计算机毕业设计钻具出入库自动检测系统毕业设计论文系-毕业论文.doc

英文原文：CHAPTER 1INTRODUCTION1.1WHAT IS RFID?RFID is an acronym for radio frequency identification, which is a wireless communication technology that is used to uniquely identify tagged objects or people. It has many applications. Some present-day examples include:Supply chain crate and pallet tracking applications, such as those being used by Wal-Mart and the Department of Defense (DoD) and their suppliersAccess control systems, such as keyless entry and employee identification devicesPoint-of-sale applications such as ExxonMobil’s SpeedpassAutomatic toll collection systems, such as those increasingly found at the entrances to bridges, tunnels, and turnpikesAnimal tracking devices, which have long been used in livestock manage-ment systems and are increasingly being used on petsVehicle tracking and immobilizersWrist and ankle bands for infant ID and securityThe applications don’t end there. In the coming years, new RFID applications will benefi t a wide range of industries and government agencies in ways that no other technology has ever been able.1.2 WHAT EXPLAINS THE CURRENT INTEREST IN RFID TECHNOLOGY?RFID is rapidly becoming a cost-effective technology. This is in large part due to the efforts of Wal-Mart and DoD to incorporate RFID technology into their supply chains.In 2003, with the aim of enabling pallet-level tracking of inventory, Wal-Mart issued an RFID mandate requiring its top 100 suppliers to begin tagging pallets and cases by January 1, 2005, with Electronic Product Code (EPC) labels. (EPC is the first worldwide RFID technology standard.) DoD quickly followed suit and issued the same mandate to its top 100 suppliers. Since then, Wal-Mart has expanded its mandate by requiring all of its key suppliers to begin tagging cases and pallets. This drive to incorporate RFID technology into their supply chains is motivated by the increased shipping, receiving, and stocking efficiency and the decreased costs of labor, storage, and product loss that pallet-level vi