development
Item Response Theory for Optimal Questionnaire Design
No full textStudent assessment is one of the most critical aspects related to web-based
learning systems. In this field, the use of on-line questionnaires - based on
multiple-choice items - is one of the most widespread approaches.
This paper presents a new technique for automatic design of optimal questionnaires that uses a Genetic Algorithm for multiple-choice item
selection, according to the Item Response Theory.
The experimental results, carried out on both simulated and genuine data, confirm the effectiveness of the new approach, that is able to adapt questionnaire design to the abilities of a given set of students
Open data e digitalizzazione della PA: L’Italia si caratterizza ancora dall’assenza di una visione politica chiara e lungimirante
No full textIn Italia, il processo di digitalizzazione della PA si è finora contraddistinto per la sostanziale e cronica distanza esistente tra proclami e risultati concreti, manifestazioni di interesse e attuazione di progettualità efficaci. Il risultato è quello di una digitalizzazione narrata ed evocata continuamente ma mai concretamente realizzata, spesso lontana dalle esigenze dei cittadini e delle imprese, quando non addirittura ostile.
Alla base di questa situazione vi è certamente la complessiva mancanza di una visione politica chiara e lungimirante per lo sviluppo del digitale che, ancora oggi, viene considerato come un asset marginale rispetto ad altri domini. Manca infatti ancora la consapevolezza piena dell’importanza del digitale quale asset strategico trasversale per la crescita sociale ed economica del Paese
Proceeding of the XIII International Conference on Frontiers in Handwriting Recognition (ICFHR 2012)
No full textZoning Methods for Handwritten Character Recognition: A Survey
No full textThis paper presents a survey on zoning methods for handwritten character recognition. Through the analysis of the relevant literature in the field, the most valuable zoning methods are presented in terms of both topologies and membership functions. Throughout the paper, diverse zoning
topologies are presented based on both static and adaptive approaches. Concerning static
approaches, uniform and non-uniform zoning strategies are discussed. When adaptive zonings are considered, manual and automatic strategies for optimal zoning design are illustrated as well as the most appropriate zoning representation techniques. In addition, the role of membership functions for zoning-based classification is highlighted and the diverse approaches to membership
function selection are presented. Concerning global membership functions, the paper introduces
order-based approaches as well as fuzzy approaches using border-based and ranked-based
fuzzy membership values. Concerning local membership functions, the recent parameter-based approaches are described, in which the optimal membership-function is selected for each zone of
the zoning method. Finally, a comparative analysis on the performance of zoning methods is presented and the most interesting approaches are focused on in terms of topology design and
membership function selection. A list of selected references is provided as a useful tool for interested researchers working in the field
A New Class of Monotone Functions of the Residue Number System
No full textThis paper presents a new class of monotone functions that can be computed from the Residue Number System (RNS) to the integers. On the basis of these functions new implementations are proposed for residue-to-binary conversion and magnitude comparison that are superior to traditional techniques, if a modulus of the kind 2k (k integer) is included in the set of RNS moduli
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