Tesis sobre el tema "Multimedia Optimization"
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Aksoy, Cumhur Ercument. "Wireless thin client optimization for multimedia applications". [Florida] : State University System of Florida, 2000. http://etd.fcla.edu/etd/uf/2000/amt2363/Tez3.pdf.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xii, 154 p.; also contains graphics. Vita. Includes bibliographical references (p. 152-153).
Elaine, Wen Y. N. "Multimedia communication performance optimization on Pentium III processor". Thesis, The University of Sydney, 2000. https://hdl.handle.net/2123/28559.
Texto completoSezer, Osman Gokhan. "Data-driven transform optimization for next generation multimedia applications". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42765.
Texto completoYerima, Suleiman Y. "Quality of service optimization of multimedia traffic in mobile networks". Thesis, University of South Wales, 2009. https://pure.southwales.ac.uk/en/studentthesis/quality-of-service-optimization-of-multimedia-traffic-in-mobile-networks(975989e3-30f0-450b-9c6f-c2c51362f380).html.
Texto completoANEDDA, MATTEO. "QOS OPTIMIZATION FOR MULTIMEDIA DELIVERY CONTENT OVER HETEROGENEOUS WIRELESS NETWORKS". Doctoral thesis, Università degli Studi di Cagliari, 2017. http://hdl.handle.net/11584/249553.
Texto completoRahman, Tasnim. "Optimization of Cross-Layer Network Data based on Multimedia Application Requirements". Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-theses/1348.
Texto completoKim, Ilseo. "Per-exemplar analysis with MFoM fusion learning for multimedia retrieval and recounting". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52152.
Texto completoXu, Qing. "Flexible Radio Resource Management for Multicast Multimedia Service Provision : Modeling and Optimization". Thesis, Belfort-Montbéliard, 2014. http://www.theses.fr/2014BELF0237/document.
Texto completoThe high throughputs supported by the multimedia multicast services (MBMS) and the limited radio resources result in strong requirement for efficient radio resource management (RRM) in UMTS 3G networks. This PhD thesis proposes to solve the MBMS RRM problem as a combinatorial optimization problem. The work starts with a formal modeling of the problem, named as the Flexible Radio Resource Management Model (F2R2M). An in-depth analysis of the problem complexity and the search landscape is done from the model. It is showed that, by relaxing the OVSF code constraints, the MBMS RRM problem can be approximated as a Multiple-Choice Knapsack Problem (MCKP). Such work allows us to compute the theoretical solution bounds by solving the approximated MCKP. Then the fitness landscape analysis shows that the search spaces are rough and reveal several local optimums. Based on the analysis, some metaheuristic algorithms are studied to solve the MBMS RRM problem. We first show that a Greedy Local Search (GLS) and a Simulated Annealing (SA) allow us to find better solutions than the existing approaches implemented in the UMTS system, however the results are instable due to the landscape roughness. Finally we have developed a Tabu Search (TS) mixed with a Variable Neighborhood Search (VNS) algorithm and we have compared it with GLS, SA and UMTS embedded algorithms. Not only the TS outperforms all the other approaches on several scenarios but also, by comparing it with the theoretical solution bounds generated by the MCKP solver, we observe that TS is equal or close to the theoretical optimal solutions
Ribeiro, Leila Zurba. "Traffic Dimensioning for Multimedia Wireless Networks". Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/27199.
Texto completoPh. D.
Khernane, Nesrine. "Collaborative multimedia sensors for a connected and smart city". Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD027.
Texto completoDue to their high application potential in various innovative fields (telemonitoring, telemedicine, etc.), Wireless Multimedia Sensor Networks (WMSN) arouse the interest of numerous research projects. In addition to inherent constraints of scalar sensor networks in terms of energy limitation, deployment, coverage, reliability, ..., WMSNs impose new constraints related to the captured data. Indeed, multimedia data are very voluminous in comparison to scalar data and, in addition, have a time constraint (real-time delivery). Moreover, their semantic content, very rich, is subject to different perceptions and interpretations depending on the quality of the acquisition. As a target application, this dissertation focuses detecting available car parking spaces within a large city or a metropolis. Nevertheless, the proposed approaches can be used for a wide variety of WMSN applications for surveillance purposes.In this context, the main objective remains the network lifetime maximization while ensuring an acceptable perceived quality at the destination station. The studied approaches are of a distributed nature for scalability reasons, required in WMSN. Two main axes have been targeted: data processing at source nodes and data routing toward the destination.In the data processing axis, the main problem lies in the quality of the data to be transmitted. In general, the higher the quality is, the larger the data are, and consequently more important is the energy consumption and vice versa. It is therefore a question of finding a balance that preserve the energy resources; i.e. maximize the network lifetime while ensuring an acceptable quality of the sent data. The latter is the result of an encoding process at the source level.Thus, we proposed a fully distributed algorithm that maximizes the network lifetime by optimally balancing the encoding power and the source rate at the source node in order to meet a desired visual quality at the destination station. In opposition to existing approaches, our algorithm, of distributed nature, is ensured to find such a trade-off whatever the initial network configuration is.As a second step, we focuses on data routing. In fact, due to the complexity of this problem, especially in a decentralized context, literature works have not considered jointly data processing and routing. In other words, routing was considered as a network input.In the research work of this thesis, we have subsequently shown that the routing directly impacts the results of the network lifetime maximization process. Indeed, we have analyzed the behavior of several routing protocols in WMSN and the obtained results highlighted this influence. We have therefore proposed an analytic model integrating simultaneously the encoding of data at the source nodes and their routing to the base station. We have developed a semi-distributed resolution of this problem. The results obtained were very encouraging.Thus, in the second part, a fully distributed solution was proposed, in which, the routing axis cannot be achieved without the parameters, that should be determined and updated by the data processing axis. On the other hand, the data processing axis cannot be achieved without the routing tables updated by the routing axis. The proposed solution allows: a) an end-to-end routing with local decisions at each video sensor node and b) the choose of the sufficient number of paths needed to ensure a reliable data transmission.For the rest, we have completed our work by considering more realistic constraints, in particular the dynamic reliability of the links as well as the variation of their capacities (according to the remaining energy of the intermediate nodes). The simulation results showed savings of around 25% of the total energy
DeBardelaben, James Anthony. "An optimization-based approach for cost-effective embedded DSP system design". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15757.
Texto completoZaman, Faisal Ameen. "VN Embedding in SDN-based Metro Optical Network for Multimedia Services". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35933.
Texto completoRobisch, Katherine A. "Search Engine Optimization: A New Literacy Practice". University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1394533925.
Texto completoKropf, Carsten. "Efficient Reorganisation of Hybrid Index Structures Supporting Multimedia Search Criteria". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-216425.
