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- W260289828 abstract "This paper presents two cases of the use of a World Wide Web-based system designed to support online educational procedures. The system presented, called DVT (Dynamic Virtual Trainer), consists of one or more server machines that store structured educational material in the form of autonomous units that may be accessed, combined, and presented to the user according to user-defined criteria or choices. In order to demonstrate the system, two educational packages (multimedia corpora) were developed. The first package includes educational material on telecommunications technologies. The second package includes educational material on Mount Athos. (MES) Reproductions supplied by EDRS are the best that can be made from the original document. PERMISSION TO REPRODUCE AND DISSEMINATE THIS MATERIAL HAS BEEN GRANTED BY G.H. Marks TO THE EDUCATIONAL RESOURCES INFORMATION CENTER (ERIC) 1203 Development of two Multimedia Corpora for Adaptive Web-based Distance Learning Evangelos V. Kopsacheilis Emedia EVK Ltd. Greece Email: info@emediagr ABSTRACT: The use of web-based applications for accessing structured educational material is one of the most interesting variations of Distance Learning due to its flexibility and its reduced cost. In this paper we present two cases on the usage of a web-based system designed to support on line educational procedures. The presented system, called DVT (Dynamic Virtual Trainer), consists of one or more server machines which store strict red educational material in the form of autonomous units which may accessed, combined and presented to the user according to user-defined criteria or choices. In order to demonstrate the system, we developed two educational packages. The first package includes educational material on Telecommunication technologies. The second package includes educational material on Mount Athos. The use of web-based applications for accessing structured educational material is one of the most interesting variations of Distance Learning due to its flexibility and its reduced cost. In this paper we present two cases on the usage of a web-based system designed to support on line educational procedures. The presented system, called DVT (Dynamic Virtual Trainer), consists of one or more server machines which store strict red educational material in the form of autonomous units which may accessed, combined and presented to the user according to user-defined criteria or choices. In order to demonstrate the system, we developed two educational packages. The first package includes educational material on Telecommunication technologies. The second package includes educational material on Mount Athos. Introduction In the context of Distance Learning a critical factor for the success of a specific course is the possibility of the students for accessing interactive educational resources such as animated presentations, multimedia libraries, etc. Students tend to learn more in classes in which they receive computer-based instruction supported by interactive educational information packages (Kuperstein et al. 1999). The design, development and delivery of such educational resources usually require significant effort to be spent by the teacher or the producer of the electronic educational material. In addition, a teacher should have considerable experience in computers and web authoring in order to produce a multimedia course tailored to the specific needs of a class or the needs of a geographically dispersed group of students. The problem of time consuming development of electronic educational resources may be faced through the use of flexible tools for the composition of electronic educational material. Using these kind of tools a teacher could easily create, enrich and maintain a body of electronic educational resources without the need of extended skills on computers and web authoring. As a result, the usage of such flexible tools may promote the introduction of information technologies in the day-to-day teaching practice. In this paper we present a flexible architecture called DVT which stands for Dynamic Virtual Trainer (Kopsacheilis et al. 1999). We also demonstrate its use in developing two educational packages (multimedia corpora) on different subjects. The proposed architecture allows the dynamic composition of online lessons based on the combination of educational units according to varying user needs. The educational units are short composite entities of a variety of types like modules in HTML (HyperText Markup Language), virtual reality representations in VRML (Virtual Reality Markup Language), text, audio and video clips, etc. (Minoli & Keinath 1994). The dynamic composition of the lessons may be guided either by user defined search criteria or by other types of parameters like the desired level of lesson details, the level of relevance to other topics, etc. A Flexible Development Platform DVT is based on one or more servers who store the educational entities. The users are connected to the server through a common Internet browser and they have access to the introductory web pages of the server. The most important feature of these pages is the possibility for tailoringthe lesson to be presented through the selection of the focal points of the discussion, the analytical level of the lesson, the levels of accompanying information, etc. The user may select one or more predefined lessons out of a menu. A much BEST COPY AVAILABLE 2 U.S. DEPARTMENT OF EDUCATION Office of Educational Research and Improvement EDUCATIONAL RESOURCES INFORMATION CENTER (ERIC) it This document has been reproduced as received from the person or organization originating it. 0 Minor changes have been made to improve reproduction quality. Points of view or opinions stated in this document do not necessarily represent official OERI position or policy. more dynamic possibility is the real time composition of a lesson according to criteria entered by the user. The user may also use a set of questionnaires that accompanying the lesson's elements in order to self evaluate the educational procedure. The questionnaires are highly configurable (simple true-false answers, multiple choices, etc.). In addition a questionnaire may be easily formed to support the user providing tips, summarized information, etc. DVT uses the Internet-Intranet communication technologies for the distribution of the lesson (Halsall 1995). The entire architecture is supported by a DataBase, which keeps the relations between the elements of the educational material. The educational material stored in the server has the form of simple and short packages of information describing a specific topic, which are called Information blocks (His). An lB may include HTML pages, VRML representations, text, audio or video clips or a combination of the above components. Each lB corresponds to a set of parameters called Connectivity Block (CB) which supports the dynamic composition of the lessons. These parameters are used by the DVT Data Base in order to combine each IB with other relevant lBs or in order to combine the 1B with a questionnaire. Finally the CBs include a set of key words which are used to select the specific lB each time the user enters one of the specific key words. A group of lBs forms a Chapter. A Chapter is focused on a set of relevant topics. A group of Chapters forms a Book. A Book covers a wider group of topics. This structure is depicted in Figure 1." @default.
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