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Search Results: 1 - 10 of 1158 matches for " Elisabetta Zibetti "
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Using control heuristics as a means to explore the educational potential of robotics kits
Ilaria Gaudiello,Elisabetta Zibetti
Themes in Science and Technology Education , 2013,
Abstract: The educational potential of robotics kits as a form of control technology will remain undervalued until meaningful observation parameters are identified to enable a better understanding of children’s control strategies. For this reason, this paper aim sprimarily to identify and classify the heuristics spontaneously applied by 6-10 year old children interacting with robotic devices containing specific transparency features (i.e.programmability) and interactivity features (i.e. immediacy of feedback). Two studies are described: an exploratory investigation into the control of a Lynx AL5A arm and apilot study about the control of a Lego Mindstorms NXT . Two issues relating to control heuristics are addressed: the heuristic shift and the perceived and objective level of task difficulty. The results demonstrate that three main types of heuristic emerge: (i) procedural-oriented, (ii) declarative-oriented, and (iii) metacognitive-oriented. Limitations of the difficulty indicators used and shift patterns proposed are discussed inrelation to future research.
Trust as indicator of robot functional and social acceptance. An experimental study on user conformation to the iCub's answers
Ilaria Gaudiello,Elisabetta Zibetti,Sebastien Lefort,Mohamed Chetouani,Serena Ivaldi
Computer Science , 2015,
Abstract: To investigate the functional and social acceptance of a humanoid robot, we carried out an experimental study with 56 adult participants and the iCub robot. Trust in the robot has been considered as a main indicator of acceptance in decision-making tasks characterized by perceptual uncertainty (e.g., evaluating the weight of two objects) and socio-cognitive uncertainty (e.g., evaluating which is the most suitable item in a specific context), and measured by the participants' conformation to the iCub's answers to specific questions. In particular, we were interested in understanding whether specific (i) user-related features (i.e. desire for control), (ii) robot-related features (i.e., attitude towards social influence of robots), and (iii) context-related features (i.e., collaborative vs. competitive scenario), may influence their trust towards the iCub robot. We found that participants conformed more to the iCub's answers when their decisions were about functional issues than when they were about social issues. Moreover, the few participants conforming to the iCub's answers for social issues also conformed less for functional issues. Trust in the robot's functional savvy does not thus seem to be a pre-requisite for trust in its social savvy. Finally, desire for control, attitude towards social influence of robots and type of interaction scenario did not influence the trust in iCub. Results are discussed with relation to methodology of HRI research.
Towards engagement models that consider individual factors in HRI: on the relation of extroversion and negative attitude towards robots to gaze and speech during a human-robot assembly task
Serena Ivaldi,Sebastien Lefort,Jan Peters,Mohamed Chetouani,Joelle Provasi,Elisabetta Zibetti
Computer Science , 2015,
Abstract: Estimating the engagement is critical for human - robot interaction. Engagement measures typically rely on the dynamics of the social signals exchanged by the partners, especially speech and gaze. However, the dynamics of these signals is likely to be influenced by individual and social factors, such as personality traits, as it is well documented that they critically influence how two humans interact with each other. Here, we assess the influence of two factors, namely extroversion and negative attitude toward robots, on speech and gaze during a cooperative task, where a human must physically manipulate a robot to assemble an object. We evaluate if the scores of extroversion and negative attitude towards robots co-variate with the duration and frequency of gaze and speech cues. The experiments were carried out with the humanoid robot iCub and N=56 adult participants. We found that the more people are extrovert, the more and longer they tend to talk with the robot; and the more people have a negative attitude towards robots, the less they will look at the robot face and the more they will look at the robot hands where the assembly and the contacts occur. Our results confirm and provide evidence that the engagement models classically used in human-robot interaction should take into account attitudes and personality traits.
Introducing ADAPTSMOOTH, a new code for the adaptive smoothing of astronomical images
Stefano Zibetti
Physics , 2009,
Abstract: We introduce and publicly release a new code, ADAPTSMOOTH, which serves to smooth astronomical images in an adaptive fashion, in order to enhance the signal-to-noise ratio (S/N). The adaptive smoothing scheme allows to take full advantage of the spatially resolved photometric information contained in an image in that at any location the minimal smoothing is applied to reach the requested S/N. Support is given to match more images on the same smoothing length, such that proper estimates of local colours can be done, with a big potential impact on multi-wavelength studies of extended sources (galaxies, nebulae). Different modes to estimate local S/N are provided. In addition to classical arithmetic-mean averaging mode, the code can operate in median averaging mode, resulting in a significant enhancement of the final image quality and very accurate flux conservation. To this goal also other code options are implemented and discussed in this paper. Finally, we analyze in great detail the effect of the adaptive smoothing on galaxy photometry, in particular in terms of surface brightness (SB) profiles and aperture photometry: deviations in SB with respect to the original image can be limited to <0.01 mag, with flux difference in apertures of less than 0.001 mag.
Marli Lucia Tonatto Zibetti
Nuances : Estudos sobre Educa??o , 2012,
Abstract: O presente artigo analisa dados oriundos de uma prática etnográfica e busca compreender de que maneira se manifestam na prática pedagógica de uma professora alfabetizadora suas concep es sobre crian a. Os resultados apontam para a historicidade dos saberes docentes uma vez que a concep o de crian a presente em sua atua o remete-nos às idéias rosseaunianas de crian a. Por outro lado, evidenciam também como as condi es objetivas em que a prática se desenvolve influenciam a constitui o do fazer pedagógico. Os dados indicam ainda que a condu o do trabalho pedagógico pela professora participante da pesquisa contribui para o estabelecimento de uma rela o que favorece o envolvimento dos alunos com as atividades, embora este envolvimento nem sempre seja suficiente para o acesso aos conhecimentos necessários para a progress o na escolaridade.
Resolved optical-infrared SEDs of galaxies: universal relations and their break-down on local scales
Stefano Zibetti,Brent Groves
Physics , 2011, DOI: 10.1111/j.1365-2966.2011.19286.x
Abstract: A large body of evidence has demonstrated that the global rest-frame optical and IR colours of galaxies correlate well with each other, as well as with other galactic properties such as surface brightness and morphology. However the processes that lead to the observed correlations are contrary; the stellar light that contributes to the optical is readily absorbed by dust which emits in the IR. Thus on small scales we expect these correlations to break down. We examine seven nearby galaxies ranging from early- to late-types, on a pixel-by-pixel basis and we demonstrate that there is disconnect between the optical and IR when normalized to the near-IR (H-band). We can decompose this disconnect into two distinct components through a Principal Component Analysis of the H-band normalized SED of the pixels: one mainly correlated with variations in the IR, the other correlated with variations in the optical. By mapping these two components it is clear they arise from distinct spatial regions. The IR dominated component is strongly associated with the specific star-formation rate, while the optical-dominated component is broadly associated with the stellar mass density. However, when the pixels of all galaxies are compared, the well known optical-IR colour correlations return, demonstrating that the variance observed within galaxies is around a mean which follows the well-known trend. We also examine the extremely strong correlations between the IRAC-NIR colours and demonstrate that they are tight enough to use a single IRAC-NIR colour (i.e. 8mum-H) to determine the fluxes in the other IRAC bands. These correlations arise from the differing contribution of stellar light and dust to the IRAC bands, enabling us to determine pure stellar colours for these bands, but still demonstrating the need for dust (or stellar) corrections in these bands when being used as stellar (dust) tracers.
A Wood Preservative Based on Commercial Silica Nanodispersions and Boric Acid against Fungal Decay through Laboratory and Field Tests  [PDF]
Sabrina Palanti, Elisabetta Feci
Open Journal of Forestry (OJF) , 2013, DOI: 10.4236/ojf.2013.32009

