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Teses / dissertações sobre o tema "Communications"

Autor: Grafiati
Publicado: 4 de junho de 2021
Última modificação: 25 de julho de 2025

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1

Kodikara, Patabandi C. K. "Multimedia communications over 3G wireless communication systems." Thesis, University of Surrey, 2004. http://epubs.surrey.ac.uk/844270/.

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This thesis addresses the transmission of video over third generation radio access networks. The first part of the thesis investigates the capabilities of Universal Terrestrial Radio Access Networks (UTRAN) in terms of the provision of multimedia communications. The error performance and traffic requirements of real-time video transmission over circuit switched and packet switched connections are examined. The effect of network parameter settings upon video performances is evaluated, and optimum radio bearer configurations for the transmission of video are derived. A method of estimating recei
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2

Bezuidenhout, Quintus. "Satellite communications strategy selection for optimal LEO satellite communication." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71930.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: A low earth orbit satellite system can be useful in numerous communication applications where physical connections are not possible. Communication time available from any point on earth to the satellite is less than one hour per day. This one hour is fragmented into smaller time slots due to the satellite orbiting. This is not much time to transfer data and there is even less time available to transfer data when there are other external factors affecting the system. It is thus crucial to optimise the satellite communicat
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3

Murphy, Melvin Murphy. "Internal Strategies for Assessing Organizational Communication Channel Effectiveness." ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/3406.

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Evolving communication technology, the increased volume of information needed by businesses, and the intensified competitive environment have made internal company communication more critical to business success. The purpose of this multiple case study was to explore strategies used by managers and leaders of 3 law firms in the Commonwealth of Virginia for assessing the effectiveness of their organization's internal communication channels. The participating firms were recognized by their peers as being exceptionally well-managed. Data from interviews and company documents were analyzed through
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4

Radford, Benjamin. "Misinformation in eating disorder communications| Implications for science communication policy." Thesis, State University of New York at Buffalo, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1546959.

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<p> Though eating disorders are a serious public health threat, misinformation about these potentially deadly diseases is widespread. This study examines eating disorder information from a wide variety of sources including medical journals, news reports, and popular social activist authors. Examples of misinformation were identified, and three aspects of eating disorders (prevalence, mortality, and etiology) were chosen as key indicators of scientific illiteracy about those illnesses. A case study approach was then adopted to trace examples of misinformation to their original sources whenever
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5

Rajapakshalage, D. (Dhanushka). "Infrastructure based communication architecture to facilitate autonomous driving and communications." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201909242926.

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Abstract. The traditional autonomous vehicle (AV) architecture places a heavy burden on graphics processing units of the vehicle due to heavy signal processing requirements. Ultimately this results in performance degradation in AVs. This is mainly due to advanced sensors, which enable the vision for AVs, like Light Detection and Ranging (LiDAR), radars and cameras. In most of the AV models accepted by many leading automobile companies, LiDAR plays a significant role. It generates a high definition (HD) point cloud of the surroundings to obtain a precise map. AV makes decisions based on that by
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6

Gregersen, Svein Erik Søndervik. "Underwater Communications : An OFDM-system for Underwater Communications." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8735.

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<p>In the fall 2006 NTNU (The Norwegian University and Science and Technology) initiated a strategic project in cooperations with SINTEF where the aim is to gain more knowledge about underwater acoustic communications. This study is a part of this project and focuses on a system for underwater communication. A orthogonal frequency division multiplexing (OFDM) system using differential quadrature phase shift keying (DQPSK) has been defined and implemented in MATLAB. The system has been characterized through thorough simulations and testing. Initial measurements has also been carried out in orde
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7

Wong, Chi Chong. "Personal communications." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/70862.

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8

Lichtman, Marc Louis. "Antifragile Communications." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/72267.

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Jamming is an ongoing threat that plagues wireless communications in contested areas. Unfortunately, jamming complexity and sophistication will continue to increase over time. The traditional approach to addressing the jamming threat is to harden radios, such that they sacrifice communications performance for more advanced jamming protection. To provide an escape from this trend, we investigate the previously unexplored area of jammer exploitation. This dissertation develops the concept of antifragile communications, defined as the capability for a communications system to improve in perfo
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9

Дядечко, Алла Миколаївна, Алла Николаевна Дядечко, Alla Mykolaivna Diadechko, and A. N. Zholudeva. "Marketing communications." Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/18327.

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Marketing communications is defined by actions a firm takes to communicate with end-users, consumers and external parties. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/18327
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10

Vantine, Karin. "Communications sourcebook /." Online version of thesis, 1992. http://hdl.handle.net/1850/11867.

