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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A hybrid P2P pre-release distribution framework for flash crowd avoidance in P2P video on demand streaming

Chiu, Stanley Kai Him 11 1900 (has links)
In recent years, the high maintenance cost of centralized video on demand sys tems has led to the development of peer to peer video on demand systems. These peer to peer systems help to remove the cost and bandwidth limitations of a centralized group of servers. In a peer to peer scenario, the publisher and a small set of peers who were published to must handle all video requests. If many peers request a video after it is released, the small set of peers with the video cached may not have enough bandwidth to satisfy all requests. This situation is known as a flash crowd. We propose a hybrid peer to peer framework that allows publishers to publish videos before release time. For marketing purposes, it is common for videos that are ready for distribution to be kept from being released until a preset release time. By distributing a video before the release time, more peers will have the video at release time, thus allowing more requests to be handled. A hybrid peer to peer encryption management system is used to prevent users from viewing videos before release time. In order to determine who to distribute a video to before users are allowed to view the video, we design a hybrid peer to peer subscription system. In this system, users may specify interest in sets of videos and are notified of new videos matching the interest so that retrieval may start. Finally, we modify an existing peer to peer video on demand framework to better handle concurrent streaming and downloading. Our experiments show that this framework can greatly increase a peer to peer streaming system’s ability to handle flash crowd situations.
2

A hybrid P2P pre-release distribution framework for flash crowd avoidance in P2P video on demand streaming

Chiu, Stanley Kai Him 11 1900 (has links)
In recent years, the high maintenance cost of centralized video on demand sys tems has led to the development of peer to peer video on demand systems. These peer to peer systems help to remove the cost and bandwidth limitations of a centralized group of servers. In a peer to peer scenario, the publisher and a small set of peers who were published to must handle all video requests. If many peers request a video after it is released, the small set of peers with the video cached may not have enough bandwidth to satisfy all requests. This situation is known as a flash crowd. We propose a hybrid peer to peer framework that allows publishers to publish videos before release time. For marketing purposes, it is common for videos that are ready for distribution to be kept from being released until a preset release time. By distributing a video before the release time, more peers will have the video at release time, thus allowing more requests to be handled. A hybrid peer to peer encryption management system is used to prevent users from viewing videos before release time. In order to determine who to distribute a video to before users are allowed to view the video, we design a hybrid peer to peer subscription system. In this system, users may specify interest in sets of videos and are notified of new videos matching the interest so that retrieval may start. Finally, we modify an existing peer to peer video on demand framework to better handle concurrent streaming and downloading. Our experiments show that this framework can greatly increase a peer to peer streaming system’s ability to handle flash crowd situations.
3

Peer-to-Peer Distributed Database System

Zhang, Naishan January 2004 (has links)
This thesis implements a Peer-to-Peer (P2P) distributed database system (PDBS). In a PDBS, peers in a peer group have their own local databases, and information in these local databases can be shared among peers through user queries. As a fully decentralized P2P distributed database information sharing application, each node of a PDBS has both server and client functions. The peer server component includes the query service and schema service, and peer client component includes user interface and client controller. Both peer client component and peer server component access its local database component including user database and administration database. A PDBS supports peer users to create and send queries and update queries to other peers, and integrates the distributed query results. PDBS also provides facilities to establish virtual communication groups, as well as allowing peers to join and leave groups at any time. Peers are able to find other peers and query databases of the other peers. PDBS is implemented with the JXTA platform for Peer-to-Peer computing. PDBS is a complete application of JXTA. The query service and schema service of PDBS is implemented by the underling services of JXTA. PDBS schema service is used to create and search database schemas, and PDBS query service is to handle database queries.
4

A hybrid P2P pre-release distribution framework for flash crowd avoidance in P2P video on demand streaming

Chiu, Stanley Kai Him 11 1900 (has links)
In recent years, the high maintenance cost of centralized video on demand sys tems has led to the development of peer to peer video on demand systems. These peer to peer systems help to remove the cost and bandwidth limitations of a centralized group of servers. In a peer to peer scenario, the publisher and a small set of peers who were published to must handle all video requests. If many peers request a video after it is released, the small set of peers with the video cached may not have enough bandwidth to satisfy all requests. This situation is known as a flash crowd. We propose a hybrid peer to peer framework that allows publishers to publish videos before release time. For marketing purposes, it is common for videos that are ready for distribution to be kept from being released until a preset release time. By distributing a video before the release time, more peers will have the video at release time, thus allowing more requests to be handled. A hybrid peer to peer encryption management system is used to prevent users from viewing videos before release time. In order to determine who to distribute a video to before users are allowed to view the video, we design a hybrid peer to peer subscription system. In this system, users may specify interest in sets of videos and are notified of new videos matching the interest so that retrieval may start. Finally, we modify an existing peer to peer video on demand framework to better handle concurrent streaming and downloading. Our experiments show that this framework can greatly increase a peer to peer streaming system’s ability to handle flash crowd situations. / Science, Faculty of / Computer Science, Department of / Graduate
5

Diverzifikace portfolia u P2P půjček / Portfolio diversification on P2P loan markets

