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Within an embodied cognition framework, it is argued that presence in a virtual environment (VE) develops from the construction of a spatial-functional mental model of the VE. Two cognitive processes lead to this model: the representation of bodily actions as possible actions in the VE, and the suppression of incompatible sensory input. It is hypothesized(More)
It has long been argued that the possibility to interact in and with a virtual environment (VE) enhances the sense of presence. On the basis of a three-component model of presence, we specify this hypothesis and argue that the mental representation of possible actions should especially enhance spatial presence, and to a lesser extent the involvement and(More)
Reasoning about key escrow protocols has increasingly become an important issue. The Escrowed Encryption Standard (EES) has been proposed as a US government standard for the encryption of un-classiied telecommunications. One unique feature of this system is key escrow. The purpose of key escrow is to allow government access to session keys shared by EES(More)
The possible beneficial effects of added calcium ions to contrast media to diminish myocardial toxicity was evaluated in 93 cardiac catheterizations with cardioangiography, performed in 50 children and adolescents. Two contrast media with equal iodine content (370 mg/ml) and similar physical properties were used: Isopawue-370, containing 0.34 mg calcium/ml,(More)
The ferrous iron transporter FeoB is an important factor in the iron metabolism of many bacteria. Although several structural studies have been performed on its cytosolic GTPase domain (NFeoB), the full-length structure of FeoB remains elusive. Based on a crystal packing analysis that was performed on crystals of NFeoB, a trimeric structure of the FeoB(More)