OALib Journal期刊

ISSN: 2333-9721




2019 ( 28 )

2018 ( 181 )

2017 ( 201 )

2016 ( 324 )


匹配条件: “Pavithra P” ,找到相关结果约200478条。
Link and Location Based Routing Mechanism for Energy Efficiency in Wireless Sensor Networks
G. Pavithra,P. Devaki
Computer Science , 2014, DOI: 10.14445/22315381/IJETT-V8P239
Abstract: In Wireless Sensor Networks, sensed data are reported to the sink by the available nodes in the communication range. The sensed data should be reported to the sink with the frequency expected by the sink. In order to have a communication between source and sink, Link based routing is used. Link based routing aims to achieve an energy efficient and reliable routing path. This mechanism considers the status (current energy level in terms of Joules) of each node, link condition (number of transmissions that the Cluster Head (CH)and the Gateway (GW) candidates conducts) and the transmit power (power required for transmission in terms of Joules). A metric called Predicted Transmission Count (PTX) for each node is calculated using its status, link condition and transmit power. The node which has highest PTX will have the highest priority and it will be the potential candidate to act as CH or GW. Thus the selection of proper CH or GW reduces the energy consumption, and the network lifetime is increased.
Antibacterial and antioxidant activity of methanol extract of Evolvulus nummularius
Pavithra P,Sreevidya N,Verma Rama
Indian Journal of Pharmacology , 2009,
Abstract: Objective : To evaluate the antibacterial and antioxidant activity of methanol extract of Evolvulus nummularius (L) L. Materials and Methods : Disc diffusion and broth serial dilution tests were used to determine the antibacterial activity of the methanol extract against two Gram-positive bacterial strains (Bacillus subtilus NCIM 2718, Staphylococcus aureus ATCC 25923) and three Gram-negative bacterial strains (Pseudomonas aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC 70063 and Escherichia coli ATCC 25922). The methanol extract was subjected to preliminary phytochemical analysis. Free radical scavenging activity of the methanol extract at different concentrations was determined with 2, 2-diphenyl-1picrylhydrazyl (DPPH). Results : The susceptible organisms to the methanol extract were Escherichia coli (MIC=12.50 mg/ml) and Bacillus subtilus (MIC=3.125 mg/ml) and the most resistant strains were Staphylococcus aureus, Klebsiella pneumoniae and Pseudomonas aeruginosa. The methanol extracts exhibited radical scavenging activity with IC50 of 350 μg/ml. Conclusion : The results from the study show that methanol extract of E.nummularius has antibacterial activity. The antioxidant activity may be attributed to the presence of tannins, flavonoids and triterpenoids in the methanol extract. The antibacterial and antioxidant activity exhibited by the methanol extract can be corroborated to the usage of this plant in Indian folk medicine.
Antibacterial activity of plants used in Indian herbal medicine
Pavithra P,Janani V,Charumathi K,Indumathy R
International Journal of Green Pharmacy , 2010,
Abstract: Delonix elata , Enicostemma axillare, Merremia tridentata, Mollugo cerviana and Solanum incanum are medicinal plants used in traditional Indian medicine for the treatment of various ailments. These plants were selected to evaluate their potential antibacterial activity. To determine antibacterial activity and phytochemicals in the crude extracts of five medicinal plants used in traditional Indian medicine for the treatment of various ailments like rheumatism, piles fever, skin diseases and snake bite. The antibacterial activity of organic solvent extracts of these plants were determined by disc diffusion and broth dilution techniques against gram-positive bacterial strains (Bacillus subtilis, Staphylococcus aureus) and gram-negative bacterial strains (Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa). Results revealed that the chloroform and methanol extracts of D. elata and methanol extracts of M. cerviana exhibited significant antibacterial activity against gram-positive and gram-negative strains with minimum bactericidal concentration (MBC) ranging from 1.5 to 100 mg/ml. Methanol extracts of M. tridentata exhibited activity only against gram-positive bacterial strains with MBC ranging from 12.5 to 100 mg/ml. Extracts of E. axillare and S. incanum showed activity only against B. subtilis and were not bactericidal at 100 mg/ml. The most susceptible organism to the organic extracts from all the studied plants was B. subtilis and the most resistant organism was P. aeruginosa. The presence of phytochemicals such as alkaloids, tannins, triterpenoids, steroids and glycosides in the extracts of these plants supports their traditional uses as medicinal plants for the treatment of various ailments. The present study reveals potential use of these plants for developing new antibacterial compounds against pathogenic microorganisms.
Penetrative Bénard-Marangoni Convection in a Micropolar Ferrofluid Layer via Internal Heating and Submitted to a Robin Thermal Boundary Conditions  [PDF]
