项目CAID装饰设计子系统的研究与应用*

阐述了装饰设计在产品设计中的作用及计算机辅助装饰设计的类型。针对不同的装饰类型提出了不同的解决方案;对于色带装饰采用基于纹理映射的方法;对于标志装饰,提出了非矩形贴图算法。自行开发了CAID软件系统中的装饰设计子系统。经实际应用证明,该系统可有效地辅助工业设计师进行装饰设计。     

灰度图像增强算法的改进与实现研究

分析了传统灰度图像直方图均衡化算法的不足,讨论并实现了一种改进的直方图均衡化图像增强算法。该算法与传统的算法相比,给出了合适的映射关系,运算效果有很大改善,减少了图像信息的丢失,特别是对于质量较差的原始图像,采用该算法进行图像增强处理时,也可以取得较好的效果。     

基于寻优算法的改进自组织映射研究

为加快自组织映射的学习速度,提出一个改进的自组织映射(SOM)算法。该算法将类似模拟退火过程应用于SOM学习算法中,动态调整学习参数来优化神经元的运动,并且在损耗值达到一定阈值的情况下提前停止自组织映射聚类,保证输入数据与映射规则的快速学习与较好性能。在提高学习速度的前提下,达到输入到输出的图形一致性。在不同大容量数据集的测试结果表明,该算法与原始SOM算法及其改进算法相比,在收敛速度上可以提高一倍左右,精度上较标准SOM提高50%左右。     

仿生机器人视觉导航研究分析

视觉导航技术是保证机器人自主移动的关键技术之一。为了从整体上把握当前国际上最新的视觉导航研究动态,全面评述了仿生机器人视觉导航技术的研究进展,重点分析了视觉SLAM(Simultaneous Local-ization and Mapping)、闭环探测、视觉返家三个关键问题的研究现状及存在的问题。提出了一个新的视觉SLAM算法框架,给出了待解决的关键理论问题,并对视觉导航技术发展的难点及未来趋势进行了总结。     

LISP-HIMS:一种基于LISP的层次化标识映射系统

针对目前全球路由表规模高速增长的问题,IETF提出可以通过分离主机的身份标识和路由标识地址空间来重新考量互联网寻址体系结构。思科公司提出的LISP(Locator Identity Separation Protocol)是基于该思想提出的主流方案之一。首先提出一种新的基于LISP的层次化标识映射系统,以克服目前其他LISP映射系统的不足,然后详细阐述该系统的模型、工作模式以及主机身份标识的分配方案;最后与其他LISP映射系统进行了分析与比较,结果表明,该系统具有良好的可扩展性以及更低的映射信息查询时延。     

Consideration of the errors inherent in mapping historical glacier positions in Austria from the ground and space (1893-2001)

The historical record of in situ measurements of the terminus positions of the Pasterze and Kleines Fleißkees glaciers in the eastern Alps of Austria is used to assess uncertainties in the measurement of decadal scale changes using satellite data. Topographic maps beginning in 1893, and satellite data from 1976 to 2001, were studied in concert with ground measurements to measure glacier changes. Ground measurements show that the tongue of the Pasterze Glacier receded ∼1150 m from 1893 to 2001, while satellite-derived measurements, using August 2001 Landsat Enhanced Thematic Mapper Plus (ETM+) data registered to an 1893 topographic map, show a recession of 1300-1800 m, with an unknown error. The measurement accuracy depends on the registration technique and the pixel resolution of the sensor when two satellite images are used. When using topographic maps, an additional source of error is the accuracy of the glacier position shown on the map. Between 1976 and 2001, Landsat-derived measurements show a recession of the terminus of the Pasterze Glacier of 479±136 m (at an average rate of 19.1 m a⁻¹) while measurements from the ground showed a recession of 428 m (at an average rate of 17.1 m a⁻¹). Four-meter resolution Ikonos satellite images from 2000 and 2001 reveal a shrinkage of 22,096±46 m² in the Pasterze tongue. The nearby Kleines Fleißkees glacier lost 30% of its area between 1984 and 2001, and the area of exposed ice increased by 0.44±0.0023 km², according to Landsat satellite measurements. As more recent satellite images are utilized, especially data that are geocoded, the uncertainty associated with measuring glacier changes has decreased. It is not possible to assess the uncertainty when an old topographic map and a satellite image are coregistered.     

虚拟地形建模及运动目标实时监测的研究

随着虚拟现实技术、3S技术、网络技术的发展,地形三维可视化和目标监测等方面已成为研究的热点。该文结合开发的应用系统论述了实现地球三维可视化的建模方法,以及Internet环境下在三维虚拟地形上实现目标监测的技术。     

基于三角形对应关系的Morphing技术

基于图象生成的真实感图象有着不依赖于场景复杂度的突出优势。文中提出了一种基于三角形特征对应的Ｍｏｒｐｈｉｎｇ方法，它对局部信息进行综合，可以获得比传统的基于线段特征方法更快的处理速度，同时不会由于全局信息的影响而造成图象的扭曲失真     

基于Java技术的WebGIS框架研究

本文力图把当前软件开发技术和Java技术领域中逐渐成熟的设计模式和方法,引入到WebGIS基础开发框架的设计中,以提高框架的可设计性和简化应用开发;表现层中引入MVC模式,数据访问层使用对象一关系映射技术,逻辑层提供有关空间操作的Java APIs(Java Application Program-ming Interface).以此作为框架的基本组成单元.基于Java平台对这个框架的原型进行了实现。以期能为WebGIS框架设计提供一个有意义的参考实现。     

Experimental evaluation of plowing and scratch hardness of aqueous two-component polyurethane (2K-PUR) coatings on glass and polycarbonate

Scratch resistance of aqueous two-component (2K-PUR) polyurethane coatings deposited on glass and polycarbonate was investigated by constant mode scratch tests. Penetration and residual depths as well as scratch widths were experimentally evaluated. A first analytical model was applied to estimate plowing and scratch hardness of the polyurethane coatings according to contact pressure and load rate and the corresponding 3D maps were drawn out. The experimental findings allowed mapping the scratch response the polyurethane coatings came through varying the applied load, load rate and substrate compliance, thus establishing the basis for the development of useful tools for failure prediction of the investigated coating systems in a broad range of operational conditions.