Search results for "aria"

Regional differences in Italian students' performance: a simulation model

2017

This work presents the first results of a research project seeking to build a simulation model able to reproduce the differences of Italian students’ performance at regional level. A preliminary qualitative cause-and-effect model defines the main variable involved in the inter-generational skill formation processes, as well as their interplay with the job market context and the triggering of motivational forces for new skill acquisition. Such model was designed according to a system dynamics perspective, considered suitable for capturing the interrelatedness of key variables and for providing useful simulation tools to conduct and communicate future scenario analyses.     Keywords: regional…

Assessing the Reduction Strategies of the Italian Measles Outbreaks through Dynamic Performance Management (DPM) approach

Gouvernement d'entreprise et comptabilité

1999

L'objectif de cet article est d'une part, de mettre en évidence les limites de l'approche actionnariale du gouvernement des entreprises pour appréhender le rôle de la comptabilité, d'autre part, de montrer l'intérêt d'une approche partenariale comme réponse aux limites de l'approche actionnariale.

A variational inequality approach to constrained control problems

1986

Sífilis secundaria en un paciente VIH positivo

2004

La incidencia de afecciones orales, antes infrecuentes en pacientes infectados por VIH, se está incrementando y es posible que se subestime. Las lesiones orales resultantes de la sífilis secundaria son raras; sin embargo, ocurren, y el odontólogo debería ser capaz de realizar un correcto diagnóstico. En algunos casos la anámnesis y los signos clínicos de las lesiones son insuficientes para permitir el diagnóstico de la enfermedad. El conocimiento de sus características histológicas y las pruebas de laboratorio relevantes, así como su aplicabilidad y limitaciones son necesarios para el correcto diagnóstico de la sífilis secundaria. The incidence of oral manifestations of HIV infection is cha…

How many longitudinal covariate measurements are needed for risk prediction?

2014

Abstract Objective In epidemiologic follow-up studies, many key covariates, such as smoking, use of medication, blood pressure, and cholesterol, are time varying. Because of practical and financial limitations, time-varying covariates cannot be measured continuously, but only at certain prespecified time points. We study how the number of these longitudinal measurements can be chosen cost-efficiently by evaluating the usefulness of the measurements for risk prediction. Study Design and Setting The usefulness is addressed by measuring the improvement in model discrimination between models using different amounts of longitudinal information. We use simulated follow-up data and the data from t…

Investigating serendipity in recommender systems based on real user feedback

2018

Over the past several years, research in recommender systems has emphasized the importance of serendipity, but there is still no consensus on the definition of this concept and whether serendipitous items should be recommended is still not a well-addressed question. According to the most common definition, serendipity consists of three components: relevance, novelty and unexpectedness, where each component has multiple variations. In this paper, we looked at eight different definitions of serendipity and asked users how they perceived them in the context of movie recommendations. We surveyed 475 users of the movie recommender system, MovieLens regarding 2146 movies in total and compared tho…

A New Augmented Lagrangian Approach for $L^1$-mean Curvature Image Denoising

2015

Variational methods are commonly used to solve noise removal problems. In this paper, we present an augmented Lagrangian-based approach that uses a discrete form of the L1-norm of the mean curvature of the graph of the image as a regularizer, discretization being achieved via a finite element method. When a particular alternating direction method of multipliers is applied to the solution of the resulting saddle-point problem, this solution reduces to an iterative sequential solution of four subproblems. These subproblems are solved using Newton’s method, the conjugate gradient method, and a partial solution variant of the cyclic reduction method. The approach considered here differs from ex…

Sensory modalities and mental content in product experience

2015

Contemporary research in human-technology interaction emphasises the need to focus on what people experience when they interact with technological artefacts. Understanding how people experience products requires detailed investigation of how physical design properties are mentally represented, and the theorisation of how people represent information obtained through different modalities still needs work. The objective of this study is to investigate how people experience modality-related affective aspects of products, using the psychological concept of mental content. For this purpose, we adopt the framework of user psychology, which is the sub-area of psychology involved with investigating…

Assessing game experience: Heart rate variability, in-game behavior and self-report measures

2014

Assessing game experience by means of recordings of physiological reactions elicited during game play is a technique that has gained popularity in recent years in the field of digital games research. However, since physiological signals are typically linked to several psychological processes, the use of some measures such as cardiac activity or heart rate (HR) remains problematic. The goal of the present study is to investigate to what extent game logs and self-report measures of game experience have a predictive value for heart rate variability during game play. Our results showed that the accurate registration of in-game behaviors by means of game logs carries the potential of providing r…