Suchergebnisse

Unmanned Aerial Vehicles (UAVs) have become necessary tools for a wide range of activities including but not limited to real-time monitoring, surveillance, reconnaissance, border patrol, search and rescue, civilian, scientific and military missions, etc. Their advantage is unprecedented and irreplaceable, especially in environments dangerous to humans, for example, in radiation or pollution-exposed areas. Two path-planning algorithms for reconnaissance and surveillance are proposed in this paper, which ensures every point on the target ground area can be seen at least once in a complete surveillance circle. Moreover, the geometrically complex environments with occlusions are considered in our research. Compared with many existing methods, we decompose this problem into a waypoint-determination problem and an instance of the traveling-salesman problem.

China's defense white papers have long been dismissed as lacking substance and offering little useful information on China's real strategic intentions and military capabilities. Nevertheless, since 1998 Beijing has continued to issue defense white papers on a regular two-year frequency. Indeed, in recent years it has accorded greater importance to these documents. This paper argues that China's defense white papers warrant more attention than they have received so far. An examination of the making of the white papers, the functions designated for these documents and their evolving content and structure reveals not only the different nature and purpose of the Chinese white papers compared with their counterparts in Western countries, but also important changes and continuities in China's strategic outlook and its evolving perceptions of the role of the use of force in the context of the country's re-emergence as a major player in international affairs. (J Contemp China/GIGA)