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Gowtham Prasad T.V.S.,Sree Vidyanikethan Engineering College Autonomous | Varadarajan S.,Sri Venkateswara University
2015 International Conference on Communication and Signal Processing, ICCSP 2015 | Year: 2015

In recent years, extensive research has been taken for hiding data into digital audio signal because of advantages of psycho acoustical masking phenomenon of human auditory system [HAS]. This paper presents a novel method based on audio steganography by integrating optimal steganography and two level cryptographic methods. Improvement of imperceptibility of data hiding and increased security level for the secret data has been provided. In optimal steganography the random positions of the samples in audio signal are generated by a polynomial expression as a function of cover media to improve the data hiding capability. Imperceptibility of proposed method is validated using subjective and objective measures. Experimental results show that the proposed method is best suitable for hiding data in audio. © 2015 IEEE.


Devi N.S.,Sree Vidyanikethan Engineering College Autonomous | Hariprasad T.,Sree Vidyanikethan Engineering College Autonomous | Ramesh K.,Vikas Degree and PG college | Merugu R.,Mahatma Gandhi University
International Journal of ChemTech Research | Year: 2015

The antioxidant properties of coconut sap were analyzed for which studies were conducted on the reducing power, levels of ascorbic acid, polyphenol content and alpha amylase inhibitory activity. Polyphenols and ascorbic acid are very good antioxidants and possess free radical scavenging activity and thereby exhibit good reducing power. Alpha amylase inhibitors cause delay in the digestion of carbohydrates, therefore causing reduction in the rate of glucose absorption. © 2015, International Journal of ChemTech Research. All rights reserved.


Vijaya Kumar A.G.,iversity Tirupati | Nanda Gopal K.,iversity Tirupati | Varma S.V.K.,Sree Vidyanikethan Engineering College Autonomous
Advances and Applications in Fluid Mechanics | Year: 2012

Heat and mass transfer effects on unsteady free convection flow past a linearly accelerated isothermal vertical plate with variable temperature and mass diffusion in the presence of thermal radiation have been studied. The fluid considered here is gray, absorbing/emitting radiation but a non-scattering medium. At time t′ > 0, the plate is accelerated with a velocity u = u 0t′. And at the same time, the plate temperature is raised linearly with time t and also the mass is diffused from the plate linearly with respect to time. The dimensionless governing equations are tackled by the Laplace transform method. The velocity, temperature, concentration, the rate of heat transfer and the rate of mass transfer are studied for different physical parameters like thermal Grashof number (Gr), mass Grashof number (Gm), Schmidt number (Sc), Prandtl number (Pr), radiation parameter (R) and time (t) graphically. © 2012 Pushpa Publishing House.


Vadlamudi L.N.,Sree Vidyanikethan Engineering College Autonomous | Vaddella R.P.V.,Sree Vidyanikethan Engineering College Autonomous | Devara V.,JNTUH College of Engineering
Multimedia Tools and Applications | Year: 2015

In this paper, a robust hash technique for image content authentication using histogram is proposed. The histogram based hash techniques reported in the literature are robust against Content Preserving Manipulations as well as incidental distortion. The major drawback of these techniques is that, they are not sensitive to Content Changing Manipulations and also un-altered histogram image modifications. To overcome these drawbacks, we present a novel hash technique which divides the image into non-overlapped blocks and distributes histogram bins of the image block into larger containers based on the Partial Sum of pixel count of histogram bins. An intermediate hash is produced by computing the ratio of pixel count between two neighbouring containers. The intermediate image hash is obtained by concatenating intermediate hashes of image blocks. Finally, the intermediate image hash is normalized and randomly permuted with a secret key to produce a robust and secure hash. The results shows that, the proposed method performs better when compared to the existing methods against the Content Preserving manipulations. Besides, the proposed method is more sensitive to Content Changing manipulations as well as un-altered histogram image modifications. The performance results on image authentication indicate that, the proposed method has high discriminative capability and strong robustness. © 2015 Springer Science+Business Media New York


Anuraag G.P.,Sree Vidyanikethan Engineering College Autonomous | Vijay Kumar Reddy M.,Sree Vidyanikethan Engineering College Autonomous
International Journal of Engineering and Technology | Year: 2016

The metal-matrix composites are preferred due to their high hardness, light weight, flexibility, high strength, simplicity and ease of applicability which make them potentially valuable in every industrious area like motor vehicles industries, mechanical tools manufacturing industries, structural applications and aerospace industries. Electro-discharge machining is a non-conventional machining process which uses short electrical discharges to machine any material of any hardness and strength levels provided that they are electrically conductive. In this paper, an attempt was made to find the machinability of aluminium metal matrix composite using powder mixed electric discharge machining (PMEDM). The aluminium matrix was reinforced with different percentages of silicon carbide (3%, 9% & 15%) to form the composites using stir casting process. The Characteristic Material removal rate (MRR) was studied while varying the process parameters of discharge time (TON), peak current (I) and concentration of SiC in work material (C) according to the face cantered central composite design for a constant voltage of 40 volts. The Electric Discharge Machining of the composites was carried out using a copper electrode of Ø6mm and kerosene mixed with aluminium powder was used as dielectric fluid.

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