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Dissertations / Theses on the topic 'Multimedia communications'
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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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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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Li, Li. "Synchronization studies in multimedia communications." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6531.
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Synchronization is considered as a key issue in distributed multimedia systems. Synchronization problems exist in both multimedia presentational and conversational applications. In a multimedia presentation, two basic synchronization issues are involved: Temporal Presentation Control (TPC) and Simultaneous Real-Time Data Delivery (SRTDD). TPC deals with the ordering of data objects in the presentation. SRTDD refers to simultaneously delivering multimedia data in different data streams belonging to the same time interval. In multimedia conversational applications, e.g., in cooperative applications, coordination control and causal ordering of the events give another synchronization problem. This thesis investigates the synchronization control in the distributed multimedia systems. All the above synchronization issues are covered. The temporal model and a synchronization algorithm for the TPC are proposed, which can support the real-time multimedia teleorchestration when multiple independent information sources are involved. The temporal model handles the relative and imprecise temporal requirements among the data objects in the "fuzzy" presentation scenario, and supports the synchronization dialogue among the independent sources. Thus the synchronization algorithm can be performed in a distributed manner. For the SRTDD control, an entire control architecture is presented which follows the layered communications model. We have introduced the multimedia session management, multimedia segment delivery, etc., to achieve the simultaneous data delivery. The Synchronization Quality of Service (SQoS) parameters are first applied for the SRTDD control over the ATM network. Meanwhile, taking the multimedia joint editing, one of the popular multimedia collaborative applications, as an example, we have developed the coordination control and the causal ordering algorithms for the joint editing session. Then in the second part of this thesis, we have studied the analytical performance modeling for distributed multimedia systems where the synchronization is considered. Stochastic Petri Nets (SPN) are applied to model the different multimedia synchronization systems. We developed a computational algorithm for a class of SPNs, i.e., the LBSPNs (Locally Balanced Stochastic Petri Nets), which have product form solutions. Applying the computational algorithm for LBSPN, the performance analysis of a joint editing system is conducted.
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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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Zhang, Guoqiang. "Robust Multimedia Communications over Packet Networks." Doctoral thesis, KTH, Ljud- och bildbehandling, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24223.
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Multimedia communications over packet networks, and in particular the voice over IP (VoIP) application, have become an integral part of society. However, the unreliable and heterogeneous nature of packet networks has led to a best-effort delivery of services. Delay, limitation of bandwidth, and packet-loss rate all affect the quality of service (QoS). In this thesis, we address two important network impairments in the design of robust multimedia communication systems: packet delay-variation and packet-loss. Paper A considers the mitigation of the effect of packet delay-variation for audio communications by introducing a buffer at the receiver side. A new adaptive playout scheduling approach is proposed to control the buffering length, or, equivalently, the packet playout deadlines, in response to varying network conditions. A Wiener process is used to model the fluctuation of the buffering length without any playout adjustment. The playout scheduling problem is then reformulated as a stochastic impulse control problem by taking the playout adjustment as the control signal. The proposed approach is shown to be the optimal solution to the new control problem. It is demonstrated experimentally that the proposed approach provides improved perceived conversional quality. Papers B, C and D address the packet-loss issue. Paper B focuses on the design of a low-complexity packet-loss concealment (PLC) method that is compatible with existing speech codecs for VoIP application. The new method is rigorously motivated based on the autoregressive (AR) speech model and the minimum mean squared error (MMSE) criterion. The effect of model estimation error on the prediction of the missing speech segment is also considered and an upper bound for the prediction error is derived. Both the theoretical and experimental results provide insight in the performance of the heuristically designed PLC methods. On the other hand, Paper C and D consider an active packet-loss-resilient coding scheme, namely multiple description coding (MDC). In general, MDC can be used for the transmission of any media data. Paper C derives a simple and accurate approximation of the rate-distortion lower bound of a particular multiple- description scenario and then demonstrates that the performance loss of some practical MD systems can be evaluated easily with the new approximation. Paper D studies the performance limit of a vector Gaussian multiple description scenario. An outer bound to the rate-distortion region is derived, and the outer bound is tight when the problem specializes to the scalar Gaussian case.<br>QC20100830
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Chng, Raymond S. K. "A parallel architecture for multimedia communications." Thesis, University of Essex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332803.
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Fabri, S. N. "Multimedia communications over mobile packet networks." Thesis, University of Surrey, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343461.
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This thesis describes several concepts associated with the transmission of multimedia services over mobile radio access networks. The error performance and traffic requirements of real-time video transmission over the General Packet Radio Services (GPRS) access network and its successor Enhanced-GPRS is examined. In view of this. video error resilience techniques which exploit channel prioritisation mechanisms are introduced with a view to increasing the robustness of received video sequences encoded with MPEG-4 to channel errors. These include stream prioritisation using unequal error protection and region-of-interest prioritisation for use in multiparty communications and streaming applications. A new forward-error correction scheme for EGPRS which uses iterative serially-concatenated convolutional-Reed Solomon codes is designed and is shown to significantly enhance the error performance for real-time services. A study of (he use of backward error correction mechanisms when transmitting streaming multimedia services is carried out, and a new retransmission scheme is introduced to increase the capacity of the radio access network when supporting streaming services
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Tsingotjidis, Periklis. "Performance evaluation of a multimedia communications system." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5920.
