Academic literature on the topic 'Connexion internet'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Connexion internet.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Connexion internet"

1

Baltezarevic, Radoslav, Borivoje Baltezarevic, Piotr Kwiatek, and Vesna Baltezarevic. "The Impact of Virtual Communities on Cultural Identity." Symposion 6, no. 1 (2019): 7–22. http://dx.doi.org/10.5840/symposion2019611.

Full text
Abstract:
The emergence of the Internet and various forms of virtual communities has led to the impact of a new social space on individuals who frequently replace the real world with alternative forms of socializing. In virtual communities, new ‘friendships’ are easily accepted; however, how this acceptance influences cultural identity has not been investigated. Based on the data collected from 443 respondents in the Republic of Serbia, authors analyze this connexion, as well as how the absorption of others’ cultural values is reflected on the local cultural values. The results show that the adoption of others’ cultural values diminished the bond with the local community. The present paper adds to the theory of virtual communities by examining the relationship between the acceptance of an unknown person in a virtual community and its effects on cultural identity. This study contributes to the clarification of the impact that virtual networking has on cultural identity.
APA, Harvard, Vancouver, ISO, and other styles
2

Nielsen, Peter A., Amos Baruch, Valery I. Shestopalov, Ben N. G. Giepmans, Irene Dunia, E. Lucio Benedetti, and Nalin M. Kumar. "Lens Connexins α3Cx46 and α8Cx50 Interact with Zonula Occludens Protein-1 (ZO-1)." Molecular Biology of the Cell 14, no. 6 (June 2003): 2470–81. http://dx.doi.org/10.1091/mbc.e02-10-0637.

Full text
Abstract:
Connexin α1Cx43 has previously been shown to bind to the PDZ domain–containing protein ZO-1. The similarity of the carboxyl termini of this connexin and the lens fiber connexins α3Cx46 and α8Cx50 suggested that these connexins may also interact with ZO-1. ZO-1 was shown to be highly expressed in mouse lenses. Colocalization of ZO-1 with α3Cx46 and α8Cx50 connexins in fiber cells was demonstrated by immunofluorescence and by fracture-labeling electron microscopy but showed regional variations throughout the lens. ZO-1 was found to coimmunoprecipitate with α3Cx46 and α8Cx50, and pull-down experiments showed that the second PDZ domain of ZO-1 was involved in this interaction. Transiently expressed α3Cx46 and α8Cx50 connexins lacking the COOH-terminal residues did not bind to the second PDZ domain but still formed structures resembling gap junctions by immunofluorescence. These results indicate that ZO-1 interacts with lens fiber connexins α3Cx46 and α8Cx50 in a manner similar to that previously described for α1Cx43. The spatial variation in the interaction of ZO-1 with lens gap junctions is intriguing and is suggestive of multiple dynamic roles for this association.
APA, Harvard, Vancouver, ISO, and other styles
3

Kopanic, Jennifer L., Barbara Schlingmann, Michael Koval, Alan F. Lau, Paul L. Sorgen, and Vivian F. Su. "Degradation of gap junction connexins is regulated by the interaction with Cx43-interacting protein of 75 kDa (CIP75)." Biochemical Journal 466, no. 3 (March 6, 2015): 571–85. http://dx.doi.org/10.1042/bj20141042.

Full text
Abstract:
Connexins are a family of transmembrane proteins that form gap junction channels. These proteins undergo both proteasomal and lysosomal degradation, mechanisms that serve to regulate connexin levels. Our previous work described CIP75 [connexin43 (Cx43)-interacting protein of 75 kDa], a protein involved in proteasomal degradation, as a novel Cx43-interacting protein. We have discovered two additional connexins, connexin40 (Cx40) and connexin45 (Cx45), that interact with CIP75. Nuclear magnetic resonance (NMR) analyses identified the direct interaction of the CIP75 UBA domain with the carboxyl-terminal (CT) domains of Cx40 and Cx45. Reduction in CIP75 by shRNA in HeLa cells expressing Cx40 or Cx45 resulted in increased levels of the connexins. Furthermore, treatment with trafficking inhibitors confirmed that both connexins undergo endoplasmic reticulum-associated degradation (ERAD), and that CIP75 preferentially interacts with the connexin proteins bound for proteasomal degradation from the ER. In addition, we have also discovered that CIP75 interacts with ER-localized Cx32 in a process that is likely mediated by Cx32 ubiquitination. Thus, we have identified novel interacting connexin proteins of CIP75, indicating a role for CIP75 in regulating the levels of connexins in general, through proteasomal degradation.
APA, Harvard, Vancouver, ISO, and other styles
4

Evans, W. Howard, Elke De Vuyst, and Luc Leybaert. "The gap junction cellular internet: connexin hemichannels enter the signalling limelight." Biochemical Journal 397, no. 1 (June 14, 2006): 1–14. http://dx.doi.org/10.1042/bj20060175.

