Dissertations / Theses on the topic 'Multimedia communication and networking'
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Yang, Yin-Wei. "Online multimedia communication system." CSUSB ScholarWorks, 2005. https://scholarworks.lib.csusb.edu/etd-project/2661.
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Online Multimedia Communication System is a project aimed at providing people the ability to store and share their multimedia files. The users and administrator can modify and view the files and database information from a normal web browser. Furthermore, this site offers a secure environment to keep all the users' information private.
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Sadat, Mohammad Nazmus. "QoE-Aware Video Communication in Emerging Network Architectures." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin162766498933367.
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Chassot, Christophe. "Architecture de transport multimedia à connexions d'ordre partiel." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 1995. http://tel.archives-ouvertes.fr/tel-00145820.
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Les travaux présentés dans ce mémoire ont pour cadre la recherche de nouveaux services et protocoles de Transport, aptes à supporter le transfert de données multimédia en tenant compte des exigences applicatives en termes de hauts débits et de synchronisation. L'approche proposée repose sur la définition et le développement d'un nouveau concept: la connexion d'ordre partiel (POC - Partial Order Connection), établissant un lien conceptuel entre les modes de service/protocole orientés-connexion tels que TCP, et sans connexion tels que UDP. Une POC est une connexion de bout en bout permettant de définir et de mettre en œuvre tous les services et protocoles d'ordre partiel entre deux entités communicantes ; dans une POC, la délivrance des données à l'utilisateur récepteur peut être effectuée dans un ordre différent de l'ordre de soumission de ces données par l'utilisateur émetteur: la différence (acceptable) entre ces deux ordres résulte de la définition, par l'utilisateur, d'un ordre partiel de délivrance lors de l'ouverture de la connexion. Une formalisation des mécanismes correspondants est proposée au moyen de la technique de description formelle Estelle. Les caractéristiques intrinsèques des différents média d'un flux multimédia ont conduit ces dernières années au développement d'architectures de communication intégrant la prise en compte des contraintes applicatives à différents niveaux conceptuels, et notamment au niveau Transport du modèle OSI ; à partir d'une modélisation de ces contraintes utilisant le formalisme des réseaux de Petri (le modèle TSPN), l'auteur propose d'intégrer le concept de POC dans une architecture de Transport multimédia autorisant une prise en compte globale des contraintes d'ordre et de fiabilité d'un flux multimédia. Les mécanismes de gestion de l'ordre et de la fiabilité qui sont proposés permettent de définir un service de Transport multimédia offrant une hypothèse nouvelle aux utilisateurs vis à vis de la problématique de la synchronisation. Une étude de la faisabilité d'un protocole multimédia d'ordre partiel à l'aide des procédures XTP est finalement présentée: elle conclut en la possibilité d'une telle réalisation
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Shakya, Rosish. "Optimal Placement of Video Caching Routers for Minimization of Retransmission Delay." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1306429551.
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Tosun, Ali Saman. "Security mechanisms for multimedia networking." Columbus, OH : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1054700514.
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Thesis (Ph. D.)--Ohio State University, 2003.Title from first page of PDF file. Document formatted into pages; contains xvi, 135 p.: ill. Includes abstract and vita. Co-advisors: Wu-Chi Feng, Dong Xuan, Dept. of Computer ad information Science. Includes bibliographical references (p. 129-135).
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Guenkova-Luy, Teodora. "Multimedia networking coordination of multimedia services in next generation mobile networks." Saarbrücken VDM, Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3037222&prov=M&dok_var=1&dok_ext=htm.
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Denney, Justin. "Multimedia Delivery Services for Highly Heterogeneous Networking Environments." Thesis, Lancaster University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.514416.
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Lunn, Andrew Stuart. "A mini cell architecture for multimedia systems." Thesis, Lancaster University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337352.
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Moore, Mary. "Digital networking, using new communication technologies to facilitate networking among NGOs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0005/MQ42085.pdf.
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Toni, Laura <1982>. "Adaptive wireless multimedia communication systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2117/.
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In recent years, due to the rapid convergence of multimedia services, Internet and wireless communications, there has been a growing trend of heterogeneity (in terms of channel bandwidths, mobility levels of terminals, end-user quality-of-service (QoS) requirements) for emerging integrated wired/wireless networks. Moreover, in nowadays systems, a multitude of users coexists within the same network, each of them with his own QoS requirement and bandwidth availability. In this framework, embedded source coding allowing partial decoding at various resolution is an appealing technique for multimedia transmissions. This dissertation includes my PhD research, mainly devoted to the study of embedded multimedia bitstreams in heterogenous networks, developed at the University of Bologna, advised by Prof. O. Andrisano and Prof. A. Conti, and at the University of California, San Diego (UCSD), where I spent
eighteen months as a visiting scholar, advised by Prof. L. B. Milstein and Prof. P. C. Cosman. In order to improve the multimedia transmission quality over wireless channels, joint source and channel coding optimization is investigated in a 2D time-frequency resource block for an
OFDM system. We show that knowing the order of diversity in time and/or frequency domain can assist image (video) coding in selecting optimal channel code rates (source and channel code rates). Then, adaptive modulation techniques, aimed at maximizing the spectral efficiency, are investigated as another possible solution for improving multimedia transmissions. For both slow and fast adaptive modulations, the effects of imperfect channel estimation errors are evaluated, showing that the fast technique, optimal in ideal systems, might be outperformed by the slow adaptive modulation, when a real test case is considered. Finally, the effects of co-channel interference and approximated bit error probability (BEP) are evaluated in adaptive modulation techniques, providing new decision regions concepts, and showing how the widely used BEP
approximations lead to a substantial loss in the overall performance.
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Tovslid, Magnus Jeffs. "JPEG 2000 Quality Scalability in an IP Networking Scenario." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18465.
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In this thesis, the JPEG 2000 quality scalability feature was investigated in thecontext of transporting video over IP networks. The goals of the investigation wastwo-fold. First, it was desired to nd a way of choosing the number of quality layersto embed in a JPEG 2000 codestream. In previous work, this choice has been moreor less arbitrary. Second, it was desired to nd how low the video bitrate could bedropped before it became perceptible to a viewer. This information can be usedin an IP networking scenario to e.g. adapt the video bitrate blindly according tothe measured channel capacity as long as the drop in bitrate is expected to beimperceptible. When the drop in bitrate is expected to be perceptible, a switchcould be made to a smoother bitrate adaptation.A way of choosing the total number of quality layers to embed in a codestreamwas found by minimizing the dierence in predicted quality between direct andscaled compression. Scaled compression is the compression which is achieved byextracting quality layers. The minimization procedure was bound by the speed ofthe encoder, as it takes longer for an encoder to embed more quality layers. It wasfound that the procedure was highly dependent on the desired bitrate range.A subjective test was run in order to measure how large a drop in video bitrate hadto be for it to become perceptible. A newly developed JPEG 2000 quality layerscaler was used to produce the dierent bitrates in the test. The number of qualitylayers to embed in codestream was found by using the minimization procedurementioned above. It was found that, for the bitrate range used in the test, 2 - 30Mbits/s for a resolution of 1280x720 at 25 frames per second, the magnitude ofthe drop in bitrate had to be at least 10 Mbits/s before the participants in the testnoticed it. A comparison with objective quality metrics, SSIM and PSNR, revealedthat it was very dicult to predict the visibility of the drops in bitrate by usingthese metrics. Designing the type of rate control mentioned in the rst paragraphwill therefore have to wait until a parameter with good predictive properties canbe found.
