Hadia El Hennawy

B2. Approximate electromagnetic cloaking of spherical bodies

In cloaking, a body is hidden from detection by surrounding it by a coating cloaking material. In the coordinate transformation method the body to be hidden is transformed virtually into a point or a line. Some components of the electrical parameters of the cloaking material (ε, μ) are required to have infinite or zero value at the boundary of the hidden object. Approximate cloaking can be achieved by transforming the hidden body virtually into a small object rather than a point or a line, which eliminates the zero or infinite values of the electrical parameters. In this work the scattering properties of the cloaked object are studied for conducting and dielectric sphere as a function of the virtual transformed object radius. The electrical parameters values of the cloaking material are also studied as a function of the radius of the virtual transformed object and the cloaking shell thickness.

B6. Multiband sharp-skirt compact gap resonator based D-CRLH

In this paper, a novel design of multi band (dual/quad) coupled gap transmission line resonators based on dual composite right/left handed microstrip structure is developed. The introduced structures demonstrate dual and quad resonances high selective sharpness passband response. The consummate structures was designed using one and two cells consist of a combination of a shunt tank related to interdigital capacitor and strip inductor, in addition to series tank intended using patch capacitor with small strip inductor. Furthermore, the paper elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. The results manifest four sharp pass band resonances at 4 GHz, 5.8 GHz, 6.6 GHz, and 7.7 GHz with transmission coefficients equal -0.69 dB, -1.9 dB, -3.9 dB, and -3.7 dB, respectively. The quality factor demonstrates very high selectivity and equals 75.75, 151.75, 125, and 82.7 at the four bands, respectively.

Towards Reliable Mobile Cloud Computing

Cloud computing has been one of the fastest growing components of the IT industry. It altered the future of the web by having computing, communication, and storage provides as services to internet users. Mobile Cloud Computing (MCC) is currently gaining steam as an extension to cloud computing as it delivers a large variety of cloud application to billions of smartphones and wearable devices. This paper studies reliability for MCC by determining the ability of a system component to function correctly under different scenarios for a specified period of time. Our aim is to be able to estimate and manage uncertainty and risks of failure. The assessment procedures consist of determine Mean Time between Failures (MTBF), Mean Time to Failure (MTTF), and availability percentages for main components in both cloud computing and MCC structures applied on single node OpenStack installation to analyze its performance with different settings governing the behavior of participants. Additionally, we present here several factors with significant impact on the overall cloud system reliability that should be taken into account in order to deliver highly available cloud computing services for mobile consumers.

Design of LEA: Link encryption algorithm new proposed stream cipher algorithm

Cryptographic algorithms for confidentiality and authentication play a major important role in nowadays information security [1]. Encryption algorithms are becoming more necessary to ensure the securely transmitted data over insecure communication channels. A new stream cipher is proposed. The design is very simple and based on 16 shift registers, nonlinear and an output function. The proposed algorithm is characterized by a high performance in software with measured encryption/decryption on Pentium IV processor. We have performed detailed security analysis, in particular, and standard statistical randomness test of the produced ciphertext. Experimental results in terms of performance and resources are presented.

Approximate electromagnetic cloaking and scattering of a dielectric cylinder with nonhomogeneous anisotropic cloaking material

Cloaking refers to hiding a body from detection by surrounding it with a coating consisting of an unusual anisotropic nonhomogeneous material. The permittivity and permeability of such a cloak are determined by the coordinate transformation of compressing a hidden 2D or cylindrical body into a line. Some components of the electrical parameters of the cloaking material (ε,μ) are required to have infinite or zero value at the boundary of the hidden object. In order to eliminate the zero or infinite values of the electrical parameters, approximate cloaking can be used by transforming the cylindrical body virtually into a small cylinder rather than a line, but this produces some scattering. In this work, the scattering pattern, and the back scattering cross section against the frequency for cloaked dielectric cylinder are studied for both transverse magnetic (TMz) and transverse electric (TEz) polarizations of the incident plane wave for different transformed body radii.

Electromagnetic scattering by approximately cloaked cylindrical bodies with nonhomogeneous anisotropic cloaking material

In cloaking, a body is hidden from detection by surrounding it by a coating consisting of an unusual anisotropic nonhomogeneous material. The permittivity and permeability of such a cloak are determined by the coordinate transformation of compressing a hidden body into a point (3D or spherical configuration) or a line (2D or cylindrical configuration). Some components of the electrical parameters of the cloaking material are required to have infinite or zero value at the boundary of the hidden object. Approximate cloaking can be achieved by transforming the cylindrical bodies (dielectric and conducting) virtually into a small cylinder rather than a line, which eliminates the zero or infinite values of the electrical parameters but produces scattering. The solution is obtained by rigorously solving Maxwell equations using angular harmonics expansion. In this work, the scattering pattern and the back-scattering cross-section against the frequency for cloaked conducting and dielectric cylinders are studied for both transverse magnetic (TMz) and transverse electric (TEz) polarizations of the incident plane wave for different transformed body radii.