Methods and systems for degrading oil sludge are disclosed. The two image sensing modules have partially overlapped field of views and the partially overlapped field of views is for defining a touch region. Preferably the precursor gas is chosen from a group of compounds having a sticking coefficient that is between 0. A first proxy server serving the first endpoint communicates with an ENUM server to convert a directory number corresponding to the second endpoint to a network address. The resistor is connected in series with the output side line.