Dissertations / Theses on the topic 'Routage efficace'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 25 dissertations / theses for your research on the topic 'Routage efficace.'
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.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Kirchler, Dominik. "Routage efficace sur réseaux de transport multimodaux." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00877450.
Full textAudeoud, Henry-Joseph. "Routage efficace et garanti dans les réseaux de capteurs sans fil." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAM055.
Full textThe wireless sensor networks that we work with in this thesis are a set of devices connected to eachother by low-rate and low-power technologies. Their role is to produce measures on the physical environ-ment around them (meteorological and climate condition tracking, monitoring of industrial installations,control of distribution grids, topographical surveillance. . . ). These measures must then be collected out ofthe network. Since the sensors have short range radios, transmissions are multi-hop, the sensors close tothe destination relaying the information transmitted by those which are further away from it. Because ofthe movement of the nodes themselves or of objects in their environment interfering with wireless commu-nications, the exact topology of the network is subject to change. In addition, the battery-powered sensorsare limited in energy and therefore in transmission abilities. The power-saving techniques applied to turnoff the radio most of the time impose synchronization constraints.To route information through the network, the routing protocol establishes routes, so that the sensorscan relay information from and to the network border router through reliable links leading to the destina-tion through short paths. Due to sensor limitations, the routing must be energy efficient, i.e. the overloadof the radio transmissions involved by the routing algorithm itself must be as lightweight as possible. Itmust also be able to restore connectivity on a network topology change without creating routing loops thatnegatively impact the quality of service and the energy reserves of the nodes.This document describes a routing protocol that meets these objectives. It is capable of creating a self-healing collection tree that extracts information out of the network, as well as from the routes to distributecommand messages or acknowledgment to the nodes. It also validates the data path of each packet toensure that they never enter a routing loop. The protocol is run in simulations and also on real platformexperiments, showing the effectiveness of the proposed mechanisms.In order to improve its ability to choose the best available links, I also propose the use of a new esti-mation of their quality. It is based on two complementary measurements: a long-term measurement ofthe ambient noise level on the radio channel, and a measurement of the power of the signal received fromthe transmitter. These two measurements provide an estimate of the signal-to-noise ratio, and thereby theexpected reception rate. This estimate is both accurate, quick to obtain, and adapted to the constraints ofsensors and networks we are talking about
Fotue, Fotso David Bertrand. "Agrégation et routage efficace de données dans les réseaux de capteurs sans fils." Thesis, Paris, ENST, 2013. http://www.theses.fr/2013ENST0066/document.
Full textWireless Sensor Networks (WSNs) have gained much attention in a large range of technical fields such as industrial, military, environmental monitoring etc. Sensors are powered by batteries, which are not easy to replace in harsh environments. The energy stored by each sensor is the greatest impediment for increasing WSN lifetime. Since data transmission consumes more energy, our major concern is how to efficiently transmit the data from all sensors towards a sink. We suggest three tree-based data aggregation algorithms: Depth-First Search Aggregation (DFSA), Flooding Aggregation (FA) and Well-Connected Dominating Set Aggregation (WCDSA) to reduce the number of transmissions from each sensor towards the sink. Tree-based data aggregation suffers from increased data delivery time because the parents must wait for the data from their leaves. Some parents might have many leaves, making it very expensive for a parent to store all incoming data in its buffer. We need to determine the aggregation time each parent in the tree has to spend in aggregating and processing the data from its leaves. We propose an Efficient Tree-based Aggregation and Processing Time (ETAPT) algorithm using Appropriate Data Aggregation and Processing Time (ADAPT) metric. Given the maximum acceptable latency, ETAPT's algorithm takes into account the position of parents, their number of leaves and the depth of the tree, in order to compute an optimal ADAPT time. At any time, the amount of data aggregated by parents may become greater than the amount of data that can be forwarded. We propose the introduction into the network of many data aggregators called Mini-Sinks (MSs). MSs are mobile and move according to a random mobility model inside the sensor field to maintain the fully-connected network in order to aggregate the data based on the controlled Multipath Energy Conserving Routing Protocol (MECRP). Sensors may use many radio interfaces sharing a single wireless channel, which they may use to communicate with several neighbours. Two sensors operating on the same wireless channel may interfere with each other during the transmission of data. We need to know which channel to use in the presence of multiple channels for a given transmission. We propose a distributed Well-Connected Dominating Set Channel Assignment (WCDS-CA) approach, in which the number of channels that are needed over all sensor nodes in the network in such a way that adjacent sensor nodes are assigned to distinct channels
Mazauric, Dorian. "Optimisation discrète dans les réseaux de télécommunication : reconfiguration du routage, routage efficace en énergie, ordonnancement de liens et placement de données." Phd thesis, Université de Nice Sophia-Antipolis, 2011. http://tel.archives-ouvertes.fr/tel-00643513.
