第四章对鞍钢设计院开展的设计师分级管理机制进行实证分析，在分析其存在问题的基础上，提出改进措施。
Chapter four analyzes the real example of the designers'levels management system in Anshan Iron and Steel Corporation, and raises the problems existed in it, then propose improving the measure.
通过对城市轨道交通数字视频监控系统的介绍，分析其存在问题和解决方案，探讨了城市轨道交通数字视频监控系统的发展前景。
Through the introduction of Digital Video supervision system in Metro system, the paper analyzes some existing problems and gives corresponding solutions.
本文综述了天蚕素抗菌肽的结构、来源、生物作用，重点介绍了天蚕素抗菌肽的应用，并对其存在的问题和未来发展前景进行分析。
This paper reviews the structure, source, biological function of cecropins and their application in plants and animals, and discuses their existing problems and perspectives.
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