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Yeadon, Nicholas John. "Quality of service filtering for multimedia communications." Thesis, Lancaster University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337469.
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Adams, Anne Lorraine. "Users' perceptions of privacy in multimedia communications." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248208.
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Eminsoy, Sertaç. "Active services QoS support for multimedia communications." Thesis, University of Surrey, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419984.
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Segovia, Sherri Dawn. "Contributing to a literacy of the body in videogame interaction." Thesis, The University of Texas at Dallas, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3706679.
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<p> This study deems that to play a videogame is to gain a literacy of the body. The motor aspect of human interaction with videogames has largely escaped analysis in hand-held controller interactions, yet this is a mass cultural phenomenon in which human movement is technologized and uniquely, digitally expressive. Videogames are motor imperative in some form or another; it is a condition of interaction with this medium that symbolically transposes human movement into far-flung digital action. Contrary to the assumption that full-body interactions present richer embodied experiences in videogame technology, the data reveal that subtle motoric phenomena have aesthetically significant substructures that are imaginatively unbounded, like high literacy. The subtlety of player hand-motor effort is difficult to observe and therefore describe, yet encompasses a constellation of observable dual phenomena expressed in the ties between human and digital processes. In order to better understand this human engagement with technology, this study uses a phenomenological frame as a first person research method combined with principles of linguistics and Rudolf Laban's system of movement transcription and analysis. The intention of this project is to provide a methodology for describing and analyzing this remarkable, complex human interaction with technology in order to discuss its interdisciplinary implications for designers and theorists interested in the phenomena of videogames, as well as to anchor this interactive complexity in the humanities.</p>
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Valadon, Cyril. "Advanced CDMA receiver architectures for satellite multimedia communications." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843442/.
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Future mobile broadband communication systems aim to provide a wide range of multimedia services (telephony, video conferencing, audio and video broadcasting, etc.) to a large number of users. In order to achieve a global coverage and reach remote users, satellite is foreseen to be a key component in the development of such networks. When compared to first-generation mobile satellite communication systems, these future satellite networks will need to provide significantly higher data rates whilst achieving very low bit error probability values. In order to keep the mobile user terminal as well as on-board processing complexity as low as possible, it is important to reach the required quality of service with very low values of the signal-to-noise ratio. Hence, particular attention must be paid to the design of the air interface of these future satellite systems. The use of CDMA presents a number of advantages for mobile communication systems, and hence CDMA technology has recently received a lot of attention for both second generation and future terrestrial multimedia systems. However, less effort has been put into the design of CDMA solutions for satellite communications. Moreover, good air interface designs for terrestrial systems do not necessarily translate into efficient solutions for the satellite environment. Hence, different techniques aimed at improving the performance of CDMA satellite systems are proposed in this thesis. First, the performance of S-CDMA, which reduces the level of MAI by co-ordinating the transmission of the different users, is analysed in satellite fading channels. Comparisons with the more conventional A-CDMA are provided and the impact on the transmission quality of imperfect power control, synchronisation errors and pulse shaping is assessed. In order to meet the very tight requirements set for multimedia services, FEC coding is required. Hence, the performance of S-CDMA in fading channels is presented for different channel coding techniques. The performance of the different schemes is characterised with both power and spectral efficiency and comparisons are made. In order to reduce the performance degradation due to the MAI, it is also possible to use multiuser detection algorithms at the receiver. In this thesis, the performance of MUD algorithms using an ANN architecture is analysed in satellite fading channels. Different training strategies and algorithms are considered and the performance of the ANN receivers is compared to that of the conventional correlator as well as other MUD algorithms. Finally, a number of different multi-rate spreading techniques are proposed and their respective complexity is discussed and compared. The power fluctuations caused by these different multi-rate spreading techniques are analysed in order to evaluate their performance in the satellite non-linear channel.
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Mauthe, Andreas Ulrich. "End-to-end support for multimedia multipeer communications." Thesis, Lancaster University, 1998. http://eprints.lancs.ac.uk/11590/.
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Al-Mualla, Mohammed Ebrahim. "Video coding for mobile communications : a motion-based approach." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324331.
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Almalki, Abdullah Mohammed. "A survey of Saudis' behaviors toward twitter as a news gathering tool." Thesis, Arkansas State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10095767.
