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Priya B.,Rajalakshmi Engineering College | Manohar S.S.,Anand Institute of Higher Technology
International Journal of Distributed Sensor Networks | Year: 2013

A novel low power medium access protocol energy efficient MAC (EE-MAC) for wireless sensor network is proposed in this paper. EE-MAC targets for improving energy efficiency, delay performance and packet delivery ratio by considering various load conditions of the network. This protocol is based on the hybrid of TDMA and FDMA approaches. The novel idea behind EE-MAC is that it uses the priority concept with hybrid MAC scheduling in order to achieve its objectives. The performance of EE-MAC is obtained through simulations for various packet sizes, traffic loads, and different scenarios which show significant improvements in packet delivery ratio, energy efficiency, and delay compared to existing protocols. © 2013 B. Priya and S. Solai Manohar.

Ramesh Babu A.,Sathyabama University | Raghavendiran T.A.,Anand Institute of higher technology
Journal of Theoretical and Applied Information Technology | Year: 2014

This paper proposes the simulation and implementation of performance enhancement of two phase interleaved boost converter using Maximum Power Point Tracking (MPPT) algorithm to achieve maximum power for Photo Voltaic (PV) application. The output current is divided by two phase since current stress on each switch is reduced. Each switch is turn on by same frequency with phase difference of π. The output of PV panel is affected by temperature and insulation level, Hence conversion efficiency is very low. To improve the efficiency, additionally the MPPT controller is used in our proposed converter to efficiently draw the maximum power from the solar panel. The maximum power point is identified using Perturb &Observe (P&O) algorithm. The Perturb &Observe algorithm suitably to track the maximum power output of two phase interleaved boost converter with proper duty ratio. This paper present simulation and implementation procedure for two phase Interleaved Boost Converter with MPPT algorithm. The simulation results are obtained by using MATLAB/SIMULINK. The simulation results for non-isolated two stage interleaved high voltage gain boost converter were compared with and without MPPT. The MATLAB/simulink simulation results are presented to validate proposed converter. The hardware prototype of 12volt input 102 volt output has been developed. © 2005 - 2014 JATIT & LLS. All rights reserved.

Jenitta J.,Anand Institute of Higher Technology | Rajeswari A.,Coimbatore Institute of Technology
2013 IEEE Conference on Information and Communication Technologies, ICT 2013 | Year: 2013

New improved methods for denoising Electrocardiogram (ECG) signal are proposed based on adaptive filter with Empirical mode Decomposition (EMD) and Ensemble Empirical mode Decomposition (EEMD). EMD and EEMD methods are used to decompose the ECG signal into intrinsic mode functions (IMF). Performance of traditional EMU based denoising methods improved by adaptively processing the IMF components which are related to ECG noise. Convergence issue to Least Mean Square (LMS) algorithm addressed by EEMD based adaptive algorithm. Block least mean square (BLMS) algorithm used with EMD and EEMD to improve the computational efficiency of adaptive processing. Proposed methods are applied on white Gaussian noise added ECG signal and real time ECG signals obtained from physionet MIT-BIH arrhythmia data base. Signal to Noise Ratio (SNR) correlation co-efficient and Mean Square Error (MSE) are used to measure and compare the performance of proposed methods with traditional EMD based methods. All the experiments done with MATLAB based coding. Results show that EEMD with BLMS algorithm performs better than traditional EMU based methods. © 2013 IEEE.

Ramesh Babu A.,Sathyabama University | Raghavendiran T.A.,Anand Institute of Higher Technology
International Journal of Applied Engineering Research | Year: 2014

This Paper proposes simulation of closed loop controlled Zero Voltage Switched (ZVS) Continuous Conduction Mode (CCM) boost converter for load and source disturbance to achieve regulated DC output voltage. The diode reverse recovery related problems of conventional hard switched boost converter can be reduced by implementing Zero Current Turn-off of diodes in CCM boost converter. The switching losses are reduced by applying Zero Voltage Switched (ZVS) turn on of active switches in CCM. The ZVS turn on of main switch’s are achieved by use of resonant network in the proposed converter. Hence ZVS CCM boost converter reduces switching loss and voltage stress of the main switch. The boost converter output voltage is regulated by using closed loop PI controller with load and source disturbance. Simulation results are presented to validate the proposed converter using MATLAB simulink software. © 2014, Research India Publications.

Kuppuswamy C.L.,Sathyabama University | Raghavendiran T.A.,Anand Institute of Higher Technology
Proceedings of IEEE International Conference on Circuit, Power and Computing Technologies, ICCPCT 2013 | Year: 2013

Renewable energy sources such as wind, solar and fuel cell have a wide voltage change range due to the nature of the sources. Fuel cell stack voltage drops greatly with current and wind generator voltage varies with wind speed and control. Photovoltaic cell's voltage varies with temperature and irradiation. The traditional voltage source inverter that has been the power conversion technology for these energy sources cannot cope with this wide voltage change nature and often requires additional voltage boost by additional DC-DC converter. The Z-source inverters can solve this problem. Multilevel Inverter (MLI) has been recognized as an attractive topology for high voltage DC-AC conversion. This paper presents design of Impedance (Z) Source network for Neutral Point Clamped (NPC) three level inverter. This inverter uses single impedance source network and less clamping diodes. The operating modes of Z-Source Inverter (ZSI) are Shoot through mode, Active and Open mode. The detailed design aspects in these modes are presented. © 2013 IEEE.

