网络环境下高校图书馆如何加强馆藏资源建设

根据网络环境给高校图书馆献信息资源建设工作带来的挑战，从印刷型纸质献建设、电子献资源建设、网络信息资源建设、信息资源的共享共建等方面论述了高校图书馆如何加强信息资源建设。     

国际民航组织文献的研究方法及管理实践

本文介绍了国际民航组织(ICAO)文献的内容、类型及其特征，从而提出了对国际民航组织文献进行动态管理以及检索的方法。     

AEDMS工程文件编号的生成算法

工程文件编号生成算法是国航工程文件管理系统（AEDMS）开发的难点。提出的．工程文件编号生成算法包括．工程文件流水号和改版号的指派算法与自动编排算法。前者解决了新旧系统．工程文件编号的兼容问题；后者是一种新的基于关系代数的自动编号算法，其利用元组序号，具有紧凑简单、可靠性好、可维护性好、执行效率高、适用面广的特点。实算结果和AEDMS运行实践表明，此工程文件编号生成算法是可行的。     

S-08钢真空熔模精密铸造工艺研究

通过工艺试验和系统分析,研究出一套用真空感应铸造炉生产S-08钢铸件的工艺方法,解决S—08钢真空熔模精密铸造过程中的关键工艺技术问题,使S-08钢铸造的液氧／煤油发动机低压壳体、氧主阀下壳体等关键铸件满足高压、高冲击的负荷指标。     

非线性编辑在电视节目制作中的应用

以DY-3000型非线性编辑系统的应用实践出发，论述了非线性编辑的特点及在实际工作中的应用，同时指出了它的不足及今后的发展趋势。     

Partition method for improvement of piecewise linear model with full envelope covered

Since ambient conditions vary in a wide range within the full flight envelope, the existing piecewise linear model (PLM), which is based on sea-level static condition with use of corrected parameters for other points in the flight envelope, cannot meet the accuracy for replacing the nonlinear model. To obtain more accurate linear models, a method of partitioning the flight envelope over a grid of Mach number and altitude boxes was suggested. Then, a set of linear models for a given operating condition was selected by picking the nearest (Mach number, altitude) box in the flight envelope. Through the selected set of linear models, interpolating for power level based on a weighted sum of corrected rotor speeds can obtain a linear model with acceptable accuracy. Simulation results of different points within the full flight envelope showed that the maximum error between nonlinear model and the existing PLM was more than 50%, while the maximum error between nonlinear model and the improved PLM was within 8%. It is concluded that the improved PLM performs accurately, especially under the non-standard conditions. In addition, the improved PLM can satisfy the real-time requirement better than the existing PLM.      

高效图像资源管理器的设计与实现

针对数据存储量大引起的访问广域网服务器速度慢、不能对访问的客户进行细粒度的权限控制问题,研究了B/S模式下基于.NET平台的图像资源管理器的设计和实现技术。系统综合采用权限管理模型、动态加载、文档对象模型（DOM）等技术以及非点击无刷新伸缩控制方法,实现了图像资源管理器的分权限控制、高速访问以及无刷新高效联动等操作。实验验证了方法的可行性。     

基于INTRANET的文档工作流自动处理

本文通过对典型的企业文档处理工作流的拓扑分析,抽象出两种基本模式和变形,实际业务所对应的复杂工作流可以由基本模式和其变形的组合来构造,使复杂工作流的理解简单化,结合真实的软件开发环境,对航空企业的服务通告类文档工作流应用作了实例分析。     

Aero-engine fault diagnosis applying new fast support vector algorithm

A new fast learning algorithm was presented to solve the large-scale support vector machine ( SVM ) training problem of aero-engine fault diagnosis.The relative boundary vectors ( RBVs ) instead of all the original training samples were used for the training of the binary SVM fault classifiers.This pruning strategy decreased the number of final training sample significantly and can keep classification accuracy almost invariable.Accordingly , the training time was shortened to 1 / 20compared with basic SVM classifier.Meanwhile , owing to the reduction of support vector number , the classification time was also reduced.When sample aliasing existed , the aliasing sample points which were not of the same class were eliminated before the relative boundary vectors were computed.Besides , the samples near the relative boundary vectors were selected for SVM training in order to prevent the loss of some key sample points resulted from aliasing.This can improve classification accuracy effectively.A simulation example to classify 5classes of combination fault of aero-engine gas path components was finished and the total fault classification accuracy reached 96.1%.Simulation results show that this fast learning algorithm is effective , reliable and easy to be implemented for engineering application.     

中巴地球资源卫星的文件体系及特点

介绍了资源卫星的文件体系,指出了它的特点。文章介绍了３份系统级管理文件;４份系统级技术文件;两个树状文件一工作说明树和规范树;１１份接口数据单及其它一些文件。说明了它们的用途及主要内容。这些文件可供国际合作研制卫星参考,也可供中国卫星研制汲取其长处,加强研制管理,提高研制水平和效率。