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Dissertations / Theses on the topic 'TDMA protocols'

Author: Grafiati

Published: 7 September 2021

Last updated: 29 July 2025

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1

Micic, Aleksandar. "Initialization protocols for TDMA in single-hop wireless network." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26523.

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Although collision free TDMA schemes have been proposed and used for more than two decades, an important ingredient of these schemes, the initialization of stations (that is, assigning ID numbers 1,2,...,N) was not investigated until recently. In this thesis, we propose several new randomized and deterministic initialization methods, and measure the performance of these new and some known methods. The main contributions of this thesis are new randomized hybrid algorithms for the cases of known and unknown number of users. Performance of these algorithms was evaluated by comparing it with impro

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2

PINHEIRO, ANA LUCIA DE ALBUQUERQUE. "MULTIPLE ACCESS PROTOCOLS FOR TDMA TECHNOLOGY IN MÓBILE COMMUNICATIONS SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8694@1.

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O rápido desenvolvimento tecnológico que ocorreu na área de comunicações móveis e o surpreendente interesse por parte dos usuários geraram um crescimento da demanda maior que o esperado. A necessidade de atender essa demanda e de suportar novos serviços como áudio, vídeo e multimídia, vem motivando o estudo de novas tecnologias. Atualmente, um dos objetivos principais é o aumento da capacidade da interface rádio. Visando este objetivo, diversos métodos de acesso vêm sendo propostos. Neste trabalho será feita uma análise de três protocolos de acesso proposta para tecnologia TDMA: o

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3

NEVES, MARCIO FRITSCH TOROS. "PERFORMANCE OF MULTIPLE ACCESS TDMA PROTOCOLS IN SATELLITE ATM NETWORKS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8868@1.

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Com o objetivo de prover acesso global ao mundo da informação, as comunicações via satélite desempenham um papel fundamental, possibilitando o acesso de serviços de faixa larga em áreas onde a infra-estrutura terrestre não permite. Este trabalho apresenta uma caracterização destas aplicações potenciais para redes ATM via satélite, descrevendo os problemas e as limitações que ainda precisam ser superados, assim como as soluções que já foram sugeridas. Entre estes problemas, está o desenvolvimento de protocolos de múltiplo acesso que possibilitem a utilização eficiente do segmento espa

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4

Louis, Lee Winnie. "Flexible-schedule-based TDMA protocols for supporting fault-tolerance, on-demand TDMA slot transfer, and peer-to-peer communication in wireless sensor networks." University of Western Australia. School of Computer Science and Software Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0028.

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[Truncated abstract] This thesis develops a scheduled protocol (time division multiple access, TDMA) called flexible-schedule-based TDMA Protocol (FlexiTP), to address the problem of providing end-to-end guarantees on data delivery, whilst also respecting severe resource constraints of wireless sensor networks. FlexiTP achieves this balance through a distributed, synchronised, and loose slot structure in which sensor nodes can build, modify, or extend their schedules based on their local information. In FlexiTP, it is not necessary to predetermine the number of slots required for a network. Fl

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5

Hadded, Mohamed. "Design and optimization of access control protocols in Vehicular Ad Hoc Networks (VANETs)." Thesis, Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0023/document.

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Les accidents routiers et leurs dommages représentent un problème croissant dans le monde entier. Dans ce contexte, les réseaux véhiculaires (VANETs) peuvent être déployés pour réduire les risques et pour améliorer le confort. Ils permettent aux véhicules d'échanger différents types de données qui vont des applications de sécurité et de gestion du trafic aux applications de confort. De nos jours, les applications de sécurité sont l’objet de beaucoup d'attention des chercheurs ainsi que des fabricants d'automobiles. Dans cette thèse, nous étudierons les applications critiques pour la sécurité r

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6

Salayma, Marwa. "Reliable and energy efficient scheduling protocols for Wireless Body Area Networks (WBAN)." Thesis, Edinburgh Napier University, 2018. http://researchrepository.napier.ac.uk/Output/1532410.