Full textFayçal, Marguerite. "Routage Efficace pour les Réseaux Pair-à-Pair utilisant des Tables de Hachage Distribuées." Phd thesis, Télécom ParisTech, 2010. http://pastel.archives-ouvertes.fr/pastel-00521935.
Full textDelahaye, Ruddy. "Simulation réaliste et efficace de la couche physique pour l'aide au routage des réseaux "ad hoc"." Poitiers, 2007. http://www.theses.fr/2007POIT2273.
Full textThis PhD research focuses on the simulation of ad hoc networks physical layer. More precisely, the aim of the work is to develop a realistic modelling of this layer usable by the current simulation platform. In the first chapter, we present the ad hoc networks concept and a state of art of the physical layer models and we describe their advantages and drawbacks. Then, the second chapter introduce the radio propagation channel, which characterize wireless communication physical layer systems, and its existing modelling. Different comparative studies analyse this layer in the third chapter. These last ones were realized thanks to a physical layer simulator developed during this thesis. Thus, we have shown the interest of using a realistic propagation model such as 3D ray tracing method ; and also introducing the Bit Error Rate (BER) of each radio link to participate on the routing of information like the classical next-hop count of transmission delay criteria of the current protocols. In this dissertation, several computation time optimisations are proposed and presented in the fourth chapter. They allow to use our realistic model in simulation platform which offer the possibility of studying ad hoc networks. Finally, the last chapter develop the realised first works to integrate our realistic physical layer model in NS-2 (Network Simulator version 2), the most usable currently platform
Liu, Li. "Energy conservation in wireless sensor networks and related problems of graph theory." Paris 11, 2008. http://www.theses.fr/2008PA112223.
Full textThis thesis is divided into two major parts according to the research fields : the energy conservation problems in wireless sensor networks and the scheduling problems in grid computing systems. Chapter 1 introduces the emergence of wireless sensor networks and its characteristics according to which the new problems of wireless sensor networks arise compared with the traditional network and wireless networks. Chapter 2-4 present the problem of energy conservation with coverage. We address an application which monitors a set of targets with coverage. We address an application which monitors a set of targets with known locations by a set of sensor nodes in heterogeneous wireless sensor networks. For further studies, we consider this problem under some specific conditions. We consider the wireless sensor networks satisfying that each node monitors one target or just for connection. Furthermore, we continue this work and defines the working time of a node is exactly d times. In chapter 5, present the efficient data routing problem for mobile tracking wireless sensor networks. Another issue we study in this thesis is about scheduling problems in grid computing systems. In chapter 6, we introduce a new approach that is with respect to job parallelism for computational grid. Chapter 7, tries to give a new grid system model to guarantee the quality of a schedule. This chapter is supposed to solve the problem of how to allocate the resources optimally and adaptively in the dynamic, scalable and distribute-controlled grid environment
Theoleyre, Fabrice. "Accès au Médium et exploitation efficace des Réseaux Radio Multisaut." Habilitation à diriger des recherches, Université de Strasbourg, 2014. http://tel.archives-ouvertes.fr/tel-01057204.
Full textAlaoui, Fdili Othmane. "Optimisation multicritères de la qualité de service dans les réseaux de capteurs multimédia sans fil." Thesis, Valenciennes, 2015. http://www.theses.fr/2015VALE0016/document.
Full textThanks to the valuable advances in Micro Electro-Mechanical Systems coupled with their convergence to wireless communication systems, the Wireless Sensor Networks (WSN). In the WSN context, all the efforts are made in order to propose energy-efficient solutions. With the recent developments in CMOS technology, low-cost imaging sensors have been developed. As a result, a new derivative of the WSN, which is the Wireless Video Sensor Network (WVSN), has been proposed. The particularities of the video data as well as the inherent constraints of the nodes have introduced new challenges. In this thesis, we propose two cross-layer based solutions for video delivery over the WVSN. The first solution proposes a new energy efficient and adaptive video compression scheme dedicated to the WVSNs, based on the H.264/AVC video compression standard. The video stream is then handled by an enhanced version of MMSPEED protocol, that we propose and note EQBSA-MMSPEED. Performance evaluation shows that the lifetime of the network is extended by 33%, while improving the video quality of the received stream by 12%. In the second solution, we enrich our compression scheme with mathematical models to predict the energy consumption and the video distortion during the encoding and the transmission phases. The video stream is then handled by a novel energy efficient and improved reliability routing protocol, that we note ERMM. Compared to a basic approach, this solution is extending the network lifetime by 15%, while improving the quality of the received video stream by 35%
Huin, Nicolas. "Réseaux pilotés par logiciels efficaces en énergie." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4080/document.
