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Shah Alam, Malaysia

MEDIU is an independent, non-profit educational institution, located in Malaysia. The university was established in 2006, founded on Islamic principles and values. MEDIU is licensed by the Malaysian Ministry of Higher Education and its programs are accredited by the Malaysian Qualification Agency . The university is managed by Rector Prof. Dr. Mohammad Khalifa Al-Tamimi. Wikipedia.

Jh J.H.,Multimedia University | Chin T.S.,Multimedia University | Abbou F.M.,Al-Madinah International University
Journal of Optical Communications

The atmospheric attenuation in optical waves due to low atmospheric visibility conditions causes a performance degradation of free space optical (FSO) communication systems. A simulation was conducted to determine the relationship between visibility in fog and optical attenuation (dB/km) at an optical wavelength of 1550nm. In this paper, we investigate the bit error rate (BER) performance for free space optical systems operating over atmospheric attenuation channels. Simulation results are demonstrated to confirm the analytical results. From the results, we conclude that BER increases as the adverse weather and greater distance. The BER performance of free space optical (FSO) communication systems employing on-off keying (OOK) modulation format is derived. Because the fog consists mainly of particles much larger than the laser wavelength, the application of the Kruse equation to attenuation in fog is not appropriate. Because fog is the only type of weather that is likely to disrupt short (< 1 km) free space optical links, short FSO links will be necessary to meet the high availability requirements of the telecommunications industry. The key finding is that the generally accepted Kruse equation relating visibility and optical attenuation may be too pessimistic at low visibilities. A new equation describing the atmospheric attenuation of optical power is proposed. Copyright © 2011 De Gruyter. Source

Etengu R.,Multimedia University | Abbou F.M.,Alcatel - Lucent | Wong H.Y.,Multimedia University | Abid A.,Al-Madinah International University | And 2 more authors.
Journal of Optical Communications

The performance of single photon pulsed polarization based BB84 and B92 platforms against individual attacks for free space quantum optical communication links between a ground station and a satellite in the low earth orbit is compared. The comparison is attained by evaluating the quantum bit error rate and secure communication bit rate on secure optical link loss and the sensitivity of different parameters. Precisely, realistic experimental parameters are used and the obtained results are compared with those of other papers. Quantum bit error rates as low as 3.5% have been regularly obtained. Moreover, with repetition rate of 10 MHz at the low earth orbit standard orbital altitude of 100 km and at zenith angle of 60 degrees, secure communication bit rates of ~ 280 kHz and ~ 70 kHz were received for the BB84 and B92, respectively. The obtained results show that the BB84 protocol exhibits better performance than B92 in the distribution of the secure communication key over long distance. Overall, these results reveal that it is possible to obtain secure key exchange in the low earth orbit, an idea which can be extended to other long distance laser links such as geostationary orbit. Copyright © 2011 De Gruyter. Source

Patel A.,National University of Malaysia | Patel A.,Kingston University | Seyfi A.,National University of Malaysia | Tew Y.,National University of Malaysia | And 2 more authors.
Library Hi Tech News

Purpose: Grid computing, cloud computing (CC), utility computing and software as a service are emerging technologies predicted to result in massive consolidation as meta-level computing services of everything beneath one umbrella in the future. The purpose of this study is to foster the understanding and differentiation, by using the three aforementioned types of computing technologies and software, as a service by both public and private libraries to meet their expectations and strategic objectives. Design/methodology/approach: The approach in this study is a review based on comparing the four computing technologies with a brief analysis for researching and designing the mind map of a new meta-level computing service approach, taking into consideration the need for new economic tariff and pricing models as well as service-level agreements. Findings: Since it is anticipated that there will be likely potential consolidation and integration of computing services, a study of these four most advanced computing technologies and their methodologies is presented through their definition, characteristics, functionalities, advantages and disadvantages. This is a well-timed technological advancement for libraries. Practical implications: It appears that the future of library services will become even more integrated, running over CC platforms based on usage rather than just storage of data. Social implications: Libraries will become an open useful resource to all and sundry in a global context, and that will have huge societal benefits never imagined before. Originality/value: Concisely addresses the strategies, functional characteristics, advantages and disadvantages by comparing these technologies from several service aspects with a view to assisting in creating the next generation outer space computing. © Emerald Group Publishing Limited. Source

Hilles S.M.S.,Al-Madinah International University | Maidanuk V.P.,Vinnytsia National Technical University
ARPN Journal of Engineering and Applied Sciences

This paper present image coding which is gained many researchers attention in order to improve the quality of image after the compression process. Since this is expended most computing resources and research which is related not only to search for a mathematical transformation, but also to study the characteristics of visual perception of the image features and fail-safe transmission of images via communication channels. There are many methods of image coding with neural networks of 2D SOFM kohonen map have been suggested and investigated. The coding schemes are proposed methods vector quantization as the original image, and the spatial frequency image component derived from the adaptive to the contours of the two-dimensional analysis and synthesis. The calculation of the computational cost in compression based on Kohonen maps. The methods are characterized by a high level of adaptation due to the introduction of educational stage that provides for the increase of multiplication ratio and high quality of image restarting after coding. The modified method of image multiplexing based on characteristic feature of the given method is vector digitizing of image components. This paper considers the coding problem of photo realistic images, presented in a digital form. The characteristic feature of the method is the application of pair exchange, this increases processing speed and sorting of data arrays. However the result of proposed method is shown the image quality after compression processor. Using this approach the differences or lost pixels between the image after and before compression processer are considered. The propose method may useful for image representation and image coding researcher and such related field. © 2006-2014 Asian Research Publishing Network (ARPN). Source

Reza A.G.,Multimedia University | Chin T.S.,Multimedia University | Abbou F.M.,Al-Madinah International University
2010 International Conference on Photonics, ICP2010

This paper proposes a hybrid buffering architecture using feed-forward and feedback shared FDLs to resolve packet contention resolution of an optical packet switch. Feed-forward FDLs are used as primary buffer and feedback FDLs are implemented as supplementary buffer. The proposed switch can avoid time slot overlapping which enables to use FDL resources in a highly efficient manner. It is found that the proposed switch achieves satisfactory performance at the price of a reasonable amount of FDLs. Simulation result shows that proposed hybrid buffering switch achieves packet loss rate between 10-1 and 10-2 at heavy traffic load (ρ = 0.9) for a 32×32 switch using different FDL length. © 2010 IEEE. Source

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