Search results for " N.I.H."
showing 10 items of 161 documents
Mutual nonlinear prediction as a tool to evaluate coupling strength and directionality in bivariate time series: Comparison among different strategie…
2008
We compare the different existing strategies of mutual nonlinear prediction regarding their ability to assess the coupling strength and directionality of the interactions in bivariate time series. Under the common framework of $k$-nearest neighbor local linear prediction, we test three approaches based on cross prediction, mixed prediction, and predictability improvement. The measures of interdependence provided by these approaches are first evaluated on short realizations of bivariate time series generated by coupled Henon models, investigating also the effects of noise. The usefulness of the three mutual nonlinear prediction schemes is then assessed in a common physiological application d…
Quantifying the complexity of short-term heart period variability through K nearest neighbor local linear prediction
2008
The complexity of short-term heart period (HP) variability was quantified exploiting the paradigm that associates the degree of unpredictability of a time series to its dynamical complexity. Complexity was assessed through k-nearest neighbor local linear prediction. A proper selection of the parameter k allowed us to perform either linear or nonlinear prediction, and the comparison of the two approaches to infer the presence of nonlinear dynamics. The method was validated on simulations reproducing linear and nonlinear time series with varying levels of predictability. It was then applied to HP variability series measured from healthy subjects during head-up tilt test, showing that short-te…
Palermo, quartieri e periferie: “azioni guida” nel palinsesto urbano
2012
The method of choice for the local coordination work led by the Palermo unit interpreted the common requests for the National PRIN on “the upgrading and rehabilitation of the public housing sector”, focusing its attention on the multiple scenarios and using the architectural project as a powerful “working tool”. From the project examination on the specific cases and the theories put forward by the group of designers – considering the different design approaches – it seems possible to extrapolate some recurring actions – on the basis of the results achieved – which might be considered as a reference structure for the definition of those “guidelines” representing the final target of the resea…
La città di Alphabet. Architettura per prosumers.
2021
Attraverso alcuni aspetti salienti dell’ideazione, della produzione e dell’opposizione al progetto del Toronto Quayside di Sidewalk labs, l’articolo discute l’influenza delle infrastrutture digitali per l’informazione sul progetto della casa e del quartiere. L’ampliamento delle attività svolte da remoto nello spazio domestico, enfatizzato dal quotidiano della pandemia da Covid 19, costituisce per gli oligopolisti planetari degli urban data come Alphabet un utile volano pubblicitario e un acceleratore. La fusione dei nuovi vessilli della tecnoemancipazione e della sostenibilità in ipotesi sperimentali che mirano a costruirsi sia per intero che per parti realizza un nuovo orizzonte in cui lo …
Ambiti identitari di quartiere per la città del futuro
2013
How should we conceive a future city that is capable of avoiding the mistakes of the present? In order to redraw our urban spaces we have been looking for neighbourhood identity areas in Palermo, so that they can link the past to the future, development to conservation. The neighbourhood becomes the common ground between the private sphere (the house) and the public sphere (the city), and allows the citizens to embrace the active sphere of politics. This paper aims at identifying a way to overcome the administrative scheme which has so far been used: neighbourhoods urge citizens from the 21th century to rediscover society, conceived as the connecting ground between each other.
Vivibilità e creatività delle periferie
2020
Consumare meno suolo significa riscoprire la vita in città, riqualificando ambiti degradati, consolidando le piccole centralità mediante spazi pubblici e funzioni aggreganti, sostenendo e incentivando la “ricucitura” di architetture dismesse e parti di città poco vivibili. La “memoria” identitaria e la dimensione ecologico-paesaggistica in chiave creativa delle città possono, e devono, divenire un volano per innescare vivibilità soprattutto nei contesti urbani difficili. Partendo dal concetto di milieu, un approccio creativo bottom up può costituire la base operativa per una vision che, ancor prima di avere una dimensione urbana, ne abbia una “umana”. Nell’obiettivo ultimo di affrontare tem…
Exploiting Correlation between Body Gestures and Spoken Sentences for Real-time Emotion Recognition
2017
Humans communicate their affective states through different media, both verbal and non-verbal, often used at the same time. The knowledge of the emotional state plays a key role to provide personalized and context-related information and services. This is the main reason why several algorithms have been proposed in the last few years for the automatic emotion recognition. In this work we exploit the correlation between one's affective state and the simultaneous body expressions in terms of speech and gestures. Here we propose a system for real-time emotion recognition from gestures. In a first step, the system builds a trusted dataset of association pairs (motion data -> emotion pattern), a…
Community Development and Social Participation
2011
The paper presents the reslt of the action research project issued in Palermo (Southern Italy), in disadvantaged urban suburbs, methodologically based on Kurt Lewin's field theory - that is a three-step spiral process of planning which involves recoinnaissance; talking actions; and fact-finding about the results of the action - in order to develop the social participation and the social change. The principal aim of the project was the empowerment of participants, obtaining their collaboration through participation, giving them acquisition of knowledge for a real social change.
An Online Metric Learning Approach through Margin Maximization
2011
This work introduces a method based on learning similarity measures between pairs of objects in any representation space that allows to develop convenient recognition algorithms. The problem is formulated through margin maximization over distance values so that it can discriminate between similar (intra-class) and dissimilar (inter-class) elements without enforcing positive definiteness of the metric matrix as in most competing approaches. A passive-aggressive approach has been adopted to carry out the corresponding optimization procedure. The proposed approach has been empirically compared to state of the art metric learning on several publicly available databases showing its potential bot…
Optimisation des requêtes de similarité dans les espaces métriques répondant aux besoins des usagers
2012
The complexity of data stored in large databases has increased at very fast paces. Hence, operations more elaborated than traditional queries are essential in order to extract all required information from the database. Therefore, the interest of the database community in similarity search has increased significantly. Two of the well-known types of similarity search are the Range (Rq) and the k-Nearest Neighbor (kNNq) queries, which, as any of the traditional ones, can be sped up by indexing structures of the Database Management System (DBMS). Another way of speeding up queries is to perform query optimization. In this process, metrics about data are collected and employed to adjust the par…