Improvisation of a Pc Based, Real Time Condition Monitoring Device for Vibration Analysis of Rotating Machines

Vol.1 No. 2

Year: 2011

Issue: Dec-Feb

Title: Improvisation of a Pc Based, Real Time Condition Monitoring Device for Vibration Analysis of Rotating Machines 

Author Name: Aparna Karwal, A.K. Mittra 

Synopsis: 

In the field of rotating machines, it is necessary to monitor & online diagnosis for the analysis of vibrations of the machine. This paper focused on vibration signals which are taken from developed prototype of a Rubber Roll Sheller Machine and FFT analysis is performed on the acquired signals under no load & load Conditions. This newly developed data acquisition system is capable of acquiring vibration data from various rotating machines under different load conditions which can further be utilized efficiently for the condition monitoring of machines under various test conditions. This approach carries simplicity & flexibility from other techniques and also it is easy to operate, quickly installed, computer friendly approach and it is cost effective.

Design of Bidirectional Buck-Boost Converter for Hybrid Vehicle

Vol.1 No. 2

Year: 2011

Issue: Dec-Feb

Title: Design of Bidirectional Buck-Boost Converter for Hybrid Vehicle 

Author Name: Uthirasamy RAMASAMY, J. Karpagam , V.Srimaheswaran 

Synopsis: 

This paper presents a new topology of Bidirectional Buck Boost Converter which produces a regulated DC output. This converter provides the steady state output using both buck and boosts operation and produces an output voltage which is maintained constant with either higher or lower input voltage. The average output voltage of buck boost converter depends upon duty cycle (D), frequency (f) and input voltage (Vs). The switching frequency is maintained at 1 kHz and the output is maintained constant at 230V DC. The main application of this project is in the working of hybrid electric vehicle. By implementing this circuit in the architecture of the hybrid electric vehicle the efficiency of operation of the vehicle is increased and the cost involved is reduced. The entire proposed circuit is designed and simulated by MATLAB\SIMULINK and verified with hardware results.

Malware and Operating Systems

Vol.1 No. 2

Year: 2011

Issue: Dec-Feb

Title: Malware and Operating Systems 

Author Name: S.Murugan, K.Kuppusamy 

Synopsis: 

Superior system and network security starts with a good indulgent of an organization’s operating environment. Organizations that have a good understanding of their operating environment and that environment’s boundaries and vulnerabilities should be able to secure their system moderately. Maintaining a high level of system security, however, is an on-going process that requires continued attention and solid organizational policies and procedures. This paper will review the various malware potential with different Operating System. It will help us to get a new system that will suitable to any operating system to safeguard from the malware.

Calculation of Mode-Coupling Coefficient of Symmetric/Asymmetric Waveguide Grating Structure

Vol.1 No. 1

Year: 2010

Issue: Sep-Nov

Title: Calculation of Mode-Coupling Coefficient of Symmetric/Asymmetric Waveguide Grating Structure 

Author Name: S. K. Raghuwanshi, V. Kumar, Radha Raman Pandey 

Synopsis:

A “Bragg Grating is a periodic perturbation of the effective absorption coefficient or effective index of an optical wave guide. A fiber Bragg grating (FBG) is a type of distributed Bragg reflector constructed in a short segment of optical fiber that reflects particular wavelength of light and transmits all others. This is achieved by adding a periodic variation to the refractive index of the fiber core. Several devices for wavelength division multiplexing (WDM) systems which utilize mode conversion in waveguides have been proposed and demonstrated. This paper demonstrates the calculation on mode coupling coefficient for the case of planar waveguide structures. We have carried out the computation for the mode coupling coefficient for the cases of degenerate as well as non-degenerate mode. Finally the interpretation of the results is carried out. The performance of FBG due to waveguide structure is predicted. We have to use FBG as a WDM component to accommodate the more number of channels. For this application we need to increase the reflection bandwidth of the reflectivity spectrum. We are also required to reduce the chirp induced in the phase spectrum due to mode coupling.  These all the performance parameters depend on the mode coupling coefficient. Hence; we try to optimize the coupling coefficient for the given cases. Finally the quantitative study has been carried out.