H. Nagarathnamma, A. Pavithra, C. E. Nanjundappa, S. P. Suma
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2018, DOI: 10.4236/jemaa.2018.105007
Abstract: Penetrative Bénard-Maranagoni convection in micropolar ferromagnetic fluid layer in the presence of a uniform vertical magnetic field has been investigated via internal heating model. The lower boundary is considered to be rigid at constant temperature, while the upper boundary free open to the atmosphere is flat and subject to a convective surface boundary condition. The resulting eigenvalue problem is solved numerically by Galerkin method. The stability of the system is found to be dependent on the dimensionless internal heat source strength Ns, magnetic parameter M1, the non-linearity of magnetization parameter M3, coupling parameter N1, spin diffusion parameter N3 and micropolar heat conduction parameter N5. The results show that the onset of ferroconvection is delayed with an increase in N1 and N5 but hastens the onset of ferroconvection with an increase in M1, M3, N3 and Ns. The dimension of ferroconvection cells increases when there is an increase in M3, N1, N5 and Ns and decrease in M1 and N3.
Community-based Physiotherapy in Western India: Some Findings from Surveys
Pavithra Rajan
Disability, CBR & Inclusive Development , 2013, DOI: 10.5463/dcid.v23i4.155
Abstract: Purpose: The aim of this seven-year project was to understand the perceptions of different client populations (including physiotherapists) towards community health and rehabilitation methods and identify the "gaps" in the existing system. Method: A series of surveys were conducted on several populations with functional disabilities in different parts of western India. Results: It was found that community physiotherapists with adequate motivation, knowledge and skills are insufficient in number. It appears that the community at large is in need of cost-effective preventive strategies to deal with the health problems. Future research should identify the interests of community physiotherapists, and provide adequate resources to increase their existing numbers.
S. Pavithra
Journal of Global Research in Computer Science , 2012,
Abstract: Internet and networks applications are growing very fast, so the needs to protect such applications are increased. Encryption algorithms play a main role in information security systems. . In this paper, we compare the various cryptographic algorithms. On the basis of parameter taken as time various cryptographic algorithms are evaluated on different video files. Different video files are having different processing speed on which various size of file are processed. Calculation of time for encryption and decryption in different video file format such as .vob, and .DAT, having file size for audio and for video 1MB to 1100MB respectively. Encryption processing time and decryption processing time are compared between various cryptographic algorithms which come out to be not too much. Overall time depend on the corresponding file size. Throughput analysis also done.
Optimal Testing Resource Allocation Problems in Software System using Heuristic Algorithm
M. Pavithra
Bonfring International Journal of Software Engineering and Soft Computing , 2012, DOI: 10.9756/bijsesc.10101
Abstract: Software Testing is the process of implementing a program with the definite intent of finding errors former to delivery to the end user. Due to the increase and the complexity of the software system the problem is how to optimally assign the narrow testing resource during the testing phase has become more important and difficult. Traditional Optimal Testing Resource Allocation Problems (OTRAPs) includesin afinest allocation of a limited amount of testing resources with respect to reliability, cost etc. To solve the OTRAPs with Multi-Objective Algorithms called as Hierarchy Particle Swarm Optimization Algorithm (HPSO) is suggested. Especially, organize OTRAPs for two types of multi-objective problems. First one is reliability of the system and the testing cost of the system as two objectives. Second, the total testing resource consumed is also taken into account as the third objective, sensitivity is the fourth objective. The existing algorithms require more time and the both the evolutionary and the NSGA algorithm having more drawbacks. To overcome the drawbacks of the existing algorithm, the proposed HPSO algorithm which is used in this paper, satisfy allthe four objective of this research. Experimental results show that the proposed algorithm is more efficient than the existing algorithms.
Fuzzy Based Resource Management in Broker Architecture Using Trust and Credentials
P. Varalakshmi,S. Thamarai Selvi,P. Kanchana,J. Ramesh,V. Pavithra
International Journal of Soft Computing , 2012,
