VelTech Multitech Engineering College

Āvadi, India

VelTech Multitech Engineering College

Āvadi, India

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Pavithra S.,St Peters University | Rengarajan A.,Veltech Multitech Engineering College
IET Seminar Digest | Year: 2013

This paper presents a new idea in image segmentation algorithm driven by human visual system segmentation techniques and has been widely studied in the visual attention. The human eyes fixate at important locations in the scene, and every fixation point lies inside a particular region of arbitrary shape and size. we propose a method to segment the object of interest by finding the optimal closed contour around the fixation point in the polar space, The human visual system has two types of attention: overt attention (eye movements) and covert attention (without eye movement). For evaluating the segmentation result, from both region-based and boundary-based perspectives, are integrated into an objective function .Our approach can be complemented in a variety of ways, An interesting avenue has to do with learning models of the world. For example, if we had a model of a 'squirrel,' we could segment the 'squirrel,' more correctly in the region.


Varghese M.,St Peters University | Parthasarathy V.,Veltech Multitech Engineering College
Research Journal of Applied Sciences, Engineering and Technology | Year: 2014

This study aims to improve the performance of the traditional routing protocol for MANET such as DSR and AODV in terms of delay and overhead. The proposed routing scheme is called as Highly Dynamic Choice Routing (HDCR) which adopts with the highly dynamic environment of MANET. The link residual life is estimated to reduce the link failure before forwarding data through a node. The velocity of the moving mode is considered while choosing the next forwarder node. This enables the HDCR to decrease the delay in the network. The proposed routing scheme reduces routing overhead and reduces the delay. This scheme reduces the link failure too. The performance is evaluated by using the simulation results obtained by using NS2 simulator. © Maxwell Scientific Organization, 2014.


Thangeeswari T.,Veltech Multitech Engineering College | Velmurugan J.,Anna University | Priya M.,Anna University
2014 International Conference on Science Engineering and Management Research, ICSEMR 2014 | Year: 2014

In this study, the equi molar mixing of selected divalent metal ions such as Ni, Pb and Cu with ZnO nano particles are prepared through decomposition of cationic acetate solid solution. The effects on the structural, compositional and optical properties are discussed. Simple solution- thermal method is suitable and more economical for large-scale production. The powder X- ray diffraction pattern of the equal amount of divalent metal ions mixed ZnO samples shows the mixed phases of the respective divalent metal oxides apart from the wurtzite ZnO peaks. Scanning electron microscope (SEM), Fourier Transform Infrared spectroscopy (FTIR), Thermo gravimetric analysis (TGA) and UV-visible spectrophotometry were employed to characterize the samples. From the study of FTIR spectroscopy, the Zn-O bonding is shifted towards the higher wave numbers on mixing Ni, Pb and Cu oxides with the ZnO nano particles. The absorption band of ZnO/NiO, ZnO/PbO, and ZnO/CuO mixed oxides are distinctly broadened and red-shifted indicating the strong interfacial interaction between ZnO and mixed oxides. The band gap of the nano particles can be tuned in the range of 2.7-3eV by the addition of divalent metal ions. © 2014 IEEE.


Thangeeswari T.,Veltech Multitech Engineering College | Thangeeswari T.,Anna University | Murugasen P.,Saveetha Engineering College | Velmurugan J.,Anna University
Journal of Superconductivity and Novel Magnetism | Year: 2015

Dysprosium-(Dy) and cobalt (Co)-doped zinc oxide (ZnO) nanoparticles with various concentrations have been synthesized by simple chemical precipitation method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDAX) measurements were conducted respectively for the structural, morphological, and compositional investigation of the sample. XRD analysis indicated that diffraction peaks of all the samples can be indexed to the hexagonal wurtzite structure of ZnO. No secondary phases including Co and Dy ions were detected in the samples even for the highest doping concentrations of Dy. Average particle size is found to be 25–34 nm. Scanning electron microscope and transmission electron microscope analysis revealed that the dopant atoms of Co and Dy are homogeneously distributed in ZnO wurtzite structure. The samples were characterized by EDAX to confirm the expected stoichiometry. In the photoluminescence spectra, Dy co-doped samples show a violet emission along with a broad yellow emission due to the4F9/2–6H15/2 inner shell transitions of Dy3+ ion. The photoluminescence (PL) enhancement process in Dy co-doped ZnO:Co is mainly due to Dy as a sensibilizer which could effectively enhance the luminescence intensity. Absorption spectra of dysprosium- (Dy) and cobalt (Co)-doped ZnO nanoparticles exhibited enhanced optical absorption in visible region. Magnetization measurements have shown that the particles have room temperature ferromagnetic behavior with relatively high coercive fields which are decreasing with the increase of doping concentration. The analysis of optical and magnetic properties shows that Co- and Dy-doped ZnO nanoparticles are a promising material for DMS application and have potential applications in optoelectronic devices. © 2015, Springer Science+Business Media New York.


