Informatics Publishing Limited

Harini Vemula ¹, V. Preethi ²

Affiliations
1 Department of ECM, K.L. University, Guntur, A.P, IN
2 Dept. of ECE, Vignan Lara College of Engg., A.P, IN

Abstract

To fully exploit the benefits of using an sub adaptive filter (SAF), an almost alias free SAF structure is proposed. The inter band aliasing is removed from the sub band signal using a band width increased filter.SAF overcomes the disadvantages of full-band structure like high computational cost, slower convergence rates.

Keywords

Sub Adaptive Filter, Inter-band Aliasing

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G. Jemilda ¹, M. Rathi Matilda ¹, M. Merin Saroj Selvia ¹, V. Preethi ¹

Affiliations
1 JACSI College of Engineering, Nazareth, Tamilnadu, IN

Abstract

In cooperative networks, to transmit and receive nodes recruit neighboring nodes to assist in communication. We establish the cluster technique for co-operative transmission of data. We then propose a cooperative communication protocol for establishment of these clusters and for cooperative transmission of data. We derive the upper bound of the capacity of the protocol, and we analyze the end-to-end robustness of the protocol to data-packet loss, along with the tradeoff between energy consumption and error rate. The analysis results are used to compare the energy savings and the end-to-end robustness of our protocol with two non-cooperative schemes, as well as to another cooperative protocol published in the technical literature. For a regular line topology, it is possible to achieve energy savings of 39%. For a grid topology, it is possible to achieve energy savings of 80%, while for random node placement our cooperative protocol can save up to 40% in energy consumption relative to the other protocols. To increase the received power at receiving node and decreasing probability for bit error and packet loss. It increased lifetime of cooperative sensor networks.

Keywords

Clustering, Cooperative Networks, Energy-Efficient Protocols, Grid Topology, Wireless Networks, Error Rate Energy Consumption, End to End Robustness.

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P. Padmakumari ¹, Mary Reshma ¹, Mercy Sulochana ¹, N. Vijaya ¹, V. Preethi ¹, K. Abbulu ¹

Affiliations
1 Malla Reddy Institute of Pharmaceutical Sciences, Secunderabad, Andhra Pradesh, IN

Abstract

Aim of the present study is to investigate preliminary phyto-chemical screening and to evaluate plant extracts for analgesic, antipyretic and antimicrobial activities of different parts of Leucas aspera spreng by standard experimental methods which include anti-writhing method for analgesic activity, cup-plate diffusion method for antimicrobial activity and baker's yeast induced pyrexia method for antipyretic activity. Different parts of the plant like bud, ischolar_main, leaf, and stem were selected and extracted by cold maceration for 72 hrs. by using ethyl acetate and methanol as solvents. All crude extracts were used for preliminary phyto chemical screening. Ethyl acetate extracts were found be positive for alkaloids, glycosides, steroids, carbohydrates and terpenes. Methonolic extracts were found to be positive for alkaloids, glycosides, carbohydrates and terpenes and negative for steroids, flavonoids. In antimicrobial study all crude extract were found to be active against tested organisms. Ethyl acetate extracts were active against Gram-negative bacteria. Methonolic extracts were active against Grampositive bacteria .Among all the parts bud has maximum anti-bacterial activity followed by ischolar_main, leaf, stem .In analgesic activity ethyl acetate extracts of bud produce significant inhibition in acetic acid induced writhing's in mice at the dose of 100mg/kg and 200mg/kg. The same ethyl acetate extracts also showed significant antipyretic activity than methonolic extracts. These results suggest conformation of its traditional uses (antimicrobial, analgesic as well as antipyretic activities) of a plant and among different parts of plant bud has shown maximum activity.

Keywords

Leucas aspera, Cup-Plate Method, Writhing Method, Brewer’s Induced Pyrexia Method.

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