(<Emphasis Type="Italic">CF</Emphasis>)<Superscript>2</Superscript> architecture: contextual collaborative filtering

Recommender systems have dramatically changed the way we consume content. Internet applications rely on these systems to help users navigate among the ever-increasing number of choices available. However, most current systems ignore the fact that user preferences can change according to context, resulting in recommendations that do not fit user interests. This research addresses these issues by proposing the \(({ CF})^2\) architecture, which uses local learning techniques to embed contextual awareness into collaborative filtering models. The proposed architecture is demonstrated on two large-scale case studies involving over 130 million and over 7 million unique samples, respectively. Results show that contextual models trained with a small fraction of the data provided similar accuracy to collaborative filtering models trained with the complete dataset. Moreover, the impact of taking into account context in real-world datasets has been demonstrated by higher accuracy of context-based models in comparison to random selection models.     

New Insights on Picasso’s Blue Period Painting La famille Soler

The study of La Famille Soler using non-invasive imaging, molecular, structural, and elemental analysis allowed the re-examination of changes of the work. Considered as the earliest of Picasso’s versions of Le déjeuner sur l’herbe by E. Manet, evidence suggests that an underlying landscape painted by Vidal in 1903 also referred to Manet’s masterpiece. On the other hand, new results suggest that the cubist sketch undertaken by Picasso in 1912, prior to the current blue background, could be an uncompleted transformation of Vidal’s landscape into synthetic cubism. Through study the main pigments used in the underlying compositions were successfully identified.     

Hyperlocal News Coverage: A Population Ecology Perspective

Adopting a population ecology perspective, this study tests the influence of population-level factors on news coverage in hyperlocal websites. Specifically, level of legitimacy of the hyperlocal website population is assessed as a predictor of frequency and favorability of coverage of local businesses and government organizations. Traditional “field-level” predictors from media sociology are also examined. Among the field-level factors tested, professional background of staff and affiliation with traditional media organizations proved most important in explaining favorability of coverage, and level of advertising was an important predictor of frequency of coverage. The level of the population’s legitimacy also corresponded significantly with frequency of coverage. Results suggest that factors related to the population level and to institutionalization over time are relevant, even for the hyperlocal website, a relatively young and idiosyncratic media form. These factors warrant attention in future research.     

Family resources and parenting quality: links to children's cognitive development across the first 3 years

Reciprocal associations among measures of family resources, parenting quality, and child cognitive performance were investigated in an ethnically diverse, low-income sample of 2,089 children and families. Family resources and parenting quality uniquely contributed to children's cognitive performance at 14, 24, and 36 months, and parenting quality mediated the effects of family resources on children's performance at all ages. Parenting quality continued to relate to children's cognitive performance at 24 and 36 months after controlling for earlier measures of parenting quality, family resources, and child performance. Similarly, children's early cognitive performance related to later parenting quality above other measures in the model. Findings merge economic and developmental theories by highlighting reciprocal influences among children's performance, parenting, and family resources over time.