Here we propose a real-time method for low-drift odometry andmapping using rangemeasurements from a 3D laser scanner moving in 6-DOF. The problem is hard because the range measurements are received at different times, and errors in motion estimation (especially without an external reference such asGPS) causemis-registration of the resulting point cloud. To date, coherent 3D maps have been built...

Intra-operative Ultrasound imaging as a real time imaging device is found very applicable for intraoperative updates of patient data in neurosurgery. One of the main challenges here is the accuracy of intra and preoperative image registration which is highly influenced by the level of speckle reduction and the accuracy of segmentation method. In this paper the effect of segmentation method on t...

the effects of including incoherent (bound-electron) and coherent (rayleigh) scattering in exposure buildup factor calculations for point isotropic gamma ray sources, penetrating a two-layer water-lead shield have been investigated in the gamma ray energy (e?) range of 40 kev to 3 mev. incoherent scattering decreases the values of these factors in both layers up to e? ~ 200 kev and the effect i...

[1] The Scandinavian Twin Auroral Radar Experiment (STARE) coherent radar system measures the Doppler shifts caused by 1 m plasma waves in the high-latitude E region ionosphere. These Doppler velocities are here related to the electron drift velocity and ion acoustic velocity derived from measurements with the incoherent radar system European Incoherent Scatter (EISCAT). The Doppler velocity is...

In 2003 many organizational problems within NASA were cited by the Columbia Investigation Board (CIB) as contributing to the Columbia disaster. Among the problems cited were barriers to communication, including information technologies, structural integration and databases, ineffective leadership and practical drift. Structural integration is assembling interdependent actions into coherent sequ...

Strong electrostatic turbulence in magnetically confined plasmas is characterized by trapping or eddying of particle trajectories produced by the E × B stochastic drift. Trapping is shown to produce strong effects on test particles and on test modes by causing nonstandard trajectory statistics: non-Gaussian distribution, memory effects, and coherence. Trapped trajectories form quasi-coherent st...