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Wireless Body Area Network (WBAN) facilitates efficient and cost-effective e-health care and well-being applications. The WBAN has unique challenges and features compared to other Wireless Sensor Networks (WSN). In addition to battery power consumption, the vulnerability and the unpredicted channel behavior of the Medium Access Control (MAC) layer make channel access a serious problem. MAC protocols based on Time Division Multiple Access (TDMA) can improve the reliability and efficiency of WBAN. However, conventional static TDMA techniques adopted by IEEE 802.15.4 and IEEE 802.15.6 do not suff

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7

Hadded, Mohamed. "Design and optimization of access control protocols in Vehicular Ad Hoc Networks (VANETs)." Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0023.

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Les accidents routiers et leurs dommages représentent un problème croissant dans le monde entier. Dans ce contexte, les réseaux véhiculaires (VANETs) peuvent être déployés pour réduire les risques et pour améliorer le confort. Ils permettent aux véhicules d'échanger différents types de données qui vont des applications de sécurité et de gestion du trafic aux applications de confort. De nos jours, les applications de sécurité sont l’objet de beaucoup d'attention des chercheurs ainsi que des fabricants d'automobiles. Dans cette thèse, nous étudierons les applications critiques pour la sécurité r

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8

Sánchez, Garache Marvin. "Multihop Wireless Networks with Advanced Antenna Systems : An Alternative for Rural Communication." Doctoral thesis, KTH, Kommunikationssystem, CoS, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4755.

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Providing access to telecommunication services in rural areas is of paramount importance for the development of any country. Since the cost is the main inhibiting factor, any technical solution for access in sparsely populated rural areas has to be reliable, efficient, and deployable at low-cost. This thesis studies the utilization of Multihop Wireless Networks (MWN) as an appealing alternative for rural communication. MWN are designed with a self-configuring capability and can adapt to the addition or removal of network radio units (nodes). This makes them simple to install, allowing unskille

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Santos, Frederico Miguel do Céu Marques dos. "Architecture for real-time coordination of multiple autonomous mobile units." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13969.

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Doutoramento em Engenharia Electrotécnica<br>Interest on using teams of mobile robots has been growing, due to their potential to cooperate for diverse purposes, such as rescue, de-mining, surveillance or even games such as robotic soccer. These applications require a real-time middleware and wireless communication protocol that can support an efficient and timely fusion of the perception data from different robots as well as the development of coordinated behaviours. Coordinating several autonomous robots towards achieving a common goal is currently a topic of high interest, which can

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Pawgasame, Wichai, and Wuttisak Sa-Ad. "Self-Organized TDMA protocol for Tactical Data Links." Thesis, Linköpings universitet, Kommunikationssystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72159.

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A Tactical Data Link (TDL) system has been deployed in many military missions as a winning strategy. The performance of a TDL system is governed by the MAC protocol. The MAC protocol that is able to provide more flexibility and high quality of services is more desirable. However, most MAC protocols implemented in current TDL systems are based on a preprogramming TDMA protocol, in which a time slot schedule is fixed. This thesis presents the new self-organized TDMA protocol based on the existing self-organized slot assignment algorithms and the practical military scenarios as the alternative so

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Cui, Qin. "TDMA-based Routing Protocol in Industrial Wireless Sensor Networks." Thesis, Mittuniversitetet, Avdelningen för informations- och kommunikationssystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-19748.

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Oliveira, Roberto Massi de. "A Cooperative MAC Protocol to Improve the Performance of In-Home Broadband PLC Systems." Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/64.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2015-12-01T12:45:13Z No. of bitstreams: 1 robertomussideoliveira.pdf: 1293292 bytes, checksum: 78c6c9fd9415c0b3990a1aaf55b842a2 (MD5)<br>Made available in DSpace on 2015-12-01T12:45:13Z (GMT). No. of bitstreams: 1 robertomussideoliveira.pdf: 1293292 bytes, checksum: 78c6c9fd9415c0b3990a1aaf55b842a2 (MD5) Previous issue date: 2015-03-11<br>CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Nesse trabalho, discutimos o uso de protocolos de coopera¸c˜ao na subcamada de controle de acesso ao meio (CMAC) para reduzir a

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13

Tunç, Muharrem Ali. "Performance Evaluation of a TDMA MAC Protocol in Airborne Telemetry Networks." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604270.