Texto completoAbdullah, Miran Taha. "Smart Client-Server Protocol and Architecture for Adaptive Multimedia Streaming". Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/103324.
Texto completoIn recent years, multimedia services consumption has increased and it is expected that this trend will continue in the near future, becoming the evaluation of Quality of Experience (QoE) as a very important issue for assessing the quality of providers' services. In this sense, the optimization of the QoE is progressively receiving much attention considering that current solutions are not based on the adaptation, feasibility, cost-effectiveness, and reliability. The present dissertation is focused on the characterization, design, development and evaluation of different multimedia applications aimed to optimize the QoE. Therefore, this work investigates the influence that the networks infrastructure, the videos' characteristics and the users' terminals present on QoE of the current Internet multimedia services. The work is based on a comprehensive research of subjective and objective assessments in heterogeneous networks. Challenges and research questions related to the state of the art are discussed in this dissertation. In the first phase of this dissertation, we design a test methodology for assessing QoE of live video streaming and video on demand platforms to be transmitted over Wi-Fi and cellular networks. From this initial step, we will propound the related research issues and questions to solve this dissertation. Our methodology considers the use of subjective and objective metrics to evaluate the QoE perceived by end-users. A set of laboratory experiments is conducted where our proposed methodology is applied. The obtained results are gathered and analyzed to extract the relations between Quality of Service (QoS) and QoE. From the results, we propose a QoS-QoE mapping which allows predicting QoE. In the next phase of the research, we develop QoE-optimization algorithms based on network system management for Wi-Fi and cellular networks. The algorithms use the key parameters that were taken into account for QoE assessment. The goal of these algorithms is to provide a flexible management system for the networks in order to achieve the desirable trade-off between QoE maximization and resource usage efficiency. Lastly, the system testbed is designed in order to evaluate the performance of generic multimedia services applications for the different environments under test. The system testbed is based on virtualization approach; it uses the shared resources of a physical hardware to virtualize all components. The virtualized testbed provides virtualized network functions for the different scenarios such as the Internet (Content Delivery Networks - CDNs) and wireless networks. Therefore, lightweight protocols and agile mechanisms are adopted in the system to provide enhanced service to end-users. The QoE results are reported to the service providers according to the parameters defined in the evaluation process. As a result, we have obtained a cost-effective system, which is considered as a feasible way for test evaluation.
En els últims anys, el consum de serveis multimèdia ha augmentat i es preveu que aquesta tendència continue en un futur pròxim, convertitnt el tema de l'avaluació de la Qualitat d'Experiència (QoE) una tasca molt im-portant per a valorar el servei dels proveïdors. En aquest sentit, l'optimització de la QoE rep cada vegada més atenció degut a que les solucions actuals no tenen en compte, l'adaptació, la viabilitat, el rendiment i la fiabilitat. La present memòria se centra en la caracterització, disseny, desenvolupament i avaluació de diferents aplicacions multimèdia, amb la finalitat d'optimitzar la QoE. Per tant, aquest treball investiga la influència que la infraestructura de les xarxes, les característiques dels videos i els terminals dels usuaris tenen sobre la QoE dels serveis multimèdia actuals d'Iinternet. Aquesta tesi es basa en una recerca exhaustiva de l'avaluació subjectiva i objectiva de QoE en xarxes heterogènies. Els desafiaments i preguntes relacionats amb l'estat de la tècnica es discuteixen en aquesta dissertació. En la primera fase, dissenyem la metodologia de prova per a avaluar la QoE de transmissió de video en directe i de plataformes de video baix demanda en xarxes Wi-Fi i cel·lulars. A partir d'aquest primer pas, proposem els problemes de recerca relacionats i les preguntes a resoldre a través d'a-questa tesi. La nostra metodologia fa ús de mètriques subjectives i objecti-ves per a avaluar la QoE dels usuaris finals. Es realitzen un conjunt d'expe-riments en laboratori on s'aplica la nostra metodología. Els resultats obtin-guts es recopilen i analitzen per a extraure les relacions entre la QoS i la QoE. A partir d'aquests resultats, esproposa un mapatge de QoS-QoE que ens permetrà predir la QoE. En la següent fase de la recerca, desenvolupem els algoritmes d'optimi-tzació de la QoE per a l'administració de xarxes Wi-Fi i cel·lulars. Els algo-ritmes utilitzen els paràmetres clau que es van tenir en compte per a l'ava-luació de QoE. L'objectiu d'aquests algoritmes és proporcionar un sistema de gestió flexible per ales xarxes que permetrá aconseguir un equilibri con-trolat entre la maximització de la QoE i l'us eficient dels recursos. Finalment, el banc de proves del sistema està dissenyat per a avaluar el rendiment de les aplicacions de serveis multimèdia genèrics en els diferents entorns de prova. El banc de proves del sistema es basa en l'enfocament de virtualització; usa els recursos compartits d'un equip físic que virtualitza tots els components. El banc de proves virtualitzat proporciona les funcions de xarxa virtualitzades per a diferents escenaris, com Internet (les xarxes de distribució de continguts - CDNs) i xarxes sense fils. Per tant, s'adopten protocols lleugers i mecanismes àgils en el sistema per a proporcionar un millor servei als usuaris finals. Els resultats de QoE son proporcionats als proveïdors de serveis d'acord amb els paràmetres que es defineixen en el procés de l'avaluació. Com a resultat, hem obtés un sistema que presenta un servei rendible i com a viable per a l'avaluació de la prova.
Abdullah, MT. (2018). Smart Client-Server Protocol and Architecture for Adaptive Multimedia Streaming [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/103324
TESIS
FAVARIO, LEONARDO. "A New Modular E-Learning Platform Integrating an Enhanced Multimedia Experience". Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2709429.
Texto completoTian, Dihong. "Streaming Three-Dimensional Graphics with Optimized Transmission and Rendering Scalability". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14081.
Texto completoKompella, Sastry Venkata Subrahmanya. "Video Communications over Dynamic Ad Hoc Networks". Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28281.
Texto completoPh. D.
Le, Tien Anh. "Distributed cross-layer scalable multimedia services over next generation convergent networks : architectures and performances". Phd thesis, Institut National des Télécommunications, 2012. http://tel.archives-ouvertes.fr/tel-00939068.
Texto completoChoi, Jee W. "Reducing Communication Through Buffers on a SIMD Architecture". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4970.
Texto completoWong, Eric M. Eng Massachusetts Institute of Technology. "Optimizations in stream programming for multimedia applications". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/85522.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 85-89).
