The present invention is directed to a new class of hydroxamic acid derivatives, their use as LpxC inhibitors and, more specifically, their use to treat bacterial infections. The power electronics module are operational to selectively provide either AC or DC power to desired distribution buses. The circuit is operable to detect resume signaling of a duration of less than one millisecond and to transition the first port from a first state corresponding to an idle state of the data lines to a second, enabled state in response to the resume signaling. When the timing signal is not present, the latency is longer than a timing delay which occurs between the timing system applying the timing signal to the logic block and the timing signal applying the logic signal to a next one of the logic blocks. Afterwards, the processing circuit calculates brightness difference between the brightness reference value and the column pixel brightness values corresponding to the dots of a curve segment of a brightness distribution profile obtained from a sensed image, so as to further calculate a gravity of the imaging range.