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<p> Given the increasing popularity and effect of online media, especially Twitter, as news sources, this study was designed to examine Saudis’ behaviors toward Twitter with regard to newspapers and information delivery and the role that Twitter plays in getting news updates. It investigated if Saudi Twitter users perceive Twitter as a credible source for news and rely on it to read the news more than legacy newspapers and their online counterparts. This research conducted an online survey and distributed it among Saudis who use Twitter to get news updates. The sample of this study had been drawn online by using the “SnowBall” sampling method through Survey Monkey and, the sample was collected during December 2015 and January 2016. A total of 3,003 Saudi Twitter users completed all questions in the survey. The results showed that Saudis consider Twitter as a newsgathering tool; therefore, they read news on Twitter more than reading legacy newspapers because it is easier and the fastest way of getting news, which indicated that the area of legacy newspapers in Saudi Arabia is at stake. Moreover, Saudis positively rated Twitter as a trustworthy and credible source for getting news updates. Thereby, they concurred that using Twitter has changed the path that people deal with legacy newspapers. Furthermore, non-legacy newspapers’ Twitter accounts received the lion's share of Saudis trust, especially Sabq newspaper, that was at the top as the newspaper account with the highest following. In regard to age groups, young Twitter users in Saudi Arabia trust non-legacy newspaper Twitter accounts more than older users, while old Twitter users were more likely to trust legacy newspaper Twitter accounts. The disbelief in the fairness of legacy newspapers could also be referred to the Saudis’ understanding that the government has a sweeping power to direct the media. </p>
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Bakarman, Maryah. "SAUDI FEMALES’ SOCIAL MEDIA USE AND ATTITUDES TOWARD COSMETIC SURGERIES." Cleveland State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=csu1560793387780191.
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Fazzolari, Benton. "Tracing a Technological God| A Psychoanalytic Study of Google and the Global Ramifications of its Media Proliferation." Thesis, Florida Atlantic University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10610474.
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<p> This dissertation makes the connection between the human drive, as described by psychoanalysis, to construct God and the construction of the technological entity, Google. Google constitutes the extension of the early Christian period God to the twenty-first century. From the examination of significant religious and theological texts by significant theologians (Augustine, Thomas, Luther, Calvin, etc.) that explain the nature of God, the analogous relationship of God to Google will open a psychoanalytic discourse that answers questions on the current state of human mediation with the world. Freud and, more significantly, Lacan’s work connects the human creation of God, <i> ex nihilio,</i> to Google’s godly qualities and behaviors (omniscience, omnipotence, omnipresence, and omnibenevolence). This illustrates the powerful motivation behind the creation of an allencompassing physical / earthly entity that includes the immaterial properties of God.</p><p> Essentially, Google operates as the extension or replacement of the long reigning God in Western culture. Furthermore, the advent of science and technology through rationalism (as outlined by Nietzsche) results in the death of the metaphysical God and the ascension of the technological God. Google offers an appropriate example for study. Moreover, the work of Jean Baudrillard and Marshall McLuhan will further comment on Google as the technological manifestation of God, particularly in its media formulations. Finally, this dissertation concludes with a review that highlights future research with an exploration that foresees the death of Google from the same rational method of inquiry by which the death of God occurred at the end of the nineteenth century.</p>
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Duong, Quang Trung. "On Cooperative Communications and Its Application to Mobile Multimedia." Licentiate thesis, Karlskrona : Blekinge Institute of Technology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00461.
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With the rapid growth of multimedia services, future generations of wireless communications require higher data rates and a more reliable transmission link while keeping satisfactory quality of service. In this respect, multipleinput multiple-output (MIMO) antenna systems have been considered as an efficient approach to address these demands by offering significant multiplexing and diversity gains over single-antenna systems without increasing requirements on radio resources such as bandwidth and power. Although MIMO systems can unfold their huge benefit in cellular base stations, they may face limitations when it comes to their deployment in mobile handsets. In particular, the typically small-size of mobile handsets makes it impractical to deploy multiple antennas. To overcome this drawback, the concept of cooperative communications has recently been proposed and gained large interest in the research community. The key idea is to form a virtual MIMO antenna array by utilizing a third terminal, a so-called relay node, which assists the direct communication. After receiving the source’s message, the relay processes and forwards it to the destination. With this approach, the benefits of MIMO systems can be attained in a distributed fashion. Furthermore, cooperative communications can efficiently combat the severity of fading and shadowing effects through the assistance of relay terminals. It has been shown that using the relay can extend the coverage of wireless networks. In this thesis, we focus on the performance evaluation of such cooperative communication systems and their application to mobile multimedia. The thesis is divided into five parts. In particular, the first part proposes a hybrid decode-amplify-forward (HDAF) relaying protocol which can significantly improve the performance of cooperative communication systems compared to the two conventional schemes of decode-and-forward (DF) and amplify-and-forward (AF). It is interesting to see that the performance gain of HDAF over DF and AF strictly depends on the relative value of channel conditions between the two hops. The second part extends HDAF to the case of multiple relays. It is important to note that the gains are saturated as the number of relays tends to be a large value. This observation motivates us to use a small number of relays to reduce network overhead as well as system complexity while the obtained gains are still as much as in the large-number case. In the third part, we analyze the performance of DF relaying networks with best relay selection over Nakagami-m fading channels. Besides the diversity gain, we show that the spatial multiplexing gain can be achieved by cooperative communications. We analyze the performance of cooperative multiplexing systems in terms of symbol error rate and ergodic capacity over composite fading channels. Finally, in the fifth part, we exploit the benefit of both diversity and multiplexing gain by proposing an unequal error transmission scheme for mobile multimedia services using cooperative communications.
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Ghinea, Gheorghita. "Quality of perception : an essential facet of multimedia communications." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312428.
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HASEEB, Abdul. "Quality of Experience and Adaptation Techniques for Multimedia Communications." Doctoral thesis, Università degli studi di Ferrara, 2012. http://hdl.handle.net/11392/2389418.
