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We carried out three experiments designed to compare the effects of relative and absolute size on manual prehension and manual estimates of perceived size. In each experiment, right-handed subjects were presented with two different-sized 3-D objects in a virtual display and were instructed to pick up or estimate the size of one of them. In Experiment 1,(More)
We examined the effect on manual prehension of introducing a 5-s delay between viewing a target object and initiating a grasping movement. Subjects were tested in four conditions: three involved grasping the object and a fourth involved estimating its size. In the main experimental condition (Open Loop Delay), subjects viewed a target object for 300 ms, but(More)
It has been repeatedly demonstrated that the opening between the index finger and thumb (grasp component) during an object-directed reach-to-grasp movement achieves maximum aperture approximately two-thirds of the way through the duration of the reaching movement (transport component). Here we offer a quantitative model of the temporal coupling between grip(More)
Virtual Reality (VR) simulators can offer alternatives for training procedures in the medical field. Most current VR simulators consider single-node contact for interacting with an object to convey displacement and force on a discrete mesh. However, a single-node contact does not closely simulate palpation, which requires a surface made of a multi-node(More)
Modern multislice computed tomography (CT) scanners produce isotropic CT images with a thickness of 0.6 mm. These CT images offer detailed information of lung cavities, which could be used for better surgical planning of treating lung cancer. The major challenge for developing a surgical planning system is the automatic segmentation of lung lobes by(More)
Microbes frequently live within multicellular, solid surface-attached assemblages termed biofilms. These microbial communities have architectural features that contribute to population heterogeneity and consequently to emergent cell functions. Therefore, three-dimensional (3D) features of biofilm structure are important for understanding the physiology and(More)
PURPOSE The major hurdle for three-dimensional display of lung lobes is the automatic recognition of lobar fissures, boundaries of lung lobes. Lobar fissures are difficult to recognize due to their variable shape and appearance, along with the low contrast and high noise inherent in computed tomographic (CT) images. An algorithm for recognizing the major(More)
  • Dane Bertram, Supervisor, Saul Greenberg, Co-Supervisor, Robert Walker, Jonathan Sillito +2 others
  • 2009
Issue tracking systems help organizations manage issue reporting, assignment, tracking, resolution, and archiving. Traditionally, issue tracking systems have been largely viewed as simple data stores where software defects are reported and tracked as " bug reports " within an archival database. Yet, as issue tracking is fundamentally a social process, it is(More)