Full text
Abstract:
Cxs (connexins), the protein subunits forming gap junction intercellular communication channels, are transported to the plasma membrane after oligomerizing into hexameric assemblies called connexin hemichannels (CxHcs) or connexons, which dock head-to-head with partner hexameric channels positioned on neighbouring cells. The double membrane channel or gap junction generated directly couples the cytoplasms of interacting cells and underpins the integration and co-ordination of cellular metabolism, signalling and functions, such as secretion or contraction in cell assemblies. In contrast, CxHcs prior to forming gap junctions provide a pathway for the release from cells of ATP, glutamate, NAD+ and prostaglandin E2, which act as paracrine messengers. ATP activates purinergic receptors on neighbouring cells and forms the basis of intercellular Ca2+ signal propagation, complementing that occuring more directly via gap junctions. CxHcs open in response to various types of external changes, including mechanical, shear, ionic and ischaemic stress. In addition, CxHcs are influenced by intracellular signals, such as membrane potential, phosphorylation and redox status, which translate external stresses to CxHc responses. Also, recent studies demonstrate that cytoplasmic Ca2+ changes in the physiological range act to trigger CxHc opening, indicating their involvement under normal non-pathological conditions. CxHcs not only respond to cytoplasmic Ca2+, but also determine cytoplasmic Ca2+, as they are large conductance channels, suggesting a prominent role in cellular Ca2+ homoeostasis and signalling. The functions of gap-junction channels and CxHcs have been difficult to separate, but synthetic peptides that mimic short sequences in the Cx subunit are emerging as promising tools to determine the role of CxHcs in physiology and pathology.
APA, Harvard, Vancouver, ISO, and other styles
5

Foote, Cynthia I., Lan Zhou, Xing Zhu, and Bruce J. Nicholson. "The Pattern of Disulfide Linkages in the Extracellular Loop Regions of Connexin 32 Suggests a Model for the Docking Interface of Gap Junctions." Journal of Cell Biology 140, no. 5 (March 9, 1998): 1187–97. http://dx.doi.org/10.1083/jcb.140.5.1187.

Full text
Abstract:
Connexins, like true cell adhesion molecules, have extracellular domains that provide strong and specific homophilic, and in some cases, heterophilic interactions between cells. Though the structure of the binding domains of adhesion proteins have been determined, the extracellular domains of connexins, consisting of two loops of ∼34–37 amino acids each, are not easily studied in isolation from the rest of the molecule. As an alternative, we used a novel application of site-directed mutagenesis in which four of the six conserved cysteines in the extracellular loops of connexin 32 were moved individually and in all possible pairwise and some quadruple combinations. This mapping allowed us to deduce that all disulfides form between the two loops of a single connexin, with the first cysteine in one loop connected to the third of the other. Furthermore, the periodicity of movements that produced functional channels indicated that these loops are likely to form antiparallel β sheets. A possible model that could explain how these domains from apposed connexins interact to form a complete channel is discussed.
APA, Harvard, Vancouver, ISO, and other styles
6

Yeh, Hung-I., Emmanuel Dupont, Steven Coppen, Stephen Rothery, and Nicholas J. Severs. "Gap Junction Localization and Connexin Expression in Cytochemically Identified Endothelial Cells of Arterial Tissue." Journal of Histochemistry & Cytochemistry 45, no. 4 (April 1997): 539–50. http://dx.doi.org/10.1177/002215549704500406.

Full text
Abstract:
Vascular endothelial cells interact with one another via gap junctions, but information on the precise connexin make-up of endothelial gap junctions in intact arterial tissue is limited. One factor contributing to this lack of information is that standard immunocytochemical methodologies applied to arterial sections do not readily permit unequivocal localization of connexin immunolabeling to endothelium. Here we introduce a method for multiple labeling with specific endothelial cell markers and one or more connexin-specific antibodies which overcomes this limitation. Applying this method to localize connexins 43, 40, and 37 by confocal microscopy, we show that the three connexin types have quite distinctive labeling patterns in different vessels. Whereas endothelial cells of rat aorta and coronary artery characteristically show extensive, prominent connexin40, and heterogeneous scattered connexin37, the former, unlike the latter, also has abundant connexin43. The relative lack of connexin43 in coronary artery endothelium was confirmed in both rat and human using three alternative antibodies. In the aorta, connexins43 and 40 commonly co-localize to the same junctional plaque. Even within a given type of endothelium, zonal variation in connexin expression was apparent. In rat endocardium, a zone just below the mitral valve region is marked by expression of greater quantities of connexin43 than surrounding areas. These results are consistent with the idea that differential expression of connexins may contribute to modulation of endothelial gap junction function in different segments and subzones of the arterial system.
APA, Harvard, Vancouver, ISO, and other styles
7

Bruzzone, R., J. A. Haefliger, R. L. Gimlich, and D. L. Paul. "Connexin40, a component of gap junctions in vascular endothelium, is restricted in its ability to interact with other connexins." Molecular Biology of the Cell 4, no. 1 (January 1993): 7–20. http://dx.doi.org/10.1091/mbc.4.1.7.

Full text
Abstract:
The cellular distribution of connexin40 (Cx40), a newly cloned gap junction structural protein, was examined by immunofluorescence microscopy using two different specific anti-peptide antibodies. Cx40 was detected in the endothelium of muscular as well as elastic arteries in a punctate pattern consistent with the known distribution of gap junctions. However, it was not detected in other cells of the vascular wall. By contrast, Cx43, another connexin present in the cardiovascular system, was not detected in endothelial cells of muscular arteries but was abundant in the myocardium and aortic smooth muscle. We have tested the ability of these connexins to interact functionally. Cx40 was functionally expressed in pairs of Xenopus oocytes and induced the formation of intercellular channels with unique voltage dependence. Unexpectedly, communication did not occur when oocytes expressing Cx40 were paired with those expressing Cx43, although each could interact with a different connexin, Cx37, to form gap junction channels in paired oocytes. These findings indicate that establishment of intercellular communication can be spatially regulated by the selective expression of different connexins and suggest a mechanism that may operate to control the extent of communication between cells.
APA, Harvard, Vancouver, ISO, and other styles
8

El Bettioui, Rachid, Abdelkhalil Haidane, Lhassane Jaouhari, and Samir Mirdasse. "Digitalisation pédagogique et défis de l’enseignement à distance." revistamultidisciplinar.com 4, no. 1 (2022): 27–48. http://dx.doi.org/10.23882/rmd.22083.

