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1
Fricke, Mark Rolf. "Framework or the development of telecommunications within an interoperator environment within the SADC". Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-01312005-142741.
Testo completo
2
List, Robert S. "A rendering system independent high level architecture implementation for networked virtual environments". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FList.pdf.
Testo completoAbstract (sommario):
Thesis (M.S. in Computer Science)--Naval Postgraduate School, September 2002.Thesis advisor(s): Rudolph P. Darken, Joseph A. Sullivan. Includes bibliographical references (p. 53-54). Also available online.
3
Hasni, Neji. "Towards an interoperability ontology for software development tools". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FHasni.pdf.
Testo completoAbstract (sommario):
Thesis (M.S. in Computer Science)--Naval Postgraduate School, March 2003.Thesis advisor(s): Shing Man-Tak, Joseph Pruett, Richard Riehle. Includes bibliographical references (p. 249-252). Also available online.
4
Lawler, George M. "Distributed architecture for the object-oriented method for interoperability". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FLawler.pdf.
Testo completo
5
Corsano, Scott E. "Joint fires network ISR interoperability requirements within a joint force architecture". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FCorsano.pdf.
Testo completo
6
Jagatheesan, Arun Swaran. "Architecture and protocols for Sangam communities and Sangam e-services broker". [Gainesville, Fla.] : University of Florida, 2001. http://etd.fcla.edu/etd/uf/2001/anp1601/ArunFinal.pdf.
Testo completoAbstract (sommario):
Thesis (M.S.)--University of Florida, 2001.Title from first page of PDF file. Document formatted into pages; contains x, 69 p.; also contains graphics. Vita. Includes bibliographical references (p. 66-68).
7
Liu, Xiaoli. "A code generation approach to support dynamic workflow management". [Gainesville, Fla.] : University of Florida, 2001. http://purl.fcla.edu/fcla/etd/UFE0000330.
Testo completoAbstract (sommario):
Thesis (M.S.)--University of Florida, 2001.Title from title page of source document. Document formatted into pages; contains x, 73 p.; also contains graphics. Includes vita. Includes bibliographical references.
8
Pathan, Al-Mukaddim Khan. "Utility-oriented internetworking of content delivery networks". Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/7039.
Testo completoAbstract (sommario):
Today’s Internet content providers primarily use Content Delivery Networks (CDNs) to deliver content to end-users with the aim to enhance their Web access experience. Yet the prevalent commercial CDNs, operating in isolation, often face resource over-provisioning, degraded performance, and Service Level Agreement (SLA) violations, thus incurring high operational costs and limiting the scope and scale of their services.To move beyond these shortcomings, this thesis sets out to establish the basis for developing advanced and efficient content delivery solutions that are scalable, high performance, and cost-effective. It introduces techniques to enable coordination and cooperation between multiple content delivery services, which is termed as “CDN peering”. In this context, this thesis addresses five key issues ― when to peer (triggering circumstances), how to peer (interaction strategies), whom to peer with (resource discovery), how to manage and enforce operational policies (re-quest-redirection and load sharing), and how to demonstrate peering applicability (measurement study and proof-of-concept implementation).
Thesis Contributions: To support the thesis that the resource over-provisioning and degraded performance problems of existing CDNs can be overcome, thus improving Web access experience of Internet end-users, we have:
- identified the key research challenges and core technical issues for CDN peering, along with a systematic understanding of the CDN space by covering relevant applications, features and implementation techniques, captured in a comprehensive taxonomy of CDNs;
- developed a novel architectural framework, which provides the basis for CDN peering, formed by a set of autonomous CDNs that cooperate through an interconnection mechanism, providing the infrastructure and facilities to virtualize the service of multiple providers;
- devised Quality-of-Service (QoS)-oriented analytical performance models to demonstrate the effects of CDN peering and predict end-user perceived performance, thus facilitating to make concrete QoS performance guarantees for a CDN provider;
- developed enabling techniques, i.e. resource discovery, server selection, and request-redirection algorithms, for CDN peering to achieve service responsiveness. These techniques are exercised to alleviate imbalanced load conditions, while minimizing redirection cost;
- introduced a utility model for CDN peering to measure its content-serving ability by capturing the traffic activities in the system and evaluated through extensive discrete-event simulation analysis. The findings of this study provide incentive for the exploitation of critical parameters for a better CDN peering system design; and
- demonstrated a proof-of-concept implementation of the utility model and an empirical measurement study on MetaCDN, which is a global overlay for Cloud-based content delivery. It is aided with a utility-based redirection scheme to improve the traffic activities in the world-wide distributed network of MetaCDN.
9
Halle, Robert F. "Extensible Markup Language (XML) based analysis and comparison of heterogeneous databases". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA393736.
Testo completoAbstract (sommario):
Thesis (M.S. in Software Engineering) Naval Postgraduate School, June 2001.Thesis advisor(s): Berzins, Valdis. "June 2001." Includes bibliographical references (p. 137-138). Also Available online.
10
Ehrig, Marc. "Ontology alignment : bridging the semantic gap /". New York, NY : Springer, 2007. http://www.loc.gov/catdir/toc/fy0707/2006928852.html.
Testo completo
11
Love, Damon S. "Fast switch scheduling in the multimedia router". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/14960.
Testo completo
12
Lucas, Julie A. "Ensuring a C2 level of trust and interoperability in a networked Windows NT environment". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA319428.
