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Artykuły w czasopismach na temat "Contrôler la congestion"
Chatté, Fabien, i Bertrand Ducourthial. "Contrôle de congestion dans les protocoles de transport internet. Etat de l'art et perspectives". Techniques et sciences informatiques 23, nr 8 (1.09.2004): 1057–84. http://dx.doi.org/10.3166/tsi.23.1057-1084.
Pełny tekst źródłaMerzouki, Wissem, Saida Khouni, Ali Benazza, Omar Bafdel, Aissa Hadj Brahim, Sihem Guerfi i Hachani Khadraoui. "Colic endometriosis: report of 2 cases". Batna Journal of Medical Sciences (BJMS) 2, nr 1 (30.06.2015): 85–88. http://dx.doi.org/10.48087/bjmscr.2015.2120.
Pełny tekst źródłaCollin, Floriane. "Un cas de péricardite hémorragique aseptique idiopathique chez une vache Prim’Holstein de 3 ans". Le Nouveau Praticien Vétérinaire élevages & santé 15, nr 52 (2023): 40–49. http://dx.doi.org/10.1051/npvelsa/2023021.
Pełny tekst źródłaPapon, Francis. "Analytical Expression of Social Costs Produced on Urban Streets". Les Cahiers Scientifiques du Transport - Scientific Papers in Transportation 24 | 1991 (30.11.1991). http://dx.doi.org/10.46298/cst.11898.
Pełny tekst źródłaWilson, Ben, i Duane Bates. "Diuretic Strategies in Acute Decompensated Heart Failure: A Narrative Review". Canadian Journal of Hospital Pharmacy, 13.12.2023, 1–14. http://dx.doi.org/10.4212/cjhp.3323.
Pełny tekst źródłaRozprawy doktorskie na temat "Contrôler la congestion"
Makarem, Nabil. "Performance evaluation and improvement of congestion control of the constrained application protocol for the Internet-of-things". Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS289.
Pełny tekst źródłaThe Constrained Application Protocol (CoAP) is a lightweight core protocol designed by the Internet Engineering Task Force (IETF) used for communication between devices in the Internet of Things (IoT). In this research work, we propose new exact mathematical models to analyze the performance of CoAP in lossy IoT networks. This study provides insights about improving CoAP congestion control in such networks and highlights the properties -- including the limitations -- of CoAP. Besides, we show that the simple control mechanism reduces significantly CoAP performance especially in terms of bandwidth utilization since it prevents the protocol from acting efficiently during congestion periods. We then propose new improvements in order to enhance the trade-off between reliability and goodput while keeping the algorithms reasonably simple for constrained devices. First, we optimize further the estimation procedure of the retransmission timeout in order to enhance congestion detection. Timeouts are the only indicator used in CoAP to detect losses, and losses are used as a strong indicator to detect congestion. Second, we replace the backoff algorithm by "real" congestion control algorithms inspired from the well-known Additive Increase Multiplicative Decrease technique and a recent measurement-based congestion control called BBR. Our analysis using both our simulator and Contiki/Cooja environment show that the rate-based approach outperforms the backoff-based approach. Moreover, all the results show that our algorithms achieve a much better tradeoff between goodput, reliability and overhead
Stanica, Razvan. "Contrôle de Congestion dans les Réseaux Véhiculaires". Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0130/document.
Pełny tekst źródłaThe equipment of vehicles with wireless communication devices in order to improve road safety is a major component of a future intelligent transportation system. The success and availability of IEEE 802.11-based products make this technology the main competitor for the Medium Access Control (MAC) layer used in vehicle-to-vehicle communication. The IEEE 802.11p amendment has been specially designed in this special context of wireless access in vehicular environments. However, as all the other approaches based on Carrier Sense Multiple Access (CSMA), this protocol presents scalability problems, which leads to poor performance in high density scenarios, quite frequent in the case of a vehicular ad hoc network (VANET). This thesis studies the congestion control problem in the context of safety vehicular communications, with a special focus on the back-off mechanism and the carrier sense function. First of all, a number of important characteristics presented by the safety messages are discovered and understood by the means of an analytical framework. Second, the lessons learned from the analytical study are put into practice with the design of two adaptive mechanisms (one for the contention window and the other one for the carrier sense threshold) that take into account the local vehicular density. These mechanisms remain simple, but highly efficient, while also being straightforward to integrate in IEEE 802.11 devices. Finally, by taking into account the most important properties of a safety VANET, a new CSMA-based MAC protocol is proposed. This new access method, named Safety Range CSMA (SR-CSMA), relies on the idea that collisions can not be avoided in a high density network. However, by increasing the number of simultaneous transmissions between geographically distant nodes, SR-CSMA manages to better protect the immediate neighborhood, the most important area for safety applications
Rozhnova, Natalya. "Congestion control for Content-Centric Networking". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066132/document.