Full text
Abstract:
La digitalisation représente, de notre temps, une nécessité de développement et de compétitivité de la majorité des secteurs. Le secteur de l’enseignement supérieur n’échappe pas de cette transformation digitale. Ainsi, au cours des deux dernières décennies, la pédagogie digitale est devenue l'une des formes d'apprentissage les plus adéquates pour la génération actuelle des étudiants de l'enseignement supérieur qui préfèrent un modèle de formation doté des smart universités. Dans ce cadre, le présent article consiste à étudier les défis de l’enseignement à distance appliqué au Maroc pendant la pandémie de COVID-19 pour maintenir la formation des étudiants. La méthode de recherche utilisée est la méthode quantitative. Ainsi, un questionnaire en ligne a été rempli par 487 étudiants de l’Ecole supérieure de technologie d’Agadir de l’université Ibn Zohr au Maroc. Les données collectées ont été analysées premièrement par la méthode descriptive (statistique descriptive uni-variée), puis par la méthode analytique en appliquant le Test de Khi-deux, à l’aide du logiciel IBM SPSS Statistics. Cette dernière a été menée pour analyser les relations entre les variables du modèle conceptuel. Les résultats de cette recherche ont révélé que l’accélération de la transformation digitale de l’enseignement supérieur fait face à plusieurs défis. Au niveau des apprenants, de nombreux étudiants éprouvent de sérieuses difficultés à utiliser les plateformes digitales de l’enseignement à savoir le problème de lenteur et de coût de connexion internet, la qualité de la vidéo et du son des vidéoconférences, la difficulté de compréhension des cours… Par conséquent, ils ne participent pas toujours à leurs classes virtuelles.
APA, Harvard, Vancouver, ISO, and other styles
9

Giaume, Christian, Christian C. Naus, Juan C. Sáez, and Luc Leybaert. "Glial Connexins and Pannexins in the Healthy and Diseased Brain." Physiological Reviews 101, no. 1 (January 1, 2021): 93–145. http://dx.doi.org/10.1152/physrev.00043.2018.

Full text
Abstract:
Over the past several decades a large amount of data have established that glial cells, the main cell population in the brain, dynamically interact with neurons and thus impact their activity and survival. One typical feature of glia is their marked expression of several connexins, the membrane proteins forming intercellular gap junction channels and hemichannels. Pannexins, which have a tetraspan membrane topology as connexins, are also detected in glial cells. Here, we review the evidence that connexin and pannexin channels are actively involved in dynamic and metabolic neuroglial interactions in physiological as well as in pathological situations. These features of neuroglial interactions open the way to identify novel non-neuronal aspects that allow for a better understanding of behavior and information processing performed by neurons. This will also complement the “neurocentric” view by facilitating the development of glia-targeted therapeutic strategies in brain disease.
APA, Harvard, Vancouver, ISO, and other styles
10

Semeki Ngabinzeke, Jean, Mikhail Pitchugin, Julie Linchant, Cédric Vermeulen, Jean-Marie Kahindo Muhongya, and Philippe Lejeune. "Une méthode simple et rapide pour l’évaluation de statistiques d’occupation du sol à l’aide d’images à très haute résolution acquises par mini-drone." BOIS & FORETS DES TROPIQUES 335 (March 15, 2018): 15. http://dx.doi.org/10.19182/bft2018.335.a31497.

Full text
Abstract:
Le suivi de l’utilisation des terres par télédétection a récemment connu un essor important. Cela s’explique par une accessibilité accrue et souvent gratuite des images à (très) haute résolution ainsi que par le développement d’applications web destinées au suivi de l’utilisation des terres. L’accès à ces applications reste cependant soumis à l’existence d’une connexion Internet fiable faisant encore défaut dans certaines régions du globe. Dans ce contexte, la présente étude décrit une méthode permettant de produire des statistiques sur l’évolution de l’occupation du sol en réalisant une photo-interprétation par point sur des images en couleurs vraies à très haute résolution produites par mini-drone. La méthode utilise une application (PINT pour Photo-INTerprétation) intégrée dans le logiciel open source QGIS. Les surfaces de différentes occupations du sol sont dérivées des estimations des proportions de points affectées à chaque classe à partir d’une grille systématique. Pour illustrer l’intérêt de l’outil, l’étude considère les statistiques d’occupation du sol au sein de deux terroirs villageois du Complexe d’aires protégées de la Garamba, en République démocratique du Congo. Les résultats obtenus sont comparés avec ceux d’une cartographie de référence basée sur une photo-interprétation exhaustive après segmentation des images. Les écarts entre surfaces estimées par échantillonnage et surfaces de référence varient entre 0,2 % et 6,1 % pour les principales occupations du sol (forêts et savanes, défriches, jachères, implantations humaines et cultures). Des différences plus importantes (17,4 % et 13,4 %) sont enregistrées pour la classe « arbres isolés ». Le temps global de mise en œuvre de la méthode est de l’ordre de 60 ha par heure d’opérateur. L’utilisation du plugin PINT avec des images « drone » constitue une solution pertinente pour estimer des statistiques d’occupation du sol dans des régions web-isolées et pour des sites d’étendues de quelques (dizaines de) km².
APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "Connexion internet"

1

Abu, Oun Osama. "Conception d'une plate-forme multi-échelle hybride pour évaluer les performances de systèmes orientés internet des objets." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2015/document.

