A method of manufacturing a flash memory device by carrying out the process of shallow trench isolation in a memory cell region, so that it decreases an aspect ratio of pattern by forming a field isolation film so as to reduce gap-filling defects due to high density plasma and to prevent the smiling effect at a tunnel oxide film so as to improve a programming speed of the flash memory device. The coil and electronic switching circuit are mounted within a coil box module that replaces four original induction coils within the coil box. The system also includes a drive component connected to the sensor and is configured to simultaneously generate a plurality of drive signals to simultaneously drive the sensor. To meet the above and other objectives, the present invention provides a preform for a glass ferrule, comprising two holes which are formed through the preform and exit out both side cross-sections of the preform, wherein the two holes are symmetrical to the center in a diameter direction of the preform and a distance between the two holes changes in a lengthwise direction of the preform. The element is preferably formed by compressing an amount of loose particles of one or several solid combustible materials, such as among others wood waste and sawdust, without adding any binding agent. In the method, the UE receives a paging identifier indicating whether or not a paging message to be transmitted to the user equipment is present and receives the paging message including a type indicator indicating a paging type, according to the paging identifier.