基于城镇地籍数据三维建模的城镇低效用地调查研究

［目的］文章以江西省某县中心城区为例,利用城镇地籍数据构建一种快速调查低效用地的方法,为实现城镇用地粗放低效利用向精明高效利用转变。［方法］首先根据建筑物三维属性开展城镇三维建模; 然后结合GIS三维可视化、空间分析等方法识别低效用地; 最后采用单因子评价法进行低效用地类型判定。［结果］（1）Ⅰ类低效用地的分布与城镇建设程度有关,主要分布在建设程度弱的区域; （2）Ⅱ类低效用地受布局混乱影响,造成周边建设用地割裂,影响土地的综合利用; （3）Ⅲ类低效用地大部分远离城镇中心区域,“粗放式”的土地利用模式导致土地利用强度不达标。［结论］盘活城镇低效用地是现实需要,基于城镇地籍数据三维建模的低效用地调查方法,减少了内、外业工作量,提高了调查效率与可视化程度,为城镇低效用地调查提供一种新技术与方法,有助于增强城镇核心功能,实现土地集约节约利用。     

基于回归神经网络的雷达辐射源识别算法

本文在研究带偏差单元内部回归神经网络（Internally Recurrent Net，IRN）算法的基础上，分析了雷达特征参数和雷达威胁类型的内在联系；利用统计分析和特征建模的方法获取先验知识、设计分类器并求取模糊隶属函数，结合IRN自学习特性和模糊隶属函数的分类功能识别出目标雷达辐射源可能的威胁类型，给出识别可信度。     

新一代导航数据库规范

为了加强机载设备间导航数据的交换和共享,简化有混合机队的航空公司与航空电子设备供应商处理导航数据库包的过程,通过绘制逻辑关系图对新一代导航数据库规范ARINC 424A记录布局,输出格式,数据链形式,文档结构方面进行研究,应用UML模型描述机载导航数据库,用XML构建交换模型实现不同来源数据无缝集成。表明ARINC424A满足民航运输对机载导航数据库提出的航空信息及时性,准确性,数据完整性的新要求。     

Den egna vägen: Sverige och den europeiska integrationen 1961–1971

Abstract

The use of armaments, diplomacy and economic pressure to intervene in the functioning of an enemy economy has been one of the most disputed concepts of warfare in the twentieth century. In the war against Germany after 1939 so called ‘economic warfare’ proved on the whole a poor investment of Allied resources with the notable exception of the bombing raids on synthetic oil factories. By contrast it was eminently successful in the campaigns against Japan. One obvious reason for the difference is that Japan was an island power against which the traditional techniques of naval blockade were effective whereas Germany by her territorial conquests on the continent was able greatly to extend her control over economic resources despite the blockade. But there were other reasons for the relative failure of ‘economic warfare’ against Germany and these, like the results of conquest, are central to these two works. One was that the complexity of the German economy in its international setting, combined with the difficulty of obtaining accurate economic information about an enemy economy during a war, meant that there was in reality no method of selecting with an accuracy sufficient to justify the deployment of large resources a link in the chain of production so weak that it could be destroyed. Secondly, a lurking suspicion that this might be so caused rapid changes in strategy, so that when weak links were identified the targets were seldom attacked for long enough for the strategy to succeed. Thirdly, the weapons and techniques of intervention in an enemy economy were seldom perfect enough to achieve their ambitious purpose. And finally German foreign trade even in strategic commodities survived because it was also in the interests of neutrals, and even in those of the Allies where their own economic relationship with the neutrals was concerned, that it should.     

云背景下的数据库安全性研究

随着云技术飞速发展,云安全体系也要相应地发展,使得我们可以更快更好地进入云的世界。云计算带来的数据安全问题值得世界各国关注。本文从云背景下的数据库安全性出发,探讨了实现数据库安全的技术与方法。     

局部腐蚀案例库的设计与实现

设计与实现了一个局部腐蚀案例库。该系统包括大量的局部腐蚀失效案例库,案例的浏览、添加、修改、查询等多项管理的功能模块,以及方便、全面的帮助模块。     

Relationship Marketing and Sustained Competitive Advantage

This paper examines four perspectives of relationshipmarketing that have been discussed in the marketing literaturein recent years and which are being touted as sources of long-termprofitability for organizations. We examine each of the fourperspectives (locking in customers, customer retention, databasemarketing, and building strong, close, positive relationships)to assess their potential for achieving a sustained competitiveadvantage. Our analysis suggests that only those organizationsthat build strong, close, positive relationships with their customershave the potential to develop a sustained competitive advantagethat may lead to above normal performance.     

浅谈数据库原理教学方法

在阐述该课程积极性的基础上,提出了重视数据库原理理论教学与实际数据库的操作结合,在“听课”与“实验”的教学环节间增加“自学”环节,利用现代化教学技术CAI,提高教学质量和教学效率,走近学生,了解学生的学习困难,注重课堂教学的互动性等观点。     

科技项目评审专家库建设研究

在日益增多的科技项目评审活动中,专家库建设发挥着重要作用.介绍了国内专家库建设及研究现状,分析了苏州科技项目评审专家库建设情况及存在问题,并对下一步专家库的建设提出了建议.     

学生管理系统的设计与实现

管理信息系统是一个复杂的人机系统,学生管理信息系统近几年来也有了长足的发展。本文将以一个典型的学校中的学生信息管理系统为例子,来讲述如何建立一个学生信息管理系统。