Full text
Abstract:
Les chercheurs au travers de plusieurs domaines essaient de fournir des solutions pour intégrer les objets et les systèmes dans l’internet des objets (IdO ou IoT pour Internet of Things en anglais). Il y a deux domaines parmi les domaines les plus importants d’IdO. Le premier est de tester et évaluer l’IdO. Plusieurs milliards d’objets sont déjà connectés à l’internet. Ces objets peuvent communiquer entre eux directement sans intervention humaine. Les entreprises et les développeurs doivent être capable de tester et d’évaluer des scénarios différents dans plusieurs environnements. Ces environnements doivent être capable d’échanger des services entre eux. Nous présentons notre architecture IoTaaS (Internet of Things Testing As A Service). IoTaaS est un environnement distribué pour tester et évaluer l’IdO. Nous présentons aussi la première mise en oeuvre expérimentale qui est appelée CEMAT (Cloud Environment for Mobile Application Testing) qui permet de tester les applications mobiles et les objets connectés. Le deuxième domaine correspond aux méthodes de communication. Nous présentons notre conception de communications COLDE (Connectionless Data Exchange) pour échanger une petite quantité de données publiques entre les clients Wi-Fi et les points d’accès sans qu’ils aient besoin d’être associés. Alors que COLDE présente la méthode nécessaire pour échanger ces données, le concept de services Lightweight décrit les données échangées en utilisant le protocole COLDE
Researchers across many domains are working to provide solutions that enable integration of objectsand systems into the Internet of Things (IoT). There are two domains which are among the mostimportant ones in IoT. First domain is IoT testing and evaluation. The billions of objects whichare connected to IoT would intercommunicate without any human intervention. Enterprises anddevelopers should be able to test and evaluate different operational scenarios of their systems indifferent environments. Testing environments should be able to exchange services. We present ourarchitecture IoTaaS (Internet of Things Testing As A Service). IoTaaS is a hierarchy of a distributedcloud for testing and evaluating IoT. We also present the pilot implementation of IoTaaS under thecode name CEMAT (Cloud Environment for Mobile Application Testing) which focuses on mobiledevices and their connected objects. The second domain is about communication methods andtechniques. Several IoT applications depend on public data exchange. We present our design toexchange small amount of public data on wireless network without establishing a connection. COLDE(Connectionless Data Exchange) is our extension to protocol the IEEE 802.11. COLDE utilizesthe management frames to allow Wi-Fi devices and access points to exchange small amounts ofdata without having any association. COLDE describes how we can exchange data without beingconnected. Lightweight services concept explains which data could be transferred using COLDE.Simulation experiments and real world implementation are presented along with their results
APA, Harvard, Vancouver, ISO, and other styles
2

Justinia, Hanitravelo Giffona Loysell. "Impacts des technologies numériques sur les exploitations agricoles en France." Thesis, Rennes, Agrocampus Ouest, 2020. https://tel.archives-ouvertes.fr/tel-03711385.

Full text
Abstract:
Dans ce travail de thèse, il a constaté que l’étude des technologies numériques dans l’agriculture est récente dans le domaine de l’économie et par un scoping review, il a été identifié certains gaps dont le manque des études empiriques. Ainsi, quatre technologies ont été étudiées : connexion internet, robot de traite, outils d’aide à la décision (OAD) et outils de surveillances électroniques. Dans le secteur du lait, elles augmentent la production mais les effets sont plus importants pour les petites et moyennes exploitations. Plus important encore, les technologies connexion internet et OAD sont bénéfiques à tous les agriculteurs, utilisateurs ou non, puisque grâce à la proximité physique, ils arrivent à capter les effets d’agglomération techniques.Aussi, il a été trouvé qu’il existe un certain effet de rebond dans l’impact des technologies sur la production d’effluent. La contribution de la thèse est tout d’abord,nous avions été le premier, à notre connaissance, à avoir pu estimer ces effets à l’échelle nationale, effectivement les données étant encore très récentes l’appariement de plusieurs sources a été notre premier défi. Ensuite, nous avions appliqué deux nouvelles approches pour estimer les effets d’une utilisation de technologie, le Two-Stage least square (Geraci et al., 2014) et le Coarsening Exact Matching (Iacus et al, 2008) qui promettent des résultats plus pertinents pour notre contexte de donnée en coupe transversale et présentant une endogénéité. Enfin, la dernière contribution de la thèse est d’apporter des recommandations afin de permettre aux politiques publiques de comprendre les effets des nouvelles technologies et promouvoir les meilleures d'entre elles
In this thesis, it was found that the subject of study of digital technologies is still recent in the field of agricultural economics. Thus, through a scoping review, gaps were identified whose lack of empirical studies, as well as today's digital technologies, can be categorized into four groups: connection, recording, decision and execution. In the milk sector, these innovations increase production, but these advantages are inversely proportional to the intensity of production. In addition, internet connection technologies and decision support tools are beneficial to all farmers whether they are users or not. Since, thanks to their proximity, they manage to capture more agglomeration advantage. Also, it was found that there is a rebound effect as to the impact of these technologies on the manure production. The contributions of the thesis are that, first of all, it represents the first estimations, to our knowledge, of impacts of digital technologies on a farm on a national scale. Indeed, the data still very recent, matching multiple sources was our first challenge. As well, our estimation methods, namely the Two-Stage least square (2SRI) and the Coarsening Exact Matching (CEM), are new approaches and have more relevant results especially in our context of cross-sectional data with endogeneity. Finally, the last contribution is to make recommendations to enable public policies to understand the effects of new technologies and promote the best of them
APA, Harvard, Vancouver, ISO, and other styles
3

Dumas, feris Barbara Pilar. "Réseaux optiques en mode paquet pour les connexions internes à un centre de données." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0057/document.

