Research On Mulitimedia Web Couses And Tools Based On Knowledge System

With the development of Internet, network education has become a hot spot in modern education. Multimedia courseware determines the quality of web courses, and web course determines the quality of e-Learning, so it is very important to research on high quality web courses and courseware authoring tools.There are four research aspects:1. The paper constructs multimedia web course model. The paper uses knowledge ontology to construct semantic relation between web courses and learning resources, solve heterogeneous and disorder issues of massive learning resources. The paper proposes web course model based on knowledge system called three level'learning resources-knowledge ontology-web course'.2. The paper makes web course technology specification. There existed e-Learning standards like SCORM or CELTS, but lack of detailed specification about web courses, especially technology and sample web courses. The paper proposes web course technology specification which includes learning resources specification based on knowledge point, web course and knowledge association, research specification, manage specification and assess specification.3. There are kinds of courseware making tools based on different standards and formats, but the courseware products are difficult to extract data or convert formats with each other, which cause repeating development and serious waste of information resources.To solve the above problems, this paper does a research on an XML-based standard courseware building system MCAT. It takes CELTS as standard to define courseware elements, describes courseware using XML format, and importantly, supports to transform PowerPoint into MCAT files, thus achieving the reusability of educational resources.4. At present, there is a wide range of software tools to create triple-screen courseware, but both of teaching stream and content stream of the produced courseware still only adopt video streams to demonstrate, such transmission on the net work will occupy a larger bandwidth, which impacts the experiences of learners.The paper designed and developed Record Tool useing PowerPoint webpages to generate three-screen courseware and provides edit functions like splitting, script editing, so the courseware need much low bandwidth and keep good quality.There are three creative points:1. The paper adds knowledge ontology between knowledge system and learning resources, construct three-level model called'learning resources-knowledge ontology-web courses', realize knowledge association and resource share.2. The paper makes technology specification about web courses around knowledge point. The web course technology specification includes learning resources specification based on knowledge point, web course and knowledge association, research specification, manage specification and assess specification.3. The paper shows a method to record and make streaming media courseware, especially three-screen courseware by PPT text streaming not video streaming or picture streaming. The method makes three-screen courseware have clear quality and small data size. The courseware can be played by IE while no internet connection and we don't need courseware player.