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Search Results: 1 - 10 of 138934 matches for " K. Prasanna Venkatesn "
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Parametric Study of Bonded, Riveted and Hybrid Composite Joints Using FEA
K. Mohamed Bak,K. Prasanna Venkatesn,K. Kalai Chelvan
Journal of Applied Sciences , 2012,
Abstract: The composite structural members are highly used in the following applications such as aerospace, automobiles, robotic arms, architecture etc., has attracted extensive attention in the past decades. One of the important issues in the composite technology is the repairing of aging of aircraft structures. In such applications and also for joining various composite parts together, they are fastened together either using adhesives or mechanical fasteners. Modeling and static analysis of 3-D models of the joints (bonded, riveted and hybrid) were carried out using ANSYS 11 FEA software. The results were interpreted in terms of Von Mises stress. A parametric study was also conducted to compare the performance of the hybrid joint with varying adherent thickness, adhesive thickness and overlap length. To utilize the full potential of composite materials as structural elements, the strength and stress distribution of these joints must be understood. ANSYS FEA tool has been performed to investigate the stress distribution characteristics of various configurations of single lap joint. This study was focused on the analysis of stress distribution in three prominent joining methods namely, bonded, riveted and hybrid joints. FEA is used to study the stress distribution in the members involved under various design conditions and various joints failure criteria.
Catalyst and Solvent-Free Microwave Assisted Expeditious Synthesis of 3-Indolyl-3-hydroxy Oxindoles and Unsymmetrical 3,3-Di(indolyl)indolin-2-ones  [PDF]
Prasanna K. Vuram, C. Kabilan, Anju Chadha
International Journal of Organic Chemistry (IJOC) , 2015, DOI: 10.4236/ijoc.2015.52012
Abstract: A simple and efficient method for the synthesis of 3-indolyl-3-hydroxy oxindoles and unsymmetrical 3,3-di(indolyl)indolin-2-ones using microwave irradiation without catalyst and solvent is described. A series of 3-indolyl-3-hydroxy oxindoles and unsymmetrical 3,3-di(indolyl)indolin-2-ones have been synthesized in very short reaction times of 5 and 10 minutes and in yields ranging from 31% to 98% and from 53% to 78% respectively. This method offers a significant advantage over the conventional methods in terms of simplicity and shorter reaction time. To the best of our knowledge compounds N-allyl-3-hydroxy-3-(1-methyl-indol-3-yl)indolin-2-one (6c), N-allyl-3-hydroxy-3-(5-methoxy-indol-3-yl)indolin-2-one (8c), N-benzyl-3-hydroxy-3-(1-methyl-indol-3-yl) indolin-2-one (10c), N-propargyl-3-hydroxy-3-(1-methyl-indol-3-yl)indolin-2-one (13c), N-propargyl-3-hydroxy-3-(5-methoxy-indol-3-yl)indolin-2-one (14c), 3-(5-methoxy-1H-indol-3-yl)-3-(1H-indol-3-yl)indolin-2-one (1e), 3-1-methyl(5-methoxy-1H-indol-3-yl)-3-(1H-indol-3-yl)indolin-2-one (2e), 3-1-allyl(5-methoxy-1H-indol-3-yl)-3-(1H-indol-3-yl)indolin-2-one (3e), 3-1-benzyl(5-methoxy-1H-in- dol-3-yl)-3-(1H-indol-3-yl)indolin-2-one (4e) and 3-1-(prop-2-ynyl)(5-methoxy-1H-indol-3-yl)-3(1H-indol-3-yl)indolin-2-one (5e) are reported here for the first time. All the compounds are characterized by IR, 1H, 13C NMR and HRMS.
Gait Measures and Dynamic Weight bearing in Young and Elder Trans-tibal Amputee using PTB Prosthesis with SACH foot
Prasanna K. Lenka
Al Ameen Journal of Medical Sciences , 2008,
Abstract: Objective: to investigate the changes associated with age in gait characteristics and dynamic weight bearing pattern of sound and prosthetic limb of persons with unilateral amputation. Participant: two groups of seven young (24±3.8 years) and seven elderly unilateral amputee (71±6 years) were selected for this study. Setting: both groups walked at their self selected speed over a 20 second duration plane surface walk way in trans-tibial prosthesis with PTB socket and SACH foot. The raw data of force and EMG sensors of gait analyzer were filtered, processed and analyzed with help of ‘matlab 7.0. A blue tooth enabled heart rate telemetry system was used for calculating gait efficiency in terms of physiological cost index (PCI). Results: significant differences were found in stride duration, (p=0.003), step duration sound limb (p<0.002), stance duration sound limb (p=0.002), stance duration prosthetic limb (p=0.006) and cadence (p=0.001<0.05), however no difference was found in EMG pattern of vastus lateralis between the two groups. The dynamic weight distribution showed more normalized load on anterior parts of heel and minimum load at calcaneal max in elderly group. The results of vertical ground reaction force found the prosthetic side of elderly group takes more weight than young group during loading response. In comparison, PCI was observed to be greater in case of elderly group. Conclusion: most of difference between two groups could be explained by speed variations and biomechanical limitation of ankle joint due to natural aging process.