Full text
Abstract:
La consommation d'énergie des centres de données est un enjeu majeur. Leurs communications internes représentent près du quart de cette consommation. Les technologies de commutation optique ont en principe une meilleure efficacité énergétique que les solutions actuelles. Ce travail porte sur les réseaux optiques en mode paquet pour des centres de données de petite et moyenne taille. Il s'est déroulé dans le cadre du projet EPOC (Energy Proportional and Opportunistic Computing) qui s'intéresse à la réduction de la consommation d'énergie d'un centre de données alimenté partiellement par des sources renouvelables. Une hypothèse clé est l'absence d'un réseau de stockage dédié réduisant ainsi la consommation des interconnexions. Par contre, afin de pouvoir éteindre certains serveurs selon la charge de travail et l'énergie disponible, le débit doit être de l'ordre de 100 Gbit/s. Après un état de l'art des réseaux optiques pour centre de données nous choisissons une solution reposant sur une infrastructure entièrement passive et des émetteurs rapidement accordables en longueur d'onde, proposée récemment dans la littérature (POPI).Nous étudions les limitations dues aux composants (pertes d'insertion, plage d'accord et espacement des canaux). Nous proposons une extension (E-POPI) qui permet d'augmenter le nombre de serveurs connectés en utilisant plusieurs plages de longueurs d'onde. Pour les centres de données de plus grande taille nous proposons un réseau à deux étages (intra- et inter-racks) opérant respectivement dans les bandes C et L, POPI+. La connexion entre étages se fait via une passerelle transparente dans un sens et opaque dans l'autre. Différentes solutions de contrôle des deux étages sont détaillées.Un des éléments essentiels de faisabilité de ces architectures est de concilier la montée en débit avec les pertes du réseau passif d'interconnexion. Les techniques cohérentes des transmissions longue distance ne sont pas actuellement envisageables pour un centre de données. Nous avons donc étudié les formats PAM 4 et 8, par simulation avec différents débits (jusqu'à 112 Gbit/s et récepteurs (PIN, APD et SOA-PIN) et aussi, expérimentalement, à 12 et 18 Gbit/s. Nous avons développé une méthode de compensation des distorsions générées par les différents composants qui procure un compromis entre précision de correction et temps de calcul.Ces résultats nous permettent de déterminer les pertes d'insertion tolérables. Nous les combinons avec les limitations liées à la plage d'accord des émetteurs et à l'encombrement spectral des canaux occupant des fenêtres multiples de 12,5 GHz pour dimensionner les différentes architectures. Les réseaux POPI, E-POPI et POPI+ permettent respectivement la connexion de 48, 99 et 2352 entités à 112 Gbit/s. Nos évaluations tiennent compte d'une possible dispersion des caractéristiques des principaux composants
Data-center energy consumption is nowadays a major issue. Intra-data-center networking accounts almost for a quarter of the data-center total power consumption. Optical switching technologies could provide higher power efficiency than current solutions based on electrical-packet switching. This work focuses on optical-packet-switched networks for small- and medium-size data centers. It takes part of the EPOC (Energy-Proportional and Opportunistic Computing) project, which main interest consists on reducing the overall power consumption of a data center partially powered by renewable sources. A key assumption is that our data center does not rely on a dedicated storage network, in order to reduce the consumption of those interconnections. In addition, with the aim of being able to turn off some servers according to the workload and the available energy, the bit rate must be close to 100 Gbit/s. We have chosen, after studying the state of the art of data-center interconnects, a purely passive network architecture based on fast-wavelength-tunable transmitters under the name of POPI.We study POPI's limitations due to its components (insertion loss, tuning range and channel spacing). We then propose an extension called E-POPI that allows to increase the number of connected servers by using several transmission bands. For larger data centers, we propose POPI+, a two-stage infrastructure for intra- and inter-rack communications operating in the C and L bands, respectively. The connection between both stages is done via a transparent gateway in one direction and an opaque one in the other. We discuss different control solutions for both stages.The feasibility of these architectures depends on, among other factors, dealing with bit-rate increasing and power losses of a passive interconnect. Coherent long-distance-transmission techniques are not currently suited to data centers. We therefore studied PAM 4 and 8 modulation formats with direct detection. On one hand, by simulation, with different bit rates (up to 112 Gbit/s) and receivers (PIN, APD and SOA-PIN) and, on the other hand, experimentally, at 12 and 18 Gbit/s. We have developed a method for compensating the distortions generated by the different network components. Our method takes into account a good tradeoff between correction accuracy and computation time.Simulation results allow us to determine the amount of insertion loss that may be supported. We then combine these results with the limitations of transmitters-tuning range and channel spacing using multiple of 12.5 GHz slots for dimensioning the proposed architectures. POPI, E-POPI and POPI+ interconnects allow the connection of 48, 99 and 2352 entities, respectively, at 112 Gbit/s. Our assessments take into account a potential dispersion of the characteristics of the main architecture components
APA, Harvard, Vancouver, ISO, and other styles
4

Razafimandimby, Anjalalaina Jean Cristanel. "Toward internet of heterogeneous things : wireless communication maintenance and efficient data sharing among devices." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10074/document.