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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>Emerging airborne telemetry networks are going beyond traditional point-to-point communication. The iNET telemetry architecture uses a TDMA MAC with relay nodes that enable multi-hop communication. We analyze the performance of the iNET TDMA MAC protocol with respect to various parameters such as number of nodes, flight range, number of relays, and number of hops via mathematical

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14

Höller, Yvonne. "A TDMA-MAC Protocol for a Seismic Telemetry-Network with Energy Constraints." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605941.

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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>The requirements for a seismic telemetry-network are even more stringent than the well known problems of sensor networks. Existing medium access control (MAC) protocols suggest reducing energy consuming network activity by reducing costly transmissions and idle listening. Furthermore, it is required to set up communication patterns in different priority levels as well as ensuring

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15

Fiske, Robert M. "Implementation and Evaluation of a TDMA Based Protocol for Wireless Sensor Networks." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1293497167.

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16

D, Rajaveerappa. "Design and Development of a Hybrid TDMA/CDMA MAC Protocol for Multimedia Wireless Networks." Thesis, Indian Institute of Science, 2004. https://etd.iisc.ac.in/handle/2005/89.

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A wireless local area network (WLAN) provides high bandwidth to users in a limited geographical area. This network faces certain challenges and constraints that are not imposed on their wired counterparts. They are: frequency allocation, interference and reliability, security, power consumption, human safety, mobility, connection to wired LAN,service area, handoff and roaming, dynamic configuration and the throughput. But the wireless medium relies heavily on the features of MAC protocol and the MAC protocol is the core of medium access control for WLANs. The available MAC protocols all have

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D, Rajaveerappa. "Design and Development of a Hybrid TDMA/CDMA MAC Protocol for Multimedia Wireless Networks." Thesis, Indian Institute of Science, 2004. http://hdl.handle.net/2005/89.

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A wireless local area network (WLAN) provides high bandwidth to users in a limited geographical area. This network faces certain challenges and constraints that are not imposed on their wired counterparts. They are: frequency allocation, interference and reliability, security, power consumption, human safety, mobility, connection to wired LAN,service area, handoff and roaming, dynamic configuration and the throughput. But the wireless medium relies heavily on the features of MAC protocol and the MAC protocol is the core of medium access control for WLANs. The available MAC protocols all have t

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18

Ajib, Wessam. "Gestion d'un flux temporaire de données dans un réseau radio-mobile TDMA." Paris, ENST, 2001. http://www.theses.fr/2001ENST0001.

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Le sujet de nos travaux est la gestion de transmission d'un flux temporaire de données dans un réseau radio mobile d'accès TDMA comme GPRS (General Pachet Radio Service). Le GPRS est un service de transmission de données par paquet qui utilise la structure et le support physique de GSM. Un flux temporaire de données représente la quantité de données transmise durant une connexion physique. La transmission de ce flux est gérée par différents protocoles. Nos études s'intéressent à optimiser certains protocoles de la couche de liaison qui concernent particulièrement l'accès aux ressources radio e

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19

Sanz, Gil Roberto. "Contribución al diseño de los niveles físico y MAC/LLC de redes de comunicaciones móviles orientadas a aplicaciones y servicios multimedia." Doctoral thesis, Universidad de Cantabria, 2001. http://hdl.handle.net/10803/10675.

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Esta tesis tiene como objetivo final la propuesta de un protocolo de acceso al medio imbricado con los parámetros de nivel físico que dan soporte a dicho protocolo. Puesto que la propuesta se basa en un esquema TDMA, se eligen como base del análisis los sistemas de segunda generación GSM, TETRA y DECT, a partir de los cuales se extrapolan determinados parámetros a fin de sintonizarlos con los sistemas de tercera generación en su especificación TDMA. Se evalúan dichos sistemas a nivel físico sobre diferentes modelos de canal de propagación y distintas técnicas de compensación implementadas en e