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Dogan, Safak. "Video transcoding for multimedia communication networks." Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/843006/.
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Video transcoding is a generic name for a video gateway structure whereby the tandeming process does not involve any high complexity cascaded decoding and re-encoding operations in contrast to the existing conventional solutions. Diverse multimedia communication network characteristics, such as bandwidth limitations and varying congestion conditions, incur quality degradation in video transmissions. The matching of input and output network constraints and characteristics is possible with video transcoding at a centralised unit within the network. Moreover, video transcoding also provides a suitable translation mechanism for different video compression standards achieving a transparent interconnection between diverse network topologies. In addition, video transcoding offers a method for providing robustness against transmission error effects which occur during the transmission of compressed video streams over highly bandwidth- restricted communication media, such as popular mobile-wireless networks. Due to the severe bandwidth restrictions of such networks, the video signals require low bit rate coding which in turn renders video streams highly susceptible to radio channel errors. Therefore, error-resilient operations also need to be provided together with the syntax and transmission rate translation features of video transcoders. The unique features of video transcoding provide flexible and efficient ways to alleviate the previously addressed three major issues for various requirements. These requirements can be imposed by the diversity of networks on which numerous applications are running or by different standards themselves as well as by a wide range of users. This is strictly related to a universal interoperability issue of heterogeneous characteristics and requirements which demand effective end-to-end solutions. Thus, the aim of this research presented in this thesis is to develop algorithms for the provision of such remedial solutions to the interoperability problem. In the light of these facts, the research work focuses on the design of various video transcoding algorithms. The objectives of these algorithms are to ease network congestion and/or user bandwidth limitation conditions, support essential standard conversions between different compression schemes and provide necessary error robustness over highly error-prone transmission media, such as mobile radio networks. The ultimate target is to establish a common platform where all the above three aims are successfully satisfied. Extensive computer simulations demonstrate the effectiveness of the proposed and designed systems, throughout the course of the research work. These simulations are assessed with the use of objective and subjective performance measures.
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Kristiansson, Johan. "On technologies for ubiquitous multimedia communication." Doctoral thesis, Luleå : Division of Information and Communication Technology, Luleå University of Technology, 2006. http://epubl.ltu.se/1402-1544/2006/44/.
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Stark, Gavin John. "Stream handling in multimedia communication systems." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311054.
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Hou, Yuen Tan. "Resource management in multimedia communication systems." HKBU Institutional Repository, 2003. http://repository.hkbu.edu.hk/etd_ra/478.
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Merle, Carol Van Diemel. "Innovative networking : the synergy between the public relations industry and multimedia newspaper." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/2307.
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Thesis (MTech (Public Relations Management))--Cape Peninsula University of Technology, 2011.The purpose of this mini thesis is to investigate the research question, "What is the importance and effectiveness of public relations practice in obtaining coverage in a multimedia newspaper?" It is obvious that the introduction of the multimedia newspaper has affected the role of the public relations practitioner and the role of the journalists. But has it changed the manner in which public relations practitioners practice public relations (that is the influence of the multimedia newspaper on the public relations industry) and its value in the eyes of the multimedia journalist. The study will measure the multimedia editorial staff's opinion and perceptions of the multimedia newspapers content and public relations practice's impact on that content. The research is interested in whether the introduction of the multimedia newspaper has affected the role of the public relations practitioner and the journalists and whether it has changed the manner in which public relations practitioners practice public relations (that is the influence of the multimedia newspaper on the public relations industry). The research reviews the perceived value of public relations to journalists operating within the multimedia newspaper context.
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Samain, Jacques. "Improving quality of experience in multimedia streaming by leveraging Information-Centric Networking." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT012/document.
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Les réseaux centrés sur l’information (ICN) sont une architecture prometteuse pour faire face à l’explosion du trafic multimédia sur internet et à la mobilité croissante des utilisateurs: non seulement ICN peut améliorer la qualité d’expérience de l’utilisateur, mais ICN peut également étendre naturelle et de façon transparente la prise en charge du trafic vidéo dans les fonctions réseau. Cependant, à notre connaissance, une évaluation approfondie des avantages apportés par ICN à la diffusion multimédia n’a pas encore été réalisée. Dans cette thèse, nous voulons réduire l’écart qui nous sépare d’une telle évaluation en prenant en compte ICN dans divers scénarios de diffusion multimédia.Tout d’abord, nous évaluons les avantages apportés par du DAS (Dynamic Adaptive Streaming) basé sur ICN par rapport au streaming basé sur TCP/IP, au moyen d’une campagne expérimentale comprenant plusieurs canaux (des émulations Wi-Fi et LTE, des traçes 3G/4G), plusieurs clients (mélange homogène et hétérogène, arrivées synchrones et asynchrones) et des logiques d’adaptation DAS soigneusement sélectionnées pour couvrir les deux grandes familles d’algorithmes disponibles. Nous mettons aussi enexergue les pièges potentiels qui sont néanmoins facilement évitables.Ensuite, nous montrons comment l’assistance du réseau contribue à améliorer la qualité d’expérience des utilisateurs. Pour ce faire, nous tirons parti de la fonctionnalité de mise en cache réseau d’ICN et proposons un signal re ́seau simple envoyé périodiquement par le cache à exploiter par l’algorithme d’adaptation DAS pour optimiser la qualité d’expérience de l’utilisateur en évitant le phénomène bien connu des oscillations induites par le cache. Des expériences nous permettent de valider le bien-fondé de notre approche.Enfin, puisque la diffusion multimedia en direct gagne du terrain, nous proposons hICN-RTC, en intégrant hICN (hybrid ICN), une solution ICN-dans-IP, à WebRTC, accompagné du protocole RICTP (Realtime Information Centric Transport Protocol), un protocole de transport basé sur le contenu, qui minimise la latence. Bien que toujours en développement, les résultats des premières expériences sont prometteurs car ils montrent que le trafic induit par hICN-RTC ne croit qu’avec le nombre de locuteurs actifs plutôt qu’avec le nombre total de participantsInformation-Centric Networking (ICN) is a promising architecture to address today Internet multimedia traffic explosion and increasing user mobility: not only to enhance the user’s quality of experience, but also to naturally and seamlessly extend video sup- port deeper in the network functions. However, to the best of our knowledge, a thorough assessment of the benefits brought by ICN to multimedia delivery has not been done yet. In this thesis, we aim at reducing the gap to such assessment, by considering ICN in various multimedia delivery scenarios.First, we assess the benefits brought by an ICN-based Dynamic Adaptive Streaming (DAS) compared to TCP/IP based streaming, by means of an experimental campaign that includes multiple channels (e.g., emulated Wi-Fi and LTE, real 3G/4G traces), multiple clients (homogeneous vs heterogeneous mixture, synchronous vs asynchronous arrivals) and carefully selected DAS adaptation logics to cover the broad families of available adaptation algorithms. We also warn about potential pitfalls that are nonethelesseasily avoidable.Second, we show how network assistance helps im- proving the users’ quality of experience. To do so, we leverage the in-network caching feature of ICN and propose a simple periodical network signal from the cache (i.e., per-quality hit ratio) to be exploited by DAS adaptation logic to enhance further the user’s quality of experience by avoiding the known cache-induced quality oscillations. We confirm the soundness of our approach through experiments.Finally, as live multimedia delivery is gaining momentum, we propose hICN-RTC by integrating hICN (hybrid ICN), an ICN-in-IP solution, to WebRTC and we design RICTP (Realtime Information Centric Trans- port Protocol), a content-aware transport that minimizes the communication latency. Although still in development, the results we gathered from early experiments are promising as they show that hICN-RTC scales with the number of active speakers rather than the total number of participants
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Chisalita, Ioan. "Communication and Networking Techniques for Traffic Safety Systems." Doctoral thesis, Linköping : Department of Computer and Information Science, Linköpings universitet, 2006. http://www.bibl.liu.se/liupubl/disp/disp2006/tek1018s.pdf.
