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Uthrakumar R.,Sterling | Uthrakumar R.,Sri Muthukumaran Institute of Technology | Vesta C.,SDNB Vaishnav College | Bhagavannarayana G.,National Physical Laboratory India | Jerome Das S.,Sterling
Journal of Alloys and Compounds | Year: 2011

Optically transparent and bulk single crystal of bis(thiourea) cadmium zinc chloride was successfully grown by unidirectional crystal growth technique. The quality of the crystal was examined by high-resolution X-ray diffraction analysis. The cell parameters and the crystallinity of the grown crystal were estimated by the single-crystal and powder X-ray diffraction analyses, respectively. Optical transmittance of the crystal was recorded using the UV-vis-NIR spectrophotometer. The optical band gap and optical constant of the material were calculated by using transmission spectrum. Microhardness measurements were made for the grown crystal using Vicker's microhardness tester. The dielectric loss and dielectric constant measurements as a function of frequency and temperature were measured for the grown crystal. © 2010 Elsevier B.V. All rights reserved.


Uthrakumar R.,Loyola College | Vesta C.,SDNB Vaishnav College | Robert R.,Government Arts College Men | Mangalam G.,Dr. M.G.R. Educational and Research Institute | Das S.J.,Loyola College
Physica B: Condensed Matter | Year: 2010

The bulk single crystal of tri-nitrophenol methyl p-hydroxybenzoate (TNMPHB) of length 90 mm and diameter 12 mm was obtained by employing unidirectional growth technique. Single crystal X-ray diffraction studies and powder XRD analysis have been carried out to confirm the identity of the crystal. The optical band gap of the grown crystal was calculated to be 4.91 eV from UV transmission spectrum. The mechanical strength of the grown crystal has been studied using Vicker's microhardness tester. Low dielectric loss shows that the grown crystal contains lesser defects authenticating the suitability of the crystal towards device applications. The surface morphology studies have been carried out on the grown crystal. © 2010 Elsevier B.V. All rights reserved.


Uthrakumar R.,Loyola College | Vesta C.,SDNB Vaishnav College | Jose M.,Loyola College | Sugandhi K.,Loyola College | And 2 more authors.
Physica B: Condensed Matter | Year: 2010

The unidirectional crystal growth technique has been employed for the bulk growth of semi-organic nonlinear optical barium bis-para-nitrophenolate para-nitrophenol tetra hydrate single crystals along the (2 2 0) direction with almost high solutecrystal conversion efficiency. The grown crystal was subjected to single crystal and powder XRD analyses in order to confirm the crystal identity. Optical absorption studies reveal very high transmittance in the entire visible and near IR region. The presence of various functional groups is confirmed by FTIR analysis. Low dielectric loss at high frequency region is indicative of enhanced optical quality with lesser defects. Photoconductivity measurements carried out on the grown crystal reveal the negative photoconducting nature. © 2010 Elsevier B.V. All rights reserved.


Sumathi C.P.,SDNB Vaishnav College | Valli R.P.,Mother Teresa Women's University | Santhanam T.,DG Vaishnav College
European Journal of Scientific Research | Year: 2011

With the increasing number of Web users, Web-based organizations are keen to analyze the on-line browsing behavior of the users in their Web site and identify their interest immediately in a session. The analysis of the user's current interest based on the navigational behaviour may help the organizations to guide them in their browsing activity and provide recommendations in a shorter span of time. There are various approaches for recommendations but the selection of the recommendation approach is determined by the evaluation measures. This paper focuses on the evaluation measures of the recommendation systems to determine their "correctness" and "completeness". The experimental results performed on real usage data from a commercial Web site show a significant improvement in the recommendation effectiveness of the proposed system. © EuroJournals Publishing, Inc. 2011.


Sumathi C.P.,SDNB Vaishnav College | Padmaja Valli R.,Mother Teresa Women's University | Santhanam T.,DG Vaishnav College
Journal of Computer Science | Year: 2010

Problem statement: With the continued growth and proliferation of e-commerce, Web services and Web-based information systems, the volumes of click-stream and user data collected by Web-based organizations in their daily operations have reached astronomical proportions. Analyzing such data can help these organizations optimize the functionality of web-based applications and provide more personalized content to visitors. This type of analysis involved the automatic discovery of usage interest on the web pages which are often stored in web and applications server access logs. Approach: The usage interest on the web pages in various sessions was partitioned into clusters such that sessions with "similar" interest were placed in the same cluster using expectation maximization clustering technique as discussed in this study. Results: The approach results in the generation of usage profiles and automatic identification of user interest in each profile. Conclusion: The significance of the results will be helpful for organizations for web site improvement based on their navigational interest and provide recommendations for page(s) not yet visited by the user. © 2010 Science Publications.