Polák, Petr January 2017 (has links)
This thesis presents ways how investors can construct optimal portfolios on on-line peer-to-peer lending platforms. Thesis uses standard portfolio theory and unique dataset from Lending Club platform of over 886 thousand loans issued since 2008 till the end of 2015. Firstly, this thesis shows that there is a non- zero covariance between loans from different credit grades and it is necessary to include it in portfolio management optimization. Secondly, the thesis with the help of a logistic regression identifies loan default determinants. Using the default predictions, the portfolio performance can be improved significantly. Thirdly, the thesis simulates diversification benefits stemming from investing into multiple loans. Powered by TCPDF (www.tcpdf.org)
6

Measurement and analysis of BitTorrent

Sadafal, Videsh 10 October 2008 (has links)
BitTorrent is assumed and predicted to be the world's largest Peer to Peer (P2P) network. Previous studies of the protocol mainly focus on its file sharing algorithm, and many relevant aspects of the protocol remain untouched. In the thesis, we conduct a number of experiments to explore those untouched aspects. We implement a BitTorrent crawler to collect data from trackers and peers, and statistically analyze it to understand the characteristics and behaviors of the BitTorrent protocol better. We find that the expected lifetime of a peer in the BitTorrent is 56.6 minutes and the activity is diurnal. Peers show strong preference towards a limited number of torrents, and 10% of torrents are responsible for 67% of traffic. The US contributes maximum number of peers to the BitTorrent and µTorrent emerges as the favorite BitTorrent client. We measure the strength of Distributed Denial of Service (DDoS) attack using BitTorrent network and conclude that it is transient and weak. Finally we address and discuss the content locatability problem in BitTorrent and propose two solutions.
7

Design and Implementation of a Proxy Server to Improve the Performance of SIP Signaling Transmission and Fault Tolerance

Yeh, Po-ting 16 July 2009 (has links)
In the 21st century's today, because of the computer and the telecommunication are combined with each other, VOIP (Voice over Internet Protocol) substitute for PSTN(Public Switched Telephone Network) stage by stage according to its cost and the quality of voice. VOIP digitizes analogic voice by software and hardware, and uses Packet Switching to transmit the packets in the IP network, its standard protocol are H.323, SIP, etc. H.323 is more complex and has more sub-protocol such that it is restricted by technicality. To compare with H.323, SIP is free. It can achieve the goal communication with PSTN through Gateway, and constructs a simple structure of VOIP. SIP has become the important protocol of NGN (Next Generation Networks) and 3G mutimedia systems. The structure of Client-Server of SIP is simple, but as long as the users increase, the Server may cause some trouble because of the great deal of information, and the VOIP network which depends on the Server will stop its service. For this reason, we will improve the Client-Server structure in the paper, we wish that clients could communication with the others without the service of SIP Server to reduce the load, and improve the perfomance of SIP signaling.
8

Network coding based P2P content distribution system in VANET

Liou, Jing-Tsung 29 July 2009 (has links)
As the rapid evolution of the technology and the network communication, people can share the multimedia content more easily through the Internet. And devices for accessing the Internet include not only the desktop computers but also cell phones, PDAs, and computers on the vehicles. Vehicular ad-hoc networks, which allow mobile users to access the Internet with the computers on cars is one of the most promising technology in the near future. Through VANET, vehicles can not only share the traffic information to avoid accidents, but also exchange the multimedia content through the peer to peer sharing technology. In this thesis we propose using the network coding technology to encode/decode the file blocks in VANET, clustering the vehicles according to their mobility, and combining the ROMSGP and modifying the priority method of the VANETCODE scheme in order to enhance the overall performance of VANETs.
9

Analýza trhu P2P půjček / Analysis of p2p loans market

Štegner, Jaroslav January 2015 (has links)
The thesis is focused on analysis of market with p2p loans, which are provided by online platform as an intermediary between investors and borrowers. The work contains theoretical and legislative resources for establishment, development and everyday operating of a platform. Further the concept of p2p lending is developed as another asset class available to investors.The thesis contains analysis of unsecured credit market in Czech republic and it trying to find the most potential part of this market for p2p loans. It also includes an overview of the most important domestic and foreign platforms and investment recommendations for investors.
10

A hybrid peer-to-peer framework for supply chain visibility

Li, Zhijie January 2017 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / Current supply chain information systems are transaction-based and suffer from lack of real-time transparency. Furthermore, they are often centralized and therefore cannot adequately scale to include a large number of small and medium size companies. This thesis presents a hybrid peer-to-peer supply chain physical distribution framework (HP3D) that addresses these increasingly critical gaps in a global market. HP3D leverages the advantages of hybrid networks through flexible peers and a light-weight index server in order to share supply chain physical distribution information in pseudo real-time among stakeholders. The architecture of HP3D consists of a hierarchy of dynamic sub-networks that evolve based on market demands and digitize the transfer of goods between suppliers and customers. These sub-networks are created on demand, emulate the end-to-end movement of the shipment and terminate when the delivery of goods is completed. A variation of blockchain technology is also proposed in order to increase the security level of the proposed framework.

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