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Garlapati, Shravan Kumar Reddy. "Enabling Communication and Networking Technologies for Smart Grid." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/56629.
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Transforming the aging electric grid to a smart grid is an active area of research in industry and the government. One of the main objectives of the smart grid is to improve the efficiency of power generation, transmission and distribution and also to improve the stability and the reliability of the grid. In order to achieve this, various processes involved in power generation, transmission, and distribution should be armed with advanced sensor technologies, computing, communication and networking capabilities to an unprecedented level. These high speed data transfer and computational abilities aid power system engineers to obtain wide area measurements, achieve better control of power system operations and improve the reliability of power supply and the efficiency of different power grid operations.
In the process of making the grid smarter, problems existing in traditional grid applications can be identified and solutions have to be developed to fix the identified issues. In this dissertation, two problems that aid power system engineers to meet the above mentioned smart grid's objective are researched. One problem is related to the distribution-side smart grid and the other one is a part of the transmission-side smart grid. Advanced Metering Infrastructure (AMI) is one of the important distribution-side smart grid applications. AMI is a technology where smart meters are installed at customer site which gives the utilities the ability to monitor and collect information related to the amount of electricity, water, and gas consumed by the user.
Many recent research studies suggested the use of 3G cellular CDMA2000 for AMI network as it provides an advanced and cost effective solution for smart grid communications. Taking into account both technical and non-technical factors such as extended lifetime, security, availability and control of the solution, Alliander, an electric utility in Netherlands deployed a private 3G CDMA2000 network for smart metering. Although 3G CDMA2000 satisfies the requirements of smart grid applications, an analysis on the use of the current state of the art 3G CDMA2000 for smart grid applications indicates that its usage results in high percentage of control overhead, high latency and high power consumption for data transfer. As a part of this dissertation, we proposed FLEX-MAC - a new Medium Access Control (MAC) protocol that reduces the latency and overhead in smart meter data collection when compared to 3G CDMA2000 MAC.
As mentioned above the second problem studied in this dissertation is related to the transmission-side grid. Power grid transmission and sub-transmission lines are generally protected by distance relays. After a thorough analysis of U.S. historical blackouts, North American Electric Reliability Council (NERC) has concluded that the hidden failure induced tripping of distance relays is responsible for 70% of the U.S. blackouts. As a part of this dissertation, agent based distance relaying protection scheme is proposed to improve the robustness of distance relays to hidden failures and thus reduce the probability of blackouts.
This dissertation has two major contributions. First, a hierarchically distributed non-intrusive Agent Aided Distance Relaying Protection Scheme (AADRPS) is proposed to improve the robustness of distance relays to hidden failures. The problem of adapting the proposed AADRPS to a larger power system network consisting of thousands of buses is modeled as an integer linear programming multiple facility location optimization problem. Distance relaying protection scheme is a real time system and has stringent timing requirements. Therefore, in order to verify if the proposed AADRPS meets the timing requirements or not and also to check for deadlocks, verification models based on UPPAAL real time model checker are provided in this dissertation. So, the entire framework consisting of AADRPS that aids in increasing the robustness of distance relays and reducing the possibility of blackouts, the multiple facility location optimization models and the UPPAAL real time model checker verification models form one of the major contributions of this dissertation.
The second contribution is related to the MAC layer of AMI networks. In this dissertation, FLEX-MAC - a novel and flexible MAC protocol is proposed to reduce the overhead and latency in smart meter data collection. The novelty of the FLEX-MAC lies in its ability to change the mode of operation based on the type of the data being collected in a smart meter network. FLEX-MAC employs Frame and Channel Reserved (FCR) MAC or Frame Reserved and Random Channel (FRRC) MAC for scheduled data collection. Power outage data in an AMI network is considered as a random data . In a densely populated area, during an outage, a large number of smart meters attempt to report the outage, which significantly increases the Random Access CHannel (RACH) load. In order to reduce the RACH traffic during an outage, this dissertation proposes a Time Hierarchical Scheme (THS). Also, in order to minimize the total time to collect the power outage data, a Backward Recursive Dynamic Programming (BRDP) approach is proposed to adapt the transmission rate of smart meters reporting an outage. Both the Optimal Transmission Rate Adaption and Time Hierarchical Scheme form the basis of OTRA-THS MAC which is employed by FLEX-MAC for random data collection. Additionally, in this work, Markov chain models are presented for evaluating the performance of FCR and FRRC MACs in terms of average throughput and delay. Also, another Markov model is presented to find the mean time to absorption or mean time to collect power outage data of OTRA-TH MAC during an outage.Ph. D.
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Sweeney, Matthew. "Interpersonal communication on Myspace: A social networking study." Thesis, Sweeney, Matthew (2007) Interpersonal communication on Myspace: A social networking study. Honours thesis, Murdoch University, 2007. https://researchrepository.murdoch.edu.au/id/eprint/53031/.
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As Web 2.0 emerges, Internet users realise a new degree of self-publication through blogs, wikis and social networking sites. The inherent sociality of social networking sites (SNS) has led to exponential growth of internet use, especially amongst teens. The rapid increase in use of these sites poses questions of why do people use these sites? Who are they communicating with? Why are they communicating with the each other? Interpersonal interactions on SNS are a departure from traditional computer-mediated communication (CMC) interactions due to the public articulation of friends and communication with these friends. As social networking sites are at the forefront of many-to-many mass communication technologies, it is important to understand the interpersonal communication that takes place through these media and what influences these communication behaviours. Myspace, the most popular SNS has not yet been encountered in Uses and Gratifications (U&G) research or communication research. The proposed research aims to bridge this gap, adding to existing research in interpersonal communication, identity and friendship performance theory and extending U&G theory to a new environment, SNS. Answers to the research questions can lead to a clear understanding of social networking sites as a new communication tool and its application in the lives of its users and the wider society.
