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Search Results: 1 - 10 of 2767 matches for " Ashraf Hossain "
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Which One of Standardization or Customization Works the Best When It Comes to Online Marketing?  [PDF]
Ashraf Hossain, Rashad Yazdanifard
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.52006
Abstract: Online marketing has influenced the consumers all around the world. This opens up a way for the small enterprises to enter the international market and enjoy the benefits like the MNCs located in different parts of the world. Advertising products and manipulating the customers to buy is one of the techniques used by the international companies. As a result some companies take standardization as an incentive to attract customers while some use customization or personalization to manipulate them. This as a result that has created a debate between different marketers to choose a beneficial way to satisfy by attracting different customers. This article focuses on various problems which marketers face in terms of online retailing as well as different obstacles encountered by consumers while making buying decisions for standardized or customized products through online Medium (Internet).
On the Impact of Energy Dissipation Model on Characteristic Distance in Wireless Networks
Ashraf Hossain
Mathematics , 2011,
Abstract: In this paper we investigate the dependency of characteristic distance on energy dissipation model. Both the many-to-one and any-to-any communication paradigm have been presented for performance analysis. Characteristic distance has been derived for three different cases. This study will be useful for designing an energy-efficient wireless network where nodes are energy-constrained.
Sensing and Link Model for Wireless Sensor Network: Coverage and Connectivity Analysis
Ashraf Hossain,Rashmita Mishra
Mathematics , 2014,
Abstract: Coverage and connectivity both are important in wireless sensor network (WSN). Coverage means how well an area of interest is being monitored by the deployed network. It depends on sensing model that has been used to design the network model. Connectivity ensures the establishment of a wireless link between two nodes. A link model studies the connectivity between two nodes. The probability of establishing a wireless link between two nodes is a probabilistic phenomenon. The connectivity between two nodes plays an important role in the determination of network connectivity. In this paper, we investigate the impact of sensing model of nodes on the network coverage. Also, we investigate the dependency of the connectivity and coverage on the shadow fading parameters. It has been observed that shadowing effect reduces the network coverage while it enhances connectivity in a multi-hop wireless network.
Thermal Radiation Effects on Hydromagnetic Mixed Convection Flow along a Magnetized Vertical Porous Plate
Muhammad Ashraf,S. Asghar,Md. Anwar Hossain
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/686594
Abstract: Aim of the present work is to investigate the effect of radiation on steady mixed convection boundary layer flow of viscous, incompressible, electrically conducting fluid past a semi-infinite magnetized vertical porous plate with uniform transpiration and variable transverse magnetic field along the surface. The equations governing the flow magnetic and temperature field are reduced to dimensionless convenient form using the free variable transformations and solved numerically by using finite difference method. Effects of physical parameters like Prandtl number, Pr, the conduction-radiation parameter , magnetic field parameter , magnetic Prandtl number , mixed convection parameter , and the surface temperature, on the local skin friction coefficient , local Nusselt number, , and coefficient of magnetic intensity, against the local transpiration parameter are shown graphically. Later, the problem is analysed by using series solution for small and large values of , and the results near and away from the leading edge are compared with numerical results obtained by finite difference method and found to be in good agreement. 1. Introduction Thermal radiation effects on magnetohydrodynamics of an electrically conducting fluid flows are important in the context of space technology and processes involving high temperature. Physical interests of theses flows encountered in many engineering problems and industrial areas such as propulsion devices for missiles, aircraft, satellites, nuclear power plants, take place at high temperature and radiation effects play a significant role in designing them. One physical interest in this flow lies in the possibility of using such a field to shield a body from excessive heating and radiations. Here the literature survey is being started with the history of the work done by other authors along nonmagnetized, magnetized and then with porous surface and the radiation effects on these surface. Greenspan and Carrier [1] was the first who investigated the flow of viscous, incompressible and electrically conducting fluid in the presence of a symmetrically oriented semi-infinite flat plate in which magnetic field assumed to be coincident with the ambient fluid velocity field. In this investigation fourier transformation together with asymptotic analysis had been incorporated and found that the velocity gradient at the plate approaches zero due to increase in the applied magnetic field intensity. Further contributions to the problem was added by Davies [2, 3] considering the fact that the flow is opposed by magnetodynamic pressure
Fluctuating hydromagnetic natural convection flow past a magnetized vertical surface in the presence of thermal radiation
Ashraf Muhammad,Asghar Saleem,Hossain Anwar
Thermal Science , 2012, DOI: 10.2298/tsci110805045a
Abstract: The effect of radiation on fluctuating hydro-magnetic natural convection flow of viscous, incompressible, electrically conducting fluid past a magnetized vertical plate is studied; when the magnetic field and surface temperature oscillates in magnitude about a constant non zero mean. The numerical solutions have been obtained for different values of radiation parameter (Rd) magnetic Prandtl number (Pm) magnetic force parameter (S) Prandtl number (Pr) and surface temperature ( w q ) in terms of amplitude and phase angle of coefficients of skin friction, rate of heat transfer and current density at the surface of the plate. Moreover, the effects of these parameters on transient coefficients of skin friction, rate of heat transfer and current density have been discussed. The finite difference method for primitive variable transformation and asymptotic series solution for stream function formulation has been used to obtain the numerical solution of the boundary layer flow field.
