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Search Results: 1 - 10 of 401477 matches for " M. Sreedevi "
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Morphological Filtering and Structural Coding Analysis of an Image
M. Sreedevi,P. Jenopaul
Asian Journal of Information Technology , 2012, DOI: 10.3923/ajit.2011.113.118
Abstract: This study presents an efficient algorithm that performs basic Mathematical Morphology operations like opening and closing with any arbitrary shaped structuring element. It is shown that this algorithm has a lower complexity and better computing time than all other known methods. The required computing time is independent of the image content and of the number of gray levels used. This also can slightly reduce the computational cost per size or shape. Shape parameters are extracted from objects in order to describe their shape to compare it to the shape of template objects or to partition objects into classes of different shapes. Objects can be viewed from different distances and from different points of view. Thus it is of interest to find shape parameters that are scale and rotation invariant or that are even invariant under affine or perspective projection.
Additive White Gaussian Noise Removal Using Viterbi Algorithm
M. Sreedevi,P. Jenoaul
Asian Journal of Information Technology , 2012, DOI: 10.3923/ajit.2011.119.121
Abstract: Noise removal in images is one of the most basic tasks of image processing. Algorithms for removing noises in image sequences aim to remove the additive noise while utilizing both the spatial and the temporal domains. Such an approach is expected to lead to a gain both in the denoising performance and the computational load when compared to applying a single image denoising algorithm to each image separately. We propose a new algorithm viterbi by considering 3-D (spatio-temporal) patches, a propagation of the +dictionary over time and averaging that is done on neighboring patches both in space and time. As the dictionary of adjacent frames is expected to be nearly identical, the number of required iterations per frame can be significantly reduced.
Expert System Based Power Loss Analysis of a Distribution System
M. Sreedevi,P. Jenopaul
Journal of Engineering and Applied Sciences , 2012, DOI: 10.3923/jeasci.2011.277.281
Abstract: The knowledge of power loss in an electrical distribution system is necessary to implement the strategies such as reactive power compensation and optimal system configuration. This necessitates the use of efficient feeder loss model. Power loss of distribution system is obtained by integrating the power loss of all feeders. This study presents a novel approach to analyze the real and reactive power loss of a distribution feeder using Artificial Neural Network (ANN) and GA based power loss model. Three phase load flow analysis is executed to find the sensitivity of feeder power loss with the variation in temperature, feeder power loading, conductor length and total capacity of distribution transformers and accordingly simulated data sets are generated for neural network training by way of varying these parameters. The parameters are tuned by genetic algorithm. Simulation results show that the power loss derived by using the ANN-GA model is rather consistent to that solved by the three-phase load flow analysis with an average percentage error of 3.33 and 2.16% for real and reactive power loss, respectively.
Analytical Model for the High Performance Si Channel N-MOS Process
M. Sreedevi,P. Jenopaul
Journal of Engineering and Applied Sciences , 2012, DOI: 10.3923/jeasci.2011.210.215
Abstract: A simple analytical expression for the 2D potential distribution in the Si channel n-MOS has been derived in the weak inversion regime. The analytical model includes the effect of short channel length, the influence of source to drain field on the substrate depletion depth through Voltage Doping Transformation (VDT), high-k dielectrics, interface trap charge density (Dit), gate work function and other device parameters. The analytical solution of the surface potential has been verified by the numerical solution of 2D Poisson s equation for two different values, the drain to source voltage VDS with close agreement. Based on this model, the expression for threshold voltage VTH, drain induced barrier lowering DIBL and the subthreshold slope S have been deduced. This model predictions show satisfactory agreement with the 2D numerical simulation results obtained by using MEDICI and also with reported experimental data. Further applying the model, threshold voltage and subthreshold slope have been comprehensively investigated.
Analysis of Low Power Transmitters for Wireless Micro Sensor Networks
M. Sreedevi,P. Jenopaul
Journal of Mobile Communication , 2012, DOI: 10.3923/jmcomm.2011.31.36
Abstract: In recent years, distributed wireless micro sensor networks will ensure the reliable and fault tolerant monitoring of wireless transmissions. Such micro sensors are required to operate for years with a small energy source. The working conditions of the sensor network are quite different from those of conventional wireless hand-held devices. These sensors requires communication of short packets in small area, start-up time plays a vital role in energy efficiency of transmission. One of the major challenges in constructing such networks is to maintain long network lifetime with less energy consumption. To achieve this goal, low power research is concentrated in the Wireless Sensor Network (WSN). Here, the high performance, CMOS integrated transmitters (low power CMOS FSK and MPSK modulators) are designed using 0.18 μm CMOS technology. The performance of the proposed transmitters are analyzed and the power consumption is halfly reduced for MPSK and 7 mW for FSK modulator.