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Silveira, Luã Moloise Fernandes da. "CodePLC: um protocolo de network coding MAC para power line communication." Universidade Federal de Juiz de Fora (UFJF), 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/4765.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-05-30T14:18:27Z No. of bitstreams: 1 luamoloisefernandesdasilveira.pdf: 589211 bytes, checksum: e51494b1c23ff74fa1fc26264147a6a1 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-05-30T15:36:08Z (GMT) No. of bitstreams: 1 luamoloisefernandesdasilveira.pdf: 589211 bytes, checksum: e51494b1c23ff74fa1fc26264147a6a1 (MD5)<br>Made available in DSpace on 2017-05-30T15:36:08Z (GMT). No. of bitstreams: 1 luamoloisefernandesdasilveira.pdf: 589211 bytes, checksum: e51494b1c23ff74fa1fc26264147a6a1

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Sayadi, Afef. "Medium access protocol (MAC) design for wireless multi-hop ad hoc and sensor networks." Thesis, Evry, Institut national des télécommunications, 2013. http://www.theses.fr/2013TELE0002/document.

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Les réseaux sans fil multi-sauts ad hoc et les réseaux de capteurs présentent une solution prometteuse pour assurer une connectivité quasi-permanente dans l'Internet du Futur. Cette connectivité, néanmoins, nécessite la conception d'un protocole d'accès au canal radio fiable, ce qui défi les caractéristiques hostiles et instables des réseaux ad hoc et des réseaux de capteurs. Cet environnement, en effet, est caractérisé par la rareté des ressources radio disponibles, la perte de la bande passante due aux collisions et aux interférences. La nécessité de garantir une meilleure qualité de service

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22

Brand, Alex Emin. "A PRMA based medium access control protocol for the uplink of a third generation hybrid CD/TDMA air interface." Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391769.

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23

Biazi, Adelcio. "Algoritmo baseado em TDMA sleep scheduling com time-slot flexível para redes de sensores sem fio." Pontifícia Universidade Católica do Rio Grande do Sul, 2015. http://hdl.handle.net/10923/7681.

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Made available in DSpace on 2015-11-14T01:06:08Z (GMT). No. of bitstreams: 1 000476061-Texto+Completo-0.pdf: 1784422 bytes, checksum: d3eac64efed456626b720b6ff5c174a4 (MD5) Previous issue date: 2015<br>The sensors devices obtained a great evolution in recent years, primarily due to the advancement of manufacturing techniques of electronic devices. And with the evolution of wireless communications techniques, it has been possible to implement wireless sensor networks in numerous types of applications. One of the biggest issues concerning these systems is their limited energy supply during eld

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24

Hon, Lenny Kwok-Ming. "Performance evaluation of the movable-slot TDM protocol and its application in metropolitan area networks." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26706.

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Movable-slot time-division multiplexing (MSTDM) is a medium access control protocol for the integration of voice and data in local area networks. In this thesis, the performance of this protocol is evaluated through mathematical analysis and simulation. Its application in metropolitan area networks is also studied. For the performance evaluation, a non-pre-emptive priority queuing model is first proposed for analysing the mean data delay characteristic of the slotted non-persistent carrier-sense multiple access with collision detection (CSMA/CD) protocol. Then this analytical approach is ext

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Ibrāhīm, ʿAbbās. "Protocoles d'accès multiple orientés qualité de service en constellation de satellites à orbite basse." Paris, ENST, 2002. https://pastel.archives-ouvertes.fr/tel-00005647.

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Gianoto, Antonio Carlos. "O processo de migração de sistemas corporativos de comunicação TDM para plataformas convergentes IP com preservação de ativos." Universidade Presbiteriana Mackenzie, 2006. http://tede.mackenzie.br/jspui/handle/tede/2749.