Testo completoAbstract (sommario):
Thesis (M.S. in Information Technology Management) Naval Postgraduate School, September 1996.Thesis advisor(s): Gus K. Lott, Cynthia E. Irvine, Rex Buddenberg. "September 1996." Includes bibliographical references (p. 135-140). Also available online.
13
Nayar, Ajith. "Interoperability in online travel distribution an investigation of the adoption of Open Travel Alliance (OTA) standards /". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 160 p, 2007. http://proquest.umi.com/pqdweb?did=1253510061&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Testo completo
14
Pradeep, Kris. "XML as a data exchange medium for DoD legacy databases". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FPradeep.pdf.
Testo completo
15
Neushul, James D. "Interoperability, data control and battlespace visualization using XML, XSLT and X3D". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FNeushul.pdf.
Testo completoAbstract (sommario):
Thesis (M.S. in Computer Science)--Naval Postgraduate School, September 2003.Thesis advisor(s): Don Brutzman, Curtis L. Blais. Includes bibliographical references (p. 161-176). Also available online.
16
Wang, Hongzheng. "Performance analysis of cooperative systems with spatial random relays and interfering nodes". Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B44205041.
Testo completo
17
Foo, Justin. "Exploiting multiuser diversity with capture in wireless networks". University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0168.
Testo completoAbstract (sommario):
In a wireless network, owing to the time-varying nature of wireless channels, different mobile users typically experience peaks and troughs in channel quality at different times. This diversity in channel quality is known as multiuser diversity. With the aid of rate adaptation, multiuser diversity can be exploited by allowing the mobile user with the best channel to use the channel resource. However, in order to achieve this in most practical systems, the mobile users in the network must feed back their channel state information (CSI) to the transmitting user. In large networks, this feedback overhead can outweigh the multiuser diversity gain. In this thesis dissertation, a centralised wireless medium access control (MAC) scheme, namely Multiuser Diversity with Capture (MDC), is discussed as a solution to obviate the overhead problem. MDC explicitly employs the capture effect in radio receivers to reduce network overhead by allowing multiple mobile stations (MSs) with channels better than a nominal response threshold to simultaneously compete for the wireless channel. Owing to the capture effect, the base station (BS) can determine which MS has the best channel. In comparison with the Medium Access Diversity (MAD) scheme in the literature, the proposed MDC possesses the strong merit that the feedback overhead is independent of the number of MSs in the network. Several aspects of the MDC scheme are investigated in detail. An application of the MDC scheme based on the physical layer and parts of the MAC layer of the IEEE 802.11a standard is considered. A general analytical framework for the goodput performance of MDC is derived. Using this framework, the exact closed form solution for the expected goodput of MDC with rate adaptation over Rayleigh fading channels is calculated. The fairness performance of MDC in networks where some MSs experience better average channel conditions than others is also addressed. MSs with low average channel states tend to use the channel less often in MDC than MSs with high average channel states. This issue is tackled with Fairer Multiuser Diversity with Capture (FMDC), a variant of the MDC scheme designed to share the channel resource more equitably across all of the MSs in the network. In FMDC, instead of using the network-wide response threshold to decide whether to compete for the channel, each MS only competes for the channel when their channel state is greater than a threshold factor multiplied by their average channel state. Finally, the problem of adaptive optimisation of the response threshold for MDC and the threshold factor for FMDC is also considered. In the proposed solution, the response threshold and the threshold factor are adapted heuristically according to the estimated goodput performance of the system. The adaptive heuristic has importance in practical systems because the BS usually does not know the characteristics of the time varying channels of the MSs in the network.
18
Wang, Hongzheng, e 王宏征. "Performance analysis of cooperative systems with spatial random relaysand interfering nodes". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44205041.
Testo completo
19
Bozek, Matthew Peter. "Express lanes modification to the data vortex photonic all-optical path interconnection network". Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24680.
Testo completoAbstract (sommario):
Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.Committee Chair: Wills, D. Scott; Committee Member: Keezer, David; Committee Member: Yalamanchili, Sudhakar
20
Frean, Isobel. "Modelling communication requirements in aged care using HL7 V3 methods". Access electronically, 2006. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070221.131236/index.html.
Testo completo
21
Young, Paul E. "Heterogeneous software system interoperability through computer-aided resolution of modeling differences". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FYoung%5FPaul%5FPhD.pdf.
Testo completo
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Li, Jonathan Chi Fai. "Eye closure penalty based signal quality metric for intelligent all-optical networks /". Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/7047.
Testo completo
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Knight, Clinton D. "WWW-based testing of analog circuits". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/14863.
Testo completo
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Dong, Lina 1980 Zeng Wenjun. "Video adaptation for IPTV applications". Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6666.
Testo completoAbstract (sommario):
Title from PDF of title page (University of Missouri--Columbia, viewed on March 10, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Thesis advisor: Dr. Wenjun Zeng. Includes bibliographical references.
25
McGovern, Susan C. "Information security requirements for a coalition wide area network". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA397542.
Testo completoAbstract (sommario):
Thesis (M.S. in Systems Technology (Command, Control, and Communications)) Naval Postgraduate School, June 2001.Thesis advisor(s): Irvine, Cynthia E. "June 2001." Includes bibliographical references (p. 77-78). Also available online.