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The widespread use of multimedia services on the World Wide Web and the advances
in end-user portable devices have recently increased the user demands for better quality.
Moreover, providing these services seamlessly and ubiquitously on wireless networks and
with user mobility poses hard challenges. To meet these challenges and fulfill the end-user
requirements, suitable strategies need to be adopted at both application level and network
level. At the application level rate and quality have to be adapted to time-varying bandwidth
limitations, whereas on the network side a mechanism for efficient use of the network
resources has to be implemented, to provide a better end-user Quality of Experience (QoE)
through better Quality of Service (QoS). The work in this thesis addresses these issues by
first investigating multi-stream rate adaptation techniques for Scalable Video Coding (SVC)
applications aimed at a fair provision of QoE to end-users. Rate Distortion (R-D) models
for real-time and non real-time video streaming have been proposed and a rate adaptation
technique is also developed to minimize with fairness the distortion of multiple videos
with difference complexities. To provide resiliency against errors, the effect of Unequal
Error protection (UXP) based on Reed Solomon (RS) encoding with erasure correction has
been also included in the proposed R-D modelling. Moreover, to improve the support of
QoE at the network level for multimedia applications sensitive to delays, jitters and packet
drops, a technique to prioritise different traffic flows using specific QoS classes within an
intermediate DiffServ network integrated with a WiMAX access system is investigated.
Simulations were performed to test the network under different congestion scenarios.
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Alamri, Safi S. "Text-independent, automatic speaker recognition system evaluation with males speaking both Arabic and English." Thesis, University of Colorado at Denver, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1605087.
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<p>Automatic speaker recognition is an important key to speaker identification in media forensics and with the increase of cultures mixing, there?s an increase in bilingual speakers all around the world. The purpose of this thesis is to compare text-independent samples of one person using two different languages, Arabic and English, against a single language reference population. The hope is that a design can be started that may be useful in further developing software that can complete accurate text-independent ASR for bilingual speakers speaking either language against a single language reference population. This thesis took an Arabic model sample and compared it against samples that were both Arabic and English using and an Arabic reference population, all collected from videos downloaded from the Internet. All of the samples were text-independent and enhanced to optimal performance. The data was run through a biometric software called BATVOX 4.1, which utilizes the MFCCs and GMM methods of speaker recognition and identification. The result of testing through BATVOX 4.1 was likelihood ratios for each sample that were evaluated for similarities and differences, trends, and problems that had occurred.
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Reynolds, Ian Jeffrey. "Navigating the Modern Music IndustryFrom Production to Distribution." Ohio University Honors Tutorial College / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1399990762.
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Salewski, William Shawn. "Mobile technology and Canadian commercial radio: Friends or foes?" Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28140.
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A defining aspect of our era is the continuous migration of media consumers toward alternative distribution platforms. These are used to access content formerly available only in traditional media's original format. The intensification of wireless networks and the increasing portability of content, music content in particular, has resulted in radio listeners reverting to wireless delivery technologies to access, discover, listen to, share and store music. This empirical research project explores the consequences of mobile technology on commercial radio by looking at the ways in which mobility is altering the relationship between commercial radio and music fans.
The specific research objectives of this study are threefold: (1) to better understand the increasing role of the mobile industry and of wireless delivery technologies as purveyors of music; (2) to explore their repercussions on the viability of commercial radio; and (3) to identify the appearance of effects on the habits and expectations of radio listeners.
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Galipeau, Marcy. "New Media: Threat or Opportunity? Finding a Way to Balance New Media Initiatives within the Traditional Broadcasting World." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28726.
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This research aggregated key elements discussed during the CRTC Public Hearing on New Media, in order to examine fundamentals for the development of sustainable business models within the new media environment. The use of a qualitative methodology allowed the progressive gathering of in-depth information. Three main data collection techniques were used to obtain the desired information. First, an observational case study focused on the new media public proceeding. Second, a thorough content analysis examined public submissions through grids in order to extract relevant data. Third, formal interviews with regulatory experts were used to access information at a more intimate level. In the context of this study five media groups were chosen for examination. This would include, private broadcasters, public broadcasters, the culture and independent producers sector, telecommunications companies and Internet Service Providers. This gave an overall view of each sector within the Canadian broadcasting system. As a result of this research, the Canadian media industries will have to make urgent changes. To begin, platform-specific content production will be vital to the overall success of the system. This would allow proper distribution, minimizing the need of reformatting the content. Accordingly, maximizing the use of content will ensure that Canadians have access to programming that reflects their realities. Most companies agreed that new online advertising funding methods were needed, that new media initiatives generated economic growth and that content ownership should be a priority for upcoming regulatory decisions.
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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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Li, Yuen. "Media Influence and News Production Centralization| The Role of China News Service in Overseas Chinese Affairs." Thesis, The George Washington University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10278974.