Pełny tekst źródłaThe network resources are shared between a large number of users. It may potentially create a risk for buffer overflow and performance degradation. That is why congestion control is critical to guarantee network performance. Congestion control schemes have been widely studied in the past but only recently in the context of CCN (Content-Centric Networking).This thesis explores the congestion control risk of CCN, identifies the bottlenecks and proposes strategies to circumvent them. We have designed our original hop-by-hop Interest shaping mechanism (HoBHIS) that nicely exploits the flow balance enforced in CCN between Interest and Chunk packets. It monitors active conversations sharing the transmission buffer of a CCN node face in order to dynamically adjust their Interest sending rate and enforce the Chunk queue length to converge to a defined objective. This mechanism is implemented in each CCN node. Then, we extended HoBHIS in order to address several important concerns that might occur in CCN. We proposed a Tolerance mechanism that controls the Clients sending rate as well as prevents the loss of Interest packets. We demonstrated the efficiency of our mechanisms through mathematical proofs and simulations performed in ndnSIM.Our results have been published in international conferences. The work has generated interest from the networking community. Particularly, "Cisco Systems" invited us to join their project on developing Named-Data Networking (NDN) traffic control mechanism. As one of the important results of this collaboration is a research article that got a SIGCOMM ICN workshop’13 “Best paper award”. This paper is also presented as a part of the dissertation
Rozhnova, Natalya. "Congestion control for Content-Centric Networking". Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066132.
Pełny tekst źródłaThe network resources are shared between a large number of users. It may potentially create a risk for buffer overflow and performance degradation. That is why congestion control is critical to guarantee network performance. Congestion control schemes have been widely studied in the past but only recently in the context of CCN (Content-Centric Networking).This thesis explores the congestion control risk of CCN, identifies the bottlenecks and proposes strategies to circumvent them. We have designed our original hop-by-hop Interest shaping mechanism (HoBHIS) that nicely exploits the flow balance enforced in CCN between Interest and Chunk packets. It monitors active conversations sharing the transmission buffer of a CCN node face in order to dynamically adjust their Interest sending rate and enforce the Chunk queue length to converge to a defined objective. This mechanism is implemented in each CCN node. Then, we extended HoBHIS in order to address several important concerns that might occur in CCN. We proposed a Tolerance mechanism that controls the Clients sending rate as well as prevents the loss of Interest packets. We demonstrated the efficiency of our mechanisms through mathematical proofs and simulations performed in ndnSIM.Our results have been published in international conferences. The work has generated interest from the networking community. Particularly, "Cisco Systems" invited us to join their project on developing Named-Data Networking (NDN) traffic control mechanism. As one of the important results of this collaboration is a research article that got a SIGCOMM ICN workshop’13 “Best paper award”. This paper is also presented as a part of the dissertation
Barakat, Chadi. "Evaluation des performances du contrôle de congestion dans l'Internet". Nice, 2001. http://www.theses.fr/2001NICE5622.
