Time filter

Source Type

Kuppam, India

The Dravidian University , Kuppam, Chittoor district, Andhra Pradesh, India was established by the Government of Andhra Pradesh, through a Legislature Act with the initial support extended by the governments of Tamil Nadu, Karnataka and Kerala for an integrated development of Dravidian languages and culture.The university, which formally came into existence in 1997, began functioning with two departments in 1998 and has today grown into a strong institution of 20 academic departments and 6 research centres. Wikipedia.

Mann K.S.,Dravidian University | Singla J.,Singhania University | Kumar V.,Singhania University | Sidhu G.S.,G.S.S. School
Annals of Nuclear Energy | Year: 2012

To check the gamma ray shielding properties of selected low-Z building materials such as Soil-I, Soil-II, Dolomite, Gypsum, Igneous Rock and Lime Stone, some parameters of dosimetric interest have been investigated in the energy range 0.015-15 MeV. The photon interactions with the samples have been discussed mainly in terms of mass attenuation coefficient, equivalent atomic number and exposure buildup factor. From the present investigations, it has been concluded that the values of exposure buildup factors are very large in the medium energy region and Soil-I acts as best gamma ray shielding material among the selected samples. © 2012 Elsevier Ltd. All rights reserved. Source

Unnamalai K.,Dravidian University
Procedia Engineering | Year: 2012

Sentiment analysis determines the attitude of a speaker or a writer with respect to some topic or the overall contextual polarity of a document. The attitude may be his or her judgment or evaluation, affective state or the intended emotional communication. It is a common practice that merchants selling products on the Web ask their customers to review the products and associated services. As e-commerce is becoming more and more popular, the number of customer reviews that a product receives grows rapidly. For a popular product, the number of reviews can be in hundreds or even thousands. This paper describes the concepts of sentiment analysis from unstructured text, looking at why they is useful and what tools and techniques are available. We will describe a variety of general rule-based and machine learning techniques, which provides some background information on the key underlying NLP processes required, and focus specifically on some of the major problems and solutions, such as detection of sarcasm, use of informal language, spam opinion detection, trustworthiness of opinion holders, and so on. We will also discuss problems associated with opinion detection in social media such as blogs, forum posts, twitter, etc. The techniques will be demonstrated with key open-source tools and applications. © 2012 Published by Elsevier Ltd. Source

Mann K.S.,Dravidian University | Kurudirek M.,Ataturk University | Sidhu G.S.,G.S.S.S.
Applied Radiation and Isotopes | Year: 2012

Dosimetric materials have been investigated in terms of calculated mass energy absorption coefficient, equivalent atomic number and KERMA (kinetic energy released per unit mass) in the energy range 0.015-15. MeV. Using analytical methodology it has verified that nylon is the best substitute dosimetric material for skin, muscle, bone and soft-tissues. Relative energy absorption buildup factors calculated by G-P fitting method confirm the findings. Nylon has been found to be good tissue substitute material for making tissue-phantoms of the biological tissues investigated. © 2011 Elsevier Ltd. Source

Charles V.,Catholic University of Peru | Kumar M.,Catholic University of Peru | Irene Kavitha S.,Dravidian University
International Journal of Production Economics | Year: 2012

The printed circuit board (PCB) assembling production process is generally optimized to ensure very low levels of errors (defects) so as to produce the higher quality product. The evaluation of efficiency of different types of PCB (cards) could help the management in identifying the quality of assembly process to work out appropriate interventions to prevent failures. This study uses the technique of data envelopment analysis to assess the efficiency of cards across all assembly units as well as within its respective assembly unit in the presence of undesirable outputs under the assumption of weak disposability. In our case, the three types of errors, viz.; machine error, manual errors and other errors that occur in the defective assembled PCBs are considered as the undesirable outputs. In-depth analysis has been carried out through jackknifing analysis to check the robustness of DEA efficiency scores. The best practice group of cards for each inefficient card has been identified which eventually facilitate the management to derive the level of undesirable outputs to be reduced and desirable output to be improved so as to achieve the level of efficiency at par with its practice group. © 2011 Elsevier B.V. Source

Subramanian N.,Dravidian University | Sundaraganesan N.,Annamalai University | Jayabharathi J.,Annamalai University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2010

Quantum chemical calculations of energies, geometrical structure and vibrational wavenumbers of 1,2-bis(3-methoxy-4-hydroxybenzylidene)hydrazine [vanillin azine (VA)] were carried out by using density functional (DFT/B3LYP) method with 6-31G(d) as basis set. The optimized geometrical parameters obtained by DFT calculations are in good agreement with single crystal XRD data. The vibrational spectral data obtained from solid phase FT-IR and FT-Raman spectra are assigned based on the results of the theoretical calculations. The observed spectra are found to be in good agreement with calculated values. The electric dipole moment (μ) and the first hyperpolarizability (β) values of the investigated molecule have been computed using ab initio quantum mechanical calculations. The calculation results also show that the VA molecule might have microscopic nonlinear optical (NLO) behavior with non-zero values. A detailed interpretation of the infrared and Raman spectra of VA was also reported. The energy and oscillator strength calculated by time-dependent density functional theory (TD-DFT) results complements with the experimental findings. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. The theoretical NMR chemical shifts complement with experimentally measured ones. © 2010 Elsevier B.V. All rights reserved. Source

Discover hidden collaborations