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<p> After the bloody Tiananmen crackdown in 1989, the legitimacy of the Communist Party of China (CCP) suffered a devastating blow among the overseas Chinese (OC). The CCP responded to the challenge by implementing transnational outreach policy in the OC community, which includes substantial efforts to increase the Party’s influence in the overseas Chinese-language media (OCLM). By conducting a qualitative analysis of the evolution of the CCP's OC policy, this thesis finds that the Party has made tremendous progress in achieving the policy’s strategic goals: modernization and transnational legitimacy. The CCP’s increased influence in the OCLM has made crucial contributions to the Party's success in restoring transnational legitimacy in the OC community. This thesis finds that the China News Service (CNS), China's second-largest news agency operating under the Overseas Chinese Affairs Office of the State Council, plays a major role in the CCP's attempt to influence the OCLM and centralize the production of Chinese-language news.</p>
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Zheng, Hai. "QoS concerned efficient video communications over wireless networks." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/13869.
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Zhao, Xun. "Impact of multimedia in Sina Weibo." Thesis, Singapore Management University (Singapore), 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1548076.
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<p> Multimedia contents such as images and videos are widely used in social network sites nowadays. Sina Weibo, a Chinese microblogging service, is one of the first microblog platforms to incorporate multimedia content sharing features. This thesis provides statistical analysis on how multimedia contents are produced, consumed, and propagated in Sina Weibo. Based on 230 million tweets and 1.8 million user profiles in Sina Weibo, we study the impact of multimedia contents on the popularity of both users and tweets as well as tweet life span. In addition to consider the multimedia impact on popularity, we also compare the user influence in multimedia and text setting. Our preliminary study shows that multimedia tweets dominant pure text ones in Sina Weibo. Multimedia contents boost popularity of tweet as well as users. Users who tend to publish many multimedia tweets are also productive with text tweet. We prove that tweets with multimedia contents survive longer than text tweets. Finally, multimedia contents tend to attract more attention while text maintains discussion. Our results demonstrates the impact of multimedia in Sina Weibo with respect to how it affects the popularity, life span of tweets and the popularity of user. Our result is useful for web developers and microblogging marketers.</p>
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Vass, Jozsef. "Advanced wavelet image and video coding strategies for multimedia communications /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9974693.
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Liu, Qiang. "Available bandwidth estimation and rate-based congestion control in multimedia communication /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5844.
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Hill, Lyndon. "Motion estimation and segmentation for multimedia video objects." Thesis, University of Surrey, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365185.
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Kim, Kicheon. "QoS supporting mechanisms for a global packet switching network." Thesis, Lancaster University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387467.
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Chu, Xinlei. "Mongolian folklore expressed through music technology original multimedia soundtrack "On Horseback"." Thesis, Duquesne University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1554238.
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<p>I returned to my hometown and recorded Mongolian folk music—Mongolian Long Song and Mongolian Throat Singing. I wanted to combine technology and traditional folk music and write an electronic piece based on Mongolian vocal materials. I used what I’ve sampled, manipulated the sounds, composed the music, gathered the videos together and created this multimedia piece—On Horseback. The names of the four movements—Sand, Cloud, Water, and Fire—are four elements that I chose to represent the lifestyle in Inner Mongolia. </p><p> This thesis covers the journey of how I created this piece. I’ve explored many variations of technology such as sound sampling, mixing, and video editing. I’ve also gained the chance to bring traditional Mongolian folk vocal music out of my hometown and present it in my own work. </p>
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Fong, Yvonne. "Impact of television cooking shows on food preferences." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1603964.
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<p> The purpose of this study was to investigate the impact of two television cooking shows (healthy and unhealthy) among students at California State University, Long Beach. Specifically, the study evaluated the effects cooking shows have on food preferences for side dish, entrée and dessert options before and after viewing each show and by type of show viewed. </p><p> Participants were selected from students at California State University, Long Beach through convenience sampling. Willing participants completed two online surveys, each containing a different television cooking show episode along with an array of food images to select from. The cooking show episodes and the food images used in the survey were categorized as healthy or less healthy based on the nutrient profiling system, Model WXYfm. </p><p> Fifty-nine and 56 survey responses were included in the final analysis of the healthy and unhealthy cooking show, respectively. Food preferences were determined through the selection of food images in the surveys and analyzed using Chi-square tests. The results of this study show that television cooking shows promoting healthy and unhealthy foods have the potential to impact food preferences, particularly due to food exposure. Significant differences were found for five out of the nine hypotheses.</p>
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Burnsed, Robbie Renee. "Differences Between Faculty and Students' Perceptions of the Disruptiveness of Electronic Device Usage in the Classroom." Thesis, William Carey University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10191965.
Full textAbstract:
<p> The purpose of this research study was to explore the differences between faculty and students’ perceptions of electronic device usage in the classroom. A quantitative cross-sectional design was utilized with an independent samples two- tailed t-test to study the disruptiveness of electronic device usage in the classroom. Participants were asked to complete a survey concerning device usage in the classroom. The survey was sent to faculty and students of all disciplines and levels of education at two universities in a southeastern state in the United States. The literature review included electronic device usage, social media usage, benefits and challenges of electronic device usage in the classroom, and electronic device usage as helpful tool or a hindrance to the teaching and learning process. Findings from the study indicated that faculty perceived that electronic device usage was more disruptive in the classroom to the teaching and learning process than students. Recommendations included future research on technology usage in the classroom and ways to assist with decreasing the disruptions electronic devices cause in the teaching and learning process. Recommendations also included a specific approach of focusing on technology usage in the teaching and learning process based on generational groups.</p>
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Elaine, Wen Y. N. "Multimedia communication performance optimization on Pentium III processor." Thesis, The University of Sydney, 2000. https://hdl.handle.net/2123/28559.
