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Wireless Sensor Network deployment using a variable-length genetic algorithm
Dina S. Deif and Yasser Gadallah
[abstract not available]
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Solar thermal power generation using a double concentration on a dish collector
Ramy Khalid Zakaria El Adli Imam, Mohamed Yassin, Mohamed Donia, and Ahmed Atiya
[abstract not available]
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Hyperlink-extended pseudo relevance feedback for improved microblog retrieval
Tarek El-Ganainy, Walid Magdy, and Ahmed Rafea
[abstract not available]
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Structural deterioration prediction modeling for coastal protection structures in alexandria eastern harbor
Ayman El Hakea, Soliman Abu-Samra, Ossama Hosny, and Hesham Osman
Limited research has been carried out on artificial-intelligence-based deterioration modeling for coastal structures. An asset inventory database (AID) for Alexandria's Eastern Harbor coastal assets was developed. Established visual inspection and condition rating procedures were followed to obtain a current structural condition index (SI) and a structural condition matrix (SCM) for each structure, considering a single inspection point. SIs and SCMs are classified into severity ranges. Taking the age of structure into account, transition probabilities between each of the deterioration severity ranges were calculated using backward analysis. Such probabilities then were utilized to formulate the structure's Markov- Chain (MC) transition probability matrix, enabling the prediction of future deterioration in case of a no-action policy. Furthermore, an artificial neural network (ANN) model was constructed using the same backward analysis concept. Comparing the MC and the ANN deterioration forecasts up to year 2050 for the same structures, the results showed very close deterioration trends with an error margin ranging between 5% and 12%. It was concluded that the stochastic MC-based deterioration modeling was more accurate in simulating the deterioration of structures between their year of construction and present. The deterministic ANN model showed promising capability of deterioration prediction depending on the quality of the structure's design data, historical records, and environmental conditions. © 2014 American Society of Civil Engineers.
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On the stable throughput of cooperative cognitive radio networks with finite relaying buffer
Adel M. Elmahdy, Amr El-Keyi, Tamer Elbatt, and Karim G. Seddik
[abstract not available]
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Low-power all-digital manchester-encoding-based high-speed serdes transceiver for on-chip networks
Abdelrahman H. Elsayed, Ramy N. Tadros, Maged Ghoneima, and Yehea Ismail
This paper proposes a new architecture that multiplexes both data and clock on serial links, reduces Inter symbol interference (ISI) by using a resistive termination technique, and uses two-level Manchester encoding to solve the reduced swing problem and enable the use of power efficient circuitry. Using this signaling scheme makes the system insensitive to jitter accumulation along the transmission line, and avoids the need for a power hungry clock and data recovery (CDR) circuit. A self-calibrating digital-delay line is also implemented inside the decoder to enable the system to operate efficiently across process, voltage and temperature variations. The proposed scheme is implemented for a 3mm long on-chip transmission line in TSMC 65nm technology and simulation results are presented. © 2014 IEEE.
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Performance evaluation of finFET based SRAM under statistical VT variability
Ahmed T. El-Thakeb, Hamdy Abd Elhamid, Hassan Mostafa, and Yehea Ismail
[abstract not available]
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Adaptive spectrum hole detection using Sequential Compressive Sensing
Ahmed M. Elzanati, Mohamed F. Abdelkader, Karim G. Seddik, and Atef M. Ghuniem
[abstract not available]
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Novel aluminum-carbon nanotubes composites for structural applications
Amal M. K. Esawi, E. Salama, and Y. Ibrahim
The development of aluminum-carbon nanotubes (Al-CNT) composites has seen a surge in interest following promising results reported by various groups. The latest enhancements achieved by the research group: an increase in tensile strength and Young's modulus of 69% and 23% respectively for Al-CNT composites with 5 wt. % MWCNT were accompanied by a reduction in ductility expected to limit the applications of these novel composites. This is currently being addressed through the use of (1) dual matrix approach in which the CNTs are embedded in a first matrix of aluminum powders which are consequently embedded in a second matrix of aluminum; (2) functionally-graded (FG) approach in which a gradual change in the composition of the CNT-reinforced regions is tailored so as to produce a design-efficient material with an ultra hard surface that gradually leads to a soft core. The two approaches aim at enhancing the formability of the material for wider industrial applications.
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Optimization-based approach for organizing the bidding of nonserial repetitive projects
Ahmed Samer Ezeldin and Ahmed M. Alhady
In practice, the number of contracts and the categories of contractors to be called for bidding on nonserial repetitive projects under one major program often are estimated on the basis of intuition and experience. It may involve emotional reactions to existing surrounding conditions. Accordingly, the factors that form the possible different scenarios should be properly analyzed and evaluated. This paper introduces an analytical model that allows for decisions on the number of contracts and projects per contractor for different contractor categories within major construction infrastructure programs. These optimum decisions are reached using an integrated time and cost objective. Genetic algorithm has been employed for performing optimization. A computer-based model has been developed and validated. © 2014 American Society of Civil Engineers.
