Search results for "Valence"
showing 10 items of 2732 documents
About Combining Metric Learning and Prototype Generation
2014
Distance metric learning has been a major research topic in recent times. Usually, the problem is formulated as finding a Mahalanobis-like metric matrix that satisfies a set of constraints as much as possible. Different ways to introduce these constraints and to effectively formulate and solve the optimization problem have been proposed. In this work, we start with one of these formulations that leads to a convex optimization problem and generalize it in order to increase the efficiency by appropriately selecting the set of constraints. Moreover, the original criterion is expressed in terms of a reduced set of representatives that is learnt together with the metric. This leads to further im…
Size–Abundance Relationships of Freshwater Macroinvertebrates in Two Contrasting Floodplain Channels of Rhone River
2022
Body size is perhaps the most fundamental property of an organism and its relationship with abundance is one of the most studied relationships in ecology. Although numerous studies have examined these relationships in local communities, few have investigated how they vary at different temporal and spatial scales. We investigated the relationship between body size and abundance of local macroinvertebrate communities in two floodplain channels of the French upper Rhone River. The two channels differ in their vegetation coverage (high vs. low vegetation) and hydrological regimes. The shapes of the size–abundance relationship were similar between channels on a yearly basis but differed wh…
Color and Timbre Gestures: An Approach with Bicategories and Bigroupoids
2022
White light can be decomposed into different colors, and a complex sound wave can be decomposed into its partials. While the physics behind transverse and longitudinal waves is quite different and several theories have been developed to investigate the complexity of colors and timbres, we can try to model their structural similarities through the language of categories. Then, we consider color mixing and color transition in painting, comparing them with timbre superposition and timbre morphing in orchestration and computer music in light of bicategories and bigroupoids. Colors and timbres can be a probe to investigate some relevant aspects of visual and auditory perception jointly with thei…
Il potere della parola. Gli Inferni di Anton Francesco Doni
2022
Ad alimentare gli Inferni, edito da Anton Francesco Doni nel 1553, è la coscienza infelice della condizione umana e il desiderio di rivalsa dalle ingiustizie patite. Evidente, dunque, è l’intento polemico dell’opera, rappresentazione trasfigurata dei vizi terreni e ‘prefigurazione’ dei castighi riservati a chi ha smarrito un’etica del vivere. Ma a connotare gli Inferni è altresì la sua natura duplice e contraddittoria, evidente nell’immagine della ruota del supplizio eterno: pur veicolando immagini di fiera crudeltà, questo simbolo ambivalente rivela la sua affinità col cerchio, emblema di perfezione, nell’oscillazione fra mondo del divenire e dell’eterno ritorno e nel moto che ora eleva, o…
Measurement invariance of the nine-item Internet Gaming Disorder Scale (IGDS9-SF) across Albania, USA, UK, and Italy
2018
The IGDS9-SF, which assesses Internet Gaming Disorder behaviors, has been validated in a number of countries (Portugal, Italy, Iran, Slovenia), although the psychometric equivalence of the instrument has been assessed only across Australia, the USA, the UK, and India. This research aimed at providing further cross-cultural insights into IGD by assessing the factorial structure of the IGDS9-SF in Albania and investigating its measurement invariance across Albanian, Italian, American, and British gamers. Multi-Group Confirmatory Factor Analyses were performed on a sample of 1411 participants from Albania (n = 228), USA (n = 237), the UK (n = 275), and Italy (n = 671). The CFAs confirmed the s…
Measuring dispositional optimism in patients with chronic heart failure and their healthcare providers: The validity of the Life Orientation Test-Rev…
2017
Patrizia Steca,1 Dario Monzani,1 Antonia Pierobon,2 Giulia Avvenuti,2 Andrea Greco,1 Anna Giardini2 1Department of Psychology, University of Milano – Bicocca, Milan, 2Psychology Unit, Istituti Clinici Scientifici Maugeri Spa SB, IRCCS Montescano, Montescano, Italy Abstract: The Life Orientation Test-Revised (LOT-R) measures dispositional optimism (DO) – an individual difference promoting physical and psychological well-being in healthy adults (HAs) as well as in patients with chronic heart failure (CHF) and healthcare providers (HPs). Controversy has arisen regarding the dimensionality of the LOT-R. Whereas DO was originally defined as a one-dimensional construct, empiri…
A NOTE ON THE CATEGORICAL NOTIONS OF NORMAL SUBOBJECT AND OF EQUIVALENCE CLASS
2021
In a non-pointed category E, a subobject which is normal to an equivalence relation is not necessarily an equivalence class. We elaborate this categorical distinction, with a special attention to the Mal'tsev context. Moreover, we introduce the notion of fibrant equipment, and we use it to establish some conditions ensuring the uniqueness of an equivalence relation to which a given subobject is normal, and to give a description of such a relation.
Coherent Conditional Previsions and Proper Scoring Rules
2012
In this paper we study the relationship between the notion of coherence for conditional prevision assessments on a family of finite conditional random quantities and the notion of admissibility with respect to bounded strictly proper scoring rules. Our work extends recent results given by the last two authors of this paper on the equivalence between coherence and admissibility for conditional probability assessments. In order to prove that admissibility implies coherence a key role is played by the notion of Bregman divergence.
Seroprevalence of Norovirus Genogroup IV Antibodies among Humans, Italy, 2010–2011
2014
Antibodies specific to genogroup IV identified in human specimens suggest zoonotic exposure.
Nationwide surveillance study of human astrovirus infections in an Italian paediatric population
2012
SUMMARYThe study investigated the genetic diversity of human astroviruses (HAstVs) detected in children hospitalized with gastroenteritis in Italy in 2008–2009. A total of 1321 faecal samples were collected in Parma (northern Italy), Bari (southern Italy), and Palermo (Sicily) and screened for the presence of HAstVs. RT–PCR amplification of a portion at the 5′-end of ORF2 allowed the detection of HAstVs in 3·95% of the patients. Four different genotypes (HAstV-1, HAstV-2, HAstV-4, HAstV-5) were found to be circulating during the study period, with HAstV-1 being the predominant type. Interestingly, a novel lineage, proposed as HAstV-2d, was found to have emerged in Parma in 2009. Investigati…