Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

&nbsp;

&nbsp;

VIT University

Department of Instrumentation

In general applications such as image processing signal processing and many similar applications find most of the work is done through multipliers to execute complex instructions. We generally use low order compressors for this multiplication operations. In this proposed paper, we are using higher order compressors to execute the multiplication operation. As these compressors have less delay, low power consumption but also occupies slightly larger area and this helps in incrementing of execution speed of whole multiplier.

School of Electrical Engineering

Vellore Campus

2012 International Conference on Radar, Communication and Computing (ICRCC)

FPGA implementation of high speed multiplier using higher order compressors

With the growing internet technology, science and requirement of concealing defense research work, there is a need for highly secured information exchange, which is the essence of steganography. Classic secret information could be undermined or even faked thereby, creating a menace to the core of secrecy. Steganography camouflages the hidden information into an unsuspicious digital file i.e. image, video or audio, thereby covering the existence of it. Using modified LSB substitution and readjustment procedure the mean square error has been reduced. Pixel indicator is used for increasing the embedding capacity of secret data. The security of secret data embedded into a cover file can be increased using random walk inside the file. In this paper we have used knight's tour for random walk, by not affecting the image quality. For high security while embedding, we randomize the three planes of RGB cover image using row vector, divide the image into four pixel blocks and then use Pixel value differencing (PVD) to embed data adaptively followed by knight's tour to select next block for embedding. This method gives highly secured and high capacity steganography.

Department of Communication Engineering

School of Electronics Engineering

World University root node

Fulltext

Procedia Engineering

Horse Riding &amp; Hiding in Image for Data Guarding

This paper presents radio frequency (RF) performance and high frequency stability of Double Gate Tunnel FET (DG TFET). A non-quasi static small signal model is used to extract small signal parameters which are then verified with extracted parameters through simulation. The high frequency performance of DG TFET is evaluated by extracting RF parameters like cut-off frequency (f t ), maximum oscillation frequency (f max ) and stability factor (K). The result shows that DG TFET has cut-off frequency of 350GHz and unconditionally stable from 11GHz onwards.

Department of Micro and Nanoelectronics

Department of Software Systems

School of Computer Science and Engineering

2012 International Conference on Emerging Electronics

RF and stability performance of Double Gate Tunnel FET

Wavelength Division Multiplexing (WDM) is a boon of Light wave Technology as it increases the transmission capacity and enhances the transmission distance by using optical amplification. The capacity of the present system is limited by the noise generated by the amplifiers and interactions due to nonlinearities like Cross Phase Modulation (XPM), Self Phase Modulation(SPM), Four Wave Mixing(FWM) and Stimulated Raman Scattering(SRS). This paper focuses on the design of WDM Network in order to analyze the effect of XPM on the optical transmission rate. Also the papers focus on the suppression methods that can be used in order to remove the degrading effects of these non linearity's. © 2012 Springer-Verlag.

Mechanical

School of Mechanical Engineering

Chennai Campus

VIT Unitversity

Communications in Computer and Information Science Global Trends in Computing and Communication Systems

Design of WDM Optical Networks for the Analysis of Cross Phase Modulation and Self Phase Modulation

This paper presents a simple and effective control scheme for a stand-alone Wound Rotor Induction Generator (WRIG) feeding non-linear and unbalanced loads under varying rotor speed and load conditions. Synchronous Reference Frame (SRF) method is used for the estimating the harmonic and the negative sequence components from the load current without the need to decompose load current into sequential components. Based on this estimation, the front end converter is commanded to produce currents to compensate for the content of imbalance and distortion in load current so that the stator voltage and current are of good quality. Simulation are carried out for the test set up with the generator supplying linear, non linear as well as unbalanced loads. The results establish the effectiveness of the proposed control approach. © 2012 IEEE.

