A personal profiling approach for caching and prefetching in distributed virtual environment

Pao Yue-kong Library Electronic Theses Database

A personal profiling approach for caching and prefetching in distributed virtual environment

 

Author: Chim, Ho-pan Jimmy
Title: A personal profiling approach for caching and prefetching in distributed virtual environment
Degree: M.Phil.
Year: 2001
Subject: Virtual reality
Cache memory
Internet
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Computing
Pages: vi, 127 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1566425
URI: http://theses.lib.polyu.edu.hk/handle/200/3552
Abstract: Over the last decade, continuous evolution on both Internet and multimedia technology has turned the aspiration to Distributed Virtual Environment (DVE) across the Internet into a reality. A virtual environment usually contains a huge number of virtual objects represented by object models which are stored in a database server. When a user navigates through the virtual environment, the required data is transmitted from the server to the client machine for display through the underlying network. In this thesis, we aim at improving the performance of a DVE system across the Internet, both in terms of responsiveness and visual quality, under the existing constraint of relatively low bandwidth of the Internet. We propose the multi-resolution caching mechanism for effective manipulation of client-side caching. Our proposed multi-resolution caching mechanism exploits the progressive characteristics of the recently proposed multi-resolution modeling to improve caching performance. The caching mechanism is further complemented by a user-profiling based prefetching mechanism to predict objects that will be accessed in the future. To quantify the performance of the proposed mechanisms, we perform a number of simulated experiments. The simulation results show that our proposed caching mechanism out-performs the traditional one and the prefetching mechanism is useful in reducing the response time of the system. To validate the simulation study, we implement a prototype. We conduct a series of experiments based on the prototype, along with appropriate quantitative analysis. From the results, we identify scenarios where our approach is beneficial, resulting in shorter response time, better cache hit ratio and reduced latency. These results demonstrate the effectiveness of our proposed mechanisms for use in DVE.

Files in this item

Files Size Format
b15664259.pdf 11.44Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information