1,720,957 research outputs found
Incitation à l’activité physique des personnes âgées par réseaux de capteurs sans fil
No full textToday, regular physical activity is an effective way to maintain goodhealth, especially with age. Despite this, older people are often sedentary and do not reach recommended levels. The use of body sensor networks is therefore part of a strategy to encourage physical activity. In this thesis, we propose a solution based ona device worn on the wrist and which transmits data related to physical activity during walking. The device is connected using optical wireless technology, which is an alternative to radiofrequency one that, with the growing number of connected objects, have limits in terms of interference, security and confidentiality. The objective is to determine the characteristics and the optimal performances by taking into account the specificities related to the scenario but also to the age of the person. We propose a suitable optical wireless communication channel model for this purpose and we discuss the impact of the body modelof the person, young or old, the step length, the walking speed and the limb movements. All of these parameters depend on age. To take into account the temporal evolution of performance during walking, outage probability is determined by taking into account the correlation by the sliding window technique. We show both theoretically and experimentally that by considering a model of a young person, performance can be underestimated or overestimated. It is therefore important to use a suitable elderly person model to effectively design the system. In addition, to guarantee connectivity while walking, a hybrid system is proposed where a radio link takes over from the optical system when the latter is broken. The hybrid system performance is studied with the objective of minimizing radio transmission timeshowingthe effectiveness of the hybrid system for monitoringan elderly person.Aujourd’hui, il est admis que la pratique d'une activité physique régulière est un moyen efficace de se maintenir en bonne santé, notamment avec l'âge. Malgré cela, les personnes âgées sont souvent sédentaires et n'atteignent pas les niveaux recommandés. Ainsi, l'utilisation de réseaux de capteurs corporels s'inscrit dans une stratégie d'incitation. Dans cette thèse, nous proposons une solution basée sur un dispositif porté au poignet transmettant des données liées à une activité de marche. Le dispositif communique par optique sans fil, une alternative aux radiofréquences qui avec le nombre croissant d'objets connectés ont des limites en termes d'interférences, de sécurité et de confidentialité. L'objectif est de mettre en œuvre une méthodologie pour déterminer les caractéristiques et les performances optimales de communication pour le suivi de la marche en prenant en compte les spécificités liées au scénario mais aussi à l'âge de la personne. Nous proposons un modèle de canal de communication optique sans fil adapté à cet effet et nous discutons de l'impact du modèle corporel de la personne, jeune ou âgée, de la longueur des pas, de la vitesse de marche, des mouvements des membres sur un cycle de marche. Tous ces paramètres dépendent de l'âge. Pour prendre en compte l'évolution temporelle des performances lors de la marche, la probabilité de rupture du lien est déterminée en considérant la corrélation par la technique de la fenêtre glissante. Nous montrons à la fois théoriquement et expérimentalement qu’avec un modèle de personne jeune, la performance peut être sous-estimée ou surestimée. Il est donc important d'utiliser un modèle de personne âgée adapté pour concevoir efficacement le système de surveillance. De plus, afin de garantir la connectivité au cours de la marche, un système hybride est proposé où une liaison radio prend le relais lorsque le lien optique est rompu. La performance du système hybride est étudiée avec l'objectif de minimiser le pourcentage de temps d'utilisation de la radio, montrant l'efficacité du système hybride pour le suivi d'une personne âgée
Wireless body network as a solution to encourage physical activity in the elderly
No full textAujourd’hui, il est admis que la pratique d'une activité physique régulière est un moyen efficace de se maintenir en bonne santé, notamment avec l'âge. Malgré cela, les personnes âgées sont souvent sédentaires et n'atteignent pas les niveaux recommandés. Ainsi, l'utilisation de réseaux de capteurs corporels s'inscrit dans une stratégie d'incitation. Dans cette thèse, nous proposons une solution basée sur un dispositif porté au poignet transmettant des données liées à une activité de marche. Le dispositif communique par optique sans fil, une alternative aux radiofréquences qui avec le nombre croissant d'objets connectés ont des limites en termes d'interférences, de sécurité et de confidentialité. L'objectif est de mettre en œuvre une méthodologie pour déterminer les caractéristiques et les performances optimales de communication pour le suivi de la marche en prenant en compte les spécificités liées au scénario mais aussi à l'âge de la personne. Nous proposons un modèle de canal de communication optique sans fil adapté à cet effet et nous discutons de l'impact du modèle corporel de la personne, jeune ou âgée, de la longueur des pas, de la vitesse de marche, des mouvements des membres sur un cycle de marche. Tous ces paramètres dépendent de l'âge. Pour prendre en compte l'évolution temporelle des performances lors de la marche, la probabilité de rupture du lien est déterminée en considérant la corrélation par la technique de la fenêtre glissante. Nous montrons à la fois théoriquement et expérimentalement qu’avec un modèle de personne jeune, la performance peut être sous-estimée ou surestimée. Il est donc important d'utiliser un modèle de personne âgée adapté pour concevoir efficacement le système de surveillance. De plus, afin de garantir la connectivité au cours de la marche, un système hybride est proposé où une liaison radio prend le relais lorsque le lien optique est rompu. La performance du système hybride est étudiée avec l'objectif de minimiser le pourcentage de temps d'utilisation de la radio, montrant l'efficacité du système hybride pour le suivi d'une personne âgée.Today, regular physical activity is an effective way to maintain goodhealth, especially with age. Despite this, older people are often sedentary and do not reach recommended levels. The use of body sensor networks is therefore part of a strategy to encourage physical activity. In this thesis, we propose a solution based ona device worn on the wrist and which transmits data related to physical activity during walking. The device is connected using optical wireless technology, which is an alternative to radiofrequency one that, with the growing number of connected objects, have limits in terms of interference, security and confidentiality. The objective is to determine the characteristics and the optimal performances by taking into account the specificities related to the scenario but also to the age of the person. We propose a suitable optical wireless communication channel model for this purpose and we discuss the impact of the body modelof the person, young or old, the step length, the walking speed and the limb movements. All of these parameters depend on age. To take into account the temporal evolution of performance during walking, outage probability is determined by taking into account the correlation by the sliding window technique. We show both theoretically and experimentally that by considering a model of a young person, performance can be underestimated or overestimated. It is therefore important to use a suitable elderly person model to effectively design the system. In addition, to guarantee connectivity while walking, a hybrid system is proposed where a radio link takes over from the optical system when the latter is broken. The hybrid system performance is studied with the objective of minimizing radio transmission timeshowingthe effectiveness of the hybrid system for monitoringan elderly person
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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