Title page for ETD etd-120199-181248

Type of Document Master's Thesis
Author Phan, Ngoc Anh
Author's Email Address nphan@vt.edu
URN etd-120199-181248
Title Performance Analysis of Algorithms for Supporting Disconnected Write Operations in Wireless Web Environments
Degree Master of Science
Department Computer Science
Advisory Committee
Advisor Name Title
Chen, Ing-Ray Committee Chair
Bouguettaya, Athman Committee Member
Gracanin, Denis Committee Member
  • coherency interval
  • hoading
  • performance analysis
  • disconnected operations
  • reintegration
  • web access
  • wireless mobile systems
Date of Defense 1999-11-19
Availability unrestricted
A mobile user may voluntarily disconnect itself from the web server

to save battery life and also to avoid the high communication price.

To allow web pages to be updated while the mobile user

is disconnected from the web server, updates can be staged in the

mobile unit and propagated back to the web server

upon reconnection. In this thesis, we investigate

methods for supporting disconnected write operations and

develop a performance model which helps identify the optimal

length of the disconnection period under which the cost of update

propagation is minimized.

We validate the analytic model with simulation in the thesis.

We also show how the result can be applied to real-time web applications

with a deadline requirement to propagate updates of web pages.

The analysis result is particularly applicable to web applications which

allow wireless mobile users to modify web contents while on the go.

The algorithms that we have developed can be generally applied to other

data items such as files and databases.

  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  Phanthesis.pdf 481.70 Kb 00:02:13 00:01:08 00:01:00 00:00:30 00:00:02

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