Full textAbstract:
At present, there are many hardware and software implementations that provide
reasonable quality real-time multimedia communication such as video telephony and
conferencing. Since sofiware-based video telephony can provide lower cost and more
flexible implementations than hardware-based systems, many systems are
implemented in software. Due to the computationally intensive algorithms in video
telephony, there are some real-time computation bottlenecks that lead to difficulties in
improving performance to achieve better quality.
With the emerging of a new group of multimedia-related processor instructions, a
significant improvement to the real-time implementation of multimedia
communication systems can be made. One such a group of instructions is the
Streaming SIMD Extensions of the Pentium® III processor. This thesis describes
multimedia coding related optimizations using the Pentium® III Streaming SIMD
Extensions in a video telephony system based on the ITU—T (International
Telecommunication Union — Telecommunication Standardization Sector) H.324 and
H.323 standards. It focuses on the implementation of three computationally intensive
algorithms, the Sum of Absolute Difference (SAD) used in Video motion estimation,
the Discrete Cosine Transform (DCT) used in hybrid Video codecs (e.g. H.261 and
H.263), and the Dot Product (DP) in many audio codecs (e.g. G.723.1). Depending on
whether algorithms use SSIMDEs instructions, integer or floating point, the
performance improvement is not certain. The experimental results presented in this
thesis show that SAD and DP achieve improvements as expected, whereas DCT does
not benefit from using SSIMDEs. The thesis discusses performance improvements
and analyses the results.
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Manescu, Corneliu. "Video and voice coding for mobile ad-hoc collaboration." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000740.
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Gallegos, Christopher M. "The new "gayborhood"| Defining and redefining the gay community in a technological age." Thesis, University of Colorado at Denver, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10247825.
Full textAbstract:
<p> What is community? What defines it, and what creates it? What—or who—is the gay community? Is the gay community the same as it was ten, twenty, or even thirty years ago? Those are some of the questions I will be answering as I explore the creation, expansion, and subsequent integration of the physical gay community into one that embraces an online, fragmented community. I will explore the creation and evolution of the gay community, examining its early years and the challenges it faced as a marginalized group. To help define community, I will use the concept of identity theory by incorporating the theory of play and weaving the idea of claiming public space into my argument to show how the physical, economic, social creation of the gay community is dependent upon a geographic and virtual community. Those examples will set up my argument that the idea of community has changed in part to the commonality of technology and social applications. I argue that the idea of the traditional gay and lesbian community, which relied heavily on where you lived, has become fragmented and disjointed because of the reliance of an online, virtual community which, in turn, has led to a lack of interpersonal connections among individuals of this marginalized group.</p>
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Muñoz, Da Costa Ricardo Daniel. "The Effects of Text and Hybrid Graphic-Text Formats on Pilot Performance Using Flight Deck Data Communication Displays." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1369266508.
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Curtin, Patrick Rowland. "A realistic, survivable packet radio network design for mobile multimedia communications." Thesis, University of Ottawa (Canada), 1998. http://hdl.handle.net/10393/4543.
Full textAbstract:
The provision of multimedia services to a wireless environment presents several technical challenges. The extension of these services to a survivable, distributed system adds a significant level of complexity. Packet radio network technology offers one possible starting point for a solution. This thesis approaches the problem of delivering integrated voice, low grade video and low rate data services to a wireless network operating in a distributed environment through the use of a packet radio architecture. An overview of the technical specifications to be addressed in the network design is used to define the operational requirement. A radio channel model based on the Hata-Okumara approach is then developed in order to provide a realistic simulation framework for the system and a basis for network connectivity maps in subsequent chapters. The issues related to the operation of a distributed network are then explored, essentially illustrating the design implications of survivability. Several different multiple access techniques are also evaluated for suitability in this network design. Based upon the criteria provided at the onset, a slotted CDMA methodology is recommended. This leads to the establishment of network control parameters including the data structure, routing and scheduling schemes based on slotted CDMA operation in a distributed environment. Finally, issues related to network integration and enhancements are discussed, including CDMA code orientation, control channel modifications and acknowledgements. Recommendations for future work are also provided.
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Sadka, Abdul-Hamid. "Error control strategies in block-transform video coders for multimedia communications." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/843250/.