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Made available in DSpace on 2016-04-18T21:39:45Z (GMT). No. of bitstreams: 4 Antonio Carlos GIANOTO1.pdf: 620239 bytes, checksum: aa779772dff23531ab717870d36823d3 (MD5) Antonio Carlos GIANOTO2.pdf: 1522259 bytes, checksum: 928d1a566cc9977b69a13b358fe13a50 (MD5) Antonio Carlos GIANOTO3.pdf: 2036577 bytes, checksum: 4ef7b886a0d20792d494deb085435041 (MD5) Antonio Carlos GIANOTO4.pdf: 1519186 bytes, checksum: cce13633bbc1cf7d5714a8dd727dd008 (MD5) Previous issue date: 2006-06-29<br>Fundo Mackenzie de Pesquisa<br>The aim of this elaboration is to present a study of the migration process involved

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Biazi, Adelcio. "Algoritmo baseado em TDMA sleep scheduling com time-slot flex?vel para redes de sensores sem fio." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2015. http://tede2.pucrs.br/tede2/handle/tede/6393.

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Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-11-13T18:46:36Z No. of bitstreams: 1 476061 - Texto Completo.pdf: 1784422 bytes, checksum: d3eac64efed456626b720b6ff5c174a4 (MD5)<br>Made available in DSpace on 2015-11-13T18:46:36Z (GMT). No. of bitstreams: 1 476061 - Texto Completo.pdf: 1784422 bytes, checksum: d3eac64efed456626b720b6ff5c174a4 (MD5) Previous issue date: 2015-03-31<br>The sensors devices obtained a great evolution in recent years, primarily due to the advancement of manufacturing techniques of electronic devices. And with the evolution of wir

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Ibrahim, Abbas. "Protocoles d'accès multiple orientés qualité de service en constellation de satellite à orbite basse." Phd thesis, Télécom ParisTech, 2002. http://tel.archives-ouvertes.fr/tel-00005647.

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Pendant les dernières années, le réseau cellulaire est devenu accessible presque partout. Pour compléter ce réseau cellulaire terrestre, plusieurs systèmes basés sur des satellites à basse orbite (LEO Low Earth Orbit) et moyenne orbite (MEO Medium Earth Orbit) ont été développés pour offrir une couverture globale. Les services multimédias sont largement demandés sur une échelle globale.<br />Notre but est de développer une couche d'accès MAC au canal satellitaire tout en respectant les contraintes de la constellation LEO. Un grand nombre d'utilisateurs de différents types vont essayer d'accéde

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SAYADI, Afef. "Medium access protocol (MAC) design for wireless multi-hop ad hoc and sensor networks." Phd thesis, Institut National des Télécommunications, 2013. http://tel.archives-ouvertes.fr/tel-00997665.

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Wireless multi-hop ad hoc and sensor networks provide a promising solution to ensure ubiquitous connectivity for the Future Internet. Good network connectivity requires designing a reliable Medium Access Control (MAC) protocol, which is a challenging task in the ad hoc and sensor environments. The broadcast and shared nature of the wireless channel renders the bandwidth resources limited and expose the transmissions to relatively high collisions and loss rates. The necessity to provide guaranteed Quality of Service (QoS) to the upper layers triggered the design of conflict-free MAC protocols.

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Coupechoux, Marceau. "Protocoles distribués de contôle d'accès au médium pour réseaux ad hoc fortements chargés." Paris, ENST, 2004. http://www.theses.fr/2004ENST0021.

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Cette thèse apporte une contribution au domaine des protocoles de contrôle d'accès au médium (MAC) for réseaux ad hoc sans fil. Ces réseaux sont par définition créés pour l'occasion et ne nécessitent aucune infrastructure a priori. La norme IEEE 802. 11 permet de réaliser aisément des réseaux ad hoc mais souffre de faiblesses en termes de capacité et d'équité, en particulier à forte charge. Cette thèse propose des alternatives à la norme. Le chapitre 1 dégage de la littérature une classification des protocoles MAC et distingue deux familles : les protocoles basés sur la compétition et ceux san

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Sobral, Marcelo Maia. "Um Controle de acesso ao meio híbrido em redes sem-fio para coordenação de sistemas de tempo-real autônomos e móveis." Florianópolis, SC, 2011. http://repositorio.ufsc.br/xmlui/handle/123456789/94844.

