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Search Results: 1 - 10 of 138950 matches for " K. Ramya "
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Studies on the Growth and Characterization of L-Arginine Maleate Dihydrate Crystal Grown from Liquid Diffusion Technique  [PDF]
K. Ramya, C. Ramachandra Raja
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2016, DOI: 10.4236/jmmce.2016.42014
Abstract: Nonlinear optical crystals of L-Arginine maleate dihydrate were grown from liquid diffusion method. The lattice parameters of the crystal were identified using single crystal and powder crystal X-ray diffraction analyses. Fourier transform infrared spectroscopy and Fourier transform Raman spectroscopy were made to study the vibrational functional groups in the grown crystal. Optical absorption and transmission ranges were measured from UV-VIS-NIR spectrum. The molecular structure of the crystal is established through 1H-NMR and 13C-NMR studies. Thermal stabilities and decomposition of the grown crystal were studied from TG/DTA and DSC analyses. Nonlinear optical property of the crystal was determined by Kurtz and Perry powder technique.
State Space Modeling and Small Signal Stability Analysis of Synchronous Generator with Fuzzy based AVR
Ramya R,Selvi K
International Journal of Electrical and Computer Engineering , 2012, DOI: 10.11591/ijece.v2i6.1524
Abstract: This paper presents a linear mathematical model of a Synchronous Generator with excitation system for small signal stability analysis. This work aims to develop a controller based on fuzzy logic to simulate an Automatic Voltage Regulator (AVR) for a synchronous generator. The performance of fuzzy based AVR is tested on Single Machine connected to an Infinite Bus bar system (SMIB) in the MATLAB/SIMULINK platform and the results are compared with the IEEE Exciter model.
Multi Tree Data Base Architecture for Location Tracking in Next Generation Mobile Network
Sailaja M,Ramya K
International Journal of Computer Science and Engineering Survey , 2010,
Abstract: The next-generation mobile network will support terminal mobility, personal mobility, and service provider portability, making global roaming seamless. A location-independent personal telecommunication number (PTN) scheme is conducive to implementing such a global mobile system. In this paper, firstly we propose multi tree database architecture consists of a number of database subsystems, each of which is a three-level t also proposes indexing schemes for each type of location databases and analyzes their efficiency and cost in terms of database access time and storage requirement. Tree structure and is connected to the others only through its root. Results have revealed that the proposed database architecture for location management can effectively support the anticipated high user density in the future mobile networks.
Efficiently Delivering Data Packets Using Distributed Protocol for Runtime Groups Formed In Peer-to-Peer Network
Yasa Ramya,K. Bhagyalaxmi
International Journal of Research In Computer Science , 2011,
Abstract: Peer-to-Peer streaming has been widely used over the internet, where a streaming system usually has multiple channels and peers may form multiple groups for content distribution. In this paper, we propose a distributed overlay framework called SMesh (subset-mesh) for dynamic groups where users may frequently hop from one group to another. SMesh first builds a relatively stable mesh consisting of all hosts for control messaging. The mesh supports dynamic host joining and leaving, and construction of delivery trees. Using the Delaunay Triangulation protocol as an example, we show how to construct an efficient mesh with low maintenance cost. We also study about various tree constructions based on the mesh, including embedded, bypass, and intermediate trees.
Thoudam Bhaigyabati,Ramya J,K. Usha
International Research Journal of Pharmacy , 2012,
Abstract: Plant materials have been used as medicine for a wide variety of human ailments due to increase in cost of treatment, side effects of several allopathic drugs and development of resistance to currently used drugs for infectious diseases. In the present study, hyperthyroidism was induced to male Swiss albino rats orally using thyroxine for 14 days. The impact of methanolic extract of sweet corn silk in different concentrations (200, 300 & 400mg/kg) for 21 days was assessed in these animals. The serum was analyzed for thyroid hormone level and lipid profile before and during the experiment. Results showed that 400mg/kg concentration of methanolic extract has the highest effectiveness which is equal to that of standard drug to revert the hyperthyroid condition in Swiss albino rats and were confirmed with the histopathological study of the thyroid gland.
Embedded Controller for Vehicle In-Front Obstacle Detection and Cabin Safety Alert System
V.Ramya,B. Palaniappan,K. Karthick
International Journal of Computer Science & Information Technology , 2012,
Abstract: In today’s world safety and security plays an important role, hence we tend to provide a good safety and security system while travelling. Vehicles are important in today’s fast-paced society. Hence, acquiring a vehicle nowadays is considered a necessity, compared to the past where it was considered aluxury. In this thriving society, more and more vehicles are produced to meet the increasing demands of people and businesses from all corners of the world. Here comes the necessity to provide more and moresafety and security features to them. Hence this project aims to design an embedded system for vehicle cabin safety and security by modifying and integrating the existing modules. This monitors the level of the toxic gases such as CO, LPG and alcohol inside the vehicle and provides alert information in the form of alarm during the critical situations. And also send SMS to the authorised person through the GSM. An IR Sensor is used to detect the static obstacle in front of the vehicle and the vehicle gets stopped if any obstacle is detected. This may avoid accidents due to collision of vehicles with any static obstacles.
