144,034 research outputs found
Holographic laser Doppler imaging of pulsatile blood flow
We report on wide-field imaging of pulsatile motion induced by blood flow
using heterodyne holographic interferometry on the thumb of a healthy
volunteer, in real-time. Optical Doppler images were measured with green laser
light by a frequency-shifted Mach-Zehnder interferometer in off-axis
configuration. The recorded optical signal was linked to local instantaneous
out-of-plane motion of the skin at velocities of a few hundreds of microns per
second, and compared to blood pulse monitored by plethysmoraphy during an
occlusion-reperfusion experiment.Comment: 5 pages, 5 figure
Recent advances on recursive filtering and sliding mode design for networked nonlinear stochastic systems: A survey
Copyright © 2013 Jun Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Some recent advances on the recursive filtering and sliding mode design problems for nonlinear stochastic systems with network-induced phenomena are surveyed. The network-induced phenomena under consideration mainly include missing measurements, fading measurements, signal quantization, probabilistic sensor delays, sensor saturations, randomly occurring nonlinearities, and randomly occurring uncertainties. With respect to these network-induced phenomena, the developments on filtering and sliding mode design problems are systematically reviewed. In particular, concerning the network-induced phenomena, some recent results on the recursive filtering for time-varying nonlinear stochastic systems and sliding mode design for time-invariant nonlinear stochastic systems are given, respectively. Finally, conclusions are proposed and some potential future research works are pointed out.This work was supported in part by the National Natural Science Foundation of China under Grant nos. 61134009, 61329301, 61333012, 61374127 and 11301118, the Engineering and Physical Sciences Research Council (EPSRC) of the UK under Grant no. GR/S27658/01, the Royal Society of the UK, and the Alexander von Humboldt Foundation of Germany
- …