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Search Results: 1 - 10 of 325186 matches for " S. Prabakar "
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An investigation of volumetric and corpus callosum dimension to detect brain disorders  [PDF]
S. Prabakar, K. Porkumaran
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.57047
Abstract: Alzheimer’s disease (AD), Mental retardation, Cerebral Palsy, and other Dementias are the neurogenerative brain disorders which are statistically proven that 2% - 3% of people affected in the world today. The proposed method considered the symptoms which stands distinct for Alzheimer’s disease. Many structural neuroimaging studies have found the atrophy of the Corpus Callosum (CC) and the decrease in brain volume in AD. The measurement, area has been extracted from the gradient mask of the image to characterize the local atrophy of the CC. The result showed decreased area of the CC in AD when compared to the control groups. The volume has also been calculated by volume rendering and voxel size measurement for the same set of control groups and was found to be reduced in the AD patients. These findings confirmed the pathology characteristics in AD of brain disorders. The system’s validity with respect to results obtained with conventional diagnosis has been examined and proved to offer better results.
Low Cost Hand Vein Authentication System on Embedded Linux Platform
Gayathri S,K Gerard Joe Nigel,S Prabakar
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: Biometrics is one of the highly accurate technologies in the field of user identification. This paper presents a low costcontactless biometric identification system on Embedded Linux platform which is used to authenticate a person using the vein pattern in hand. As the system uses the vein pattern which is unique to each individual and is contained within human body, it is highly secure and accurate. Moreover, its contact less feature gives it a hygienic advantage over other personal authentication technologies. The system works by capturing a person’s vein pattern image by radiating it with near -infrared rays. The deoxygenated blood in the vein absorbs the near infrared radiation and thus the vein pattern appearsas black areas in the image. This captured pattern is stored as a template for the user verification. The experimental results of the proposed system shows that the dorsal hand vein pattern is highly unique and is a better alternative for other personal authentication systems. Also, the use of low cost ccd camera and open source Embedded Linux made the system cheaper than the conventional systems without risking accuracy.
Growth Kinetics of Ion Beam Sputtered Al-thin films by Dynamic Scaling Theory
Neha Sharma,K. Prabakar,S. Dash,A. K. Tyagi
Physics , 2014, DOI: 10.1016/j.tsf.2014.10.094
Abstract: This paper reports the study of growth kinetics of ion beam sputtered aluminum thin films. Dynamic scaling theory was used to derive the kinetics from AFM measurements. AFM imaging revealed that surface incorporates distinctly different morphologies. Variation in deposition times resulted in such distinctiveness. The growth governing static (alpha) as well as dynamic (beta) scaling exponents have been determined. The exponent (alpha) decreased as the deposition time increased from 3 to 15 minutes. Consequently, the interfacial width (xi) also decreased with critical length (Lc), accompanied with an increase in surface roughness. Surface diffusion becomes a major surface roughening phenomenon that occurs during deposition carried out over a short period of 3 minutes. Extension of deposition time to 15 minutes brought in bulk diffusion process to dominate which eventually led to smoothening of a continuous film.
Partial characterization of toxins associated with stem end rot of mango caused by Lasiodiplodia theobromae
S. Parthasarathy, G. Thiribhuvanamala, P. Mohammed Faisal, K. Prabakar
Journal of Applied & Natural Science , 2016,
Abstract: In this study, the toxicity of liquid culture media from different isolates of Lasiodiplodia theobromae was characterized and some properties of the toxic metabolites were distinguished. In this work toxin producing ability of L. theobromae was revealed by studying the physical parameters viz., osmotic potential, toxin concentration, pH, temperature and biological parameter like host specificity and wilting index. The obtained results showed that the optimal toxin-production conditions for L. theobromae in potato dextrose broth under pH 6.0, at 25-35°C for 7 days. The liquid culture from all isolates were toxic to mango plants and induced the rapid wilting. The toxin obtained from the liquid culture has thermal, acid base stability and a broad range of toxicity to main host and non-host plants. Moreover, the direct bioassay for two components of the liquid filtrates precipitated by ethanol showed that the active ingredient of the toxin is a kind of non protein substance, which was further endorsed by the papain hydrolysis analysis. Our results confirmed the chemical nature of toxic compound elucidating the favorable environmental conditions for toxin production of L. theobromae and proved potential role of toxic metabolites in the mechanism of disease development.
FPGA Implementation of Non-Linear Cryptography  [PDF]
Thammampatti Natarajan Prabakar, Balasubramanian Lakshmi, Gopalakrishnan Seetharaman
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78109
Abstract: The paper focuses on the design and Field Programmable Gate Array (FPGA) implementation of embedded system for time based dual encryption scheme with Delay Compulsion Function (DCF) and also illustrates the application of DCF in time based cryptography. Further, the strength of the time based FPGA encryption algorithm with and without using DCF is analyzed using a Nios II processor. This proposed scheme enhances the security of vital data against Brute force attack by incorporating a temporal key distribution where two different keys encrypt the data simultaneously, one being the regular key and the other being the time. The time is included using a dynamically varying number of shifts thereby allowing the system to wait for the duration and this forms the second dimension of the key. Presently, available encryption systems suffer from Brute Force attack in which all the key combinations are tried in order to find the correct key. In such a case, the time taken for breaking the key depends on the speed of the system used for cryptanalysis. The proposed system adds complexity by using dynamically varying sequence of operations, by including the time as a second dimension of the key besides minimizing the possibility of Brute Force attack and increasing the time required for cryptanalysis irrespective of the system capability. As the proposed system needs concurrent execution and real time processing, the system is implemented using Altera Stratix II FPGA and the results are presented.
