An accurate initial alignment must be required for inertial navigation system (INS). The performance of initial alignment directly affects the following navigation accuracy. However, the rapid convergence of meridians and the small horizontalcomponent of rotation of Earth make the traditional alignment methods ineffective in polar regions. In this paper, from the perspective of global inertial ...

The purpose of this study was to compare two clinical immobilization systems for intracranial frameless stereotactic radiosurgery (fSRS) under the same clinical procedure using cone-beam computed tomography (CBCT) for setup and video-based optical surface imaging (OSI) for initial head alignment and intrafractional motion monitoring. A previously established fSRS procedure was applied using two...

This paper describes the first results and preliminary analysis obtained with several alignment monitoring systems recently installed in the PEP-II interaction region. The hydrostatic level system, stretched wire system, and laser tracker have been installed in addition to the existing tiltmeters and LVDT sensors. These systems detected motion of the left raft, which correlated primarily with t...

A ground motion model based on geo-physical arguments is presented. The purpose of this model is to predict possible beam separation in the interaction regions of the LHC due to ground motion developing in time spans in the order of seconds to hours. Although this model can also be used to predict statistical movement of accelerator objects on a larger time scale (yearly alignment) its usefulne...

stability and performance are two main issues in motion of bipeds. to ensure stability of motion, a biped needs to follow specific pattern to comply with a stability criterion such as zero moment point. however, there are infinity many patterns of motion which ensure stability, so one might think of achieving better performance by choosing proper parameters of motion. step length and step perio...

Study design: In-vitro biomechanical study. Objective: To characterize cervical TDR kinematics above 2-level fusion, and to determine the effect of fusion alignment on TDR response. Summary of Background Data: Cervical total disc replacement (TDR) may be a promising alternative for a symptomatic adjacent level after prior multi-level cervical fusion. However, little is known about the TDR kinem...