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Ismail O.,AASTMT
ICCTD 2010 - 2010 2nd International Conference on Computer Technology and Development, Proceedings | Year: 2010

Interest point detection and matching is a basic computer vision task. This paper uses the Non-Subsampled Contourlet Transform (NSCT) detector with some local descriptors to develop a robust Interest point matching system. The NSCT -based detector is very efficient in extracting relevant image features that have good localization and rich geometric information. Once interest points have been extracted, invariant descriptors can be computed to represent these points and match them by comparing their descriptors using similarity distance metric measure. Several experiments have been conducted on a variety of datasets that compare the proposed approach to the widely used Harris and Hessian detectors with the same local descriptors. The results show that the NSCT method is efficient in natural scenes with distinctive texture, occlusion and clutter objects. It offers robustness for detecting points in blurred images. It is also invariant to rotation, translation, and partially invariant to scale and viewpoint angle changes. © 2010 IEEE. Source

Mohamed N.A.,University for Information Science and Technology | El-Azeim M.A.,AASTMT | Zaghloul A.,University for Information Science and Technology | El-Latif A.A.A.,Menoufia University
Proceedings of the 2015 7th International Conference of Soft Computing and Pattern Recognition, SoCPaR 2015 | Year: 2015

In present time, in order to provide security of multimedia data while transmission and storage processes, the protection of image data can be accomplished using encryption. This paper presents a new image encryption scheme relaying on a chaotic 3D cat map and Turing machine in the form of dynamic random growth technique. The proposed technique composed of two processes of pixels' locations confusion using a chaotic 3D cat map, which is performed concurrently with substituting values swapping pixels' locations using Turing machine. The generated key is dependent on the plain image, to resist the chosen plaintext attack. Both experimental and security analysis show that the presented technique can achieve a large key space and resist the common against cipher attacks. These good cryptographic advantages make it suitable for image transmission over network. © 2015 IEEE. Source

Ismail N.M.,AASTMT | Ismail N.M.,CA Technologies | Iskander M.,Coastal Research Institute | El-Sayed W.,Coastal Research Institute
Proceedings of the Coastal Engineering Conference | Year: 2012

This paper presents an assessment of the performance of a shoreline revetment; M. Ali Seawall, placed to protect the land behind against flooding and overtopping at coastal site, within Abu Qir Bay, East of Alexandria along the Nile Delta coast. Coastal zone management of the bay coastline is of utmost significance to the protection of the low agricultural land and the industrial complex located in the rear side of the seawall under the current and progressive effects of climate change. The latest storm in December 2010, which hit the Nile Delta and which was the severest in the last decades showed that generated surges, up to 1.0 m as well as a maximum of 7.5 m wave height in the offshore of Alexandria presented a major natural hazard in coastal zones in terms of wave run up and overtopping. The storm, fortunately, resulted in a partial and modest flooding of the zone behind the seawall particularly in the beach segment, located in the middle of the seawall. This research project aims to the design review of the seawall which was first constructed in 1830 to protect the lowland agricultural area, 2.0 m below mean sea level, and was rehabilitated in 1981 as part of the Master Plan of the Nile Delta Coastal Zone Management. The seawall was further upgraded in 2009; one year before the 2010 storm. The paper will give an overview of the seawall design and its upgrades and the current conducted hydrodynamic analyses to estimate wave height distributions, wave run up and overtopping over the seawall and its beach segment. Use has been made of the in-house modified ImSedTran-2D model as well as universal design standards as EurOtop (2008). Based on the results for worst design scenarios, recommendations are given to increase the height of the seawall cap, to strengthen the beach top and back slope with a facility to drain storm water to increase coastal resilience behind the seawall. Comparison of the predicted overtopping with the observed wave overtopping volumes during the 8hrs-2010 storm, allowed the verification of the used universal design tools. Impact of precise estimate of storm and barometric surge as well as seawall armor roughness and shapes on overtopping rates are highlighted. Source

Elmasry M.I.S.,AASTMT | El-Ashkar N.H.,AASTMT | Alasadi M.F.A.,AASTMT
ICSDEC 2012: Developing the Frontier of Sustainable Design, Engineering, and Construction - Proceedings of the 2012 International Conference on Sustainable Design and Construction | Year: 2013

Special structures such as bridges, nuclear and power plants, etc, have unique importance. These strategic structures age and degrade with time. Previously, visual inspection was the main tool for following such structures' degradation. Recently, Structural Health Monitoring (SHM) is used by the industry as a viable technique to obtain continuous realtime data about the safety and serviceability of vital structures. Moreover, measuring electrical resistivity is a low cost, simple, efficient method that has received recent attention in terms of SHM. The objective of this study is to use electrical resistivity measurements in SHM of Reinforced Concrete (RC) beams. An experimental program is conducted to study the effect of crack initiation and propagation in RC beams on Inner Electrical Resistivity Measurements (IERM) when beams are loaded by the three-point bending test. The results show that the technique is effective in detecting cracks and can be extended to global SHM of RC structures. © 2013 American Society of Civil Engineers. Source

Elsaharty M.A.,AASTMT | Hamad M.S.,AASTMT | Ashour H.A.,AASTMT
IECON Proceedings (Industrial Electronics Conference) | Year: 2011

Current controlled inverter using hysteresis controller is popular due to the simplicity of the algorithm implementation with a robust dynamic response. However, the controller action requires the use of analogue circuitry to maintain its characteristics which lacks the interfacing, maintenance, flexibility, and integration of a digital system. In this paper, a digital hysteresis controller based on sampling the feedback signal and applying control action at a fixed interval is investigated. The controller is applied on three proposed configurations for a single phase grid connected inverter with a designed LCL filter and a primary control loop on the filter inductor current. Parameters affecting the hysteresis controller primary characteristics are investigated and a selection criteria of filter parameters is derived. To eliminate performance issues arising from parameters mismatching and variable switching frequency, adaptive hysteresis band calculation and a secondary control loop is proposed. By means of simulation and experimental implementation, the performance of the configurations is evaluated. © 2011 IEEE. Source

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