Rajesh Khanna M.,VelTech Multitech Engineering College | Dhivya M.,VelTech Multitech Engineering College
2013 International Conference on Information Communication and Embedded Systems, ICICES 2013 | Year: 2013

In recent years, there has been an increased need for the use of rule-based systems, systems required to act automatically based on events, or changes in the environment. Some events may be generated externally while others must be inferred by the system based on the other events. This event inference is inherently uncertain which is due to uncertain information sources and uncertain event occurrence. To design a solution provides us with the challenges of scalability of incoming events and inaccuracy of associated probabilities. Thus we provide a generic framework enabling such uncertain event inference in rule-based systems based on Probabilistic event model for events information, Monte Carlo sampling algorithm for approximation of probability of the events which uses selectability mechanism for improving the efficiency and performance of the overall system. The overall system works based on the prediction-correction paradigm. We also propose to use the Prioritization algorithm to prioritize client requests based on their needs and provide them with the best service. © 2013 IEEE.


Thangeeswari T.,Veltech Multitech Engineering College | Thangeeswari T.,Anna University | Velmurugan J.,Anna University | Priya M.,Saveetha Engineering College
Journal of Materials Science: Materials in Electronics | Year: 2013

Well crystalline Co-Bi co-doped ZnO nanostructures with various concentration of Bi were synthesized by simple chemical precipitation technique using metal nitrate precursors. The structural and magnetic properties of the samples calcined at 300 C for 6 h has been studied comprehensively. X-ray diffraction patterns of the pure and Co-with Bi doped samples have shown the well crystalline diffraction peaks corresponds to the characteristic wurtzite ZnO crystal structure. Aggregated nano particles have emerged with flower like morphology and it can be seen from the scanning electron microscopy and transmission electron microscopy. The average particle diameter was estimated and found to be 25-35 nm. Tunable optical band gap related to an additional electron state created by dopant was observed from the UV-Visible spectra. Typical PL emission in the UV, visible and continuous deep level emission further demonstrates that the potential application of the material in optoelectronics. Excellent ferromagnetic features of the material at room temperature reveal the additional carrier induced exchange interaction could enhance the ferromagnetism in co-doped ZnO nanostructure. The addition of Bi at 3+ states can act as donor within the semiconductor which provides the additional electron charge carrier that could involve directly to the exchange interaction effectively at certain limit and enhances the ferromagnetism. At higher doping concentration the formation of diamagnetic Bi2O3 secondary phase have contributed to change the ferromagnetic behaviour of the sample. From this study it is suggested that this kind of combined ferromagnetism and excellent optical tunability of the Bi co-doped ZnO:Co system will be the potential material for future magneto-opto-electronic devices. © 2013 Springer Science+Business Media New York.


Thangeeswari T.,Veltech Multitech Engineering College | Velmurugan J.,Anna University | Priya M.,Saveetha Engineering College
International Journal of ChemTech Research | Year: 2015

Well crystalline Co-Bi co-doped ZnO nanostructures with various concentration of Bi were synthesized by simple chemical route technique using metal acetate precursors. Xray diffraction patterns of the pure and Co with Bi doped samples have shown the well crystalline diffraction peaks corresponds to the characteristic wurtzite ZnO crystal structure. Aggregated nano particles have emerged with flower like morphology and it can be seen from the scanning electron microscopy and transmission electron microscopy. The average particle diameter was estimated and found to be 25–35 nm. Tunable optical band gap related to an additional electron state created by dopant was observed from the UV–Visible spectra. Typical PL emission in the UV, visible and continuous deep level emission further demonstrates that the potential application of the material in optoelectronics. From this study it is suggested that this kind of excellent optical tunability of the Bi co-doped ZnO: Co system will be the potential material for future opto-electronic devices. © 2015, Sphinx Knowledge House. All rights reserved.


