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Africa
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Turing, Androids and a Travel Holiday: A Futuristic View of Synthetic Worlds
Published in C.A.P. Smith, Kenneth W. Kisiel, Jeffrey G. Morrison, Working Through Synthetic Worlds, 2009
Robert Cox, Patricia Crowther, John Campbell
Internet and bandwidth We envisage browser plug-ins will exist to make the transition from the 2D internet to the 3D internet more accessible. This is the approach taken by Google with Lively (www.lively.com) and also ExitReality (www.exitreality.com). We see value in a project to incorporate the Second Life (or OpenSim) client as a plug-in to conventional internet browsers.
Validation of a model-based inverse kinematics approach based on wearable inertial sensors
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2018
L. Tagliapietra, L. Modenese, E. Ceseracciu, C. Mazzà, M. Reggiani
This study proposes a model-based Inverse Kinematics (IK) approach to assess the motion of multi-link systems from the orientation of IMUs placed on the constituting bodies. In this approach, the joint constraints included in the model have to be respected when calculating joint kinematics (Lu and O’Connor 1999). General applicability and ease of use motivated the choice of using IMU orientations as input for the developed methodology, even if potentially affected by the inaccuracies previously described, instead of raw sensor data. Furthermore, the proposed approach has been implemented to be model-independent, allowing users to select the most appropriate kinematic model (lower limb, upper limb, spine, etc.) according to their specific needs. Moreover, since musculoskeletal models are essentially chains of rigid bodies, the use of robots or limb-like mechanisms reduces the effects of non-methodological sources of errors when the focus is the assessment of the performances of a new IK approach. In this study, the proposed approach to calculate joint angles from IMUs was evaluated in two experimental scenarios, using respectively a robot and a passive plastic planar mechanism. This choice allows evaluating the proposed methodology without the confounding effect of errors that would have been present in human testing, e.g. soft tissue artifacts, and led to the design of ad hoc test-benches. The developed orientation-based IK is freely available as a plug-in for OpenSim (Delp et al. 2007) at the SimTK project’s page1.