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Tate, William R. "Full-duplex underwater networking." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FTate.pdf.
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Brown, Herbert Franklin III. "Students' performance on a paper-mediated versus multimedia tutorial for learning networking concepts." Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/40324.
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This study was designed to determine the degree to which learner affective and personal characteristics affect student achievement through multimedia and paper-mediated
instruction. Two research questions were examined: (a) Is there a difference in gain between pretest and post test for the paper-mediated instruction group and the multimedia instruction group; (b) What is the effect of paper-mediated and multimedia instruction on achievement, when controlling for affective and personal characteristics? The statistical procedures used to examine the research questions were dependent t-tests and analysis of covariance.
Participants were 61 students from four classes enrolled in introductory computer classes in a high school in the Roanoke region of Virginia. The classes were randomly assigned to either a paper-mediated or multimedia treatment. Procedures involved having the participants from both groups complete five stages, either on paper or on the computer, based on group assignment. First, they completed a personal characteristics form. Second, they completed an attitude toward computers Likert-type scale, consisting of four subscales (anxiety, confidence, liking, usefulness). Third, they completed a 20-question pretest on networking terminology. Fourth, they reviewed instructional material in either a paper or multimedia presentation form. Upon completion of the paper or multimedia computer tutorial, the participants completed a 20-item posttest on networking terminology.
Based on the results of two dependent t-tests on the pretest and posttest for each
treatment group, students did realize a gain in achievement from the pretest to posttest in
both groups. In testing research question two, the analysis of covariance revealed a
significant treatment effect and gender as a significant covariate. Students in the paper-mediated group performed better than those in the multimedia group. Females performed
higher regardless of the treatment group.Ph. D.
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Kim, Taehyun. "Scalable Video Streaming over the Internet." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6829.
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The objectives of this thesis are to investigate the challenges on video streaming, to explore and compare different video streaming mechanisms, and to develop video streaming algorithms that maximize visual quality. To achieve these objectives, we first investigate scalable video multicasting schemes by comparing layered video multicasting with replicated stream video multicasting. Even though it has been generally accepted that layered video multicasting is superior to replicated stream multicasting, this assumption is not based on a systematic and quantitative comparison. We argue that there are indeed scenarios where replicated stream multicasting is the preferred approach.
We also consider the problem of providing perceptually good quality of layered VBR video. This problem is challenging, because the dynamic behavior of the Internet's available bandwidth makes it difficult to provide good quality. Also a video encoded to provide a consistent quality exhibits significant data rate variability. We are, therefore, faced with the problem of accommodating the mismatch between the available bandwidth variability and the data rate variability of the encoded video. We propose an optimal quality adaptation algorithm that minimizes quality variation while at the same time increasing the utilization of the available bandwidth.
Finally, we investigate the transmission control protocol (TCP) for a transport layer protocol in streaming packetized media data. Our approach is to model a video streaming system and derive relationships under which the system employing the TCP protocol achieves desired performance. Both simulation results and the Internet experimental results validate this model and demonstrate the buffering delay requirements achieve desired video quality with high accuracy. Based on the relationships, we also develop realtime estimation algorithms of playout buffer requirements.
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Nicolaou, Cosmos Andrea. "A distributed architecture for multimedia communication systems." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385935.
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Nazir, Sajid. "Multimedia communication over mobile IP wireless networks." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=17816.
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The use of Internet Protocol (IP) based mobile wireless transmission is increasing as novel multimedia applications are being deployed. Mobile wireless channels and IP based communications are inherently prone to errors and packet losses. Error resilience features and Forward Error Correction (FEC) at the application layer (AL) are often used to protect the video data against losses. The amount of redundancy added by the FEC attempts to counter the worst channel Signal-to-noise-ratio (SNR) but the protection generally comes at a high complexity and overhead. It is thus imperative to design FEC solutions which are adaptive to the varying wireless channel conditions, i.e., bandwidth and packet loss rate. This adaptive behaviour becomes even more important for transmission to heterogeneous receivers. Fountain codes are rateless codes which can be used to potentially generate an unlimited number of encoded packets from a limited number of source packets. The decoding is possi ble if the number of received encoded packets at the receiver is just a little more than the source packets. As each portion of encoded video data does not have equal importance for the video re-construction, this characteristic can also be advantageously exploited while designing FEC solutions by providing more protection to important portions. Random linear codes (RLC) based schemes have been compared with Raptor codes, and RLC solution is proposed for the mobile television broadcasting standards like Digital Video Broadcasting-Handheld (DVB-H) and DVB-T2 (Second Generation Terrestrial). A reliable unicast video communication solution based on Luby Transform (LT) codes is proposed by exploiting unequal error protection (UEP) for encoded video data partitioned with the Data partitioning (DP) and slicing feature of H264/AVC. A comparison of layered video data transmission with Amplify-and-Forward (AF) and Decode-and-Forward (DF) relay collaboration strategies is provided. A novel scheme for multiple description coding (MDC) has been proposed and its advantages highlighted through simulations over relay based multi hop channels, like Long Term Evolution- Advanced (LTE-A). An algorithm has been proposed which takes into account the PSNR contribution and temporal significance of each slice to prioritize H.264/AVC sliced video data. The simulation results with systematic RLC show the usefulness of the proposed scheme for applications such as video-on-demand (VoD).
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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 received video quality after transmission over error prone environments is developed. The quality estimation is based on a distortion model, which accurately models the overall distortion seen in decoder frame reconstruction. This includes quantisation distortion, concealment distortion, and error propagation. Based on the developed performance model, optimum MTU (Maximum Transfer Unit) size for efficient wireless video communications over a packet switched access network is derived. The second part of the thesis investigates quality enhancement techniques for multimedia traffic transmitted over wireless channels. Quality enhancement is achieved at three levels of the transmission process: link level, application level and system level. Link level quality enhancement techniques are designed to optimise the allocation of link level parameter values according to the media characteristics. A novel Unequal Error Protection scheme and a novel Unequal Power Allocation scheme are designed to exploit the inherent diversity in the subjective importance of different sections of compressed media. The algorithms are developed and analysed for transmission of video over 3G wireless systems. The effectiveness of these algorithms is demonstrated through the results of simulated transmission over a UMTS channel. Application level quality enhancement techniques are designed to explore the time-varying nature of the wireless channel. A number of link adaptation schemes are proposed for real time video communication and real-time video streaming over 3G wireless systems. These algorithms are designed to enhance the perceptual video quality, and the system utilisation. This is achieved by adapting the allocated radio network parameters and the source parameters, according to a feedback channel condition. Simulation results show a significant performance improvement compared to non-adaptive schemes. Finally, system level adaptation techniques are designed for efficient radio resource allocation in multi-user scenarios. Two adaptive resource allocation schemes are proposed and analysed for real-time video communications in a UMTS system. The proposed algorithms are shown to provide improved performances in terms of average received video quality and user satisfaction. Key words: Wireless Communication, Multimedia communication. Video Transmission.
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Alapati, Venkata Somi Reddy. "A New Scheduling Algorithm for Multimedia Communication." Thesis, University of North Texas, 1995. https://digital.library.unt.edu/ark:/67531/metadc277951/.
