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Tulasidasu M.,DIET | Sirisha B.L.,VRSEC | Reddy K.R.,MRITS
Proceedings - 2015 International Conference on Computational Intelligence and Communication Networks, CICN 2015 | Year: 2015

Steganography is a manifestation of strategy through "indistinct quality". The science and speciality of concealing the presence of a message in the middle of sender and planned beneficiary. Steganography has been utilized to shroud mystery pictures in different sorts of documents, including computerized pictures, sound and feature. The three most essential parameters for Steganography are indistinctness, payload and heartiness. This paper presents a best approach for Least Significant Bit focused around picture Steganography that upgrades the current LSB substitution systems to enhance the security level of concealed data. All current strategies for Steganography concentrate on implanting technique with less concern to the pre-processing, for example, encryption of secret picture. In this work shrouded data is stored into distinctive position of LSB of picture utilizing block division procedure relying upon the secret key. Therefore it is hard to concentrate the concealed data knowing the recovery systems. We have used peak signal to noise ratio (PSNR) to measure the quality of stego pictures. The estimation of PSNR gives better come about in light of the fact that our proposed strategy changes little number of bits of the picture. © 2015 IEEE.


Singh U.,Guru Nanak Institutions | Kamal T.S.,DIET
IET Microwaves, Antennas and Propagation | Year: 2012

This study presents a novel optimisation algorithm biogeography-based optimisation (BBO) for thinning large multiple concentric circular ring arrays. The objective is to achieve an array of uniformly excited isotropic antennas that will generate a narrow beam with minimum relative sidelobe level (SLL). BBO is a new comprehensive force based on the science of biogeography. Biogeography is the schoolwork of geographical allotment of biological organisms. BBO utilises migration operator to share information between the problem solutions. The problem solutions are known as habitats and sharing of features is called migration. In this study, the authors propose pattern synthesis method to reduce the SLLs with narrow beamwidth (BW) by making the ring array thinned using the BBO algorithm. The thinning percentage of the array is kept equal to or more than 50% and the BW is kept equal to or less than that of a fully populated, uniformly excited and 0.5λ w, spaced concentric circular ring array of same number of elements and rings. The results obtained are compared with previous published results of modified particle swarm optimisation and differential evolution with global and local neighbourhoods. © 2012 The Institution of Engineering and Technology.


Singh U.,Guru Nanak Institutions | Kamal T.S.,DIET
IET Microwaves, Antennas and Propagation | Year: 2011

Biogeography-based optimisation (BBO) is employed for the optimisation of non-uniform circular antenna arrays. In BBO, the problem solutions are represented as islands and the sharing of features between solutions corresponds to immigration and emigration between the islands. The scheme of BBO is employed to find out an optimal set of weights and antenna element separations to provide a radiation pattern with maximum side lobe level (SLL) reduction with the constraint of a fixed major lobe beam width. The capability of BBO is demonstrated by taking different sizes of antennas. The results show that the design of non-uniform circular antenna arrays using the BBO algorithm offers a SLL reduction better than that obtained using genetic algorithms, particle swarm optimisation and simulated annealing.© 2011 The Institution of Engineering and Technology.


Bhatia K.S.,Rayat Bahra Institute of Engineering and Nano Technology | Kaler R.S.,Thapar University | Kamal T.S.,Diet | Randhawa R.,Punjabi University
Journal of Optical Communications | Year: 2012

This paper forces on the monitoring and compensation of optical telecommunication channels by using Optical add drop multiplexers (OADM) in an Optical orthogonal frequency division multiplexing (OOFDM) system. An adaptive fiber nonlinearity precompensation (AFNP) scheme is also proposed to solve the fiber nonlinearity in coherent optical orthogonal frequency division multiplexed networks (CO-OFDM). Optical performance monitoring (OPM) at end-terminals is applied to channel identification in this paper. It is considered to be high efficiency and a cost efficient technique in low-dynamic system. Copyright © 2012 De Gruyter.


