An image correction device for use in a pattern inspection apparatus is disclosed, which has automatic adaptability to variations in density of a pattern image of a workpiece being tested. The method includes executing the application. The recess is adapted to center and support the projectile. The brownie also includes a session identifier that uniquely identifies session with the user of the application session. In example embodiments of the invention, a method comprises: transmitting a wireless message including a list of one or more wireless devices, from which a response is not desired; and receiving zero or more responses from one or more other wireless devices that are not on the list. The search unit is adapted for generating a second voltage signal on the basis of the forcing parameter signal and the first voltage signal received and to apply the second voltage signal to the intermediate voltage point.