Hitesh Kumar Sharma

Blind watermarking technique for greyscale image using DCT and 1-D Walsh coding

This paper presents a robust watermarking technique to copyright an image. Proposed technique is totally based on DCT and is different from most of the available techniques. Watermark is embedded block-wise into the image to protect the ownership against the ltering, cropping and noise attack. Before embedding the watermark we are converting it into Walsh coded watermark [1]. In proposed approach there will be a variation in gain factor two different host images. The experimental results show that the proposed approach ensures invisibility, security and robustness against signal processing.

E-COCOMO: An effort estimation model for cleanroom software development approach

The integration of mathematical modelling, proof of correctness and statistical software quality assurance lead to extremely high-quality software. The integration was named as cleanroom software engineering. It proof the correctness of the deliverables of each phase, Instead of the classic analysis, design, code, test, and debug cycle, the cleanroom approach suggests a different point of view. Due to the evolution in development methodology there is a strong need of evolution in estimation models also. In this work we have proposed the new cost estimation model. The evolved model is proposed for the new development methodologies and includes some more factors for estimation used in these new approaches.

I/O and memory management: Two keys for tuning RDBMS

In a computer system, the fastest storage component is the CPU cache, followed by the system memory. I/O to disk is thousands of times slower than an access to memory. This fact is the key for why you try to make effective use of memory whenever possible and defer I/Os whenever you can. The majority of the user response time is actually spent waiting for a disk I/O to occur. By making good use of caches in memory and reducing I/O overhead, you can optimize performance. The goal is to retrieve data from memory whenever you can and to use the CPU for other activities whenever you have to wait for I/Os. This paper examines ways to optimize the performance of the system by taking advantage of caching and effective use of the systems CPUs.

OpenECOCOMO: The algorithms and implementation of Extended Cost Constructive Model (E-COCOMO)

Traditional software development approaches is obsoleting day by day and the place is being taken by some new evolved approaches like. Cleanroom development approach, Agile development approach etc. due to the evolution in development methodology there is a strong need of evolution in estimation models also. In this work we have proposed an extended version of COCOMO that is E-COCOMO and based on this model a tool has been implemented called OpenECOCOMO. The evolved model is proposed for the new development methodologies and includes some more factors for estimation used in these new approaches.