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The confusion matrix of using a virtual classifier to recognize the real activity; (a) the results of Case 1; used positions are chest, right lower leg, and left lower leg; (b) the results of Case 2; the sensor positions are left lower leg-left and left upper leg-left; and (c) the results of Case 3; two sensor boards are used, i.e., the location number of [0, 1, 2, 3, 4] and [5, 6, 7, 8, 9].
