Performing security analysis on a computer program under test. The speed integration compensation low-pass filter has a transfer function corresponding to a delay of a speed control system. Electrodes are preferably positioned along an interior or exterior of a tube-shaped component to administer electromagneticelectric pulses to a solution comprising a microbe. Accordingly, the light emitted into the light guiding plate could be prevented from being reflected by the flexible substrate directly and presenting the same color with the flexible substrate.