Full textAbstract:
The aim of this research is to enhance the quality of service in video applications when they are operating over error prone environments. With high compression ratio and low complexity block transform video coders, such as ITU-T H.263 standard algorithm for very low bit rate video coding, compressed video streams can be used for multimedia services. However, when transmitting compressed video streams over channels with degraded conditions, several problems arise and undermine the video decoder from correctly reconstructing the video signal. This thesis presents several techniques employed to enhance the quality of service of a video communication application under erroneous conditions. First, block transform methods for video coding are examined, and their strengths and weaknesses are assessed in terms of performance and error robustness. Packetised video signals are considered and two different techniques are implemented for packet video networks to improve the quality of service on one hand and help resolve the state of congestion that might occur on any video communication medium on the other hand. Additionally, zero redundancy error concealment techniques are considered and applied on the block based video decoder to improve the quality of the reconstructed video signal without any redundancy added on the video bitstream. Then, the aspects of error resilience issues in block transfom video coders are discussed. Based on the different categories of errors encountered in coded video streams, several novel techniques are implemented to render the video coder more immune to channel deterioration. Some of these techniques are combined to form an error resilience algorithm that is implemented on H.263 to enhance its performance over error prone environments such as mobile radio links. In parallel with the development process of the MPEG-4 video coder, we apply the two-way decoding with reversible codewords on the H.263 standard. Results are shown throughout the thesis to evidence the effectiveness of the proposed techniques and illustrate the improvement on the quality of service on both the objective and subjective scales. We conclude with thoughts for future expansion of error control strategies in block based video coding for mobile multimedia services over the foreseen universal mobile telecommunication systems (UMTS) network.
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Curtin, Patrick. "A realistic, survivable packet radio network design for mobile multimedia communications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0034/MQ38741.pdf.
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Samanta, Swadesh Kumar. "Factors affecting the growth of multimedia communications services in a network." Thesis, University of Essex, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510506.
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Liang, Lei. "Peformance evaluations of IP multiparty multimedia communications over GEO satellite networks." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/844577/.
Full textAbstract:
With the rapid development of the Internet, new theories and technologies are blooming and boosting the associated applications. One group of important applications is the multiparty multimedia communications. Satellites, which have played an important role in telephony communication and TV broadcasting services, could also play an important role to provide multiparty multimedia communications with their global coverage and on-board processing ability over IP networks. IP multiparty multimedia conferencing is one of these communication applications. With the support of satellites, one can provide an IP conferencing service globally to anywhere, even the place does not have the access to terrestrial networks. This thesis introduces the VoIP technologies that underpin IP conferencing services. It describes protocols, architectures, network entities, and network performance. In addition, this thesis presents how a multicast routing architecture was designed for an IP conferencing system with consideration to the new features introduced by an integrated GEO satellite network. An associated conferencing model will be presented as well to accompany this routing architecture. All of the technologies used in the design were implemented in a demonstrator. To test and evaluate the system, efforts have been put into the IP traffic measurement technologies and a measurement regime was developed to evaluate the system with consideration to multicast routing and the system architecture. New relative QoS requirements of multiparty communications are identified in this thesis. A set of parameters to present these new requirements are proposed as derivations of the IPPM (IP Performance Metrics) end-to-end parameters. A new adaptive QoS optimisation algorithm is proposed that is based on the measurement of these new parameters to satisfy the relative QoS requirements of the multiparty multimedia communications. Simulations were carried out to verify this algorithm and the results prove that it can optimize the relative QoS for multiparty multimedia communications.
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Hameed, Abdul. "Perceptual Video Quality Model and its Application in Wireless Multimedia Communications." Diss., North Dakota State University, 2015. http://hdl.handle.net/10365/24867.
Full textAbstract:
With the exponential growth of video traffic over wireless networked and embedded
devices such as mobile phones and sensors, mechanisms are needed to predict the perceptual
quality of video in real time and with low complexity, based on which networking protocols can
control video quality and optimize network resources to meet the quality of experience
requirements of users. This thesis is composed of three related pieces of work. In the first piece of
work, an efficient and light-weight video quality prediction model through partial parsing of
compressed from the H.264/AVC compressed bitstream is proposed. A set of features were
introduced to reflect video content characteristics and distortions caused by compression and
transmission and were obtained directly in parsing mode without decoding the pixel information
in macro-blocks. Based on the features, an artificial neural network model was trained for
perceptual quality prediction. In the second piece of work, a perceptual video quality prediction
model is trained based on massive subjective test results. Prediction of perceptual quality is
achieved through a decision tree using a set of easily calculated features from the compressed
bitstream and the network. Moreover, based on the prediction model, a novel Forward Error
Correction (FEC) scheme is introduced to protect video packets by taking into consideration video
content characteristics, compression parameters, as well as network condition. Given a perceptual
quality requirement, the error control scheme adjusts the level of protection for different
components in a video stream such that the network overhead needed for transmission is
minimized. In the third piece of work, a study was conducted to examine whether the previous
prediction model could provide a good confidence measure in a different domain of judgments.
The accuracy of judgements demonstrated the predictive validity of confidence measure with
respect packet loss ratio traits. The results of this study were consistent with the previous one and the experiments suggested that brief and evaluative thin slice judgments are made relatively
intuitively. Present research represents a new entry into the domain of high level judgments, such
as video confidence measure by the use of our existing perception quality model.
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Bakioglu, Burcu S. "The business of storytelling production of works, poaching communities, and creation of story worlds /." [Bloomington, Ind.] : Indiana University, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3373494.
Full textAbstract:
Thesis (Ph.D.)--Indiana University, Dept. of Comparative Literature, 2009.<br>Title from PDF t.p. (viewed on Jul 6, 2010). Source: Dissertation Abstracts International, Volume: 70-10, Section: A, page: 3842. Adviser: Joan Hawkins.
