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Search Results: 1 - 10 of 173686 matches for " Debashis De "
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Symmetric Key based Audio Steganography for Mobile Network
Anwesha Mukherjee,Debashis De
International Journal of Engineering Innovations and Research , 2012,
Abstract: This paper presents an innovative Symmetric Key based Audio Steganography algorithms for providing security in mobile network. In this paper the data to be transmitted is encrypted using proposed symmetric key cryptography algorithm. The encrypted text is hidden within an audio file during transmission. Fibonacci series based bit replacement technique is used for the purpose of hiding the data. The audio and the data file are converted into stream of bits. Encryption is performed to convert the plain text to cipher text using the proposed symmetric algorithm using 128-bit key. The bits of the cipher text to be replaced are selected based on Fibonacci series. The time complexity of the proposed algorithm is 75 0less than the previous approach
Data Aggregation Techniques in Wireless Sensor Network: A Survey
Anindita Ray,Debashis De
International Journal of Engineering Innovations and Research , 2012,
Abstract: Data aggregation is essential for the efficient operation of wireless sensor network. Data aggregation has been widely recognized as an efficient method to reduce energy consumption by reducing the number of packets sent. In this paper a comprehensive review of the existing data aggregation techniques in wireless sensor network have been presented. Suitable criterias have been defined to classify existing solutions. In this paper several open issues have been identified and discussed which propose directions for future research in this area.
Analysis of Security Threats in Wireless Sensor Network
Sahabul Alam,Debashis De
Computer Science , 2014, DOI: 10.5121/ijwmn.2014.6204
Abstract: Wireless Sensor Network(WSN) is an emerging technology and explored field of researchers worldwide in the past few years, so does the need for effective security mechanisms. The sensing technology combined with processing power and wireless communication makes it lucrative for being exploited in abundance in future. The inclusion of wireless communication technology also incurs various types of security threats due to unattended installation of sensor nodes as sensor networks may interact with sensitive data and /or operate in hostile unattended environments. These security concerns be addressed from the beginning of the system design. The intent of this paper is to investigate the security related issues in wireless sensor networks. In this paper we have explored general security threats in wireless sensor network with extensive study.
Simple theoretical analysis of the photoemission from quantum confined effective mass superlattices of optoelectronic materials
Debashis De,Sitangshu Bhattacharya,S. M. Adhikari,A. Kumar
Beilstein Journal of Nanotechnology , 2011, DOI: 10.3762/bjnano.2.40
Abstract: The photoemission from quantum wires and dots of effective mass superlattices of optoelectronic materials was investigated on the basis of newly formulated electron energy spectra, in the presence of external light waves, which controls the transport properties of ultra-small electronic devices under intense radiation. The effect of magnetic quantization on the photoemission from the aforementioned superlattices, together with quantum well superlattices under magnetic quantization, has also been investigated in this regard. It appears, taking HgTe/Hg1 xCdxTe and InxGa1 xAs/InP effective mass superlattices, that the photoemission from these quantized structures is enhanced with increasing photon energy in quantized steps and shows oscillatory dependences with the increasing carrier concentration. In addition, the photoemission decreases with increasing light intensity and wavelength as well as with increasing thickness exhibiting oscillatory spikes. The strong dependence of the photoemission on the light intensity reflects the direct signature of light waves on the carrier energy spectra. The content of this paper finds six different applications in the fields of low dimensional systems in general.
La2O3 Catalyzed Oxidation of Alcohols  [PDF]
Ravikumar R. Gowda, Debashis Chakraborty
International Journal of Organic Chemistry (IJOC) , 2011, DOI: 10.4236/ijoc.2011.12008
Abstract: A variety of aromatic, aliphatic and conjugated alcohols were transformed to the corresponding carboxylic acids and ketones with a quantitative conversion in high yields with 70% t-BuOOH solution is water in the presence of catalytic amounts of La2O3. This method possesses a wide range of capabilities since it can be used with other functional groups which may not tolerate oxidative conditions, involves fairly simple method for work-up, exhibits chemoselectivity and proceeds under ambient conditions. The resulting products are obtained in good yields within reasonable time.
Notes on a singular Landau-Ginzburg family
Debashis Ghoshal
Physics , 1995, DOI: 10.1016/0370-2693(96)00538-2
Abstract: We study some properties of a singular Landau-Ginzburg family characterized by the multi-variable superpotential $W=-X^{-1}(Y_1Y_2)^{n-1} + {1\over n} (Y_1Y_2)^n - Y_3Y_4$. We will argue that (the infra-red limit of) this theory describes the topological degrees of freedom of the $c=1$ string compactified at $n$ times the self-dual radius. We also briefly comment on the possible realization of these line singularities as singularities of Calabi-Yau manifolds.
Fisher Equation for a Decaying Brane
Debashis Ghoshal
Physics , 2011, DOI: 10.1007/JHEP12(2011)015
Abstract: We consider the inhomogeneous decay of an unstable D-brane. The dynamical equation that describes this process (in light-cone time) is a variant of the non-linear reaction-diffusion equation that first made its appearance in the pioneering work of (Luther and) Fisher and appears in a variety of natural phenomena.
Normalization of the Boundary Superstring Field Theory Action
Debashis Ghoshal
Physics , 2001,
Abstract: The normalization of the boundary superstring field theory action is determined by computing the near on-shell amplitude involving three gauge fields.
Estimating Temperature Fluctuations in the Early Universe
Debashis Gangopadhyay
Physics , 2009, DOI: 10.1134/S0202289310030072
Abstract: A lagrangian for the $k-$ essence field is constructed for a constant scalar potential and its form determined when the scale factor was very small compared to the present epoch but very large compared to the inflationary epoch. This means that one is already in an expanding and flat universe. The form is similar to that of an oscillator with time-dependent frequency. Expansion is naturally built into the theory with the existence of growing classical solutions of the scale factor. The formalism allows one to estimate fluctuations of the temperature of the background radiation in these early stages (compared to the present epoch) of the universe. If the temperature at time $t_{a}$ is $T_{a}$ and at time $t_{b}$ the temperature is $T_{b}$ ($t_{b}>t_{a}$), then for small times, the probability for the logarithm of inverse temperature evolution can be estimated to be given by $$P(b,a)= |\langle ln~({1\over T_{b}}),t_{b}| ln~({1\over T_{a}}),t_{a}\rangle|^{2}$$ $$\approx\biggl({3m_{\mathrm Pl}^{2}\over \pi^{2} (t_{b}-t_{a})^{3}}\biggr) (ln~ T_{a})^{2}(ln~T_{b})^{2}\biggl(1 - 3\gamma (t_{a} + t_{b})\biggr)$$ where $0<\gamma<1$, $m_{\mathrm Pl}$ is the Planck mass and Planck's constant and the speed of light has been put equal to unity. There is the further possibility that a single scalar field may suffice for an inflationary scenario as well as the dark matter and dark energy realms.
The CNOT Quantum Logic Gate Using q-Deformed Oscillators
Debashis Gangopadhyay
Physics , 2006,
Abstract: It is shown that the two qubit CNOT (controlled NOT) gate can also be realised using q-deformed angular momentum states via the Jordan-Schwinger mechanism.Thus all the three gates necessary for universality i.e. Hadamard, Phase Shift and the two qubit CNOT gate are realisable with q-deformed oscillators.
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