The radio frequency identification is a kind of new-type automatic identification technology.It has many characteristics such as being strong reliability,convenient,swift and safe.Aiming at the problems existing in managing the district,the RFID technology is applied in district entrance guard system,which improves the science and the reliability of the system.In this paper,the work principle of the RFID,the structures of the system and its implementation are introduced.

The variable voltage variable frequency system (VVVF for shorten) of the induction motor, in which the Module DSP56 F8346 and IR2136 were applied as core of this control system, was introduced. Also, the hardware frame and software flowchart and their functions were presented .

作为长江中游最重要的两大城市群以及中部地区发展最具潜力的区域,武汉城市圈与长株潭城市群都是具有一定规模的城市综合体,具备合作发展的空间基础。两个城市群内部基础设施良好,发展迅速,具有较强的区域聚集功能和辐射能力。如果两者强强联合、共同建设试验区将有利于推动两大城市群自身的建设,有助于双方共享区域发展的规模效益,进而促进中部地区崛起,实现区域经济协调发展,推动国民经济快速健康的发展。同时,武汉城市圈和长株潭城市群现阶段的联动发展实践及其未来走势,对中部地区乃至对全国区域经济发展,将具有很强的现实意义。