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This paper describes algorithms for the animation of men and women performing three dynamic athletic behaviors: running, bicycling, and vaulting. We animate these behaviors using control algorithms that cause a physically realistic model to perform the desired maneuver. For example, control algorithms allow the simulated humans to maintain balance while(More)
The hybrid magnetic resonance (MR)/X-ray suite (XMR) is a recently introduced imaging solution that provides new possibilities for guidance of cardiovascular catheterization procedures. We have previously described and validated a technique based on optical tracking to register MR and X-ray images obtained from the sliding table XMR configuration. The aim(More)
Virtual environments and games often include animated characters that must respond to the actions of the user. The unpredictable actions of the user require a highly interactive environment that is not amenable to motion generation techniques based on a library of predeened sequences. In this paper, we present one approach to populating interactive virtual(More)
The recent finding of neuronal degeneration in the nucleus basalis of Meynert (nbM) in Alzheimer's disease suggests a possible role of this nucleus and the cholinergic system in dementing illness. We assessed neuronal population and density in two anatomical levels of the nbM in 38 coded brains from patients with a broad variety of neurological disorders.(More)
Simulation composability has been much more difficult to realize than some initially imagined. We believe that success lies in explicit considerations for the adaptability of components. In this paper we show that the complexity of optimal component selection for adaptable components is NP-complete. However, our approach allows for the efficient adaptation(More)
OBJECTIVE A collaborative study was conducted to develop methods for surveys of mental disorder and service utilization in unscreened population-based samples of children and adolescents. METHOD Probability household samples of youths 9 through 17 years of age were selected at four sites and interviews were conducted with a total of 1,285 pairs of youths(More)
Pedestrian navigation is a complex function of human dynamics, a desired destination, and the presence of obstacles. People cannot stop and start instantaneously and their turning abilities are influenced by kinematic and dynami-cal constraints. A realistic model of human walking paths is an important development for entertainment applications and many(More)
Birds, sh, and many other animals are able to move gracefully and eeciently as a herd, ock, or school. We would like to reproduce this behavior for herds of arti-cial creatures with signiicant dynamics. This paper develops an algorithm for grouping behaviors and evaluates the performance of the algorithm on two types of systems: a full dynamic simulation of(More)