The paper is based on the development of a wood preservative without metal salts to be used in use classes 3 and 4 (EN 335), eco-friendly and harmless to humans and animals. Boric acid was used as a biocide, due to its effectiveness against fungi and insects. It is also known to be easily leached from wood exposed to weather action. Colloidal silica was therefore added in the formulations to guarantee the fixation of boric acid to wood. The different formulations were tested for the protective efficacy against decay fungi through laboratory tests (EN 113) and field trials (EN 252). The results were promising, especially those concerning boron fixation and efficacy against decay fungi through laboratory tests, where some formulations and retentions gave a durability class 1 (very durable) according to EN 350-1. The fourth evaluation, after 50 months of field trials showed only a slight difference between the treated samples and controls.



A angústia no ofício de professor
Zibetti, Marli Lúcia Tonatto;
Psicologia Escolar e Educacional , 2004, DOI: 10.1590/S1413-85572004000200010
Abstract: this study analyses the diary records of a kindergarten teacher. extracts of the text make reference to the anguish of teaching. they were pointed out and classified as problems in freud‘s perspective. the analyses made, showed the importance of the class diary for the comprehension of the teacher‘s work, the pedagogical formation and the university research. some contributions of the psychoanalysis for a better understanding of the pedagogical actuation and for the teachers‘ formation.
Measuring the Horizon: Objectivity, Subjectivity and the Dignity of Human Personal Identity  [PDF]
Francis J. Ambrosio, Elisabetta Lanzilao
Open Journal of Philosophy (OJPP) , 2013, DOI: 10.4236/ojpp.2013.34A006
Abstract: It is argued in what follows that “culture warfare” is symptomatic of an imminent threat to the continued sustainability of human culture as a whole. The nature of this threat can be characterized as trauma induced paralysis of the human cultural imagination, without which cooperative adaptation to potential credible dangers of self-induced species or even planetary life extinction is impossible. The structure of this paradoxical “possible impossibility” as the destiny of humanity is examined here within the context of an interpretive framework which is broadly characterized as “cultural genetics”. On the basis of a schematic and preliminary outline of that framework, a suggestion is made regarding the direction in which hope of avoiding that destiny might be sought.
Complete III Cranial Nerve Palsy in a Leather Worker: An Unusual Case Report  [PDF]
Adriano Magli, Elisabetta Chiariello Vecchio
Open Journal of Ophthalmology (OJOph) , 2014, DOI: 10.4236/ojoph.2014.43014

This case report describes features and surgical management in one patient that developed a worsening total III cranial nerve palsy in his right eye. Our 45 year-old male patient worked for about 25 years in leather tanning industry. He underwent medical history, routine blood test, eye exams that included visual acuity measurement, slit-lamp examination, dilated retinal biomicroscopy and indirect ophthalmoscopy, fundus photography, tonometry, corneal pachymetry, Krimsky test, oculomotor examination and eye deviation surgery. On examination of the fellow eye wasn’t found any disease. Stroke, aneurysm and intracerebral causes of third nerve palsy were excluded, and medical history was negative for diabetes, cardiovascular disease, trauma, neurological disease unless two previous polyneuropathies episodes and one herpetic keratitis episode. Result of any neuroimaging studies were recorded (Our patients performed in hospital CT, MRI and MRI angiography and all the testes were normal). To our knowledge third cranial nerve palsy has never been observed in literature in leather workers. In conclusion, it is important for ophthalmologists to evaluate carefully work history and lifestyle persons and plan the surgical approach focusing the different characteristics of these patients.

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