Full text
Abstract:
Malgré le grand succès de l'Internet des Objets, la plupart de ses applications sont basées uniquement sur l'actionnement statique. Cependant, l'ajout d'un rôle actif pour les actionneurs sera nécessaire afin d'optimiser les systèmes où ils sont présents. Pour ce faire, dans cette thèse, nous introduisons un nouveau concept appelé Internet des Objets Hétérogènes qui prend en compte les actionnements statique et dynamique. L'actionnement dynamique est fourni par un robot mobile ou un capteur mobile. Dans ce cas, nous exploitons le potentiel de la mobilité contrôlée en proposant des algorithmes efficaces pour maintenir la connectivité entre les dispositifs. Nous montrons par simulation l'efficacité des algorithmes proposés et leur performance en termes de temps de convergence, de connectivité et de distance parcourue. Une fois que la connectivité entre les dispositifs est garantie, un autre défi majeur qui devrait être résolu est l'énorme quantité de données qu'ils génèrent. Pour faire face à ce problème, nous proposons une approche d'inférence bayésienne qui permet d'éviter la transmission des données fortement corrélées. L'algorithme de propagation de croyance, couplé au modèle de champ aléatoire de Markov, est utilisé dans ce cas pour inférer les données manquantes. Selon différents scénarios, notre approche est évaluée sur la base des données réelles recueillies à partir des capteurs déployés sur des environnements intérieurs et extérieurs. Les résultats montrent que notre approche réduit considérablement la quantité de données transmises et la consommation d'énergie, tout en maintenant un niveau acceptable d'erreur d'inférence et de qualité de l'information
Despite of the large success of IOT, most of its applications are based only on static actuation. However, adding an active role for actuators will be needed, in order to optimize the systems where they are present. To achieve this goal, in this thesis, we introduce a new concept called Internet of Heterogeneous Things which takes into account both static and dynamic actuation. The dynamic actuation is provided by a mobile robot or a mobile sensor. In this case, we exploit the potential of controlled mobility by proposing efficient algorithms to maintain the global connectivity among devices. We show by simulation the efficiency of the proposed algorithms and their performance in terms of convergence time, connectivity, and traveled distance. Once the connectivity among devices is guaranteed, another major challenge that should be solved is the huge amount of data they generate and transmit. To tackle this problem, we propose a Bayesian Inference Approach which allows avoiding the transmission of high correlated data. Belief Propagation algorithm, coupled with the Markov Random Field model, is used in this case to reconstruct the missing sensing data. According to different scenarios, our approach is evaluated based on the real data collected from sensors deployed on indoor and outdoor environments. The results show that our proposed approach reduces drastically the number of transmitted data and the energy consumption, while maintaining an acceptable level of inference error and information quality
APA, Harvard, Vancouver, ISO, and other styles
5

Fàbrega, i. Soler Lluís. "Admission control schemes for TCP elastic traffic in class-based networks." Doctoral thesis, Universitat de Girona, 2008. http://hdl.handle.net/10803/7604.

Full text
Abstract:
En aquesta tesi proposem dos esquemes de xarxa amb control d'admissió per al trànsit elàstic TCP amb mecanismes senzills. Ambdós esquemes són capaços de proporcionar throughputs diferents i aïllament entre fluxos, on un "flux" es defineix com una seqüència de paquets relacionats dins d'una connexió TCP. Quant a l'arquitectura, ambdós fan servir classes de paquets amb diferents prioritats de descart, i un control d'admissió implícit, edge-to-edge i basat en mesures. En el primer esquema, les mesures són per flux, mentre que en el segon, les mesures són per agregat. El primer esquema aconsegueix un bon rendiment fent servir una modificació especial de les fonts TCP, mentre que el segon aconsegueix un bon rendiment amb fonts TCP estàndard. Ambdós esquemes han estat avaluats satisfactòriament a través de simulació en diferents topologies de xarxa i càrregues de trànsit.
In this thesis we propose two network schemes with admission control for TCP elastic traffic using simple mechanisms. Both schemes are able to provide different throughputs and isolation between flows, where a flow is defined as a sequence of related packets within a TCP connection. Regarding to the architecture, both use packet classes with different discarding priorities and an admission control that is implicit, edge-to-edge and based on measurements. In the first scheme, measurements are per-flow, while in the second one, measurements are per-aggregate. The first scheme achieves a good performance using a special modification of TCP sources, while the second scheme achieves a good performance with standard TCP sources. Both schemes have been evauated succesfully through simulation in different network topologies and traffic loads.
APA, Harvard, Vancouver, ISO, and other styles
6

Ammar, Doreid. "Plan de connaissance pour les réseaux sémantiques : application au contrôle d'admission." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00850153.