Thangeeswari T.,Veltech Multitech Engineering College | Thangeeswari T.,Anna University | Priya M.,Saveetha Engineering College | Velmurugan J.,Anna University
Journal of Materials Science: Materials in Electronics | Year: 2015

Rare-earth metal Gadolinium (Gd3+) co-doped with ZnO:Cobalt (Co) nanoparticles are fabricated by simple, quick and versatile chemical precipitation technique. Structural, optical and magnetic studies have been carried out for Gd co-doped ZnO:Co nanoparticles. The structural analysis shows that Gd co-doped samples are single phase of wurtzite structure, where the average crystallite size of the samples is found to be nanometric regime. The morphology and chemical composition of the nanoparticles were studied using scanning electron microscopy and energy dispersive spectroscopy. Scanning electron microscopic study shows increase in particle size. In photoluminescence spectra, Gd co-doped samples show a remarkably prominent blue shift in UV region with that of pure ZnO with an increase in the intensity of green emission. The broad green emission due to the oxygen vacancy related to defect centers is present below the conduction band introduced by the Gd impurities in ZnO nanoparticles. When compared to the Co doped ZnO, Gd with ZnO:Co exhibits a clear ferromagnetism at room temperature with high coercivity. The unprecedented ferromagnetic property is attributed to the effective Ruderman–Kittel–Kasuya–Yosida exchanging interaction and change with dopant concentration Gd3+ into ZnO:Co nanoparticles. These results strongly suggest the future development of efficient luminescence and magnetic materials at normal room temperatures with Gd and Co doped ZnO nanostructures for spintronic devices. © 2015, Springer Science+Business Media New York.


Balasubramonian M.,Alagappa Chettiar College of Engineering And Technology | Rajamani V.,Veltech Multitech Engineering College
IEEE Transactions on Industrial Electronics | Year: 2014

In this paper, a real-time implementation of selective harmonic elimination pulsewidth modulation (SHEPWM) using generalized Hopfield neural network (GHNN) as applied to the single-phase inverter is designed and discussed. Finding the location of the switching instants in the case of SHEPWM involves the solution of a set of nonlinear algebraic transcendental equations. The problem is redrafted as an optimization problem, and it is solved by using GHNN. Though, in principle, the n number of harmonics can be eliminated using the presented methodology, this paper tries for the case of the elimination of the 5th-, 7th-, 11th-, and 13th-order harmonics while retaining the desired fundamental. An energy function is formulated for this problem and the set of ordinary differential equations (ODEs) describing the behavior of GHNN is obtained. A program in KEIL C was developed to solve these systems of ODEs by the Runge-Kutta fourth-order method to give the switching instants for continuously varying modulation indexes (M). A MATLAB simulation was carried out, and an experimental setup was also constructed in order to validate the simulated results. The fast Fourier transform analysis of the simulated output voltage waveform and the experimental output voltage waveform confirms the effectiveness of the proposed method. Hence, the proposed method proves that it is much applicable in the industrial applications by virtue of its suitability in real-time applications. © 1982-2012 IEEE.


Rengarajan A.,Veltech Multitech Engineering College | Rajasekaran S.,Veltech Multitech Engineering College | Kumaran P.,Anna University
International Journal of Control Theory and Applications | Year: 2016

This paper intends to propose the use of Vehicle Access Wave Standards. It can drive various number of Information Technology services which are accessible for vehicles through IEEE 802.11 and IEEE 1609. This vehicle becomes an essential service handover. One of the service handover is Media Independent Handover which is based on vertical handoff scheme. Vertical handoff scheme to connect different access networks for interacting (both safety and user application related information), VANET and vehicular users are used. At the time of intermingling, coinciding occurs in the area of heterogeneous networks. To eradicate this coinciding, VUs are allowed to do vertical handoff between several access networks. This vertical handoff plays a dynamic role in guaranteeing user quality of services and achieving enrichment of system performance. This vertical handoff scheme is functional in MIH. This MIH based vertical handoff scheme is used to upkeep multimedia services through inter-technology nodes. It is executed through NS3. From the performance analysis, dissimilar performance parameters such as number of throughput, delay, power consumption, and handoff are analyzed in heterogeneous wireless networks. Moreover to heighten these parameters, a new technique is proposed. This technique will heighten the performance parameters by selecting only one network during vertical handoff session, and also the MOP is used to denote multiple number of vertical handoff measures that will select the best available network over and done with enhanced parameter values such as latency of network should be least in the wireless network. This proposed work is simulated using NS3. The simulation outcome illustrations that the minimized handoff latency, maximum QoS and minimal cost during handover. © International Science Press.

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