183 research outputs found
Continuum Robots: From Conventional to Customized Performance Indicators
No full textContinuum robots have often been compared with rigid-link designs through conventional performance metrics (e.g., precision and Jacobian-based indicators). However, these metrics were developed to suit rigid-link robots and are tuned to capture specific facets of performance, in which continuum robots do not excel. Furthermore, conventional metrics either fail to capture the key advantages of continuum designs, such as their capability to operate in complex environments thanks to their slender shape and flexibility, or see them as detrimental (e.g., compliance). Previous work has rarely addressed this issue, and never in a systematic way. Therefore, this paper discusses the facets of a continuum robot performance that cannot be characterized by existing indicator and aims at defining a tailored framework of geometrical specifications and kinetostatic indicators. The proposed framework combines the geometric requirements dictated by the target environment and a methodology to obtain bioinspired reference metrics from a biological equivalent of the continuum robot (e.g., a snake, a tentacle, or a trunk). A numerical example is then reported for a swimming snake robot use case
Principal Vectors for Spatial Dynamical Analysis by Fischer
No full textOtto Fischer was during the late 19th and early 20th century the founder of 3-D human gait analysis. From motion recordings he calculated by hand the inverse dynamics of humans in motion, for which he discovered and used the principal vectors of a system of moving bodies. With the principal vectors the equations of motion and the kinetic energy can be written in a specific simple form with full geometric meaning and with reduced mass models with which system dynamics can be investigated in a simple way at link level. Fischer applied his theory mainly in its planar form. He also presented the theory of the spatial form by example of a serial two-link chain, however the explanations in the original texts in German are challenging to understand. This paper presents Fischer’s spatial form in a modern and understandable way.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Mechatronic Systems Desig
Etnocentrismo alimenticio de los consumidores leoneses: implicación del origen geográfico en sus preferencias de compra = Food ethnocentrism of leones consumers: Implication of the geographic origin in their buying preferences
No full text165 p.El comportamiento del consumidor se configura como una disciplina básica dentro de las diferentes ramas que configuran el estudio del marketing. Los factores que influyen en la conducta del consumidor son de dos tipos: externos e internos. Cuando nos referimos a los factores externos aludimos a diferentes aspectos como: la cultura del individuo, el conocimiento previo del producto o el grupo familiar al que pertenece. La cultura se configura como uno de los elementos externos que más influyen en el comportamiento del consumidor. El principal objetivo de esta investigación es analizar el grado de etnocentrismo alimenticio de los consumidores leoneses, saber que les conduce a ser etnocentristas, los efectos de su etnocentrismo en las actitudes hacia las importaciones y enfocar el estudio sobre las intenciones de compra en tres productos alimenticios: queso, vino tinto y manzan
Automatic modulation classification based on machine learning
No full textAutomatic Modulation Classification (AMC) is a rapidly evolving technology, which can be employed in software defined radio structures, such as for military communication. Machine Learning can provide novel and efficient technology for modulation classification, especially for systems working in low Signal to Noise Ratio (SNR). For this work, a dynamic modulation classification system without phase lock is trialed. The signals are captured with different SNR and duration. Traditional Machine Learning based on the mathematical features is compared with Deep Learning based on the constellations. Based on these two methods, a hybrid model is provided. This model involved the novel Deep Learning at first and the feature classification as a supplement, which achieves good performance at low SNR area
Sur les traces d’« Enjoy Phoenix »… ou comment la beauté et la pédagogie renforcent le pouvoir d’influence des Youtubeurs sur les consommateurs
No full textInternational audienceWalking on the tracks of "Enjoy Phoenix"... or how beauty and pedagogy strengthen the power of Youtuber'sinfluence on consumersThe user videos created and hosted on YouTube have a strong following among the hyper-connected public. Thesuccess of User Generated videos (UGV) attracts brands looking for interactive and powerful communicationactions. This article proposes to study the effects of the characteristics of a video's author on attitude and pur-chase intentions in the beauty field. Through two qualitative and one quantitative studies, we show the key roleof physical attractiveness, psychological proximity and a video’s pedagogical qualities as powerful vectors of aUGV’s persuasion.Les vidéos créés et hébergées sur YouTube par les utilisateurs provoquent l’engouement d’un public hyperconnecté. Le succès de ces User Generated Videos (UGV) attire les marques en quête d’actions de communi-cation interactives et puissantes. Cette recherche s’attache à étudier l’effet des caractéristiques de l’auteur de lavidéo et du message sur l’attitude et les intentions d’achat de la marque dans le contexte de la beauté. Au traversde deux études qualitatives et d’une étude quantitative, nous montrons le rôle de l’attractivité physique de laYoutubeuse, celui de la proximité psychologique et des qualités pédagogiques de la vidéo comme des vecteurspuissants de la persuasion des UGV
Sentence comprehension with a competing talker: the elusive nature of informational interference
No full textIn everyday environments, we often have to attend to one person’s speech (target speech) while ignoring another (competing speech). A competing talker can impair speech processing through both energetic masking (acoustic degradation at the periphery) and informational, cognitively-demanding aspects of the mask. We refer to the latter as informational interference. We hypothesized that informational interference depletes processing resources that could otherwise be allocated to recognizing and understanding target speech. Consequently, informational interference should be more pronounced when the task is more resource-demanding (more or less complex syntax) or when the participants’ own processing demands are elevated (non-native listeners). Finally, modulating the semantic content of the competing talker’s utterances should influence the degree of informational interference.
Using a speeded picture-selection task, we assessed native and non-native listeners’ understanding of spoken sentences varying in syntactic complexity, played with a competing talker or a matched energetic mask, at various signal-to-noise ratios (SNRs). In a follow-up experiment, the semantic content of the competing talker sentences was manipulated to be congruent, incongruent or unrelated to the target sentence. Participants’ performance was measured with accuracy and reaction times from button presses, as well as eye-tracking. Selective attention, short-term and working memory were assessed to determine the contribution of these cognitive factors to informational interference.
Although syntactic complexity affected participants’ performance, the competing talker was not more detrimental than the energetic mask controls, contrary to our hypothesis. This pattern was comparable for native and non-native listeners, and across SNRs. In the follow-up experiment there was no difference between semantically incongruent and neutral competing sentences, but semantically congruent sentences led to faster sentence processing, indicating facilitation or priming. This indicates that the content of the competing talker is not indiscriminately inhibited. Moreover, individual differences in memory and selective attention were not related to differences in the speeded-selection task, regardless of the mask. These results provide little support for the existence of a uniquely informational source of speech masking
The Image As a Tool For Building the Linguistic and Multicultural Identity Of the Learner. 1st Year French Language Students As a Case Study
No full textIn this article, we focus on the role that the image sheers, no longer as an object of pleasure, but rather as a revealing tool for the learner’s identity. To do this, we analyzed drawings produced by university students, in plurilingual and pluricultural identity of each learner. The analysis of the drawings shows that learners mostly provide a plurilingual and pluricultural repertoire
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