Full textIn the recent years, the growth of the architecture of telecommunication networks has been quickly increasing to keep up with a booming traffic. Moreover, the energy consumption of these infrastructures is becoming a growing issue, both for its economic and ecological impact. Multiple approaches were proposed to reduce the networks' power consumption such as decreasing the number of active elements. Indeed, networks are designed to handle high traffic, e.g., during the day, but are over-provisioned during the night. In this thesis, we focus on disabling links and routers inside the network while keeping a valid routing. This approach is known as Energy Aware Routing (EAR). However current networks are not adapted to support the deployment of network-wide green policies due to their distributed management and the black-box nature of current network devices. The SDN and NFV paradigms bear the promise of bringing green policies to reality. The first one decouples the control and data plane and thus enable a centralized control of the network. The second one proposes to decouple the software and hardware of network functions and allows more flexibility in the creation and management of network services. In this thesis, we focus on the challenges brought by these two paradigms for the deployment of EAR policies. We dedicated the first two parts to the SDN paradigm. We first study the forwarding table size constraints due to an Increased complexity of rules. We then study the progressive deployment of SDN devices alongside legacy ones. We focus our attention on the NFV paradigm in the last part, and more particularly, we study the Service Function Chaining problem
Uznanski, Przemyslaw. "Large scale platform : Instantiable models and algorithmic design of communication schemes." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00878837.
Full textPhan, Truong Khoa. "Conception et gestion de réseaux efficaces en énergie." Thesis, Nice, 2014. http://www.theses.fr/2014NICE4065/document.
Full textIn this thesis, we study several models of energy-Aware routing. For each model, we present a linear programming formulation to find the exact solution. Moreover, since energy-Aware routing is NP-Hard problem, we also propose efficient heuristic algorithms for large scale networks. In the first part of this thesis, we deal with GreenRE - a new energy-Aware routing model with the support of redundancy elimination. We first present a deterministic model in which we show how to combine energy-Aware routing and redundancy elimination to improve energy efficiency for backbone networks. Then, we extend the model in order to take into account uncertainties in traffic volumes and redundancy rates. The second part of this thesis is devoted to the deployment issues of energy- aware routing in practice. In detail, to avoid service deterioration for end-Users, we limit changes of network configurations in multi-Period traffic matrices in Open Shortest Path First (OSPF) protocol. Next, we address the problem of limited rule space in OpenFlow switches when installing energy-Aware routing configurations. Finally, we present in the appendix other works developed during this thesis: multicast network protocol and TCP congestion control algorithm
Gauron, Philippe. "Interconnexion et routage efficaces pour des procédures de recherche décentralisées dans les systèmes pair-à-pair." Phd thesis, Université Paris Sud - Paris XI, 2006. http://tel.archives-ouvertes.fr/tel-00140901.
Full textBoros, Christina Ann. "Factors affecting the immunogenicity and protective efficacy of routine childhood immunisations." Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phb736.pdf.
Full textCentelles, Vanessa. "Dating Application Facilitated Victimization: An Examination of Lifestyle-Routine Activities, Self-Control, and Self-Efficacy." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7764.
Full textPerisoglou, M. "Efficacy and safety of glucarpidase for routine use after high dose methotrexate in patients with bone sarcoma." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1416302/.
Full textMoataz, Fatima Zahra. "Vers des réseaux optiques efficaces et tolérants aux pannes : complexité et algorithmes." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4077/document.
Full textWe study in this thesis optimization problems with application in optical networks. The problems we consider are related to fault-tolerance and efficient resource allocation and the results we obtain are mainly related to the computational complexity of these problems. The first part of this thesis is devoted to finding paths and disjoint paths. Finding a path is crucial in all types of networks in order to set up connections and finding disjoint paths is a common approach used to provide some degree of protection against failures in networks. We study these problems under different settings. We first focus on finding paths and node or link-disjoint paths in networks with asymmetric nodes, which are nodes with restrictions on their internal connectivity. Afterwards, we consider networks with star Shared Risk Link Groups (SRLGs) which are groups of links that might fail simultaneously due to a localized event. In these networks, we investigate the problem of finding SRLG-disjoint paths. The second part of this thesis focuses on the problem of Routing and Spectrum Assignment (RSA) in Elastic Optical Networks (EONs). EONs are proposed as the new generation of optical networks and they aim at an efficient and flexible use of the optical resources. RSA is the key problem in EONs and it deals with allocating resources to requests under multiple constraints. We first study the static version of RSA in tree networks. Afterwards, we examine a dynamic version of RSA in which a non-disruptive spectrum defragmentation technique is used. Finally, we present in the appendix another problem that has been studied during this thesis
Alldredge, Cameron Todd. "Treatment Failure Rates in Group Versus Individual Treatment Using the OQ-45: An Archival Replication." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7471.