Pełny tekst źródłaWe study in this thesis the performance of the congestion control mechanisms of the TCP protocol. These mechanisms are very important for the stability of the Internet given the huge amount of the TCP traffic. For the purpose of our study we develop some analytical models. Our models are divided into two main groups : the end-to-end models and the network-specific models. The objective of the end-to-end models is to come up with simple expressions of the throughput of a long-life TCP connection. We try to keep our models as general as possible so that they cover the different ways with which the network drops the packets of the TCP connection. Using techniques from the theory of stochastic processes, we find explicit expressions for TCP throughput that we validate via measurements over the Internet. Concerning the network-specific models, our objective is to study the performance of TCP in challenging environments. We focus on the three environments considered in the literature as the most challenging for TCP : the large bandwidth-delay product environment, the asymmetric-bandwidth environment, and the wireless environment. For each environment, we propose an analytical model as well as some mechanisms and guidelines to improve the performance of TCP transfers. The different results of our second group of models are validated via ns simulations. The thesis also contains a presentation of the different works on TCP congestion control mechanisms since their introduction into the internet
Legout, Arnaud. "Contrôle de congestion multipoint pour les réseaux best effort". Nice, 2000. http://www.theses.fr/2000NICE5451.
Pełny tekst źródłaLenoir, Nathalie. "Une approche economique de la congestion aerienne". Toulouse 1, 1995. http://www.theses.fr/1995TOU10012.
Pełny tekst źródłaOur work takes place in the context of a general body of work conducted on airline liberalization in europe. Some aspects of the liberalization policy, like the free acces to the market for all airlines, and the possibility of competition on short and medium haul flights are jeopardized by the limits on the infrastructure's capacities. The aeronautic infrastructure consists of the airports and the air trafic control system. In europe, they are both becoming rapidly congested, with no short term solution to the problem. Therefore, it is important to optimize the way the existing capactties are used. Since those capacities are managed in a monopolistic fashion, and are subjected to very high peak demands, in the first part we examine the economic theories relevant to regulation and peak load pricing. In the second part, we study the allocation of airport capacity. Although we mention the possibility of peak load pricing, we focus more specifically on the allocation through airport, which are the chosen solution in the usa and in europe. After reviewing the americain experience with slots, we concentrate on the europeen case and conclude by emphasizing the difficulty of restoring the social optimum. In the third part, we deal with the air trafic control, and review the caracteristics of supply and demand. An analysis of traffic in france shows that the role of small aviation is generally under-estimated. Also, a study of current taxes shows that they have a negative impact on congestion, resulting in delays, which we then estimate with econometric techniques. Finally, several economic solutions to the congestion problem are mentioned and evaluated. Peak load pricing is an awkward solution because of the geographic dimension of flights. We recommend instead a priority pricing system
Dracinschi, Anca. "Contrôle de congestion dans Internet : un mécanisme unifié pour prévenir la congestion des flots unicast et multicast". Paris 6, 2000. http://www.theses.fr/2000PA066145.
Pełny tekst źródłaSanhaji, Ali. "Nouveaux paradigmes de contrôle de congestion dans un réseau d'opérateur". Phd thesis, Toulouse, INPT, 2016. http://oatao.univ-toulouse.fr/17304/1/sanhaji.pdf.
Pełny tekst źródłaChatté, Fabien. "Contribution au contrôle de congestion dans les protocoles de transport". Compiègne, 2004. http://www.theses.fr/2004COMP1514.
Pełny tekst źródłaLn this PhD thesis manuscript, we begin by presenting a panorama of different congestion control techniques implemented in unicast transport protocols. Next, we present a study in which we try to define the validity limits of the fluid approximation of a packets switched network. After, we describe and justify the development (in the continuous time domain) of a controller, which is used to compensate the sending rate of network sources in order to avoid congestions. Once the controller developed, we discretize it in order to implement it in a transport protocol. To objectively compare our congestion control mechanism to the existing ones, we define a comparison methodology. This methodology allows to evaluate performance of congestion control mechanisms. At the end, we compare the performance of our protocol with those of several existing transport protocols. This comparison allows us to analyse in several cases, the behaviour of the tested protocols
Części książek na temat "Contrôler la congestion"
HADJADJ-AOUL, Yassine, i Soraya AIT-CHELLOUCHE. "Utilisation de l’apprentissage par renforcement pour la gestion des accès massifs dans les réseaux NB-IoT". W La gestion et le contrôle intelligents des performances et de la sécurité dans l’IoT, 27–55. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9053.ch2.
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