Abstract: Multi-broker grid environment gives very high importance to the concept of trust. This architecture consists of entities (Consumers and Service Providers (SP)) spread across the brokers with each SP connected (logically) to more than one broker and the consumer is free to contact a broker of its choice, when it requires a service. In this study, we propose to introduce a trust management architecture that not only supports a choice of SP based on reputation (trust-index) but also on credentials (policy).Thus trustworthy SP is assigned to a consumer that not only satisfies the consumer s requirements but also its policy constraints. Thereby the consumer is assigned with a trustworthy SP and the transaction is free from runtime failure as the policies have been matched. The concept of registration of an SP to a broker has been dealt with. The concept of de-registration of an SP, has been introduced in two scenarios, one is an SP deregisters by choice and the other is the broker forcing deregistration of an SP. Publishing of brokers has been dealt with based on SOA. The SP s trust-index is updated based on both the consumer s feedback and the broker s feedback. SP s trust-index is updated periodically instead of after every transaction. The time for periodic updation of the trust-index of SP is set proportional to SP s current trust-index. This helps to reduce the brokers workload and the number of messages exchanged The consumer s trust-index is updated based on feedback from the SP. The model proposed allows the consumers to assign priorities to parameters while requesting for a service. Fuzzy logic has been incorporated to calculate the trust-index of SP in our model. This ensures the use of fuzzy inferences in the system which can handle any imprecise linguistic terms, in this case trust-index calculation effectively. This model shows a marked improvement in cost-loss reduction to the consumers and reduction in the number of messages exchanged in the environment.
Quality Improvement of Yarn by Automatic Waste Removal in Autoconer
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering , 2013,
Abstract: Spinning is the process of conversion of fibre into yarn. The spinning process includes various operations such as cotton mixing, carding, combing, drawing, winding. Winding is the final process in spinning mill where the yarn of small quantity is wound into a big package known as cones. The important aspect in winding is removal of defects or faults in yarn produced. In manual winding when there is discontinuity of thread, during removal of faults, the knot is made by a human. This reduces the quality of yarn. To overcome this disadvantage, autoconer is used. Autoconer is an advanced machine used in winding process to get a high quality yarn with low man power. Here, threads are spliced automatically. Splicing means the process of opening of broken ends and retwisting the ends after the removal of faults. Here the joined yarn looks like parent yarn. Thus, the quality of yarn is enhanced. The drawback of autoconer is, waste collected by suction motor gets deposited on the suction panel and it should be disposed manually for a periodic time interval. If the waste is not removed it reduces the operating efficiency of the suction motor. This leads to reduction in quality of yarn. The aim of the proposed work is to design an automatic waste removal system using PLC (Programmable Logic Controller) which helps us to further increase the efficiency of the suction motor and thus the quality of yarn.
The SAM Domain of Human TEL2 Can Abrogate Transcriptional Output from TEL1 (ETV-6) and ETS1/ETS2
Pavithra Vivekanand, Ilaria Rebay
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0037151
Abstract: Regulation of gene expression downstream of the Receptor Tyrosine Kinase signaling pathway in Drosophila relies on a transcriptional effector network featuring two conserved Ets family proteins, Yan and Pointed, known as TEL1 (ETV6) and ETS1/ETS2, respectively, in mammals. As in Drosophila, both TEL1 and ETS1/ETS2 operate as Ras pathway transcriptional effectors and misregulated activity of either factor has been implicated in many human leukemias and solid tumors. Providing essential regulation to the Drosophila network, direct interactions with the SAM domain protein Mae attenuate both Yan-mediated repression and PointedP2-mediated transcriptional activation. Given the critical contributions of Mae to the Drosophila circuitry, we investigated whether the human Ets factors TEL1 and ETS1/ETS2 could be subject to analogous regulation. Here we demonstrate that the SAM domain of human TEL2 can inhibit the transcriptional activities of ETS1/2 and TEL1. Drosophila Mae can also attenuate human ETS1/ETS2 function, suggesting there could be cross-species conservation of underlying mechanism. In contrast, Mae is not an effective inhibitor of TEL1, suggesting the mode of TEL2SAM-mediated inhibition of TEL1 may be distinct from how Drosophila Mae antagonizes Yan. Together our results reveal both further similarities and new differences between the mammalian and Drosophila networks and more broadly suggest that SAM domain-mediated interactions could provide an effective mechanism for modulating output from the TEL1 and ETS1/2 oncogenes.

Copyright © 2008-2017 Open Access Library. All rights reserved.