A method and system for diagnosing the effectiveness of a treatment on a porous material. The front end automation system interacts with a caller in order to recognize a request of the caller and determine a response to the request. Accordingly, an LCD backlight for uniform light distribution on an LCD as well as low power consumption and high durability can be manufactured using the light emitting device. Therefore, an e-mail server can have a security technique and handle abnormal e-mail in a step before operation of a spam filter server or an antivirus server. In the inverter apparatus which converts a DC voltage into an AC voltage, a semiconductor device for electric power conversion, and a drive and protection circuit which drives and protects this semiconductor device for electric power conversion, and a power supply circuit which supplies power to this drive and protection circuit are integrated in the same module.