search query: @keyword caching / total: 10
reference: 7 / 10
« previous | next »
Author:Gagliardi, Stefano
Title:A Distributed Caching System in DTNs
Publication type:Master's thesis
Publication year:2009
Pages:(12) + 71      Language:   eng
Department/School:Tietoliikenne- ja tietoverkkotekniikan laitos
Main subject:Tietoverkkotekniikka   (S-38)
Supervisor:Ott, Jörg
Instructor:Pitkänen, Mikko
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203071321
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto  7115   | Archive
Keywords:caching
Delay-Tolerant Network (DTN)
simulation
Web
Content Distribution
Abstract (eng):Many popular services in the Internet are based on a client-server architecture.
This is not an optimal model in some cases.
Especially, where the server becomes difficult to reach due to link or path failures or traffic overloadings.
This Master's thesis presents a design, implementation and evaluation of a distributed caching system for optimization of content retrieval in Delay-Tolerant Networks (DTNs).
The presented solution proposes pushing the content closer to the requesting clients, by caching it in alternative locations on the path between client and server.
In this case, the clients are able to retrieve the content with lower latency and fewer network resource consumption.
The approach is motivated by the decreasing price of storage in caches.

The first part of the thesis introduces the research problem on a general basis, and a literature overview is given to present the current research in the field of Web caching, proactive caching in Content Distribution Networks and caching in DTN environments.
A design of the distributed caching system is then presented.
Focus is to design a node that can participate in content caching.
Theoretical approach is taken to motivate network topologies, routing protocols and distributions of the queries for simulations.

The experimental part of the thesis discusses the results of the simulations performed to evaluate the feasibility of the proposed solution.
As a result, the presented distributed caching system is shown to increase the overall retrieval performance, as well as reduce the latency for obtaining the responses.
In particular, caching policies that aggressively cache items always give the best results, however, with increasing storage costs.
Moreover, the distribution of the queried items has a major impact on retrieval performance.
ED:2009-10-07
INSSI record number: 38445
+ add basket
« previous | next »
INSSI