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The primary purpose of this work is to propose a new scheduling approach of multimedia data streams in real-time communication and also to study and analyze the various existing scheduling approaches.
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Begen, Ali C. "Enhancing the Multimedia Experience in Emerging Networks." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14010.
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As multimedia processing and networking technologies, products and services evolve, the number of users communicating, collaborating and entertaining over the IP networks is growing rapidly. With the emergence of pervasive and ubiquitous multimedia services, this proliferation creates an abundant increase in the amount of the Internet backbone traffic. This brings the problem of efficient transmission of real-time and time-sensitive media content to the fore. Effective multimedia services demand appropriate application-specific and media-aware solutions, without which the full benefits of such services will not be realized. Poor approaches often lead to system performance degradations such as unacceptable presentation quality perceived by the users, possible network collapses due to the high-bandwidth nature of the multimedia applications, and poor performance observed by other data-oriented applications due to the unresponsiveness of multimedia flows.
From a networking perspective, traditional approaches consider the application data as "sacred" and do not differentiate any part of it from the rest. While this keeps the data-delivery mechanisms, namely, the transport-layer protocols, as plain as possible, it also precludes these mechanisms from interpreting the media content and tailoring their actions according to the importance of the content. Given that this naive approach cannot satisfy the specific needs of each and every one of the today's emerging applications ranging from videotelephony to video-on-demand, from distance education to telemedicine, from remote surveillance to online video gaming, the study of Multimedia Transport Protocols (MMTP) is overdue.
An MMTP solution basically integrates the multimedia content information into the responsible data-delivery mechanisms along with the requirements of the invoking application and network characteristics to deliver the highest level of service quality. In other words, an MMTP solution offers a unified environment where all cooperating protocol components interact with each other and make the best use of this collaboration to fulfill their respective duties. The focus of this thesis is on the design and evaluation of a set of end-to-end and system-level MMTP solutions for scalable, reliable, and high quality multimedia services in ever-changing, complex and heterogeneous computing and communication environments.
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Chung, Edward Chi-Fai. "Quality of service analysis for distributed multimedia systems in a local area networking environment." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1174610545.
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Eljarn, Hatana Hannan. "Computer mediated communication, social networking sites & maintaining relationships." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/computer-mediated-communication-social-networking-sites-and-maintaining-relationships(14a3c8f9-a6a7-4acd-833f-42b4c9b9bc7d).html.
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The past decade has witnessed a proliferation of internet use for socialising with dedicated websites such as Facebook, and also for maintaining relationships using computer mediated communication. Individuals can extend the boundary associated with traditional forms of communication, and use technology to meet strangers online to share interests, or maintain existing relationships remotely. One of the most significant functions of computer-mediated communication (CMC) is its contribution to the evolution of social communication. CMC is “communication that takes place between human beings via the instrumentality of computers” (Thurlow, Lengel, & Tomic, 2004). As a consequence of the convenience and flexibility that this channel provides, CMC can be effectively used to orchestrate a variety of communication situations. Furthermore, social networks sites are becoming the choice in which individuals are maintaining relationships or meeting new people. The potential distinctions between these relationships and their offline counterparts remain contradictory. Online relationships may face different challenges, such as anonymity, restricted interaction (Walther, 1992), and the lack of physical presence. For example, sharing activities online such as playing games or visiting Web sites together differs from offline activities, such as going to the movies or dining together. These observations question whether CMC relationships have any parallels with real world relationships. Dunbar (1992) structured real world relationship by strength of ties and formulated the social brain hypothesis (SBH). This work uses the SBH as an interpretive lens in analyzing CMC relationship ties. Thus, a major focus of this work is to investigate implications of the SBH (Dunbar, 1992) within the context of CMC usage. It is recognised that CMC allows for the maintenance of a large number of friendships. Thus potentially, the use of CMC could alter the SBH ratios. Within the main findings consistency with SBH was found. Furthermore, CMC has many parallels with real world communication methods. Face-to-face communications were strongly preferred for maintenance of strong ties. Also phone usage was analysed and identified as an indicator of strong tie relationships, for both local and distant communications. The findings also address questions on displaced communities communication habits and their use of CMC. The phone was found to be most popular media and culture had a strong influence on communication content. The research used a mixed method approach, combining data collection via questionnaires, semi structured interviews and a diary study completed by participants. Based on the findings, a framework is proposed categorising groups on their level of real world socialising and CMC use. There are four essential contributions impacting on current theory. The findings offer new knowledge within the research of CMC and relationship maintenance theory. In our understanding these exploratory questions have not yet been addressed and therefore the findings of this research project are significant in their contributions.
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Peterson, Dwight M. "Communication System Applications for Shipboard Data Collection and Networking." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/611426.
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International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, CaliforniaThe assessment of weapons and combat system performance requires the collection and networking of data from shipboard and land based locations. New programs being introduced and tested, such as the Cooperative Engagement Capability, Theater Ballistic Missile Defense, and All Service Combat Identification Evaluation Team, generate gigabytes of data which must be reduced, transferred, and analyzed. Test conductors, headquarters personnel, and military commanders require analysis results in near real time to evaluate system performance during a test or exercise. This paper will discuss communication system applications for shipboard data collection and networking to collect, reduce, and transfer the large amounts of data generated during current and planned Navy and Joint exercises. Examples of using 56 Kbit/Second International Maritime Satellite, range based line-of-sight networking, and integrated workstation applications will be addressed and lessons learned shared from actual installation and use.
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Hahm, Oliver. "Enabling Energy Efficient Smart Object Networking at Internet-Scale : Experimental Tools, Software Platform, and Information-Centric Networking Protocols." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX090/document.