  

  

  

  

  

  

Semiconducting - Carbon Nanotube Field Effect Transistor Based Inverter

Vol.1 No. 1

Year: 2010

Issue: Sep-Nov

Title: Semiconducting - Carbon Nanotube Field Effect Transistor Based Inverter 

Author Name: V. Saravanan, V. Kannan 

Synopsis:

Many research groups attempt to extend Moore's law for digital circuits beyond the expected end of the CMOS scaling by proposing alternate devices. Designing MOSFETs with channel lengths much smaller than a micrometre is a challenge, and creates the problems in device fabrication, which limits advancing the integrated circuit. Small size of the MOSFET below a few tens of nanometres creates the low Trans-conductance, gate oxide leakage, low ON-current, Mobility degradation and increased delay. Problems observed in the MOSFET when size is reduced are avoided in CNTFET. Since in case of CNTFET carbon nanotube is used as channel and high-k material is used as gate dielectric and also our result shows that CNTFET exhibit the better performance than MOSFET in current conduction, In this paper, we present the spice model creation of MOSFET like CNTFET, current-voltage characteristics of an emerging nano device with classical behavior MOSFET like CNTFET. Specifically we have concentrated semi conducting carbon nanotube field effect transistor (SCNTFET), Device has been simulated using spice and also investigate the performance of digital inverter gates based on semi-conducting CNTFET.

Efficient Lossless Image Coding using Enhanced SPIHT Algorithm

Vol.1 No. 1

Year: 2010

Issue: Sep-Nov

Title: Efficient Lossless Image Coding using Enhanced SPIHT Algorithm

Author Name: P. Deepa, C. Vasanthanayaki 

Synopsis:

Lossless image compression is a subject of great importance today in the fields like medical imaging, satellite communication, testing of materials etc., as it represents an efficient way of preserving the exact data content of original image. Among the various wavelet based image coding algorithms, SPIHT (Set Partitioning In Hierarchical Tree) algorithm is a very effective and computationally simple for both lossy and lossless image coding. In the proposed work, enhanced SPIHT algorithm for image compression has been taken to achieve better lossless coding performance without harming its simplicity. The conventional SPIHT uses more bits, as it encodes four direct descendents of each significant set are found to be insignificant in the initial iteration. In the enhanced SPIHT, the significance of the direct children is tested as a group instead of sorting them separately. If the number of significant sets is much higher than insignificant sets, every set is directly partitioned without testing. The proposed enhanced SPIHT algorithm has been implemented using image processing tool box and wavelet tool box in MATLAB 7.8. Performance of the proposed algorithm has been evaluated in terms of PSNR, compression ratio, bit rate, complexity and finally it has been analyzed for noise. Also the performance is compared with the conventional SPIHT algorithm for many samples. Simulation result shows that there is a significant improvement in compression ratio and PSNR over the conventional SPIHT algorithm.

Reduction of Power Dissipation Using Gray Bus Encoder as Per Microelectronic Standard

Vol.1 No. 1

Year: 2010

Issue: Sep-Nov

Title: Reduction of Power Dissipation Using Gray Bus Encoder as Per Microelectronic Standard 

Author Name: Kamal K Mehta, R.N. Patel, M. Kowar, Sharma H.R 

Synopsis:

  

Modern computing system requires having feature of low power consumption. Attempt has been made in this direction & observed that we can attempt to reduce power consumption via adding logic circuit which in turn reduces delay in system. In such case the power requirement is mainly influenced by transition activity, which defines dynamic component of power consumption. Many encoding methods known as “Bus Encoding Technique” have been proposed to reduce transition activity.  Based upon features of bus encoding scheme, specific application has been proposed. Gray encoding scheme is credited as fundamental encoding scheme recommended for generalized application. Many factors were used to find out efficiency of any encoding method. Power requirement and delay are proven to be inversely proportional to each other. Recommendation of CODEC depends upon overhead results. This paper aims to target Gray Encoding scheme for calculating power. Work has been further extended to consider practical application in 0.25-micro meter manufacturing technology. Overhead has been calculated in terms of power consumed, against communication. It has resulted in 109.036603 milli watts of power dissipation.