2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012 - Conference Proceedings

A simple and effective control scheme for improved power quality in a stand alone Wound Rotor Induction Generator feeding non-linear and unbalanced loads

We design an ytterbium-doped large pitch photonic quasi-crystal fiber (PQF) for amplifying high-energy ultrashort laser pulses. The proposed fiber exhibits unique properties such as very large mode area (4660 μm 2), less attenuation (0.42 dB/km), high overlapping factor (0.55 for the fundamental mode), and low bending loss. These properties help amplify with high-average power ultrashort pulses with less distortion and high efficiency. To meet these requirements, we design a fiber with optimum gain filtering as well as loss filtering. From the numerical simulation of the analytical model, we confirm that the large pitch PQF plays an indispensable role in amplifying high-energy ultrashort pulses. © 2012 IEEE.

IEEE Photonics Journal

Large Pitch Photonic Quasi-Crystal Fiber Amplifier

We describe a system for the automated diagnosis of diabetic retinopathy and glaucoma using fundus and optical coherence tomography (OCT) images. Automatic screening will help the doctors to quickly identify the condition of the patient in a more accurate way. The macular abnormalities caused due to diabetic retinopathy can be detected by applying morphological operations, filters and thresholds on the fundus images of the patient. Early detection of glaucoma is done by estimating the Retinal Nerve Fiber Layer (RNFL) thickness from the OCT images of the patient. The RNFL thickness estimation involves the use of active contours based deformable snake algorithm for segmentation of the anterior and posterior boundaries of the retinal nerve fiber layer. The algorithm was tested on a set of 89 fundus images of which 85 were found to have at least mild retinopathy and OCT images of 31 patients out of which 13 were found to be glaucomatous. The accuracy for optical disk detection is found to be 97.75%. The proposed system therefore is accurate, reliable and robust and can be realized. © 2012 Pachiyappan et al.; licensee BioMed Central Ltd.

Lipids in Health and Disease

Automated diagnosis of diabetic retinopathy and glaucoma using fundus and OCT images

The setup is based on the concept of free space optical communication. In this process, communication between PC to PC using LASER light is established. The project uses IC MAX 232, which needs only a single power supply of 5V (for TTL to RS-232 and vice-versa level conversion). The communication over the short distance of 2-3 m is possible using IR diodes. The range could be increased up to hundred meters, using the laser diode module in place of IR LEDs . The laser module used is easily available as laser pointer (having about 3 mW power output). The laser beam of one module is pointed on to the photodiode of another module connected to other PC and vice-versa. By loading serial communication software and setting the port parameters to 9600 n 8 1 (here, 9600 represents baud rate, n stands for parity none, 8 represents bits per character and 1 indicates no. of stop bits)communication is established. The software program for the purpose is written in C language. Using this codes chatting and data transfer between two nodes is possible on condition that Line of Sight must exist between two nodes. © EuroJournals Publishing, Inc. 2012.

European Journal of Scientific Research

Laser based optical transceiver for data transfer of free space optical communication

Semiclosed subspaces possess many special features that distinguish them from arbitrary subspaces. Few properties of proper dense semiclosed subspaces of Hilbert spaces are discussed. © 2012 Academic Publications, Ltd.

International Journal of Pure and Applied Mathematics

On semiclosed subspaces of Hilbert spaces

A simple and implicit sensorless algorithm for estimating the rotor position and speed of the doubly fed induction machine is proposed in this study. Instead of computing the stator magnetic flux directly or indirectly, the stator flux vector components in the stationary reference frame are substituted with analytical equivalents in terms of measurable stator and rotor quantities. Thus, it is an implicit estimation process devoid of computing any flux terms and requires only the measured stator voltage and currents in stator and rotor windings apart from knowledge of the machine parameters. It is an open-loop scheme. However, it does not involve integration, recursive techniques, re-computations or programmable low-pass filters etc. Starting on the fly, accurate estimation near synchronous speed, immunity against variation in stator and rotor resistances or in the magnetising inductance are the principal advantages of the algorithm. Reduced complexity and the computational burden facilitate the easy implementation of the algorithm on a low-cost fixed point processor. Excellent agreement between the simulation and test results on a laboratory doubly fed induction motor validates the proposed estimation algorithm implemented for the vector control of a doubly fed induction motor. On the whole, the estimation algorithm is a new insight that holds promise in the area of sensorless control of the DFIM, whether used as a motor or as a generator. © 2012 The Institution of Engineering and Technology.