Abstract: A biosensor system determines analyte concentration from an output signal generated from a light-identifiable species or a redox reaction of the analyte. The biosensor system compensates at least 50% of the total error in the output signal with a primary function and compensates a portion of the remaining error with a residual function. The amount of error compensation provided by the primary and residual functions may be adjusted with a weighing coefficient. The compensation method including a primary function and a residual function may be used to determine analyte concentrations having improved accuracy from output signals including components attributable to error.

Abstract: A spherical chair structure includes: a chair frame having a seat frame and an arc containing space in the seat frame; a cushion installed on the seat frame and including a spherical mat, and the bottom of the spherical mat being contained in the containing space, and the spherical mat being protruded from the seat frame to form a seat pad; and a positioning device having a plurality of binder for surrounding and positioning the spherical mat, and an end of the binder being fixed to the chair frame, so that the spherical chair can be used as a chair and a fitness equipment safely and comfortably to provide excellent leisure and fitness exercises. The spherical chair structure can be packed with less packaging material and transportation space to achieve the effects of reducing the transportation cost and protecting our environment.