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Overlay topologies are often used in unstructured peer-to-peer networks in order to improve the global performance. Various research works dealing with communication issues of dynamic networks gave much interest to overlay topologies to get a better network organization. In fact, the use of such structures aim to decrease the impact of network dynamics while improving its scalability. Moreover, overlays...
At a tactical level, insurgents planning attacks with Improvised Explosive Devices (IEDs) are constrained in their choice of target by the specific location of their safe house or weapons cache, the geographic context in which they operate, and the pattern of potential targets as it presents itself at a given time. Geographic profiling in law-enforcement already takes advantage of similar constraints...
This paper describes how software is able to autonomously adapt its security mechanisms based on knowledge from security ontology. Security adaptation is required because a software's environment changes during run-time. Thus, all security requirements cannot be defined beforehand. To achieve security adaptation, we have combined a security ontology that defines security mechanisms, security objectives,...
Numerous applications can be formulated as a resource allocation problem, which require a distributed solving method especially when dynamic environments are considered. According to such methods, a solution does not only consist in an optimal allocation, but needs a sequence of transactions leading from a given initial allocation to an optimal one. Up to now, studies have been based on ideal contexts...
Random scale-free overlay topologies provide a number of properties like for example high resilience against failures of random nodes, small (average) diameter as well as good expansion and congestion characteristics that make them interesting for the use in large-scale distributed systems. A number of these properties have been shown to be influenced by the exponent of their power law degree distribution...
Many large-scale distributed systems have been built with great complexity to run Internet services. Due to the heterogeneity and dynamics of complex systems, it is very difficult to characterize their behavior precisely for system management. While we collect large amount of monitoring data from distributed systems as system observables, it is hard for us to interpret the data without constructing...
In this paper we present a self-organizing emergent multi-agent system designed for the decentralized real time control of water distribution networks. The agents, which are associated with every pump, tank, and water tower of such a distribution network, interact by means of a decentralized coordination mechanism based on digital info chemicals. In particular, they utilize a biologically-inspired...
When introducing self-organization into a system, its developer aims to reduce the system's complexity, during development as well as during operation. More often than not, the self-organization mechanism is ingenious, highly tweaked for the system under construction and not reproducible or reusable by other developers or in other projects. This paper introduces a software engineering guideline for...
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