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L'Internet des Objets a pour but d'intégrer des milliards d'objets connectés dans l'Internet.Du point de vue matériel, ces objets connectés sont de petits ordinateurs très bon marché, basés sur des micro-contrôleurs et des puces radio efficaces en énergie apparus récemment, couplés avec des capteurs et actionneur divers, le tout alimenté par une batterie de très petite taille.Ces objets connectés sont donc typiquement très contraints en ressources telles que CPU, mémoire et énergie.De plus, les liens radio à travers lesquels communiquent les objets connectés ont une capacité très limitée, sont souvent sujet à des taux de perte importants, et peuvent requérir du routage spontané entre objets connectés pour fournir la connectivité nécessaire.Ces caractéristiques posent des défis, d'une part en termes de logiciel embarqué s'exécutant sur les objets connectés, et d'autre part en termes de protocols réseaux utilisés par les objets connectés pour communiquer.En conséquence, de nouvelles méthodes et outils expérimentaux sont nécessaires pour étudier in vivo les réseaux formés d'objets connectés, de nouvelles plateformes logicielles sont nécessaires pour exploiter efficacement les objets connectés, et des protocoles de communication innovants sont nécessaire pour interconnecter ces objets.La présente thèse relève en partie ces défis, en introduisant des nouveaux outils facilitant l'utilisation de grands réseaux test interconnectant de nombreux objets connectés, un nouveau système d'exploitation (RIOT) utilisable sur une très grande variété d'objets connectés, ainsi que plusieurs nouveaux mécanismes utilisant le paradigme des réseaux centrés contenus pour améliorer significativement l'efficacité énergétique des protocoles de communication standards de l'Internet des ObjetsThe Internet of Things aims to seamlessly integrate billions of so-called Smart Objects into traditional Internet infrastructures.From the hardware perspective, Smart Objects emerged when tiny, cheap computers became available, combining energy efficient micro-controllers, low-power radio transceivers, and sensors as well as actuators interacting with the physical world, often powered by batteries.Typically, Smart Objects are thus heavily constrained in terms of CPU, memory and energy resources.Furthermore, wireless links used for communication among Smart Objects or towards the Internet are often slow, subject to high packet loss, and may require spontaneous store-and-forward among peer Smart Objects to ensure connectivity.Such characteristics pose challenges, on one hand in terms of software running on Smart Objects, and on the other hand in terms of network protocols Smart Objects use to communicate.In consequence, novel evaluation methods and experimental tools are needed to study Smart Object networks in vivo, new software platforms are needed to efficiently operate Smart Objects, and innovative networking paradigms and protocols are required to interconnect Smart Objects.This thesis addresses these challenges by introducing new tools for large scale testbed-driven experimental research, a novel operating system (RIOT) applicable to a wide variety of connected Smart Objects, and several new mechanisms leveraging information-centric networking which significantly improve energy-efficiency compared to state-of-the-art network protocols in the Internet of Things
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Gupta, Smrati. "Contributions on networking techniques for wireless relay channels." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/283583.
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En los últimos años, el relaying ha surgido como una poderosa técnica para mejorar la cobertura y el rendimiento de las redes inalámbricas. En consecuencia, la creciente demanda de servicios basados en redes inalámbricas con relays, ha conducido al desarrollo de técnicas de networking nuevas y eficientes. Estas técnicas pueden ser utilizadas en diferentes capas de la pila de protocolos y pueden ser optimizadas para cumplir diversos objetivos, como la maximización del rendimiento, mejora de cobertura, etc. en el marco de las redes existentes. En esta tesis se presenta una serie de contribuciones para las técnicas de networking, utilizando una variedad de herramientas a fin de maximizar el rendimiento de la red y satisfacer las demandas de los usuarios. Para hacer contribuciones efectivas y concretas, hemos seleccionado problemas exigentes en varios aspectos de las técnicas avanzadas de networking en redes inalámbricas y presentamos soluciones hábiles a éstos. En particular, hacemos uso de diferentes herramientas como network coding, técnicas de transmisión cognitiva y teoría de juegos, con el fin de diseñar soluciones para las redes inalámbricas modernas con relays. Las principales técnicas de networking, para diferentes capas de la pila de protocolos, presentadas en esta tesis son las siguientes.
En primer lugar, a nivel de capa física, maximizamos el rendimiento de la red mediante la herramienta de network coding en la capa física (PNC) basada en el método compute and forward (CF) en redes con relays. Se sabe que las tasas máximas alcanzables en la transmisión basada en CF están limitadas debido a las aproximaciones de los canales en el relay. Proponemos el Integer Forcing Precoder (IFP), para superar esta limitación. Con la ayuda del IFP, demostramos una posible implementación de la prometedora técnica de CF, que allanaría el camino para un diseño avanzado del precodificador para maximizar el rendimiento de la red.
En segundo lugar, en la capa de enlace de la red, maximizamos el rendimiento con el uso de dos herramientas diferentes: (a) network coding junto con una optimización cross-layer condicionada a la calidad de experiencia (QoE), (b) técnicas de transmisión cognitiva. En (a), utilizamos el network coding en la capa de enlace, en coherencia con la optimización cross-layer y demostramos la existencia de compromisos importantes entre rendimiento y QoE alcanzable. Por otra parte, proponemos utilizar factores realistas como la ubicación de los usuarios finales en la red de relays para optimizar el servicio obtenido en presencia de tales compromisos. En (b), utilizamos las técnicas de transmisión cognitiva para analizar la mejora en el rendimiento de una red inalámbrica particular, el sistema de satélites duales (DSS). Además, presentamos un análisis taxonómico exhaustivo de las diferentes técnicas cognitivas en DSS. Con la ayuda de este trabajo, proponemos posibles diseños para las técnicas "inteligentes" de networking, las cuales constituyen una plataforma para maximizar el rendimiento de futuras redes inalámbricas con relays.
En tercer lugar, en la capa de transporte-aplicación, maximizamos no sólo el rendimiento, si no también una utilidad conjunta compuesta de rendimiento, QoE y coste del servicio, utilizando herramientas de la teoría de juegos. Consideramos una aplicación de video transmitida por una red inalámbrica en la que las usuarios que compiten tratan de maximizar sus utilidades. Modelamos y predecimos los puntos de equilibrio alcanzados usando repetidas formulaciones del juego, teniendo en cuenta factores reales como la tolerancia de los usuarios y el criterio óptimo de Pareto. Con la ayuda de este trabajo, se demuestra el potencial del uso de técnicas repetidas de teoría de juegos en redes inalámbricas, prometiendo así mejorar el rendimiento del sistema existente de manera categórica. En general, esta tesis presenta propuestas prácticas y efectivas junto con un análisis holístico para diferentes aspectos en el desarrollo de técnicas modernas de networking para redes inalámbricas con relays.In the recent years, relaying has emerged as a powerful technique to improve the coverage and throughput of wireless networks. Consequently, the growing demands of the wireless relay networks based services has led to the development of novel and efficient networking techniques. These techniques can be used at different layers of the protocol stack and can be optimized to meet different objectives like throughput maximization, improving coverage etc. within existent networking framework. This thesis presents a series of contributions towards the networking techniques using a variety of tools in order to maximize the throughput of the network and satisfy the user demands. To make effective and concrete contributions, we have selected challenging problems in various aspects of advanced wireless networking techniques and presented neat solutions to these problems. In particular, we make use of the different tools like network coding, cognitive transmission techniques and game theory in order to design networking solutions for modern wireless relay networks. The main contributions of this thesis towards networking techniques at different layers of the protocol stack are as follows. Firstly, at the physical layer, we maximize the throughput of the network using the tool of physical layer network coding (PNC) based on compute and forward (CF) in relay networks. It is known that the maximum achievable rates in CF-based transmission are limited due to the channel approximations at the relay. We propose the integer forcing precoder (IFP), which bypasses this maximum rate achievability limitation. With the help of IFP, we demonstrate a possible implementation of the promising scheme of CF thereby paving the way for an advanced precoder design to maximize network throughput. Secondly, at the link-network layer, we maximize throughput with the use of two different tools: (a) network coding along with Quality of Experience (QoE) driven cross-layer optimization and (b) cognitive transmission techniques. For (a), we use network coding at link layer in coherence with cross-layer optimization and prove the existence of crucial trade-offs between throughput and achievable QoE. Moreover, it is proposed to use the realistic factors such as positioning of the end users in the relay network to optimize the service obtained in presence of such trade-offs. For (b), we use the cognitive transmission techniques to analyze the improvement in throughput of a particular wireless network, namely Dual Satellite systems (DSS). Moreover, an exhaustive taxonomic analysis of the different cognitive techniques in DSS is presented. With the help of this work, the possible designs for 'intelligent' networking techniques are proposed, which form a platform for maximizing the throughput performance of future wireless, relay networks. Thirdly, at the transport-application layer, we maximize not only the throughput but a joint utility comprised of throughput, QoE and cost of service, with the use of game theoretical tools. We consider a video application relayed over a wireless network and competing users trying to maximize their utilities. We model and predict the equilibriums achieved using repeated game formulations taking into account the realistic factors such as tolerance of the users and pareto optimality. With the help of this work, the potential of use of repeated game theoretical tools in wireless networks is proved which also promises to improve the existing system performance categorically. Overall, this thesis presents effective and practical propositions along with holistic analysis towards different aspects of development of modern networking techniques for wireless relay networks.
