Direction finding is an important component of Electronic Warfare (EW) system. The direction finding precision may directly affect signal sorting, identification, location and jamming decision etc.
METHODS: Based on the military hospital information system, a system that can provide electronic drug directions was developed by establishing the database, collecting and sorting drug directions.
System of postal-zone codes (zip stands for "zone improvement plan") introduced in the U. S. in 1963 to improve mail delivery and exploit electronic reading and sorting capabilities.