La presente tesis se inicia con el estudio de los parámetros más resaltantes de MPLS (Multi Protocol Label Switching) tecnología que nos permite afrontar los múltiples requerimientos que las nuevas aplicaciones necesitan, en especial, las aplicaciones en línea denominadas en tiempo real bajo los esquemas que la ITUT recomienda. Durante el desarrollo de esta tesis se definen escenarios de redes IP; a los cuales serán sometidos a diversos tráficos; se evaluaran los comportamientos resultantes de la interacción con estos tráficos y se comprobará la mejor alternativa tecnológica para proporcionar QoS, Ingeniería de Tráfico, transmisión óptima de información, uso de recursos de red, entre otras características que son de interés. / Tesis

by Sze Ho Pong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 50-[53]). / Abstracts in English and Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Related Work --- p.3 / Chapter 1.2 --- Contributions of the Thesis --- p.3 / Chapter 1.3 --- Organization of the Thesis --- p.4 / Chapter 2 --- Background --- p.5 / Chapter 2.1 --- Best-effort Internet - The Lossy Network --- p.5 / Chapter 2.2 --- Effects of Packet Loss on Streamed Video --- p.7 / Chapter 2.3 --- Loss Recovery Schemes in Video Streaming --- p.8 / Chapter 3 --- Comparison of Two Packet-Loss Detection Schemes --- p.10 / Chapter 3.1 --- Gap Detection (GD) --- p.12 / Chapter 3.2 --- Time-Out (TO) Detection --- p.14 / Chapter 3.3 --- Mathematical Comparison --- p.17 / Chapter 4 --- The Combined Loss-Detection Algorithm --- p.21 / Chapter 4.1 --- System Architecture --- p.22 / Chapter 4.2 --- Loss Detection and Recovery --- p.23 / Chapter 4.2.1 --- Detecting Data Packet Losses Transmitted for First Time --- p.24 / Chapter 4.2.2 --- Detecting Losses of Retransmitted Packet --- p.28 / Chapter 4.3 --- Buffering Techniques --- p.32 / Chapter 4.3.1 --- Determining Packet-Loss Rate in Presentation --- p.33 / Chapter 4.4 --- Mapping Packet-Loss Rate to Degradation of Video Quality --- p.38 / Chapter 5 --- Experimental Results and Analysis --- p.40 / Chapter 5.1 --- Experimental Setup --- p.40 / Chapter 5.2 --- Small Delay Jitter Environment --- p.42 / Chapter 5.3 --- Large Delay Jitter Environment --- p.44 / Chapter 5.3.1 --- Using Low Bit-Rate Stream --- p.44 / Chapter 5.3.2 --- Using High Bit-Rate Stream --- p.44 / Chapter 6 --- Conclusions and Future Work --- p.47 / Chapter 6.1 --- Conclusions --- p.47 / Chapter 6.2 --- Future Work --- p.49 / Bibliography --- p.50

by Yip Chung Sun Danny. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 52-54). / Abstracts in English and Chinese. / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Motivation --- p.1 / Chapter 1.2 --- Organization of Thesis --- p.5 / Chapter Chapter 2 --- Background --- p.6 / Chapter 2.1 --- Speech Codec --- p.6 / Chapter 2.2 --- RTP/UDP/IP Header Compression --- p.7 / Chapter 2.2.1 --- Real-Time Transport Protocol --- p.7 / Chapter 2.2.2 --- RTP/UDP/IP Header Compression --- p.8 / Chapter Chapter 3 --- Scenario and Assumptions --- p.10 / Chapter Chapter 4 --- Asynchronous Time Division Multiplexing Scheme --- p.14 / Chapter 4.1 --- Basic Idea --- p.14 / Chapter 4.1.1 --- Bandwidth Efficiency Improvement --- p.16 / Chapter 4.1.2 --- Delay Reduction --- p.18 / Chapter 4.2 --- Header Compression --- p.19 / Chapter 4.2.1 --- Header Compression Process --- p.21 / Chapter 4.2.2 --- Context Mapping Table --- p.23 / Chapter 4.3 --- Protocol --- p.28 / Chapter 4.3.1 --- UNCOMPRESSED_RTP Mini-Header --- p.30 / Chapter 4.3.2 --- SYNCHRONIZATION Mini-header --- p.31 / Chapter 4.3.3 --- COMPRESSED´ؤRTP Mini-header --- p.32 / Chapter 4.4 --- Connection Establishment --- p.33 / Chapter 4.4.1 --- Addressing Phase --- p.34 / Chapter 4.4.2 --- Connection Phase --- p.36 / Chapter 4.5 --- Software Implementation --- p.38 / Chapter Chapter 5 --- Simulation Results --- p.39 / Chapter 5.1 --- Simulation Model --- p.39 / Chapter 5.2 --- Voice Source Model --- p.41 / Chapter 5.3 --- Simulation Results --- p.43 / Chapter 5.3.1 --- Network Utilization and Delay Performance --- p.43 / Chapter 5.3.2 --- Number of Supported Connections --- p.45 / Chapter Chapter 6 --- Conclusion and Future Work --- p.49 / Bibliography --- p.52