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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2011<br>Made available in DSpace on 2012-10-25T16:54:30Z (GMT). No. of bitstreams: 1 296722.pdf: 2285068 bytes, checksum: 9d2dc2ca0efc188ccce4ec6c2477a046 (MD5)<br>Esta tese propõe um protocolo MAC híbrido para redes ad hoc móveis denominado HCT-MAC (Hybrid Contention/TDMA MAC). A principal característica deste protocolo é o fato do mesmo suportar a mobilidade de nodos e ao mesmo tempo oferecer meios para atender prazos de entrega de mensagens. Para ta

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Louail, Lemia. "Approches cross-layer pour l'optimisation de la latence des communications dans les réseaux de capteurs sans fil." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2063/document.

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Pour assurer les communications dans un réseau de capteurs sans fil, les capteurs utilisent un modèle simplifié de protocoles en couches inspiré du modèle OSI. Ce modèle comporte cinq couches, chaque couche devant assurer des fonctionnalités indépendantes et particulières. Nous nous intéressons à deux couches qui sont impliquées directement dans les décisions assurant les communications, la couche Liaison de données dans laquelle le protocole MAC assure la coordination des communications entre voisins directs, et la couche Réseau dans laquelle le protocole de routage est responsable de trouver

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Sales, Gil Jorge. "Distributed Mobile Robot Localization and Communication System for Special Interventions." Doctoral thesis, Universitat Jaume I, 2011. http://hdl.handle.net/10803/78871.

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This thesis focuses on the development of a distributed mobile robot localization and communication system for special interventions like those carried out by fire-fighters in fire ground search and rescue. The use case scenario is related to the one described for the GUARDIANS EU project, where a swarm formation of mobile robots accompany a fire fighter during a rescue intervention in a warehouse. In this line, localizing the robots and the fire fighter during an indoor intervention with the presence of smoke is one of the more interesting challenges in this scenario. Several localization tec

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Vecchia, Davide. "Energy-efficient, Large-scale Ultra-wideband Communication and Localization." Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/349081.

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Among the low-power wireless technologies that have emerged in recent years, ultra-wideband (UWB) has successfully established itself as the reference for accurate ranging and localization, both outdoors and indoors. Due to its unprecedented performance, paired with relatively low energy consumption, UWB is going to play a central role in the next wave of location-based applications. As the trend of integration in smartphones continues, UWB is also expected to reach ordinary users, revolutionizing our lives the same way GPS and similar technologies have done. But the impact of UWB may not be l

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Bonaldi, Vincent-Marie. "Protocole de recherche clinique en imagerie tdm hepatique : comparaison d'une acquisition spiralee et d'une acquisition conventionelle ; etude prospective randomisee de 168 patients realisee a l'hopital general de montreal/quebec/canada, entre le 1er novembre 1992 et le 1er avril 1993." Nice, 1994. http://www.theses.fr/1994NICE6501.

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Ciappuccini, Renaud. "Apport de l'imagerie fonctionnelle par TEMP/TDM et TEP/TDM dans la prise en charge des cancers différenciés de la thyroïde Incremental Value of a Dedicated Head and Neck Acquisition during 18F-FDG PET/CT in Patients with Differentiated Thyroid Cancer Full text links full-text provider logo Actions Favorites Share Page navigation Title & authors Abstract Conflict of interest statement Figures Similar articles Cited by References Related information LinkOut - more resources EJNMMI Res . 2018 Dec 3;8(1):104. doi: 10.1186/s13550-018-0461-x. Optimization of a dedicated protocol using a small-voxel PSF reconstruction for head-and-neck 18 FDG PET/CT imaging in differentiated thyroid cancer 78 Lymph node involvement in head-and-neck and thyroid cancers with digital PET/CT: the impact of ultra-high definition voxels and point-spread function Tumor burden of persistent disease in patients with differentiated thyroid cancer: correlation with postoperative risk-stratification and impact on outcome 133 18F-Fluorocholine PET/CT is a highly sensitive but poorly specific tool for identifying malignancy in thyroid nodules with indeterminate cytology: The Chocolate study PSMA expression in neovasculature of persistent/recurrent differentiated thyroid cancerin the neck: relationship with radioiodine uptake, 18Fluorodeoxyglucose avidity and outcome." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMC424.

