The present disclosure introduces a simple method and apparatus for converting DC power to AC power, and, specifically, to single-ended inverter circuits for driving discharge lamps such as a Cold Cathode Fluorescent Lamp or an External Electrode Fluorescent Lamp. Nonvolatile memory, such as flash ROM, for program storage has a first program area to which program data transmitted from a personal computer is to be written and a second program area storing a write control program. Thus, by supposing that a failure in the authentication occurs, and by causing the user side to present the data to indicate own legitimacy for the authentication information manager, the currently valid authentication information is distributed, for example, after the encryption. A securement ring midway between opposite strap ends engages the stationary fitting so that the strap and glove are properly aligned, mounted, and retained on the housing. The set of energy components is propagated or migrated through the lens elements to form image components which are combined into a seismic image. The MM identifies when a particular user image is, or is not, in use and conveys this information to the administrative blade.