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Lee, Chung-Wei. "Altruistic QoS routing and multi-path multimedia communication." [Gainesville, Fla.] : University of Florida, 2001. http://etd.fcla.edu/etd/uf/2001/anp4085/dissertation6.pdf.
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Thesis (Ph. D.)--University of Florida, 2001.Title from first page of PDF file. Document formatted into pages; contains xi, 86 p.; also contains graphics. Vita. Includes bibliographical references (p. 82-85).
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Dai, Rui. "Correlation-based communication in wireless multimedia sensor networks." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42736.
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Wireless multimedia sensor networks (WMSNs) are networks of interconnected devices that allow retrieving video and audio streams, still images, and scalar data from the environment. In a densely deployed WMSN, there exists correlation among the observations of camera sensors with overlapped coverage areas, which introduces substantial data redundancy in the network. In this dissertation, efficient communication schemes are designed for WMSNs by leveraging the correlation of visual information observed by camera sensors. First, a spatial correlation model is developed to estimate the correlation of visual information and the joint entropy of multiple correlated camera sensors. The compression performance of correlated visual information is then studied. An entropy-based divergence measure is proposed to predict the compression efficiency of performing joint coding on the images from correlated cameras. Based on the predicted compression efficiency, a clustered coding technique is proposed that maximizes the overall compression gain of the visual information gathered in WMSNs. The correlation of visual information is then utilized to design a network scheduling scheme to maximize the lifetime of WMSNs. Furthermore, as many WMSN applications require QoS support, a correlation-aware QoS routing algorithm is introduced that can efficiently deliver visual information under QoS constraints. Evaluation results show that, by utilizing the correlation of visual information in the communication process, the energy efficiency and networking performance of WMSNs could be improved significantly.
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Green, Olander Jens. "Optimizing Communication Energy Efficiency for a Multimedia Application." Thesis, Linköpings universitet, Programvara och system, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-125789.
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Mobile devices have evolved rapidly in recent years and increased usage and performance are pushing contemporary battery technology to its limits. The constrained battery resources mean that the importance of energy-efficient application design is growing and in this regard wireless network accesses are a major contributor to a mobile device's overall energy consumption. Additionally, the energy consumption characteristics of modern cellular technologies make small volumes of poorly scheduled traffic account for a substantial share of a device's total energy consumption. However, quantifying the communication energy footprint is cumbersome, making it difficult for developers to profile applications from an energy consumption perspective and optimize traffic patterns. This thesis examines the traffic patterns of the Android client of the popular multimedia streaming service Spotify with the intention to reduce its energy footprint, in terms of 3G energy consumption. The application's automated test environment is extended to capture network traffic, which is used to estimate energy consumption. Automated system tests are designed and executed on a physical Android device connected to a 3G network, shedding light on the traffic patterns of different application features. All traffic between the Spotify client application and the backend servers is encrypted. To extract information about the traffic, the application code is instrumented to output supplementary information to the Android system log. The system log is then used as a source of information to attribute data traffic to different application modules and specific lines of code. Two simple traffic shaping techniques, traffic aggregation and piggybacking, are implemented in the application to provide more energy-efficient traffic patterns. As a result, 3G energy consumption during normal music playback is reduced by 22-54%, and a more contrived scenario achieves a 60% reduction. The reductions are attained by rescheduling a small class of messages, most notably data tracking application usage. These messages were found to account for a small fraction of total traffic volume, but a large portion of the application's overall 3G energy consumption.
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Shi, Zhaogong. "Connection admission control methods for multimedia communication systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq22016.pdf.
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Ganesh, Babu Thimma V. J. "Performance analysis of broadband multimedia wireless communication networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ63989.pdf.
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Itakura, Fumitada, Kazuya Takeda, Shigeki Matsubara, and Nobuo Kawaguchi. "Multimedia Data Collection of In-Car Speech Communication." ISCA(International Speech Communication Association), 2001. http://hdl.handle.net/2237/15451.
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Zarimpas, Vasileios. "Multimedia data transmission over multiple wireless communication channels." Thesis, Lancaster University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497216.
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Modern mobile applications demand a communications network that is universally accessible at any time and able to adapt to the application needs. Meeting these requirements can present a considerable challenge. In order to access information ubiquitously, hardware manufacturers started to integrate many network access technologies in single small, light and low-power portable device. The main objective of this thesis is to exploit the availability of multiple wired and wireless communication channels for multimedia data transmission and location based services.
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France, Emma F. "Modelling the multi in multi-party multimedia communication." Thesis, University of Glasgow, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321996.
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Handley, Mark James. "On internet multimedia conference control." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285140.
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Amornraksa, Thumrongrat. "Data security for multimedia communications." Thesis, University of Surrey, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298091.
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Yiu, Candy. "High Speed Wireless Networking for 60GHz." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/373.
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This thesis examines the problem of providing high data-rate wireless connectivity to users in indoor environments. The goal is to be able to reach Gbps/user rates even when there are multiple users present. The technology that we study is to use the 60 GHz spectrum whose special propagation properties make it ideally suited to this task. The approaches developed include using multiple spatially distributed smart antennas in a room or multiple co-located antennas to provide coverage where needed and when needed. All the antennas are connected to a single access point which allows us to dynamically change spectrum and link allocation among the users (as they move or as their needs change). The innovations in this work include the exploitation of the special properties of 60 GHz and the corresponding design of algorithms for efficient spectrum allocation. We use detailed simulations to demonstrate that very high data rates are indeed achievable.
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Matsukevich, Dzmitry. "Quantum networking with atomic ensembles." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07072006-173336/.
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Thesis (Ph. D.)--Physics, Georgia Institute of Technology, 2007.Kennedy, Brian, Committee Member ; Chapman, Michael, Committee Member ; Kuzmich, Alex, Committee Chair ; Raman, Chandra, Committee Member ; Voss, Paul, Committee Member.
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Lee, Kok Thong. "Performance analysis of Mobile Ad Hoc Networking routing protocols /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FLee%5Kok.pdf.
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Cloete, Ewoudt. "An exploration of the strategic implementation of marketing communication within social networking communication context." Thesis, North-West University, 2012. http://hdl.handle.net/10394/9004.
