In control of a linear collider, the ground motion is one of the big problems. Various things can be considered as a factor of the ground motion, environmental vibration, atmospheric pressure variation, and the earth tides, etc. This time, we measured the slow ground motions using the tunnel of the underground hydroelectric power station "Shintoyone" located in the granite region. For the follo...

purpose: regarding the high prevalence of low back pain in various communities and the need to determine an appropriate treatment plan for these patients, examining their functional limitation and disability level is of utmost importance. in this regard, one of the important indicators is lumbar range of motion. measurement of the range of motion is a common and appropriate method for determini...

In this study, a simple 2-D measurement system based on optical design was developed to measure the motion errors of the linear guideway. Compared with the transitional methods about the linear guideway for measuring the motion errors, our proposed 2-D optical measurement system can simultaneously measure horizontal and vertical running straightness errors for the linear guideway. The performan...

We report a portable 6-DOF (six degrees of freedom) motion tracking system which uses high-accuracy AR markers. It enables easy measurement of 6-DOF motion of multiple tracking points by a single camera. We examined the measurement accuracy of the motion tracker by comparing with an ordinary motioncapture system. The pose estimation errors are about 5 [mm] in location (depth) and about 2 [deg] ...

Due to the fact that there is no static reference point in ocean space, relative measurement sensors such as laser cannot be applied of ship motion. In order collect motion signal a more accurately, an absolute method for proposed. Firstly, acceleration heave direction obtained by using sensor; secondly, time–frequency domain integration algorithm used avoid problem quadratic trend item and inf...