Harmonic Optimization of Multilevel Inverters Using Hybrid GA/PSO

Year: 2012

Issue: Mar-May

Title: Harmonic Optimization of Multilevel Inverters Using Hybrid GA/PSO 

Author Name: Suryakalavathi, K. Mahendran , B. Indhumathy 

Synopsis: 

This paper presents Hybrid GA/PSO optimization (HGAPSO) technique applied to determine the switching angles of a cascaded multilevel inverter. This technique eliminates specified higher order harmonics while maintaining the required fundamental voltage. This technique can be applied to multilevel inverters with any number of levels. As an example, in this paper an eleven-level inverter is considered and the optimum switching angles are calculated offline to eliminate the 5th, 7th, 11th and 13th order harmonics. The simulation is carried out in MATLAB/Simulink package. Results show that the proposed method does effectively eliminate a great number of specific harmonics and the output voltage is resulted in low total harmonic distortion (THD).

FIR Filter Approach for Gene Prediction

Year: 2012

Issue: Mar-May

Title: FIR Filter Approach for Gene Prediction 

Author Name: Renu Sharma, Ajay Kaushik , Neeraj Sharma 

Synopsis: 

Gene prediction is a very challenging problem in the field of medical science. Gene constitute of exons and introns. Exons are responsible for encoding of proteins. The main target of gene prediction is to identify the exons. Gene identification can be done on the basis of property of codon structure that exons exhibits period-3 behavior. To identify the period-3 property, signal processing is used which uses numerical indicator sequences to process the data. This is the reason to convert the characters sequences of DNA sequences into numerical sequences (Binary indicator sequence, paired indicator sequence, real indicator sequence) and then pass through the FIR filter. The present research shows that the FIR filter gives accurate results for selected frequency range.

Secure Data Transmission Using Audio Steganography

Vol. 2 No. 3

Year: 2012

Issue: Mar-May

Title: Secure Data Transmission Using Audio Steganography 

Author Name: sakthisudhan karuppanan, S. Gayathri priya, P. Prabhu, P. Thangaraj 

Synopsis: 

In present day to day life, effective data hiding methods are needed due to attack made on data communication. This paper presents the technique for the above requirement. In this proposed method, secret message in the form of audio file is embedded within another carrier audio file (. wav) .In the transmitter end the output will be similar to the carrier with a secret message embedded inside. The hacker will be blinded by the transmitted signal. At the receiver end the original message can be retrieved without any loss. The entire proposed system is simulated and their corresponding waveforms prove the effectiveness of this method.

Step Discontinuity Analysis in an Asymmetric Single Mode Thin Planar Slab Taper Optical Waveguide

Vol. 2 No. 2

Year: 2012

Issue: Dec-Feb

Title: Step Discontinuity Analysis in an Asymmetric Single Mode Thin Planar Slab Taper Optical Waveguide 

Author Name: S. K. Raghuwanshi, Santosh Kumar 

Synopsis: 

We study the thin taper optical waveguide structure by using the step discontinuity model. The technique presented is unique and not being discussed elsewhere. We also study the power loss due to step discontinuity effect for the case of an asymmetric single mode planar slab taper waveguide structure. The only assumption, we consider is that there are no reflection of fields at the step discontinuity point. In this paper we also assume that there are no mode conversions due to discontinuity effect and the structure maintain the single mode operation even at the step discontinuity point. We deliberately considered the thin taper structure to be valid on single mode operation. The technique presented can be easily extended to more complicated waveguide structure like ridge waveguide structure.

 

 

  

   

  

 

     

Implementation of Maximum Boost Control Switching Strategy for Impedance Source Inverter

Vol. 2 No. 2

Year: 2012

Issue: Dec-Feb

Title: Implementation of Maximum Boost Control Switching Strategy for Impedance Source Inverter 

Author Name: Uthirasamy Ramasamy, C. Suganya 

Synopsis: 

This paper presents a new topology of uninterruptible power supply (UPS) by using an extended boost Z-source inverter.In this project a new topology of uninterruptible power supply (UPS) implemented using extended boost source inverter. The Z-source concept can be applied to all dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion. The extended boost Z-source inverter overcomes the conceptual and theoretical barriers and limitations of the traditional voltage source; current source and normal Z-source inverter. With this new topology, the proposed UPS can maintain the desired ac output voltage with reduced voltage drop and minimized voltage stress. The overall cost of the system has been reduced by reducing the battery utility. So, this system is more economical for UPS application. The proposed system is simulated using MATLAB / SIMULINK with the simple boost control scheme and various factors such as output voltage, boost factor and THD are analyzed.

  

 

 

  

   

  

 

     

Modeling the Quality of Service Rerouting in Cognitive Network

Vol. 2 No. 2

Year: 2012

Issue: Dec-Feb

Title: Modeling the Quality of Service Rerouting in Cognitive Network 

Author Name: Yogendra Gandole 

Synopsis: 

The cognitive behavior based on the cognitive science model for the network nodes to benefit the Quality of Service rerouting is designed. A Quality of Service rerouting protocol oriented to cognitive network is proposed. Rerouting is a distributed protocol where the route search is in a hop by hop way. Inspired by the small-world phenomenon, the experiential route information is collected and stored at each node to benefit the future route selection. We implement and evaluate Quality of Service rerouting in NS2 platform. Its performance is compared with another two popular routing protocols. The results show that Cognitive Rerouting has achieved remarkable performance improvements over the protocols where no cognitive behaviours are exploited

 

 

  

   

  

 

     

Power MOSFET in Automobile Application

 Vol. 2 No. 2

Year: 2012

Issue: Dec-Feb

Title: Power MOSFET in Automobile Application 

Author Name: D.S. Dhote, R. S. Rajuskar , G.D. Agrahari 

Synopsis: 

This paper focuses on the simulation Power mosfet inverter driving the electrical motors such as PMBLM used in automotive power electronic systems to ensure energy efficiency. Today Power mosfets are available with high voltage, high power, high frequency, protection against avalanche and short circuit behavior.  Control techniques such as Six- Step, SPWM, SVPWM are used for simulation and advantages of the drive are confirmed with the simulation results.