A Study on Mobile Database Systems for Cellular Phones

• Main Authors: Yung-yuan Cheng, 鄭永原
• Other Authors: Eric Jui-Lin Lu
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/6p8wz9

碩士 === 朝陽科技大學 === 資訊管理系碩士班 === 91 === Due to the popularity of electronic commerce and the maturity of wireless technology, mobile users can access Internet anytime anywhere without having to physically hook up any access point. To be able to manage and manipulate data downloaded from the Internet, there is a strong need for mobile databases for mobile devices. Therefore, in this thesis, we designed and implemented a mobile database for Java phones. XML is adopted to describe the data. In addition, XSLT is used to describe processing rules so that the processor does not have to be re-designed whenever processing rules are changed. Due to mobile device’s constraints such as limited memory and small screen, the retrieved data should be small and accurate. Therefore, we designed a mediator based on ontology and RDF/RDF Schema in the server side. The mediator contains a ontology repository. The ontology repository contains a domain ontology and a task ontology. We use ontology to describe database’s schema. In addition, vocabulary and functions in domain knowledge are described by ontology. RDF/RDF Schema is adopted to describe ontology. Therefore the mediator can cooperate with databases to provide small and accurate date for mobile users.