Bhatia K.S.,Rayat Bahra Institute of Engineering and Nano Technology | Kaler R.S.,Thapar University | Kamal T.S.,DIET | Randhawa R.,Punjabi University
Optik | Year: 2013

In this paper, we first present the concept of adding and dropping the signals by using optical add drop multiplexers (OADMs) in an optical orthogonal frequency division multiplexing (OOFDM) system. We then demonstrated the transmission performance through simulation for Integrated Dense Wavelength Division Multiplexing and Optical-OFDM system with OADM including the fiber nonlinearity effect. The results show that system Q is about 18 dB for this system when operating at 9.953 Gb/s in standard-single-mode-fiber without dispersion compensation up to 4500 km distance. Signal evolution is also remarkable if system is operated at a frequency of 191.151 THz and Relative Intensity to Noise ratio (RIN) adjusted to -155 dB/Hz. © 2012 Elsevier GmbH. All rights reserved.


Felicita Vimala J.,DIET | Thomas Joseph Prakash J.,Bharathidasan University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

Single crystal of 2 mol% l-Proline doped Bis Thiourea Zinc Acetate (BTZA), a semi organic nonlinear optical material has been grown using slow evaporation technique. Good quality single crystal with dimension 11 × 7 × 3 mm3 was harvested after 30 days. The influence of amino acid l-Proline was studied for 1, 2 and 3 mol% l-Proline doped BTZA using Kurtz and Perry powder second harmonic generation test. This was compared with pure BTZA which confirms the enhancement of second harmonic generation property of l-Proline doped BTZA. Better enhancement was found in 2 mol% l-Proline doping. The grown crystal was characterized using single crystal X-ray diffraction, Fourier Transform Infra Red spectroscopy (FTIR) analysis, UV-Visible absorption and thermogravimetric analysis. © 2013 Elsevier B.V. All rights reserved.


Singh U.,GNDP College | Kumar H.,Sant Longowal Institute of Engineering And Technology | Kamal T.S.,DIET
Progress In Electromagnetics Research M | Year: 2010

This paper presents a novel optimization technique biogeography based optimization (BBO) for antenna array synthesis. BBO is a relatively new evolutionary global optimization technique based on the science of biogeography. It is capable of solving linear and non-linear problems. In this paper, BBO algorithm is used to determine an optimum set of amplitudes of antenna elements that provide a radiation pattern with maximum side lobe level reduction and/or null placement in the specified directions. The results obtained show the effectiveness of the BBO algorithm, and they are better than previous published results.


Singh U.,GNDP College | Kumar H.,Sant Longowal Institute of Engineering And Technology | Kamal T.S.,DIET
IEEE Transactions on Antennas and Propagation | Year: 2010

Biogeography based optimization (BBO) is a new inclusive vigor based on the science of biogeography. Biogeography is the schoolwork of geographical allotment of biological organisms. BBO employs migration operator to share information between the problem solutions. The problem solutions are identified as habitat and sharing of features is called migration. In this communication, BBO algorithm is matured to optimize the element length and spacing for Yagi-Uda antenna. The gain of Yagi-Uda is a multimodal function and is hard to optimize because of its reliance on changes in lengths and spacings. To confirm the capabilities of BBO, Yagi-Uda antenna is optimized for three different design objectives which include gain, input impedance and side lobe level (SLL). During optimization, NEC2a method of moment's code evaluates the performance of each design generated by BBO algorithm. The results obtained by BBO are compared with the genetic algorithm (GA), evolutionary programming (EP), comprehensive learning particle swarm optimization (CLPSO), simulated annealing (SA) and computational intelligence (CI). © 2010 IEEE.


Bhatia K.S.,Rayat Bahra Institute of Engineering and Nano Technology | Kamal T.S.,DIET
Journal of Optical Communications | Year: 2012

In this paper, we demonstrated the transmission performance through simulation for Integrated Dense Wavelength DivisionMultiplexing and Optical-OFDM system with OADM including the fiber nonlinearity effect. The effects on transmitted channels, fiber link length, operating optical signal wavelength, optical transmitted signal power, optical signal bandwidth, transmission bit rate, optical received power and bit error rate at the receiving side are observed. Copyright © 2012 De Gruyter.


Bhatia K.S.,Rayat Bahra Institute of Engineering and Nano Technology | Kamal T.S.,DIET
International Journal of Electronics and Telecommunications | Year: 2012

In this paper, we have carried out the simulative analysis for averaging out the optimal value of RIN for better performance in high bit rate optical transmission link. We have found that for single mode VCSEL, the bias of 2 mA has the highest Spurious Free Dynamic Range (SFDR) and low RIN. For multimode VCSEL, the bias of 6 mA has the highest SFDR and low RIN.

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