Search results for "REPRESENTATION"
showing 10 items of 1710 documents
Cocharacters of Bilinear Mappings and Graded Matrices
2012
Let Mk(F) be the algebra of k ×k matrices over a field F of characteristic 0. If G is any group, we endow Mk(F) with the elementary grading induced by the k-tuple (1,...,1,g) where g ∈ G, g2 ≠ 1. Then the graded identities of Mk(F) depending only on variables of homogeneous degree g and g − 1 are obtained by a natural translation of the identities of bilinear mappings (see Bahturin and Drensky, Linear Algebra Appl 369:95–112, 2003). Here we study such identities by means of the representation theory of the symmetric group. We act with two copies of the symmetric group on a space of multilinear graded polynomials of homogeneous degree g and g − 1 and we find an explicit decomposition of the …
Animated Representations. Multimedia Techniques for Storytelling
2023
The paper presents the results of two case studies that use multimedia language for the knowledge, appreciation and communication of works of art of different epochs, nature and location and that, through the tools of Representation, make use of digital methods of animation and visualisation. The final results concern the creation of multimedia products designed to narrate a conceptual path, through a reasoned animation of raster and vectorial products. Together with the necessary technical and IT skills, it is essential to reaffirm the role of representation, which is central to image processing, recognition of graphic analogies, study of proportions, knowledge of the laws of visual percep…
Graphic Analysis Between Teaching and Research. Mario Ridolfi Unbuilt
2017
The graphic analysis in absentia, moving between thought and work, tries to track down, through digital surveys, a consistent path of design process. For many years now, the digital has changed the communication architecture processes that have always been areas of critics and representation. Architecture, indeed, can be told with texts, and new and unreleased representations wandering the sites of fruitful interaction between theoretical production and digital processing. The purpose of this study is to tell two projects, through unpublished images, about a little-known Ridolfi, through the close relationship between history, drawing and project.
Looking Across Instead of Back and Forth: How the Simultaneous Presentation of Multiple Animation Episodes Facilitates Learning
2017
Many learning tasks require students to induce higher-order relationships from the learning material. Compare and contrast processes play a pivotal role in solving such inductive tasks. Different presentations of animation episodes offer affordances to students that can either impede or facilitate compare and contrast processes. While conventional behaviorally realistic animations typically present multiple episodes one after the other, i.e. sequentially, simultaneous presentation offers a feasible alternative. We investigated how the sequential and simultaneous presentation of multiple animation episodes affects students’ perceptual interrogation of the animation as well as their learning …
Processing and learning from multiple sources: A comparative case study of students with dyslexia working in a multiple source multimedia context
2019
This study investigated how four 10th-grade students with dyslexia processed and integrated information across web pages and representations when learning in a multiple source multimedia context. Eye movement data showed that participants’ processing of the materials varied with respect to their initial exploration of the web pages, their overall processing time, and the linearity of their processing patterns, with post-learning interviews indicating the deliberate, strategic considerations underlying each participant’s processing pattern. Eye movement data in terms of fixation duration and percentage of regressions also corroborated the findings of formal, diagnostic assessments. Finally, …
Analysis of the multipactor effect by means of the 3D BI-RME method
2017
Multipactor effect is a well-known phenomenon of RF breakdown in satellite pay-loads which degrades components, generates undesirable harmonics, contributes to power dissipation and increases noise in communications. Traditionally, multipactor has been investigated with the aim of obtaining the so-called multipactor threshold voltage, or to present different multipaction detection methods. Little effort has been devoted, in contrast, to study the problem from a full-wave point of view, thus allowing for the analysis of more complex structures. The main goal of this work is to analyze the interaction between a multipactor current and a realistic microwave cavity by means of a rigorous and ac…
Knowledge Acquisition from Multiple Experts Based on Semantics of Concepts
1999
This paper presents one approach to acquire knowledge from multiple experts. The experts are grouped into a multilevel hierarchical structure, according to the type of knowledge acquired. The first level consists of experts who have knowledge about the basic objects and their relationships. The second level of experts includes those who have knowledge about the relationships of the experts at the first level and each higher level accordingly. We show how to derive the most supported opinion among the experts at each level. This is used to order the experts into categories of their competence defined as the support they get from their colleagues.
Measuring Connectivity in Linear Multivariate Processes: Definitions, Interpretation, and Practical Analysis
2011
This tutorial paper introduces a common framework for the evaluation of widely used frequency-domain measures of coupling (coherence, partial coherence) and causality (directed coherence, partial directed coherence) from the parametric representation of linear multivariate (MV) processes. After providing a comprehensive time-domain definition of the various forms of connectivity observed in MV processes, we particularize them to MV autoregressive (MVAR) processes and derive the corresponding frequency-domain measures. Then, we discuss the theoretical interpretation of these MVAR-based connectivity measures, showing that each of them reflects a specific time-domain connectivity definition an…
Different Representation Procedures Originated from Multivariate Temporal Pattern Analysis of the Behavioral Response to Pain in Wistar Rats Tested i…
2019
Temporal pattern analysis is an advanced multivariate technique able to investigate the structure of behavior by unveiling the existence of statistically significant constraints among the interval length separating events in sequence. If on the one hand, such an approach allows investigating the behavioral response to pain in its most intimate and inner features, on the other hand, due to the meaning of the studies on pain, it is of relevant importance that the results utilize intuitive and easily comprehensible ways of representation. The aim of this paper is to show various procedures useful to represent the results originating from the multivariate T-pattern analysis of the behavioral re…
Multivariate and Multiscale Complexity of Long-Range Correlated Cardiovascular and Respiratory Variability Series
2020
Assessing the dynamical complexity of biological time series represents an important topic with potential applications ranging from the characterization of physiological states and pathological conditions to the calculation of diagnostic parameters. In particular, cardiovascular time series exhibit a variability produced by different physiological control mechanisms coupled with each other, which take into account several variables and operate across multiple time scales that result in the coexistence of short term dynamics and long-range correlations. The most widely employed technique to evaluate the dynamical complexity of a time series at different time scales, the so-called multiscale …