Jaypee Institute of Information Technology

About: Jaypee Institute of Information Technology is a education organization based out in Noida, Uttar Pradesh, India. It is known for research contribution in the topics: Computer science & Cluster analysis. The organization has 2136 authors who have published 3435 publications receiving 31458 citations. The organization is also known as: JIIT Noida.

A New Modified Dropping Function for Congested AQM Networks

Abstract: Active queue management schemes are used to reduce the number of dropped packets at the routers. Random early detection uses dropping probability which is calculated based on the average queue size. Further it is modified according to the value of the count indicating the number of unmarked packets that have arrived after a marked packet. The impact of random variable i.e. number of packets arrived after a marked packet over the dropping pattern is investigated. The proposed model achieves smooth dropping pattern which results in improvement of quality of service parameters. A new model for dropping probability is proposed with different dropping function. The effect of new dropping probability results in the increase of the throughput and reduction of the expected end-to-end delay. An important finding is that the choice of modified dropping function significantly affects the performance measures of the networks.

Effect of annealing temperature on the electrical characteristics of Platinum/4H-SiC Schottky barrier diodes

Abstract: Pt/4H-SiC Schottky barrier diodes have been fabricated to investigate the effect of annealing on the electrical characteristics of the fabricated devices. The parameters such as barrier height, ideality factor and donor concentration were deduced from the current–voltage (I–V) and the capacitance–voltage (C–V) measurements at room temperature. Diodes showed non-ideal behaviour like high value of ideality factor and lower value of barrier height. A barrier height of 1.82 eV was obtained from C–V measurements and it was 1.07 eV when obtained from the I–V measurements with ideality factor 1.71 for as-deposited diodes at room temperature. The diodes, therefore, were annealed in the temperature range from 25°C to 400°C to observe the effect of annealing temperature on these parameters. Schottky barrier height and ideality factors were found to be temperature-dependent. After rapid thermal annealing upto 400°C, a barrier height of 1.59 eV from C–V measurements and the value of 1.40 eV from I–V measurements with...

Torsional wave propagation in non-homogeneous layer between non-homogeneous half-spaces

Abstract: SUMMARY The study of surface wave in a layered medium has their possible application in geophysical prospecting. In the present work, dispersion equation for torsional wave in an inhomogeneous isotropic layer between inhomogeneous isotropic half-spaces has been derived. Two cases are discussed separately for torsional wave propagation in inhomogeneous layer between homogeneous and non-homogeneous half-spaces, respectively. Further, two possible modes for torsional wave propagation are obtained in case of inhomogeneous layer sandwiched between non-homogeneous half-spaces. Closed form solutions for displacement in the layer and half-spaces are obtained in each case. The study reveals that the layer width, layer inhomogeneity, frequency of inhomogeneity, as well as inhomogeneity in the half-space has significant effect on the propagation of torsional surface waves. Displacement and implicit dispersion equation for torsional wave velocities are expressed in terms of Heun functions and their derivatives. Effects of inhomogeneity on torsional wave velocity are also discussed graphically by plotting the dimensionless phase velocity against dimensionless and scaled wave number for different values of inhomogeneity parameter. Copyright © 2012 John Wiley & Sons, Ltd.

A wrenched-square shaped polarization independent and wide angle stable ultra-thin metamaterial absorber for S-band, X-band and Ku-band applications

Abstract: In this paper, a miniaturized quad-band polarization independent metamaterial loaded ultra-thin absorber is presented The structure of the proposed absorber designed such that one resonator provides three absorption bands independently albeit another resonator contributes in two absorption bands further combination of mentioned resonators provides four absorption bands As a result of this proposed metamaterial absorber exhibits four distinct absorption bands with peak absorptivity of 9575%, 9593%, 9769%, and 9564% at 32, 532, 1115, and 1673 GHz, respectively The simulated full width at half maximum (FWHM) bandwidths are found as 90 MHz (315–324 GHz), 220 MHz (521–543 GHz), 410 MHz (1094–1135 GHz), and 700 MHz (1638–1708 GHz) correspondingly Moreover, the designed absorber structure is ultra-thin with a thickness of 001 λ0 and unit cell is miniaturized with electrical size of 011 λ0 × 011 λ0 corresponding to free-space wavelength (λ0) calculated at lowest absorption frequency The metamaterial characteristic of proposed unit cell has been validated by discussing complex dielectric permittivity, magnetic permeability and dispersion diagrams Owing to the four-fold symmetry of absorber unit cell structure, it shows polarization insensitive behavior The proposed ultra-thin absorber can be applied in various applications like stealth technology, imaging, electromagnetic interference suppression, sensing, and wireless applications

Secure quantum communication with orthogonal states

Abstract: In majority of protocols of secure quantum communication (such as, BB84, B92, etc.), the unconditional security of the protocols are obtained by using conjugate coding (two or more mutually unbiased bases (MUBs)). Initially, all the conjugate-coding-based protocols of secure quantum communication were restricted to quantum key distribution (QKD), but later on they were extended to other cryptographic tasks (such as, secure direct quantum communication and quantum key agreement). In contrast to the conjugate-coding-based protocols, a few completely orthogonal-state-based protocols of unconditionally secure QKD (such as, Goldenberg–Vaidman and N09) were also proposed. However, till the recent past, orthogonal-state-based protocols were only a theoretical concept and were limited to QKD. Only recently, orthogonal-state-based protocols of QKD are experimentally realized and extended to cryptographic tasks beyond QKD. This paper aims to briefly review the orthogonal-state-based protocols of secure quantum communication that are recently introduced by our group and other researchers.