Multimedia applications are the most dominant workload in desktop and mobile computing. Such applications regularly process continuous sequences of data and can be naturally represented under the stream programming domain to take take advantage of domain-specific optimizations. Exploiting characteristics specific to multimedia programs can provide further significant impact on performance for this class of programs. This thesis identifies many multimedia applications that maintain induction variable state, which directly inhibits data parallelism for the program. We demonstrates it is essential to recognize and parallelize filters with induction variable state to enable scalable parallelization. We eliminate such state by introducing a new language construct that automatically returns the current iteration number of a target filter. This thesis also exploits the fact that multimedia applications are tolerant in the accuracy of the program output. We apply a memoization technique that exploits this tolerance and the repetitive nature of multimedia data. We provide a runtime system that automatically tunes the memoization capabilities for performance and output quality. These optimizations are implemented in the StreamIt programmming language. The necessity of parallelizing induction variable state and performance improvements and quality control of our memoization technique is demonstrated by a case study of the MPEG benchmark.
by Eric Wong.
M. Eng.
Argyriou, Antonios D. "Transport Layer Optimizations for Heterogeneous Wireless Multimedia Networks". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7466.
Texto completoHassan, Mohamed Said Abdou Ibrahim. "Adaptive Techniques and Optimizations for Media Streaming over Wireless Channels". Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1337%5F1%5Fm.pdf&type=application/pdf.
Texto completoBaaklini, Elias Michel. "Optimisation des applications multimédia sur des processeurs multicœurs embarqués". Thesis, Valenciennes, 2014. http://www.theses.fr/2014VALE0004/document.
Texto completoParallel computing is currently the dominating architecture in embedded systems. Concurrency improves the performance of the system rather without increasing the clock speed which affects the power consumption of the system. However, concurrency needs to be exploited in order to improve the system performance in different applications environments. Multimedia applications (real-Time conversational services such as video conferencing, video phone, etc.) have many new features that require complex computations compared to previous video coding standards. These applications have a challenging workload for future multiprocessors. Exploiting parallelism in multimedia applications can be done at data and functional levels or using different instruction sets and architectures. In this research, we design new parallel algorithms and mapping methodologies in order to exploit the natural existence of parallelism in multimedia applications, specifically the H.264/AVC video decoder. We mainly target symmetric shared-Memory multiprocessors (SMPs) for embedded devices such as ARM Cortex-A9 multicore chips. We evaluate our novel parallel algorithms of the H.264/AVC video decoder on different levels: memory load, energy consumption, and execution time
Daher, Alaa. "Optimisation des réseaux cellulaires pour les communications professionnelles critiques". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT009/document.
Texto completoBusiness- and mission-critical communications are communications between professional users either from the public safety sector or operating critical infrastructures. Owing to special coverage, priority access, reliability and resilience requirements, as well as additional services for professional users, these communications are conveyed by Professional Mobile Radio (PMR) networks. Driven by the demand growth, significant changes are taking place in the PMR industry. The existing PMR technologies are indeed not well suited to provide high data rates mobile services like video and photo transfers; hence, the adoption of commercial technologies for mission-critical communications is gaining strong momentum. On the other hand, the next generation cellular networks are envisioned to support a large variety of applications and services with heterogeneous performance requirements, i.e., enhanced Mobile BroadBand (eMBB), massive Machine-Type Communications (mMTC) and Ultra-Reliable Low Latency Communications (URLLC). Recently, mission-critical communications have been classified in a URLLC use case family, characterized by the need to a higher priority over other communications in the networks.In this context, we focus on enhancing the coverage of wireless networks providing group communications, the main service allowed by PMR networks, taking advantage of the current technologies (e.g. Multimedia Broadcast/Multicast Service), to meet the mission-critical communications needs. First, we evaluate the performance of unicast and multicast transmission techniques, i.e., the Multicast/Broadcast Single Frequency Network (MBSFN) and Single-Cell Point-To-Multipoint (SC-PTM), in terms of radio quality, system spectral efficiency and cell coverage, assuming static MBSFN configurations. Then, we introduce an analytical model to derive an approximate closed-form formula of the Signal to Interference plus Noise Ratio (SINR) in a MBSFN network.Furthermore, we propose a simple repetition scheme without request, as an alternative to Hybrid Automatic Repeat re-Quest (HARQ), in the aim of improving the network coverage in presence of group communications. By considering the wireless channel characteristics, as well as the service delay constraints, we show that our proposed scheme provides significant gains over traditional repetition schemes.Finally, we assess the trade-off in the cluster’s size of serving cells which arises between network coverage and capacity in multi-point transmissions. We formulate an optimization problem to maintain an acceptable system blocking probability, while maximizing the average SINR of the multicast group users. For group calls, a dynamic cluster of cells is selected based on the minimization of a submodular function that takes into account the traffic in every cell through some weights and the average SINR achieved by the group users. Traffic weights are then optimized using a Nelder-Mead simplex method with the objective of tracking a blocking probability threshold. Results show the importance of dynamic clustering in improving system capacity and coverage
ROSÁRIO, Denis Lima do. "Cross-layer optimizations for multimedia distribution over Wireless Multimedia Sensor Networks and Flying Ad-Hoc Networks with quality of experience support". Universidade Federal do Pará, 2014. http://repositorio.ufpa.br/jspui/handle/2011/5596.
Texto completoRejected by Edisangela Bastos (edisangela@ufpa.br), reason: on 2014-07-30T16:37:23Z (GMT)
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CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
University of Bern
A proliferação de conteúdo multimídia bem como a demanda por novos serviços de áudio ou vídeo promoveram o desenvolvimento de uma nova era baseada em informações multimídia, o que permitiu a evolução das Redes de Sensores Sem Fio Multimídia (RSSFM) e também das redes ad-hoc desenvolvimento formadas por VANTs (FANETs). Desta forma, serviços multimídia em tempo real requerem transmissões de vídeo em tempo real com uma baixa taxa de perda de quadros, atraso fim-a-fim tolerável, para apoiar a disseminação de vídeo com qualidade de Experiência (QoE) assegurada. Desta forma, um princípio fundamental de uma abordagem ciente de QoE é a transmissão de quadros de vídeo com alta prioridade, baixa taxa de perda de pacotes, bem como baixa sobrecarga da rede, a fim de protegê-los. Além disso, o conteúdo multimídia devem ser transmitidos a partir de um determinado nó de origem para um nó de destino através de nós intermediários com alta confiabilidade em um cenário de grande escala. O serviço de roteamento deve lidar com topologias dinâmicas causadas por falha de um nó ou a mobilidade do mesmo, bem como as mudanças no canal sem fio, a fim de continuar a operar mesmo em casos de mudanças de topologia durante a transmissão multimídia. Por fim, o mapeamento da satisfação do usuário ao assistir um determinado vídeo está se tornando um requisito fundamental para a entrega de conteúdos multimídia com suporte à QoE. Com estes objetivos em mente, soluções envolvendo transmissões multimídia deve levar em conta as características de vídeo e do usuário para melhorar a entrega de vídeo com qualidade assegurada. As principais contribuições desta tese são conduzidos pela seguinte questão de pesquisa: como para fornecer distribuição de multimídia com alta eficiência energética, confiabilidade, robustez, escalabilidade e suporte à QoE em redes sem fio ad hoc. A tese aborda vários domínios de problemas com contribuições em diferentes camadas da pilha de comunicação. Na camada de aplicação, apresentamos um mecanismo de redundância de pacotes ciente de QoE para reduzir o impacto da não confiabilidade do canal sem fio, e assim prover disseminação de conteúdo multimídia em tempo real com suporte à QoE. Na camada de rede, apresentamos dois protocolos de roteamento, ou seja, o video-aware Multi-hop and multi-path hierarchical routing protocol for Efficient VIdeo transmission for static WMSN scenarios (MEVI) e o cross-layer link quality and geographical-aware beaconless OR protocol for multimedia FANET scenarios (XLinGO). Ambos os protocolos de roteamento permitem a disseminação de conteúdo multimídia com eficiência energética, confiabilidade e suporte à QoE. Isto é alcançado através da combinação de métricas de múltiplas camadas para a tomada de decisão para o roteamento de pacotes, e assim estabelecer rotas confiáveis.
