We present a new method for error modeling applicable to the MLP algorithm for hierarchical lossless image compression. This method, based on a concept called the variability index, provides accurate models for pixel prediction errors without requiring explicit transmission of the models. We also use the variability index to show that prediction errors do not always follow the Laplace distribut...

The volume of data generated by scientific applications through observations or computer simulations can reach to the order of the petabytes. This brings up the need for effective and compact indexing methods for efficient storage and retrieval of scientific data. Bitmap indexing has been successfully applied in this domain by exploiting the fact that scientific data are mostly read-only and en...

We present explicit formulae for the eccentric connectivity index and Wiener index of 2-dimensional square and comb lattices with open ends. The formulae for these indices of 2-dimensional square lattices with ends closed at themselves are also derived. The index for closed ends case divided by the same index for open ends case in the limit N →&infin defines a novel quantity we call compression...

Document retrieval and web search engines index large quantities of text. The static costs associated with storing the index can be traded against dynamic costs associated with using it during query evaluation. Typically, index representations that are effective and obtain good compression tend not to be efficient, in that they require more operations during query processing. In this paper we d...

In database systems, the cost of data storage and retrieval are important components of the total cost and response time of the system. A popular mechanism to reduce the storage footprint is by compressing the data residing in tables and indexes. Compressing indexes efficiently, while maintaining response time requirements, is known to be challenging. This is especially true when designing for ...

Whenever XML is used as format to exchange large amounts of data or even for data streams, the verbose behaviour of XML is one of the bottlenecks. While compression of XML data seems to be a way out, it is essential for a variety of applications that the compression result can be queried efficiently. Furthermore, for efficient path query evaluation, an index is desired, which usually generates ...

the dried fruit of terminalia chebula is widely used for its laxative properties. the objective of the present study was to examine the flowability and compressibility of terminalia chebula fruit powder, subsequently developing its tablet formulations by utilizing wet granulation and direct compression technology. initial studies on flowability and compressibility revealed that the fruit powder...

In the memoryless vector quantization scheme, each image block is independently encoded as a corresponding index and then an index table will be generated. In this paper, we apply the side match concept and propose a new scheme, which can further compress the index table without introducing extra encoding distortion. Our scheme exploits the characteristic that the blocks of images are highly co...