Time filter

Source Type

Mamoon I.A.,Presidency University of Bangladesh | Islam A.K.M.M.,University of Technology Malaysia | Baharun S.,University of Technology Malaysia | Komaki S.,University of Technology Malaysia | Ahmed A.,Kyushu University
IEEE Region 10 Annual International Conference, Proceedings/TENCON | Year: 2017

Due to rapid growth of wireless medical devices, in near future wireless healthcare services may face some inescapable issues such as medical spectrum scarcity, electromagnetic interference (EMI) to bio-medical devices, bandwidth constrain, security and finally medical data transmission reliability, etc. To mitigate these issues, cognitive radio needs to be utilized and fine-tuned the upcoming wireless healthcare service system. Contemporary research on cognitive radio driven healthcare has shown some improvement on trimming the EMI, spectrum scarcity and bandwidth issues. However, a visible research gap and very limited guidelines are observed on medical data transmission reliability in a Cognitive Radio (CR) based healthcare. Thus this research designs an intelligent dynamic priority enabled queuing management based hospital traffic transmission mechanism for a previously proposed CR enabled hospital named CogMed. An equation is formulated to compute weight of a hospital traffic considering hospital location and priority of its device. The proposed priority mechanism intelligently determines the critical level of hospital data and decreases the rate of packet drop. Simulation results show that the critical emergency medical traffic obligates very low drop rate (1.56%), queuing time and network delay compared to other medical devices. The proposed system outperforms some the other traditional established methods for wireless data transmission system. © 2016 IEEE.

Taufique K.M.R.,Presidency University of Bangladesh | Shahriar F.M.,Leading University
International Journal of e-Business Research | Year: 2013

Few but mentionable studies have been conducted in typifying the Online Social Media (OSM) users. Studies on innovations taking place within the OSM environment are also very much found. But gaps are present in linking OSM innovations and adoption of innovations by the OSM users. Precise and objective studies to put the OSM users in an adoption spectrum are close to nil, though such studies might carry great significance in this new but exploding field of business and marketing. This study focuses on proposing an 'Adoption Spectrum' for OSM innovations by the users by proliferating Rogers's 'Adoption of Innovation' with the 'Typology of OSM Users'. Absolutely conceptual and qualitative in nature, the study concentrates on assessing the speed and magnitude of adoption of OSM innovations by the users. The proposed spectrum is an alignment between Rogers's work and the OSM user typology. Mentionable limitation of this piece of work may be forwarding the empirical justifications for further study. However, the study may be used as input for managing innovations by the firms that venture through OSM. Copyright © 2013, IGI Global.

Quayyum S.,Presidency University of Bangladesh | Nazmul I.M.,Presidency University of Bangladesh | Iasmin M.M.,Presidency University of Bangladesh | Amanat K.M.,Bangladesh University of Engineering and Technology
International Journal of Structural Stability and Dynamics | Year: 2010

Reinforced concrete (RC) frames with an open ground floor and various infill distributions have been analyzed for seismic loadings by the finite element method. The infills have been modeled by diagonal struts. Focus is placed on the effects of infill distribution on various structural responses, including (i) the lateral deflection, (ii) the column axial forces, (iii) the column bending moments, (iv) the base shear, and (v) the natural period of the frame. The equivalent static force method (ESFM) and response spectrum method (RSM) for linear structures have been applied, and the results obtained have been compared. It was found that the structural responses do not change appreciably by the ESFM analysis for random infill distributions, while they increase noticeably in the RSM analysis. This manifests the inadequacy of using the ESFM for general purposes, for which modifications were proposed in this paper for the design of RC columns. As the natural period of the RC frame converges with the code equations only for higher amounts of infill, it is necessary to incorporate the amount and distribution of infill in the dynamic analysis of RC frames. © 2010 World Scientific Publishing Company.

Abdul Jalil M.,Presidency University of Bangladesh | Masum S.M.,University of Dhaka
Tetrahedron Letters | Year: 2012

A general and efficient method for the preparation of biologically important imidazolyl alcohols via ring-opening of epoxides with N-silylated imidazole catalyzed by LiBr under solvent-free conditions is reported. © 2012 Elsevier Ltd. All rights reserved.

Chakraborty T.K.,Presidency University of Bangladesh
International Journal of Power Electronics and Drive Systems | Year: 2016

This paper concerns the experimental investigations of the three-phase line commutated SCR inverter fed synchronous motor. The fabricated system consists of a line-commuted inverter, a three-phase synchronous motor with the excitation winding connected in series to the inverter input, a terminal voltage sensor and a gate-pulse generating circuit. The firing pulses for SCRs of the inverter are generated by the microprocessor in proper sequence with the help of synchronizing signal derived from the terminal voltages of the synchronous machine. The steady state performance characteristics are obtained experimentally using the fabricated system. The experimental results show that a three-phase synchronous motor supplied by a line commutated inverter with the excitation winding connected in series to the dc link provide excellent characteristics of the conventional dc series motor. © 2016 Institute of Advanced Engineering and Science. All rights reserved.

