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To increase the assurance with which agents can be deployed in operational settings, we have been developing the KAoS policy and domain services. In conjunction with Nomads strong mobility and safe execution features, KAoS services and tools allow for the specification, management, conflict resolution, and enforcement of DAML-based policies within the(More)
Information visualization has been a research topic for many years, leading to a mature field where guidelines and practices are well established. Knowledge visualization, in contrast, is a relatively new area of research that has received more attention recently due to the interest from the business community in Knowledge Management. In this paper we(More)
The most challenging aspect of constructing a concept map is not coming up with the list of concepts to include, but linking the concepts into meaningful propositions to create a coherent structure that reflects the person's understanding of a domain. We present an algorithm which, during the process of concept mapping, takes the partially constructed map(More)
Electronic concept mapping tools empower experts to play an active role in the knowledge capture process, and provide a medium for building richly connected multimedia <i>knowledge models---</i>sets of linked concept maps and resources about a particular domain. Knowledge models are intended to be used as a means for sharing knowledge among humans, not as(More)
The construction of a concept map consists of enumerating a list of concepts and —a more difficult task— determining the linking phrases that should connect the concepts to form meaningful propositions. Appropriate word selection, both for concepts and linking phrases, is key for an accurate knowledge representation of the user's understanding of the(More)
The macrocognitive workplace is constantly changing, and a work system can never match its environment completely; there are always gaps in fitness because the work is itself a moving target. This article looks at a domain where the workplace is a moving target in three ways: cyberdefense. New technology and work methods are continually being introduced,(More)
One of the criticisms of traditional security approaches is that they present a static target for attackers. Critics state, with good justification, that by allowing the attacker to reconnoiter a system at leisure to plan an attack, defenders are immediately disadvantaged. To address this, the concept of moving-target defense (MTD) has recently emerged as a(More)
In applied sciences there is a tendency to rely on terminology that is either ill-defined or applied inconsistently across areas of research and application domains. Examples in information assurance include the terms resilience, robustness and survivability, where there exists subtle shades of meaning between researchers. These nuances can result in(More)
Safety and efficiency are primary concerns in chemical processing facilities, though the complexity of many such systems often makes it difficult for operators to detect abnormal conditions before they compromise throughput or become hazardous. In this paper, we report initial results from the application of multi-agent systems to monitor complex chemical(More)