Medical management of the dying process has been part of American culture for approximately 150 years. Initially, physicians could do little besides ease the dying process by making the moribund person comfortable, comforting the surrounding loved ones, and perhaps orchestrating any rituals. The patient could not linger long, as infectious diseases and other lethal conditions generally took the...

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Modeling information security policies is an important problem in many domains. This is particularly true in the health care sector where information systems often manage sensitive and critical data. This paper proposes to use non-monotonic reasoning systems to control access to sensitive data in accordance with a security policy. In the first part of the paper, we propose an access control mod...

C-O Diagrams have been introduced as a means to have a visual representation of normative texts and electronic contracts, where it is possible to represent the obligations, permissions and prohibitions of the different signatories, as well as what are the penalties in case of not fulfillment of their obligations and prohibitions. In such diagrams we are also able to represent absolute and relat...

Using resource-monitoring data from seven protected areas, the effectiveness of three campfire policies-campfire ban, designated campfires, and unregulated campfires-were assessed based on the number of fire sites and the amount of tree damage. Results indicate that unregulated campfire policies permitted substantial numbers of fire sites and tree damage in campsites, although fire bans did not...

1 While current and emergent applications become more and more complex, most of existing security policies and models only consider a yes/no response to the access requests. Consequently, modelling, formalizing and implementing permissions, obligations and prohibitions do not cover the richness of all the possible scenarios. In fact, several applications have access rules with the recommendatio...