26
Thome, Geoffrey D. "U.S. Marine specific software interoperability requirements of the AFATDS and IOS software suites". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FThome.pdf.
Testo completoAbstract (sommario):
Thesis (M.S. in Information Technology Management and M.S. in Software Engineering)--Naval Postgraduate School, September 2002.Thesis advisor(s): John Osmundson, Richard Riehle. Includes bibliographical references (p. 119-123). Also available online.
27
Rattananon, Sanchai Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "RPX ??? a system for extending the IPv4 address range". Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2006. http://handle.unsw.edu.au/1959.4/30210.
Testo completoAbstract (sommario):
In recent times, the imminent lack of public IPv4 addresses has attracted the attention of both the research community and industry. The cellular industry has decided to combat this problem by using IPv6 for all new terminals. However, the success of 3G network deployment will depend on the services offered to end users. Currently, almost all services reside in the IPv4 address space, making them inaccessible to users in IPv6 networks. Thus, an intermediate translation mechanism is required. Previous studies on network address translation methods have shown that Realm Base Kluge Address Heuristic-IP, REBEKAH-IP supports all types of services that can be offered to IPv6 hosts from the public IPv4 based Internet, and provides excellent scalability. However, the method suffers from an ambiguity problem which may lead to call blocking. This thesis presents an improvement to REBEKAH-IP scheme in which the side effect is removed, creating a robust and fully scalable system. The improvement can be divided into two major tasks including a full investigation on the scalability of addressing and improvements to the REBEKAH-IP scheme that allow it to support important features such as ICMP and IP mobility. To address the first task a method called REBEKAH-IP with Port Extension (RPX) is introduced. RPX is extended from the original REBEKAH-IP scheme to incorporate centralised management of both IP address and port numbers. This method overcomes the ambiguity problem, and improves scalability. We propose a priority queue algorithm to further increase scalability. Finally, we present extensive simulation results on the practical scalability of RPX with different traffic compositions, to provide a guideline of the expected scalability in large-scale networks. The second task concerns enabling IP based communication. Firstly, we propose an ICMP translation mechanism which allows the RPX server to support important end-toend control functions. Secondly, we extend the RPX scheme with a mobility support scheme based on Mobile IP. In addition, we have augmented Mobile IP with a new tunneling mechanism called IP-in-FQDN tunneling. The mechanism allows for unique mapping despite the sharing of IP addresses while maintaining the scalability of RPX. We examine the viability of our design through our experimental implementation.
28
Ribes, David. "Universal informatics building cyberinfrastructure, interoperating the geosciences /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3237063.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--University of California, San Diego, 2006.Title from first page of PDF file (viewed December 7, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 447-467).
29
Martins, Indayara Bertoldi. "Analise de trafego, capacidade e proteção em redes de pacotes opticos com chaveamento fotonico". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258937.
Testo completoAbstract (sommario):
Orientadores: Edson Moschim, Felipe Rudge BarbosaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Neste trabalho investigamos o desempenho de redes ópticas avançadas, em particular redes de chaveamento de pacotes ópticos (Optical Packet Switching Network-OPSN), constituídos por arquiteturas com topologias em malha e nós ópticos sem armazenador. Utilizou-se distribuição de tráfego uniforme, na qual todos os nós geram a mesma quantidade de tráfego para todos os outros nós. Foram avaliados vários parâmetros de redes OPSN, principalmente número médio de saltos e capacidade efetiva da rede, bem como comparações entre topologias anel e malha, considerando como parâmetros principais vazão e desempenho, e os impactos causados por falhas de enlaces. Demonstrouse também que o aumento do número de nós em OPSNs, não necessariamente aumenta o desempenho ou capacidade
Abstract: In this work we have investigated the performance of advanced optical networks, more specifically optical packet switched networks (OPSN), with architectures comprising fully connected mesh topologies and optical bufferless nodes. We have adopted uniform traffic distribution, in which all nodes generate the same traffic to every other node. Several parameters of the OPSNs have been evaluated, mainly average number of hops and effective network capacity, as well as comparisons between the ring and mesh network topologies, considering as main parameters the network throughput and performance, and the impacts caused by failures of links. We demonstrate that increasing the number of nodes in OSPNs does not necessarily increase performance or capacity
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
30
Paliwal, Gaurav. "Convergence : the next big step /". Online version of thesis, 2006. https://ritdml.rit.edu/dspace/handle/1850/1316.
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Hawkins, William Cory. "Evaluation of the data vortex photonic all-optical path interconnection network for next-generation supercomputers". Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-12182006-155304/.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2007.Dr. Henry L. Owen III, Committee Member ; Dr. David Keezer, Committee Member ; Dr. D. Scott Wills, Committee Chair.
32
Harrington, Brian. "A Netcentric Scientific Research Repository". Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5611/.