Full text
Abstract:
Depuis quelques années, il y a un réel changement dans les usages des réseaux en termes d'applications véhiculées ainsi que dans leur nombre. On voit apparaître de plus en plus d'applications contraintes en termes de délai, comme par exemple la téléphonie sur IP, ainsi que d'applications gourmandes en ressources comme par exemple le Srteaming Video. La croissance en volume de ces applications copmmence à poser des problèmes de congestion dasn les réseaux filiares et sans fil. Les opérateurs réseaux doivent être capables d'absorber ces changements de trafic, de faire face à cette demande de plus en plus intensive en bande passante et de fournir une bonne qualité (QoS) aux applications. Cela nécessite des mécanismes intellignets en termes d'ordonnancement et de gestion des files d'attente, de contrôle d'admission, de contrôle de débit et/ou de routage. L'objectif initial de cette thèse étati d'aboutir à la conception d'une nouvelle architecture de traitement et de gestion du trafic et de la qualité de service pour le contrôle d'admission. Plus précisément nous présentons une nouvelle solution pour le contrôle d'admission qui repose sur l'élaboration en continu d'un plan de connaissance et sur la modélisatio automatique du comportement d'un lien réseau par une file d'attente monoserveur. Norte solution doit permettre d'offrir une garantie probabiliste d'un paramètre de performance QoS qui peut être le délai d'attente moyen des paquets dans le buffer du lien ou le taux de perte. Nous avons évalué les performances de notre nouveau contro^le d'admission par simulation en considérant diverses conditions possibles de trafic. Lers résultats obtenus indiquent que la solution proposée permet d'atteindre un contrôle d'admission ni trop conservateur, ni trop permissif. En outre, notre solution offre l'avantage de se baser uniquement sur une connaisssance acquise au cours du temps et permet ainsi de s'affranchir d'un paramétrage compliqué des paramètres comme c'est le cas pour les solutions classiques de contrôle d'admission
APA, Harvard, Vancouver, ISO, and other styles
7

Wlazlak, Anne. "L'influence de la construction communautaire sur la constitution française." Phd thesis, Université d'Avignon, 2013. http://tel.archives-ouvertes.fr/tel-01059135.

Full text
Abstract:
La Constitution, entendue dans son acception la plus générale comme La marque suprême de souveraineté nationale, ne cesse d'évoluer au fil de l'approfondissement de la construction européenne. Un tel constat se manifeste à la fois dans le contenu matériel et normatif de la norme première, dans son aspect purement formel et dans son essence même. Pour s'en convaincre, il suffit de se reporter aux nombreuses révisions constitutionnelles ayant été effectuées sous la pression de l'intégration européenne. La doctrine évoque une communautarisation des Constitutions nationales voire une constitutionnalisation du droit communautaire. Dans cette optique, il convient de s'interroger, par le biais d'une démarche comparatiste évolutive, sur la portée effective et sur les conséquences de ces évolutions sur les contours et l'acception de la Constitution française.Est­-il encore possible d'évoquer un monopole de souveraineté pour caractériser cette dernière, face à l'exercice par l'Union européenne de la souveraineté transférée ? Est-­il réellement légitime, et juridiquement juste, de continuer à appréhender la Constitution à partir de son cadre national d'origine ? En d'autres termes, et d'une manière plus radicale, le concept de Constitution peut‐il encore être rattaché à un sens traditionnel et exclusif, tel qu'issu du droit interne? Face aux incertitudes européennes dont la norme suprême fait désormais l'objet, force est de dépasser le cadre d'étude fondamental traditionnel par la construction d'un nouveau concept de "Constitution", supplantant les principales définitions jusqu'ici admises.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Connexion internet"

1

Guinchard, Serge. Internet pour le droit: Connexion, recherche, droit. Paris: Montchrestien, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Internet and Intranet security. 2nd ed. Boston, MA: Artech House, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Oppliger, Rolf. Internet and Intranet security. Boston: Artech House, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Cybersexe: Les connexions dangereuses. [Paris]: Arléa, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Caccia, Fulvio. Cybersexe: Les connexions dangereuses. Cap-Saint-Ignace, Qué: Boréal, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Oppliger, Rolf. Internet & Intranet Security. 2nd ed. Artech House Publishers, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Rivers, Isabel. North American Connexions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198269960.003.0008.

Full text
Abstract:
This chapter begins by illustrating the importance of the transatlantic trade in religious books, the relations between English, Scottish, and North American readers, correspondents, and book donors, and the British interest in the New England revivals. The main focus is the editing, publishing, and interpreting in England and Scotland of the Americans Jonathan Edwards and David Brainerd. Editions and abridgements were made by Isaac Watts, John Guyse, Joseph Williams, John Erskine, William Gordon, John Wesley, John Styles, Josiah Pratt, and James Montgomery. The theological and other differences between the rival editions are clearly set out, and their reception by Methodists, Congregationalists, Baptists, Scottish Presbyterians, and Church of England evangelicals is explored.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Connexion internet"

1

Whitley, James. "Regions within Regions." In The Early Greek Alphabets, 223–48. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198859949.003.0010.

Full text
Abstract:
Archaic Crete has always provided a useful counterweight to Athenocentric views of how early Greece developed. This paper's focus is on Crete's epigraphic habits. It proposes that there is a deep-seated connexion between these and other features of its material culture-its austerity, and apparent lack of interest in narrative art. It goes on to compare epigraphic habits in Western, Central, and Eastern Crete. It concentrates on inscriptions from the three known Archaic political communities in Eastern Crete: Azoria, Praisos, and Itanos. They differ as much from each other as they do from the pattern to be found in Central Crete. Insofar as there is an East Cretan pattern, however, it seems in part to relate to a greater interest in figurative art than was the case in Central Crete. Whether this relates to linguistic differences, which seemed to have required modifications to the Cretan epichoric script, is also discussed.
APA, Harvard, Vancouver, ISO, and other styles
2

Millican, Peter. "Hume on Causation and Causal Powers." In Reconsidering Causal Powers, 206–40. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198869528.003.0010.