Bhuyan M.H.,Bangladesh University of Engineering and Technology | Bhuyan M.H.,Presidency University of Bangladesh | Mohammedy F.M.,Bangladesh University of Engineering and Technology | Mohammedy F.M.,Presidency University of Bangladesh | And 2 more authors.
World Academy of Science, Engineering and Technology | Year: 2011

This paper presents the doping profile measurement and characterization technique for the pocket implanted nano scale n-MOSFET. Scanning capacitance microscopy and atomic force microscopy have been used to image the extent of lateral dopant diffusion in MOS structures. The data are capacitance vs. voltage measurements made on a nano scale device. The technique is nondestructive when imaging uncleaved samples. Experimental data from the published literature are presented here on actual, cleaved device structures which clearly indicate the two-dimensional dopant profile in terms of a spatially varying modulated capacitance signal. Firstorder deconvolution indicates the technique has much promise for the quantitative characterization of lateral dopant profiles. The pocket profile is modeled assuming the linear pocket profiles at the source and drain edges. From the model, the effective doping concentration is found to use in modeling and simulation results of the various parameters of the pocket implanted nano scale n-MOSFET. The potential of the technique to characterize important device related phenomena on a local scale is also discussed.

Bhuyan M.H.,Bangladesh University of Engineering and Technology | Bhuyan M.H.,Presidency University of Bangladesh | Khosru Q.D.M.,Bangladesh University of Engineering and Technology
World Academy of Science, Engineering and Technology | Year: 2011

Carriers scattering in the inversion channel of n- MOSFET dominates the drain current. This paper presents an effective electron mobility model for the pocket implanted nano scale n-MOSFET. The model is developed by using two linear pocket profiles at the source and drain edges. The channel is divided into three regions at source, drain and central part of the channel region. The total number of inversion layer charges is found for these three regions by numerical integration from source to drain ends and the number of depletion layer charges is found by using the effective doping concentration including pocket doping effects. These two charges are then used to find the effective normal electric field, which is used to find the effective mobility model incorporating the three scattering mechanisms, such as, Coulomb, phonon and surface roughness scatterings as well as the ballistic phenomena for the pocket implanted nano-scale n-MOSFET. The simulation results show that the derived mobility model produces the same results as found in the literatures.

Nazmul I.M.,Presidency University of Bangladesh | Matsumoto T.,Hokkaido University
International Journal of Solids and Structures | Year: 2012

A new mathematical procedure has been proposed for the determination of crack bridging stresses from perturbed crack opening displacements (COD) in fiber composites. The problem is an ill-posed inverse problem and the proposed procedure exploited concepts from functional analysis and the theory of inverse problems. The transformation from crack bridging stress into COD has been linearized, where the continuous crack bridging stresses functions of infinite dimensional vector spaces were approximated into finite dimensional subspaces. The coordinate representation of functions and the matrix of the transformation facilitated a numerical solution to the inverse problem. Self consistent direct and inverse problems were solved numerically in context to an example. Results establish that the proposed mathematical procedure produces fairly accurate results for engineering application. © 2011 Elsevier Ltd. All rights reserved.

Hoque Md.M.,Presidency University of Bangladesh | Alam Md.M.,Khulna University
Procedia Engineering | Year: 2013

Numerical study is performed to investigate the Magnetohydrodynamics fluid flow through a curved pipe with circular cross-section under various conditions. Spectral method is applied as a main tool for the numerical technique; where, Fourier series, Chebyshev polynomials, Collocation methods, and Iteration method are used as secondary tools. The Magnetohydrodynamics incompressible viscous steady flow through a curved pipe with circular cross-section is investigated numerically to examine the combined effects of high Dean Number Dn, magnetic parameter Mg and non- dimensional curvature δ The flow patterns have been shown graphically for large Dean Numbers as well as magnetic parameter and a wide range of curvatures 0.01 ≤ δ ≤ 0.4 .Two vortex solutions have been found. Axial velocity has been found to increase with the increase of Dean Number and decrease with the increase of curvature and magnetic parameter. For high magnetic parameter, Dean Number and low curvature almost all the fluid particles strength are weak. © 2013 The Authors. Published by Elsevier Ltd.

Loading Presidency University of Bangladesh collaborators
Loading Presidency University of Bangladesh collaborators