French University of Egypt
Cairo, Egypt

The French University in Egypt . Established in 2002 in cooperation with the Paris III: Sorbonne University, the Nantes University, Haute Alsace University and the Corse University.A convention with Paris VI University concerning the engineering school was also signed.The university is located in El-Shorouk city, 37 km from the center of Cairo.The university uses French , English and Arabic languages in teaching, and its graduates are able to use these three languages in any work domain related to their specialization. Wikipedia.

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Zakhary S.,University of Nottingham | Radenkovic M.,University of Nottingham | Benslimane A.,University of Avignon | Benslimane A.,French University of Egypt
IEEE Transactions on Vehicular Technology | Year: 2014

This paper proposes a novel fully distributed and collaborative k-anonymity protocol (LPAF) to protect users' location information and ensure better privacy while forwarding queries/replies to/from untrusted location-based service (LBS) over opportunistic mobile networks (OppMNets). We utilize a lightweight multihop Markov-based stochastic model for location prediction to guide queries toward the LBS's location and to reduce required resources in terms of retransmission overheads. We develop a formal analytical model and present theoretical analysis and simulation of the proposed protocol performance. We further validate our results by performing extensive simulation experiments over a pseudorealistic city map using map-based mobility models and using real-world data trace to compare LPAF to existing location privacy and benchmark protocols. We show that LPAF manages to keep higher privacy levels in terms of k-anonymity and quality of service in terms of success ratio and delay, as compared with other protocols, while maintaining lower overheads. Simulation results show that LPAF achieves up to an 11% improvement in success ratio for pseudorealistic scenarios, whereas real-world data trace experiments show up to a 24% improvement with a slight increase in the average delay. © 2013 IEEE.

Ibrahim Z.M.,University of Windsor | Ngom A.,University of Windsor | Tawfik A.Y.,French University of Egypt
IEEE/ACM Transactions on Computational Biology and Bioinformatics | Year: 2011

This paper demonstrates the use of qualitative probabilistic networks (QPNs) to aid Dynamic Bayesian Networks (DBNs) in the process of learning the structure of gene regulatory networks from microarray gene expression data. We present a study which shows that QPNs define monotonic relations that are capable of identifying regulatory interactions in a manner that is less susceptible to the many sources of uncertainty that surround gene expression data. Moreover, we construct a model that maps the regulatory interactions of genetic networks to QPN constructs and show its capability in providing a set of candidate regulators for target genes, which is subsequently used to establish a prior structure that the DBN learning algorithm can use and which 1) distinguishes spurious correlations from true regulations, 2) enables the discovery of sets of coregulators of target genes, and 3) results in a more efficient construction of gene regulatory networks. The model is compared to the existing literature using the known gene regulatory interactions of Drosophila Melanogaster. © 2011 IEEE.

Kirah K.,French University of Egypt
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

We have simulated a photovoltaic (PV) pn junction where a texturing structure from Silicon nanowires (NWs) is added. While the NWs diameter was kept constant at a value of 100 nm, their lengths were varied over the range from 1 μm to 100 μm. A noticeable enhancement in the device efficiency is found. This improvement is due to that the added texture has significantly decreased the optical reflectance and increased the optical absorption of the surface. © 2013 SPIE.

Kirah K.,French University of Egypt
Optics InfoBase Conference Papers | Year: 2011

The use of carbon nanotubes (CNTs) represents a typical approach to reduce both cost and size and to improve the efficiency of photovoltaic (PV) devices. In order to concentrate the incident power in what is known as hot spots, an array spatial arrangement has been formed as a square mesh fractal topology. The interaction between electromagnetic waves from the sun and CNTs is simulated in order to calculate the amount of absorbed power. A home built simulator based on the self-consistent solution of Poisson's equation and the semi-classical drift-diffusion equations is used to calculate the I-V characteristics of the device and hence its efficiency. © 2011 AOS.

Kirah K.,French University of Egypt
Electronics Letters | Year: 2012

The stress-induced leakage current (SILC) in short-channel n-MOSFETs is calculated based on a previously developed model for the steady-state component of SILC across the ultra-thin gate oxide of a MOS capacitor. It is found that the contribution of the component due to SILC in the gate current of MOSFETs must not be neglected. It is also found that SILC is larger in the source side than in the drain side. © 2012 The Institution of Engineering and Technology.

