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，虽然互联网是一个拥抱捆绑的数据，类似于数据库，数据格式过于多样化的数据库一样的使用。因此，很难有效地利用它们。本研究取得了以下三个方面的贡献：（1）地方互联网的分析与应用本研究与京都周边用户众多的ISP（Kyoto-Inet）合作，提出了在互联网上检索地方信息的方法。特别是，它主要包括两个建议;计算方法的信息是如何强烈的本地区域，和缓存技术的网页访问频繁。在后者中，我们表明，它是实际有用的，通过应用该方法的真实的数据的ISP。(2)利用万维网进行高级教育由于万维网有助于实现远程学习系统，我们实践并评估了我们的长期研究提案。与京都教育委员会合作，将该系统应用于Horikawa高中的数学课程。我们在高仓县和五所南小学实施了鼓励提高学生创造力的教育活动。我们对构建学生理解过程数据库进行了研究。这些制度各不相同，但至今仍在实行.由于教师和学生的支持，该系统正在得到普及。(3)电子商务数据库技术（E-Commerc）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中获得的项目。对企业间XML文档的兼容性进行了理论研究。在电子商务中，由于商品容易被复制，版权保护比在真实的商业活动中更为重要。它与Woodland、ASTEM和京都比较法中心合作，为电子商务技术开发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.