Full textZientek, Linda Reichwein. "Do teachers differ by certification route? novice teachers' sense of self-efficacy, commitment to teaching, and preparedness to teach." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5751.
Full textPannell, Myra Carter. "What really works in teacher preparation programs| Teachers' self-efficacy and perceived successful methods after participation in Mississippi's career and technical education alternate route program." Thesis, Mississippi State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10141634.
Full textThe debate over the effective preparation of pre-service teachers is not new. Often this debate concerns what might be considered successful methods for all pre-service teachers. However, preparation for career and technical education (CTE) teachers could look quite different than that of academic teachers, whether they are prepared through traditional or alternative routes to education. In this qualitative study, the researcher examined two iterations of the alternative-route program designed to prepare new CTE teachers in Mississippi and considered the level of self-efficacy of the teacher participants, the perceived effectiveness of the specific elements of each program, and the perceived significance of teacher/administrator and teacher/mentor relationships. The results of this study indicate that participants in the most recent iteration of the alternative-route program have a higher level of self-efficacy in teaching. The study also found that the specific elements of the newer version of the program are perceived as more relevant than those of the older version of the program and that teacher/administrator and teacher/mentor relationships play a key role in self-efficacy and job satisfaction among new CTE teachers. The results of this study also revealed that new CTE teachers desire opportunities to grow their pedagogical content knowledge by interacting and learning from veteran teachers in their respective content areas. Additionally, some of the more effective teachers who participated in this study rated themselves lower than their less effective colleagues on a self-efficacy survey and vice versa, indicating the presence of the Dunning-Kruger effect, which posits that, when an individual is unskilled in a certain task, they not only make poor choices in that area but also lack the metacognitive ability to realize it.
Azevedo, Eliete Farias. "Administração de antibióticos por via subcutânea: uma revisão integrativa da literatura." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/22/22132/tde-19012012-104714/.
Full textThe administration of medication by subcutaneous route is considered safe, simple to handle and described as an alternative to intravenous and intramuscular routes in patients in palliative care (PC) with difficult venous access. The lack of studies and the little disclosure of this parenteral route to administer antibiotics restrict its use. Therefore, this integrative literature review aimed to identify and analyze the evidences available in scientific literature on the use of antibiotics by subcutaneous route in patients with difficult venous access in PC regarding the local tolerance and therapeutic efficacy, using as theoretical framework Evidence-Based Practice. The following five databases were used in the search and selection of studies: LILACS, CINAHL, PUBMED, EMBASE and Cochrane Library. The sample consisted of 17 studies, 4 with strong level of evidence (level II), 5 with moderate level of evidence (level III) and 8 with low level of evidence (level V and VI). Ten antibiotics were found: Ertapenem, Ceftriaxone, Cefepime, Teicoplanin, Ampicillin, Tobramycin, Amikacin, Netilmicin, Sisomicin and Gentamicin. The antibiotic Ceftriaxone was studied the most. The therapeutic efficacy was satisfactory via subcutaneous route, according to the pharmacokinetic parameters when compared to intravenous and intramuscular routes, varying from study to study according to characteristics of the studied population, dose and concentration of the antibiotics. Confirmation of the therapeutic efficacy by clinical parameters was evaluated in one study about Ceftriaxone with improvement of clinical symptoms of patients and cure of the infection. With regard to local tolerance, it was found that the higher the dilution of the antibiotic, the better the tolerance. Except for Tobramycin, all aminoglycosides have been associated with severe injury progressing to tissue necrosis. The low tolerance reinforces the restriction of use only to this class of antibiotics. No local intolerance was observed for Ampicillin and Ertapenem. Teicoplanin showed good local tolerance: there was only one report of pain and erythema when using water as diluent for injection. With Cefepime, the following was observed: 2 cases of mild edema with erythema followed by minimal pain, and 1 case of local itching. For Ceftriaxone 2 g associated with Lidocaine 1%, pain and tissue necrosis was observed, with 0.5 g no intolerance was observed, and with 1 g there was good tolerance, however, in all cases with previous saline placebo or Hyaluronidase there was complaint of pain. Predictions of therapeutic efficacy and good tolerability observed for antibiotics with subcutaneous route suggest a possibility to be considered when there is need of an alternative parenteral route for administration. However, there is for caution and careful evaluation as there is a gap on the use of antibiotics vie subcutaneous route in PC and their specific needs and conditions. Although the evidenced data strengthen the body of knowledge for nursing in decision making for the implementation of care, there is need of further studies with strong level of evidence and good methodological quality that can prove or refute the effectiveness of these antibiotics through subcutaneous route to patients in PC.
