Novel sulfuric acid, methanesulfonic acid, p-toluenesulfonic acid, 2-naphthalenesulfonic acid, hydrochloride acid, or benzenesulfonic acid salts of substituted 8-arylquinolines, wherein the aryl group at the 8-position contains a substituent substituted-alkenyl group, are PDE4 inhibitors. In a line patterning process for forming a bit-line in a DRAM of a semiconductor device, a barrier metal layer and a tungsten layer are sequentially formed on an interlayer insulating film comprising a contact hole to fill the contact hole by a CVD method. In this way, coordinates of a pointing device employing ultrasonic wave can be obtained with less error variation. The sensor interface circuit also includes a monitoring module for receiving the analog sensor signal and generating the digital sensor signal in response thereto. Applications include holding an integrated circuit device in reset until power supplies have reached functional voltage levels.