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Padhariya N.,Indian Institute of Technology Delhi | Mondal A.,Indian Institute of Technology Delhi | Goyal V.,Indian Institute of Technology Delhi | Shankar R.,NSIT | Madria S.K.,Missouri University of Science and Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

This work addresses the processing of top-k queries in mobile ad hoc peer to peer (M-P2P) networks using economic schemes. Our proposed economic model, designated as EcoTop, issues economic rewards to the mobile peers, which send relevant data items (i.e., those that contribute to the top-k query result), and penalizes peers for sending irrelevant items, thereby incentivizing the optimization of communication traffic. The main contributions of our work are three-fold. First, we propose the EcoTop economic model for efficient top-k query processing in M-P2P networks. Second, we propose two schemes, namely ETK and ETK+, for assigning rewards/penalties to peers and for enabling peers to re-evaluate the scores of their data items for item re-ranking purposes. Third, we conduct a performance study, which demonstrates that EcoTop is indeed effective in improving the performance of top-k queries, while minimizing the communication traffic. Notably, our novel economic incentive model also discourages free-riding in M-P2P networks. © 2011 Springer-Verlag. Source

Gaidhane V.,Gla Institute Of Technology And Management | Singh V.,NSIT | Kumar M.,University of Lucknow
Proceedings - 2nd International Conference on Advances in Recent Technologies in Communication and Computing, ARTCom 2010

Computer images consist of large data and hence require more space to store in the memory. The compressed image requires less storing space of memory and less time to transmit. In this paper, feed forward back propagation neural network method with PCA technique is used for image compression. It is found that the results using PCA techniques are not satisfactory. To improve these results author suggest another technique which has better results. The Artificial Neural Network (ANN) used in these technique is trained by considering the different numbers of hidden neurons, epoch and reconstructed image compared with original image. © 2010 IEEE. Source

Upadhyay D.K.,NSIT
Electronics Letters

Novel designs of recursive wideband digital differentiators are presented. These designs are obtained by the optimisation of magnitude response and the analysis of pole-zero plot. The beauty of these designs is that they are only of second order and have not more than 2 relative error in magnitude responses over wideband with different phase responses, thus being suitable for real-time applications. © 2010 The Institution of Engineering and Technology. Source

Upadhyay D.K.,NSIT | Singh R.K.,Uttarakhand Technical University
Electronics Letters

A new design of a recursive wideband digital differentiator is obtained by optimising the pole-zero locations of existing recursive wideband digital differentiators. Further, a new integrator design is also obtained by inverting the transfer function of the proposed digital differentiator design with suitable modifications. The beauty of these designs is that they are only of second-order recursive systems and have not more than 0.48 relative error in magnitude responses almost over the full Nyquist band, thus being suitable for real-time circuit applications. © 2011 The Institution of Engineering and Technology. Source

New designs of recursive digital differentiators are obtained by optimizing a general fourth-order recursive digital filter over different Nyquist bands. In addition, another design of recursive digital differentiators is also obtained by optimizing the specified pole-zero locations of existing recursive digital differentiator of second-order system. Further, new designs of recursive digital integrators are obtained by inverting the transfer functions of designed recursive digital differentiators with suitable modifications. Thereafter, the zero-reflection approach is discussed and then applied to improve the phase responses of the designed recursive digital differentiators and integrators. The beauty of finally obtained recursive digital differentiators and integrators is that they have nearly linear phase responses over wideband and also provide the choice of suitable recursive digital differentiator and integrator according to the importance of accuracy, bandwidth and the system simplicity. Source

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