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Cuddalore, India

Geetha K.,Periyar Arts College
ARPN Journal of Engineering and Applied Sciences

Mobile Adhoc Networks (MANETs) play the vital role in communication. It makes one to get the complete utilization of ubiquitous computing. That is data can be accessed from anywhere at any time using any devices. As the facility by using the MANETs are increased, the complications and issues are also increased. The main support to be strengthened is security. A variety of attacks exist in MANETs. The major attack which affects any communication is the Session hijacking attack. It is a multilayer attack. But, it generally affects the transport layer exploiting transmission Control protocol (TCP). It takes away the session between the source and destination. It affects the confidentiality and the Quality Of service (QOS). The attack has several variants like Active attacks, Passive attacks and Hybrid attacks. An analysis is performed to handle these attacks. Since the MANET communications are multimedia oriented, the multimedia messages are considered for transmission and study. The QoS analyses reveal that the TLD Method performs well and minimizes the effect of the attack. © 2006-2016 Asian Research Publishing Network (ARPN). Source

Geetha K.,Periyar Arts College | Sreenath N.,Pondicherry Engineering College
International Journal of Applied Engineering Research

One of the attacks which severely affect the MANET is session hijacking attack. Session hijacking attacks occur by hijacking the session established between the source and destination. When the valid session is exploited, the unauthorized access gains the highly valuable and confidential information from the session. In Mobile Adhoc Networks (MANETs), the communication takes place mainly in emergency situations and highly confidential applications like military battle field. So, this attack is viewed seriously and solutions are provided to mitigate the effect of the attack by identifying the attack at an early stage. The detection method is tested with the Quality of Service (QoS) parameters which are essential parameters to determine the effective communication like packet delivery ratio, throughput, delay, jitter and control overhead. It is found that the mitigation algorithm works well in terms of the QoS parameters. © Research India Publications. Source

Arulprakasam R.,SRM University | Dare V.R.,Madras Christian College | Gnanasekaran S.,Periyar Arts College
Journal of Discrete Algorithms

The natural language computing today demands for the study of ω-languages. Therefore in this respect it is convenient to consider fuzzy ω-languages. In this paper, the concept of fuzzy local ω-language, Büchi fuzzy local ω-language, and some closure properties of fuzzy local ω-languages are presented. We introduce deterministic fuzzy finite automaton with different acceptance mode on fuzzy ω-languages and establish the relationship between these various classes of fuzzy ω-languages. We have defined deterministic fuzzy local automaton and also establish relationships between deterministic fuzzy local automaton, fuzzy local ω-language and Büchi fuzzy local ω-language. Further we show that every fuzzy regular ω-language is a projection of a Büchi fuzzy local ω-language. © 2013 Elsevier B.V. Source

Pradeep A.,Periyar Arts College | Priyadharsini P.,Pondicherry University | Chandrasekaran G.,Pondicherry University
Journal of Alloys and Compounds

Nanoparticles of ZnFe2O4 with grain size of 30 nm have been synthesized via sol-gel auto combustion method and characterized using DSC (differential scanning calorimetry), XRD (X-ray diffraction), SEM (scanning electron microscopy), EDAX (energy dispersive X-ray analysis), FTIR (Fourier transform infrared spectroscopy), VSM (vibrating sample magnetometer) and Ac-electrical conductivity measurement setup. Structural analysis using XRD and FTIR show the formation of spinel structure in nano ZnFe2O 4 particles. The cation distribution in the sample has been estimated theoretically and the results show that as-prepared nanoparticles of ZnFe 2O4 have partially inverted ionic distribution in comparison with that of bulk zinc ferrite. Results from EDAX indicate the ratio of Fe:Zn as close to 2:1. The presence of a weak ferrimagnetic phase for nano ZnFe2O4 at room temperature has been established from its hysteresis behavior. Redistribution of cations occurring at nano-regime and surface spin canting of nanoparticles of ZnFe2O4 are expected to be responsible for the presence of magnetic ordering in nano ZnFe2O4. The Curie temperature of nano ZnFe 2O4 determined from magnetization versus temperature measurement is equal to 375 °C. The electrical conductivity of the present ZnFe2O4 at a frequency of 100 kHz at room temperature is observed to be 2.11 × 10-8 Ω-1 cm-1 which is four orders lesser in magnitude than the value of bulk ZnFe 2O4. Overall conductivity response with respect to temperature and frequency confirm that ZnFe2O4 tends to become more dielectric in the nano-regime. © 2011 Elsevier B.V. All rights reserved. Source

Chandrasekaran K.,Periyar University | Thilak Kumar R.,Periyar Arts College
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

Fluconazole is an efficient antifungal drug used in the treatment and prevention of superficial and systemic fungal infections. The molecular structure, fundamental vibrational wavenumber and intensity of the vibrational bands are interpreted, aided by density functional theory method. The results of the calculations were applied to simulated spectra of the title compound, which show excellent agreement with observed spectra. The vibrational analysis of the title compound has been carried out using FT-IR and FT-Raman spectra. Stability of the molecule arising from hyperconjugative interactions and charge delocalization has been analyzed using natural bond orbital analysis. The present investigation is extended to calculate the HOMO-LUMO energy gap, polarizability, Mulliken charges and thermodynamical properties of fluconazole at different temperature. The calculated HOMO-LUMO energy gap shows that the charge transfer occurs within the molecule. The frontier orbital and molecular electrostatic potential surface studies have been employed to understand the active sites of fluconazole. Nonlinear optical properties related to polarizability and hyperpolarizability are also discussed. The absorption characteristics and solvent analysis of fluconazole have been made using UV-Vis spectroscopic method. © 2015 Elsevier B.V. All rights reserved. Source

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