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L’imagerie scintigraphique des cancers thyroïdiens différenciés (CTD) présente la particularité d’utiliser deux radiopharmaceutiques, l’iode 131 (131I) et le 18-Fluorodésoxyglucose (18FDG). La fixation de ces traceurs dépend habituellement du degré de différenciation et de l’agressivité de la tumeur. L’objectif de ce travail était d’étudier l’apport de différents aspects techniques et d’instrumentation, à savoir l’imagerie hybride par TEMP/TDM et TEP/TDM, la point-spread function (PSF), la taille des voxels et la technologie TEP digitale, et d’explorer si d’autres traceurs TEP pouvaient présen

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"Multiple access protocols for tdma technology in móbile communications systems." Tese, MAXWELL, 1996. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=8694:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.

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Huang, Wun-Bin, and 黃文彬. "Centralized Energy-Efficient TDMA MAC Protocols for Wireless Sensor Network." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/44925579872972582279.

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碩士<br>國立嘉義大學<br>資訊工程學系研究所<br>94<br>Wireless sensor network, which is a special type of ad hoc networks, has many applications in various fields. Because of the difficulties of changing or recharging batteries for sensor nodes in many applications, how to save energy becomes a crucial issue for wireless sensor network. In order to reduce energy consumption of the sensor nodes, new communication protocols are needed for decreasing the amount of data processing and transmission as well as increasing the amount of sleep time of the sensor nodes. This research devises novel centralized energy-effic

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Watwe, Siddharth P. "Efficient Schemes for Improving the Performance of Clock Synchronization Protocols in Wireless Sensor Networks Using TDMA- based MAC Protocols." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3550.

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Clock synchronization in a wireless sensor network (WSN) is essential as it provides a consistent and a coherent time frame for all the nodes across the network. Typically, clock synchronization is achieved by message passing using carrier sense multiple access (CSMA) for media access. The nodes try to synchronize with each other, by sending synchronization request messages. If many nodes try to send messages simultaneously, contention-based schemes cannot efficiently avoid collisions which results in message losses and affects the synchronization accuracy. Since the nodes in a WSN have limite

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Watwe, Siddharth P. "Efficient Schemes for Improving the Performance of Clock Synchronization Protocols in Wireless Sensor Networks Using TDMA- based MAC Protocols." Thesis, 2015. http://etd.iisc.ernet.in/2005/3550.

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Clock synchronization in a wireless sensor network (WSN) is essential as it provides a consistent and a coherent time frame for all the nodes across the network. Typically, clock synchronization is achieved by message passing using carrier sense multiple access (CSMA) for media access. The nodes try to synchronize with each other, by sending synchronization request messages. If many nodes try to send messages simultaneously, contention-based schemes cannot efficiently avoid collisions which results in message losses and affects the synchronization accuracy. Since the nodes in a WSN have limite

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Perrotta, Annalisa, Luigi Palopoli, Salvatore Marano, and Rango Floriano De. "Proposal of new techniques for the efficient energy management in TDMA MAC protocols over Manets." Thesis, 2014. http://hdl.handle.net/10955/397.

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Burrowes, Gunilla Elizabeth. "Underwater swarm sensor networks: applications, deployment, and medium access communication protocols." Thesis, 2014. http://hdl.handle.net/1959.13/1058849.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Our oceans are vast and remain mostly unexplored. Advances in underwater technology have enabled exciting new applications for underwater wireless sensing and monitoring of the environment, fauna, flora, and human activity. The 'game changer', however, for future developments will be when swarms of mobile vehicles are able to undertake autonomous missions as they will increase the usefulness and ability to begin extensive sampling of the earth's oceans to gain an insight into this unknown world. Current solutions have been built around static

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Peng, Jheng-Bao, and 彭鉦堡. "Broadcast Protocols Using Multipoint Relays And Fountain Codes for FH/TDMA Ad Hoc Networks Under Jamming Environment." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/47455653444654536099.

