QoS路由选择:问题与解决方法综述

保证服务质量的QoS路由(Quality of Service Routing)是网络中解决QoS问题的一项关键技术.QoS路由的主要目标是为接入的业务选择满足服务质量要求的传输路径,同时保证整个网络资源的有效利用.度量参数选择问题、寻路问题和路由信息不准确问题是QoS路由中的几个主要研究内容.本文围绕这三个方面,介绍了QoS路由中的主要问题及相关的解决办法,并探讨了今后QoS路由可能的研究方向.

A Modified Interactive Segmentation of Medical Image Series

In this paper,we propose an algorithm for the semiautomatic segmentation of medical image series based on the combination of the live wire algorithm and the active contour model.We modify the traditional live wire algorithm by combining it with the region growing method and obtain accurate segmentation of one or more slices in a medical slice series by the live wire algorithm.Then the computer will segment the nearby slice using the active contour model.We introduced a gray scale model to the boundary points of the active contour model to record the local region characters of the desired object in the segmented slice and replace the external energy of the traditional active contour model with the energy decided by the gray scale model.A simple method based on the idea of the live wire algorithm is introduced for the reparation of the automatic segmentation result to guarantee the reliability of the result.Experiment shows that our algorithm can obtain the boundary of the desired object from a series of medical images quickly and reliably with only little user intervention.