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Sasikumar S.,SBM CET | Sudha S.,RVSCET | Maheswari R.U.,EGSPEC
IEEE-International Conference on Advances in Engineering, Science and Management, ICAESM-2012 | Year: 2012

Wireless mesh networks (WMNs) experience frequent link failures caused by channel interference, bandwidth demands causes severe performance degradation in WMNs. Link failure will lead to produce a sequence of disruptions to deliver the packets to the destination. To overcome this ART rerouting the traffic via an alternative path from a node whose local link is down without the need to wait until the source node knows about the failure. This is achieved by creating a new backup routing table based on the original routing table which is computed by the dijkstra algorithm. The goal of these algorithms is to reduce loss of packets, end-to-end delay time, improve throughput. © 2012 Pillay Engineering College.

Kaliyappan K.,RVSCET
Journal of Electrical Engineering and Technology | Year: 2013

This paper presents a novel nonlinear model of Switched Reluctance Generator (SRG) based on wind Energy Conversion system. Closed loop control with based Proportional Integrator current Chopping Control machine model is used. A Power converter in SRG can be controlled by using PI-CCC proposed model, and can be produced maximum power efficiency and minimize the ripple contents in the output of SRG. A second power converter namely PI based controlled PWM Inverter is used to interface the machine to the Grid. An effective control technique for the inverter, based on the pulse width modulation (PWM) scheme, has been developed to make the line voltage needs less power switching devices and each pair of turbine the generated active power starts increasing smoothly. This proposed control scheme feasibility and validity are simulated on SIMULINK/SIM POWER SYSTEMS only.

Kaliyappan K.,RVSCET
Journal of Electrical Engineering and Technology | Year: 2014

A wind generator (WG) maximum power point tracking (MPPT) system is presented here. It comprises of a variable-speed wind generator, a high-efficiency boost-type dc/dc converter and a control unit. The advantages of the aimed system are that it does not call for the knowledge of the wind speed or the optimal power characteristics and that it operates at a variable speed, thus providing high efficiency. The WG operates at variable speed and thus suffers lower stress on the shafts and gears compared to constant-speed systems. It results in a better exploitation of the available wind energy, especially in the low wind-speed range of 2.5-4.5 m/s. It does not depend on the WG wind and rotor-speed ratings or the dc/dc converter power rating. Higher reliability, lower complexity and cost, and less mechanical stress of the WG. It can be applied to battery-charging applications.

Britto K.R.A.,RVSCET | Dhanasekaran R.,Syed Ammal Engg College | Vimala R.,PSNA College of Engineering and Technology | Saranya B.,PSNA College of Engineering and Technology
2012 International Conference on Computer Communication and Informatics, ICCCI 2012 | Year: 2012

Switching power converters are sources of noise for sensitive circuits. Converters should comply with electromagnetic compatibility (EMC) rules so that the electromagnetic interference (EMI) caused by switching cannot interfere with the normal operation of adjacent circuits and also the converter itself. The produced interference can be in the form of conduction or radiation. In this paper, some techniques are used in switching converters to suppress EMI with emphasis on the conduction form. EMI analysis and evaluation of a conventional flyback converter is achieved by simulation and experimental results. In addition to evaluating some EMI suppression techniques, the main objective of this paper is to improve EMI in the topology design stage. In addition to the efficiency improvement, the effectiveness of some EMI reduction techniques is shown by practical implementation. © 2012 IEEE.

Vimala R.,PSNA College of Engineering and Technology | Baskaran K.,GCT | Aravind Britto K.R.,RVSCET
UPB Scientific Bulletin, Series C: Electrical Engineering | Year: 2012

This paper presents a filter analysis of conducted Electro-Magnetic Interference (EMI) for switching power converters (SPC) based on noise impedances. EMI filter performance depends on the noise source impedance of the circuit and the noise load impedance at the test site. The noise source impedance is due to the circuit parameters and parasitic elements in the power converter and its environment. The EMI noise is identified by time domain measurements associated with an isolated half-bridge ac-dc converter. The proposed method uses the practical approach of measuring the power converter noise spectrum and using the data to calculate the maximum possible magnitude and minimum possible magnitude of the DM and CM noise impedances. The noise impedance magnitude information aids the design of the EMI filter. The practical filters like Complete EMI filter and X2Y filter are investigated. Experimental results are also included to verify the validity of the proposed method. The results obtained satisfy the Federal Communications Commission (FCC) class A and class B regulations.

