Mohamed R. M. Rizk

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The major issue related to the realization of wireless multimedia system is the design of suitable medium access control (MAC) protocol. The design challenge is to maximize the utilization of the limited wireless resources while guaranteeing the various quality of service (QoS) requirements for all traffic classes especially for the stringent real-time(More)
A wireless sensor network (WSN) consists of thousands of sensors and one base station. Sensors are deployed in the network to monitor target area and sense information according to the applied application then send this information to the base station. Adversary can inject false information in the network or compromise the routing information between nodes(More)
Railway wireless communication has become an indispensable part to provide the reliability and safety of the railway operation as well as the improved railway services. GSM for Railway (GSM-R) system is a widely used means of railway communication, its commercial success are fully explained that GSM-R system has maturity and reliability. Along with the(More)
Complex networks are found in various fields. Complex networks are characterized by having a scale-free power-law degree distribution, a small average path length (small world phenomenon), a high average clustering coefficient, and showing the emergence of community structure. Most proposed complex networks models did not incorporate all of these four(More)
Security of wireless sensor networks plays an essential role in the application they used. Due to resource limitations of sensor node, such as energy supply and memory size, pairwise keys establishment between nodes are considered a difficult problem. This paper proposes a simple shared key discovery between sensor nodes in very clear steps. The(More)
The K-means method is one of the most widely used clustering methods and has been implemented in many fields of science and technology. One of the major problems of the k-means algorithm is that it may produce empty clusters depending on initial center vectors. Genetic Algorithms (GAs) are adaptive heuristic search algorithm based on the evolutionary(More)
In this paper, a new trend in the design of a microwave amplifier is proposed. The pivot element in the design is to numerically investigate the the relation between VSWR with different frequencies, reflection coefficients, and noise figures. Multiple curves relating the VSWR with both the reflection coefficient and the transducer gain facilitates the(More)