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11

Puglia, Vincent. "Unified communications : the search for ROI through tomorrow's business communication solutions /." Online version of thesis, 2010. http://hdl.handle.net/1850/11590.

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12

Steele, Robert Joshua. "Determining Communications Resource Feasibility in a Tactical Communications Network." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32418.

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In this paper, we present solutions concerning communications resource allocation for tactical communication networking. Given a mission definition (which defines communication needs among participants) and participant capabilities (such as processing power and bandwidth), algorithms are presented to determine if the mission as presented is feasible. The mathematical foundation of the problem is presented, and a â staticâ model to determine feasibility is shown. Further evolution of the algorithm into a â dynamicâ model and the reasons for the more demanding requirements are present
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13

Germerie, Guizouarn Loïc. "Automates communicants et communications quasi-synchrones." Electronic Thesis or Diss., Université Côte d'Azur, 2023. http://www.theses.fr/2023COAZ4112.

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Les systèmes distribués sont le plus souvent basés sur l'échange asynchrone de messages entre des agents. La programmation par échanges de messages est largement utilisée en calcul haute performance, en programmation événementielle, dans les architectures orientées service, etc. Malheureusement du fait de la variété des modèles de communication, des ambiguïtés dans les spécifications, de la portabilité limitée du code, ou encore de la difficulté à exécuter des tests, il est très difficile de vérifier les systèmes communicants. Le model-checking de systèmes communicants vise à analyser des modè
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14

Oswald, Jennalande. "Transparency and City Government Communications." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2005.

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This study expresses the need for a communications model created specifically for government communications that is centered on the concept of transparency. However, it also recognizes the previous research done pertaining to government communications and public relations. Importantly, the study recognizes the lack of trust in American government at city, state and federal levels and the need to improve trust, which is very closely related to transparency. The study focuses primarily on a model created in 2007 called the three-dimensional model for government communications. The model has four
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15

Kolhatkar, Madhuri. "Web-mediated communication at workplace : a case study at US WEST Communications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0001/MQ43614.pdf.

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16

Wang, Shendi. "Efficient transmission design for machine type communications in future wireless communication systems." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23647.

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With a wide range of potential applications, the machine type communication (MTC) is gaining a tremendous interest among mobile network operators, system designers, MTC specialist companies, and research institutes. The idea of having electronic devices and systems automatically connected to each other without human intervention is one of the most significant objectives for future wireless communications. Low data rate transmission and the requirement for low energy consumption are two typical characteristics for MTC applications. In terms of supporting low cots MTC devices, industrial standar
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17

Byrne, Daniel Scott II. "A Technical Communication Internship With An eCRM Software Company: Synchrony Communications, INC." Miami University / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=miami1007737580.

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18

Holton, Carolyn F. "The impact of computer mediated communication systems monitoring on organizational communications content." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002440.

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19

Sen, Cem. "Digital communications jamming." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA383913.

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Thesis (M.S. in Systems Engineering) Naval Postgraduate School, Sept. 2000.<br>Thesis advisor(s): Smith, Rasler W.; Lebaric, Jovan. Includes bibliographical references (p. 137-139). Also available online.
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20

Wang, Tiejun. "Mobile OFDM communications." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3211276.

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Thesis (Ph. D.)--University of California, San Diego, 2006.<br>Title from first page of PDF file (viewed June 7, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 104-111).
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21

Michaels, Alan Jason. "Digital chaotic communications." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34849.

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This dissertation provides the conceptual development, modeling and simulation, physical implementation, and measured hardware results for a practicable digital coherent chaotic communication system. Such systems are highly desirable for robust communications due to the maximal entropy signal characteristics that satisfy Shannon's ideal noise-like waveform and provide optimal data transmission across a flat communications channel. At the core of the coherent chaotic communications system is a fully digital chaotic circuit, providing an efficiently controllable mechanism that overcomes the trad
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22

Danezis, George. "Better anonymous communications." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616002.

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23

Asbery, Christopher W. "SMART GRID COMMUNICATIONS." UKnowledge, 2012. http://uknowledge.uky.edu/ece_etds/10.

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Smart grid technologies are starting to be the future of electric power systems. These systems are giving the utilities detailed information about their systems in real time. One of the most challenging things of implementing smart grid applications is employing the communications into the systems. Understanding the available communications can help ease the transition to these smart grid applications. Many of the utility personnel are spending too much time trying to figure out which communication is better for their application or applications. So this thesis presents the different communica
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24

Giroudeau, Rodolphe. "ordonnancement et communications." Habilitation à diriger des recherches, Université Montpellier II - Sciences et Techniques du Languedoc, 2012. http://tel.archives-ouvertes.fr/tel-00797855.

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25

Simensen, Thor A. "Link-11 communications." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23945.

