NPR Arts and Science College

Dindigul, India

NPR Arts and Science College

Dindigul, India
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Karthikeyan K.,NPR Arts and Science College | Karthikeyani V.,Government of Tamilnadu
International Review on Computers and Software | Year: 2014

Ontologies play an important role in knowledge Management like annotating web resources, web mining and other internet related applications. Since the manual construction of a high quality ontologies are more expensive and take more time to complete the process. So, more number of automatic and semi-automatic ontologies is created in the system and also existing ontology learning provides the best results, but sometimes makes the failure due to process of noise in the text. Noise text is one of the major problems in the ontology learning. Because noise text are could not extracted. It makes the problem in completion of the extraction. For avoiding the noise in the data and providing the quick process, paper introduce the novel concept extraction method. This concept extraction presents an ontology building through the automatic and semiautomatic process. Most of the ontology learning technique developed using the Classifiers, NLP, probabilistic and statistical learning. For the concept extraction it uses the process of statistical learning with the combination of text. To increases the richness and avoid the issue of noise, this paper proposes the method of PROCEOL (Probabilistic Relational of Concept Extraction in Ontology Learning). An experimental result provides the best concept extractions compared to the state of the art method. © 2014 Praise Worthy Prize S.r.l. - All rights reserved.


Merciline Leonora J.,NPR Arts and Science College | John Peter A.,Kyung Hee University | Lee C.W.,Kyung Hee University
Solid State Communications | Year: 2012

The effect of longitudinal optical phonon field on the exciton in a Cd 1- xoutMn xoutTeCd 1- xinMn xinTeCd 1- xoutMn xoutTe strained quantum well is investigated using the AldrichBajaj effective potential. Spin polaronic shifts are estimated using mean field theory for different Mn concentration and the well sizes. A theoretical study of diluted magnetic semiconductors treating local sp-d exchange interaction J between the itinerant carriers and the Mn electrons is treated within a realistic band structure. The total optical absorption and the refractive index changes as a function of normalized photon energy in the presence of polaron and the Mn ion content are analyzed. Our results show that the occurred red shifts of the absorption resonant peak due to the polaron in CdMnTe give the information about the variation of two energy levels in the quantum well. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity, the polaronic effect and the Mn content. © 2011 Elsevier Ltd. All rights reserved.


Merciline Leonora J.,NPR Arts and Science College | Peter A.J.,Kyung Hee University | Yoo C.K.,Kyung Hee University
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2013

Binding energy of a confined exciton is investigated in a Cd 1-XoutMnXout Te/Cd1-Xin MnXin Te/Cd1-Xout MnXout Te diluted magnetic quantum well in the influence of electric field. Calculations are performed for various Mn incorporation in Cd1-xMnxTe material within a single band effective mass approximation using variational method. Spin polaronic shifts are estimated using mean field theory for different Mn concentration and the well sizes. A theoretical study of diluted magnetic semiconductors treating local sp-d exchange interaction J between the itinerant carriers and the Mn electrons is treated within a realistic band structure. The optical absorption and the refractive index changes as a function of normalized photon energy in the presence of electric field strength and the Mn ion content are analysed. Our results show that the occurred red shift of the absorption resonant peak due to the electric field gives the information about the variation of two energy levels in the quantum well. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity, the electric field strength and Mn content. © 2012 Elsevier B.V. All rights reserved.


Merciline Leonora J.,NPR Arts and Science College
Solid State Communications | Year: 2010

We investigate the effects of magnetic field strength over the ground state binding energy of a hydrogenic acceptor impurity confined in a Cd1 - xi n Mnxi n Te / Cd1 - xo u t Mnxo u t Te quantum well. We apply the variational method using 1s-hydrogenic wavefunction, in the framework of the single band effective mass approximation. The effect of valence band degeneracy is considered through the energy dependent effective mass. The magnetic field dependence of the barrier height is discussed. The band gap tuning in an external magnetic field for different compositions of Mn ions is achieved using an empirical formula. Spin polaronic shifts are estimated using mean field theory for different magnetic field strengths and the well sizes. We present a theoretical study of diluted magnetic semiconductors treating the local p-d exchange interaction J between the itinerant carriers and the Mn electrons within a realistic band structure. These results are compared with the other existing available literature. © 2009 Elsevier Ltd. All rights reserved.