Preprocessing: A Prerequisite for Discovering Patterns in WUM Process
C. Ramya,K S Shreedhara,G Kavitha
Computer Science , 2011,
Abstract: Web log data is usually diverse and voluminous. This data must be assembled into a consistent, integrated and comprehensive view, in order to be used for pattern discovery. Without properly cleaning, transforming and structuring the data prior to the analysis, one cannot expect to find meaningful patterns. As in most data mining applications, data preprocessing involves removing and filtering redundant and irrelevant data, removing noise, transforming and resolving any inconsistencies. In this paper, a complete preprocessing methodology having merging, data cleaning, user/session identification and data formatting and summarization activities to improve the quality of data by reducing the quantity of data has been proposed. To validate the efficiency of the proposed preprocessing methodology, several experiments are conducted and the results show that the proposed methodology reduces the size of Web access log files down to 73-82% of the initial size and offers richer logs that are structured for further stages of Web Usage Mining (WUM). So preprocessing of raw data in this WUM process is the central theme of this paper.
Dynamic Grouping of Web Users Based on Their Web Access Patterns using ART1 Neural Network Clustering Algorithm
C. Ramya,G. Kavitha,K. S. Shreedhara
Computer Science , 2012,
Abstract: In this paper, we propose ART1 neural network clustering algorithm to group users according to their Web access patterns. We compare the quality of clustering of our ART1 based clustering technique with that of the K-Means and SOM clustering algorithms in terms of inter-cluster and intra-cluster distances. The results show the average inter-cluster distance of ART1 is high compared to K-Means and SOM when there are fewer clusters. As the number of clusters increases, average inter-cluster distance of ART1 is low compared to K-Means and SOM which indicates the high quality of clusters formed by our approach.
A Survey on Target Tracking Techniques in Wireless Sensor Networks
K. Ramya,K. Praveen Kumar,V. Srinivas Rao
International Journal of Computer Science and Engineering Survey , 2012,
Abstract: Target Tracking as it moves through a sensor network has become an increasingly important application in Wireless Sensor Networks. This paper examines some of the target tracking techniques in use today. An analysis of each technique is presented along with it advantages, problems and possible improvements. There are seven main categories explored in this paper. The survey promotes overview of recent research literature along with their performance comparison and evaluation.
Characterization of Thermally Evaporated In2S3 Films for Solar Cell Application
K. Ramya,M. V. Reddy,K. T. Ramakrishna Reddy
Conference Papers in Science , 2013, DOI: 10.1155/2013/515862
Abstract: Indium sulphide (In2S3) is one of the best alternatives for CdS as a buffer layer in CuInGaSe2-based thin film heterojunction solar cells. In this work, In2S3 films were prepared by thermal evaporation of In2S3 powder onto glass substrates at different temperatures that vary from 200°C to 300°C. The as-grown films were characterized using appropriate techniques to evaluate the chemical and physical properties. The X-ray diffraction analysis revealed that all the films were polycrystalline in nature with a strong (109) plane as the preferred orientation and consisted of tetragonal and cubic phases. The crystallite size and the lattice parameters are calculated. The scanning electron micrographs indicated smooth surface with fine grains. The optical analysis revealed a high optical transmittance for the layers with a direct optical band gap that varied in the range of 1.8–2.2 eV. 1. Introduction Indium sulphide (In2S3) is a chalcogenide semiconductor that belongs to the III–VI group of semiconductors with interesting fundamental properties, useful for various device applications [1, 2]. It shows n-type electrical conductivity and has a wide direct band gap of ~2.3?eV [3–5]. Depending on the growth conditions, In2S3 exists in three different crystallographic forms, namely α, β, and γ. The α-phase shows cubic crystal structure while the β-In2S3 phase crystallizes in tetragonal structure and γ-In2S3 in trigonal structure. Among these three phases, β-In2S3 is found to be stable at room temperature. In recent years, In2S3 has proved to be an important alternative buffer layer to CdS in the fabrication of Cu(In,Ga) Se2-based solar cells with solar conversion efficiencies >15%. In2S3 layers have been synthesized using a variety of chemical as well as physical techniques. These include chemical vapour deposition [6], atomic layer epitaxy [7], chemical spray pyrolysis (CSP) [8], chemical bath deposition [9], metal-organic chemical vapordeposition [10], thermal evaporation [11], and successive ionic layer adsorption and reaction [12, 13]. In this study, In2S3 films were formed on glass substrates by vacuum thermal evaporation. The effect of substrate temperature on the structural and optical properties were reported and discussed. 2. Experimental Procedure In2S3 thin films were deposited by vacuum thermal evaporation using Hind Hi Vac Box Coater (model BC: 300). 4?N pure In2S3 powder, obtained from Sigma-Aldrich, was used as the source material and evaporated from molybdenum boat. The boat was covered with quartz wool to avoid spattering of the some material during
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