Compression

More efficient XML for mobile devices {Comments Off on More efficient XML for mobile devices}

by Ricardo C
The number of mobile devices have increased in the last decade, and at this rate it is inevitable that this is the future of computing. However there are constraints that hinder the deployment, especially the limited communication bandwidth and storage space available. Since mobile devices do not have the computing power to run complex business applications typically thin online client-server applications are used to solve this barrier; however, XML is used which compromise bandwidth since XML is often for data exchange. Compressing XML files appears to be a promising solution since compressed files require less bandwidth and storage resources. One of the approaches to fix this problem would be what this article describes as Efficient XML Data Exchange Manager (EXEM) that combines context-dependent lossy and lossless compression mechanism used to support lightweight  exchange of objects in XML format between server and client applications. The main contribution of the EXEM approach is that it provides improved efficiency for XML data exchange through a semantic reduction of the XML content transferred between servers and clients. The reduction of data transfers is achieved by using known information about the application on the client side. read more...

Compress or not to Compress {1}

by Joeydes M
Summary:

This
article is about compressing HTML documents to improve web traffic and ultimately reduce traffic. It will also reduce the storage requirements of HTML data. The research was conducted by using Lossless HTML Transform (LHT) which works with general compression algorithms in conjunction. The author talks about the two main parts to the research, “The main components of the
algorithm are: a static dictionary or a semi-static dictionary of frequent alphanumerical phrases, and binary encoding of popular patterns, like numbers, dates or IP addresses.” The article then goes on to talk about the two types of compression used to bundle¬† ith this technology, one is similar to that of a “zip” file in the deflate method and the second is PPMVC. The testing files were done on HTML documents without images as well. The author found that the algorithm used in conjunction with the standard
compression the data was compress further on an average of 17%. read more...