Ullman and Basri [1] have shown theoretically, that a three-dimensional object can be represented by a linear combination of two-dimensional images of the object. But they have applied their calculations to artificially created images only, like line drawings of cars. The application to images of real objects turns out to be difficult, because a crucial point of their algorithm is the knowlegde...

This article reports the findings of a small evaluation audit which compares the Dyna-Form Mercury Advance Mattress to that of the Softform Premier Active Mattress (a foam mattress with dynamic underlay). A small group of patients with similar co-morbidities who were an emergency admission were recruited to an evaluation audit. Their median age and Waterlow score indicated that these patients w...