Many researches and experiments have shown that delay-based congestion avoidance (DCA) algorithms improve TCP throughputs. However, many factors affect the veracity of DCA algorithms. In order to solve these problems, a fuzzy control based on DCA algorithms (FDCA) is proposed which eliminates these negative influences when gauging network congestion conditions. The performance of the algorithm has been tested and evaluated using NS simulator and the simulation results have demonstrated that the algorithm identifies network congestions more accurately and consequently increases network throughputs.

With the extensive application of GIS, MapX has become the focus of research on its advantages of convenient and powerful, and the contour line synthesis algorithm is one of the research. This article is focuses on the contour based on MapX synthesis algorithm in Microsoft VC++ implementation in accordance with construction TIN, contour tracking, smooth contours by using the MapX control, manual removal of the TIN network structure edge of the triangle to draw smoothness, accurate, aesthetically pleasing contour. In this paper, the experimental results of the analysis and comparison, not only to ensure the accuracy of drawing analysis, but also greatly shorten the drawing and analysis time.In addition the technology can also be used for the environment, resources, weather and other related fields.

Based on the airborne LiDAR data from Jiyuan test area, this paper studies the technical scheme and operation flow of the all - digital photogrammetry workstation VirtuoZo, which is used to rapidly produce and update geo-information data DOM for surveying and mapping. It provides the technical support for the production standard formulation of the geographic information.