Role-Based Access Control models are currently considered as the most effective approach for engineering access control systems. In this paper we experiment their application in the context of Multi-Agent Systems (MAS), by discussing the design of an access control system with an agent-oriented methodology such as SODA. In particular, we show how a clear separation between mechanisms and polici...

BACKGROUND The purpose of this study is to evaluate the effect of casein phosphopeptide amorphous calcium phosphate (CPP-ACP) and CPP-ACP with fluoride (CPP-ACP-F) on the shear bond strength (SBS) of orthodontic brackets bonded with two different adhesive systems. METHODS One hundred twenty-six human premolar teeth were selected. One hundred twenty teeth were used for SBS testing, and six tee...

This paper proposes a purpose-based framework for supporting privacy preserving access control policies and mechanisms. The mechanism enforces access policy to data containing personally identifiable information. The key component of the framework is purpose involved access control models (PAC) that provide full support for expressing highly complex privacy-related policies, taking into account...

Although several access control policies can be devised for controlling access to information, all existing authorization models, and the corresponding enforcement mechanisms, are based on a speciic policy (usually the closed policy). As a consequence, although diierent policy choices are possible in theory, in practice only a speciic policy can be actually applied within a given system. Howeve...

This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. In-situ ambient quantification of monoterpenes, sesquiterpenes, and related oxygenated compounds during BEARPEX 2007 – implications for gasand particle-phase chemistry N. C. Bouvier-Brown, A. H. Goldstein, J. B. Gilman, W. C. ...

Role-based access control has been a focal area for many security researchers over the last decade. There have been a large number of models, and many rich specification languages. However there has been little attention paid to the way in which access control policy is stored persistently. This paper investigates policy storage from the perspective of access control to the policy itself, and o...

Artificial agents are often trained to perform non-Markovian tasks, i.e., tasks in which the sensory inputs can be ambiguous. Agents typically learn how to perform such tasks using either reinforcement learning (RL) or evolutionary learning (EL). In this paper, we empirically demonstrate that these learning methods result in different levels of performance when applied to a non-Markovian task: ...

OBJECTIVE The effect of acupuncture (ACP) on regional cerebral blood flow (rCBF) is unclear. Single-photon emission computed tomography studies on three patients with dystonia were performed before and after ACP treatment to test the contention that ACP affects rCBF. METHODS Pre-ACP and post-ACP CBF study were performed on the same day; 99mTc ethyl cysteinate dimer was injected for each study...

Access control is one of the fundamental security mechanisms in information systems. When a multi-user system uses XML documents as data storage, the need of access control to XML documents arises. Due to the hierarchical structure, XML access control is finegrained in nature. For this criterion, instead of controlling access to the whole XML document, it is possible to limit user access to sub...