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Service-Oriented Architecture (SOA) provides a flexible architecture for service composition. Service composition can be integrated by atomic Web services developed independently by their providers. With increasing number of alternative services that implement similar functionality but provide different non-functional (QoS) characteristics, service composition becomes a service selection problem....
Delay and Tolerant Networks (DTNs) have been proposed to address data communication challenges in network scenarios, where no instantaneous end-to-end path is guaranteed because of frequent and long duration network partitions. Typical protocols forward a message to multiple nodes to improve message delivery rate. However, a large number of replications consume many system resources that are quite...
This paper introduces the software implementation of a hybrid methodology for probabilistic risk assessment (PRA) of complex systems. The software, called IRIS (Integrated Risk Information System) combines a user-friendly graphical interface with a powerful computational engine. The framework includes a multi-layered modeling approach, combining Event Sequence Diagrams, Fault Trees, and Bayesian Belief...
Simulation of dynamic complex systems-specifically, those comprised of large numbers of components with stochastic behaviors-for the purpose of probabilistic risk assessment faces challenges in every aspect of the problem. Scenario generation confronts many impediments, one being the problem of handling the large number of scenarios without compromising completeness. Probability estimation and consequence...
There are two major problems of unstructured P2P systems, one is their heavy network traffic; the other is the problem of unpredictable delay. The popular search techniques in unstructured P2P networks such as flooding, dynamic query don't deal with these problems efficiently for they are lack of heuristic. In this paper, we proposed a new search algorithm, called immune based search (IBS) algorithm,...
Software plays an increasingly important role in modern safety-critical systems. Although, research has been done to integrate software into the classical probabilistic risk assessment (PRA) framework, current PRA practice overwhelmingly neglects the contribution of software to system risk. Dynamic probabilistic risk assessment (DPRA) is considered to be the next generation of PRA techniques. DPRA...
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