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碩士<br>元智大學<br>通訊工程學系<br>99<br>This thesis mainly discusses the protocols for broadcasting through multihop multipoint relays in wireless ad hoc networks. A base station broadcasts packets, which are first fountain encoded, downlink to all ad hoc nodes through multipoint relays. For simplicity, the relays transmit their packets according to the schedule of FH/TDMA. We assume two jamming cases which cause packet damaged. One is block jamming and the other is bit jamming. Besides the well-known flooding protocol and the optimized link state routing (OLSR) protocol under block jamming, we propose

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Su, Yi-Xing, and 蘇益興. "The TDMA MAC Protocol for Wireless Mobile Backhaul Network." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/hn67ma.

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碩士<br>國立交通大學<br>資訊科學與工程研究所<br>103<br>For a mobile network, the most important issue is coverage. Using wireless method to extend the base station is better than the traditional wired method. It is quicker and easier to achieve the high coverages, and saving costs. Especially extend base stations in the suburbs by using the wired method, it will be more difficult and more expensive. So using the wireless technology can show its advantages significantly. However, wireless method faced many challenges. The most important problem is that all the base stations are using the same medium in the local

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Wang, Chong-an, and 王崇安. "A Self-Configuration TDMA Protocol for Wireless Sensor Network." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/55013446017832307895.

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碩士<br>國立雲林科技大學<br>資訊工程研究所<br>94<br>In this dissertation, a Self-Configuration Time Division Multiple Access (called SC-TDMA) MAC Protocol for sensor networks is proposed. The design goal of SC-TDMA is to solve collision, overhearing, idle listening and control packet overhead problems which are the main sources of power consumption for sensors. It is assumed that the network consists of a sink node and N sensor nodes. The sink node starts the SC-TDMA protocol to construct a tree spanning all the sensor nodes. Each node cooperates with its neighbors to construct the tree. After a node joins the

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Rosset, Valerio. "Services for safety-critical applications on dual-scheduled TDMA networks." Doctoral thesis, 2009. http://hdl.handle.net/10216/59195.

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Rosset, Valerio. "Services for safety-critical applications on dual-scheduled TDMA networks." Tese, 2009. http://hdl.handle.net/10216/59195.

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Chen, Chih-hao, and 陳志浩. "The Performance Study of TDMA/CSMA Protocol for Wireless Sensor Networks." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/02951457266277935153.

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碩士<br>國立雲林科技大學<br>通訊工程研究所碩士班<br>99<br>In recent years, many Medium Access Control (MAC) protocols were proposed to save power, such as Berkeley-MAC (B-MAC), Sift and Zebra MAC (Z-MAC), etc. B-MAC performs low power consumption communication by means of preamble sequence and low-power listening. Sift-MAC arranges the order of delivery for all nodes using random back-off mechanism, when they sense the same event. The node which has the shortest back-off time will deliver the data first. Thus the node reduces collision probability and energy consumption. Z-MAC is a kind of hybrid MAC protocol, wh

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Frigon, Jean-François. "Dynamic reservation TDMA medium access control protocol for wireless ATM networks." Thesis, 1998. http://hdl.handle.net/2429/8388.

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To meet the anticipated demand for wireless access to the broadband Asynchronous Transfer Mode (ATM) network, the concept of wireless ATM has been proposed in 1994 [1]. One of the main challenge in the design of a wireless ATM network resides in the conception of a Medium Access Control (MAC) protocol that will handle the different ATM services while providing an efficient utilization of the wireless channel. In this thesis, we propose a new Dynamic Reservation TDMA (DR-TDMA) MAC protocol for wireless ATM networks. DR-TDMA combines the advantage of distributed access and centralized con

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Tsai, Han-Gu, and 蔡漢郅. "A TDMA-Based QoS Multicast Protocol for Wireless Ad-Hoc Networks." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/06220494449724662967.

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碩士<br>中華大學<br>資訊工程學系碩士班<br>90<br>In this thesis, we propose a new TDMA-based QoS multicast routing protocol, namely the hexagonal-tree QoS multicast protocol, for a wireless mobile ad hoc network. Existing QoS routing solutions have addressed this problem by assuming a stronger multi-antenna model or a less stronger CDMA-over-TDMA channel model. This study attempts to build a new multicast tree structure, namely hexagonal tree, to serve as the QoS multicasting tree, where the MAC sub-layer is adopted the TDMA channel model. In this work, both of the hidden-terminal and exposed-termi

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