支持OAI-PMH的元数据互操作体系结构设计与实现

随着全球数字图书馆的迅猛发展,互操作成为亟待解决的重要问题。OAI-PMH协议的制定为在元数据级别上设计实现一个统一、高效的互操作框架创造了条件。文章基于北京大学数字图书馆项目,详尽阐述了一个典型的支持OAI-PMH互操作体系结构的完整的设计与实现;不仅包括在理论上逻辑清晰的设计方案,在实现上也采用了比较成熟又兼具理论和应用前景的技术,如Java、DOM、XML、Oracle9i等。该文的工作为将来联合式数字图书馆这一发展方向做出了很好的尝试。     

X线影像采集软件的设计与实现

针对没有数字输出接口的X光机,设计了X线影像数据的采集系统,在软件上以虚拟设备驱动和多线程为主要技术提高了影像采集、与影像处理的并行性。     

基于多代理的CRM系统

介绍了多代理的概念,提出将多代理系统的目标及推理、决策、协作、规则及控制等能力运用于CRM系统,使得整个CRM系统具有自治性、自动反映性、交互性及自适应性,在此基础上给出系统模型并讨论了各模型代理间的协作问题。     

多媒体MP3音乐网上点播系统的设计与实现

文章介绍了基于B／S模式开发Web数据库管理系统的实现原理和技术，提出了多媒体MP3音乐网上点播系统的设计思想，并使用PHP MySql技术实现该系统的主要功能。     

Intelligent policy recommendations on enterprise resource planning by the use of agent technology and data mining techniques

Enterprise Resource Planning systems tend to deploy Supply Chain Management and/or Customer Relationship Management techniques, in order to successfully fuse information to customers, suppliers, manufacturers and warehouses, and therefore minimize system-wide costs while satisfying service level requirements. Although efficient, these systems are neither versatile nor adaptive, since newly discovered customer trends cannot be easily integrated with existing knowledge. Advancing on the way the above mentioned techniques apply on ERP systems, we have developed a multi-agent system that introduces adaptive intelligence as a powerful add-on for ERP software customization. The system can be thought of as a recommendation engine, which takes advantage of knowledge gained through the use of data mining techniques, and incorporates it into the resulting company selling policy. The intelligent agents of the system can be periodically retrained as new information is added to the ERP. In this paper, we present the architecture and development details of the system, and demonstrate its application on a real test case.     

Maintaining Views in Object-Relational Databases

View materialization is an important way of improving the performance of query processing. When an update occurs to the source data from which a materialized view is derived, the materialized view has to be updated so that it is consistent with the source data. This update process is called view maintenance. The incremental method of view maintenance, which computes the new view using the old view and the update to the source data, is widely preferred to full view recomputation when the update is small in size. In this paper we investigate how to incrementally maintain views in object-relational (OR) databases. The investigation focuses on maintaining views defined in OR-SQL, a language containing the features of object referencing, inheritance, collection, and aggregate functions including user-defined set aggregate functions. We propose an architecture and algorithms for incremental OR viewmaintenance. We implement all algorithms and analyze the performance of them in comparison with full view recomputation. The analysis shows that the algorithms significantly reduce the cost of updating a vieww hen the size of an update to the source data is relatively small. Received 23 May 2000 / Revised 27 March 2001 / Accepted in revised form 30 April 2001 Correspondence and offprint requests to: Jixue Liu, School of Computer and Information Science, University of South Australia, Mawson Lakes, Adelaide SA5084, Australia. Email: jixue.liu@unisa.edu.auau     

Discovery of a perceptual distance function for measuring image similarity

For more than a decade, researchers have actively explored the area of image/video analysis and retrieval. Yet one fundamental problem remains largely unsolved: how to measure perceptual similarity between two objects. For this purpose, most researchers employ a Minkowski-type metric. Unfortunately, the Minkowski metric does not reliably find similarities in objects that are obviously alike. Through mining a large set of visual data, our team has discovered a perceptual distance function. We call the discovered function the dynamic partial function (DPF). When we empirically compare DPF to Minkowski-type distance functions in image retrieval and in video shot-transition detection using our image features, DPF performs significantly better. The effectiveness of DPF can be explained by similarity theories in cognitive psychology.     

一种分布式DIS数据库的设计

该文通过分析DIS数据管理的特点和实时性要求，论述了分布式数据库在DIS中应用的必要性，并结合水中目标对抗数据库建设中的实际工作，提出了一种分布式DIS数据库的设计和实现方法。     

军用仿真领域分布式数据管理与共享技术研究

军用仿真领域内的建模与仿真工作常常需要大量的各种类型的数据来进行建模、训练、评估等工作，但是目前各数据源分散和孤立的状态导致了用户无法快速高效地查询和获取所需的数据和信息。该文提出了一种在军用建模与仿真领域内建立大范围分布数据的管理与共享系统的思路，给出了系统的目的、任务、体系结构、各部分组成及功能，并对涉及到的关键技术进行了讨论。     

基于DM的入侵检测系统模型研究

通过研究数据挖掘技术在入侵检测系统中的应用。提出了一个基于数据挖掘的入侵检测系统的模型。