James Stewart

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The layout of large scenes can be a time–consuming and tedious task. In most current systems, the user must position each of the objects by hand, one at a time. This paper presents a constraint–based automatic placement system, which allows the user to quickly and easily lay out complex scenes. The system uses a combination of automatically– generated(More)
We present empirical studies that consider the effects of stereopsis and simulated aerial perspective on depth perception in translucent volumes. We consider a purely absorptive lighting model, in which light is not scattered or reflected, but is simply absorbed as it passes through the volume. A purely absorptive lighting model is used, for example, when(More)
—It is widely known that real nonminimum phase zeros lead to step response undershoot, and that the size of the undershoot necessarily tends to infinity as the settling time tends to zero. In this note, we show that the presence of two or more real nonminimum phase zeros can lead to step response overshoot in addition to undershoot. A lower bound on the(More)
OBJECTIVE To examine how the pre-existing doctor-patient relationship predicts conceptually distinct service use within an Interactive Cancer Communication System (ICCS) for underserved women with breast cancer and in turn how service utilization influences the doctor-patient relationship. METHODS Study sample included 231 recently diagnosed, lower income(More)
S ince publication of the AAAS 1989 report " Science for all Americans " (1), commissions, panels, and working groups have agreed that reform in science education should be founded on " scientific teaching, " in which teaching is approached with the same rigor as science at its best (2). Scientific teaching involves active learning strategies to engage(More)