Kumar K.,Mmengineering College |
Verma A.K.,Thapar University |
Patel R.B.,D. C. R. University of Science and Technology
Malaysian Journal of Computer Science | Year: 2013
Secure Communication is important parameter in unattended and hostile environment. Wireless Sensor Networks(WSNs) are deployed and operate in vulnerabilities and are candidate networks which should be commissioned for security provisioning in end to end communications. Because of their specialized applications many solutions in terms of cryptographic, Intrusion Detection and Key Management have been proposed. Most solutions lack and seem of ignoring the fact that route is as strong as weakest link in the route with respect to other links in the route. Variance of number of keys and high average number of keys on routes is an issue that we tried to resolve in our proposal using non-uniform key pre-distribution in Heterogeneous Wireless Sensor Networks (HWSNs). Analytical and Simulation based study supports our concern and reports an improvement in Average number of keys in almost60 percent routes and decreasing variance in almost 50 percent routes in random and probabilistic neighbourhood.
Anita M.,Mmengineering College |
Vanita A.,Mmengineering College |
Maninder S.,Mmengineering College
International Journal of Earth Sciences and Engineering | Year: 2010
The challenge for civil engineering community in the coming days will be development of high performance, materials, produced at reasonable cost with the lowest possible environment impact. Taking view of sustainable development it is imperative that the supplementary cementing materials may be used to replace large amount of cement in concrete. However concrete has certain disadvantages as well; like low tensile strength, not entirely impervious to moisture and containing soluble salts which may cause efflorescence, liable to disintegrate by alkali and sulphate attack, unstable crack propagation, limited durability. Fly ash is one such admixture, which exhibits pozzolanic activity and contributes largely to enhance the workability of fresh concrete, reduces the water requirement at given consistency and increases the durability of hardened concrete which results in a product which has similar or even greater ultimate strength. Several research investigations conducted in past have clarified the effect of fly ash on different properties of concrete, but more research is still needed to study its effect on durability. The aim of present research is to investigate the effect of some aggressive chemicals on the compressive strength of fly ash concrete by replacing cement with fly ash in different percentages. The study includes the variation in the strength after immersion in the two different chemicals i.e. is sodium chloride and sulphuric acid. The objectives of using fly ash in concrete are to reduce heat of hydration and Cement content to reduce costs, secondly to improve durability and workability. © 2010 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.