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Birth of the 'Secular' Individual: Medical and Legal Methods of Identification in Nineteenth-Century Egypt
Khaled Fahmy
[no abstract provided]
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An IP-based arrangement to connect wireless sensor networks to the Internet of Things
Yasser Gadallah, Ehab Elalamy, and Mostafa Eltager
[abstract not available]
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Innovative and cost-effective coring technique extended coring for long intervals of multiple zones with world record - Case histories from the UAE
M. Hegazy Gehad, Adel M. Salem, Shedid A. Shedid, Muhammad N. Aftab, and Ali Muhammad
[abstract not available]
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Image matching assessment of attainable topology via kriging interpolated level-sets
David Guirguis, Mohamed Aly, Karim Hamza, and Hesham Hegazi
[abstract not available]
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Network fabric redundancy in NCS
Hassan H. Halawa, Yara K. Hilal, Gina H. Aziz, Christine H. Alfi, and Ramez M. Daoud
[abstract not available]
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Nanocrescent antenna as a transceiver for optical communication systems
Islam E. Hashem, Nadia H. Rafat, and Ezzeldin A. Soliman
[abstract not available]
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Seismic retrofit of shear critical beam-column joints in existing concrete buildings
Wael M. Hassan and A. A. Bilal
Shear deficient beam-column joints in existing concrete buildings are believed to have caused partial or total structural collapses during past earthquakes. These joints primarily lack joint transverse reinforcement. A recent NEES grand challenge project resulted in detailed assessment tools for the seismic vulnerability of beam-column joints in existing buildings; however, retrofit strategies were not suggested. The literature body includes various retrofit solutions for interior and exterior joints. However, most of these solutions are either very expensive or highly invasive. The intent of retrofit is usually to have deficient joints to conform to ACI 352 to allow for flexural yielding in the beam using minimal joint alteration. This paper presents a simple retrofitting method for existing exterior beam-column joints that aims to transfer the mode of failure from joint shear failure to a weak-beam-strong column one with no shear degradation in the joint. The retrofit solution is validated through an experimental program that consists of testing four exterior beam-column joint sub-assemblages.
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Application of parallel redundancy in a Wi-Fi-based WNCS using OPNET
Mostafa Hendawy, Mohamed Elmansoury, Karim N. Tawfik, Mohamed M. Elshenawy, and Alia H. Nagui
[abstract not available]
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Mohamed Galal (1906-1943): A pioneering egyptian anthropologist
Nicholas S. Hopkins
[no abstract provided]
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Multi-resolution broadcasting over the Grassmann and stiefel manifolds
Mohammad T. Hussien, Karim G. Seddik, Ramy H. Gohary, Mohammad Shaqfeh, and Hussein Alnuweiri
We consider the design of space-time codes for multi-resolution multiple-input multiple-output (MIMO) broadcast communication systems. Two classes of receivers are considered: high-resolution (HR) receivers, which have access to reliable channel state information (CSI) and can perform coherent detection, and low-resolution (LR) receivers which do not have access to CSI and can only perform non-coherent detection. We propose a layered encoding structure, whereby, for the LR receivers, the transmitted codewords are chosen to be points on the Grassmann manifold whereas, for the HR receivers, incremental information is encoded in the particular bases of the transmitted codewords, thereby representing points on the Stiefel manifold. For the HR receivers, we develop a computationally-efficient two-step detector. Using this detector, we show that the proposed structure enables reliable coherent communication of the incremental HR information without compromising the reliability with which the basic LR information is non-coherently communicated. We also show that this structure enables full diversity to be achieved for both LR and HR receivers. Finally, we show that this structure achieves the maximum number of degrees of freedom for non-coherent LR channels and coherent HR channels with unitarily-constrained input signals. © 2014 IEEE.
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Layered coding with non-coherent and coherent layers over fading channels
Mohammad T. Hussien, Karim G. Seddik, Mohammad Shaqfeh, and Hussein Alnuweiri
In this paper, we consider a novel layered coding approach with two layers. One of the two layers, denoted by the base-layer, can be received by any receiver even if it does not have reliable channel estimates. The other, refining-layer can only be received by any receiver that has channel state information. We propose signal constellations that allow the transmission of coherent and non-coherent information for the single-antenna transmitters. We derive upper bounds for the pairwise error probability for the coherent and non-coherent receivers and prove that our proposed signal constellations can achieve a diversity of order M for the 1 × M system, for both the coherent and non-coherent receivers. © 2014 IFIP.
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The design and implementation of a constrained WSN for permaculture farming in Egypt
Ahmed Ismail and Karim Seddik
[abstract not available]
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