Improving Transmission Rate in Single Mode Fiber Through Code Division Multiple Access Technique
M. Sreedevi,P. Jenopaul
Journal of Mobile Communication , 2012, DOI: 10.3923/jmcomm.2011.25.30
Abstract: Optical fiber is the back bone for all the communication in the modern world. But the full capacity of the fiber is not utilized efficiently. The capacity is in terabit ranges but we are only able to use it in gigabit range. This is because the information amount is get reduced by dispersion. The dispersion in the fiber is mitigated by the CDMA technique. In this study, the importance of Code Division Multiple Access (CDMA) technique in optical domain and its transmission rate improvement is summarized.
Fuzzy Based Controller for Damping of Inter-Area Oscillations Using UPFC
M. Sreedevi,P. Jenopaul
International Journal of Electrical and Power Engineering , 2012, DOI: 10.3923/ijepe.2011.125.130
Abstract: The Unified Power Flow Controller (UPFC) is the one of the FACTS devices which can control power system parameters such as terminal voltage, line impedance and phase angle. The UPFC is not only power flow controller but also power system stabilizing controller. The UPFC is a combination of Static synchronous Compensator (STATCOM) and a Static Synchronous Series Compensator (SSSC) which are coupled via a common dc link to allow bi-directional flow of real power between the series output terminals of the SSSC and the shunt output terminals of the STATCOM. UPFC is the one FACTS device which can control real and reactive power flow. UPFC can control the power system parameters such as terminal voltage, line impedance and phase angle. UPFC control provides additional damping during oscillations. The dynamic models of UPFC are used to design suitable controllers for power flow, voltage and damping controls. Fuzzy logic controller based UPFC is taken in this research. The parameters of UPFC (mB, mE, δB and δe) can be modulated for achieving desired damping in the system. The performance of the four UPFC based damping controllers (mB, mE, δB and δE ) and fuzzy based controllers are investigated under wide variations of the loading conditions in this research. A Single-Machine-Infinite-Bus (SMIB) system installed with UPFC is considered. The static excitation system model type IEEE-ST1A has been considered in this study. The UPFC considered here is assumed to be based on Pulse Width Modulation (PWM) converters.
Image Enhancement Using Spatial Filtering Technique
M. Sreedevi,P. Jenopaul
Journal of Engineering and Applied Sciences , 2012, DOI: 10.3923/jeasci.2011.180.184
Abstract: The goal of image enhancement technique is to improve a characteristics or quality of an image such that the resulting image is better than the original image. Histogram Equalization (HE) is widely used for contrast enhancement. However, it tends to change the brightness of an image and hence, not suitable for consumer electronic products where preserving the original brightness is essential to avoid annoying artifacts.
Removing Redundancy in Partial Discharge Cables Using Continuous Wavelet Transform
M. Sreedevi,P. JenoPaul
Research Journal of Applied Sciences , 2012, DOI: 10.3923/rjasci.2011.150.152
Abstract: Medium and high voltage power cables are widely used in the electrical industry. This study describes about the implementation of continuous wavelet transform techniques to reject noise from on-line partial discharge measurements on cables. Different types of redundancy are detected and it is removed by the use of continuous wavelet transformation.
An Efficient Image Segmentation Using Hough Transformation
M. Sreedevi,P. Jeno Paul
Asian Journal of Information Technology , 2012, DOI: 10.3923/ajit.2011.108.112
Abstract: In MRF based unsupervised segmentation, the MRF model parameters are typically estimated. Those global statistics are far from accurate for local areas if the image is highly non-stationary and hence will generate false boundaries. This study mainly deals with an image segmentation using Hough transformation method. The proposed method is an improvement of building a hierarchical representation of the image content and allows various region features and even domain knowledge to be incorporated in the segmentation process. The algorithm has been successfully tested on several artificial images.
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