摘要：Traditional parafoil homing usually uses a point as object. As the mobility of parafoil is limited by its glide ratio and wind, in some cases when the parafoil scatter area is large, or the glide ratio of parafoil is small, the deviation of its landing point to object point will be arduous to control. Accordingly, during these situations, when parafoil is used in recovery of spacecraft or satellite, the landing area of parafoil can be set as a rectangle, and the object of parafoil can be set as a line segment. The thesis of this work is designing an algorithm for parafoil homing using line segment as object. The algorithm of wind velocity and direction calculation in different flying segments was also investigated. The algorithm designed navigates the parafoil to land into the predestined area and largely reduce the probability of recovery loads falling to unwanted area to damage houses and people.

摘要：以软交换为核心的通信网络是未来通信发展的必然趋势。软交换设备的安全性备受关注,将关系该技术的实际应用进程,文章旨在讨论软交换设备应用层的安全策略,通过软交换“双归属”技术的跟踪和研究,对软交换网络中所涉及的安全机制进行探讨和分析。