Testo completoAbstract (sommario):
The Internet and networks in general have become essential tools for disseminating in-formation. Search engines have become the predominant means of finding information on the Web and all other data repositories, including local resources. Domain scientists regularly acquire and analyze images generated by equipment such as microscopes and cameras, resulting in complex image files that need to be managed in a convenient manner. This type of integrated environment has been recently termed a netcentric sci-entific research repository. I developed a number of data manipulation tools that allow researchers to manage their information more effectively in a netcentric environment. The specific contributions are: (1) A unique interface for management of data including files and relational databases. A wrapper for relational databases was developed so that the data can be indexed and searched using traditional search engines. This approach allows data in databases to be searched with the same interface as other data. Fur-thermore, this approach makes it easier for scientists to work with their data if they are not familiar with SQL. (2) A Web services based architecture for integrating analysis op-erations into a repository. This technique allows the system to leverage the large num-ber of existing tools by wrapping them with a Web service and registering the service with the repository. Metadata associated with Web services was enhanced to allow this feature to be included. In addition, an improved binary to text encoding scheme was de-veloped to reduce the size overhead for sending large scientific data files via XML mes-sages used in Web services. (3) Integrated image analysis operations with SQL. This technique allows for images to be stored and managed conveniently in a relational da-tabase. SQL supplemented with map algebra operations is used to select and perform operations on sets of images.
33
Goyal, Mukul. "Internet Traffic Engineering: QoS Translation and Survivability". Columbus, OH : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1047407545.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--Ohio State University, 2003.Title from first page of PDF file. Document formatted into pages; contains xxi, 271 p.: ill. Includes abstract and vita. Advisors: Ming T. Liu and Wu-chi Feng, Dept. of Computer and Information Science. Includes bibliographical references (p. 261-271).
34
Rathnam, Tarun. "Using Ontologies to Support Interoperability in Federated Simulation". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4788.
Testo completoAbstract (sommario):
A vast array of computer-based simulation tools are used to support engineering design and analysis activities. Several such activities call for the simulation of various coupled sub-systems in parallel, typically to study the emergent behavior of large, complex systems. Most sub-systems have their own simulation models associated with them, which need to interoperate with each other in a federated fashion to simulate system-level behavior. The run-time exchange of information between federate simulations requires a common information model that defines the representation of simulation concepts shared between federates. However, most federate simulations employ disparate representations of shared concepts. Therefore, it is often necessary to implement transformation stubs that convert concepts between their common representation to those used in federate simulations. The tasks of defining a common representation for shared simulation concepts and building translation stubs around them adds to the cost of performing a system-level simulation.
In this thesis, a framework to support automation and reuse in the process of achieving interoperability between federate simulations is developed. This framework uses ontologies as a means to capture the semantics of different simulation concepts shared in a federation in a formal, reusable fashion. Using these semantics, a common representation for shared simulation entities, and a corresponding set of transformation stubs to convert entities from their federate to common representations (and vice-versa) are derived automatically. As a foundation to this framework, a schema to enable the capture of simulation concepts in an ontology is specified. Also, a graph-based algorithm is developed to extract the appropriate common information model and transformation procedures between federate and common simulation entities.
As a proof of concept, this framework is applied to support the development of a federated air traffic simulation. To progress with the design of an airport, the combined operation of its individual systems (air traffic control, ground traffic control, and ground-based aircraft services) in handling varying volumes of aircraft traffic is to be studied. To do so, the individual simulation models corresponding to the different sub-systems of the airport need to be federated, for which the ontology-based framework is applied.
35
Mascarenhas, da Veiga Alves Manoel Eduardo. "Characterisation of end-to-end performance for web-based file server respositories". Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09ENS/09ensm395.pdf.
Testo completoAbstract (sommario):
Bibliography: leaves 128-135. Investigates the behaviour of TCP bulk file transfer application sessions in a broadband access environment. Introduces some concepts for evaluating network behaviour: a path instability parameter for analyzing different TCP connections; a minimum RTT delay and a minimum typical path for estimating path characteristics between a client and application servers.
36
Moyo, Thamsanqa. "An investigation into interoperable end-to-end mobile web service security". Thesis, Rhodes University, 2008. http://eprints.ru.ac.za/1137/.
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Wasinger, Rainer. "Multimodal interaction with mobile devices: fusing a broad spectrum of modality combinations". Berlin Aka, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2890796&prov=M&dok_var=1&dok_ext=htm.
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Oliveira, Vinicius Garcia de. "Arquitetura e implementação de uma rede em anel de comutação optica de pacotes". [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/322006.
Testo completoAbstract (sommario):
Orientadores: Peter Jurgen Tatsch, Marcos Rogerio SalvadorDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: A convergência das aplicações, dos serviços e das redes de telecomunicação está mudando o mundo e o jeito como as pessoas agem e interagem. Embora com limitações, computação distribuída, teleconferência, tele-educação rádio, televisão e jogos já são possíveis na Internet. É razoável propor que em um futuro próximo estas limitações tendam a desaparecer e será possível suportar aplicações bem mais sofisticadas e complexas, tais como realidade virtual e tele-presença. ...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital.
Abstract: The convergence of the services, applications and telecommunication networks is changing the way people do their things and interact to each other. With limitations, distributed computing, teleconference, tele-education, radio, television and games are already possible through the Internet. In a close future these limitations probably will disappear and it will be possible to provide new and more sophisticated applications as virtual reality and tele-presence....Note: The complete abstract is available with the full electronic document
Mestrado
Telecomunicações
Mestre em Engenharia Elétrica
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Pereira, Tatiana Brito. "Uma estrategia de roteamento OSPF adaptativo baseado em estimação de banda". [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259284.
