Russian-Armenian (Slavonic) State University
Yerevan, Armenia
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Khachatryan G.,American University of Armenia | Hovsepyan M.,Russian-Armenian (Slavonic) State University | Jivanyan A.,American University of Armenia
Meeting Security Challenges Through Data Analytics and Decision Support | Year: 2016

In this paper, we describe a new protocol for secure evaluation of Deterministic Finite Automata (DFA) between two parities (client and server). The protocol has no restrictions on the DFA's input alphabet and runs in a single client-server communication round. It uses (mn) operations for client-side computations, O(mn|Q|) operations for server-side computations, and the network communication bandwidth is O(mnk|Q|) bytes where k is the security parameter of the protocol, m is the size of the DFA's input alphabet, n is the length of the input text and |Q| is the number of the DFA states. As a building block our algorithm uses the white-box based 1-out-of-n oblivious transfer protocol, which results that the protocol does no public-key operations. Apart from the description of the protocol, the paper also contains results of efficiency benchmarks done on our implementation of the protocol. © 2016 The authors and IOS Press. All rights reserved.

Petrosyan S.G.,Russian-Armenian (Slavonic) State University | Khanbekyan A.M.,Armenian National Academy of Sciences
Journal of Contemporary Physics | Year: 2017

The photocurrent induced by the local excitation of the light beam focused up to 0.17 μm on the surface of a semiconductor element in the planar structure with two p–n junctions, that is, with the use of the so-called scanning laser microscopy technique, has been studied experimentally. The linear dependence of the photocurrent on the coordinate of the beam center is obtained. The high sensitivity of the structure enables to detect the displacement of the order of tens nanometers. © 2017, Allerton Press, Inc.

Liang S.,Guangzhou University | Xie W.,Guangzhou University | Sarkisyan H.A.,Russian-Armenian (Slavonic) State University | Sarkisyan H.A.,Yerevan State University | And 2 more authors.
Superlattices and Microstructures | Year: 2012

Optical properties of a nanoring with Winternitz-Smorodinsky confinement potential in the presence of an external magnetic field have been studied theoretically. Our results demonstrate that energy, oscillator strength and the linear, nonlinear and total absorption are strongly affected by size of the nanoring. Also, we found that magnetic field has little influence on energy difference, oscillator strength and optical absorption of the nanoring. © 2012 Elsevier Ltd. All rights reserved.

Liang S.,Guangzhou University | Xie W.,Guangzhou University | Sarkisyan H.A.,Russian-Armenian (Slavonic) State University | Sarkisyan H.A.,Yerevan State University | And 2 more authors.
Journal of Physics Condensed Matter | Year: 2011

We have studied the nonlinear optical absorption and the nonlinear optical rectification of an exciton in a nanoring in the presence of magnetic flux. The calculation results show that one can control the properties of nonlinear optical absorption and nonlinear optical rectification of a nanoring by tuning the outer and inner radius. Moreover, we find that the nonlinear optical properties of a nanoring can be modulated by the magnetic flux through the nanoring. © 2011 IOP Publishing Ltd.

Melikyan A.,Russian-Armenian (Slavonic) State University | Minassian H.,A Alikhanian National Scientific Laboratory | Grigoryan V.G.,Saarland University | Springborg M.,Saarland University
Applied Physics B: Lasers and Optics | Year: 2013

We develop an analytical approach to calculate the aspect ratios of free alkali metal clusters using measured surface plasmon frequencies. The method is based on the concept of small deviations from a spherical shape and can be applied to clusters with spheroidal, icosahedral and other shapes. Results of experimental data as well as of numerical calculations for the surface plasmon resonance frequencies in small spheroidal sodium clusters containing less than 50 atoms are reproduced accurately through a quite simple formula which links the aspect ratio of the cluster to the observable surface plasmon frequencies. The developed approach allows also to reveal the dependence of the dielectric function of alkali metal on the number of atoms in the cluster. © 2013 Springer-Verlag Berlin Heidelberg.