Role of local NGOs as peer educators in slowing the slowing the spread of HIV in kasargod (1991-96)
Narahari S,Prasanna K
Indian Journal of Dermatology, Venereology and Leprology , 1999,
Abstract: The study reports the effective role of local NGOs in reaching traditional Indian community with information and education on HIV/AIDS. Target oriented IE programs with members of local NGOs as peer educators have resulted in significant slowing in the spread of HIV from the rate of 1.6% in 1992 to 0.4% in 1996.
Lymphocytoma cutis - An unusual case
Prasad PVS,Prasanna K
Indian Journal of Dermatology, Venereology and Leprology , 1994,
Synthesis and evaluation of diphenol aldimines as inhibitors of Escherichia coli ATPase and cell growth  [PDF]
Zulfiqar Ahmad, Prasanna K. Dadi, Jesse Elord, Ismail O. Kady
Advances in Biological Chemistry (ABC) , 2012, DOI: 10.4236/abc.2012.22019
Abstract: A series of structurally related diphenol aldimines (DPAs) were synthesized. These aldimines involve different substitution patterns of their phenolic groups, for the purpose of optimizing their ability to inhibit ATP synthase. The inhibitory effects of these DPA compounds were evaluated using purified F1 and membrane-bound F1F0 E. coli ATP synthase. Structure-activity relationship studies of these di-phenol compounds showed that maximum inhibition was achieved when both phenolic groups are either in the meta-positions (DPA-7, IC50 = 2.0 μM), or in the ortho-positions (DPA-9, IC50 = 5.0 μM). The lowest ATP synthase inhibition was found to be when the phenolic groups are both in the para-positions (DPA-2, IC50 = 100.0 μM). Results also show that the inhibitory effects of these compounds on ATPase are completely reversible. Identical inhibition patterns of both the purified F1 and the membrane bound F1F0 enzyme were observed. Study of E. coli cell growth showed that these diphenol aldimines effectively inhibit both ATP synthesis and cell growth.
Maximum Data Gathering in Networked Sensor Systems
Bo Hong,Viktor K. Prasanna
International Journal of Distributed Sensor Networks , 2005, DOI: 10.1080/15501320590901847
Abstract: We focus on data gathering problems in energy-constrained networked sensor systems. We study store-and-gather problems where data are locally stored at the sensors before the data gathering starts, and continuous sensing and gathering problems that model time critical applications. We show that these problems reduce to maximization of network flow under vertex capacity constraint. This flow problem in turn reduces to a standard network flow problem. We develop a distributed and adaptive algorithm to optimize data gathering. This algorithm leads to a simple protocol that coordinates the sensor nodes in the system. Our approach provides a unified framework to study a variety of data gathering problems in networked sensor systems. The performance of the proposed method is illustrated through simulations.
Optical Character Recognition (OCR) for Kannada numerals using Left Bottom 1/4th segment minimum features extraction
K.S. Prasanna Kumar
International Journal of Computer Technology and Applications , 2012,
Abstract: In this paper an algorithm to OpticalCharacter Recognition (OCR) for Kannadanumerals is discussed. The novelty exists insegmentation of the numeral into four equal partsand using one of these parts i.e., left bottomsegment to extract recognition features. Thealgorithm also proposes a single conflict resolutiontechnique to resolve conflicts while conflictingfeatures are encountered. A minimum number offeatures are extracted by the algorithm so as toimprove the response time
Selected Papers from ReconFig 2009 International Conference on Reconfigurable Computing and FPGAs (ReconFig 2009)
Lionel Torres,Viktor K. Prasanna
International Journal of Reconfigurable Computing , 2010, DOI: 10.1155/2010/679484
Rapid Energy Estimation for Hardware-Software Codesign Using FPGAs
Jingzhao Ou,Viktor K. Prasanna
EURASIP Journal on Embedded Systems , 2006, DOI: 10.1155/es/2006/98045
Abstract: By allowing parts of the applications to be executed either on soft processors (as software programs) or on customized hardware peripherals attached to the processors, FPGAs have made traditional energy estimation techniques inefficient for evaluating various design tradeoffs. In this paper, we propose a high-level simulation-based two-step rapid energy estimation technique for hardware-software codesign using FPGAs. In the first step, a high-level hardware-software cosimulation technique is applied to simulate both the hardware and software components of the target application. High-level simulation results of both software programs running on the processors and the customized hardware peripherals are gathered during the cosimulation process. In the second step, the high-level simulation results of the customized hardware peripherals are used to estimate the switching activities of their corresponding register-transfer/gate level ( ¢ € low-level ¢ € ) implementations. We use this information to employ an instruction-level energy estimation technique and a domain-specific energy performance modeling technique to estimate the energy dissipation of the complete application. A Matlab/Simulink-based implementation of our approach and two numerical computation applications show that the proposed energy estimation technique can achieve more than 6000x speedup over low-level simulation-based techniques while sacrificing less than 10% estimation accuracy. Compared with the measured results, our experimental results show that the proposed technique achieves an average estimation error of less than 12%.
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