by Chan Ho Chow. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (leaves 65-67). / Abstracts in English and Chinese. / Chapter Chapter 1 --- Introduction --- p.1 / Chapter Chapter 2 --- Background --- p.5 / Chapter 2.1. --- Packet Loss in the Internet --- p.5 / Chapter 2.2. --- Shared Internet --- p.7 / Chapter 2.3. --- Video Streaming --- p.10 / Chapter 2.4. --- Real-time video transmission criteria --- p.11 / Chapter 2.5. --- Existing Video Streaming Protocol --- p.13 / Chapter Chapter 3 --- Transmission Control Protocol (TCP) --- p.16 / Chapter Chapter 4 --- Variable-rate Streaming TCP (VarS-TCP) --- p.22 / Chapter 4.1. --- General Idea --- p.22 / Chapter 4.2. --- Assumptions --- p.25 / Chapter 4.3. --- VarS-TCP Algorithm --- p.26 / Chapter 4.3.1. --- Connection Initialization --- p.26 / Chapter 4.3.2. --- Normal Data Transfer --- p.27 / Chapter 4.4. --- Skipping packets in TCP --- p.32 / Chapter 4.4.1. --- Types of skipped packet --- p.32 / Chapter 4.4.2. --- Acknowledging skipped packets --- p.34 / Chapter 4.4.3. --- Maintaining Normal Data Flow --- p.35 / Chapter 4.4.4. --- Congestion Control --- p.37 / Chapter 4.4.5. --- Packets skipped by receiver --- p.41 / Chapter 4.5. --- Rebuffering --- p.44 / Chapter Chapter 5 --- Simulation Result --- p.45 / Chapter 5.1. --- Accumulating Data --- p.46 / Chapter 5.2. --- Delay Constraints --- p.48 / Chapter 5.3. --- Adapting network situation --- p.50 / Chapter 5.4. --- Sharing bandwidth with TCP --- p.52 / Chapter 5.5. --- Random Traffic --- p.58 / Chapter 5.6. --- Effect of packet skip threshold --- p.59 / Chapter 5.7. --- Effect of round-trip-time --- p.61 / Chapter Chapter 6 --- Conclusion and Future Works --- p.63 / Bibliography --- p.65

Hua Cunqing. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (leaves 53-56). / Abstracts in English and Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Congestion Control in the IP Network --- p.1 / Chapter 1.2 --- Quality of Service in the IP network --- p.2 / Chapter 1.3 --- Structure of Thesis --- p.3 / Chapter 2 --- Background --- p.4 / Chapter 2.1 --- TCP and Congestion Control --- p.4 / Chapter 2.1.1 --- Slow Start --- p.4 / Chapter 2.1.2 --- Congestion Avoidance --- p.5 / Chapter 2.1.3 --- "Fast Retransmit, Fast Recovery and Timeout" --- p.5 / Chapter 2.2 --- Active Queue Management --- p.7 / Chapter 2.3 --- Integrated Services and Differentiated Services --- p.8 / Chapter 3 --- The Fairness of TCP Vegas in Networks with Multiple Congested Gate- ways --- p.10 / Chapter 3.1 --- Introduction --- p.10 / Chapter 3.2 --- TCP Vegas and related works --- p.11 / Chapter 3.3 --- Analysis --- p.13 / Chapter 3.4 --- Simulation Results --- p.15 / Chapter 3.4.1 --- Throughput for different number of active cross connections --- p.16 / Chapter 3.4.2 --- Throughput for different number of flows in each connection --- p.17 / Chapter 3.4.3 --- Multiple congestion vs Single congestion --- p.17 / Chapter 3.5 --- Summary --- p.19 / Chapter 4 --- The Joint Congestion Control for TCP/IP Networks --- p.21 / Chapter 4.1 --- Background --- p.21 / Chapter 4.2 --- The Joint Congestion Control --- p.23 / Chapter 4.2.1 --- Path Load Reduction Factor --- p.23 / Chapter 4.2.2 --- The Congestion Control Algorithm --- p.24 / Chapter 4.2.3 --- Probing Interval --- p.26 / Chapter 4.2.4 --- Parameter Setting --- p.26 / Chapter 4.2.5 --- Encoding of R --- p.27 / Chapter 4.3 --- Simulation Results --- p.28 / Chapter 4.3.1 --- Congestion Window Behavior --- p.28 / Chapter 4.3.2 --- Throughput Stability --- p.31 / Chapter 4.3.3 --- Packet Loss Ratio --- p.31 / Chapter 4.3.4 --- Fairness Index --- p.32 / Chapter 4.3.5 --- Fairness in Multiple-hop Network --- p.32 / Chapter 4.3.6 --- Parameter Sensitivity --- p.33 / Chapter 4.3.7 --- Interaction between JCC and Reno flows --- p.35 / Chapter 4.4 --- Summary --- p.35 / Chapter 5 --- S-WTP : Shifted Waiting Time Priority Scheduling for Delay Differ- entiated Services --- p.37 / Chapter 5.1 --- Introduction --- p.37 / Chapter 5.2 --- Scheduling Algorithms for Delay Differentiated Services --- p.38 / Chapter 5.3 --- Shifted Waiting Time Priority Scheduling --- p.41 / Chapter 5.3.1 --- Local Update --- p.42 / Chapter 5.3.2 --- Global Update --- p.42 / Chapter 5.3.3 --- Computational overhead --- p.42 / Chapter 5.4 --- Simulation Results --- p.43 / Chapter 5.4.1 --- Microscopic View of Individual Packet Delay of S-WTP and WTP --- p.43 / Chapter 5.4.2 --- Delay Ratios in Different Timescales --- p.44 / Chapter 5.4.3 --- Effects of aggregate traffic and class load distribution on delay ratio --- p.44 / Chapter 5.4.4 --- Delay Ratios with More Classes --- p.48 / Chapter 5.5 --- Summary --- p.48 / Chapter 6 --- Conclusions --- p.50 / Chapter 6.1 --- Congestion Control --- p.50 / Chapter 6.2 --- Quality of Service Provision --- p.51 / Chapter 6.3 --- Final Remarks --- p.51

Ante el inminente agotamiento de las direcciones IPv4, se requiere que las organizaciones inicien la transición de sus redes y contenidos hacia el protocolo IPv6, por lo que la presente tesis tiene como finalidad proponer un modelo de referencia para iniciar el proceso de transición hacia el protocolo IPv6 en las Instituciones Públicas del Gobierno de Perú, debido a que a la fecha de publicado el presente trabajo, a nivel de gobierno, las instituciones públicas que están relacionadas directamente con el desarrollo de las telecomunicaciones y de las tecnologías de información en el Perú, no han considerado la elaboración de una metodología y/o documentos técnicos que permita a las instituciones públicas prepararse para iniciar el despliegue del protocolo IPv6 en sus redes y contenidos. El contar con un modelo de referencia y los documentos técnicos necesarios permite dinamizar la adopción del nuevo protocolo, esto se evidencia en la revisión de las acciones que vienen realizando diversos países como: Argentina, Brasil, Colombia, Chile, Estados Unidos y España, quienes a parte de definir una estrategia nacional de transición hacia IPv6, han elaborado modelos de referencia y documentos técnicos de apoyo específicos para que sus instituciones públicas puedan iniciar la transición hacia el nuevo protocolo IPv6. En ese sentido, el aporte principal del presente trabajo es presentar un modelo de referencia y documentos técnicos que sirvan de apoyo para iniciar la transición hacia el protocolo IPv6 en las instituciones públicas a nivel del Gobierno Peruano. / Tesis

El objetivo de la presente tesis es demostrar las ventajas y beneficios de la implementación de la Red Next Generation Network (NGN) en Lima-Metropolitana. La Red NGN está basada en una serie de plataformas y protocolos, los cuales deben trabajar de una manera ordenada y jerárquica para el buen funcionamiento de la red y seguir ofreciendo los servicios actuales así como nuevos servicios de redes avanzadas, todas ellas basadas en plataformas de red IP. Se realizó un estudio mercado de los servicios ofrecidos actualmente por los operadores, en donde se puede apreciar la cantidad de clientes por servicio y la penetración de estos servicios a lo largo de los años 2007-2011. Seguidamente se presentan además los servicios que se podrían ofrecer con el desarrollo de esta tecnología, estos servicios tales como IPTV y teleconferencias, que son ofrecidos en otros países, como México y España, por ejemplo. La Ingeniería del proyecto propone la ubicación de puntos de presencia (PoP) en áreas estratégicas, de tal manera que se atienda las necesidades de los usuarios. Se propone además el tipo de topología a usar así como los elementos de red necesarios para su puesta en servicio. Finalmente se realiza el análisis financiero de los servicios ofrecidos en el sector de telecomunicaciones del mercado de Lima – Metropolitana, basando el estudio en valores obtenidos de los indicadores estadísticos del Regulador Osiptel, permitiendo demostrar la rentabilidad de la implementación de la red propuesta en la presente tesis. / Tesis

El presente proyecto tiene por título: Diseño e Implementación de un Equipo Electrónico para la Tarifación de Llamadas Telefónicas en Locutorios de Voz IP, donde un locutorio se entiende como un conjunto de líneas telefónicas, Voz IP hace referencia a la tecnología que transmite la voz sobre una red IP y la tarifación es el proceso por el cual asignamos un valor monetario (costo) a una llamada telefónica. / Tesis

Submitted by Sara Ribeiro (sara.ribeiro@ucb.br) on 2017-09-06T17:33:41Z No. of bitstreams: 1 AnneKarenSantosTrindadeDissertacao2017.pdf: 2108662 bytes, checksum: 9f0699c1cd7da128bfec9a40cb258496 (MD5) / Approved for entry into archive by Sara Ribeiro (sara.ribeiro@ucb.br) on 2017-09-06T17:33:58Z (GMT) No. of bitstreams: 1 AnneKarenSantosTrindadeDissertacao2017.pdf: 2108662 bytes, checksum: 9f0699c1cd7da128bfec9a40cb258496 (MD5) / Made available in DSpace on 2017-09-06T17:33:58Z (GMT). No. of bitstreams: 1 AnneKarenSantosTrindadeDissertacao2017.pdf: 2108662 bytes, checksum: 9f0699c1cd7da128bfec9a40cb258496 (MD5) Previous issue date: 2017-03-10 / The bees give a great contribution in maintaining genetic variability of plants from the Cerrado. Tabebuia aurea is a species of the family Bignoniaceae typical of the Cerrado, having large sized bees as its main pollinator. The dispersal of pollen by bees has been well-studied and genomic techniques can facilitate this type of study. This work aimed to develop strategies for the extraction and amplification of DNA from pollen grains of Tabebuia aurea. For this purpose, we collected pollen grains of bee legs caught in Parque Nacional de Bras??lia ??? DF, which subsequently underwent two different techniques of WGA (Whole Genome Amplification). The WGA amplification products were used to amplify 15 microsatellite loci, which were used for characterization of the genetic diversity of the pollen grains. The amplified fragments were separated by capillary electrophoresis in an automatic sequencer and the results were analyzed using the program Geneious. Twenty-two trees were evaluated and the characterization of the allelic diversity was held for groups of pollen grains, each containing 20 grains, from 31 bees; single pollen grains were also evaluated. The WGA technique OmnPlex was the one that produced the largest amount of genomic DNA allowing the amplification of different microsatellite loci. Using the DNA obtained by this technique as a template, all groups of pollen grains showed high rate of polymorphism with 10 or more alleles per locus. In addition, it was observed that most of the bees carry pollen from only one donor, indicating that bees remain for a long time in the same tree. / As abelhas d??o uma grande contribui????o na manuten????o da variabilidade gen??tica de plantas do Cerrado. Tabebuia aurea ?? uma esp??cie da fam??lia Bignoniaceae, t??pica do Cerrado, tendo as abelhas de grande porte como seu principal polinizador. A dispers??o de gr??os de p??len por abelhas vem sendo bastante estudada e as t??cnicas da gen??mica podem facilitar esse tipo de estudo. Este trabalho teve como objetivo desenvolver estrat??gias para a extra????o e amplifica????o de DNA de gr??os de p??len de Tabebuia aurea. Para isto, foram coletados gr??os de p??len das patas de abelhas capturadas no Parque Nacional de Bras??lia ??? DF, que posteriormente foram submetidos a duas t??cnicas diferentes de WGA (Whole Genome Amplification). Os produtos da amplifica????o WGA foram utilizados para amplificar 15 locos microssat??lites, os quais foram usados para caracteriza????o da diversidade al??lica dos gr??os de p??len. Os fragmentos amplificados foram separados por eletroforese capilar em um sequenciador autom??tico e os resultados foram analisados utilizando o programa Geneious. Foram avaliadas 22 ??rvores e a caracteriza????o da diversidade al??lica foi realizada para conjuntos de gr??os de p??len, cada um contendo 20 gr??os, provenientes de 31 abelhas; foram avaliados tamb??m gr??os de p??len ??nicos. A t??cnica WGA OmnPlex foi aquela que produziu a maior quantidade de DNA gen??mico permitindo a amplifica????o espec??fica dos diferentes locos microssat??lites. Utilizando o DNA obtido por essa t??cnica como molde, todos os grupos de gr??os de p??len apresentaram alta taxa de polimorfismo com 10 ou mais alelos por loco, al??m disso, observou-se que a maioria das abelhas carregavam gr??os de p??len de apenas um doador, indicando que as abelhas permanecem por muito tempo em uma mesma ??rvore.

Findings of this research work provide clear understanding of why organizationaltechnology(Network technology) adoption decision makers decide to recommend or notrecommend an Internet Protocol migration(adoption of the latest protocol), or a migrationfrom Ipv4 to IPv6/ or adoption of IPv6, to their organizations. A meticulous review ofliterature on the practice of various organizations technology adoption process served as abase for developing relevant research questions and corresponding hypothesis. The researchhypothesis was developed to examine organization‟s technology (Network technology)adoption decision maker‟s perception of IPv6: quality of service, auto configurationcapability, security, mobility, address abundance and cost effectiveness and its effect on theirdecision.The study result indicated that network expert‟s decision to recommend a new networktechnology adoption, specifically, internet protocol migration from IPv4 to IPv6 is highlyinfluenced by their perception of the factors listed in the previous paragraph, thereforenetwork expert‟s perception of the aforementioned factors are instrumental for their decisionof recommending whether to encourage the internet protocol migration. It is also implied thatmanagers at top level can make a technology adoption or migration decision based on therecommendation from the experts already knowing that their decision is highly influenced bytheir perception of capabilities and functionality of the new IP (IPv6). In addition to theapparent contribution of this study to organizations that fall in to the category of organization,where this study was conducted, the result of this study also helps different organizationsengaged in other kinds of business activity, such as: network infrastructure manufacturersand application developers by providing essential information regarding which functionalitiesand capabilities are playing a major role for organization‟s choice for a certain networkinfrastructure. / Program: Masterutbildning i Informatik