Optical properties and associated Urbach energy tails in AlN thin films grown by reactively assisted ion beam sputtering: Effect of different substrate temperatures
Neha Sharma,Shilpam Sharma,K. Prabakar,S. Amirthapandian,S. Ilango,S. Dash,A. K. Tyagi
Physics , 2015,
Abstract: AlN thin films have been grown on Si (100) substrates by reactive ion beam sputter deposition at different substrate temperatures varying from room temperature (RT) to 500oC. UV-VIS spectrophotometry has been employed to probe the optical properties of grown thin films in reflectance mode. It was found that optical band-gap (Eg) was decreased from 3.70 to 3.15 eV as substrate temperature was increased from RT to 400oC. Urbach energy tail (Eu) has been estimated to account for the optical disorder with associated decrease in Eg. Substrate temperature induced structural transition from amorphous at RT, nanocrystalline at 300oC to microcrystalline at 400oC has been observed by Transmission electron microscopy (TEM). Average surface roughness (Ra) and morphology has been explored by using Atomic force microscopy (AFM). Average refractive index (na) was increased as the substrate temperature was increased from RT to 100oC with a dip in extinction coefficient (ka) from 0.319 to 0.148. With further increase in substrate temperature, na followed a decreasing track in its values along with ka. This variation in na and ka values has been correlated to the corresponding surface roughness and morphology at each substrate temperature.
Herbex-Kid Inhibits Immediate Hypersensitivity Reactions in Mice and Rats
Anil Kumar,Rawal Prasad,Nanjan Mulla Jogge,Suresh Bhojraj,Solomon F. Emerson,S. Prabakar
Evidence-Based Complementary and Alternative Medicine , 2008, DOI: 10.1093/ecam/nem034
Abstract: Herbex-kid (HK), a polyherbal formulation was evaluated in various experimental allergic models of Type I hypersensitivity reactions. Compound 48/80 (C 48/80) has been shown to induce rat mesentery mast cell degranulation and HK (1.07, 10.75 and 107.5 mg ml−1) inhibited the mast cell degranulation in a dose dependent manner. HK (1.07, 10.75 and 107.5 mg kg−1; p.o.) showed dose-dependent protection against C 48/80 induced systemic anaphylaxis in male Balb/C mice. In active anaphylaxis model, male Wistar rats orally administered with 10.75 and 107.5 mg kg−1 of HK showed significant (P < 0.01) protection against mast cell degranulation, while in passive anaphylaxis model, only at 107.5 mg kg−1 showed significant (P < 0.01) reduction in mast cell degranulation. HK at all dose levels was able to significantly decrease the time spent in nasal rubbing in Wistar rats sensitized to ovalbumin, while only at 107.5 mg kg−1 it showed significant (P < 0.01) reduction in number of sneezes. In C 48/80-induced skin itch model, all dose levels of HK significantly (P < 0.001) decreased the time spent in itching and the number of itches. HK did not produce any significant inhibition in histamine induced contraction in guinea pig ileum. From the above findings we conclude that the HK possesses antiallergic activity mediated by reducing of the release mediators from mast cells and also by 5-HT antagonism without the involvement of histamine (H1) receptors.
Certain Approaches of Real Time Object Tracking in Video Sequences on Embedded Linux Platform
PG Scholar Namitha Mathew,,Asst. Prof. S. Prabakar.,,Asst. Prof. K. Gerard Joe Nigel
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: Video tracking in real time is one of the most important topic in the field of computer Vision. Detection and tracking of moving objects in the video scenes is the first relevant step in the information extraction in many computer vision applications.This idea can be used for the surveillance purpose, video annotation, traffic monitoring and also in the field of medical In this paper, we are discussing about the different methods for the video trackingusing Python Opencv software and the implementation of the tracking system on the Beagleboard XM. Background Subtraction method, and color based contour tracking are the different methods using for the tracking.And finally, we concluded that the background subtraction method is most efficient method for tracking all the moving objects in the frames.
New Remote Mutual Authentication Scheme using Smart Cards
Rajaram Ramasamy,Amutha Prabakar Muniyandi
Transactions on Data Privacy , 2009,
Abstract: Remote mutual authentication based on smart cards is the best practical solution for remote accessing. Most of the schemes are password based. In this paper we propose a new remote mutual authentication scheme using smart cards without maintaining the password table. This is based on ElGamal's. It provides high security and mutual authentication at a reasonable computational cost. Furthermore it restricts most of the current attacking mechanisms. It is simple and can be adopted in any kind of lightweight devices.
Common Fixed Point Theorem in Cone Metric Space for Rational Contractions
R. Uthayakumar,G. Arockia Prabakar
International Journal of Analysis and Applications , 2013,
Abstract: In this paper we prove the common fixed point theorem in cone metric space for rational expression in normal cone setting. Our results generalize the main result of Jaggi [10] and Dass, Gupta [11].
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