Using data from the 2001-2005 waves of the Household, Income and Labour Dynamics in Australia survey, and taking account of existing estimates of ability bias and social returns to schooling, I estimate the economic return to various levels of education. Raising high school attainment appears to yield the highest annual benefits, with per-year gains as high as 30 percent (depending on the adjus...

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] ...

This paper describes the structure of three ~pes of parallel robots and compares their performances in the sense of size and static forces. The motivation for this investigation is to construct a robot that best ~ts a given medical application. The requirements are to cover a given work volume with a given orientation and to maintain the robot within the smallest cube possible. Among the struct...