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26

Davies, Jonathan James. "Underwater acoustic communications." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289679.

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27

Biddiscombe, Martin David. "Free market communications." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325627.

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28

Морозова, Ірина Анатоліївна, Ирина Анатольевна Морозова, Iryna Anatoliivna Morozova, and M. I. Bilan. "Information communications technology." Thesis, Вид-во СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/22209.

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29

Bojko, C. "Ecology communications, inc." Thesis, Вид-во СумДУ, 2005. http://essuir.sumdu.edu.ua/handle/123456789/13369.

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30

Sheriff, Ray E., A. Donner, and A. Vanelli-Coralli. "Satellite Communications [Editorial]." Master's thesis, Hindawi Publishing Corporation, 2007. http://hdl.handle.net/10454/3488.

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Yes<br>We are delighted to bring to you this special issue on satellite communications, which we have prepared as part of the spreading of excellence remit of the satellite communications network of excellence (SatNEx). The SatNEx project, which began in 2004, is funded for five years under the European Union¿s Sixth Framework Programme (FP6) Information Society Technologies (IST) Thematic Area. Led by the German Aerospace Center, SatNEx brings together a network of 24 partners, distributed throughout Europe, with membership drawn from ten countries. The philosophy underlying the Sat
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31

Zou, Ding, and Ivan B. Djordjevic. "FPGA-Based Rate-Compatible LDPC Codes for the Next Generation of Optical Transmission Systems." IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2016. http://hdl.handle.net/10150/621685.

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In this paper, we propose a rate-compatible forward error-correcting (FEC) scheme based on low-density-parity check (LDPC) codes together with its software reconfigurable unified field-programmable gate array (FPGA) architecture. By FPGA emulation, we demonstrate that the proposed class of rate-compatible LDPC codes based on puncturing and generalized LDPC coding with an overhead from 25% to 46% provides a coding gain ranging from 12.67 to 13.8 dB at a post-FEC bit-error rate (BER) of 10(-15). As a result, the proposed rate-compatible codes represent one of the strong FEC candidates of soft-de
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32

Poirrier, Julien. "Electronic Mitigation of Polarization Mode Dispersion." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34469.

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Polarization Mode Dispersion induces polarization dependent propagation. Consequently it generates a multiple imaging of the light pulse carrying the information. Its first order appears as a dual path fading channel of Maxwellian statistics. It results in harmful impairments that prevent the upgrade and installation of high bit-rate systems. The random process PMD exhibits a strong frequency dependence, so that its amelioration requires channel by channel, non-linear, adaptive mitigation. Electronic mitigation appears as a very attractive solution to overcome the limit set by the PMD. Conseq
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33

Cournoyer, Ronald C. "Personal communications services : improving theater deployable communications for the 21st century." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA283465.

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Thesis (M.S. in Systems Technology (Command, Control, and Communications)) Naval Postgraduate School, June 1994.<br>Thesis advisor(s): Carl R. Jones, Dan C. Boger. "June 1994." Includes bibliographical references. Also available online.
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34

Gow, Gordon Albert. "New approaches to disaster communications, towards a global communications lifeline infrastructure." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24588.pdf.

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35

MacCallum, Irene F. "Effective communications, a study of manager/employee communications in an organization." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ49206.pdf.

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36

Link, Jeffrey P. "Design of a serial communication protocol and bus interface chip for tactile communications." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA362194.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, March 1999.<br>Thesis advisor(s): Douglas J. Fouts. "March 1999". Includes bibliographical references (p. 285). Also available online.
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37

Monaghan, Joseph Francis. "Evaluation of digital communications using the Marine Corps Communications Architecture Analysis Model." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23661.

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Approved for public release; distribution is unlimited<br>The United States Marine Corps (USMC) is currently evolving to digital communications. This change has created a need for an analysis tool capable of analyzing digital architectures. Traditional communications are being supplemented, and in some cases, replaced by automated systems like the Marine Tactical Command and Control System (MTACCS) Older equipment, the PRC-77 and AN/VRC-12 family of radios, is being replaced by lighter, more efficient equipment like SINCGARS and the Digital Communications Terminal (DCT). Protocols lik
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38

Taylor, Christine. "Project Manager Strategies for Strengthening Communications Within Project Teams." ScholarWorks, 2018. https://scholarworks.waldenu.edu/dissertations/6135.

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Communication inefficiencies are among the reasons for poor or substandard performances in project teams. The purpose of this multiple case study was to explore the strategies used by project managers in the health care industry to strengthen communication within project teams. The conceptual framework for the study was McQuail's mass communication theory and Craig's communication theory. Participants of the study were 4 project managers from 2 leading medical supply companies located in the mid-Atlantic region of the United States. Data were collected using semistructured interviews and a rev
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39

Neo, Soo Sim Daniel. "Free space optics communication for mobile military platforms." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FNeo.pdf.

