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Abstract. This paper presents various procedures that can be used in order to numerically evaluate what the maximum Z−width that can be rendered by a mobile haptic interface will be given few parameters that characterize the haptic device and the mobile platform that make up such interface. Such procedures are applied to the case of two different mobile haptic interfaces. Results are encouraging, even though limitations to the proposed procedure exist.

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The precautionary principle (PP) has been proposed as the proper guide for the decision-making criteria to be adopted in the face of the new catastrophic risks that have arisen in the last decades. This article puts forward a workable definition of the PP based on the so-called alpha-maximin expected utility approach, applying it to the possible outbreak of the avian flu disease among humans. Moreover, it shows how the shortage and/or lack of effective drugs against the infection of the virus A(H5N1) among humans can be considered a precautionary failure.