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Nuka M.R.,Annamacharya Institute of Technology and science Autonomous | Naidu M.M.,Gudlavalleru Engineering College
International Journal of Wireless and Mobile Computing | Year: 2014

The throughput of a Global System for Mobile Communications (GSM) network is to be maximised for effectively and efficiently meeting the service requirements of the everincreasing mobile subscriber base. The period of temporary storage of subscribers' profiles in the Visitor Location Register (VLR) at a Mobile Switching Centre (MSC) affects the throughput of a GSM network. This research study proposes a sliding window method for determining the storage period of profiles in the VLR, and the principle of optimisation for such a policy is to maximise the throughput and minimise the call set-up time in a GSM network. Copyright © 2014 Inderscience Enterprises Ltd. Source


Raju M.C.,Annamacharya Institute of Technology and science Autonomous | Varma S.V.K.,A.P.S. University | Seshaiah B.,P.A. College
Ain Shams Engineering Journal | Year: 2014

A theoretical analysis is performed to study induced magnetic field effects on free convection flow past a vertical plate. The x¯-axis is taken vertically upwards along the plate, y¯-axis normal to the plate into the fluid region. It is assumed that the plate is electrically non-conducting and the applied magnetic field is of uniform strength (H0) and perpendicular to the plate. The magnetic Reynolds number of the flow is not taken to be small enough so that the induced magnetic field is taken into account. The coupled nonlinear partial differential equations are solved by Perturbation technique and the effects of various physical parameters on velocity, temperature, and induced magnetic fields are studied through graphs and tables. Variations in Skin friction and rate of heat transfer are also studied. It is observed that an increase in magnetic parameter decreases the velocity for both water and air. It is also seen that there is a fall in induced magnetic field as magnetic Prandtl number, and magnetic field parameter increase. © 2014 Production and hosting by Elsevier B.V. on behalf of Ain Shams University. Source


Nuka M.R.,Annamacharya Institute of Technology and science Autonomous | Naidu M.M.,Andhra University
International Journal of Mobile Network Design and Innovation | Year: 2013

The throughput of a global system for mobile (GSM) communications network is to be maximised for meeting effectively and efficiently the service requirements of ever increasing mobile subscriber's base. The period of temporary storage of subscribers' profiles in visitor location register (VLR) at a mobile switching centre (MSC) affects the throughput of GSM network. This research study proposes a sliding window method for determining the storage period of profiles in VLR that maximises the throughput of GSM network. The proposed method proves to be better than the existing set intersection method. © 2013 Inderscience Enterprises Ltd. Source


Chandra Reddy P.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous
Advances and Applications in Fluid Mechanics | Year: 2016

In this paper, we have analyzed the diffusion-thermo and thermal diffusion effects on MHD natural convection flow of Rivlin-Ericksen fluid past a semi-infinite vertical plate with constant mass flux numerically. The governing equations related to the problem are reduced to non-dimensional form and solved by using finite-difference method. The influences of several parameters on velocity, temperature and concentration are studied graphically. Variations in skin-friction and Nusselt number are also discussed with the help of tabular values. The temperature rises with increasing values of Df and decreasing values of So. The species concentration increases for increasing values of So, but a reverse effect is found in the case of Df. © 2016 Pushpa Publishing House, Allahabad, India. Source


Chandra Reddy P.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous
International Journal of Engineering Research in Africa | Year: 2016

This manuscript presents the diffusion thermo and thermo diffusion effects on unsteady MHD natural convection heat and mass transfer flow past an accelerated vertical porous plate in the presence of thermal radiation, variable temperature and also variable concentration. The nondimensional governing equations are solved numerically by using finite difference scheme. The effects of different physical parameters on velocity, temperature and concentration are presented and discussed with the help of graphs. Also the numerical values for local skin friction, Nusselt number and Sherwood number are recorded and analyzed. Increasing values of Soret number results in rising of the concentration, but it falls down under the influence of Dufour number and Schmidt number. Skin friction decreases for increasing values of both Soret and Dufour numbers. © (2016) Trans Tech Publications, Switzerland. Source

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