Madoyan K.,Russian-Armenian (Slavonic) State University | Melikyan A.,Russian-Armenian (Slavonic) State University | Minassian H.,Yerevan Physics Institute
Applied Physics B: Lasers and Optics | Year: 2010

We develop a new method based on the continuous-fraction approach as applied to the electrostatic boundary problem for determining surface plasmon resonances of coupled nanospheres. The resonance frequency dependence on interparticle gap (plasmon nanoruler effect) is determined by avoiding time-consuming numerical calculations even for very small interparticle separations, where known procedures face serious difficulties. Corrections due to retardation effects are accounted for, allowing description of larger nanopairs. Good agreement is demonstrated both with results of numerical calculations and with experimental data. © Springer-Verlag 2010.

Petrosyan L.S.,Jackson State University | Petrosyan L.S.,Russian-Armenian (Slavonic) State University | Shahbazyan T.V.,Jackson State University
Physical Review B - Condensed Matter and Materials Physics | Year: 2015

We study resonant tunneling through a periodic square array of quantum dots sandwiched between modulation-doped quantum wells. If a magnetic field is applied parallel to the quantum dot plane, the tunneling current exhibits a highly complex Aharonov-Bohm oscillation pattern due to the interference of multiple pathways traversed by a tunneling electron. Individual pathways associated with conductance beats can be enumerated by sweeping the magnetic field at various tilt angles. Remarkably, Aharonov-Bohm oscillations are aperiodic unless the magnetic field slope relative to the quantum dot lattice axes is a rational number. © 2015 American Physical Society.

Petrosyan L.S.,Yerevan State Medical University | Petrosyan L.S.,Russian-Armenian (Slavonic) State University
Journal of Physics: Conference Series | Year: 2016

We study coherent transport in a system of periodic linear chain of quantum dots situated between two parallel quantum wires. We show that the resonant-tunneling conductance between the wires exhibits a Rabi splitting of the resonance peak as a function of Fermi energy in the wires. This effect is an electron transport analogue of the Rabi splitting in optical spectra of two interacting systems. The conductance peak splitting originates from the anticrossing of Bloch bands in a periodic system that is caused by a strong coupling between the electron states in the quantum dot chain and quantum wires.

Gasparyan V.A.,Russian-Armenian (Slavonic) State University
Advanced Materials Research | Year: 2013

In the effective-mass approximation the single-electron states in a direct-band CdS/β -HgS/CdS nanocylindrical heterolayer in the presence of strong lateral radial electrostatic field are considered. The explicit forms of the energy spectrum and envelope wave functions of singleparticle states for charge carriers are obtained using variation approach. Corresponding absorption characteristics of interband optical transitions in the layer in the presence of strong radial field are calculated. © (2013) Trans Tech Publications, Switzerland.

Hakobyan D.,Institute of Molecular Biology | Nazaryan K.,Institute of Molecular Biology | Nazaryan K.,Russian-Armenian (Slavonic) State University
Proteins: Structure, Function and Bioinformatics | Year: 2010

Phosphoglycerate mutase (PGM) and enolase are consecutive enzymes in the glycolytic pathway. We used molecular dynamics simulation to examine the interaction of human B-type PGM (dPGM-B) and neuron-specific enolase (NSE). Specifically, we studied the interactions of 31 orientations of these enzymes by means of the effective energy function implicit solvation method. Interactions between active regions of the enzymes occurred preferentially, although the strongest interactions appeared to be between the back side of NSE and the active regions of dPGM-B. Cleavage of 2PG from dPGM-B was investigated, and the Ser 14Leu 30 loop of dPGM-B is suggested as a cleavage site and, likely, another entrance site of a ligand. Substrate channeling between the enzymes was observed when NSE with its active regions Leu 11-Asn 16, Arg 49-Lys 59, and Gly 155-Ala 158 covered the Ser 14-Leu 30 loop of dPGM-B. Analyses of the results make us believe that the channeling between PGM and enolase "benefits" from weak interaction. The probability of formation of channeling favorable complex is estimated to be up to 5%, while functional interaction between NSE and dPGM-B might be as high as 20%. NSE and dPGM-B functional interaction seems not to be isotype specific. © 2010 Wiley-Liss, Inc.

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