Abdellatif S.,The British University in Egypt | Kirah K.,French University of Egypt | Ghali H.,The British University in Egypt | Anis W.,Ain Shams University
Optical Materials Express | Year: 2012

The effect of enclosing a nanowire (NW) radial pn junction photovoltaic (PV) element inside a nanoring optical antenna to enhance the electric field in the near field region has been investigated. Five different materials for the NW (Si, Ge, GaAs, GaInP and InGaAs) have been selected to maximize the absorbed solar spectrum. In addition, the position and diameter of the NW are varied through a random distribution to optimize the power conversion efficiency. Results show that the ring antenna geometry and the NW random spatial distribution are effective in both spectral widening and field concentration which result in an increase of the cell conversion efficiency. © 2012 Optical Society of America.

Hamdoun S.,University Paris Est Creteil | Rachedi A.,University Paris Est Creteil | Benslimane A.,French University of Egypt
2013 International Conference on Selected Topics in Mobile and Wireless Networking, MoWNeT 2013 | Year: 2013

RSSI-based location estimation method in Wireless Sensor Networks (WSNs) present some advantages in terms of complexity and energy consumption. However, the propagation of the radiofrequency signals in indoor environments is subject to fading induced by shadowing effect and multipath propagation. Accurate wireless location estimation can be achieved by employing multiple antennas. In this paper, we make a comparison among three system models in order to show the impact of using multiple antennas on position accuracy at either the transmitter, the receiver side or at the both sides. We use the multilateration as well as the trilateration algorithms to calculate the position error. The obtained results illustrate that the localization performance is improved when using multiple antennas. Specifically, using multiple antennas at the both sides present better performance than using multiple antennas at either the transmitter or the receiver. © 2013 IEEE.

Jaoua M.,French University of Egypt
Science and engineering ethics | Year: 2014

The Arab Spring of 2011 has highlighted an unprecedent fact in the region: it was the young and educated population who established the spearheading of change, and led their countries to democracy. In this paper, we try to analyze how science has been a key factor in these moves, in Tunisia as well as in Egypt, and how it can help to anchor democracy in these countries.

Sabry M.-N.,French University of Egypt
Proceedings of the ASME InterPack Conference 2009, IPACK2009 | Year: 2010

Thermal stresses developed in electronic systems mainly depend, not only on average temperature values, but rather on wall temperature profiles. These profiles are difficult to predict unless one uses detailed finite element or finite difference modeling and simulation techniques. This type of analysis is only suitable at final design phases were geometrical details are available or being finalized. It is not suitable at early design phases to get a rapid estimate of wall thermal gradients to orient design appropriately. Standard approaches involving correlations for the heat transfer coefficient fail to predict temperature profiles for many reasons. In fact, these correlations depend on temperature profile as an input. In most engineering applications, walls are neither infinitely conducting nor of negligible conductivity to justify the usage of either uniform temperature or uniform heat flux assumptions. Correlations addressing conjugate heat transfer would not be able to solve the problem, unless a large number of them were available covering all possible combinations of fluid and wall conditions. Besides, the case of multiple heat sources, quite common in modern systems, can never be correctly handled by such an approach. The flexible profile technology was proposed earlier to model heat transfer in either solids (conduction) or fluids (forced convection. The model depends on domain (fluid or solid) geometry and physical properties, regardless of the particular set of applied boundary conditions, including that of multiple heat sources. Combining a fluid flexible profile model with a solid one, will allow predicting wall temperature profiles, with an adjustable level of precision, depending on the number of degrees of freedom retained. It will be applied in this paper to predict thermally induced stresses in some simple test cases as a demonstrator of the potentials behind this approach. Copyright © 2009 by ASME.

Abdellatif S.,The British University in Egypt | Kirah K.,French University of Egypt
Energy Procedia | Year: 2013

A numerical model for a vertical-aligned nanowire (NW) radial p-i-n junction-based photovoltaic (PV) device is presented. The fill factor, the power conversion efficiency, the optimum device length, radius and doping level are calculated using a simulator built on the commercial package Comsol Multiphysics only. The sensitivity of the Si nanowire to temperature variations is also investigated. The results are found to be in accordance with the available experimental measurements. © 2013 The Authors Ltd.

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