A device that trains a martial artist to kick. This invention also provides a method of using this model to screen compounds that can reduce aberrant immune activity including aberrant immune complex formation aberrant immune complex clearance and immune complex induced inflammation. A magnetic lever arm is pivotally coupled to the core and biased toward its slot. The gas supply supplies a gas flow into the space. By carrying out the reaction using an alkali hydroxide as sole base in the reaction system, the desired prostaglandin derivative can be obtained by simple procedures and with high yield. The apparatus includes a predistortion unit for predistorting an input complex digital signal based on a look up table LUT implementation and outputting a predistorted complex signal; and a power amplifier for amplifying the predistorted signal and outputting an amplified complex signal.