Image reconstruction by adaptive bayesian classification with a locally proportional prior

This paper concerns the problem of reconstructing images from noisy data by means of Bayesian classification methods. In Klein and Press, 1992, the authors presented a method for reconstructing images called Adaptive Bayesian Classification (ABC). The ABC procedure was shown to preform very well in simulation experiments. The ABC procedure was multistaged; moreover, it involved selecting a prior at Stage n that was the posterior at Stage n - 1. In this paper the authors show that we can improve upon ABC for some problems by modifying the way we take the prior at each stage. The new proposal is to take the prior for the pixel label at each stage as proportional to the number of pixels with that label in a small neighborhood of the pixel. The ABC procedure with a locally proportional prior (ABC/LPP) tends to improve upon the ABC procedure for some problems because the prior in the iterative portion of ABC/LPP is contextual, while that in ABC in non- contextual.     

非线性因素对远场涡流探头特性的影响

采用线性和非线性有限元方法对带磁路和磁电组合屏蔽的远场涡流探头的信号──距离特性进行了计算机模拟，给出探头的信号──距离特性曲线。结果表明：铁磁材料的非线性因素导致激励电流密度与二次穿透区的位置直接相关联。     

Managing our urban future: the role of remote sensing and geographic information systems

Urban growth is inevitable over the next two decades. The bulk of this growth will take place in less developed countries. This presents a formidable challenge for urban planners and managers. With this in mind, this paper considers some of the ways urban planners can make use of recent developments in remote sensing and geographic information systems technology to respond to this challenge. The discussion is divided into four sections. The first of these considers the nature of the tasks involved. The second examines the potential of remote sensing and geographic information systems to assist in these tasks in general terms. The third section presents some of the findings of three case studies of contrasting application areas in the urban planning field which give some insights as to how these tools can be used to respond to this challenge. The final section rounds off the discussion with a vision of sustainable urban development and its implementation at the local level.     

浅析现代远程成人教育质量保证体系的构建

现代远程教育担负着实现高等教育普及化和大众化的任务。本文探讨了现代远程成人教育教学质量管理体系模型的建立应以多元化的质量目标体系为基础,强调在教学过程中对各个环节实施质量管理控制,并对质量监控进行评价,完善整个远程教育教学质量管理体系。     

地形图编制计算机辅助系统的研究

探讨了用遥感技术结合计算机编制地形图的原理及所涉及到的坐标变换问题从航空像片直接获取象点上标数据，经过汁算机纠正，形成地面坐标数据，再转化成CAD图形文件数据格式，输出地形图．使用该系统具有成图速度快、精度高、成本低等优点．     

流媒体及其在远程教育中的应用

流媒体文件是连续的数据流并以数据包的形式传输 ,用户不需等待下载完毕 ,便可一边下载一边播放所要点播的节目。远程教育要实现异地远程的同、异步教学 ,网络课件点播 ,网上课堂直播等都可以采用流媒体格式 ,从而能够简单有效地实现以生动的多媒体教学为主的现代远程教育