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Fough, Nazila. "Design and analysis of RTP circuit breaker for multimedia applications." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=228630.
Full textAbstract:
Live network multimedia applications (e.g., video conferencing, TV on demand) have been very popular in recent years and are expected to dominate Internet traffic in the near future. With multimedia and Internet-enabled devices being ubiquitous, mechanisms that ensure multimedia flows do not congest the Internet are crucial components of multimedia systems that are embraced rather than opposed by network service providers. The emergence of browser-based multimedia conferencing applications using the WebRTC protocol, an open source project aiming at Real-Time Communication (RTC) with Web, and wide deployment of these applications are expected to increase the traffic of interactive real-time multimedia on the Internet. RTP Media Congestion Avoidance Technique (RMCAT) may be applied to WebRTC, but this is a long-term process and WebRTC deployments will occur before RMCAT is completed. New methods and quick solutions are therefore required to protect the network from uncontrolled media flows until deployment of effective congestion control can be guaranteed. The RTP Protocol Circuit Breaker (RTP-CB) has been proposed in March 2012 within the Internet Engineering Task Force (IETF). Rather than providing congestion control, the RTP-CB is designed only to protect the network by terminating RTP/UDP flows that cause excessive congestion. While the deployment of congestion control for RTP/UDP flow remains an open issue, design a RTP-CB as a quick solution for protecting the current internet is the main focus of this work. In this work by analysing the UDP traffic over a limited path, a RTP-CB algorithm is designed. Then a packet sniffer's code (C routine) is written to sniff and analyse all RTP/UDP, TCP, RTCP SR, and RTCP RR traffic. Based on the designed algorithm the above code was developed further to work as a RTP-CB. This RTP-CB can be deployed on receiver or sender. After deployment of RTP-CB for RTP/UDP flows in a controlled network, its performance in a range of scenarios with using only its congestion rule has been evaluated. The evaluation showed some short coming in performance of RTP-CB in some certain condition when RTP-CB used only congestion rule. The performance of the RTP-CB is evaluated from two perspectives: First, the thesis considered network performance metrics, such as the frequency at which a RTP circuit breaker triggered. Then, it considered the experience of multimedia users, accounting for all outcomes to all users: those congesting the network (where the flow is terminated), those that did not (and are rewarded by reduced congestion) as well as flows that, without severely congesting the network, obtained little quality from a multimedia session and consumed network resources to no avail. Building on the knowledge gathered in these experiments, some extensions (Media Usability Rule) to the RTP-CB rules is proposed and evaluated. This work demonstrates this evaluation by streaming video flows over IP networks using a dedicated test-bed and proposed RTP-CB. These experiments assess the effect of network conditions (packet loss, jitter and network capacity constraint) on the transmission of different types of video stream with and without the proposed RTP-CB Media usability rule. The experiments prove that RTP-CB implementing the congestion rule alone can offer adequate protection to a network, but it does not perform well in some conditions, for example, when the bottleneck buffer size is small. Experiments confirm that the proposed (computationally inexpensive) modifications to the RTP-CB rules improve the RTP-CB performance. The results of these experiments and media usability rule were introduced in IETF RTP-CB draft version 07 of October 27, 2014 and later versions acknowledged contributions by the author of this thesis.
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Ni, Jian. "Content management and admission control in multimedia content delivery networks /." View abstract or full-text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20NI.
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Fang, Jian. "Advanced Transport Protocols for Space Communications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4959.
Full textAbstract:
Satellite IP networks are characterized by high bit error rates, long propagation delays, low bandwidth feedback links, and persistent fades
resulting from varying weather patterns. A new unicast transport protocol is designed to address all the above challenges. Two new algorithms, Jump
Start and Quick Recovery, are presented to replace the traditional Slow Start algorithm and to recover rapidly from multiple segment losses within one window of data. The characteristics of satellite IP networks also distinguish satellite multicasting from multicasting in terrestrial
wirelined networks. A reliable data multicast transport protocol, TCP-Peachtree, is proposed to solve the acknowledgment implosion and scalability problems in satellite IP networks. Developments in space technology are enabling the realization of deep space missions. The scientific data from these missions need to be delivered to the Earth
successfully. To achieve this goal, the InterPlaNetary Internet is proposed as the Internet of the deep space planetary networks, which is characterized by extremely high propagation delays, high link errors, asymmetrical bandwidth, and blackouts. A reliable transport protocol, TP-Planet, is proposed for data traffic in the InterPlaNetary Internet. TP-Planet deploys rate-based additive-increase multiplicative-decrease (AIMD) congestion control and replaces the inefficient slow start algorithm with a novel Initial State algorithm that allows the capture of link resources in a very fast and controlled manner. A new congestion detection and control mechanism is developed and a Blackout State is incorporated into the protocol operation. Multimedia traffic is also one part of the aggregate traffic over InterPlaNetary Internet backbone links and it has additional requirements such as minimum bandwidth, smooth traffic, and error control. To address all the above challenges, RCP-Planet is proposed. RCP-Planet consists of two novel algorithms, i.e., Begin State and Operational State. The protocol is based on a novel rate probing mechanism and a new rate control scheme to update the media rate smoothly based on the observed rate for the probing sequence.