Britto K.R.A.,RVSCET | Baskaran K.,GCT | Vimala R.,PSNA College of Engineering and Technology
European Journal of Scientific Research | Year: 2012

This paper presents the modeling method applied to a switched mode Fly-back converter. The model of power converter circuit includes the main parasitic elements of its component parts. To analyze the operation mode of the switched mode flyback converter, its model is implemented with the help of PSPICE programming environment. The implementation of this model is used to simulate the behavior of the fly-back converter for both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The model and its implementation offer users an easier way to understand and analyze the operating principle of the switched mode power converters. Flyback converter is the preferred choice among the variety of switched-mode power converters, due to its low component count, cost-effective structure as well as its large dynamic range. Converters should act in agreement with Electro-Magnetic Compatibility (EMC) rules so that the electromagnetic interference (EMI) caused by switching cannot impede with the normal operation of adjacent circuits and also the converter itself. EMI analysis and evaluation of a conventional flyback converter is achieved by simulation and experimental results. © EuroJournals Publishing, Inc. 2012.

Britto K.R.A.,RVSCET | Vimala R.,PSNA College of Engineering and Technology | Saranya B.,PSNA College of Engineering and Technology
2011 International Conference on Recent Advancements in Electrical, Electronics and Control Engineering, IConRAEeCE'11 - Proceedings | Year: 2011

This paper provides a modeling approach for conducted Electromagnetic interference (EMI) in Switching Power Converters (SPC). Among the variety of switched-mode power converters, the flyback converter is the favorite choice for low power application due to its low component count, cost-effective structure as well as its large dynamic range. The simulation results declare that the derived model can almost predict EMI. © 2011 IEEE.

Sowmya S.,RVSCET | Karpaga Kannan S.,RVSCET
International Journal of Applied Engineering Research | Year: 2015

In efficient resource management, the virtualized data center is always a practical concern and it has attracted significant attention. This allocation mechanism is desired to maximize the spaces for commercial cloud providers. This paper uses overbooking and automatic from physical machine management to avoid resource over-provision problem according to its runtime demand. They propose an automatic model to control the overbooking policy while it provides usages probability based on the performance and risk estimation. To cooperate with overbooking policy, we optimize the VM placement with resource-aware strategy to satisfy application's QoS requirement. In this paper, they propose Automated VM provisioning approach in which multiple VMs are consolidated and provisioned based on an estimate of their aggregate capacity needs. To implement cloud analytics in cloud computing in which it have reached the goal of achieving the overload avoidance and green computing concept successfully. © Research India Publications.

Jegadeeswari M.,RVSCET | Kamarajan M.,RVSCET
International Journal of Applied Engineering Research | Year: 2015

Segmentation of MR brain images is increasingly being used to detect brain disorder and growth in the neonatal brain. The analysis and study of newborn brain MRI is of great interest due to its potential for studying early growth patterns and morphological changes in neuro developmental disorders. But Manual segmentation of MR images is extremely time consuming and thus an expensive process. Automated segmentation of infant MR imaging data, and especially those of preterm infants, is considerably more challenging than adult brain segmentation due to the low intensity contrast and the growth process of the white matter tissue. In existing works the segmentation technique is only depend on the structure of brain and it does not consider interior voxels. Visual inspection of the results shows that the major structures are segmented consistently. But the segmentation of regions largely affected by partial volume effect is still insufficient and is an inherent problem with voxel based classification. So this technique is not sufficient to find the disorders such as stroke, tumors etc.., In proposed, to resolve this problem an automated blood vessel segmentation is used to detect neonatal stroke in MR brain images. An EM- K means scheme is used to segment the large number of structures simultaneously for the neonatal brain. Then the fuzzy C- means clustering is used to segment the blood vessels. Finally, neural network classification algorithm is implemented to classify the diseases with improved accuracy. This could be useful to support decision making about newborn infants disability that is based on the shape and volume of the stroke. This will provide efficient results with improved accuracy rate for diagnosis diseases. © Research India Publications.

Ganesan K.,RVSCET | Sankar M.,RVSCET | Kathirvel R.,RVSCET
International Journal of Applied Engineering Research | Year: 2015

In this paper, a high step up dc-dc converter with Cockroft Walton voltage multiplier module is proposed for applications like fuel cell and photovoltaic system. The proposed converter possesses automatic uniform current sharing capability and also reduces semiconductor voltage stress. Using the proposed voltage multiplier module, an asymmetrical interleaved high step-up converter obtains high step up gain without operating at an extreme duty ratio. The voltage stress of active switches of the proposed converter is equal to one fourth of the output voltage. Hence the proposed converter enables us to adopt lower voltage rating devices to further reduce switching and conduction losses. Efficiency improves since the system uses a transformer less circuit. The modeling and simulation of the high step up converter have been using the software package plecs. © Research India Publications.

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