Testo completoAbstract (sommario):
Orientador: Lee Luan LingDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: O crescimento explosivo e a natureza heterogênea da Internet demandam ferramentas ¿inteligentes¿ que permitam aos protocolos de roteamento adaptarem-se à situação corrente da rede (topologia e situação de congestionamento). Ferramentas inteligentes, porém, significam, na maioria das vezes, grande sobrecarga de processamento e comunicação. O presente trabalho apresenta, além de uma nova estratégia de roteamento OSPF adaptativo baseado em estimação de banda, uma plataforma de simulação capaz de expor o desempenho de uma rede de interconexão submetida (ou não) a esta nova estratégia. A avaliação de desempenho é realizada graças a um modelo, desenvolvido no simulador OPNET, que adiciona ao modelo de um roteador os módulos para estimação de banda e atualização de custos. Os módulos (de estimação de banda e de atualização de custo) adicionados permitem que o protocolo OSPF tome suas decisões de roteamento baseando-se nas condições de congestionamento da rede e nos índices de qualidade desejados para os enlaces. Neste ambiente de simulação, a topologia da rede é representada por um grafo e o tráfego, a que estará sujeita a rede, durante o período de simulação, é especificado por funções de distribuição que atuam durante um intervalo determinado em um roteador específico da rede. A possibilidade de se estabelecer diversas funções de geração de tráfego, atuando a partir de diversos pontos da rede em intervalos independentes, garante certa representação do dinamismo do tráfego encontrado nas redes atuais. Como resultado das simulações, temos uma análise do impacto desta estratégia adaptativa em parâmetros de desempenho de rede, em comparação com o impacto do roteamento OSPF tradicional
Abstract: Internet increase and diversity demand ¿smart¿ tools that could make possible to routing protocols self-adapt to network current state (its topology and congestion situation). Smart tools, although, can result in great processing and communication overload. This work presents, besides a new adaptive OSPF routing strategy based on bandwidth estimations, a simulation platform able to expose results of network performance while experimenting (or not) the proposed adaptive routing strategy. The performance analysis is accomplished due to a model, developed in OPNET network simulator, that adds to a router model modules to bandwidth estimation and link cost updating. These additional modules allow OSPF protocol to take its routing decisions based on network link conditions and on desired link qualities. Network topology is represented by a graph and the traffic presented during simulation is specified by distribution functions acting in specific routers during established intervals. The possibility of configuring various traffic generation functions, acting from various network points in independent intervals, ensures certain network traffic dynamic representation. The simulation results offer an analysis of the proposed OSPF adaptive routing strategy, in comparison to the conventional OSPF routing, in terms of network performance parameters
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
40
Garcia, Marcos Eduardo Coelho. "Metodo de analise de trafegos VoIP sobrepostos". [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259459.
Testo completoAbstract (sommario):
Orientador: Leonardo de Souza MendesDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: O comportamento de tráfegos VoIP em enlaces de rede é abordado neste trabalho. As aplicações VoIP possuem requisitos rígidos de Qualidade de Serviço (QoS) que devem ser previstos no projeto da rede. Neste sentido, é apresentado o Processo Poissoniano Modulado por Markov (MMPP) como um processo de chegadas adequado para caracterizar o comportamento de tráfegos VoIP sobrepostos. É levado em conta que as aplicações VoIP usam o mecanismo Supressão de Silêncio para economizar largura de banda, o que torna o tráfego muito variável e com chegadas em rajadas. Para análise do comportamento do enlace, é utilizado o modelo de fila MMPP/M/1. Para avaliar a viabilidade do modelo, foram feitos estudos comparativos com resultados do simulador ns-2.
Abstract: The behavior of VoIP traffic in network links is addressed in this work. VoIP applications have strict requirements for quality of service (QoS) that should be provided for in the network design. In this sense, the Markov Modulated Poisson Process (MMPP) is displayed as model of process of arrivals that is appropriate to characterize the behavior of superposition of VoIP traffic sources. It is taken into account that VoIP applications use the mechanism Suppression of Silence to save bandwidth, which makes the traffic very variable and with bursty arrivals. In order to analyze the behavior of the link, the MMPP/M/1 queue model is used. To evaluate the viability of the model, comparative studies were made with results of the ns-2 simulator.
Mestrado
Telecomunicações
Mestre em Engenharia Elétrica
41
Fagerland, Bruce O., Y. S. Fu e Myung W. Suh. "Telecommunications internetworking and integration: a primer for C3 students". Thesis, Monterey, California: Naval Postgraduate School, 1993. http://hdl.handle.net/10945/24235.
Testo completo
42
Nguyen, Cong Duc. "Creation and distribution of real-time content a case study in provisioning immersive voice communications to networked games /". Access electronically, 2006. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070110.164837/index.html.
Testo completo
43
Roberts, Christopher Lee. "Information Technology Project Management of the New College of Education Facility at Western Kentucky University". TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1362.
