A method for implementing virtual metal fill includes obtaining a layout record for a circuit design, and inserting metal fill data into the layout record based on one or more rules, wherein the metal fill data represents a consolidation of actual metal fill. The brake pads are received on back plates or other pad support. The switching frequency signal is generated by inputting a modulation frequency to a pulse width modulation circuit. The server reads the requested personal information from the user profile database and transfers the personal information to the service provider device. The invention similarly relates to redispersible powders that may be obtained by drying the said latices. The resin-packaging step includes forming a plurality of mutually separated resin packages each of which collectively seals at least two sets of light emitting elements and light receiving elements.