The proliferation of multimedia content and the demand for new audio or video services have fostered the development of a new era based on multimedia information, which allowed the evolution of Wireless Multimedia Sensor Networks (WMSNs) and also Flying Ad-Hoc Networks (FANETs). In this way, live multimedia services require realtime video transmissions with a low frame loss rate, tolerable end-to-end delay, and jitter to support video dissemination with Quality of Experience (QoE) support. Hence, a key principle in a QoE-aware approach is the transmission of high priority frames (protect them) with a minimum packet loss ratio, as well as network overhead. Moreover, multimedia content must be transmitted from a given source to the destination via intermediate nodes with high reliability in a large scale scenario. The routing service must cope with dynamic topologies caused by node failure or mobility, as well as wireless channel changes, in order to continue to operate despite dynamic topologies during multimedia transmission. Finally, understanding user satisfaction on watching a video sequence is becoming a key requirement for delivery of multimedia content with QoE support. With this goal in mind, solutions involving multimedia transmissions must take into account the video characteristics to improve video quality delivery. The main research contributions of this thesis are driven by the research question how to provide multimedia distribution with high energy-efficiency, reliability, robustness, scalability, and QoE support over wireless ad hoc networks. The thesis addresses several problem domains with contributions on different layers of the communication stack. At the application layer, we introduce a QoE-aware packet redundancy mechanism to reduce the impact of the unreliable and lossy nature of wireless environment to disseminate live multimedia content. At the network layer, we introduce two routing protocols, namely video-aware Multi-hop and multi-path hierarchical routing protocol for Efficient VIdeo transmission for static WMSN scenarios (MEVI), and cross-layer link quality and geographical-aware beaconless OR protocol for multimedia FANET scenarios (XLinGO). Both protocols enable multimedia dissemination with energy-efficiency, reliability and QoE support. This is achieved by combining multiple cross-layer metrics for routing decision in order to establish reliable routes.
Bouatit, Mohamed Nacer. "Optimisation du routage, tolérance aux pannes et gestion de l'énergie et de l'interférence pour la transmission des flux multimédia temps réel dans les réseaux de capteur sans fil". Thesis, Paris, CNAM, 2018. http://www.theses.fr/2018CNAM1188/document.
Texto completoMultimedia applications in WSNs convey large data (image, audio and video) that requires high transmission rate and intensive treatment and therefore high energy consumption. Effectively transmit these heterogeneous flows, while ensuring their reliability and guaranteeing QoS requirements, with the limited resources available, especially in critical contexts, remains an open scientific problem. That is why, in this thesis, we are interested in aspects related to : routing, fault tolerance and interference management in WMSNs.Given the very low number of routing protocols, that have approached the experimental phase and still less those who approached it during data transmission in real time, we developed in this context, a geographic routing protocol baptised GNMF (Geographic Non-interfering Multipath Fault-tolerant),First, we improved node's selection mode used by the greedy-forwarding, to deal with local minimum problem, where a multi-criteria objective function (distance, energy and reception power) related to next-hop choice has been defined. Then, we introduced an optimization phase of built paths to eliminate loops and an adaptive approach to manage simultaneous traffic transmissions.After that, we oriented towards fault tolerance, to ensure transmitted data reliability and network connectivity. To this end, we modeled the number of lost packets during package delivery and proposed two mechanisms. The curative is used when sudden failures occurs and the preventive to anticipate batteries depletion. Both are combined with a dynamic failover strategy during alternative paths construction.Finally, we presented an interference model and a third mechanism that limits interactions between adjacent links. In addition, we also defined a path loss model in a multipairs environment (source, sink) and computed the error probability coefficient based on a distance function that separates the data flows. A new metric has been added in the objective function, related to noise sum of the active nodes that interferes on forwarding set nodes of the current node.Obtained results show the effectiveness of the proposed approaches that have been studied and validated both by simulation and on an experimental testbed
Chen, Chi-Yuan y 陳麒元. "Optimization Research of Cognitive IP Multimedia Subsystem". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/31611414765453734381.
Texto completo國立東華大學
電機工程學系
102
Cognitive Radio (CR) is an innovative wireless sensing technology which can improve efficiency of spectrum usage. Based on CR, Cognitive network (CN) further focus on end-to-end communications for the global optimization and policy enforcement. However, there is a lack of global control channel or middleware for cognitive optimization in CN environment. In this thesis, we proposed a Cognitive IP Multimedia Subsystem framework called CogIMS, which consists of benefits from CN and IP multimedia subsystem (IMS). In this framework, the cognitive optimization is modeled as a service over IMS architecture. By adopting the proposed service-oriented framework, the global optimization is simple to achieve under standardized architecture and the computation requirement is reduced from users to core networks. In recent years, multimedia network services have moved from a single service to rich services which integrate multiservice capabilities. If all service requests require the user to send the request by himself, this will result to a huge control function load and complex service collaboration. In order to address service interaction and reuse the service capability, 3GPP proposes a Service Capability Interaction Manager (SCIM), which can provide service capabilities invocation and service interaction management between Application Servers (ASs) and Serving-Call Session Control Function (S-CSCF). However, its architecture may cause joint and cooperation problems between the different service providers. In this thesis, we propose a scalable service capability interaction framework called ServiceChord that can process multiple service capabilities with different ASs and reduce the call set-up delay while communicating with the S-CSCF. The Chord DHT technique is used to improve the framework, leading to a reduction of message redundancy on the S-CSCF while achieving an efficient service capability interaction, and providing scalability for CogIMS services and CogASs.
