Performance Comparison of Various Speckle noise Removal Filters for Ultrasound Images

Vol.3 No.4

Year : 2013

Issue: Jun-Aug

Title : Performance Comparison of Various Speckle noise Removal Filters for Ultrasound Images

Author Name : P. Nirmaladevi, R.Asokan , S.Govindaraj , S.Usha

Synopsis :

In this paper, we propose a wavelet denoising algorithm based on adaptive wavelet thresholding technique for ultrasound images. The adaptive wavelet thresholding is a Bayesian frame work and wavelet coefficients are assumed to be General Gaussian Distribution function (GGD). The proposed algorithm performs better when compared with other shrinking technique like Visu shrink, Level shrink, and Sure shrink. This approach preserves edges and also the computational complexity is less. The image quality is measured using Peak Signal to Noise Ratio (PSNR), Mean Square Error (MSE) and Universal Quality Index (UQI).

Certain Investigation On Fully Automated Method To Segment And Measure The Volume Of Pleura Effusion On Ct Images

Vol.3 No.4

Year : 2013

Issue: Jun-Aug

Title : Certain Investigation On Fully Automated Method To Segment And Measure The Volume Of Pleura Effusion On Ct Images

Author Name : Punitha.M, Vijaykumar.J

Synopsis :

A pleural effusion is an abnormal amount of fluid around the lung. Pleural effusions can result from many medical conditions. Most pleural effusions are not serious by themselves, but some require treatment to avoid problems. The pleura is a thin membrane that lines the surface of the lungs and the inside of the chest wall outside the lungs. In pleural effusions, fluid accumulates in the space between the layers of pleura. Normally, only teaspoons of watery fluid are present in the pleural space, allowing the lungs to move smoothly within the chest cavity during breathing. Pleural effusion is an important biomarker for the diagnosis of many diseases. To develop an automated method to evaluate pleural effusion on CT scans, the measurement of which is prohibitively time consuming when performed manually. The method is based on parietal and visceral pleura extraction, active contour models, region growing. To take 2D gray scale image as input and segment the PE by using region growing method.

Detection of Unsupervised Changes in a Multi-temporal remote sensing Image

Vol.3 No.4

Year : 2013

Issue: Jun-Aug

Title : Detection of Unsupervised Changes in a Multi-temporal remote sensing Image

Author Name : G.Kowsalya, T.K.Revathi

Synopsis :

Detecting of different kinds of changes in multitemporal remote sensing images. Two Multitemporal images, acquired over the same area at different times, are independently classified and land-cover transitions are estimated according to a pixel-by-pixel comparison. Unsupervised methods available in preceding pixel-by-pixel comparison methods are not effective in handling the images. In many real applications, it fails to collect ground truth information for multitemporal images and also loss of change information should takes place. To overcome the unsupervised framework is designed for detecting the changes in remote sensing images. Two different data sets having different property representations allow to easily display and understand changed information. Here, the information about multiple kinds of changes can be preserved as well as it is easy to visualize those images. It makes the process a better one in detecting maximum number of changes from the multi temporal image. The plan is to exploit the potentialities of the proposed technique in the context of more complex approaches to change detection like those exploit multi scale/multiresolution information intrinsically present in VHR images and the ones robust to registration noise.

A Highly Durable Double Edge Triggered D-Flip Flop Based Shift Registers using 10nM CNTFET Technology

Vol.3 No.4

Year : 2013

Issue: Jun-Aug

Title : A Highly Durable Double Edge Triggered D-Flip Flop Based Shift Registers using 10nM CNTFET Technology

Author Name : RAVI.T, V. Kannan

Synopsis :

In this paper, a highly durable Double Edge Triggered D-Flip Flop based Serial in Serial Out (SISO), Serial in Parallel Out (SIPO), Parallel In Serial Out (PISO) and Parallel In Parallel Out (PIPO) shift registers are designed using 10nM Carbon Nano Tube Field Effect Transistor (CNTFET) technology. The CNTFET is a cutting edge device to overcome the current CMOS technology for its excellent electrical properties. To evaluate the durability, shift registers using CNTFET are analysed and the transient analysis are depicted. Power consumption, delay, PDP, rise time and fall time are evaluated using HSPICE with 1GHz operating frequency.

World's Quietest Room: Anechoic chambers for EMC Testing

Vol.3 No.4

Year : 2013

Issue: Jun-Aug

Title : World's Quietest Room: Anechoic chambers for EMC Testing

Author Name : Lipi K. Chhaya

Synopsis :

As we are dealing with the number of electronic gadgets and equipments in our daily life, apparently we are living in the world of waves. Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays. An electromagnetic spectrum is the range consisting of all possible frequencies of electromagnetic radiation. Electromagnetic interference is caused by electromagnetic radiation. Electromagnetic interference is a disturbance which may result into malfunctioning of equipments and health hazards to human beings. Electromagnetic compatibility is a phenomenon to describe immunity of equipment or component in electromagnetic environment. Anechoic chambers are used for electromagnetic compatibility testing. This paper describes adverse effects of electromagnetic interference and design of anechoic chamber. It provides an overview of EMI, EMC & anechoic chamber used for EMC testing and measurement to engineers and readers unfamilier with this technology

Cockcroft–Walton generator:Circuit Analysis And Applications

Vol.3 No.3

Year : 2013

Issue : Mar-May

Title : Cockcroft–Walton generator:Circuit Analysis And Applications

Author Name : Sumana Bhattacharjee

Synopsis :

A particle accelerator is a device that uses electromagnetic fields to propel charged particles to high speeds and to contain them in well-defined There are two basic classes of accelerators, known as electrostatic and oscillating field accelerators. Accelerators use static electric fields to accelerate particles. An example of this class is the Cockcroft Walton generator. The high voltage generator of the Cockcroft-Walton accelerator is a well known cascade generator or voltage multiplier circuit. By using only capacitors and diodes, it can step up relatively low voltages to extremely high values, while at the same time being far lighter and cheaper than transformers. The first accelerator of this type was built in 1932 by J.D. Cockcroft and E.T. Walton. They achieved a high voltage of about 700 kV and they studied the first nuclear reaction with an accelerator. They shared the Nobel Prize in physics for 1951.The Cockcroft-Walton generator is discussed in this paper.

Performance Evaluation of Optical Packet Switch Based on Wavelength Converters

Vol.3 No.3

Year : 2013

Issue : Mar-May

Title : Performance Evaluation of Optical Packet Switch Based on Wavelength Converters

Author Name : Ramya.S, Archana

Synopsis :

data networks built on Fiber-Optics technology, which sends data digitally, as light through connected fiber strands.A reconfigurable optical add-drop multiplexer (ROADM) is a form of optical add-drop multiplexer that adds the ability to remotely switch traffic from a wavelength division multiplexing (WDM) system at the wavelength layer. In an optical packet network with optical packet switches interconnected with optical fibers running wavelength division multiplexing (WDM), packets are transmitted from source to destination without any optical-electrical-optical (O/E/O) conversion. The optical fiber entering an optical packet switch carries several wavelengths for packet transmission.