Radha R.,Sdnb Vaishnav College | Lakshman B.,Bhaktavatsalam Memorial College for Women
Proceedings - 2014 World Congress on Computing and Communication Technologies, WCCCT 2014 | Year: 2014

This paper demonstrates a method for the detection and extraction of features like optic disc and macula from the retinal images. Digital fundus images are becoming popular for the diagnosis of ophthalmic pathologies. Due to this, there is an increasing possibility of applying digital image processing techniques and methods in these images to m the make the diagnosis more easier. In this paper first bit plane separation is done to the pre-processed retinal image. To carry the vital information of the location of optic disc and macula are found by bit plane 0 and bit plane 1. The exact boundary is identified by applying mathematical morphology. The proposed algorithm is simple and has been evaluated on the images collected from a reputed eye hospital. An accuracy of 91% was obtained in extracting the optic disc and macula from the retinal image. © 2014 IEEE.


Subramanian K.G.,Universiti Sains Malaysia | Hemalatha S.,Sdnb Vaishnav College | Venkat I.,Universiti Sains Malaysia
ACM International Conference Proceeding Series | Year: 2012

Motivated by Watson-Crick automata, we introduce here a grammar counterpart called a Watson-Crick regular grammar that has rules as in a regular grammar but involves double stranded strings. The language generated by this grammar consists of strings in the upper strands of the double stranded strings related by a complementarity relation. We obtain some properties of these grammars and also indicate an application to generation of chain code pictures. Copyright © 2012 ACM.


Suganya P.,Dwaraka Doss Goverdhan Doss Vaishnav College | Sumathi C.P.,SDNB Vaishnav College
2014 IEEE International Conference on Computational Intelligence and Computing Research, IEEE ICCIC 2014 | Year: 2015

This paper focuses on the functionalities of the various classifier rules in data mining. It presents an idea about how classifier rules are working over the given data sets. It also emancipates the variations induced by the classifier rules for obtaining the desired optimum classification. Classifier rules are the protocols which are implied over the data sets in order to obtain a highly comprehensive and accurate results. The two division of classification prediction are perfect and imperfect test. In perfect test the population or the elements of the dataset fall exactly into the target class whereas in imperfect test there are some errors in the prediction of the target class. Such perfect and imperfect tests are carried out by means of which classification rule assigns the elements of the training population set to any one of the classes. This enhances the users to get a classified output for any type of massive data which was provided as an input. © 2014 IEEE.


Hemalatha S.,Sdnb Vaishnav College | Revathi S.,Radha Nagar
Proceedings - 2011 6th International Conference on Bio-Inspired Computing: Theories and Applications, BIC-TA 2011 | Year: 2011

This paper deals with generation of twodimensional arrays and picture patterns using parallel insertion scheme introduced in [9] and Rewriting P systems with conditional communication [6]. Specifically Parallel insertion scheme is incorporated along with conditional communication and the resulting system is studied. © 2011 IEEE.


Meenakshisundaram K.,DG Vaishnav College | Santhanam T.,DG Vaishnav College | Saroja M.,Erode Arts and Science College | Sumathi C.P.,SDNB Vaishnav College
European Journal of Scientific Research | Year: 2010

Examination is an important tool in the field of education methodology. With regard to teaching - learning - evaluation process, the chief issue associated with the objective-type examination system is the administration of question paper setting. The lack of expertise and the time are the limitations identified while setting the objective type question papers. Redundancy may occur during retrieval of records from an objective type question bank. To solve this issue, a methodology is required to retrieve records from a database without redundancy. The task associated in generating the required collection of questions from a question bank, with minimal redundancy as far as possible in the retrieval of records from the question bank using mid-product and constant multiplier techniques for random number generation are discussed in this paper. A modified approach is identified and handled to generate random numbers and used to retrieve records from a database. The suggested approach performs reasonably better than the actual techniques reported in the literature even for retrieving records from a database of smaller size. © 2010 EuroJournals Publishing, Inc.

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