Full text
Abstract:
Peter Millican addresses the issue of how to best interpret Hume’s iconic passages on causation and causal powers and aims to cut through the various interpretations by fixing twelve ‘key points’ and arguing that a reductivist reading makes best sense of them. With these twelve points regarding Hume’s theory fixed, Millican turns toward adjudicating between reductivist, subjectivist, and projectivist interpretations. First, Millican attacks subjectivist interpretations on the grounds that they emphasize melodramatic passages in tension with Hume’s more considered claims, especially the first definition of necessity. Millican backs up the critical comments about subjectivism with a plausibly Humean account of what his ‘impression of power or necessary connexion’ might be. Then he turns to projectivist interpretations. Here, he argues that projectivist readings can be accommodated by the reductivist reading he is defending. After that, he turns to the ‘New Hume’, who allegedly accepted ‘thick’ causal powers, which push beyond the two definitions of cause. However, Millican emphasizes that Hume did accept causal powers in some thinner sense, powers that reduce to causal structures in the world that allow the discovery of laws and enable predictive success.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Connexion internet"

1

Donat Accrombessy, Félicien. "Information and Communication Technology and the development of statistics teaching in Benin: Advantages and inconvenient." In Statistics and the Internet. International Association for Statistical Education, 2003. http://dx.doi.org/10.52041/srap.03301.

Full text
Abstract:
Some changes occur in world at the aegis of the 21st century like a revolution marked by the rapid and extraordinary expansion of Information and Communication Technologies (ICT). This kind of revolution, by its velocity of propagation has hugely contributed to the growth productivity. Then, internet and multimedia appear as essential tools to the socio- economic development of any modern nation. In the current context of globalisation supervised by the developed countries with United States as pioneers it is greatly important to measure ICT’s use, particularly in the education and training fields. Then, the necessity to measure the use of internet resources in the specific field of statistics teaching according to the available means and technology appears as a basic need researchers, decision makers, students, etc. After that, some propositions should be give in order to improve the current situation. First of all, it is suitable to describe briefly the Benin Republic. With a population 6.7 millions of people in 2003 according to the february General Census (4.2 millions in 1992, march General Rensus), Benin is an west Africa country with a geographic surface of 114,760 Km2. The density of the population is 58.38 people on the Km2. Benin is an agricultural developing country as agriculture represents 40% of the Gross Domestic Product and uses about 80% of the population. Even if ICT appear soon in the years 70’s, Africa got in contact with it in the 90’s particularly concerning the internet and its resources. In sub-saharan Africa, Benin was one of the first countries to hear about and to practice the World Wide Web. It was in 1995 at the occasion of the international summit of the French language speaking countries held in Cotonou in December with an internet centre inaugurated at the Benin National University, the most important university of the country: it was the SYFED center. This Center, with documentation and some five personal computers connected to the World Wide Web, was opened to students in 3rd or 4th course, to teachers and researchers. But this proportion of users is less than 2% of the students and the accessibility costs were very expensive: FCFA 1,500 each month or FF 15/month for students and FCFA 7,500 each 3 months or FF 75 each 3 months for teachers and researchers. Progressively, the national postal office has agreed some few Internet Service Providers (after the french speaking language summit in 1995). Since then, the internet environment of Benin is constituted of ISP and cyber cafés. The seconds depends on the firsts. Nowadays the great cities of the country, especially the economic capital of Cotonou are swarming cybers. The cybers are connected with the ISP (in fact, some of the ISP have their own cybers) that have direct connexion with internet. Currently the navigation costs are cheaper. Then, from FF 15 or FF 30 by hour of connexion, the mean costs are today between FF 3 to FF 5. Nowadays, internet resources are hugely taking part to any field of human life and particularly in education. In 1999, with the help of the partners in development and on the initiative High Education Ministry, a Distance learning Centre (CED) has been founded to provide training courses at a various public. This centre offers teaching by specialists all around the world in several fields from economics, technology to development subjects. But unfortunately, nothing is really done to adapt appropriate curricula related to the availability of Information and Communication Technology resources in universities and schools.
APA, Harvard, Vancouver, ISO, and other styles
2

Weinbaum, Sheldon. "Mechano/Transduction, Cellular Communication and Fluid Flow in Tissue Engineering." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2511.

Full text
Abstract:
Abstract The growth of cellular constructs in tissue scaffolds depends on the delivery of nutrients and growth factors as well as the substrate on which they are grown. Micropatterning techniques have also made it possible to grow cells on a wide variety of substrates with greatly different topography which significantly alter cellular contact and communication. Fluid flow is critical not only in this delivery of nutrients and growth factors, but also in the interaction of the cell’s cytoskeleton with its attachment matrix. Similarly, fluid flow is known to play an important role in cell to cell communication via its regulatory effect on various gap junction proteins of the connexon family. The mechano/transduction and cell to cell signaling mechanisms will be examined for both cells with a smooth topography, such as vascular endothelium cells which are involved in angiogenesis and cells with cell processes and microvilli whose tethering attachments and protrusions interact with fluid flow in a different manner.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography