Jia, Lu. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (p. 76-80). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgement --- p.iv / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Background Study --- p.7 / Chapter 3 --- Analysis of P2P Tracker Designs --- p.11 / Chapter 1 --- Tracker design in P2P systems --- p.11 / Chapter 1.1 --- A taxonomy of tracker designs --- p.11 / Chapter 1.2 --- Design considerations --- p.14 / Chapter 2 --- A reliability model for DHT-based tracker design --- p.15 / Chapter 2.1 --- DHT basics --- p.15 / Chapter 2.2 --- Model preliminaries and assumptions --- p.16 / Chapter 2.3 --- Model description --- p.18 / Chapter 3 --- Reliability analysis --- p.25 / Chapter 3.1 --- Related parameters --- p.25 / Chapter 3.2 --- Simulation setup --- p.27 / Chapter 3.3 --- Results --- p.30 / Chapter 3.4 --- Observations from modeling work --- p.35 / Chapter 3.5 --- Methods of DHT stabilization --- p.37 / Chapter 4 --- A Black-Box Study of Xunlei --- p.44 / Chapter 1 --- An Overview of Xunlei and its key components --- p.44 / Chapter 1.1 --- An overview --- p.44 / Chapter 1.2 --- Key components --- p.46 / Chapter 2 --- Participating into other swarms: Xunlei´ةs multi-protocol downloading strategy --- p.47 / Chapter 2.1 --- BitTorrent and eMule basics --- p.47 / Chapter 2.2 --- BitTorrent and eMule in Xunlei --- p.48 / Chapter 2.3 --- Multi-protocol downloading --- p.52 / Chapter 3 --- Xunlei servers --- p.54 / Chapter 4 --- Understanding Xunlei!s private protocol --- p.56 / Chapter 4.1 --- Exchanging peer lists --- p.56 / Chapter 4.2 --- Exchanging file data --- p.58 / Chapter 4.3 --- Error control and congestion control --- p.62 / Chapter 5 --- Further discussions --- p.65 / Chapter 5.1 --- Proximity of content --- p.65 / Chapter 5.2 --- Active swarm peers --- p.66 / Chapter 5.3 --- UDP-based data transmission --- p.69 / Chapter 5 --- Conclusion --- p.74 / Bibliography --- p.76

Fu, Zhengjia. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (p. 64-70 ). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgement --- p.iv / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Design for group network communication --- p.6 / Chapter 2.1 --- Performance metrics of network Voice Conference: GMOS --- p.7 / Chapter 2.2 --- Conference Leader Selection strategies --- p.11 / Chapter 2.3 --- Experiment Description --- p.14 / Chapter 2.4 --- Data analysis and results --- p.16 / Chapter 2.5 --- Applications of Proposals to Voice Conference --- p.25 / Chapter 3 --- P2P Application Identification --- p.27 / Chapter 3.1 --- Periodic Group Communication Patterns --- p.28 / Chapter 3.1.1 --- Terminology for Behavioral Patterns --- p.29 / Chapter 3.1.2 --- Pattern 1: Gossip of Buffer Maps --- p.30 / Chapter 3.1.3 --- Pattern 2: Content flow control --- p.31 / Chapter 3.1.4 --- Pattern 3: Synchronized Link Activation and Deactivation --- p.32 / Chapter 3.2 --- Identification Based on behavioral signatures --- p.33 / Chapter 3.2.1 --- Algorithm Overview --- p.34 / Chapter 3.2.2 --- Sequence Generation (SG1): Time Series for the Gossip Pattern --- p.36 / Chapter 3.2.3 --- Transform Time-domain Sequence to Frequency-domain Sequence --- p.36 / Chapter 3.2.4 --- Sequence Generation (SG2): Time Series for Content Flow Control Pattern --- p.40 / Chapter 3.2.5 --- Sequence Generation (SG3): Time Series for Synchronized Start and Finish of Flows --- p.41 / Chapter 3.2.6 --- Analyzer step --- p.47 / Chapter 3.3 --- Behavioral signatures of popular P2P applications --- p.47 / Chapter 3.4 --- Experiment Results --- p.49 / Chapter 3.5 --- Discussion --- p.52 / Chapter 4 --- Related Work --- p.58 / Chapter 5 --- Conclusion --- p.62 / Bibliography --- p.64

Li, Qiuhui. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (leaves 46-47). / Abstract also in Chinese. / Abstract --- p.i / Acknowledgement --- p.ii / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- An overview of the BitTorrent protocol --- p.3 / Chapter 2 --- Problem Formulation --- p.7 / Chapter 2.1 --- Type-based Peer Selection Algorithm --- p.7 / Chapter 2.2 --- Clustering Index --- p.9 / Chapter 3 --- Model Formulation --- p.11 / Chapter 3.1 --- Markovian Model --- p.12 / Chapter 3.2 --- Transition Matrix --- p.14 / Chapter 3.2.1 --- Search Process --- p.16 / Chapter 3.2.2 --- Match Process --- p.18 / Chapter 3.2.3 --- Cut Process --- p.19 / Chapter 3.3 --- Open System Model --- p.21 / Chapter 4 --- Numerical Results and Observations --- p.24 / Chapter 4.1 --- Clustering Index --- p.24 / Chapter 4.2 --- Upload Utilization --- p.26 / Chapter 4.3 --- Download Rate --- p.28 / Chapter 4.4 --- Open System --- p.30 / Chapter 5 --- Performance Evaluation --- p.32 / Chapter 5.1 --- Model Verification --- p.34 / Chapter 5.2 --- Control the Clustering Index --- p.36 / Chapter 6 --- Related Works --- p.40 / Chapter 7 --- Conclusions --- p.44 / Bibliography --- p.46

Zhou, Yipeng. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 64-66). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgement --- p.iv / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Background --- p.1 / Chapter 1.2 --- Contribution --- p.2 / Chapter 1.3 --- Organization --- p.4 / Chapter 2 --- Related Work --- p.5 / Chapter 2.1 --- Work of Streaming --- p.5 / Chapter 2.2 --- Work of P2P VoD --- p.6 / Chapter 3 --- Basic Model of Synchronized Case --- p.8 / Chapter 4 --- Model of Chunk Selection Strategies --- p.13 / Chapter 4.1 --- Chunk Selection Strategies --- p.13 / Chapter 4.1.1 --- Greedy Strategy --- p.14 / Chapter 4.1.2 --- Rarest First Strategy --- p.15 / Chapter 4.1.3 --- "Buffer Size, Peer Population and Continuity" --- p.16 / Chapter 4.1.4 --- Mixed Strategy --- p.17 / Chapter 4.2 --- Some Conclusion and Extension --- p.19 / Chapter 4.3 --- Metrics --- p.20 / Chapter 4.3.1 --- Continuity --- p.20 / Chapter 4.3.2 --- Start-up Latency --- p.20 / Chapter 5 --- Experiment and Application --- p.22 / Chapter 5.1 --- Numerical Examples and Analysis --- p.22 / Chapter 5.2 --- Sensitivity study --- p.30 / Chapter 5.2.1 --- Discrete Model with Factor --- p.30 / Chapter 5.2.2 --- Validate Discrete Model with Factor --- p.31 / Chapter 5.2.3 --- Server Use Pull Strategy --- p.31 / Chapter 5.2.4 --- Vary Subset Size Touched by Server --- p.32 / Chapter 5.3 --- Application to Real-world Protocols --- p.32 / Chapter 6 --- Model of Unsynchronized Case --- p.34 / Chapter 6.1 --- The model for unsynchronized playback --- p.34 / Chapter 6.1.1 --- Overlap maximization problem --- p.37 / Chapter 6.1.2 --- Properties of the synchronized cluster --- p.38 / Chapter 6.2 --- Analysis of playback continuity --- p.40 / Chapter 6.2.1 --- Peers with different buffer sizes --- p.41 / Chapter 6.2.2 --- Analysis of two clusters with a lag --- p.44 / Chapter 7 --- Performance Evaluation of Unsynchronized System --- p.48 / Chapter 7.1 --- Performance Evaluation --- p.48 / Chapter 8 --- conclusion --- p.54 / Chapter 8.1 --- Conclusion --- p.54 / Chapter A --- Equation Derivation --- p.56 / Bibliography --- p.64

Ye, Chong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 61-63). / Abstracts in English and Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Classification of P2P systems --- p.1 / Chapter 1.2 --- Replication in P2P systems --- p.3 / Chapter 1.3 --- Related work --- p.7 / Chapter 1.4 --- Organization --- p.10 / Chapter 1.5 --- Publications derived from this work --- p.11 / Chapter 2 --- P2P Replication System --- p.12 / Chapter 2.1 --- Peers --- p.13 / Chapter 2.2 --- Erasure code replication --- p.13 / Chapter 2.3 --- Estimation of file availability --- p.14 / Chapter 2.4 --- Problem formulation --- p.15 / Chapter 2.5 --- Performance metrics --- p.17 / Chapter 3 --- Decentralized Decisions --- p.19 / Chapter 3.1 --- Writable peer set --- p.20 / Chapter 3.2 --- Stretch factor estimation --- p.21 / Chapter 3.3 --- Locking phase --- p.22 / Chapter 4 --- Equal Weight Replication --- p.23 / Chapter 4.1 --- The decentralized replication algorithms --- p.23 / Chapter 4.1.1 --- Random algorithm --- p.23 / Chapter 4.1.2 --- Group partition algorithm --- p.25 / Chapter 4.1.3 --- High Available First (HAF) algorithm --- p.27 / Chapter 4.2 --- Evaluation of algorithms --- p.29 / Chapter 4.2.1 --- Simulation setup --- p.29 / Chapter 4.2.2 --- Simulation results --- p.31 / Chapter 4.3 --- Summary --- p.40 / Chapter 4.4 --- Clarification of individual contributions --- p.41 / Chapter 5 --- Replication with Preferences --- p.43 / Chapter 5.1 --- Problem re-defined --- p.44 / Chapter 5.2 --- The Bi-weight model --- p.46 / Chapter 5.3 --- The statistical rounding policy --- p.48 / Chapter 5.4 --- The distributed replication algorithm --- p.49 / Chapter 5.5 --- Evaluation of the algorithm --- p.51 / Chapter 5.5.1 --- Simulation setup --- p.51 / Chapter 5.5.2 --- Simulation results --- p.52 / Chapter 5.6 --- Discussion --- p.56 / Chapter 5.7 --- Summary --- p.57 / Chapter 6 --- Future work --- p.58 / Chapter 7 --- Conclusion --- p.59 / Bibliography --- p.61

Cette thèse se base sur une vision originale des systèmes de Recherche d'Information en pair-à-pair (RI-P2P) ; pour proposer un ensemble d'outils pour mieux les évaluer et mieux les concevoir.Synthétiquement, la problématique d'évaluation consiste à comprendre quel système fonctionne bien dans quelles conditions ; comment les différents composants/aspects d'un système contribuent à ses performances ; comment des modifications du système peuvent faire évoluer ses performances. D'un point de vue conception, on voudrait savoir choisir une approche P2P en fonction du contexte de l'application à implémenter (jeu de données, propriétés du réseau...) ; comprendre comment mixer des systèmes ; mieux maîtriser l'impact d'une modification de l'implémentation sur le comportement et les performances d'un système.Nous pensons que ces deux problématiques d'évaluation et de conception sont fortement liées. Un même fondement est nécessaire pour progresser dans ces deux sens : mieux comprendre l'architecture des systèmes RI-P2P. À la base de notre réflexion, nous considérons qu'un système RI-P2P est l'implémentation en P2P d'un modèle RI, idée qui s'oppose au modèle traditionnel en deux couches. Nous nous appuyons sur cette idée pour donner un ensemble de définitions qui permettent de mieux appréhender les différents composants RI et composants P2P d'un même système et la façon dont ils s'organisent. Nous montrons ensuite comment on peut utiliser cette vision originale du domaine pour spécifier la démarche d'évaluation d'un système P2P et pour aider à la conception de nouveaux systèmes. / This PhD thesis develops an original vision of Peer-to-Peer Information Retrieval Systems. Based on this vision, we ropose a set of tools for a better evaluation and conception of P2P-IR systems.Synthetically, on the one hand, evaluating means understanding which system behaves well in which context ; how different components/aspects of a single system contribute to its performance ; how modifications of the system can make its performance evolve. On the other hand, considering design of P2P-IR systems, we would like to be able to choose a P2P approach based on what is known about the context the application will execute in (data set, network properties...) ; understand how to mix P2P systems ; better control the impact of a modification of the implementation of a system on its behavior an performance.We believe those concerns of evaluation and design are strongly related. There is a common need to improve on both directions : better understand the architecture of P2P-IR systems. On the basis of our reflexion, we consider a P2P-IR system is the implementation in P2P of an IR system, which contrasts with the traditional two-layered vision. We use this idea to give a set of definitions that help better understand the different RI and P2P components of a single system and their relationships. We then show how this vision can be used to help design new systems.

Research suggests that the transition to adolescence and secondary school can be challenging and potentially disruptive to adolescent functioning. Large-scale studies on the effectiveness of peer support programs are currently lacking and those that have been conducted are compromised by methodological problems. The primary purpose of this research was to 1/ identify psychometrically sound measurement instruments for use with secondary school students; 2/ test the impact of the peer support program on espoused program outcomes and other aspects of students' psychological well-being and adjustment to the secondary schooling context; 3/ extend previous research by examining the effects of serving as a peer support leader on leadership ability and other psychological constructs; and 4/ identify students' perceptions of the impact, strengths and weaknesses of the program in order to further strengthen peer support intervention design. The findings have important implications for the provision of programs and techniques employed to address students' problems following the transition to adolescence and secondary school. In particular, they suggest that peer support programs have the potential to make a significant contribution to schools' efforts to orchestrate positive outcomes, not only for early adolescents, but also for older students who implement the program / Doctor of Philosophy (PhD)

Research suggests that the transition to adolescence and secondary school can be challenging and potentially disruptive to adolescent functioning. Large-scale studies on the effectiveness of peer support programs are currently lacking and those that have been conducted are compromised by methodological problems. The primary purpose of this research was to 1/ identify psychometrically sound measurement instruments for use with secondary school students; 2/ test the impact of the peer support program on espoused program outcomes and other aspects of students' psychological well-being and adjustment to the secondary schooling context; 3/ extend previous research by examining the effects of serving as a peer support leader on leadership ability and other psychological constructs; and 4/ identify students' perceptions of the impact, strengths and weaknesses of the program in order to further strengthen peer support intervention design. The findings have important implications for the provision of programs and techniques employed to address students' problems following the transition to adolescence and secondary school. In particular, they suggest that peer support programs have the potential to make a significant contribution to schools' efforts to orchestrate positive outcomes, not only for early adolescents, but also for older students who implement the program / Doctor of Philosophy (PhD)

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2007. / Includes bibliographical references (leaves 89-94). Also available in electronic version.

Thesis (M.Ed.)--University of Hong Kong, 1992. / Includes bibliographical references (leaf 52-53). Also available in print.