1,721,279 research outputs found
Decision making assessment in industrial process simulation
No full textHuman factors play a major role in process industry to increase safety. The problem of assessing human performance and identify most critical human factors is very complex in a real plant, while simulation in a virtual reality (VR) context provides freedom to test and train for risky situations. On the other hand not all aspects of human factors can be easily assessed in a simulated VR environment. We can distinguish operative skills from more cognitive ones, like, e.g., communication, situation understanding, operation planning, and problem solving. While operative skills could be easily trained and tested also in a real context, communication, command, decision-making and problem solving are more difficult and can be better assessed in a VR context, by controlling the execution of simulation experiments. In this paper we present an approach to assess cognitive human factors to improve safety. The approach proposes a way to automatically detect critical actions and events necessary to assess and measure performances of command and control roles, which can also be extended to measure and assess operative roles performances
EEG recording and signal analysis in cognitive response elicitation
No full textWe aim at developing computational methods for the analysis of the signal produced by EEG devices in response to simple visual stimuli, to evaluate their impact on perceptual and cognitive processes. In particular, the work is focused on the study and the experimentation of innovative signal processing methods to measure the electroencephalographic answer to specific stimuli. To this aim, we have performed some preliminary experiments collecting EEG data using a Brain-Computer Interface (BCI) device from two groups of users, subjected to simple visual, such as Gestalt images used as stimuli eliciting basic cognitive processe
A computational approach to color adaptation effects
No full textThe human vision system has adaptation mechanisms that cannot be managed with the classic tri-stimulus color theory. The effects of these mechanisms are clearly visible in some well-known perception phenomena as color illusions, but they are always present in human observation. The discrepancy between the observation of a real scene and the observation of a picture taken from the same scene, derives from the fact that the camera does not have such mechanisms. In this paper, we propose a biologically inspired implementation of the Retinex algorithm, introduced by Land and McCann, that simulates these adaptation mechanisms, in order to reproduce some effects like dynamic adjustment, color constancy, etc. typical of the human vision system. The algorithm has been tested not only on a Mondrian-like patchwork to measure its effect, but also on different pictures, photographs and typical color illusions to test its adaptation effects. The examples demonstrate the ability of the model to emulate some characteristics of human color perception and to obtain better equalized and color-corrected images
Malattia di Meleda: segnalazione di un caso e revisione della letteratura degli ultimi trent’anni
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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