"Multi-path multimedia streaming system: adaptation and optimization". 2003. http://library.cuhk.edu.hk/record=b5891638.
Texto completoThesis (M.Phil.)--Chinese University of Hong Kong, 2003.
Includes bibliographical references (leaves 100-102).
Abstracts in English and Chinese.
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Multimedia Streaming Background --- p.2
Chapter 1.2 --- Streaming over the Internet --- p.2
Chapter 1.3 --- Traditional Approaches --- p.4
Chapter 1.4 --- Document Road-map --- p.6
Chapter 2 --- Related Work --- p.8
Chapter 3 --- Our Multi-path Streaming Approach --- p.11
Chapter 3.1 --- Potential Benefits --- p.14
Chapter 3.2 --- Performance Metrics --- p.15
Chapter 3.3 --- Visual Quality of Data --- p.15
Chapter 3.3.1 --- Experiment: Effect of Correlated Bursty Losses on Video Quality --- p.16
Chapter 4 --- Performance Evaluation using Gilbert Model --- p.18
Chapter 4.1 --- Mathematical analysis --- p.18
Chapter 4.1.1 --- Model --- p.19
Chapter 4.1.2 --- Performance Analysis of SP vs. Multi-path Streaming (without FEC) --- p.20
Chapter 4.1.3 --- Performance Analysis of SP vs. Multi-path Streaming (with FEC) --- p.26
Chapter 4.2 --- Analytical Model Based Evaluation --- p.32
Chapter 5 --- Functional Gilbert Model and Optimization --- p.45
Chapter 5.1 --- Functional Gilbert Model --- p.45
Chapter 5.2 --- Optimal Traffic Splitting --- p.48
Chapter 5.2.1 --- Optimization Based on Achieved Loss Rate --- p.49
Chapter 5.2.2 --- Optimization Based on Lag-1 Autocorrelation --- p.54
Chapter 5.3 --- Experiments --- p.58
Chapter 5.3.1 --- Type A Experiment: Without an Erasure Code --- p.59
Chapter 5.3.2 --- Type B Experiment: with an Erasure Code --- p.62
Chapter 6 --- NS Simulations --- p.68
Chapter 6.1 --- Simulation Setup --- p.68
Chapter 6.2 --- Simulation Result --- p.70
Chapter 7 --- Quantization of Traffic Splitting Vector --- p.80
Chapter 8 --- Prototype Implementation and Experiments --- p.86
Chapter 8.1 --- Multi-path Streaming Prototype --- p.86
Chapter 8.2 --- Experiments --- p.87
Chapter 9 --- Other Design Issues and Considerations --- p.93
Chapter 9.1 --- Requirements and Overheads --- p.93
Chapter 9.2 --- Share Point of Congestion (SPOC) --- p.96
Chapter 10 --- Conclusion --- p.98
Bibliography --- p.100
Oliveira, Tiago Alexandre Soares. "Multimedia content distribution optimization using software-defined networking". Master's thesis, 2018. http://hdl.handle.net/10773/25983.
Texto completoA generalização do acesso à Internet e equipamentos pessoais como smartphones, tablets e computadores pessoais, está a criar uma nova onda de consumo de conteúdos multimedia. Nas ultimas duas décadas, a indústria de transmissão de Televisão atravessou várias evoluções e alterações, evoluindo da distribuição analógica para a digital, de canais de Televisão de definição padrão para alta definição, do método de distribuição IPTV, até ao último conjunto de tecnologias na distribuição de conteúdos, OTT. A tecnologia IPTV introduziu novas funcionalidades que mudaram o papel passivo do cliente para um papel activo, revolucionando a forma como os utilizadores consumem conteúdos televisivos. Assim, os hábitos dos clientes começaram a moldar os serviços oferecidos, levando à oferta de consumo de conteúdos em qualquer lugar e em qualquer altura. A entrega de vídeo OTT é um reflexo destes hábitos, indo ao encontro dos desejos dos utilizadores, que introduz inúmeras vantagens sobre outras tecnologias discutidas neste trabalho. No entanto, a entrega de conteúdos OTT cria diversos problemas de escalabilidade e ameaça o modelo de negócio das Operadoras de Telecomunicações, porque os fornecedores de serviço OTT usam a infraestrutura das mesmas sem quaisquer custos. Consequentemente, os Operadores de Telecomunicações devem preparar a sua infraestrutura para o consumo futuro ao mesmo tempo que oferecem novos serviços para se manterem competitivos. Esta dissertação visa contribuir com conhecimento sobre quais alterações uma Operadora de Telecomunicações deve executar com o modelo de previsão de largura de banda proposto. Os resultados obtidos abriram caminho para o método de entrega de conteúdos multimedia proposto, que visa ao melhoramento da qualidade de experiência do utilizador ao mesmo tempo que se optimiza o processo de balanceamento de carga. No geral os testes confirmam uma melhoria na qualidade de experiência do utilizador usando o método proposto.
Mestrado em Engenharia de Computadores e Telemática
CAO, YU. "OPTIMIZATION OF RATELESS CODED SYSTEMS FOR WIRELESS MULTIMEDIA MULTICAST". Thesis, 2011. http://hdl.handle.net/1974/6551.
Texto completoThesis (Ph.D, Electrical & Computer Engineering) -- Queen's University, 2011-06-12 16:26:36.136
Lai, Kuan-Chung y 賴冠仲. "THE MULTIMEDIA APPLICATION PROGRAM OPTIMIZATION FOR MULTI-CORE SYSTEM". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/02568104770517569717.
Texto completo大同大學
資訊工程學系(所)
97
Multi-processor system-on-a-chip (MPSoC) architectures have received a lot of attention in the past years. As the gradually growing computation amount of data, using single core based systems is not feasible any more to meet the demands of embedded applications. In order to solving this problem, it’s a better choice to use multiple processor. By adopting multiple processor architectures, several works can be executed parallel and fast. A couple of key optimization techniques exist and have been demonstrated on SoC architecture. This paper presents these techniques and their effect on a multi-core environment and brings forward improvements. These techniques allow for optimization of memory space, reduction of processing time simultaneously. We choose a multimedia application as the optimization target. After the optimization of multimedia application architecture, we further improve the execution performance by assigning its works to dual-core and quad-core processor with using OpenMP techniques. It leads the execution performance to 73% and 201% improvement than single-core enviroonment.
Garofalakis, Minos N. "Query scheduling and optimization in parallel and multimedia databases". 1998. http://catalog.hathitrust.org/api/volumes/oclc/42243378.html.
Texto completoTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 148-161).
Chen, Chu-Chuan y 陳主瑔. "Using Particle Swarm Optimization Algorithm in Multimedia CDN Content Placement". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/59567539905206749116.