Testo completoAbstract (sommario):
Information Technology (IT) Project Management methodologies are numerous, often varying from organization to organization, and sometimes from project to project within the same organization. Although project type and scope can be a powerful indicator of what methodologies may work best for a given project, choosing which methodology to use can be daunting for project teams. At times, even after due diligence has been practiced to identify the management options available for a given project, there may not be a perfect fit. At such times, or when a formal methodology does not exist in an organization or project management office, the best approach for a project may be to utilize a collective of “best practices,” instead of a concrete methodology. When tasked with the IT Project Management of the new Gary Ransdell Hall on WKU’s main campus, the IT Project Manager (PM) did not have a tried-and-true methodology to use for managing the project. As a result, the IT PM and project team chose to research best practices, as reflected in the Project Management Body of Knowledge (PMBOK), to formulate a project plan that would maximize efficiency while protecting the triple constraints. Early in this paper, the author outlines assumptions, constraints, and risks that faced the IT team throughout the project cycle. Afterwards, the resulting methods and procedures used to manage the IT scope for the project are discussed, with figures included for reference. Next, a brief project summary is included to summarize the results of the project, with performance and scope metrics and limited end-user feedback. Finally, the lessons learned section outlines changes that have been implemented since project completion, as part of a continuous improvement effort by the WKU IT Division.
44
Martins, Indayara Bertoldi. "Análise de desempenho e proteção em redes ópticas convergentes com chaveamento fotônico". [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260715.
Testo completoAbstract (sommario):
Orientadores: Edson Moschim, Felipe Rudge BarbosaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: Neste trabalho investiga-se através de simulação computacional, o desempenho de Redes Ópticas Avançadas, usando tecnologia de Chaveamento de Pacotes Ópticos (Optical Packet Switching - OPS), com topologias em anel e malha, e nós ópticos com roteamento sem conversão eletro-óptica dos pacotes, e sem armazenadores na camada óptica de transporte. São analisados parâmetros como capacidade da rede, vazão efetiva, número médio de saltos, e fração de perda de pacotes; introduz-se também um novo fator de desempenho da rede. São propostas novas configurações para as topologias analisadas, as quais se revelaram com melhor desempenho que as tradicionais. Constatou-se que a aplicação de armazenadores eletrônicos (buffers) na interface de entrada/saída do cliente (ingresso/egresso à rede) praticamente eliminou a perda de pacotes ópticos. A fim de subsidiar planejamento para proteção da rede, analisa-se o impacto de falha de enlaces e de nós no desempenho das varias arquiteturas analisadas. A rede em malha é a que sempre apresenta os melhores resultados. Foi também feita uma avaliação dos modelos de redes adotados para tráfego IP, visando aplicação na convergência de redes de fibras e redes sem-fio (wireless-fiber). Uma conclusão importante deste trabalho é que o grau de conexões dos nós das redes é mais relevante para capacidade e desempenho do que apenas o número de nós da rede. Este trabalho não analisa limitações físicas de transmissão porque focaliza redes metropolitanas de acesso, com os pacotes ópticos nunca percorrendo distâncias superiores a 60 ou 70 km
Abstract: In this work the performance of advanced optical networks was investigated through computational simulations using optical packet switching (OPS) technology, with mesh and ring topologies. Routing in the optical nodes is carried out without electro-optical conversion of the optical packets and buffering is not used on the optical layer. The analyses are based on the network parameters capacity, throughput, average number of hops, packet loss fraction; an additional performance factor is introduced in this work. New network and node configurations are proposed and analyzed, and it was verified that they perform better than traditional topologies. It was verified that the application of electronic buffer on end-client input and output interfaces (ingress/egress of the optical network) practically eliminate optical packet loss, which mostly occur at input to the optical layer. In order to subsidize the network protection planning, analyses of the impact of link and node failure in the various architectures was studied. The mesh network obtained the best results in all situations. A network model adopted for IP traffic was also evaluated in order to consider the adequacy of our models to this traffic and the convergence of fiber networks and wireless networks (wireless-fiber). Important conclusions are that the models are simple and perform very well under various conditions, and that the degree of interconnection of the nodes is more relevant for capacity and performance than just the number of network nodes. Actually in some cases it is better to increase connectivity than number of nodes. Finally, this work does not analyze the physical limitations of transmission because it focuses on metropolitan access networks, with optical packets having a limited number of hops and never exceeding distances greater than 60 or 70 km
Doutorado
Telecomunicações e Telemática
Doutor em Engenharia Elétrica
45
Tessier, Sean Michael. "Ontology-based approach to enable feature interoperability between CAD systems". Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41118.
Testo completoAbstract (sommario):
Data interoperability between computer-aided design (CAD) systems remains a major obstacle in the information integration and exchange in a collaborative engineering environment. The standards for CAD data exchange have remained largely restricted to geometric representations, causing the design intent portrayed through construction history, features, parameters, and constraints to be discarded in the exchange process. In this thesis, an ontology-based framework is proposed to allow for the full exchange of semantic feature data. A hybrid ontology approach is proposed, where a shared base ontology is used to convey the concepts that are common amongst different CAD systems, while local ontologies are used to represent the feature libraries of individual CAD systems as combinations of these shared concepts. A three-branch CAD feature model is constructed to reduce ambiguity in the construction of local ontology feature data. Boundary representation (B-Rep) data corresponding to the output of the feature operation is incorporated into the feature data to enhance data exchange.
The Ontology Web Language (OWL) is used to construct a shared base ontology and a small feature library, which allows the use of existing ontology reasoning tools to infer new relationships and information between heterogeneous data. A combination of OWL and SWRL (Semantic Web Rule Language) rules are developed to allow a feature from an arbitrary source system expressed via the shared base ontology to be automatically classified and translated into the target system. These rules relate input parameters and reference types to expected B-Rep objects, allowing classification even when feature definitions vary or when little is known about the source system. In cases when the source system is well known, this approach also permits direct translation rules to be implemented. With such a flexible framework, a neutral feature exchange format could be developed.
