基于Web日志粒度化的深网数据库分类

Interuet上有大量的页面是由后台数据库动态产生的,传统的搜索引擎搜索不出这部分页面,我们称之为深网,其中大部分深网信息是结构化的。将这些结构化的深网数据库按所属领域进行分类是获得深网信息的一个关键问题。本文针对已有深网数据库分类方法实现成本高昂、效率低下的问题,提出了一种基于Web日志粒度化的深网数据库分类算法,并通过实验检验了方法的分类效果。     

Developing Web Databases for Aboriginal Language Preservation

This article discusses the development of integrated multilingualWeb databases to help the preservation of the Native Americanlanguage East Cree. The creation of digital online resourcesfor threatened aboriginal languages presents many technical,educational and ethical challenges. We focus here on the technicalchallenges in order to discuss both the problems encounteredin this particular context, and the solutions we have consideredand explored. We illustrate our discussion with examples froman Oral Stories Database we developed in collaboration withCree education consultants and speakers in 2002–04. Weadvocate an approach that includes fast-prototyping, open-sourcedevelopment, and design for the database engine that balancesspeed, availability, features, and resources. We discuss theimpact the combination of this technical approach and the participatoryaction research method is having on language maintenance.     

Web数据库在制造业远程服务系统中的应用

Ｗｅｂ技术加速了全球网络化和信息化的进程,Ｗｅｂ与数据库的结合成为远程服务系统开发中的一个创新领域。本文首先概述了制造业远程服务系统开发中建立Ｗｅｂ数据库的重要性及优点,然后分析了Ｗｅｂ数据库的设计实现给出了应用实例。     

Databases to the Web: From Static to Dynamic on the Express

SUMMARY

The need to deliver current data on periodical holdings and electronic resources led the staff at Kennesaw State University's Sturgis Library to develop database-driven dynamic Web pages. The project's success was based on the incorporation of skills, technologies and hardware that were already in place in the library with Allaire's ColdFusion Express, a free, feature-limited version of ColdFusion Web application server.     

Discovering Interesting Relationships among Deep Web Databases: A Source-Biased Approach

The escalation of deep web databases has been phenomenal over the last decade, spawning a growing interest in automated discovery of interesting relationships among available deep web databases. Unlike the “surface” web of static pages, these deep web databases provide data through a web-based query interface and account for a huge portion of all web content. This paper presents a novel source-biased approach to efficiently discover interesting relationships among web-enabled databases on the deep web. Our approach supports a relationship-centric view over a collection of deep web databases through source-biased database analysis and exploration. Our source-biased approach has three unique features: First, we develop source-biased probing techniques, which allow us to determine in very few interactions whether a target database is relevant to the source database by probing the target with very precise probes. Second, we introduce source-biased relevance metrics to evaluate the relevance of deep web databases discovered, to identify interesting types of source-biased relationships for a collection of deep web databases, and to rank them accordingly. The source-biased relationships discovered not only present value-added metadata for each deep web database but can also provide direct support for personalized relationship-centric queries. Third, but not least, we also develop a performance optimization using source-biased probing with focal terms to further improve the effectiveness of the basic source-biased model. A prototype system is designed for crawling, probing, and supporting relationship-centric queries over deep web databases using the source-biased approach. Our experiments evaluate the effectiveness of the proposed source-biased analysis and discovery model, showing that the source-biased approach outperforms query-biased probing and unbiased probing.     

基于Web的矿山企业异构数据库集成系统研究

针对当前矿山企业管理信息系统中使用的大量异构数据库的特点,分析利用了异构的数据库Web集成方法。利用矿山企业已有的数据资源,设计并实现多个数据库Web集成系统。     

Pattern Databases

The efficiency of A* searching depends on the quality of the lower bound estimates of the solution cost. Pattern databases enumerate all possible subgoals required by any solution, subject to constraints on the subgoal size. Each subgoal in the database provides a tight lower bound on the cost of achieving it. For a given state in the search space, all possible subgoals are looked up in the pattern database, with the maximum cost over all lookups being the lower bound. For sliding tile puzzles, the database enumerates all possible patterns containing N tiles and, for each one, contains a lower bound on the distance to correctly move all N tiles into their correct final location. For the 15-Puzzle, iterative-deepening A* with pattern databases(N ="8) reduces the total number of nodes searched on a standard problem set of 100 positions by over 1000‐fold.     

Databases in the classroom*

Handling information on a variety of media from difference sources has always been an integral part of learning. Children now have the opportunity to use information-handling programs on microcomputers that support the existing curriculum and open up new possibilities for self-directed enquiry learning. This paper summarizes the background to the development of the QUEST ‘family’ of programs and demonstrates the way they are used in History and Geography. Comparisons are also made with other database programs.     

Context-Aware Fuzzy Databases

The development of mechanisms to ease human machine interaction is an issue about which there is increasing interest within both the software world in general, and database systems in particular. A way to tackle this problem is to try to approach the natural way of user expression. The Fuzzy Sets Theory and its application to build Fuzzy Databases constitute a consolidated advance in the literature. Another way is to adapt the interaction of the system to the context where it is running. In this sense, this paper presents an approach to build a model of Fuzzy Databases that dynamically adapts to user context. In order to do this, we have studied the management of the context in Fuzzy Database applications and we propose an architecture for the development of intelligent, flexible and customized context-aware database systems. We also present a proof of concept implementation to be used with SQL:99 standard in Oracle ORDBMS. Finally, through a real application in the medical area, we demonstrate the feasibility of the proposal.     

Constraints in Databases

Recently, interest in constraints and databases has increased significantly as the databases field has started to consider broader application domains. In this short position statement, I identify some of the most promising direcrtions, in my opinion, for the use of constraints in the context of databaes management systems.     

Benchmarking Multimedia Databases

Multimedia technologies are being adopted both in the professional and commercial world with great enthusiasm. This has led to a significant interest in the research and development of multimedia databases. However, none of these efforts have really addressed the issues related to the benchmarking of multimedia databases. We analyze the problem of benchmarking multimedia databases in this paper and suggest a methodology.     

Databases are us

In the age of information overload, the primary concern for many knowledge areas becomes the organisation and retrieval of data. Artists have a unique opportunity, at this historical juncture, to play a role in the definition and design of systems of access and retrieval, and at the very least comment on the existing practices. In this article I show how some personalities have foreshadowed and indeed influenced the current practices and huge efforts in digitising our collective knowledge. This article is an effort to broadly contextualise the current atmosphere and environment that information architects are confronted with.     

增强Access数据库的安全性

探讨了如何防范他人下载Access数据库文件的内容,使得Access数据库文件变得更加安全。