Texto completo銘傳大學
電腦與通訊工程學系碩士班
100
Multimedia Content Delivery Networks (CDN) is used to improve the performance and reliability on Internet. In CDN architecture, the multimedia contents are replicated from the origin server to replica servers in order to improve the performance and minimize the use of network bandwidth. Efficient placing the multimedia contents in CDN is a challenging problem. There are five factors that can be used to determine the placement of multimedia contents, they are bandwidth availability, connection availability, storage availability, CPU availability, and memory availability. In this thesis, a Particle Swarm Optimization (PSO) algorithm is adopted to solve this issue. PSO algorithm uses these five different input parameters as different dimensions. In this five dimension space, PSO algorithm can find out the global optimal solution. With this global optimal solution, it is the most appropriate replica server that should place the multimedia content. The simulation results show that the PSO algorithm can achieve a better performance than other algorithms.
Hsu, Shih-Wen y 許士文. "Service Oriented Cognitive IP Multimedia Subsystem: Using Multi-Objective Optimization". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/35924666147921061691.
Texto completo國立東華大學
電機工程學系
99
In recent years, the wireless terminal equipments growth rapidly resulted in wireless resource shortage. How to satisfy different service requirements and service quality under limited wireless resource for users to reach wireless resource allocation optimization becomes an important issue. Cognitive Radio is (CR) an innovative wireless sensing technology can improve efficiency of spectrum usage. Based on CR, Cognitive network (CN) is further focus on end-to-end communications for the global optimization and strategic decision. However, there is a lack of global control channel or middleware for cognitive optimization in CN environment. In next generation network (NGN), IP multimedia subsystem (IMS) provides a common framework with various services for users in heterogeneous network environments. Users can access to the IMS to acquire for services through various access technologies. In this thesis, we proposed Service Oriented Cognitive IP Multimedia Subsystem architecture called CogIMS, which consists of benefits from CN and IMS. CogIMS can satisfy user’s demand and optimize network efficiency by adopting the proposed service-oriented framework for conducting end-to-end communication and services. In order to realize service-oriented optimization, we use multi-objective optimization to reduce the complexity for implementing cognitive networks. The simulation results show that the proposed CogIMS can achieve the optimization of wireless resource allocation with different network situations.
"Batch Mode Active Learning for Multimedia Pattern Recognition". Doctoral diss., 2013. http://hdl.handle.net/2286/R.I.17891.
Texto completoDissertation/Thesis
Ph.D. Computer Science 2013
HSI, Tao-Hung y 奚道弘. "Admission Control Algorithms Based on Reward Optimization for Real-Time Multimedia servers". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/81309942170545371286.
Texto completo國立成功大學
資訊工程學系研究所
84
We develop and analyze a class of admission control algorithmsbased on the co ncept of ``reward optimization''for multimedia servers designed to provide on- demand servicesto clients in an environment where workload characteristics of clientscan change dynamically.These admission control algorithms are developed based on twostrategic choices, namely, ``deterministic'' or ``best-effort'' r egardingquality of service (QoS) control, and ``priority-reservation'' or ``no priority-reservation'' regarding reservation control. We first formulate the design of admission control algorithms forreal-time multimedia servers as a r eward optimization problem, with``reward'' referring to the ``value'' which th e system receives afterservicing prioritized clients based on the QoS levels r equested and delivered. Then, we derive close-form solutions for the reward ra te whichthe system can obtain under these admission control algorithms andvali date the analytical results with a simulated variable bit rate(VBR) video serv er. A physical interpretation is given forthe best combination of strategic ch oices under whichthe system can obtain the best reward as a function ofworkloa d characteristics of the clients.We discover that the reward rate which the sy stem can obtain under ourproposed admission control algorithms is much higher than that undertraditional admission control algorithms which do not consider reward optimization. For the simulation results, we also compare other perform ance metrics,including the number of clients which the system can admit, the u tilization of the server, and the effective QoS delivered to the clients.
Lin, Yi-Hsun y 林怡洵. "Quality-of-Service Optimization for Multiple Multimedia Tasks in Real-Time Embedded Systems". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/76261383475175215080.
Texto completo國立中正大學
資訊工程所
96
Nowadays, most embedded systems support different kinds of multimedia applic ations and real-time tasks. The computational requirements of multimedia applications are usually very expensive and embedded systems may not be powerful enough to support multiple multimedia applications. As a result, real-time tasks will miss their deadlines and thus get rejected. To solve this problem, we propose a Dynamic WorkloadShaping(DWS) methodby extending aDynamicBufferingTechnique to multiple multimedia tasks andintegrating two optimization methods. The scheduling method dynamically changes the playout buffer fill level of multimedia applications to periodically free up sufficient processor bandwidth to support other concurrently running real-time applications. The original scheduling method can only guarantee that theplayout devices can always read outdataitemsfrom theplayout buffers, but cannot guarantee any QoS. Two algorithms are proposed in this work to optimize and guarantee the quality of multimedia applications. The first algorithm optimizes the multimedia playout device rates, in terms of frames per second, while allowing a real-time task to meet its deadline. The second algorithm optimizes the processor bandwidth allocations,interms of MHz, given to each of the multimedia tasks, while allowing a real-time task to meet its deadline. We use several examples to illustrate how both algorithms can be applied to real systems.
Lin, Feng-Cheng. "Media Object Sequence Optimization for Reducing Presentation Lags in Automatically-Assembled Multimedia Presentations". 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0020-0301200800054100.
Texto completoLin, Feng-Cheng y 林峰正. "Media Object Sequence Optimization for Reducing Presentation Lags in Automatically-Assembled Multimedia Presentations". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/33955313233027119092.
Texto completo國立暨南國際大學
資訊工程學系
96
In a Digital Library/Museum system, media presentation is an important task that directly affects a contact with the user. How to transmit several media items effectively and accurately to reduce the user's waiting time (wait latency) is one of the main concern at this stage. Similar to a television broadcast, automatically and continuously present the media items in sequence enables the user to avoid downloading, and playing back repeatedly. This automatic presentation of the media is referred to as TV-like presentation and is user-preferred. According to this presentation, for reducing the wait latency, the server should be capable of deciding a proper order of the media items and effectively delivering. This dissertation focuses on optimizing the media transmission and playback technology by using the Prefetch mechanism under complicated environments. Aiming to seek the shortest time to arrange the sequence of the media items, this research applies the conventional scheduling algorithm to the multimedia file transmission and playback problem. First, an extensive discussion of the relevant issues related to reducing the presentation latency under various different types of constraints. Problems with object precedence constraints, objective due dates, and client-side buffer limitations are considered and solved with branch and bound solutions. In particular, the player-side buffer is “processing time dependence” and is different from the conventional item-based intermediate buffer constraints discussed in previous flow-shop scheduling problems; this new problem is then proven to be strongly NP-hard. In addition, various heuristic algorithms are proposed to approximate the optimal solution for the problem with the buffer constraint. From theoretical and practical 3G transmission experiments, a better scheduling algorithm can significantly reduce the wait latency efficiently.