The band offsets for a Zn 1-xinMg xinSe/Zn 1-xoutMg xout Se quantum well heterostructure are determined using the model solid theory. The heavy hole exciton binding energies are investigated with various Mg alloy contents. The effect of mismatch between the dielectric constants between the well and the barrier is taken into account. The dependence of the excitonic transition energies on the geometrical confinement and the Mg alloy is discussed. Non-linear optical properties are determined using the compact density matrix approach. The linear, third order non-linear optical absorption coefficient values and the refractive index changes of the exciton are calculated for different concentrations of magnesium. The results show that the occurred blue shifts of the resonant peak due to the Mg incorporation give the information about the variation of two energy levels in the quantum well width. © 2012 Chinese Institute of Electronics.


Leonora J.M.,NPR Arts and Science College | Yoo C.K.,Kyung Hee University
Journal of Computational and Theoretical Nanoscience | Year: 2012

Pressure induced binding energy of a confined exciton in a Cd 1-xoutMnxoutTe/Cd1-xinMnxinTe/ Cd1-xoutMnxoutTe diluted magnetic quantum well is investigated. Calculations are performed for various Mn incorporation into Cd1-x MnxTe material within a single band effective mass approximation using variational method. Spin polaronic shifts are estimated using mean field theory for different Mn concentration and the well sizes. A theoretical study of diluted magnetic semiconductors treating the local sp-d exchange interaction J between the itinerant carriers and the Mn electrons is treated within a realistic band structure. The total optical absorption and the refractive index changes as a function of normalized photon energy in the presence of pressure and the Mn ion content are analysed. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity and the pressure. The occurred blue shift of the resonant peak due to the pressure gives the information about the variation of two energy levels in the quantum well width. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity and the pressure and Mn content. Copyright © 2012 American Scientific Publishers. All rights reserved.


Leonora J.M.,NPR Arts and Science College
e-Journal of Surface Science and Nanotechnology | Year: 2012

Temperature dependence of the exciton in a Cd1xoutMnxoutTe/Cd1xinMnxinTe/ Cd1xoutMnxoutTe strained quantum well is investigated for various Mn content. Spin polaronic shifts are estimated using mean field theory for different Mn concentration and the well sizes. Calculations are performed for various Mn ion content in a Cd1xMnxTe material in which the strong built-in electric field due to piezoelectric polarizations are included. A theoretical study of diluted magnetic semiconductors treating local sp-d exchange interaction J between the itinerant carriers and the Mn electrons are treated within a realistic band structure. The temperature dependent optical absorption and the refractive index changes as a function of normalized photon energy with various Mn ion content are analyzed. Our results show that the occurred red shifts of the absorption resonant peak due to the effect of temperature give the information about the variation of two energy levels in the quantum well. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity, the temperature effect and the Mn content. © 2012 The Surface Science Society of Japan.


Hudson Mark J.A.,NPR Arts and Science College
AIP Conference Proceedings | Year: 2013

Dielectric confinement on exciton binding energy is investigated taking into account the geometrical confinement and the Mg incorporation in MgSe/Zn1-xMgxSe//MgSe quantum well. The effect of mismatch between the dielectric constants between the well and the barrier is considered throughout the problem. Changes of refractive index as a function of photon energy for various Mg composition in the quantum well are investigated with and without the inclusion of dielectric confinement. The result shows that the resonant peak moves towards the blue region when the Mg alloy content is increased. © 2013 American Institute of Physics.

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