46
Ahuja, Amit. "A Dynamic Attribute-Based Load Shedding and Data Recovery Scheme for Data Stream Management Systems". Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1362.pdf.
Testo completo
47
Lam, Iok Ham. "Collaborative semantic editing of heterogeneous hierarchical concepts". Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2148261.
Testo completo
48
Ribeiro, Thatiane Cristina dos Santos de Carvalho 1982. "Analise de desempenho de transmissão de video em redes IEEE 802.11 visando a estruturação de canais de retorno para TV digital". [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261690.
Testo completoAbstract (sommario):
Orientador: Yuzo IanoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: A transmissão de vídeo em redes Wireless é abordada pela pesquisa, devido o grande aumento na utilização dessas redes na ultima década. O acesso à banda larga por essas redes é feito de forma eficiente, rápida e com baixo custo de implementação e manutenção da rede. A motivação para o desenvolvimento é utilizar essas redes e a rede IPTV para promover a interatividade e uma forma do canal de retorno para Sistemas de Televisão Digital, que estão sendo implementadas atualmente no Brasil. O canal de Retorno da TV Digital é importante para o sistema, pois um dos objetivos é prover a interatividade entre os usuários. Isso deve ser feito de forma simples com baixo custo e com tecnologia compatível a região do usuário. A simulação trata de um sistema de transmissão unicast que seria semelhante a uma interatividade local e dedicada. O usuário transmite o conteúdo de uma só vez. Os dados que são transmitidos pela provedora de serviços, são armazenados no set-top-box, e só são modificados em caso de novo fluxo de dados, quando há atualização ou acesso a nova área de serviços. Os testes feitos durante a pesquisa, transmitem conteúdo em tempo real e avaliam de forma quantitativa o desempenho das redes IEEE 802.11b e IEEE 802.11g.
Abstract: The streaming video transmission on Wireless networks is concerned in the research due to the large increase in the use of such networks in the last decade. Broadband access for these networks is made efficiently, quickly and with low implementation and maintenance costs of the network. The motivation for developing this research is to use these networks and IPTV network to promote interactivity and a return channel for digital television system, currently being implemented in Brazil. The return channel is important for the Digital TV system, because one of the goals is to provide interactivity for the users. This should be done in a simple, low cost way and with technology compatible in the region of the user. The simulation deals with a unicast transmission system which is similar to a local and dedicated interactivity. The user transmits all the contents at once. The data transmitted by a service provider are stored on set-top box and are modified only in case of new data flow, when there are updates or access to new area of services. The tests performed during the research, it was broadcasted contents in real time and evaluated quantitative the performance of IEEE 802.11b and IEEE 802.11g networks.
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
49
Sazima, Ricardo. "PLEX MPLS : analise, projeto e implementação de uma plataforma para experimentos com MPLS com suporte a QoS". [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259128.
Testo completoAbstract (sommario):
Orientador: Mauricio Ferreira MagalhãesDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-04T17:32:51Z (GMT). No. of bitstreams: 1 Sazima_Ricardo_M.pdf: 1107563 bytes, checksum: a1179beaec699c0dcd87b45284e4a99c (MD5) Previous issue date: 2004
Resumo: Dados a banda de transmissão atualmente disponível, o protocolo (IP) utilizado para transmitir a maior parte de tráfego e a quantidade de tráfego e seus requisitos de aos, a Engenharia de Tráfego (TE, de Traffic Engineering) tomou-se um componente cada vez mais importante nas redes de comunicações. O padrão do IETF para enncaminhamento roteamento entitulado Multi-Protocol Label Switching (MPLS) preenche lacunas importantes neste cenário e é peça chave das metodologias de TE mais sofisticadas. Nesta dissertação é apresentado um modelo genérico de TE e uma proposta para uma Plataforma para Experimentos com MPLS (PLEX MPLS) que permite que o usuário defina, execute, e analise configurações de Engenharia de Tráfego com MPLS em uma rede IP. Os principais objetivos da PLEX MPLS são: . Estudo da tecnologia MPLS e suporte a outros trabalhos em andamento no contexto do grupo de estudos em MPLS do DCA . Experimentos com engenharia de tráfego com MPLS: validação das tecnologias e conceitos relacionados . Experimentos didáticos em disciplinas de laboratório de redes. Os principais conceitos de TE e MPLS são apresentados como referência, bem como uma descrição do NIST Switch, a plataforma MPLS escolhida para este trabalho. A análise, projeto e implementação da PLEX MPLS são apresentados, pois formam parte significativa do trabalho desenvolvido. A PLEX não só utiliza, como também estende as funcionalidades oferecidas pelo NIST Switch a fim de oferecer um esquema de TE mais completo e eficiente. Na fase de análise, vemos quais os principais requisitos para a implementação desta plataforma, seguindo uma metodologia de Engenharia de Software. Na fase de projeto, vemos as soluções propostas para os problemas identificados na fase de análise e temos uma especificação dos componentes a serem implementados. Na fase seguinte, discutimos a implementação das principais características dos componentes da PLEX, justificando as decisões tomadas. Para validar a implementação da PLEX de acordo com sua proposta, foram realizados alguns experimentos em uma rede de testes com tráfego real. A execução destes experimentos é descrita e seus resultados analisados. Os resultados obtidos assinalam claramente a importância e utilidade de esquemas de TE baseada em MPLS. Uma interessante metodologia para TE, compilada a partir de várias propostas, é apresentada. Finalmente, apontam-se caminhos a seguir em um trabalho futuro de refinamento da PLEX