Chu, Jui-Chin y 朱瑞欽. "Hardware/Software Optimization on Programmable/Configurable Multimedia Processor for Multi-Standard Video Codec". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/43593166262421012402.
Texto completo國立中正大學
資訊工程所
98
With the advances in the video coding algorithms, there is more and more demanded computational cost for the multimedia applications. The high complexity of multimedia applications enables processor architectures using parallelism with multithreading technique for performance improvement. In this dissertation, we propose a hardware/software optimization methodology on the UniCore visoMT processor, which is a multi-threading and multi-core processor with a main thread and several accelerative threads executed at the same time to realize multimedia codec. In the hardware optimization, we design fine-grained generic media functional units (GMFUs) as the physical accelerative threads. Since the multimedia applications typically process narrow data types (for example, 8-bit per pixel), GMFU is designed as SIMD architecture for providing the data-level parallelism. In addition, the scalability of GMFU makes the thread-level parallelism be feasible. We also provide the firmware libraries of GMFU for users to develop their multimedia applications quickly and easily. In the software optimization, we analyze the multimedia software to extract parallelisms and complex computations and speed them up with the proposed GMFUs. UniCore visoMT processor provides the applications programming interface (API) for programmers to utilize the firmware libraries of GMFU. In addition to utilize the firmware libraries, we also optimize the multimedia software algorithmically and modify the software architecture to improve the performance. With the proposed techniques, we evaluate the UniCore visoMT processor using a broad range of media kernels and show that its performance achieves encoding/decoding 30/70 frames per second of MPEG-4 video Codec and encoding 17 frames per second of H.264 video in CIF (352x288) resolution at the clock rate of 200 MHz.
張維軒. "Discuss the Carbon Dioxide Density Change and the optimization operation of multimedia classroom". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/07172102748235596665.
Texto completo明新科技大學
土木工程與環境資源管理研究所
100
Indoor air quality is good or bad in the classroom for students to attend class or learn a considerable impact, the student about 10 hours a day in the campus, of which about 8 hours of time in the classroom, therefore indoor air quality healthy learning environment for students should be of considerable attention in the classroom. The purpose of this study was to explore the classroom concentrations of CO2 (Carbon Dioxide), in Situation 1: Air-conditioning is not open, doors and windows open to the indoor air does not produce convection. Situation 2: air-conditioned open the doors and windows closed both case, the best time to exhaust. In this study MingHsin University of Science and Technology Department of Civil Engineering Hall of wireless communication and multimedia teaching classrooms for the experimental site, the classroom volume is 412.21m3, this study was conducted by using the CDU440 Carbon Dioxide Monitor detector, a data record every 5 minutes for 3 hours, to detect the concentration of CO2 in the classroom, through references to CO2 emissions estimate for the hardware in the classroom, final the specification in accordance with the indoor air quality, CO2 concentration recommended value of 600ppm as the evaluation criteria. The results is, in Situation 1: there are 32 people, CO2 concentration in class after 30 minutes, reach 650 ppm, has exceeded the recommended value should be opened to the exhaust fan to exhaust. In Situation 1: there are 24 people, CO2 concentration in class after 10 minutes, reach 640 ppm, has exceeded the recommended value should be opened to the external air circulation;The estimation results of the theoretical value of the carbon dioxide emissions in the human respiratory, per minute exhaled 0.603 g of CO2, measured values in the classroom for 40 people on average0.0204 (g/m3/min), the theoretical estimated value of 0.0585 (g/m3/min), 36 people when the measured value the average .0070 (g/m3/min), theoretical estimated value of .0527 (g/m3/min).
Jeng, I.-Horng y 鄭一鴻. "Design and Implementation of ASIP Hardware/Software Codesign Environment and Optimization on Multimedia Applications". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/82479706112191109083.
Texto completo國立臺灣大學
電機工程學研究所
89
Low-power, high-throughput and small-area products with a short development schedule are general design aims in the 3C (computer, communication and consumption) era. The IAs ( Information Appliances) are the typical applications which expand the desktop information applications into everywhere as small as it can exist. It is recommended that hardward and software design issues should be considered simultaneously, co-operatively and interactively. Especially for the multiple design objectives (e.g. low power, high throughput, small area, etc.), the MO ( Multicriteria Optimization) technique can be applied to make a trade-off decision. FACE/FACE++ (Fine-tuned Architecture Codesign environment/Version 1 & 2) was developed to achieve these goals, including the organization of a design flow, a frequency-driven information analyzer, compiler techniques (code generator and instruction optimization) and a hierarchical object design library. This thesis explores the design space of a retargetable compiler and a fine-tuned hardware emulator, which combine both software and hardware reprogrammability. The environment, FACE, we have developed allows us to quickly move the functions between software and hardware in a state of flux. It generates the ASIP (Application-Specific Integrated Processor) and a compiler for the new ASIP architecture. The experiment demonstrates the efficiency in ASIP design of FACE. As for the applications in the new century, many information appliance products will replace traditional electronic appliances to help people in smart, efficient and low-cost ways. These successful products must be capable of communicating multimedia information, which is embedded into the electronic appliances with high integration, innovation, and power-throughput tradeoff. We have developed a codesign procedure based on FACE, called FACE++, to analyze, compare and emulate the multimedia communication applications to find the candidate implementations under different criteria. The results show that in general, memory technology dominates the optimal tradeoff and ALU improvements impact greatly on particular applications. This thesis combines lots of technologies into the design environment to evaluate the tradeoff among multiple objectives and solves the evaluation problem efficiently and effectively.
CHANG, KDI-DI y 張凱迪. "The Optimization of Cooperative Emergency Services over IP Multimedia Subsystem with the Internet of Things". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/a5j6rt.