Sensing Models and Its Impact on Network Coverage in Wireless Sensor Network
Ashraf Hossain,S. Chakrabarti,P. K. Biswas
Mathematics , 2008,
Abstract: Network coverage of wireless sensor network (WSN) means how well an area of interest is being monitored by the deployed network. It depends mainly on sensing model of nodes. In this paper, we present three types of sensing models viz. Boolean sensing model, shadow-fading sensing model and Elfes sensing model. We investigate the impact of sensing models on network coverage. We also investigate network coverage based on Poisson node distribution. A comparative study between regular and random node placement has also been presented in this paper. This study will be useful for coverage analysis of WSN.
Investigation of Wave Propagation in Different Dielectric Media by Using Finite Difference Time Domain (FDTD) Method
Md. Kamal Hossain,Mohammad Ashraf Hossain Sadi,Ifat-Al-Baqee,,Md. Mokarrom Hossain
International Journal of Engineering Science and Technology , 2010,
Abstract: In this paper, the wave propagation in free space and different dielectric material by using Finite Difference Time Domain (FDTD) method has been studied. Among various numerical methods Finite Difference Time Domain method is being used to study the time evolution behavior of electromagnetic field by solving the Maxwell’sequation in time domain. In this paper, FDTD method has been employed to study the wave propagation in free space and different dielectric materials. The wave equations are discretized in time and space as required by this FDTD method and leaf-frog algorithm is used to find the solution. We observed wave propagation for one and two dimensional cases. We also observed wave propagation through lossy medium for one dimensional case. For two dimensional cases the patterns of wave incident on rectangular dielectric slab, square metal, RCC pillar were observed. In order to visualize the wave propagation, the evaluation of the excitation at various locations of problem space is monitored. The numerical results agree with the propagation characteristics as expected.
Kinetics of Degradation of Eosin Y by One of the Advanced Oxidation Processes (AOPs)—Fenton’s Process  [PDF]
Ashraf Hossain, A. B. M. Sadique Rayhan, Md. Jahir Raihan, Aklima Nargis, Iqbal M. I. Ismail, Ahsan Habib, Abu Jafar Mahmood
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.712074
Abstract: Kinetics of homogeneous degradation of Eosin Y (EY), also known as Acid red 87 (CI 45380), are studied, mostly using Fenton’s process, at 30 by monitoring its absorbance at 517 nm (λmax of EY). This process is one of the advanced oxidation processes (AOPs). Mixture of H2O2 and Fe(II) ion in acetate buffer medium (pH 2.74 - 4.56) generates hydroxyl free radicals (?OH) which attack the dye molecules, resulting in degradation of the dye molecules. Results show that the initial rate of EY degradation decreases with the increasing of solution pH because of removal of kinetically important Fe (iron) species through formation of ferric hydroxide. On the other hand, the rate increases with increasing the?concentrations of H2O2, Fe(II) and EY at low solution pH. The initial rate increases with increasing of concentration of H2O2 and, subsequently remains unaffected with further increase of its concentration at a constant Fe(II) concentration because of the enhanced scavenging environment created by H2O2 at its higher concentration. The initial rate also increases with increasing of concentration of Fe(II) at a constant H2O2 concentration and remains unaffected with its further increase. EY concentration also enhances the initial rate at low pH. However, the initial rate is significantly enhanced by UV light. This is because of formation of additional hydroxyl radicals through excitation of the dye molecules by UV light. During the period of experiment, EY in aqueous solution alone hardly suffered any degradation. Degradation mechanism of EY by the Fenton and photo-Fenton’s processes is also discussed. Statistical analysis was used to validate the experimental results. Low values of the standard deviation for both the initial rate and % degradation indicated the consistency of the experimental data.
Guidelines to the Problem of Location Management and Database Architecture for the Next Generation Mobile Networks
Md. Mamun Ali Sarker,Md. Ashraf Hossain Khan,M. M. A. Hashem
Computer Science , 2013,
Abstract: In near future, anticipated large number of mobile users may introduce very large centralized databases and increase end-to-end delays in location registration and call delivery on HLR-VLR database and will become infeasible. After observing several problems we propose some guidelines. Multitree distributed database, high throughput index structure, memory oriented database organization are used. Location management guidelines for moving user in overlapping network, neighbor discovery protocol (NDP), and global roaming rule are adopted. Analytic model and examples are presented to evaluate the efficiency of proposed guidelines.
Prediction of Future Configurations of a Moving Target in a Time-Varying Environment Using an Autoregressive Model  [PDF]
Ashraf Elnagar
Intelligent Control and Automation (ICA) , 2011, DOI: 10.4236/ica.2011.24033
Abstract: In this paper, we describe an algorithm for predicting future positions and orientation of a moving object in a time-varying environment using an autoregressive model (ARM). No constraint is placed on the obstacles motion. The model addresses prediction of translational and rotational motions. Rotational motion is represented using quaternions rather than Euler representation to improve the algorithm performance and accuracy of the prediction results. Compared to other similar systems, the proposed algorithm has an adaptive capability, which enables it to predict over multiple time-steps rather than fixed ones as reported in other works. Such algorithm can be used in a variety of applications. An important one is its application in the framework of designing reliable navigational systems for autonomous mobile robots and more particularly in building effective trajectory planners. Simulation results show how significantly this model could reduce computational cost.
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