National University of Computer and Emerging Sciences

About: National University of Computer and Emerging Sciences is a education organization based out in Islamabad, Pakistan. It is known for research contribution in the topics: Computer science & The Internet. The organization has 1506 authors who have published 2438 publications receiving 26786 citations.

A novel solution procedure for fuzzy fractional heat equations by homotopy analysis transform method

Abstract: In this paper, we designed a reliable recipe of homotopy analysis method and Laplace decomposition method namely homotopy analysis transform method to solve fuzzy fractional heat and wave equations. This method overcomes the difficulties arise in other analytical method and removes the restrictive condition of nonlinearity and assumptions of small and large parameters.

On Chip Antenna Measurement: A Survey of Challenges and Recent Trends

Abstract: Exponential increase in the requirements of cost effective and highly compact wireless modules has put system-on-chip (SoC) technology in high demand. On-chip-antenna (OCA) is an integral component of SoC-based wireless communication systems and has emerged as a perfect candidate for plethora of promising applications, especially at millimeter wave and terahertz frequencies. OCAs also support compact and low power applications of wireless sensor networks and Internet-of-Things. Since OCAs are manufactured on a single substrate along with other components, therefore their successful realization is subject to several challenges; the most significant of which is their accurate measurement. OCA’s precise characterization is considered to be one of the toughest challenges to overcome since traditional off-chip antenna measurement setups are not suitable for this job. This calls for innovative measurement techniques, setups and solutions to enable their true characterization. Inspired by the significance of OCA characterization, this paper presents a comprehensive survey of the key recent developments in the field of OCA measurements. The techniques used to measure conventional off-chip antennas are briefly outlined followed by a succinct description of OCA’s characterization challenges. The most recent trends and techniques of OCA measurement are expansively compiled. Some avenues for future trends in this regards are also delineated. It is anticipated that the presentation of this review will inspire the research community to come up with the novel methods and proposals to facilitate the OCA characterization process.

Comparison of Hard-decision and Soft-decision channel coded M-ary PPM performance over Free Space Optical Links

Abstract: Error control coded M-ary pulse position modulation (PPM) can be used over free space optical links to mitigate the atmospheric attenuations and the turbulence induced fading. In this paper, we present performance analysis for coded free space optics (FSO) communication systems operating over various atmospheric conditions. We justify the selection of higher state PPM as an appropriate modulation scheme for the links and provide a comparative analysis between hard decision decoded (Reed-Solomon, RS) and soft decision decoded (Turbo) channel coded PPM over varying link conditions. Simulation results strongly indicate RS-coded PPM as a robust and well-performing coded-modulation scheme for the FSO links.

A mathematical study of natural convection flow through a channel with non-singular kernels: An application to transport phenomena

Abstract: In this manuscript, we have obtained closed form solution using Laplace transform, inversion algorithm and convolution theorem. The study of mass transfer flow of an incompressible fluid is carried out near vertical channel. Recently, new classes of differential operators have been introduced and recognized to be efficient in capturing processes following the decay law and the crossover behaviors. For the study of heat and mass transfer, we applied the newly differential operators say Atangana-Baleanu ( ABC ) and Caputo-Fabrizio ( CF ) to model such flow. This model for temperature, concentration and velocity gradient is presented in dimensionless form. The obtained solutions have been plotted for various values physical parameters like α , D f , G m , G r , S c and P r on temperature and velocity profile. Our results suggest that for the variation of time the velocity behavior for CF and ABC are reversible. Finally, an incremental value of prandtl number is observed for decrease in the velocity field which reflects the control of thickness of momentum and enlargement of thermal conductivity. Further, dynamical analysis of fluid with memory effect are efficient for ABC as compared to CF.

Emerging anisotropic compact stars in $$f(\mathcal {G},T)$$ f ( G , T ) gravity

Abstract: The possible emergence of compact stars has been investigated in the recently introduced modified Gauss–Bonnet $$f(\mathcal {G},T)$$ gravity, where $$\mathcal {G}$$ is the Gauss–Bonnet term and T is the trace of the energy-momentum tensor (Sharif and Ikram, Eur Phys J C 76:640, 2016) Specifically, for this modified $$f(\mathcal {G}, T)$$ theory, the analytic solutions of Krori and Barua have been applied to an anisotropic matter distribution To determine the unknown constants appearing in the Krori and Barua metric, the well-known three models of the compact stars, namely 4U1820-30, Her X-I, and SAX J 18084-3658 have been used The analysis of the physical behaviour of the compact stars has been presented and the physical features like energy density and pressure, energy conditions, static equilibrium, stability, measure of anisotropy, and regularity of the compact stars, have been discussed