Texto completo國立臺灣科技大學
電機工程系
104
Since Internet Protocol (IP) is the most important protocol in Next Generation Networks (NGNs), the 3rd Generation Partnership Project (3GPP) utilizes Session Initiation Protocol (SIP) based on IP as the base and major protocol for negotiating sessions in IP Multimedia Subsystem (IMS). Unlike traditional circuit-switched network, in IMS, the media traffic flow and signaling are both delivered through IP transport, which is known as packet-switched network. The media traffic affects the signaling efficiency in the core network, due to traffic/packet collisions and the best effort packet delivery mechanism in ehternet. In addition, various emergency services based on wireless sensor network technologies have recently been proposed. However, the success of these services/networks is inherently limited by geographical restrictions, and their need to be deployed in advance. In order to overcome these problems, this thesis proposes an application level approach to enhance the service coverage and availability of emergency services, and a novel path-migration mechanism for enhancing the traffic efficiency in integrated Cooperative Emergency IMS (CE-IMS). Specifically, this thesis augments these services with All-IP network infrastructure based on an IP Multimedia Subsystem. Furthermore, the integration of IMS Emergency Services architecture with Cooperative Network technology is proposed to provide ubiquitous emergency services. The primary problems of cooperation between heterogeneous networks and IMSs are also investigated. The discussion and the experimental results of performance of the proposed CE-IMS are all examined. The simulation results also show that interference and traffic collisions can be reduced by applying the proposed path-migration mechanism, and the signaling efficiency in the core network can be improved with higher system capability and the voice quality is also guaranteed when making emergency calls. Moreover, the application of the Internet of Things (IoT) has become an emerging business in recent years. The most important concept of next-generation networks for providing a common global IT platform is combining seamless networks and networked things, objects or sensors. Thus, wireless body area networks (WBANs) are becoming mature with the widespread usage of the IoT. In order to support WBANs, the well-designed platform, scenario and emergency service flow for IoT with WBANs are necessary elements due to the sensors in a WBAN being related to wearer's life. The sensors on the body could detect bioinformatic information and medical signals, such as heartbeat and blood pressure. Thus, the integration of the IoT and network communication in daily life is important. However, there is not only a lack of common fabric for integrating the IoT with the Internet, there is also no emergency call process in the current network communication environment. In order to address such problems, the prototype integration of the IoT and an emergency call process is discussed. Then, a bootstrap platform is proposed to provide the discussion of open challenges and solutions for deploying the IoT in the Internet, and the emergency communication system is analyzed using a 3GPP IP multimedia subsystem service. Finally, the prototype for supporting a WBAN with an emergency service is also addressed, and the performance results are useful to service providers and network operators, helping them estimate their migration to the IoT by referring to this experiment.
Kropf, Carsten. "Efficient Reorganisation of Hybrid Index Structures Supporting Multimedia Search Criteria". Doctoral thesis, 2014. https://tud.qucosa.de/id/qucosa%3A30078.
Texto completoStewart, Kirk. "Automatic Task Formation Techniques for the Multi-level Computing Architecture". Thesis, 2008. http://hdl.handle.net/1807/11166.
Texto completoΠολίτης, Ηλίας. "Μελέτη βελτιστοποίησης της μετάδοσης υπηρεσιών πολυμέσων σε ετερογενή ασύρματα δίκτυα". Thesis, 2008. http://nemertes.lis.upatras.gr/jspui/handle/10889/1531.
Texto completoThe popular trend for wireless communications marks our demand for freedom and flexibility. Recently, the inherent human need for communication and sharing of ideas and experiences has been enriched with the need for wireless multimedia. Wireless multimedia communications have the ability to alter several parameters of our daily life. The great variety of offered services is only limited by the available resources of the wireless medium. The key is the capacity of the wireless medium and this research focuses on optimizing the video traffic while fully utilizing the wireless channel. This thesis introduces a new analytical method of creating synthetic MPEG-4 video streams over heterogeneous wireless networks. The aggregate video traffic generated by multiple wireless video sources is modeled by a two-dimensional Marcov chain. In order to achieve a guaranteed quality of service, a handoff mechanism is proposed based on the state transition probabilities of the statistical model. Moreover, an analytical distortion prediction model for H264/AVC coded video is presented. In order to precisely estimate the received video distortion, the proposed model utilizes the inherent characteristics of H.264/AVC coding and in particular, the correlation among neighboring video frames. The distortion prediction model’s ability to estimate the received video distortion is studied under different channel conditions. Hence, complex combinations of errors due to the wireless channel are considered in this thesis. Moreover, an analysis of video packet scheduling algorithms and traffic differentiation schemes, based on the video packet’s impact to the overall video distortion, is included. The importance of each video packet is estimated by the proposed distortion prediction model. Therefore, the transmission rate of a video source can be adapted to the varying wireless channel conditions. The evaluation of the model has been extended in order to include the study of the 802.11e standard, which incorporates mechanisms for guaranteeing quality of service. Finally, the thesis proposes algorithms for optimised video multipath routing in wireless multimedia sensor networks. A proposed extension of the LEACH protocol is implemented that ensures multipath video packet routing. Thus, significantly improved received video distortion and power consumption in the wireless sensor nodes, is achieved.
"Optimization of multimedia flows over data networks : the core location problem and the peakedness characterization/Optimisation des flux multimédias sur les réseaux de données : le problème de sélection du noeud central et la caractérisation par peakedness". Université catholique de Louvain, 2005. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-05182005-123835/.
Texto completoChen, Guan-Hong y 陳冠宏. "SoC Platform Design Optimizations for Multimedia Applications-An Example for JPEG2000 Decoders". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/13200246268824720940.
Texto completo臺灣大學
電機工程學研究所
95
Platform Architect, one of the CoWare corporation’s electronic system level design tool, can be used to build and simulate various virtual System-on-chip(SoC) platforms. This thesis explores a jpeg2000 decoder on SoC platforms that are based on Transaction-Level Modeling (TLM). We improve the system execution time by using both methods of hardware and software optimizations. In the hardware part, we refine the communication architecture and make use of master ports on the SoC platform to reduce communication time. In the software part, we enable caches, compiler options and rewriting parts of the source code for the different architectures to improve the system execution time. Finally we can get the best solution from exploring the hardware and software optimizations.
鄭孟璿. "A VILW-Based Post Compilation Framework for Multimedia Embedded DSPs with Hardware Specific Optimizations". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/52277141716129019375.
Texto completo國立清華大學
資訊工程學系
95
In the high performance and low power multimedia embedded system design, the VLIW-based embedded DSPs which need compiler to exploit the ILP become popular and play an important role today. For this reason, we need optimizing embedded DSP compilers that can generate capable code with efficiency in terms of performance, power, area, and productivity in order to use embedded DSPs effectively. With exploiting the specific hardware feature of DSPs, the embedded DSP compilers can avoid designer to optimize applications on hand which will increase the time-to-market without lost performance. In this paper, we show that using the proposed post compilation framework, we can exploit hardware specific features of DSPs with runtime information to optimize the results of other compilers. In the simulation results, we demonstrate that the proposed framework can optimize the programs optimized by another compiler Blackfin GCC 3.4 and VDSP++ 4.5 with optimization level 3 and get additional 17.56% and 8.8% performance on average. We also can get additional 5.8% performance on average of the real multimedia program H.264 which is optimized by hand-turned DSP library.