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Taking into consideration the dramatic changes ushered in by the exponential growth of social networking, marketers are left without a dependable framework on how to implement social networking strategically and in alignment with other modern as well as traditional marketing disciplines.
In light of this, the study aims to explore the strategic implementation of social networking within the context of a dependable marketing theoretical model, known as the marketing communications mix.
During the study’s literary exploration, social networking’s capacity as a viable professional marketing tool was discussed. Thereafter, the study’s main theoretical underpinning, marketing communications was discussed and analysed.
During the empirical phase of the research, a process of grounded theory was firstly followed in order to compile a list of typical social networking communications actions that are performed on social networking platforms. The list of typical social networking communication actions were then compared with the five disciplines of the marketing communications mix and consequently paired, based on their inherent similarities in regards to characteristics.
In an attempt to illustrate the practical use of the paring of social networking actions and the disciplines of the marketing communications mix, the empirical study conclusively followed a process of action research in order to analyse an organisation’s social networking strategy. It was established that the model could possibly increase the strategic alignment of an organisation’s social networking initiatives but that it should only be used as a guiding and adaptable framework as to not hamper the creative capacity of social networking marketing.
It was suggested that a follow-up study explore the ways in which social networking can complement and support other modern as well as traditional marketing initiatives as way to strengthen the case for an integrated approach to professional, strategic marketing.Thesis (MA (History of Art))--North-West University, Potchefstroom Campus, 2013.
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Pallis, Evangelos M. "Towards the provision of high quality interactive multimedia services via a wireless broadband networking infrastructure." Thesis, University of East London, 2002. http://roar.uel.ac.uk/3593/.
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This thesis contributes to the concept of wireless broadband access networking infrastructures by the design, implementation and evaluation of a novel network configuration that utilises a cellular architecture and provides symmetric interactivity over broadband downlink and uplink transmission channels. The design of the network configuration converges current wireless broadband access technologies, integrates all the appropriate hardware and software tools, and finally proposes a prototype wireless network, which is capable of providing access via the same platform to: i) high quality interactive multimedia services such as audio/video on demand (featuring bitrates higher than IMbps) over the TCP/IP stack, ii) fast Internet services (>lMbps), and iii) digital TV broadcasts (MPEG-2 format) based on the digital video broadcasting (DVB) standard. According to the proposed design, the network uses an innovative cellular architecture that utilises macro-cell configuration in the downlink and micro-cell configuration in the uplink. In this way, both digital TV broadcasts and the data for the interactive multimedia services (along with the Internet traffic) are multiplexed and transmitted to the user's neighbourhood (cell) wirelessly in the frequency band of 42GHz, by utilising the broadcasting delivery method and local multipoint distribution service (LMDS) technology. End-users of each cell may access the Internet or multimedia services via an intermediate communication node, the cell main node (CMN). The bi-directional communication between each user and the corresponding CMN is via 2.4GHz multichannel multipoint distribution service (MMDS) based links. These links provide for multiple user access under the IEEE 802.11 communication protocol, while enabling for user-to-user communication at rates of about 3Mbps (within a cell). For symmetric communication, each user returns to the service provider over the 42GHz frequency band via the intermediate CMN. The use of the 42GHz LMDS technology in both the uplink and downlink transmission paths enables symmetric interactivity, providing end-to-end data rates higher than IMbps. The network performance was evaluated using simulation tests (concerning the network throughput during multimedia services provision over the TCP/IP), the results of which indicated that the proposed architecture provides equal sharing of the system's resources during multiple users access. Based on the proposed design, this research involves the implementation of a prototype testbed that utilises a single-cell wireless network, incorporating a service provider about 5km away from the CMN, and a number of wireless users, geographically neighbouring the CMN. The implementation of the prototype system has been deployed in the frame of the E.U. funded project entitled CRABS (Cellular Radio Access for Broadband Services ACTS96/AC215). The service provider broadcasts a bouquet of live digital TV programmes (at a rate of 27.5Msymbols/s) multiplexed with interactive data information via the 42GHz link. All users within the cell receive the digital TV programmes over the 42GHz downlink. Users' requests for the provision of interactive services (i.e. fast Internet access, video/audio on demand) are carried from each user's premises to the CMN in the 2.4GHz band (IEEE 802.11 with frequency hopping) and subsequently to the service provider via a 42GHz uplink, at rates higher than IMbps. The implemented test-bed makes use of the TCP/IP stack, over which all interactive services are provided. In this respect, the research also involved performance evaluation tests on the test-bed regarding its network throughput. The work also examines the feasibility of the implemented test-bed to distribute non-live MPEG-2 encoded video streams (i.e. video on demand - VoD, audio on demand - AoD) over the TCP/IP stack and elaborates on the tradeoff between encoding rate, picture quality and network throughput. Towards this, a prototype objective picture quality evaluation method was developed, and experimental measurements verified this approach. The account of the research presented in this thesis is structured as follows: After a brief review and evaluation of relevant and currently available wireless access technologies, the thesis describes the design and the architecture of a prototype wireless broadband interactive access network capable of providing MPEG-2 multimedia services, distribute digital TV broadcasts and enable fast Internet access by converging MMDS and LMDS technologies. The research then evaluated the proposed design by conducting simulation tests, that concern the sharing of network resources during multimedia services' provision to single and multiple users, and a formula was derived, which provides an accurate estimation of the network throughput (in terms of available bit-rate) that an end-user accommodates, versus the number of concurrent end-users. Subsequently, the research discusses the implementation and evaluation of a prototype network, built according to the design specifications. In this respect, the work elaborated on the network performance during the provision of multimedia services (over the IP stack) for stationary and portable/mobile access by conducting a series of real condition tests (indoor and/or outdoor experiments) that were performed on the prototype network. Comparison of the real condition test-results with those of the simulation tests, confirmed the validity of the proposed design and network architecture and verified the capability of the prototype to distribute efficiently wireless broadband interactive audio-visual services and to share, equally, the network resources among all simultaneous users. The research then investigated the capability of the prototype network to deliver wirelessly (with the unicast method) MPEG-2 encoded video streams over the TCP/IP with satisfactory picture quality. An assessment was then made on the trade-off between picture quality and MPEG-2 video encoding rate, elaborating on the minimum rate that provides for acceptable picture quality. There is an examination of the trade-off between network resources and picture quality, and an evaluation of the minimum network throughput for satisfactory picture quality. Finally the research proposes an objective picture quality evaluation method and defines a threshold below which the picture quality (received by the end-user wirelessly over the TCP/IP stack in a VoD application) is acceptable. Based on this approach, real condition tests were undertaken that confirmed the capability of the proposed network to distribute wirelessly MPEG-2 video on demand streams over the TCP/IP with satisfactory picture quality. The thesis concludes by proposing further opportunities and directions for future exploitation and new configurations, including related topics for future research.
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McNair, Janise Yvette. "Handoff techniques for next generation wireless multimedia systems." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/15971.
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Tyson, Jason. "Connecting through Facebook the influence of social networking on communication /." Winston-Salem, NC : Wake Forest University, 2009. http://dspace.zsr.wfu.edu/jspui/handle/10339/42606.
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