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- 저자 : ( M. Mehedi. Hassan ) (검색결과 3 건)
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Influence of Cr incorporation on structural, dielectric and optical properties of ZnO nanoparticles
M. Mehedi Hassan,Wasi Khan,Ameer Azam,A. H. Naqvi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
This study demonstrated the effect of Cr doping on structural, dielectric and optical behavior of ZnOnanoparticles synthesized through sol–gel method. Characteristic investigations have been carried outby X-ray diffraction, Field emission scanning electron microscope, Energy dispersive X-ray spectrometry,and Transmission electron microscope. The results confirmed the formation of nanoparticles inpolycrystalline single phase with hexagonal wurtzite structure. The crystallite size has been found tovary around 20 nm. Dielectric studies were carried out by Impedance spectroscopy. The decrease effectof dielectric parameters with increase in dopant has been explained on the basis of Maxwell–Wagnermodel and Koops phenomenological theory. The impedance analysis suggested that the contribution ofgrain boundaries is dominating over grain contribution. A red shift in UV–vis spectra signified that bandgap can be tuned by Cr doping from 3.32 to 3.22 eV because of the s–d and p–d exchange interactions.
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Efficient Virtual Machine Resource Management for Media Cloud Computing
( Mohammad Mehedi Hassan ),( Biao Song ),( Ahmad Almogren ),( M. Shamim Hossain ),( Atif Alamri ),( Mohammed Alnuem ),( Muhammad Mostafa Monowar ),( M. Anwar Hossain ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.5
Virtual Machine (VM) resource management is crucial to satisfy the Quality of Service (QoS) demands of various multimedia services in a media cloud platform. To this end, this paper presents a VM resource allocation model that dynamically and optimally utilizes VM resources to satisfy QoS requirements of media-rich cloud services or applications. It additionally maintains high system utilization by avoiding the over-provisioning of VM resources to services or applications. The objective is to 1) minimize the number of physical machines for cost reduction and energy saving; 2) control the processing delay of media services to improve response time; and 3) achieve load balancing or overall utilization of physical resources. The proposed VM allocation is mapped into the multidimensional bin-packing problem, which is NP-complete. To solve this problem, we have designed a Mixed Integer Linear Programming (MILP) model, as well as heuristics for quantitatively optimizing the VM allocation. The simulation results show that our scheme outperforms the existing VM allocation schemes in a media cloud environment, in terms of cost reduction, response time reduction and QoS guarantee.
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A Privacy-aware Graph-based Access Control System for the Healthcare Domain
( Yuan Tian ),( Biao Song ),( M. Mehedi. Hassan ),( Eui-nam Huh ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.10
The growing concern for the protection of personal information has made it critical to implement effective technologies for privacy and data management. By observing the limitations of existing approaches, we found that there is an urgent need for a flexible, privacy-aware system that is able to meet the privacy preservation needs at both the role levels and the personal levels. We proposed a conceptual system that considered these two requirements: a graph-based, access control model to safeguard patient privacy. We present a case study of the healthcare field in this paper. While our model was tested in the field of healthcare, it is generic and can be adapted to use in other fields. The proof-of-concept demos were also provided with the aim of valuating the efficacy of our system. In the end, based on the hospital scenarios, we present the experimental results to demonstrate the performance of our system, and we also compared those results to existing privacy-aware systems. As a result, we ensured a high quality of medical care service by preserving patient privacy.
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