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40

Borgmann, Moritz. "Noncoherent MIMO wideband communications /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17352.

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41

Larsson, Johannes. "Streamline Communications in Radiology." Thesis, Linköping University, Department of Computer and Information Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-17421.

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<p>The background to the study was Unified Communications (UC), defined as Communications integrated to optimize business processes. A case study design is used to develop a LoFi-prototype. The prototype investigateswhat components an integrated communication solution should provide,for the people in radiology. The design was inspired by consumer products likeSkype. In these consumer products were functionality and look studied. The reason for integrate it into Sectra MEI, was that Sectra believed the system’s features could be even more useful, when used together with a communication solution
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42

Purushothama, Rashmi. "MULTIPATH COMMUNICATIONS USING NAMES." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-90235.

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Increased host mobility, and multi-homing make IP address management very complex in applications. Due to host mobility, the IP address of a host may change dynamically, and also frequently. Multi-homing leads to multiple IP addresses for a single host. Name-based socket is a solution to address the complex IP address management. It relieves the applications from the overhead, and moves it to the operating system. It uses a constant name, instead of an IP address to establish a connection, thus allowing for the IP address changes during the course of the connection. The current implementation
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43

Eichhorn, Alexander Kühnhauser Winfried. "Content-aware multimedia communications /." Oslo : Unipub AS, 2008. http://www.gbv.de/dms/ilmenau/toc/570639581.PDF.

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44

Jiang, Xiaofeng. "Multipoint digital video communications." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239548.

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45

Goudevenos, Apostolos. "Through water electromagnetic communications." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494085.

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Underwater communications at high frequencies have a wide variety of applications including diving, military equipment, oil and gas exploration in offshore fields as well as oceanographic mapping. Wireless communications are much more practical than hardwire communications due to the nature of the ocean environment. Currently the most commonly applied method for underwater communications is acoustic communications but have some serious disadvantages. These include low data rate, shadowing and reflections. Optical fibre communications have been offered as a viable alternative but their use is l
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46

Xie, Xiaoling. "Communications in construction design." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/7571.

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Construction design has become an increasingly complex synthesis activity for which effective solutions depend upon co-operative participation by a number of people. Thus communication, including the integration of specialised knowledge and negotiation of differences between team members, is a vital process for collaborative design. A questionnaire survey was initially conducted to investigate communication issues and problems, which had been highlighted from a review of the literature, in current construction design. The results confirmed that communication among the different construction te
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47

Fay, Leon. "Equalizers for communications satellites." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45992.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.<br>Includes bibliographical references (p. 57).<br>This thesis investigates equalization for advanced protected satellite communications systems in development at MIT Lincoln Laboratory. Equalizers facilitate high data rate communication by correcting dispersion in the transmitter and receiver signal chains. An automated calibration procedure for finding optimal equalizers was developed. Repeated testing addressed questions about noise amplification, filter complexity requiremen
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48

Olayiwola, Rahman Olalekan. "Political communications in Nigeria." Thesis, London School of Economics and Political Science (University of London), 1991. http://etheses.lse.ac.uk/1089/.

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This study of the Nigerian Political Communications examines the patterns of mass media ownership and their impact on the coverage of selected national issues - the census controversy, ethnic problems and the general elections of 1979 and 1983. The contents of 21 newspapers of variegated ownership pattern involving governments, partisan and private interests are analysed and "live" illustrations of stories are given. This is to demonstrate empirically the thesis argument that the criterion of ownership is the key factor which determines how the Nigerian mass media are used for moulding the cit
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49

Jones, David Blodgett. "Directiveness in promotional communications." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/77808.

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The style of a communication may influence a receiver's responses as well as the message's factual, informational content. The degree to which a promotional communication attempts to control a receiver's responses can be defined as a relational and therefore a stylistic variable. This dissertation operationalizes a stylistic variable, directiveness, as the degree to which a persuasive communication instructs the receiver how to respond in terms of action, attitudes and beliefs. Directive messages attempt to limit the receiver's responses while less directive or suggestive messages encourage th
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50

Milosavljevic, Ivana. "Power Electronics System Communications." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31218.

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This work investigates communication issues in high-frequency power converters. A novel control communication network (Power Electronics System Network or PES Net) is proposed for modular, medium and high-power, converters. The network protocol, hardware and software are designed and implemented. The PES Net runs at 125 Mb/s over plastic optical fiber allowing converter switching frequencies in excess of 100 kHz. Communication control is implemented in a field programmable gate array device. A novel synchronization method applicable to ring networks is proposed. The effect of the communication
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