Abstract: A system may include a calibration module that measures a range of limb and trunk movements made by a human subject during a calibration phase of the system. A customization module may customize pre-determined performance criteria based on the measured range of limb and trunk movements. An activity task presentation module may present an activity task to the human subject for performance during an activity phase. An activity assessment module may assess the human subject's performance of that activity task during the activity phase based on the pre-determined performance criteria.

Abstract: A grinding machine includes a casing with a top plate unit, two grinding units installed on the top plate unit, and a driving unit for activating the grinding units. The top plate unit has a dust inlet slot formed therethrough so as to permit dropping of dust from the corresponding grinding unit into the dust inlet slot. The casing has two side chambers communicated with the dust inlet slots, and a middle chamber which is located between the side chambers and which receives a filtering unit therein. A dust-collecting chamber is located in a bottom portion of the casing and is communicated with the side chambers and the middle chamber. An exhaust fan unit is disposed in the middle chamber and is located over the filtering unit to draw dust from the dust-collecting chamber in order to discharge the same from the casing.