Studies on Internet Database and its Applications

随着互联网的广泛使用，其应用领域也越来越广。然而，尽管互联网是一大堆数据，类似于数据库，但数据格式过于多样化，不适合数据库式的使用。因此，很难有效地利用它们。本研究主要完成了以下三个方面的工作：(1)本地互联网的分析与应用本研究与京都周边用户较多的网络服务提供商合作，提出了互联网上本地信息的检索方法。特别是，它主要由两个方案组成：信息与局部区域关联度的计算方法和频繁访问的网页缓存技术。在后者中，我们通过将该方法应用于互联网服务提供商的真实数据，证明了该方法的实用性。(2)基于WWW的高级教育有助于实现远程教育系统，我们与京都教育委员会合作，对我们长期的研究方案进行了实践和评估，并将该系统应用于Horikawa高中的数学课。我们在高仓县和高正南美小学开展了教育活动，鼓励提高学生的创造力。我们对构建学生理解过程的数据库进行了研究。这些制度与另一个制度截然不同，但现在仍在实践中。电子商务数据库技术(E-Commerce)本研究提出了统计评估的方法，以找出客户希望在电子商务系统上获得的物品。对企业间兼容的XML文档进行了理论研究。在电子商务中，著作权的保护比真实的商业活动更容易被复制。它与伍德兰、ASTEM和京都比较法中心合作，为电子商务技术发展和版权保护做出贡献。

As the use of the Internet is widespread the application area is getting wider. However, while the Internet is a hug bundle of data and is analogous to databases, the data format is too diversified for the database-like use. Hence, it is difficult to utilize them efficiently. This research has achieved the following three contributions :(1) Analysis and application of local InternetThis research proposed retrieve methods of local information on the Internet, cooperating with ISP (Kyoto-Inet) that has many users around Kyoto. Especially, it consists mainly of two proposals ; computation methods of how strongly the information is associated with the local area, and caching technologies of web pages accessed frequently. In the latter we showed that it is practically useful, by applying the method to the real data of the ISP.(2) Advanced Education with WWWSince WWW is helpful to realize distant learning systems, we practiced and evaluated our long-time research proposals Cooperating with Kyoto board of education, the systems were applied to math classes at Horikawa high school. We have practiced educational activities to encourage to improve students' creativity at Takakura and Gosho-minami grade schools. We did researches on constructing databases of students' understanding processes. These systems are distinct from on another, but are still in practice now. Because of support by the teachers and students, the systems are getting widespread.(3) Database Technologies for Electronic Commerce (E-Commerc)This research presented statistical evaluations of methods to find out the items customers hope to get on e-commerce systems. It did theoretical researches on XML documents compatible among corporations. In E-Commerce, it is more importan to protect copyrights because of easier duplication of the items than in real commercial activities. It cooperated with Woodland, ASTEM and Kyoto Comparative Law Center to contribute to EC technology development and copyright protection.