Informatics Publishing Limited

R. Rameshkumar ¹, R. Nagarajan ²

Affiliations
1 Kamaraj College of Engineering and Technology in Anna University, Viruthunagari, Tamilnadu, IN
2 Raja College of Engineering and Technology, Madurai, Tamilnadu, IN

Abstract

In this paper, novel pulse width modulation control strategies which use sine carrier waveform is proposed for seven-level cascaded inverter. In sine carrier waveform, different control strategies such as phase disposition (PD) and inverted phase disposition (IPD) are implemented. The proposed control strategies improve the total harmonic distortion and enhance the fundamental component of the output voltage. The fundamental output voltage and harmonics obtained in each method are compared with each other. The different PWM techniques adopting the constant switching frequency multicarrier are simulated for a 2KW, 3φ inverter using MATLAB/SIMULINK. The effect of switching frequency on the harmonics and fundamental output voltage are also analyzed.

Keywords

Sine Multicarrier SPWM (SMC SPWM), Sinusoidal Pulse Width Modulation (SPWM), Total Harmonic Distortion (THD).

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V. Jayalakshmi ¹, R. Rameshkumar ²

Affiliations
1 Computer Applications Department, Sudharsan Engineering College, Sathyamangalam, Tamilnadu, IN
2 Lalgudi Co-Operative Polytechnic College, Lalgudi, Tamilnadu, IN

Abstract

Ad-hoc networks are a collection of mobile hosts that communicate with each other without any infrastructure. These networks are vulnerable against many types of insider attacks including black hole attacks and selective data forwarding. Even if many previous works focused on authentication and cryptography techniques, nevertheless these techniques suffer from some weakness. We propose a novel secure multicast routing protocol designed to withstand insider attacks from colluding adversaries. Our protocol is a software-based solution and does not require additional or specialized hardware. We present simulation results that demonstrate that the proposed protocol effectively mitigates the identified insider attacks.

Keywords

Adversaries, Black Hole Attacks, Insider Attacks, Mobile Hosts.

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