Waleed A. Youssef

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Many applications of wireless sensor networks (WSNs) have emerged over the last few years. In such networks resource-constrained sensor nodes are deployed to probe their surroundings and send the collected data to one or multiple gateways for processing. Therefore, proper placement of sensors and gateways in the area of interest facilities communications(More)
Wireless sensor networks (WSN) have attracted much attention in recent years due to their potential use in many applications such as border protection and combat field surveillance. Given the criticality of such applications, maintaining a dependable operation of the network is a fundamental objective. However, the resource-constrained nature of sensor(More)
Recently, we have proposed ANSWER: AutoNomouS Wireless sEnsor netwoRk as a service platform whose mission is to provide dependable information services to in-situ mobile users while satisfying their quality-of-service (QoS) requirements. Alongside with the stationary tiny sensors, the network employs more powerful mobile devices referred to as aggregation(More)
Wireless sensor networks (WSNs) have recently gained increased attention due to their potential use in numerous civil and military applications. In many of these applications, resource-constrained sensors are deployed to probe their surroundings and report their findings to one or multiple gateway nodes. In large networks, many sensors get involved in data(More)
Wireless Sensor Networks (WSNs) has been attracting lots of interest in recent years. In such networks sensors data are collected over multi-hop routes at one or multiple base-stations (gateway nodes) for processing. In many WSN applications such as disaster management and combat field surveillance, rapid response to detected events is necessary and thus(More)
In wireless sensor networks, sensor readings are gathered at a gateway for processing and forwarding to a remote command center. The potential closeness of the gateway to dangerous events, e.g. fires, exposes it to damage and thus risks making the network dysfunctional. Therefore, protecting the gateway by repositioning it away from safety-hazardous spots(More)
Recently, wireless sensor networks (WSN) have received enormous attentions due to their potential use in many applications. They can be used to enrich our understanding of natural events, such as earthquakes and volcanoes, and to increase the efficiency of surveillance operations in secure installation, border control and military reconnaissance. Sensors(More)
is one of ten regional units mandated by Congress and established in Fall 1988 to support research, education, and training in surface transportation. The UC Center serves federal Region IX and is supported by matching grants from the U.S. Department of Transportatmn, the California Department of Transportation (Caltrans), and the University. Based on the(More)
Wireless sensor networks are composed of a number of sensors probing their surroundings and disseminating the collected data to a gateway node for processing. Numerous military and civil applications have emerged over the last few years for wireless sensor networks. In many of these applications, sensors and gateways are placed in harsh environments.(More)
In wireless sensor networks, sensor readings are gathered at a gateway for processing and forwarding to a remote commend center. The closeness of the gateway to potentially dangerous events, e.g. fires, exposes it to damage and thus risks making the network dysfunctional. Recently, we have introduced SAFER (safety-aware relocation); a novel approach for(More)