Dynes, Morgan E. "A National Study of Child and Family Therapists: The Relationships between Parent Engagement, Supervision and Training, and Burnout." Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1452267611.
Full textLiang, Chia Yi, and 梁佳頤. "Efficacy of Modified Routine-Based Intervention on Developmental and Daily Function in Children with Autism Spectrum Disorder." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107CGU05789008%22.&searchmode=basic.
Full text長庚大學
早期療育研究所
107
Background and Purpose: Children withAutism Spectrum Disorders (ASD) are often associated with other developmental and functional problems in addition to core symptoms. In recent years, early intervention focused on family-centered treatment. In a variety of interventions, Routine-Based Intervention is the best way to provide children numerous of learning opportunities in their daily living environments. However, there is no related research for children with ASD. In order to cope with Taiwan’s culture, this study used Modified Routine-Based Intervention to identify the efficacy on developmental function in children with ASD. Methods: This randomize-controlled study enrolled 35 children with ASD, aged between 3 to 9 years old. The experimental group (MRBI) received MRBI and the controlled group (TT) received traditional therapy. Both groups received a 24-hour intervention 2 hours per week. Homeprogram were given after discussing with the parents. The pretest, posttest and 3-month follow-up test were conducted by using these assessments: for Autism characteristics (The Children Autism Rating Scale Second Edition, Clancy Behavior Scale, Childhood Asperger Syndrome Test, Social Responsiveness Scale, Second Edition), for cognitive function (Theory of Mind Inventory-Second Edition), for visual motor integration (The Berry-Buktenica Developmental Test of Visual-Motor Integration), for language function (Preschool Language Impaired Scale/Language Impaired Scale, Peabody Picture Vocabulary Test-Revised), for activity and participation (Comprehensive Developmental Inventory for Infants and Toddlers, Assessment of preschool children’s participation/Children Assessment of Participation and Enjoyment and Preferences for Activity of Children, Functional Independence Measure for Children, Goal Attainment Scale), and for environmental factor (Parenting Stress Index, Parenting satisfaction). Analysis of covariance (ANCOVA) was used to test collected data. Results: In posttest, Greater improvement was found in MRBI group in Theory of Mind Inventory-Second Edition (p<.050), Functional Independence Measure for Children (p<.050), and Goal Attainment Scale (p<.010) than those in TT group. In 3-month follow-up test, greater improvement was found in MRBI group than in TT groupnot only inassessments mentioned above, but also in Clancy Behavior Scale(p=.028), Social Responsiveness Scale, Second Edition(p=.017), Assessment of preschool children’s participation/Children Assessment of Participation and Enjoyment and Preferences for Activity of Children(p=.035),and Parenting satisfaction(p=.008). No significant improvement was found in other assessments neither in posttest nor 3-month follow-up test. Conclusion: This study is the first study using MRBI on children with ASD.MRBI can not only improve the theory of mind abilities, daily functionsand participation, continuing its effect after 3 months, but also improve autistic characteristics. MRBI is a family-centered intervention and directly apply to daily life, so it has sustained effect. It can be used as one of the treatments for children with ASD in the future.
Lant, JAMES. "INTIMATE PARTNER VICTIMIZATION IN CANADA: A TEST OF RISK FACTORS, SELF-CONTROL, ROUTINE ACTIVITIES, SOCIAL DISORGANIZATION, AND COLLECTIVE EFFICACY." Thesis, 2014. http://hdl.handle.net/1974/8662.
Full textThesis (Master, Sociology) -- Queen's University, 2014-03-21 16:34:44.083
Silva-Beaudry, Claude-Olivier. "Influence des routes sur la variance du succès reproducteur des populations de tortues peintes (Chrysemys Picta)." Thèse, 2008. http://hdl.handle.net/1866/7557.
Full text