Kuppuswamy C.L.,Sathyabama University | Raghavendiran T.A.,Anand Institute of Higher Technology
European Journal of Scientific Research | Year: 2012

A multilevel inverter can eliminate the need for the step-up transformer and reduce the harmonics produced by the inverter. Although the multilevel inverter structure was initially introduced as a means of reducing the output waveform harmonic content, it was found that the dc bus voltage could be increased beyond the voltage rating of an individual power device by the use of a voltage clamping network consisting of diodes. By using voltage clamping techniques, the system KV rating can be extended beyond limits of an individual device. This paper presents Neutral Point Clamped (NPC) seven level inverter with less number of clamping diodes for linear and non-linear loads. To reduce the stress across the main switches, diodes are clamped anti-parallel to the main switches. In Earlier configurations, numbers of clamping diodes were increased proportionately with the number of levels. In this paper a seven level neutral point clamped inverter with reduced number of clamping diodes without deterioration in performance is proposed, the simulation of proposed circuit is carried out using MATLAB/Simulink and the results for the same are presented. The simulation results are validated through experimental results which are also presented in this paper. The MOSFET internal capacitance and body diodes are used for active clamping which eliminates the need for snubber. © EuroJournals Publishing, Inc. 2012.

Vaigundamoorthi M.,Anand Institute of Higher Technology | Ramesh R.,ANNAUNIVERSITY
European Journal of Scientific Research | Year: 2011

The main objective of this work is to analyze and design the high efficient modified soft controlled (ZVS-PWM) Active- Clamping Cuk (buck- boost type) converter to extract maximum power from solar Photo Voltaic (PV) module. The solar PV module, Maximum Power Point Tracking (MPPT), ZVS based Cuk converter has been modeled and simulated in MATLAB/Simulink. Using Perturb and Observer (PAO) algorithm, the maximum power is tracked from solar PV module. In order to reduce the switching losses across the switches, the soft switching has been implemented for all the three active switches of modified Cuk converter, resulting in high conversion efficiency at high-frequency operation, improved transient ,steady state response without significant increase in voltage and current stresses on switches. Simulation results, theoretical analysis, principle of operation are presented in this paper for converter and the solar PV module of 85W, inputvoltage of 17.2V, and operating at 10KHz. © 2011 EuroJournals Publishing, Inc.

Aravind Kumar S.,Anand Institute of Higher Technology
Communications in Computer and Information Science | Year: 2012

High dynamic range (HDR) is a techni que that allow a great dynamic range of luminance between the lightest and darkest area of an image. For video compression, the HDR sequence is reconstructed by inverse tone-mapping a compressed Standard dynamic range (SDR) version of the original HDR content. In this paper, we show that the appropriate choice of a Tone-mapping operator (TMO) can significantly improve the reconstructed HDR quality. It is used to compress a large range of pixel luminance in to smaller range that is suitable for display on devices with limited dynamic range. we formulate a numerical optimization problem to find the tone-curve that minimizes the expected mean square error (MSE) in the reconstructed HDR sequence. We also develop a simplified model that reduces the computational complexity of the optimization problem to a closed-form solution. It is also shown that the LDR image quality resulting from the proposed methods matches that produced by perceptually-based TMOs. © 2012 Springer-Verlag.

Roselinmary S.,Anand Institute of Higher Technology | Maheshwari M.,Anand Institute of Higher Technology | Thamaraiselvan M.,Anand Institute of Higher Technology
2013 International Conference on Information Communication and Embedded Systems, ICICES 2013 | Year: 2013

The security of VANET (Vehicular Ad Hoc Networks) is crucial as their very existence relates to critical life threatening situations. VANET is a subtype of the MANET. In which the mobile nodes are all vehicles equipped with an On-Board Unit (OBU) that enable them to send and to receive messages to the other Nodes in the network. In addition to communication among the vehicles, VANET interface with communication points provided by on road infrastructure. Many of the Researchers have already proved about the securing safety messages. Moreover VANET face several security attacks. In existing VANET systems is using a detection algorithm to detect the attacks at the verification time in which delay overhead occurred. The various security threats are misbehaving nodes give false information, Sybil attacks, selfish driver attacks, and etc. In this paper we proposed an Attacked Packet Detection Algorithm (APDA) which is used to detect the DOS (Denial-of-Service) attacks before the verification time. This minimizes the overhead delay for processing and enhances the security in VANET. © 2013 IEEE.

Karnavel K.,Anand Institute of Higher Technology | Santhoshkumar J.,Anand Institute of Higher Technology
2013 International Conference on Information Communication and Embedded Systems, ICICES 2013 | Year: 2013

The discipline of software engineering encompasses knowledge, tools, and methods for defining software requirements, and performing software design, software construction, software testing, and software maintenance tasks. In software development practice, testing accounts for as much as 50% of total development efforts. Testing can be manual, automated, or a combination of both. Manual testing is the process of executing the application and manually interacting with the application, specifying inputs and observing outputs The objective of the project is to test the software application by suitable algorithm. The proposed system has to reduce the application testing moment, easily can find out bug and solve the bug by Regression Testing. Here by we are going to using a safe efficient regression bee colony optimization algorithm(BCO) for construct control flow graphs for a procedure or program and its modified version and use these graphs to select tests that execute changed code from the original test suite. Traceability relation of completeness checking for agent errors. In traceability relation to identifying missing elements in entire application and classifying defect in the testing moment. © 2013 IEEE.

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