交通科技项目查新检索系统的设计与实现

讨论了科技查新工作的目的及在交通行业中查新检索的必要性、特点和检索技巧,并以交通科技查新工作的实践经验为依托,从技术先进性和实用性出发,开发了交通科技项目查新检索系统。介绍了系统的开发背景、技术路线、功能模块等特点。通过交通查新检索系统的应用,极大地提高了查新工作的效率与管理水平,减少了科研项目低水平重复和科技成果评审失准。     

基于协同共享理念的汽车文献与情报资源服务平台开发

介绍了以＂协同、共享＂理念为宗旨,以多年积累的科技信息资源以及情报部门第一手情报研究资料为基础,以实现信息资源共享为目标而开发设计的＂汽车文献信息与情报资源共享平台＂。该平台开发了基于＂领域本体＂概念的汽车专业标引检索体系,首次实现了企业和本地高校资源的同平台发布和共享,实现了异构库跨库检索功能。该平台的开发应用将为推动企业技术创新、科学决策和人才培养提供重要的支持和保障作用。     

汽车信息资源的有效利用

分析了各种载体的汽车信息资源的种类和分布特点,并系统地介绍了汽车信息查询的途径和利用方法,为汽车业人员有效利用信息资源提供了建议和指导。     

关于数据仓库中编码位图索引的研究

引入一种新的索引技术-编码位图索引,介绍它的基本思想及其维护方法,并列举了它在数据仓库中的几种典型应用.其中编码位图索引,能较好地提高数据仓库的查询效率.     

国内实用网络文献检索系统

简要介绍和评价了目前国内几个实用的网络文献检索系统:CNKI中国知网、万方数据资源系统、中国科技图书文献中心网和天元数据网,为在实际工作中选择适当的检索工具提高文献检索的效率和质量提出了很好的建议.     

Spectrum Feature Retrieval and Comparison of Remote Sensing Images Using Improved ISODATA Algorithm

Due to the large quantities of data and high relativity of the spectra of remote sensing images, K-L transformation is used to eliminate the relativity. An improved ISODATA (Interative Self-Organizing Data Analysis Technique A) algorithm is used to extract the spectrum features of the images. The computation is greatly reduced and the dynamic arguments are realized. The comparison of features between two images is carried out, and good results are achieved in simulation.     

Dynamic response analysis of towed cable during deployment/retrieval

A numerical approach was developed to analyze the transient behavior of towed cable during ac- tively controlled deployment/retrieval (DR). The cable motion is described by the lumped parameter method, its corresponding boundary conditions are presented. In view of its varying length during DR, two auxiliary arguments are introduced to describe its continuous varying length and discrete number of nodes(equations), the length is determined by the pay out(or reel-in) rate, which is then used to determine the node number by a logic relation. For the discrete mathematical model of towed cable, an algorithm was developed to deal with the discrete governing equations. The simulation results indicate that the cable experiences more com- plex motions due to its varying length, and tension fluctuates seriously in the startup and ending stage of deployment/retrieval. The effect of towing ship's motion in waves on cable during deployment/retrieval is also considered via numerical simulation.