Abstract: Given the bandwidth currently available, the protocol (IP) used to transmit most Internet traffic, the quantity of traffic produced and its QoS requirements, Traffic Engineering (TE) has become an increasingly important component of communications networks. IETF's standard for forwarding/routing, which is entitled Multi-Protocol Label Switching (MPLS), presents important solutions in this scenario playing a major role in more sophisticated TE methodologies. This work presents a generic methodology for TE and a proposal for a Platform for Experiments with MPLS (PLEX MPLS) which allows the user to define, execute and analyze Traffic Engineering configurations with MPLS in an IP network. The main goals of PLEX MPLS are: . Study of the M PLS technology and support of other ongoing works with M PLS in the DCA . Traffic Engineering experiments with MPLS: validation of the related concepts and technologies . Support of didactic experiments in academic disciplines. The main concepts of MPLS and TE are presented as reference, as well as a brief description of NIST Switch, the MPLS software chosen for the PLEX MPLS implementation. The analysis, project and implementation of PLEX MPLS are presented, since are significant part of the developed work. PLEX not only uses, but also extends NIST Switch functionalities to offer a more complete and efficient TE scheme. In the analysis phase the main requirements for the PLEX implementation are specified, following a well-known Software Engineering methodology. The solutions found for the problems identified in the analysis phase are presented in the project phase alongside with a specification of the components that will be implemented. In the next phase, the implementation of PLEX is discussed focusing on the most important characteristics of PLEX components and justifying the implementation ecisions. In order to validate PLEX implementation and its proposal, some experiments were made in a test network with reallive traffic. These experiments are described and its results analyzed. The results obtained clearly indicate the importance and utility of TE schemes based on MPLS. Also an interesting TE methodology compiled from several proposals is presented. Finally, possible improvements and future work on PLEX MPLS are indicated.
Mestrado
Engenharia de Computação
Mestre em Engenharia Elétrica
50
Lister, Kendall. "Toward semantic interoperability for software systems". Connect to thesis, 2008. http://repository.unimelb.edu.au/10187/3594.
Testo completoAbstract (sommario):
“In an ill-structured domain you cannot, by definition, have a pre-compiled schema in your mind for every circumstance and context you may find ... you must be able to flexibly select and arrange knowledge sources to most efficaciously pursue the needs of a given situation.” [57]In order to interact and collaborate effectively, agents, whether human or software, must be able to communicate through common understandings and compatible conceptualisations. Ontological differences that occur either from pre-existing assumptions or as side-effects of the process of specification are a fundamental obstacle that must be overcome before communication can occur. Similarly, the integration of information from heterogeneous sources is an unsolved problem. Efforts have been made to assist integration, through both methods and mechanisms, but automated integration remains an unachieved goal. Communication and information integration are problems of meaning and interaction, or semantic interoperability. This thesis contributes to the study of semantic interoperability by identifying, developing and evaluating three approaches to the integration of information. These approaches have in common that they are lightweight in nature, pragmatic in philosophy and general in application.
The first work presented is an effort to integrate a massive, formal ontology and knowledge-base with semi-structured, informal heterogeneous information sources via a heuristic-driven, adaptable information agent. The goal of the work was to demonstrate a process by which task-specific knowledge can be identified and incorporated into the massive knowledge-base in such a way that it can be generally re-used. The practical outcome of this effort was a framework that illustrates a feasible approach to providing the massive knowledge-base with an ontologically-sound mechanism for automatically generating task-specific information agents to dynamically retrieve information from semi-structured information sources without requiring machine-readable meta-data.
The second work presented is based on reviving a previously published and neglected algorithm for inferring semantic correspondences between fields of tables from heterogeneous information sources. An adapted form of the algorithm is presented and evaluated on relatively simple and consistent data collected from web services in order to verify the original results, and then on poorly-structured and messy data collected from web sites in order to explore the limits of the algorithm. The results are presented via standard measures and are accompanied by detailed discussions on the nature of the data encountered and an analysis of the strengths and weaknesses of the algorithm and the ways in which it complements other approaches that have been proposed.
Acknowledging the cost and difficulty of integrating semantically incompatible software systems and information sources, the third work presented is a proposal and a working prototype for a web site to facilitate the resolving of semantic incompatibilities between software systems prior to deployment, based on the commonly-accepted software engineering principle that the cost of correcting faults increases exponentially as projects progress from phase to phase, with post-deployment corrections being significantly more costly than those performed earlier in a project’s life. The barriers to collaboration in software development are identified and steps taken to overcome them. The system presented draws on the recent collaborative successes of social and collaborative on-line projects such as SourceForge, Del.icio.us, digg and Wikipedia and a variety of techniques for ontology reconciliation to provide an environment in which data definitions can be shared, browsed and compared, with recommendations automatically presented to encourage developers to adopt data definitions compatible with previously developed systems.
In addition to the experimental works presented, this thesis contributes reflections on the origins of semantic incompatibility with a particular focus on interaction between software systems, and between software systems and their users, as well as detailed analysis of the existing body of research into methods and techniques for overcoming these problems.