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Sumathi C.P.,SDNB Vaishnav College for Women | Padmaja Valli R.,Mother Teresa Womens University | Santhanam T.,DG Vaishnav College
Journal of Theoretical and Applied Information Technology | Year: 2011

With the Internet usage gaining popularity and the steady growth of users, the World Wide Web has become a huge repository of data and serves as an important platform for the dissemination of information. The users' accesses to Web sites are stored inWeb server logs.However, the data stored in the log files do not present an accurate picture of the users' accesses to the Web site. Hence, preprocessing of the Web log data is an essential and pre-requisite phase before it can be used for knowledge-discovery or mining tasks. The preprocessed Web data can then be suitable for thediscovery and analysis of useful information referred to as Web mining. Web usage mining, a classification of Web mining, is the application of data mining techniques to discover usage patterns from clickstream and associated data stored in one or more Web servers.This paper presents an overview of the various steps involved in the preprocessing stage. © 2005 - 2011 JATIT & LLS. Source


Bakkialakshmi S.,Annamalai University | Chenthamarai S.,SDNB Vaishnav College for Women
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

Fluorescence quenching of Rhodamine B base (RhB) in DMF solution has been studied at different concentrations of the amine Triethyl amine (TEA) and n-butyl amine (NBA) at room temperature. It has been observed that the fluorescence intensity of RhB decrease with increase in the concentration of the TEA and NBA. It has been observed that the quenching due to amines proceeds via dynamic quenching process. The rate constants for the quenching process have been calculated using Stern-Volmer equation. Time resolved fluorescence study and 1H NMR spectral study have also been carried out and discussed. © 2012 Elsevier B.V. All rights reserved. Source


Lakshman B.,Bhaktavatsalam Memorial College for Women | Radha R.,SDNB Vaishnav College for Women
ARPN Journal of Engineering and Applied Sciences | Year: 2015

Early diagnosis of vision abnormalities is key focus for medical experts in order to start treatment earlier, particularly for Diabetic Retinopathy (DR) treatment. In this paper, we have presented a simple, novel algorithm to find the optic disc (OD) and macula in color retinal images which is a fundamental step in DR analysis. The proposed segmentation algorithm involves various image processing techniques such as bit-plane slicing, edge direction detection, HSI color space conversion and block searching using wavelet transformation matrix. © 2006-2015 Asian Research Publishing Network (ARPN). Source


Dhanalakshmi C.P.,University of Madras | Vijayalakshmi L.,SDNB Vaishnav College for Women | Narayanan V.,University of Madras
Journal of Bionanoscience | Year: 2012

Nano carbonated hydroxyapatite/Poly(vinyl alcohol) composites of varying composition for biomaterial applications have been synthesized. The nano Carbonated hydroxyapatite/Poly(vinyl alcohol) composite materials were characterized by XRD, FTIR, HRTEM, TGA, DTA and FESEM. Carbonated Hydroxyapatite nano rod embedded composite was prepared using poly(vinyl alcohol) as a matrix with different weight percentages (wt%). The results indicated that the size and crystallinity of Carbonated hydroxyapatite nano particles decreases with increase in poly(vinyl alcohol) concentration in the composite. SEM confirms the presence of carbonated hydroxyapatite nano rod crystals in poly(vinyl alcohol) matrix. Nano Carbonated hydroxyapatite/Poly(vinyl alcohol) composites were screened for antimicrobial activity and anti inflammatory activity. Copyright © 2012 American Scientific Publishers All rights reserved. Source


Dhanalakshmi C.P.,University of Madras | Vijayalakshmi L.,SDNB Vaishnav College for Women | Narayanan V.,University of Madras
Journal of Biomaterials and Tissue Engineering | Year: 2012

Carbonated hydroxyapatite/Poly(4-vinyl pyridine-co-styrene) nano composites of varying composition for biomaterial applications have been synthesized. The Carbonated hydroxyapatite/Poly(4-vinyl pyridine-co-styrene) nano composite materials were characterized by XRD, FTIR, 31P NMR, TGA, DTA, FESEM and TEM. Carbonated Hydroxyapatite nano rod embedded composite was prepared using Poly(4-vinyl pyridine-co-styrene) as a matrix with different weight percentages (wt%). The results indicated that the size and crystallinity of Carbonated hydroxyapatite nano particles decreases with increase in Poly(4-vinyl pyridine-co-styrene) concentration in the composite. SEM confirms the presence of carbonated hydroxyapatite nano rod crystals in Poly (4-vinyl pyridine-co-styrene) matrix. Carbonated hydroxyapatite/Poly(4-vinyl pyridine-co-styrene) nano composites were screened for antimicrobial activity and anti inflammatory activity. © 2012 American Scientific Publishers. All rights reserved. Source

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