Object-oriented DBMS requirements

The requirements on an object-oriented DBMS for management of information in a large, complex enterprise are presented. These requirements aid in the achievement of an environment characterized by data sharing, open architectures, application and data portability, and assurance of data integrity. They were defined from the point of view of a user of the DBMS; therefore they describe the expected functionality of the DBMS and do not specify the method of implementation to achieve this functionality. They encompass requirements on the data model, query and data manipulation languages, the system architecure, interfaces to the system, change management, and transaction management.     

现代远程协作学习系统的设计与实现

目前的远程教学中主要依赖的信息共享、个体学习、有限交互的模式,已经不能满足学习者对学习质量越来越高的期望。在此,提出一个协作学习模型。这种协作方式可以使学生在信息交流的过程中,更好地了解他人的观点、方法和建议,促进自己的学习。同时,这种模型也为基于Web的信息交流提供新的协作方式。     

基于智能客户端的巡检系统设计与实现

针对健康检查中心医生外出进行健康检查作业时,健康检查系统无法离线使用的问题,本文应用智能客户端技术构建巡检系统。该巡检系统可以在离线状态完成健检系统功能,待系统连线以后,通过调用Web Service访问健康检查中心数据库进行数据上传和下载。对系统进行总体设计,给出体系结构图,并且详细介绍相关技术及实现。     

Web proxy cache replacement scheme based on back-propagation neural network

Web proxy caches are used to reduce the strain of contemporary web traffic on web servers and network bandwidth providers. In this research, a novel approach to web proxy cache replacement which utilizes neural networks for replacement decisions is developed and analyzed. Neural networks are trained to classify cacheable objects from real world data sets using information known to be important in web proxy caching, such as frequency and recency. Correct classification ratios between 0.85 and 0.88 are obtained both for data used for training and data not used for training. Our approach is compared with Least Recently Used (LRU), Least Frequently Used (LFU) and the optimal case which always rates an object with the number of future requests. Performance is evaluated in simulation for various neural network structures and cache conditions. The final neural networks achieve hit rates that are 86.60% of the optimal in the worst case and 100% of the optimal in the best case. Byte-hit rates are 93.36% of the optimal in the worst case and 99.92% of the optimal in the best case. We examine the input-to-output mappings of individual neural networks and analyze the resulting caching strategy with respect to specific cache conditions.     

基于Domino的办公平台Web应用改造

浏览器以B/S的访问方式可以有效地提高用户访问速度,解决远程和移动办公效率问题.中国海油对Domino办公平台进行了Web应用改造.本文介绍了Web办公信息门户设计,对Web办公信息门户的总体框架、动态站点生成工具Indi.SiteMaster、Web系统身份验证接13和管理程序、应用模块的Web改造、Web首页设计做了阐述,并简述了办公平台Web应用改造的效果、存在的问题与展望.     

FlashPaper在网络课程制作中的应用

随着网络课程数量的日益增多,在网络课程制作中使用FlashPaper技术也越来越常见。文章首先介绍了FlahshPaper软件的工作原理的,其次重点介绍了该软件的使用方法和步骤,并总结出了使用FlashPaper技术在网络课程页面呈现中所体现出的优越性。     

Global Interoperability Using Semantics, Standards, Science and Technology (GIST)

“Global Interoperability Using Semantics, Standards, Science and Technology” is a concept that is predicated on the assumption that the semantic integration, frameworks and standards that support information exchange, and advances in science and technology can enable information-systems interoperability for many diverse users. This paper recommends technologies and approaches for enabling interoperability across a wide spectrum of political, geographical, and organizational levels, e.g. coalition, federal, state, tribal, regional, non government, and private. These recommendations represent steps toward the goal of the Semantic Web, where computers understand information on web sites through knowledge representations, agents, and ontologies.     

论数字图书馆系统中WEB服务器性能优化的方法

由于在数字图书馆系统中流通着的大多是数字化的索引、文摘、全文、图像或音频视频等多媒体信息,对Web服务器性能有着较高的要求.结合实际工程的经验,从硬件实现手段(缓存服务器、均衡负载设备、Web双机镜像等)和软件实现手段(多层软件结构设计、应用部署等)等两个大方面论述如何提高Web服务器性能,以便使用户能够更快捷、高效、安全地使用数字图书馆应用系统.     

浅谈高校教学软件用服务器的复用技术

根据国家相关部门的要求,财经类高校实践教学所占的比例逐步增加,财经类高校特有的实践教学模式,决定了实践教学多采用软件模拟的方式进行。采用软件模拟的方式,要求有大量的服务器用于支撑教学软件的运行。受到资金投入和机房场地等因素的制约,教学软件用服务器的数量总是不能满足需求,从而影响实践教学的开展。结合财经类高校实践教学软件特有的使用规律,提出使用服务器复用技术,解决因服务器数量上不足影响实践教学顺利进行的问题,从而更好的服务实践教学。