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Backbone networks are critical infrastructure that interconnect networks across cities, countries, and continents. Maintaining and expanding such networks is a progressive task as the number of network users increases. High capacity and availability are amongst the main objectives of backbone networks planning because they serve critical services in healthcare, business, and education. Disrupting...
Computer networks serve as critical infrastructure to services in business, health care, and education. Targeted attacks and random failures may cause link or node removals, which in turn can cause significant disruption to the availability of network services. Designing a network topology to provide acceptable levels of service in the face of these challenges can save both lives and money. A number...
Graph robustness metrics have been used largely to study the behavior of communication networks in the presence of targeted attacks and random failures. Several researchers have proposed new graph metrics to better predict network resilience and survivability against such attacks. Most of these metrics have been compared to a few established graph metrics for evaluating the effectiveness of measuring...
Improving resilience against failures and targeted attacks is an important aspect of network design. The resilience and cost of networks are two opposing objectives in which a designer should consider when building networks. We develop a heuristic algorithm that balances the centrality of networks by adding a set of links that minimizes the variance of graph centrality measures in a least costly fashion...
Exception handling mechanisms (EHM) were conceived as a means to improve maintainability and reliability of programs that have to deal with exceptional situations. Amongst the different implementations of built-in EHM, we classify them in two main categories: reliability-driven and maintenance-driven. Some programming languages, such as Java, provide built-in exception handling mechanisms that promote...
Unmanned aerial vehicles are increasingly being used in a variety of military missions. One such mission is that of Intelligence, Reconnaissance, and Surveillance. In these missions, unmanned aerial vehicles collect sensor data and communicate it to ground, air, and space assets to support decision-making. The ultimate purpose of the research reported in this paper is to define the requirements for...
The multimedia communication is rapidly converging towards Voice over Internet - commonly known as Voice over Internet Protocol (VoIP). Session Initiation Protocol (SIP) is the standard used for session signaling in VoIP. Crafty attackers can launch a number of Denial of Service (DoS) attacks on a SIP based VoIP infrastructure that can severely compromise its reliability. In contrast, little work...
Cycle life testing of smart power switches requires significant hardware effort to provide the required ohmic-inductive load patterns. A new reliability test system for research purposes is therefore introduced that generates arbitrary current waveforms to emulate inductive switching behavior. This allows flexible cycle stress testing of integrated power switches under arbitrary application conditions...
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