面向对象分析技术在关系型数据库设计中的应用

介绍用面向对象的分析方法来设计关系型数据库,具体描述对象关系映射为关系型数据库的方法。     

基于感兴趣区的图象近无损压缩

无损感兴趣区（Lossless Region of Interest (ROI)图象压缩方法,即在感兴趣区采用无损压缩,而在其他区域采用有损压缩,从而保证了重要信息不丢失,并尽可能提高衅象的压缩比,在整形小波变换（IWT）和嵌入式零树编码的基础上,实现了无损感兴趣区（Lossless ROI)的图象近无损压缩,并提出了一种小波变换域形状编码算法－－树映射形状编码,同时给出了算法的原理及实现,并进行了相关实验,实验结果表明,该算法能够提高压缩效率,且压缩效率取决于感兴趣区的大小以及对不感兴趣区图象的质量要求。     

一种大视景图象库的组织方法研究

针对大视景图象具有存储信息量巨大和基本构成图形有限的特点,提出了多级库的思路,用以大量压缩视景图象信息的存储容量,该多级库由图形库和多级映射库组成;同时给出图形库、映射库的构成方法及图形与地理位置间的映射关系和基本图形的提取方法。这种数据库具有查询速度快,查询准确性高、图象存储容量压缩比率大等特点,并能将1G字节图象用不到3Mbyte的空间存储。     

一种基于SAT的FPGA映射优化算法

为了提高FPGA技术映射算法的质量,提出了一种基于布尔可满足性(SAT)的算法,在实现系统功能的前提下,可以将一个子电路映射到数量最少的查看表中。通过将该算法迭代应用于已经完成映射的电路局部,在许多情况下,可以使用更少的查看表来完成。     

Mapping of user interfaces on electronic appliances

The purpose of this study was to investigate mapping of user interfaces on consumer electronic appliances. A digital clock with five different interface modes was chosen for the experiment. Forty elderly subjects (above 65 years) and 40 middle-aged subjects (45-64 years) participated in the study. Every subject had to complete three different tasks, namely time setting, alarm time setting and date setting. The researchers investigated what problems were encountered when performing these tasks and collected data such as operational time, the number of total inputs, subjective estimation and interview information. The findings of this study indicated that the interface modes had significant effects on operational time, the number of total inputs and subjective estimation. Finally, the study confirms that when the spatial relationship between buttons and display contents are clearly indicated, the operation is easier to complete.     

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。     

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.