A capacitor charging circuit and method including a plurality of serially connected capacitors and parallel monitor circuits connected in parallel on a one-to-one basis to the capacitors. A source gas containing oxygen is provided into a discharge space in which the discharge is produced to generate ozone by the action of the discharge. The bump structure includes a metal pillar, a metal cap layer on the metal pillar, a metal insertion layer on the metal cap layer, and a solder layer on the metal insertion layer. The user receives a list of vehicles proximate the location selected by the user, and an indication of available times for each of the vehicles.